阅读说明：本技术 具有噪声吸收器的车辆充气轮胎以及用于将至少一个噪声吸收器固定至车辆充气轮胎表面的粘合剂组合物 (Vehicle pneumatic tire with noise absorber and adhesive composition for securing at least one noise absorber to a surface of a vehicle pneumatic tire ) 是由 米哈伊尔·多罗申科 安德烈亚斯·季布雷斯基 乔·瓜尔达拉贝尼 马库斯·达尔克 丹尼尔·莫尔 于 2018-04-17 设计创作，主要内容包括：本发明涉及一种车辆充气轮胎,其包括粘合性地附接到在所述轮胎内部与胎面相反的内表面上的至少一个吸声器,其中该至少一个吸声器粘附到粘合剂上,并且涉及一种用于将至少一个吸声器固定至车辆充气轮胎表面的粘合剂组合物。该粘合剂含有至少以下成分：-按重量计10％至80％的至少一种橡胶,和-按重量计11％至80％的至少一种聚烯烃,和-按重量计2％至20％的至少一种烃树脂。该粘合剂具有优化的流动特征和优化的粘着性。(The present invention relates to a pneumatic vehicle tire comprising at least one sound absorber adhesively attached to the inner surface of the interior of the tire opposite the tread, wherein the at least one sound absorber is adhered to an adhesive, and to an adhesive composition for securing the at least one sound absorber to the surface of the pneumatic vehicle tire. The adhesive contains at least the following components: -from 10 to 80% by weight of at least one rubber, and-from 11 to 80% by weight of at least one polyolefin, and-from 2 to 20% by weight of at least one hydrocarbon resin. The adhesive has optimized flow characteristics and optimized tack.)

1. A pneumatic tyre for vehicles, comprising at least one sound absorber (9) adhesively attached to the inner surface of the interior of the tyre opposite to the tread (1), wherein the at least one sound absorber (9) is adhered to an adhesive (8), characterized in that the adhesive (8) contains the following constituents:

-from 10 to 80% by weight of at least one rubber, and

-11 to 80% by weight of at least one polyolefin, and

-from 2 to 20% by weight of at least one hydrocarbon resin.

2. A vehicle pneumatic tire as in claim 1, wherein the rubber is selected from the group consisting of: natural Rubber (NR), synthetic polyisoprene (IR), Butadiene Rubber (BR), styrene-butadiene rubber (SBR), butyl rubber (IIR) and halogenated butyl rubber.

3. A pneumatic tyre for vehicles as claimed in claim 1, characterized in that the adhesive contains 51% to 80% by weight of at least one butyl rubber (IIR).

4. The vehicle pneumatic tire of claim 1, wherein the adhesive contains 10% to 80% by weight of at least one rubber, wherein the rubber is selected from the group consisting of: natural Rubber (NR), synthetic polyisoprene (IR), Butadiene Rubber (BR), styrene-butadiene rubber (SBR), and halobutyl rubber.

5. A pneumatic tyre for vehicles as claimed in claim 4, characterized in that the amount of the at least one rubber is from 30% to 60% by weight, preferably from 40% to 55% by weight, particularly preferably from 45% to 50% by weight.

6. A pneumatic tyre for vehicles as claimed in claim 1, characterized in that the adhesive (8) contains 1% to 35% by weight of at least one filler.

7. A pneumatic vehicle tyre as claimed in any one of the preceding claims, characterized in that the adhesive is free of vulcanizing agents, metal oxides and peroxy compounds.

8. A pneumatic vehicle tyre as claimed in any one of the preceding claims, characterized in that the at least one polyolefin is at least one polybutene.

9. A pneumatic vehicle tyre according to any one of the preceding claims, characterized in that the at least one sound absorber (9) is at least one porous damping element.

10. A pneumatic vehicle tyre as claimed in claim 9, characterized in that the porous damping element is an acoustic foam ring which is closed or open in the circumferential direction.

11. A pneumatic vehicle tyre according to any one of the preceding claims, wherein the sound absorber comprises at least one polyurethane.

12. An adhesive composition for fixing a sound absorber (9) to the surface of a pneumatic tyre for vehicles, characterized in that it comprises at least the following components:

-from 10 to 80% by weight of at least one rubber, and

-11 to 80% by weight of at least one polyolefin, and

-from 2 to 20% by weight of at least one hydrocarbon resin.

