阅读说明：本技术 涂布的气囊用基布、其制造方法以及用于所述制造方法的涂料组合物 (Coated base fabric for airbag, method for producing same, and coating composition for use in said production method ) 是由 原田弘孝 于 2019-03-13 设计创作，主要内容包括：本发明的一个目的是提供一种在不依赖于涂层中树脂的量和种类的情况下能够实现足够的耐热性的涂布的气囊用基布。提供了一种涂布的气囊用基布,其特征在于,在织物的至少一侧上直接地或通过一个或多个其他层布置涂层,其中涂层包含热响应型发泡剂。(An object of the present invention is to provide a coated base fabric for an airbag capable of achieving sufficient heat resistance without depending on the amount and kind of resin in the coating layer. There is provided a coated base fabric for an airbag, characterized in that a coating layer is disposed on at least one side of the fabric, either directly or through one or more other layers, wherein the coating layer comprises a thermally responsive foaming agent.)

1. A coated base fabric for an airbag, comprising a coating layer provided on at least one surface of a woven fabric directly or with one or more other layers interposed therebetween,

the coating comprises a thermally responsive foaming agent.

2. The coated base fabric for an airbag according to claim 1, wherein the thermally responsive foaming agent is a thermally decomposable chemical foaming agent.

3. The coated base fabric for an airbag according to claim 1 or 2, wherein the coating layer is a porous body having closed pores.

4. The coated base fabric for an airbag according to claim 3, wherein the coating layer is a layer foamed using at least one member selected from the group consisting of: chemical blowing agents, expandable microcapsules and hollow microcapsules.

5. The coated base fabric for an airbag according to any one of claims 1 to 4, wherein the coating layer comprises a resin.

6. The coated base fabric for an airbag according to any one of claims 1 to 4, wherein the coating layer comprises 10 to 200g/m in terms of an area of the surface of the textile fabric²The amount of resin (c).

7. The coated base fabric for an airbag according to claim 5 or 6, wherein the resin is a silicone-based resin.

8. A composition for use in the coating of a coated base fabric for an airbag, the composition comprising a thermally responsive foaming agent.

9. The composition according to claim 8, which is used in a method for producing a coated base fabric for an airbag at a temperature lower than the foaming initiation temperature of the heat-responsive foaming agent.

10. A method for manufacturing a coated base fabric for an airbag, the method comprising:

(1) a coating material comprising a thermally responsive foaming agent is disposed on at least one surface of the textile, either directly or with one or more other layers interposed therebetween.

Technical Field

The present invention relates to a coated base fabric for an airbag, a method for producing the base fabric, and a coating composition used in the production method.

Background

Airbags are used for the purpose of protecting human bodies, such as the face and the front head of an occupant, in the event of a collision due to an automobile accident. Specifically, in the airbag system, a sensor operates in response to a collision shock, generating high-temperature and high-pressure gas, by which the airbag is instantaneously inflated to achieve the above object. In recent years, an airbag has become widespread as a kind of safety equipment, and practical applications thereof have increased, such as not only airbags installed for driver and passenger seats but also other airbags including knee airbags, side airbags, and air curtains. Furthermore, an increasing number of automobiles are equipped with a plurality of airbags as standard equipment.

As the number of airbags to be installed and the installation positions thereof increase, there is an increasing demand for further reducing the weight and size of airbag systems, and each part of the system has been designed to be smaller and lighter. Under such circumstances, it has also been studied to reduce the weight of the bag body of the airbag by reducing the volume of the airbag or using a non-coated base fabric.

A variety of inflation devices are now available for inflating the balloon. The use of ignition-type (pyro-type) inflators has recently increased rapidly from the viewpoint of weight and size reduction. However, the ignition type inflator tends to have a large thermal influence on the airbag because a large amount of suspended particles from the partially combusted components of the gas generating agent and the ignition residue of the gunpowder are generated. It is therefore desirable that not only the base fabric for the airbag main body but also the heat-resistant reinforcing fabric for the inflator connecting port, particularly to which a heat load is applied, have high heat resistance.

A scrap obtained by cutting a cloth for an airbag main body has been used as a reinforcing cloth. As the weight of the cloth for the main body becomes lighter, the heat resistance of the cloth for the main body becomes lower; to compensate for this, the number of pieces of reinforcing cloth used needs to be increased. Increasing the number of pieces of the reinforcing fabric complicates the sewing operation and leads to an increase in the mass of the entire airbag. There is therefore a need for a cloth that can resist thermal damage even if the number of pieces of cloth used is reduced.

