阅读说明：本技术 至少一种苯酚衍生物的新型固体呈现形式及其获得方法 (Novel solid presentation form of at least one phenol derivative and method for obtaining same ) 是由 R·萨佩-特里姆菲 C·胡姆布洛 于 2019-08-02 设计创作，主要内容包括：本发明涉及苯酚衍生物的一种新型固体呈现形式,其特征在于圆形部分和平坦部分。由此获得的组合物具有适于化合物的储存、搬运和流通的有利特性。本发明还涉及一种用于制备这些固体的方法,以及其用途,尤其是在聚合物和农产食品工业中的用途。(The present invention relates to a novel solid presentation form of a phenol derivative characterized by a rounded portion and a flat portion. The compositions thus obtained have advantageous properties for the storage, handling and circulation of the compounds. The invention also relates to a method for producing said solids and to the use thereof, in particular in the polymer and agrofoods industries.)

1. A novel solid presentation form comprising at least one compound of formula (I)

Wherein:

n is between 0 and 5, preferably between 0 and 4, and preferably n is equal to 0, 1 or 2,

-R₁selected from the group consisting of hydrogen, alkyl and alkenyl, preferably R₁Selected from the group consisting of hydrogen, methyl and ethyl,

-R₂selected from the group consisting of hydroxy, alkyl, alkenyl, alkynyl, alkoxy, formyl and acetyl, preferably R₂Selected from the group consisting of hydroxy, methyl, ethyl, propyl, methoxy, ethoxy and formyl,

and it comprises at least one circular portion and one flat portion.

2. The novel solid presentation form according to claim 1, characterized in that said compound of formula (I) is selected from the group consisting of: hydroquinone, catechol, resorcinol, pyrogallol, 4-tert-butylcatechol, tert-butylhydroquinone, p-methoxyphenol, butyl hydroxyanisole, vanillin, ethyl vanillin, and a mixture of vanillin to ethyl vanillin in a molar ratio of 2.

3. Pellets of at least one compound of formula (I)

Wherein:

n is between 0 and 5, preferably between 0 and 4, and preferably n is equal to 0, 1 or 2,

-R₁selected from the group consisting of hydrogen, alkyl and alkenyl, preferably R₁Selected from the group consisting of hydrogen, methyl and ethyl,

-R₂selected from the group consisting of hydroxy, alkyl, alkenyl, alkynyl, alkoxy, formyl and acetyl, preferably R₂Selected from the group consisting of hydroxy, methyl, ethyl, propyl, methoxy, ethoxy, and formyl.

4. Spherical cap of at least one compound of formula (I)

Wherein:

n is between 0 and 5, preferably between 0 and 4, and preferably n is equal to 0, 1 or 2,

-R₁selected from the group consisting of hydrogen, alkyl and alkenyl, preferably R₁Selected from the group consisting of hydrogen, methyl and ethyl,

-R₂selected from the group consisting of hydroxy, alkyl, alkenyl, alkynyl, alkoxy, formyl and acetyl, preferably R₂Selected from the group consisting of hydroxy, methyl, ethyl, propyl, methoxy, ethoxy, and formyl.

5. A process for the preparation of the novel solid presentation forms, pellets or spherical caps comprising at least one compound of formula (I) as claimed in claims 1 to 4, comprising at least the following successive steps:

(a) wherein a droplet comprising at least one compound of formula (I) is arranged on a flat surface,

(b) a step of solidifying the droplet on the surface.

6. The process for preparing a novel solid presentation form as claimed in claim 5, wherein the planar surface is a belt, plate or disk.

7. The preparation process according to claims 5 to 6, further comprising, before step (a), a step (a1) in which the at least one compound of formula (I) is heated to a temperature between 1 ℃ and 50 ℃ above its melting point, preferably between 1 ℃ and 20 ℃ above its melting point, and more preferentially between 1 ℃ and 10 ℃ above its melting point.

8. The production method according to any one of claims 5 to 7, prior to step (a), the method comprising a step (a2) comprising forming droplets.