Technical Field

The present invention relates to a pneumatic vehicle tire comprising at least one sound absorber adhesively attached to the inner surface of the interior of the tire opposite the tread, wherein the at least one sound absorber is adhered to an adhesive, and to an adhesive composition for securing the at least one sound absorber to the surface of the pneumatic vehicle tire.

Background

Pneumatic vehicle tires of the above-mentioned type are known from DE 102007028932 a1 and WO 2015149959 a 1. The sound absorber in DE 102007028932 a1 is in the form of a foam ring and reduces air vibrations in the tyre, thereby producing an improvement in the sound characteristics in the vehicle. The foam ring is made of open-cell foam and is also referred to as an "internal absorber". The sealant subsequently applied to the interior of the tire after the tire heating operation serves two functions: which seals the undesired puncture of the tire in the tread area and, in the event of damage to the inner layer, the viscous sealant flows into the damaged location. In addition, the sealant also acts as an "adhesive" for securing the acoustic foam ring.

The sealant may be polyurethane based or based on cross-linked butyl rubber, cross-linked polybutylene or silicone based adhesive mixtures.

US 2016/0001612 a1 discloses a sealant for fixing a sound absorber, wherein the sealant contains 20 to 40% by weight of butyl rubber, 20 to 30% by weight of polybutene, and 35 to 50% by weight of a filler.

However, producing a sealant and using it as a fastening means for a sound absorber is expensive and inconvenient if the self-sealing properties (if any) are not required to a great extent. One challenge is that the chemical composition of the adhesive used to fix the sound absorber must be compatible with the other tire components, and in particular must ensure proper flow and proper tack of the adhesive. In particular, the adhesive should have a relatively simple composition (compared to the sealant) and an optimized viscosity.

Disclosure of Invention

It is therefore an object of the present invention to provide a pneumatic tire for vehicles comprising at least one sound absorber adhesively attached to the inner surface of the interior of said tire opposite the tread, wherein the sound absorber is adhered to an adhesive which can be produced relatively easily and cost-effectively, wherein the adhesion of the sound absorber should be ensured during the entire life of the tire.

This object is achieved when the binder contains at least the following components:

-from 10 to 80% by weight of at least one rubber, and

-11 to 80% by weight of at least one polyolefin, and

-from 2 to 20% by weight of at least one hydrocarbon resin.

Since the adhesive contains the listed substances in the amounts listed, it has a comparatively simple composition, is compatible with other tire components, and in particular has an optimized viscosity and thus optimized flow characteristics together with very good adhesion. Therefore, adhesion of at least one sound absorber in the pneumatic tire for a vehicle according to the present invention is ensured during the life of the tire. The pneumatic vehicle tire according to the present invention is produced in a relatively simple and cost-effective manner.

In the context of the present invention, "viscosity" is understood to mean in particular the complex viscosity (for example by means of a plate-plate rheometer at a particular target temperature), unless otherwise stated. In the context of the present invention, the complex viscosity at relatively high temperatures is relevant, such as in particular at 120 ℃.

The invention further provides an adhesive composition for fixing at least one sound absorber to the surface of a pneumatic tire of a vehicle (adhesive for short), comprising at least the following components:

-from 10 to 80% by weight of at least one rubber, and

-11 to 80% by weight of at least one polyolefin, and

-from 2 to 20% by weight of at least one hydrocarbon resin.

The adhesive-compatible vehicle pneumatic tire surface may in principle be any desired surface to which the sound absorber may be secured for use over a relatively long period of time, in particular for long durability in vehicle operation and tire life.

It is advantageous to attach at least one sound absorber inside the tire, i.e. on the inner surface opposite the tread as described above. The surface may be of any desired size and in accordance with the geometry and dimensions of the sound absorber.

The sound absorber of a pneumatic vehicle tyre according to the invention can in principle be any element or any combination of elements which can be attached to its inner surface by adhesion in a pneumatic vehicle tyre and which reduces the acoustic emission of the tyre in operation of the vehicle.