In order to withstand the high-temperature gas instantaneously released from the inflator, a gas having a gas pressure of 60 to 120g/m has been used²In an amount to adhere a heat resistant elastomer such as chloroprene rubber or silicone rubber to the coated base fabric of the textile. In addition, a balloon has been studiedA base fabric in which a plurality of layers are formed by coating a coating liquid of an elastomer resin a plurality of times, and in which the total coating amount is 100 to 400g/m in terms of the elastomer resin²(for example, see patent document 1).

Reference list

Patent document

Patent document 1: JP2008-002003A

Summary of The Invention

Technical problem

The inventors of the present invention found through their own studies that: although the conventionally coated base fabrics for airbags have excellent heat resistance because of a large resin coating amount, they are large in mass as a whole, which is not advantageous in terms of weight reduction. The inventors have also found another problem: since the coating layers of the conventional base cloths are hard, they are not advantageous in terms of storage. Furthermore, the inventors have found additional problems: when the coating amount of the resin is large, the adhesiveness due to the contact between the coated surfaces increases.

Accordingly, it is an object of the present invention to provide a coated base fabric for an airbag that achieves sufficient heat resistance without depending on the amount or kind of resin in the coating layer.

Solution to the problem

After repeated attempts to achieve the above object, the inventors of the present invention have for the first time established a unique method for evaluating heat resistance of a base fabric for an airbag suitable for coating. This evaluation method enables the heat resistance of the base fabric to be evaluated in consideration of the effects of heat capacity and heat transfer. The inventors of the present invention have conducted intensive studies using this evaluation method, and found that a coated base fabric for an airbag including a coating layer containing a thermally responsive foaming agent has excellent heat resistance due to the action of a distinctive coating layer; and thus sufficient heat resistance is achieved without depending on the amount or kind of resin in the coating layer.

The inventors of the present invention have made further intensive studies based on this finding, and have completed the present invention. The present invention includes the following embodiments.

A coated base fabric for an airbag, comprising a coating layer provided on at least one surface of a woven fabric directly or with one or more other layers interposed therebetween,

the coating comprises a thermally responsive foaming agent.

Item 2 the coated base fabric for an airbag according to item 1, wherein the thermally responsive foaming agent is a thermally decomposable chemical foaming agent.

Item 3 the coated base fabric for an airbag according to item 1 or 2, wherein the coating layer is a porous body having closed cells.

The coated base fabric for an airbag according to item 3, wherein the coating layer is a layer foamed with at least one member selected from the group consisting of: chemical blowing agents, expandable microcapsules and hollow microcapsules.

The coated base fabric for an airbag according to any one of items 1 to 4, wherein the coating layer comprises a resin.

Item 6 the coated base fabric for an airbag according to any one of items 1 to 4, wherein the coating layer comprises 10 to 200g/m in terms of area relative to the surface of the textile²The amount of resin (c).

The coated base fabric for an airbag according to item 5 or 6, wherein the resin is a silicone-based resin.

Item 8. a composition for use in coating of a coated base fabric for an airbag, the composition comprising a thermally responsive foaming agent.

The composition according to item 9, which is used in the method for producing a coated base fabric for an airbag at a temperature lower than the foaming initiation temperature of the heat-responsive foaming agent.

A method for manufacturing a coated base fabric for an airbag, the method comprising:

(1) a coating material comprising a thermally responsive foaming agent is disposed on at least one surface of the textile, either directly or with one or more other layers interposed therebetween.

Advantageous effects of the invention

The coated base fabric for an airbag of the present invention achieves sufficient heat resistance without depending on the amount or kind of resin in the coating layer.

Description of the embodiments

The coated base fabric for an airbag of the present invention includes a coating layer provided on at least one surface of a textile fabric directly or with one or more other layers interposed therebetween, the coating layer containing a thermally responsive foaming agent.

Textile fabric

The textile is excellent as a base fabric for an airbag because it is excellent in mechanical strength and a reducible thickness. The structure of the textile may be, but is not limited to, plain weave, twill weave, satin weave, variations of these weave forms, multiaxial weave forms, and the like; among these, a plain weave excellent in mechanical strength is particularly preferable.

The textile is preferably a fabric woven from synthetic fibre yarns.