9. The method of any one of claims 5 to 8, wherein the flat surface is cooled to a temperature strictly below the melting point of the compound of formula (I) to allow solidification of the droplets.

10. The process according to any one of claims 5 to 9, which is carried out in air, under oxygen, oxygen-depleted air, controlled atmosphere, inert atmosphere, in particular under nitrogen.

11. A novel solid presentation form, pellet or spherical cap comprising at least one rounded part and one flat part, comprising at least one compound of formula (I)

Wherein:

n is between 0 and 5, preferably between 0 and 4, and preferably n is equal to 0, 1 or 2,

-R₁selected from the group consisting of hydrogen, alkyl and alkenyl, preferably R₁Selected from the group consisting of hydrogen, methyl and ethyl,

-R₂selected from the group consisting of hydroxy, alkyl, alkenyl, alkynyl, alkoxy, formyl and acetyl, preferably R₂Selected from the group consisting of hydroxy, methyl, ethyl, propyl, methoxy, ethoxy and formyl,

obtainable according to the process of claims 5 to 10.

12. Use of the novel solid presentation form, pellet or spherical cap as claimed in claims 1 to 4 in industry, in particular in polymer, agro-food, perfumery or pharmaceutical industry.

Technical Field

The present invention relates to novel solid presentation forms of at least one phenol derivative having at least one rounded portion and one flat portion. The invention also describes a method for preparing these solids having at least one rounded portion and one flat portion. The invention also relates to the solids obtained by the preparation process.

Background

Phenol derivatives, such as vanillin, ethyl vanillin, hydroquinone, catechol, p-methoxyphenol, are present in many industrial fields. For example, they are used as flavoring agents in the agrofoods industry or as polymerization inhibitors in the polymer industry.

These compounds are currently sold primarily in powder form. Document WO 2016/033157 describes a process for forming hydroquinone in the form of a crystalline powder. The powder consists of small, brittle needles, as a result of which a considerable amount of fine powder is present, which poses problems, inter alia, with regard to its storage, handling and transport. The caking resistance of the product is indeed slightly improved, but there is a risk of irritation of the handling of the compound, especially to the eyes, the respiratory system or the skin.

Alternatives have been proposed. Document JP 2000/302716 describes a granulation technique which comprises passing a powder between two rollers, so that slabs can be obtained, and then crushing these slabs to obtain granules. A disadvantage of this method is that dust may remain either by the rollers of the compactor or by the wear of the slab in the crusher. Furthermore, the granules are dense and their dissolution rate is very low compared to the starting powder.

Documents EP 0689772 and WO 2004/039758 describe the shaping of phenolic compounds, in particular hydroquinone and vanillin, in the form of beads by a granulation process. These beads are highly spherical. This particular presentation gives the beads advantageous abrasion resistance properties and will therefore avoid the formation of large amounts of dust. The granulation process for preparing these compounds involves cooling droplets of the phenolic compounds in a gas stream to solidify them. For some specific applications, the dissolution rate of these beads may be increased.

Furthermore, while these alternative methods have recognized advantages, these methods are expensive. It is therefore desirable to propose other alternatives, which are less economically affected, while maintaining good storage, handling, transport, abrasion and caking resistance properties, while reducing health and environmental related risks by minimizing the presence of dust and fines and improving the solubility properties of these presentation forms.

Disclosure of Invention

It is worth mentioning that the applicant company has identified a new solid presentation form which exhibits all the above-mentioned desired characteristics and in particular good solubility characteristics, while maintaining good abrasion resistance characteristics.

A first aspect of the present invention relates to a novel solid presentation form comprising at least one compound of formula (I)

Wherein:

n is between 0 and 5, preferably between 0 and 4, and preferably n is equal to 0, 1 or 2,

-R₁selected from the group consisting of hydrogen, alkyl, and alkenyl, preferably R₁Selected from the group consisting of hydrogen, methyl and ethyl,

-R₂selected from the group consisting of hydroxy, alkyl, alkenyl, alkynyl, alkoxy, formyl and acyl, preferably R₂Selected from the group consisting of hydroxy, methyl, ethyl, propyl, methoxy, ethoxy and formyl,

and it comprises at least one circular portion and one flat portion.