In a preferred embodiment, the at least one sound absorber is at least one porous damping element. The porous material has inter alia the following advantages: in addition to sound absorption, they also introduce an excessive self-weight into the tire and therefore do not cause unnecessary damage to the rolling resistance characteristics of the tire.

The porous material forming the damping element is for example selected from the group consisting of those having a mass of 18 to 300kg/m³Preferably 30 to 35kg/m³A density of 18 to 300kg/m and a hardness of 6.5 kPa, in particular polyether-based and/or polyester-based polyurethane foams³Preferably 30 to 35kg/m³Polyester of density and hardness of 6.5 kpa, polyether and also any mixture of porous, sound-absorbing materials, such as glass or rock wool, loop or long pile fabrics or nonwovens or cork. Other possible porous materials suitable for use as damping elements are, for example, melamine resin foams or building foams (builder's foam).

It is particularly preferred when the sound absorber, preferably at least one porous damping element, contains at least one polyurethane. Polyurethanes are particularly suitable because of their specific density and other properties and also their availability.

In a particularly advantageous embodiment, the porous damping element is a sound-absorbing foam ring which is closed or opened in the circumferential direction. The ring ensures uniform sound absorption and the tire maintains its uniformity. The rings may be closed in the circumferential direction or open in the form of strips, wherein the ends of the strips may or may not touch, or may also overlap.

The foam of the foam ring is preferably an open-cell foam, as the foam is most suitable for sound absorption.

It is particularly preferred when the sound absorber is a closed sound absorbing foam ring made of polyurethane, particularly preferably polyether-based polyurethane foam.

Such foams are known to those skilled in the art.

Furthermore, the sound absorber or absorbers may have any desired shape, for example individual elements in the shape of blocks, strips or the like, which may be combined with one another as desired.

The components of the adhesive are described in more detail below. All the statements apply to the adhesive for pneumatic vehicle tires according to the invention and to the adhesive composition according to the invention, i.e. simply referred to as adhesive according to the invention.

According to the invention, the adhesive contains the following components:

-from 10 to 80% by weight of at least one rubber, and

-11 to 80% by weight of at least one polyolefin, and

-from 2 to 20% by weight of at least one hydrocarbon resin.

The rubber may in principle be any rubber known to the person skilled in the art.

Where the adhesive contains two or more different rubbers, the total amount is 10% to 80% by weight, and the reported amounts are based on the total amount of rubber present, unless otherwise specified.

In a preferred embodiment of the present invention, at least one diene rubber is involved.

Thus, the adhesive preferably contains 10 to 80% by weight of at least one diene rubber.

The term diene rubber is understood to mean a rubber which is formed by polymerization or copolymerization of dienes and/or cycloolefins and thus contains C ═ C double bonds in the main chain or in side groups.

The at least one diene rubber is preferably selected from the group consisting of: natural polyisoprene (natural rubber, NR), synthetic polyisoprene (IR), epoxidized polyisoprene, butadiene rubber (polybutadiene, BR), butadiene-isoprene rubber, solution polymerized styrene-butadiene rubber (SSBR), emulsion polymerized styrene-butadiene rubber (ESBR), styrene-isoprene rubber, liquid rubbers having a weight average molecular weight Mw (according to GPC) of more than 20000 g/mol, halobutyl rubber, polynorbornene, isoprene-isobutylene copolymer, ethylene-propylene-diene rubber, nitrile rubber, chloroprene rubber, acrylate rubber, fluororubber, silicone rubber, polysulfide rubber, epichlorohydrin rubber, styrene-isoprene-butadiene terpolymer, hydrogenated acrylonitrile butadiene rubber, and hydrogenated styrene-butadiene rubber.

In a particularly advantageous embodiment of the invention, the rubber is selected from the group consisting of: natural Rubber (NR), synthetic polyisoprene (IR), Butadiene Rubber (BR), styrene-butadiene rubber (SBR), butyl rubber (IIR) and halogenated butyl rubber. Such rubbers are used in the constituent parts of vehicle tires and are therefore particularly compatible with the constituent parts of the adjoining adhesive.

The butyl rubber may be any butyl rubber known to those skilled in the art. The butyl rubber in the adhesive has the following advantages: which is compatible with the rubber of the inner layer of the vehicle tyre and has a relatively high air tightness. Furthermore, 10 to 80% by weight of at least one butyl rubber contributes to the adhesive having a viscosity suitable for the application.