As the synthetic fibers, various synthetic fibers can be used if necessary. The synthetic fiber is not particularly limited and may be selected from a wide range. Examples of the synthetic fibers include aliphatic polyamide fibers such as nylon 66, nylon 6, nylon 46 and nylon 12; aramid fibers such as aramid fibers; polyester fibers such as polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate; wholly aromatic polyester fibers; poly (p-phenylene benzobis)

Azole) fibers (PBO fibers); ultra-high molecular weight polyethylene fibers; polyphenylene sulfide fibers; polyether ketone fibers; and so on. From the economical point of view, as the synthetic fibers, polyester fibers and polyamide fibers are preferable, and polyamide 6,6 is particularly preferable. These synthetic fibers may be obtained from starting materials that are partly or wholly recycled materials.

The synthetic fibers may contain various additives to facilitate the yarn making and subsequent weaving processes. Examples of the additives include antioxidants, heat stabilizers, smoothing agents, antistatic agents, thickeners, flame retardants, and the like.

The synthetic fibers may be solution dyed yarns or yarns dyed after spinning. The cross section of the single yarn is not particularly limited; and may be, for example, a generally circular cross-section or an irregular cross-section.

To weave the textile, various synthetic fiber yarns may be used as necessary.

The synthetic fiber yarn used for weaving the textile is preferably a multifilament yarn containing 72 filaments or more from the viewpoint of flexibility and smoothness of the coated surface. The upper limit of the number of filaments is not particularly limited. The number of filaments is preferably 216 or less because the yarn is easy to manufacture.

The fineness is preferably 0.1 to 10dpf relative to the single yarn of the synthetic fiber yarn used for weaving the textile.

The total fineness of the yarns constituting the textile is preferably 350 to 1000 dtex. The total fineness of 1000dtex or less prevents the thickness of the base fabric from being excessively increased, and the thickness can be easily adjusted within an appropriate range; and thus also prevents an excessive increase in rigidity, making it easy to adjust the rigidity within an appropriate range. Therefore, the accommodation property of the airbag can be easily improved. The total fineness of 350dtex or more makes it easy to adjust the mechanical properties such as tensile strength and tear strength of the coated base fabric during the operation of the airbag to a sufficiently high level.

The cover factor of the textile is preferably 1,800 to 2,500, and more preferably 1,900 to 2,450. A cover factor of 1,800 or more makes it easy to adjust the physical properties (tensile strength and tear strength) required for the airbag to a sufficiently high level. The cover factor of 2,500 or less facilitates knitting, prevents excessive increase in rigidity, and improves storage property. The coverage Coefficient (CF) can be calculated using the following equation. The total titer was in dtex and the weave density in yarn/2.54 cm.

CF ═ total denier of warp yarn^1/2X warp Density + (Total denier of weft yarn)^1/2X weft yarn Density

The oil content of the textile is preferably 0.2 mass% or less. When the amount of oil is 0.2% by mass or less, the adhesion to silicone resin is not excessively reduced; and avoids an extreme reduction in the number of bubbles (cells) on the coating surface due to an excessive reduction in the water content in the textile. In this regard, the amount of oil in the textile is more preferably 0.15 mass% or less, and even more preferably 0.10 mass% or less. The lower limit of the amount of oil in the textile is not particularly limited; and is usually 0.005% by mass or more, and preferably 0.01% by mass or more.

Coating layer

The coating is disposed on at least one surface of the textile either directly or with one or more additional layers interposed between the textile and the coating. The coating covers at least a portion of the surface of the textile. The coating preferably covers more than 90% of the surface of the textile, and more preferably covers the entire surface of the textile.

The coating preferably comprises a resin. As the resin, a plurality of resins can be used as necessary. The resin is preferably an elastomer resin having heat resistance, cold resistance and flame retardancy. From the above viewpoint, the elastomer resin is most preferably a silicone resin.

Specific examples of the silicone-based resin include addition polymerization silicone rubbers such as dimethyl silicone rubber, methyl vinyl silicone rubber, methyl phenyl silicone rubber, trimethyl silicone rubber, fluorosilicone rubber, methyl silicone resin, methyl phenyl silicone resin, methyl vinyl silicone resin, epoxy-modified silicone resin, acrylic-modified silicone resin, polyester-modified silicone resin, and the like. Of these, addition polymerization methyl vinyl silicone rubber is preferable because the rubber exhibits rubber elasticity after curing, excellent strength and stretchability, and a cost advantage.