According to another aspect, the present invention relates to a process for the preparation of a novel solid presentation form comprising at least one compound of formula (I), said process comprising at least the following steps:

(a) wherein a droplet comprising at least one compound of formula (I) is arranged on a flat surface,

(b) a step of solidifying the droplet on the surface.

Finally, the present invention relates to novel solids obtainable by the process of the invention. Finally, the invention relates to the use of these novel solids in industry.

Drawings

Fig. 1 and 2 show two cross-sectional views of an embodiment of a solid compound according to the invention.

Fig. 3 shows a top or bottom view of a solid compound according to the invention.

FIG. 4 is a photograph (optical microscope, 6.3 times magnification) of pellets of p-methoxyphenol according to the present invention obtained on a stainless steel surface.

Fig. 5 is a photograph (optical microscope, 6.3 times magnification) of pellets of p-methoxyphenol according to the present invention obtained on a PTFE-coated surface.

Detailed Description

In the context of the present invention, and unless otherwise specified, the expression "between … … and … …" includes the limit values.

In the context of the present invention, and unless otherwise specified, the expression "alkyl" denotes a straight or branched saturated hydrocarbon chain comprising from 1 to 6 carbon atoms.

In the context of the present invention, and unless otherwise indicated, the expression "alkoxy" denotes OR, wherein R is alkyl as defined above.

In the context of the present invention, and unless otherwise specified, the expression "alkenyl" denotes a straight or branched unsaturated hydrocarbon chain comprising from 1 to 6 carbon atoms and having at least one double bond between two carbon atoms.

In the context of the present invention, and unless otherwise specified, the expression "alkynyl" denotes a linear or branched unsaturated hydrocarbon chain comprising from 1 to 6 carbon atoms and having at least one triple bond between two carbon atoms.

In the context of the present invention, the term "comprising" may have the meaning of "consisting of … …".

In the context of the present invention, the term "ambient temperature" means a temperature between 19 ℃ and 24 ℃, preferably the ambient temperature is equal to 20 ℃.

According to a first aspect, the present invention relates to a novel solid presentation form comprising at least one compound of formula (I)

Wherein:

n is between 0 and 5, preferably between 0 and 4, and preferably n is equal to 0, 1 or 2,

-R₁selected from the group consisting of hydrogen, alkyl and alkenyl,

-R₂selected from the group consisting of hydroxyl, alkyl, alkenyl, alkynyl, alkoxy, formyl and acyl, and which comprises at least one rounded portion and one flattened portion.

According to a preferred aspect, R₁Selected from hydrogen, methyl and ethyl. According to another preferred aspect, R₂Selected from the group consisting of hydroxy, methyl, ethyl, propyl, methoxy, ethoxy, and formyl.

According to a preferred aspect of the present invention, wherein n ═ 2, R₂The radicals being identical OR different with respect to OR₁The groups are placed, one in ortho and the other in para position.

According to another aspect of the invention, wherein n-1, R₂The radicals being situated opposite to OR₁Ortho or para to the group.

According to a preferred aspect, the compound of formula (I) is selected from the group consisting of: hydroquinone, catechol, resorcinol, pyrogallol, 4-tert-butylcatechol, tert-butylhydroquinone, p-methoxyphenol, butyl hydroxyanisole, vanillin, ethyl vanillin, and a mixture of vanillin to ethyl vanillin in a molar ratio of 2. Preferably, the compound of formula (I) is selected from the group consisting of: hydroquinone, catechol, resorcinol, pyrogallol, 4-tert-butylcatechol, tert-butylhydroquinone, p-methoxyphenol and butyl hydroxyanisole. Alternatively, the compound of formula (I) is selected from the group consisting of: vanillin, ethyl vanillin and a mixture of vanillin to ethyl vanillin molar ratio of 2.

According to a preferred embodiment, the compound of formula (I) is a polymerization inhibitor.