In an advantageous embodiment of the invention, the adhesive according to the invention contains the following components:

-from 10 to 50% by weight of at least one butyl rubber, and

-from 31 to 80% by weight of at least one polyolefin, and

-from 2 to 20% by weight of at least one hydrocarbon resin.

In a preferred embodiment of the invention, the adhesive contains at least one butyl rubber in an amount of 20 to 40% by weight, particularly preferably 20 to 38% by weight, very particularly preferably 20 to 28% by weight, very particularly preferably 23 to 28% by weight. These preferred embodiments further optimize the viscosity and tack of the adhesive.

In a further preferred embodiment of the present invention, the amount of the at least one butyl rubber is from 51 to 80% by weight.

It should be emphasized at this point that the adhesive does not replace the inner layer of a typically existing pneumatic tire for a vehicle. On the contrary, the pneumatic vehicle tire according to the invention comprises all the other components known in the art (i.e. tread, sidewalls, carcass plies, belts, inner layers, etc.).

In a particularly preferred embodiment of the present invention, a pneumatic tire for a vehicle comprises an inner layer (innerliner) comprising at least one halobutyl rubber and/or at least one butyl rubber, wherein an adhesive comprising the above-described ingredients is adhered inside the tire to the radially inwardly oriented inner layer surface to secure a sound absorber.

In a further advantageous embodiment of the invention, the adhesive contains 10 to 80% by weight of at least one rubber, wherein the rubber is selected from the group consisting of: natural Rubber (NR), synthetic polyisoprene (IR), Butadiene Rubber (BR), styrene-butadiene rubber (SBR), and halobutyl rubber.

In a preferred embodiment of the invention, the amount of the at least one rubber is from 30 to 60% by weight, preferably from 40 to 55% by weight, particularly preferably from 45 to 50% by weight.

In a further preferred embodiment of the invention, the amount of the at least one rubber is up to 80% by weight, in particular 60 to 80% by weight.

In a further preferred embodiment of the invention, the adhesive contains at least one butyl rubber and at least one rubber selected from the group consisting of: natural Rubber (NR), synthetic polyisoprene (IR), Butadiene Rubber (BR), styrene-butadiene rubber (SBR), and halogenated butyl rubber, wherein the total amount is 10 to 80% by weight.

Any desired amount ratio of butyl rubber to other rubber is conceivable. In an advantageous development of the invention, 50 to 99% by weight of the total amount of rubber present is rubber selected from the group consisting of Natural Rubber (NR), synthetic polyisoprene (IR), Butadiene Rubber (BR), styrene-butadiene rubber (SBR) and halobutyl rubber, and 1 to 50% by weight is at least one butyl rubber.

According to the invention, the adhesive contains 11 to 80% by weight of at least one polyolefin. The amount of the at least one polyolefin is preferably from 31 to 80% by weight, particularly preferably from 35 to 70% by weight, very particularly preferably from 35 to 60% by weight, very particularly preferably from 35 to 57% by weight. Such amounts achieve optimal flow characteristics as well as optimal tack of the adhesive, together with good producibility (processability).

The at least one polyolefin preferably has a number average Mn (according to GPC) of the molecular weight distribution of from 0.1 to 5kg/mol, particularly preferably from 0.4 to 1.6kg/mol, very particularly preferably from 0.4 to 1.4kg/mol, further preferably from 1 to 1.4kg/mol, further particularly preferably from 1.1 to 1.4kg/mol (for example 1.3 kg/mol).

Polyolefins having the listed Mn range are particularly suitable for providing adhesives with desirable flow properties in conjunction with strong tack.

The at least one polyolefin is particularly preferably at least one polybutene.

Polybutene is particularly suitable for adjusting the desired properties of the adhesive. The number average Mn of the above-mentioned preferred, particularly preferred, etc. molecular weight distributions applies in particular to the at least one polybutene.

Such polybutenes are commercially available.