When a silicone-based resin is used, a curing accelerator may be used to impart higher hardness to the coating layer. Examples of the curing accelerator include platinum group compounds such as platinum powder, chloroplatinic acid, and tetrachloroplatinic acid; a palladium compound; a rhodium compound; organic peroxides such as benzoyl peroxide, p-chlorobenzoyl peroxide and o-chloroperoxide; and so on.

From the viewpoint of heat resistance, the coating layer preferably contains an area meter with respect to the surface of the textile10g/m²More preferably 15g/m or more²Above and even more preferably 20g/m²The above amount of resin. The coating layer of the present invention has higher heat resistance than that of a conventionally coated base fabric for an airbag, and thus sufficient heat resistance is achieved with a lower resin content. The amount of resin in the coating can thus be 200g/m relative to the area of the surface of the textile while achieving sufficient heat resistance²The following. When a smaller amount of resin is preferred, the amount of resin may be 100g/m²The following. When still smaller amounts of resin are preferred, the amount of resin may be 50g/m²The following. This enables the coated base fabric for an airbag of the present invention to be compactly housed and to have high heat resistance. The coated base fabric for an airbag of the present invention can be also sufficiently used as a heat-resistant reinforcing fabric. In this case, unlike the conventional art, it is not necessary to use a plurality of base cloths by stacking them on each other, which facilitates compact storage.

The thickness of the coating layer is preferably 10 μm or more. When the thickness of the coating layer is 10 μm or more, sufficient heat resistance can be easily achieved. For the same reason, the thickness of the coating layer is more preferably 15 μm or more, and even more preferably 20 μm or more. The thickness of the coating is preferably 200 μm or less. When the thickness of the coating layer is 200 μm or less, appropriate flexibility can be easily imparted to the coated textile, good storability can be achieved, and the quality of the base fabric can be low when the base fabric is used not only as the base fabric for the main body but also as the heat-resistant reinforcing fabric. For the same reason, the thickness of the coating layer is more preferably 100 μm or less, and even more preferably 50 μm or less.

The coating layer contains a thermally responsive foaming agent, which imparts more excellent heat resistance to the coating layer. The coating may contain one thermally responsive blowing agent, or multiple thermally responsive blowing agents.

The term "thermally responsive blowing agent" as used herein refers to a compound, composition or structure that has the function of generating a gas in response to heat. When the thermally responsive foaming agent has generated a gas in response to heat, and its residual material is not considered to retain the function of generating a gas, the residual material is not considered to be a "thermally responsive foaming agent".

The heat-responsive foaming agent is not particularly limited, and various heat-responsive foaming agents can be used. Examples of the thermally responsive foaming agent include thermally decomposable chemical foaming agents, thermally expandable microcapsules, and the like.

Thermally decomposable chemical blowing agents are compounds that generate gas by thermal decomposition.

The thermal decomposition temperature of the thermally decomposable chemical blowing agent is preferably 120 to 240 ℃, more preferably 130 to 230 ℃, and even more preferably 140 to 220 ℃ from the viewpoint of heat resistance.

The thermally decomposable chemical blowing agent may be an organic compound or an inorganic compound. Specific examples of the organic thermally decomposable chemical foaming agent include azodicarbonamide (ADCA), Dinitropentamethylenetetramine (DPT), p' -oxybis-benzenesulfonylhydrazide (OBSH), Hydrazonodicarbonamide (HDCA), tetrazole compounds, and the like. The tetrazole compound is not particularly limited, and examples include 5-phenyltetrazole (5-phenyl-1H-tetrazole), bistetrazole (e.g., 5-bistetrazole), and salts thereof. Of these, ADCA is particularly preferable. Specific examples of inorganic thermally decomposable chemical blowing agents include sodium bicarbonate (NaHCO)₃(ii) a Sodium bicarbonate), and the like.

The thermally expandable microcapsules are not particularly limited and may be selected from a wide range. Examples of the thermally expandable microcapsules include those obtained by encapsulating a hydrocarbon in a gas barrier plastic capsule. When the ambient temperature rises, the thermally expandable microcapsules soften and the hydrocarbon vaporizes thereby expanding the capsules.