According to another preferred embodiment, the compound of formula (I) is a flavoring agent.

According to one aspect of the invention, the novel solid presentation form may comprise one, two or three compounds of formula (I) as defined above, preferably the novel solid presentation form according to the invention comprises a compound of formula (I) or a mixture of two compounds of formula (I).

In case the novel solid presentation form according to the invention comprises 2 compounds of formula (I), the molar ratio between these 2 compounds is between 1:99 and 99: 1. According to a particular aspect, the molar ratio between the two compounds is 1:1 or 2: 1.

In the case where the novel solid presentation form according to the invention comprises 2 compounds of formula (I), the mass ratio is strictly greater than 0% by weight, preferably greater than or equal to 0.1% by weight, more preferentially greater than or equal to 5% by weight and strictly less than 100% by weight.

According to a particular aspect, the novel solid presentation form according to the invention may comprise at least one additive selected from the group consisting of: an antioxidant, a defoaming agent, an antiseptic, a rust inhibitor, a surfactant, a detergent, a dispersant, an antifouling agent, a diluent, a tackifier, or an acidity regulator.

According to a particular aspect, the novel solid presentation forms according to the invention may comprise at least one selected from the group consisting ofA compound of the group: tocopherol derivatives, preferably alpha-tocopherol, beta-tocopherol, gamma-tocopherol, delta-tocopherol, copper complexes in the oxidation state 2, preferably copper acetate (Cu (OAc)₂) Or copper dibutyldithiocarbamate (CB), 2-sec-butyl-4, 6-dinitrophenol, phenylenediamine, TEMPO, TEMPO-OH, 2, 4-dimethyl-6-tert-butylphenol (Topanol A), phenothiazine, Butylhydroxyanisole (BHA) and 2, 6-di-tert-butyl-4-methoxyphenol (DTBHA).

Advantageously, the novel solid presentation form according to the invention comprises:

-between 50% and 100% by weight of at least one compound of formula (I) as defined above, and

-between 0% and 50% by weight of at least one compound selected from the group consisting of: tocopherol derivatives, preferably alpha-tocopherol, beta-tocopherol, gamma-tocopherol, delta-tocopherol, copper complexes in the oxidation state 2, preferably copper acetate (Cu (OAc)₂) Or copper dibutyldithiocarbamate (CB), 2-sec-butyl-4, 6-dinitrophenol, phenylenediamine, TEMPO, TEMPO-OH, 2, 4-dimethyl-6-tert-butylphenol (Topanol A), phenothiazine, Butylhydroxyanisole (BHA) and 2, 6-di-tert-butyl-4-methoxyphenol (DTBHA).

According to another particular aspect, the novel solid presentation form according to the invention may comprise at least one additive selected from the group consisting of: fatty substances, waxes, sugars, polysaccharides such as starch, maltodextrin and antioxidants.

The novel solid presentation form according to the invention can be schematically represented as shown in fig. 1 and 2. Distance d1 represents the maximum distance between two points a and B of the flat portion of the novel solid presentation form. The distance d2 represents the maximum distance between the flat portion and the rounded portion. The novel solid presentation form of the invention can be likened to a spherical cap.

The rounded portion of these novel solid presentation forms is preferably spherical, however it may have drawbacks. The novel solid presentation forms according to the invention can be described as pellets.

According to the invention, the novel solid form has at least one rounded portion and one flat portion. Thus, according to the present invention, the novel solid form has edges.

According to certain aspects of the present invention, the flat portion (top or bottom view as schematically shown in fig. 3) of the novel solid presentation form may have a shape similar to a disk or an ellipse.

The volume of the spherical cap can be calculated according to the following formula:

where d1 is the diameter of the spherical cap (see FIG. 3) and d2 is the thickness of the spherical cap.

The novel solid forms according to the invention can therefore be compared with a portion of a sphere of radius r (V ═ 4 tr ═ r)³/3) or a portion of an ellipsoid (V ═ 4 pi abc/3, where a, b, and c are the lengths of the half-axes of the ellipsoid). The volume of this portion can thus be measured according to the following formula:

or

Where x is strictly greater than 0, preferably greater than or equal to 0.01, and more preferentially greater than or equal to 0.02, and x is strictly less than 1, preferably less than or equal to 0.9, more preferentially less than or equal to 0.8. According to a particular aspect, x may be between 0.01 and 0.1.