In a particularly advantageous development of the invention, the at least one polyolefin has a chlorine content of not more than 5mg/kg, preferably not more than 3 mg/kg. The present description relates to mg of chlorine per kg of polyolefin. In a preferred embodiment of the invention, the binder contains at least one polyolefin having a chlorine content of not more than 1.5mg/kg, particularly preferably less than 1 mg/kg. The polyolefin is preferably polybutene.

In a particularly preferred embodiment of the invention, the binder therefore contains at least one polybutene which has a chlorine content of not more than 5mg/kg, preferably not more than 3mg/kg, particularly preferably not more than 1 mg/kg. Suitable polybutenes, also referred to as polyisobutylenes, are available, for example, from BASF under the trade nameAre known.V-500, V-640 or V-190 are especially preferred hereWhich is suitable.

Such (almost) chlorine-free polybutenes allow in particular the use of sound absorbers made of foam, preferably Polyurethane (PU), wherein the chlorine-free polybutenes are particularly compatible with the (PU) foam and little, if any, decomposition processes occur.

According to the invention, the binder contains from 2 to 20% by weight of at least one hydrocarbon resin. The amount of the at least one hydrocarbon resin is preferably from 5 to 10% by weight, particularly preferably from 5 to 8% by weight, very particularly preferably from 5 to 6.5% by weight.

Such preferred and particularly preferred amounts further optimize the tack and viscosity of the adhesive.

It will be clear to those skilled in the art that hydrocarbon resins are polymers built from monomers, wherein these hydrocarbon resins are formally built from derivatives of these monomers by linking these monomers to each other.

In the context of the present application, the term "hydrocarbon resin" includes resins comprising carbon and hydrogen atoms and optionally heteroatoms (such as in particular oxygen atoms).

The hydrocarbon resin may be a homopolymer or a copolymer. In this application, according toOn-line (retrieved at 1/2/2017, the article last updated at 8/2008), the term "homopolymer" is understood to mean a polymer "formed from only one type of monomer".

In the context of the present invention, "copolymer" is understood to mean a polymer formed from a plurality (i.e. two or more) of different monomers. Thus, in the context of the present invention, the hydrocarbon resin may also be, for example, a copolymer of three different monomers.

The monomer may be any monomer of the hydrocarbon resins known to the person skilled in the art, such as an aliphatic monomer, in particular aliphatic C₅Monomers, further cationically polymerizable unsaturated compounds, including aromatic compounds and/or terpenes and/or olefins and/or cyclic olefins.

In particularPreferably, the monomer is C₅And C₉A monomer.

These aromatic compounds (aromatic monomers) may be, for example, alpha-methylstyrene and/or styrene and/or vinyltoluene and/or indene and/or coumarone and/or methylindene and/or methylisochromone and/or phenol.

The aromatic monomer is preferably alpha-methylstyrene and/or styrene and/or vinyltoluene and/or indene and/or coumarone and/or methylindene and/or methyl coumarone.

In a preferred embodiment of the present invention, the at least one hydrocarbon resin does not comprise a phenolic hydrocarbon resin, i.e. the at least one hydrocarbon resin is preferably not based on phenol as a monomer. Thus in the case of a mixture of at least two hydrocarbon resins, it is preferred that neither of these hydrocarbon resins is based on phenol as a monomer. Thus, in a preferred embodiment of the invention, the binder is free of phenol resin, i.e. contains 0 to 0.1% by weight, ideally 0% by weight of phenol resin.

According toIn-line, the term "alkene" is a common term for "acyclic and cyclic aliphatic hydrocarbons having one or more reactive C ═ C double bonds in the molecule, now better referred to as alkenes or cycloalkenes, and also in a broader sense is the term used for their substituted derivatives. Thus, in the context of the present invention, the encompassed term "alkene" includes unsaturated terpenes, alkenes, and cyclic alkenes.

The olefin may be, for example, 1-butene and/or 2-butene and/or butadiene.

In a preferred embodiment of the invention, the hydrocarbon resin is at least one aliphatic resin, i.e. a resin which does not contain an aromatic ring system. Such resins consist of aliphatic monomers/derivatives thereof to the extent of 100% by weight.

In a further embodiment of the invention, the resin consists of from 10 to 99% by weight, preferably from 50 to 99% by weight, particularly preferably from 70 to 99% by weight, of aliphatic monomers and from 1 to 90% by weight, preferably from 1 to 50% by weight, particularly preferably from 1 to 30% by weight, of aromatic monomers.