From the viewpoint of heat resistance, the coating layer contains a heat-responsive foaming agent in an amount necessary to achieve sufficient heat resistance. The amount of the thermally responsive foaming agent contained in the coating layer may be appropriately determined in consideration of the heat resistance imparted by the thermally responsive foaming agent. The amount of the thermally responsive foaming agent is not particularly limited. From the viewpoint of heat resistance, the coating layer preferably contains 0.3 to 40g/m in terms of area relative to the surface of the textile²More preferably 0.5 to 15g/m²And even more preferably from 1 to 10g/m²Thermal response of the total amount ofA type foaming agent.

The coating is preferably a porous body having closed cells. The term "porous body having closed cells" as used herein refers to a porous body having a closed cell structure. By "closed cell" is meant a bubble structure in which bubbles are separated from each other. In this regard, a "porous body having closed pores" is different from a porous body having an open pore structure. Since the coating layer is a porous body having closed pores, the gas remaining in the bubbles lowers the thermal conductivity, thereby obtaining higher heat resistance. In contrast, the porous body having open pores does not exhibit high heat resistance because gas is not retained in the porous body. The physical properties of the porous body having closed cells are not particularly limited and may be selected from a wide range. As the physical properties of the porous body having closed pores, the number of bubbles having a maximum diameter of 20 μm or more is preferably 20 bubbles/mm from the viewpoint of heat resistance²Above, more preferably 30 bubbles/mm²Above, and even more preferably 50 bubbles/mm²The above. The upper limit of the number of bubbles is not particularly limited and may be appropriately determined. From the viewpoint of durability of the coating layer, the number of bubbles having a maximum diameter of 150 μm or more is preferably 15 bubbles/mm²Below, more preferably 10 bubbles/mm²Below, and even more preferably 5 bubbles/mm²The following. In the present specification, the maximum diameter of the bubble means the longest chord in the cross section of the bubble observed in the cross section of the coating layer.

The method for obtaining the coating layer as a porous body having closed pores is not particularly limited and may be selected from a wide range. Examples of the method for obtaining the coating layer as a porous body having closed pores include a method in which foaming is performed using at least one member selected from the group consisting of: chemical blowing agents, expandable microcapsules and hollow microcapsules; and so on.

The chemical blowing agent is not particularly limited and may be selected from a wide range. Examples of the chemical blowing agent include the thermally decomposable chemical blowing agents described above and the like.

The expandable microcapsules are not particularly limited and may be selected from a wide range. Examples of expandable microcapsules include the thermally expandable microcapsules described above, and the like.

The hollow microcapsules are not particularly limited and may be selected from a wide range. Examples of hollow microcapsules include silica glass microcapsules and the like.

The coating may also contain inorganic fillers, if desired. Inorganic fillers are conventionally used for reinforcement, viscosity adjustment, improvement in heat resistance, improvement in flame retardancy, and the like of coating materials such as silicone rubber. The inorganic filler is not particularly limited and may be selected from a wide range. Examples include silica particles and the like.

The specific surface area of the inorganic filler is preferably 50m²More than g, more preferably 50 to 400m²G, and particularly preferably from 100 to 300m²(ii) in terms of/g. When the specific surface area is within this range, excellent tear strength characteristics can be easily imparted to the resulting coating layer. The specific surface area is measured by the BET method. One kind of silica particles may be used alone, or two or more kinds of silica particles may be used in combination. Examples of silica particles usable in the present invention include: natural substances such as quartz, crystal, silica sand, and diatomaceous earth; synthetic substances such as dry silica, silica fume, wet silica, silica gel and colloidal silica; and so on.

In order to more easily impart better fluidity to a coating material such as a resin composition, the inorganic filler may be a hydrophobic inorganic filler in which the surface is subjected to hydrophobic treatment using an organosilicon compound. Examples of the organosilicon compound include: methylchlorosilanes, such as trimethylchlorosilane, dimethyldichlorosilane and methyltrichlorosilane; dimethylpolysiloxane, hexamethyldisilazane, divinyltetramethyldisilazane, dimethyltetravinyldisilazane, hexaorganodisilazane, etc.

The inorganic filler content is preferably 10 to 20 mass%, and more preferably 12 to 20 mass%, based on the coating material. When the content of the inorganic filler is 10% by mass or more based on the coating material, sufficient mechanical strength can be easily imparted to the coating material. When the content of the inorganic filler is 20% by mass or less based on the coating material, sufficient fluidity can be easily imparted to the resin composition, the coating workability is good, the resin strength is sufficiently maintained, and sufficient adhesion can be easily ensured.