According to a particular aspect of the invention, d1 and d1', which are identical or different, are between 300 μm and 10000 μm, preferably between 500 μm and 5000 μm, more preferentially between 500 μm and 2000 μm; d2 is between 50 μm and 10000 μm, preferably between 75 μm and 5000 μm and more preferably between 75 μm and 2000 μm.

According to the invention, the flat part of the novel solid form is a continuous surface. Preferably, the flat surface represents at least 5%, preferably at least 10%, 15%, 20%, 25%, 30%, 40%, 50% of the total surface of the novel solid form according to the invention. Preferably, the flat surface represents at most 95%, preferably at most 90%, 85%, 80%, 75%, 70%, 60%, 55% of the total surface of the novel solid form according to the invention.

The invention also relates to a process for preparing the novel solid presentation forms as defined above by a granulation process. Documents US 2017/0326760 and EP 1042056 propose two apparatuses suitable for preparing the pellets according to the invention.

According to a particular aspect, the method comprises at least the following steps:

(a) wherein a droplet comprising at least one compound of formula (I) is arranged on a flat surface,

(b) a step of solidifying the droplet on the surface.

Step (a) is a step of disposing the liquid droplet on a flat surface. In the context of the present invention, the planar surface may be a strip, a plate or a disc. Preferably, the belt or disc is in motion.

The belt may be a conveyor belt rotating around two rollers. The belt performs a translational movement. The droplets are arranged in the upper part of the conveyor belt.

Alternatively, the disc may rotate about an axis. Preferably, the axis of rotation is perpendicular to the ground. The droplets are arranged on the surface of the disc, preferably the upper surface.

Advantageously, the process of the invention further comprises, before step (a), a step (a1) wherein at least one compound of formula (I) is melted. During step (a1), at least one compound of formula (I) is heated to a temperature between 1 ℃ and 50 ℃ above its melting point, or in the case of a mixture, the melting point of the compound with the highest melting point, preferably between 1 ℃ and 20 ℃ above its melting point, or the melting point of the compound with the highest melting point, and more preferably between 1 ℃ and 10 ℃ above its melting point, or the melting point of the compound with the highest melting point. Generally, the heating temperature may be between 50 ℃ and 300 ℃, preferably between 50 ℃ and 260 ℃.

One additive or several additives as defined above may be added to the preparation of the compound in molten form.

The method of the present invention may further comprise the step (a2) comprising forming droplets. The droplet forming means may be a perforated cylinder or a perforated plate. The droplet-forming apparatus is preferably maintained at a temperature higher than or equal to the temperature of step (a 1). Preferably, the droplet forming means is located above the planar surface so that the droplets can land on the planar surface.

According to a particular aspect, step (a1) is performed before step (a 2). According to another aspect, the droplet formation step (a2) is carried out directly at the end of the process for the preparation or purification of the compound of formula (I). In this example, the compound of formula (I) is in liquid form, and no step of melting the compound of formula (I) is required.

The step (b) is a step of solidifying the droplet on the flat surface. Advantageously, the flat surface is cooled to a temperature strictly below the melting point of the compound of formula (I), or in the case of a mixture, of the compound of formula (I) having the lowest melting point. Advantageously, the flat surface is cooled to a temperature between-50 ℃ and a temperature strictly below the melting point of the compound of formula (I), or in the case of a mixture, strictly below the melting point of the compound of formula (I) with the lowest melting point, preferably to a temperature between 0 ℃ and a temperature strictly below the melting point of the compound of formula (I), or in the case of a mixture, strictly below the melting point of the compound of formula (I) with the lowest melting point, and more preferentially to a temperature between 10 ℃ and a temperature strictly below the melting point of the compound of formula (I), or in the case of a mixture, strictly below the melting point of the compound of formula (I) with the lowest melting point. Preferably, the flat surface is cooled to a cooling temperature between 10 ℃ and ambient temperature.