In a particularly preferred embodiment of the invention, the hydrocarbon resin is at least C₅Monomeric construction and known to the person skilled in the art as so-called C₅At least one resin of the resins. This makes it possible to achieve particularly good properties of the adhesive, in particular optimized flow characteristics together with good adhesion. In particular, these advantages are remarkable as compared with phenol resins (phenol resins).

Aliphatic C₅The monomer may be derived from C₅Monomers of crude oil fractions (e.g. isoprene), and/or monomers of terpenes and/or cycloolefins and/or olefins (e.g. pentene). The term "C₅"is understood to mean that these monomers are built up from five carbon atoms.

Furthermore, it is known to the person skilled in the art that, in addition to aliphatic monomers having five carbon atoms, C₅The crude oil fraction may also contain other aliphatic monomers (building blocks) having, for example, four carbon atoms (i.e., C)₄Monomer) or six carbon atoms (C)₆Monomer).

In an advantageous embodiment of the invention, the adhesive contains 1 to 50% by weight of at least one filler, which allows the viscosity of the adhesive to be optimally adjusted. For this purpose, the amount of the at least one filler is particularly preferably from 1 to 35% by weight, very particularly preferably from 5 to 20% by weight, and very particularly preferably from 5 to 15% by weight, and very particularly preferably from 5 to 10% by weight, based on the total amount of the binder.

The filler may be any filler known to the person skilled in the art, in particular reinforcing fillers, such as carbon black and/or silica, with the term precipitated silica being familiar as filler for tire rubber mixtures, and is particularly preferred.

Additional reinforcing and non-reinforcing fillers, in particular silica-based fillers, such as silicates or sand, are also conceivable.

In the context of the present invention, further non-reinforcing fillers include aluminosilicates, sand, kaolin, chalk, starch, magnesium oxide, titanium dioxide or rubber gels and also fibers (e.g. aramid fibers, glass fibers, carbon fibers, cellulose fibers).

Optional additional reinforcing fillers are, for example, graphite and graphene, and so-called "carbon-silica dual-phase fillers".

In a preferred embodiment of the invention, the filler comprises at least one carbon black. This has the following advantages: the cohesion of the adhesive increases and the tack of the adhesive decreases during the production process. The stability and tear properties of the adhesive are simultaneously improved.

In the context of the present invention, in principle all types of carbon black known to the skilled worker are conceivable.

In an advantageous embodiment of the invention, carbon blacks having an iodine absorption according to ASTM D1510 of from 20 to 180g/kg, particularly preferably from 30 to 140g/kg, and a DBP value according to ASTM D2414 of from 30 to 200ml/100g, preferably from 90 to 180ml/100g, particularly preferably from 110 to 180ml/100g, are used.

In a further preferred embodiment of the invention, carbon blacks of the N326-type are used.

Mixtures of two or more carbon blacks are also conceivable.

In a further preferred embodiment of the invention, the filler comprises at least one silica.

This achieves optimal reinforcement of the adhesive and allows good viscosity control and adjustment. Furthermore, the use of at least one silica increases the cohesion of the adhesive and reduces the tackiness of the adhesive during the production process. The stability and tear properties of the adhesive are simultaneously improved.

Mixtures of two or more silicas are also conceivable.

The silica may be silica known to those skilled in the art to be suitable as a filler for tire rubber compounds. Thus, available dioxidesSilicon, for example, includes silicon from the winning company (Evonik) aloneVN3 (trade name), and also silicas having a relatively low BET surface area (e.g., such as those from Suwei corporation (Solvay)1115 or1085) And highly dispersible silicas, so-called HD silicas (for example from Sowey Co., Ltd.)1165MP)。

Mixtures of the listed fillers, such as in particular at least one carbon black in combination with at least one silica, which likewise provide the listed advantages, are also conceivable and preferred.

In a particularly advantageous embodiment of the invention, the adhesive is free of peroxy compounds, i.e. according to this embodiment the adhesive contains from 0% to 0.001% by weight, ideally 0% by weight, of such compounds, wherein the reported amounts relate to each substance individually.