In the present invention, the viscosity of the coating material is preferably 10,000 to 50,000mPa · sec, more preferably 13,000 to 40,000mPa · sec, and particularly preferably 20,000 to 35,000mPa · sec. When the viscosity is 10,000mPa · sec or more, the resin is less likely to penetrate into the textile, and it becomes easy to secure a resin thickness necessary for achieving heat resistance. When the resin viscosity is 50,000mPa · sec or less, the coating amount can be easily adjusted appropriately. The coating material may be a solvent system or contain no solvent as long as its viscosity can be adjusted within the above range; in view of the influence on the environment, a coating material containing no solvent is preferable.

Other layers

One or more further layers may be provided between the textile and the coating. Examples of other layers include a layer containing an adhesion promoter provided for improving adhesion between the textile and the coating; and so on. A variety of adhesion aids may be used if desired. Examples of the adhesion promoter include amino-based silane coupling agents, epoxy-modified silane coupling agents, vinyl-based silane coupling agents, chlorine-based silane coupling agents, mercapto-based silane coupling agents, and the like.

Other Properties of the coated base Fabric for airbags

The coated base fabric for an airbag of the present invention may be a double-coated base fabric obtained by applying a coating to both sides of a woven fabric. However, a single-coated base fabric obtained by applying the coating material to only one side is more preferable in view of storability.

Method for producing coated base fabric for airbag

The method for manufacturing a coated base fabric for an airbag of the present invention comprises:

(1) a coating material comprising a thermally responsive foaming agent is disposed on at least one surface of the textile, either directly or with one or more other layers interposed therebetween.

The coating material may be, for example, a resin composition or the like. The resin is as described above.

The method for disposing the coating material may be a known method. Examples include methods for applying the coating material, such as blade coating, comma coating, die coating, gravure roll coating, kiss roll coating, spray coating, dip coating, and the like.

The amount of the thermally responsive foaming agent contained in the coating material can be appropriately determined in consideration of the heat resistance imparted by the thermally responsive foaming agent. The amount of the thermally responsive foaming agent is not particularly limited. In view of heat resistance, the coating material preferably contains a heat-responsive foaming agent in a total amount of 0.5 to 100 mass%, more preferably 1 to 50 mass%, and even more preferably 2 to 30 mass%, based on the coating material.

When the coating material such as the resin composition is continuously applied to the long woven fabric by blade coating, the tension of the base fabric in the traveling direction of the base fabric is preferably controlled in the range of 300 to 1,800N/m and preferably 500 to 1,600N/m. When the base fabric tension is 300N/m or more, the selvedges of the woven fabric are less likely to be bulky, a large difference in coating amount between the central portion and the edge portion of the base fabric is less likely to be caused, and a large thickness variation in the width direction can be easily avoided. When the base fabric tension is 1,800N/m or less, the balance of the crimp ratio between the warp and weft is not easily lost, the coating amount can be easily maintained within a specific range in the warp and weft directions, and a decrease in heat resistance can be easily avoided.

As a method for drying and curing the coating agent after coating, general heating methods such as hot air, infrared light, and microwaves can be used. From the viewpoint of cost, a hot air coating method is generally used. The heating temperature and time are not limited as long as a temperature high enough to cure the applied silicone resin is obtained. The heating temperature is preferably 150 to 220 ℃, and the heating time is preferably 0.2 to 5 minutes.

In a preferred embodiment, the coating is a porous body having closed pores and the step of obtaining such a coating comprises the step of expanding at least one member selected from the group consisting of: chemical blowing agents, expandable microcapsules and hollow microcapsules. These chemical blowing agents, expandable microcapsules and hollow microcapsules may be those mentioned above. This step may be performed simultaneously with step (1) or after step (1).

Coating composition

The coating composition of the present invention is used for coating of a coated base fabric for an airbag and contains a heat-responsive foaming agent.

The coating composition of the present invention is preferably used in a method for producing a coated base fabric for an airbag at a temperature lower than the foaming initiation temperature of a thermally responsive foaming agent. Coatings containing thermally responsive blowing agents can thus be obtained. When a thermally decomposable chemical blowing agent is used as the thermally responsive blowing agent, the composition is preferably used in a process for producing a coated base fabric for an airbag at a temperature lower than the thermal decomposition temperature of the blowing agent.

The coating composition of the present invention is used for producing a coating layer, and has the same constitution as that of the above-described coating material.