According to a particular aspect of the invention, the cooling temperature of the flat surface is uniform over the entire flat surface. According to another particular aspect, the cooling temperature is not uniform across the flat surface, and the temperature may have a cooling gradient or cooling area where the flat surface is cooled to a different cooling temperature.

According to a particular aspect, the flat surface may have been subjected to a surface treatment prior to the method according to the invention. The flat surface may also be particularly coated with a non-stick or hydrophobic coating, such as PTFE (polytetrafluoroethylene). The flat surface may also have a roughness. These treatments or roughnesses make it possible in particular to improve the separation of the novel solid forms according to the invention at the end of the process. These treatments or roughnesses also make it possible to improve the mechanical properties of the novel solid forms according to the invention, in particular a better resistance to embrittlement during handling operations. The shape of the solid according to the invention also makes it possible to reduce the caking phenomenon.

At the end of the solidification step (b), the novel solid presentation form according to the invention can be attached to a flat surface. The method according to the invention may comprise the step of removing the novel solid presentation form from the flat surface. The means for forming the novel solid presentation form according to the invention may comprise a knife or scraper.

According to a particular aspect of the invention, the process can be carried out in air, under oxygen, or under a controlled atmosphere, in particular the degree of humidity can be controlled. The process according to the invention can be carried out under dry air, under an inert atmosphere, in particular under nitrogen.

At the end of the process according to the invention, the content of fine particles having a size of less than or equal to 355 μm is less than or equal to 30%, preferably less than or equal to 20%, more preferentially less than or equal to 10%, and even more preferentially less than or equal to 0.1% by weight relative to the weight of the novel solid presentation form of formula (I).

The method according to the invention may also comprise a step of separating the fine particles having a size of less than or equal to 355 μm by screening or by cyclonic separation. The fine particles may be recycled.

The novel solid compounds according to the invention have a hardness of at least 1N. Hardness can be measured with a penetrometer.

Advantageously, the novel solid compounds according to the invention have a friability of less than or equal to 15%. This parameter allows easier handling of these new solid compounds compared to powders, since the formation of mist is avoided or at least reduced. Friability can be measured by mixing the novel solid presentation form according to the invention in a tri-axial mixer for 10 minutes, and then by measuring the content of particles produced which are smaller than 100 μm. Friability represents the ratio between the mass of the particles produced, less than 100 μm, and the total mass of the novel solid presentation form introduced into the tri-axial mixer.

The novel solid presentation forms according to the invention have good dissolution properties. The dissolution rate of these solids is at least equal to, preferably better than, the dissolution rate of the other existing forms of the compound of formula (I).

The chemical composition of the novel solid presentation forms according to the invention depends on the liquid composition as defined above.

The addition of the additives as defined above in the novel solid presentation form according to the invention can be carried out during the preparation of the composition comprising at least one compound of formula (I) in liquid form (step (a1)) or during an additional step at the end of the process.

The novel solid presentation forms comprising at least one compound of formula (I) as defined above, which can be obtained according to the process of the invention, are also a subject of the present invention.

Finally, the present invention relates to the use of these novel solid presentation forms comprising at least one compound of formula (I) in industry, in particular in the polymer, agro-food, perfumery or pharmaceutical industry.

Examples of the invention

Pellets of p-methoxyphenol (PMP) were prepared. The PMP was first melted at 80 ℃. Droplets were then formed and deposited on a belt cooled to 18 ℃.

Fig. 4 and 5 show pellets according to the invention.

Example 1: the pellets of fig. 4 were obtained on a stainless steel belt.

Example 2: the pellets of fig. 5 were obtained on a PTFE coated tape.

The blocking resistance was visually observed after storing the samples at 35 ℃ for 7 days.

The dissolution rate corresponds to the time required to dissolve 90% of 2g of pellets/powder/flakes in 100g of water/acrylic acid at 20 ℃ under stirring at 300 rpm.