In a particularly advantageous embodiment of the invention, the binder is free of vulcanizing agents and metal oxides, i.e. according to this embodiment the binder contains 0 to 0.001% by weight, ideally 0% by weight, of such compounds, wherein the reported amounts relate to each substance individually.

It is therefore particularly preferred when the adhesive does not contain any substances which would cause crosslinking of the adhesive and which are present in sealants known from the prior art. Thus, as a means of fixation, the adhesive has a relatively simple and cost-effective composition compared to the sealant, and also has an optimized viscosity.

In this preferred embodiment of the invention, typical substances are the following, which are present only in the respective amounts (if any):

from 0 to 0.001% by weight of a peroxide, such as dibenzoyl peroxide,

and also preferably:

from 0 to 0.001% by weight of zinc oxide,

from 0 to 0.001% by weight of a quinone, such as quinone dioxime,

the adhesive may further contain additional ingredients, such as, in particular, plasticizers, for example, one or more oils.

In a preferred embodiment of the invention, the adhesive contains 0.2 to 12% by weight of at least one plasticizer, wherein the adhesive especially and preferably contains a mixture of two different plasticizers.

The use of 0.2 to 12% by weight, preferably 2 to 6% by weight, of at least one plasticizer ensures good processability of the adhesive and a further optimized viscosity.

The plasticizer may be any plasticizer known to the person skilled in the art, in particular an oil, such as in particular an aromatic, naphthenic or paraffinic mineral oil plasticizer, for example MES (mild extraction solvate) or RAE (residual aromatic extract) or TDAE (treated distillate aromatic extract) or rubber-to-liquid oil (RTL) or biomass-to-liquid oil (BTL), preferably having a polycyclic aromatic compound content of less than 3% by weight according to process IP 346. Mineral oils are particularly preferred as plasticizers.

When mineral oil is used, the oil is preferably selected from the group consisting of: DAE (distilled aromatic extract) and/or RAE (residual aromatic extract) and/or TDAE (treated distilled aromatic extract) and/or MES (mild extracted solvent) and/or naphthenic oils.

In a preferred embodiment of the invention, the adhesive consists of butyl rubber, polyolefin, hydrocarbon resin, filler and plasticizer, wherein the above explanations regarding the type and amount of the respective substances apply.

In a preferred embodiment of the invention, the adhesive consists in particular of:

-from 10 to 50% by weight of at least one butyl rubber, and

-from 31 to 80% by weight of at least one polyolefin, and

-from 2 to 20% by weight of at least one hydrocarbon resin, and

-from 1 to 50% by weight of at least one filler, and

-0.2 to 12% by weight of at least one plasticizer.

The listed ingredients always amount to 100% by weight.

In particular, such adhesives are optimized with respect to processability, flow characteristics and stability. Due to this composition, the adhesive further has an optimal adhesion.

In a further preferred embodiment of the invention, the adhesive consists of rubber, polyolefin, hydrocarbon resin, filler and plasticizer, wherein the above explanations regarding the type and amount of the respective substances apply.

In a preferred embodiment of the invention, the adhesive consists in particular of:

-10 to 80% by weight of at least one rubber selected from the group consisting of: natural Rubber (NR), synthetic polyisoprene (IR), Butadiene Rubber (BR), styrene-butadiene rubber (SBR), butyl rubber (IIR) and halogenated butyl rubber, and

-11 to 80% by weight of at least one polyolefin, and

-from 2 to 20% by weight of at least one hydrocarbon resin, and

-from 1 to 50% by weight of at least one filler, and

-0.2 to 12% by weight of at least one plasticizer.

In a further preferred embodiment of the invention, the adhesive consists of rubber, polyolefin, hydrocarbon resin, filler and plasticizer, wherein the above explanations regarding the type and amount of the respective substances apply.

In a preferred embodiment of the invention, the adhesive consists in particular of:

-10 to 80% by weight of at least one rubber selected from the group consisting of: natural Rubber (NR), synthetic polyisoprene (IR), Butadiene Rubber (BR), styrene-butadiene rubber (SBR) and also halobutyl and butyl rubbers, wherein the proportion of butyl rubber is from 1 to 50% by weight, based on the total amount of rubber present, and

-11 to 80% by weight of at least one polyolefin, and

-from 2 to 20% by weight of at least one hydrocarbon resin, and

-from 1 to 50% by weight of at least one filler, and

-0.2 to 12% by weight of at least one plasticizer.

In particular, the binder is produced by-preferably thoroughly-mixing the substances, wherein the mixing can be carried out in one or more mixing stages. Mixing devices known to those skilled in the art, such as internal mixers and/or extruders, can be used here. The mixing duration and mixing temperature can also be adjusted depending on the composition and viscosity of the binder.

The binder can also be produced in an extruder, for example a preferably twin-screw extruder.

It is conceivable that solvents may also be used to mix the binder to reduce the viscosity, preferably temporarily.

The adhesive may be applied to the inner surface of the tire, in particular to the surface opposite the tread, by any means known to those skilled in the art.

Preference is given to spray application or application using a high-pressure pump.

The adhesive is preferably applied in a film thickness (in the radial direction) of 0.05 to 10mm, wherein it may vary in the axial direction for manufacturing reasons. The adhesive may be applied as a complete surface covering or only in certain areas.

Drawings

The present invention will be described more specifically hereinafter with reference to working examples. An example of a pneumatic vehicle tire of the present invention is shown in fig. 1.

Detailed Description

Figure 1 depicts a section through a meridian-passing motor vehicle tyre having a patterned tread 1, sidewalls 2, bead areas 3, bead cores 4 and also a multilayer belt band 5 and carcass insert 6. On its inner surface, the tire is covered with an inner layer 7 of an airtight rubber compound. Adhesive 8 is then applied (in the finished tire) to the inner surface of inner layer 7 opposite tread 1.

According to a first example, the binder 8 consists of:

27.3% by weight of a butyl rubber,

55.8% by weight of polybutene having a Mn of 1300g/mol,

5.3% by weight of an aliphatic hydrocarbon resin (C)₅A resin),

8.4% by weight of N326 carbon black as filler,

3.2% by weight of a mineral oil plasticizer.

According to a further example, the binder 8 contains the following substances:

48% by weight of at least one rubber selected from the group consisting of: natural Rubber (NR), synthetic polyisoprene (IR), Butadiene Rubber (BR), styrene-butadiene rubber (SBR), and halogenated butyl rubber,

35.1% by weight of polybutene having a Mn of 1300g/mol,

5.3% by weight of an aliphatic hydrocarbon resin (C)₅A resin),

8.4% by weight of N326 carbon black as filler,

3.2% by weight of a mineral oil plasticizer.

This adhesive has a complex viscosity of, for example, 2700Pas (pascal seconds) at 120 ℃ (0.02Hz, frequency sweep, plate-to-plate rheometer) and is therefore particularly optimized with regard to processability, flow characteristics, stability. Due to this composition, the adhesive further has an optimal adhesion.

Adhered to adhesive 8 as sound absorber 9 is a sound absorbing foam ring, as described below, which is pressed into place immediately after adhesive 8 is applied. With respect to the sound absorbing properties of the sound absorbing foam ring, the sound absorbing foam ring is frequency matched to the tire cavity. The sound absorber 9, here in the form of a foam ring, has, for example, an approximately elongate triangular cross section which is symmetrical with respect to the tire center line.

The foam of the foam ring is an open-cell foam, as the foam is most suitable for sound absorption. The foam includes, for example, polyurethane.

The adhesive is introduced, for example by spray application, so that it covers at least the inner surface opposite the tread 1 or only a portion thereof. The tire may be rotated to optimally distribute the adhesive on the inner surface. Further, the adhesive is introduced in an amount such that the thickness of the adhesive/film thickness is between 0.05mm and 10 mm. At least immediately after application, the adhesive should be relatively liquid to achieve optimal distribution of the adhesive on the surface, and should also be tacky. At this point, a preformed foam ring is introduced into the tire interior and pressed into place. After introduction, the foam ring adheres to the elastically deformable but largely stable adhesive 8.

Description of the reference numerals

1 Tread

2 side wall

3 bead region

4 bead core

5 Belt band

6 matrix inserts

7 inner layer

8 adhesive

9 sound absorber

rR radial direction (arrow direction pointing radially outward from radially inward)

aR axial direction