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Alkyl-modified carboxyl group-containing copolymer, thickener containing said copolymer, and method for preparing said copolymer

A technology of alkyl modification and copolymer, which is applied in medical preparations containing active ingredients, preparations for skin care, chemical instruments and methods, etc. Insufficient properties, etc., to achieve the effect of excellent dispersibility and high transparency

Active Publication Date: 2020-04-17
SUMITOMO SEIKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this copolymer has insufficient solubility in water, and the viscosity difference of the neutralized viscous liquid is very large regardless of the presence or absence of an electrolyte, making it difficult to control the viscosity.

Method used

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  • Alkyl-modified carboxyl group-containing copolymer, thickener containing said copolymer, and method for preparing said copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] In a four-neck flask with a capacity of 500 mL (milliliters) equipped with a stirrer, a thermometer, a nitrogen gas blowing tube, and a condenser tube, 45 g of acrylic acid and an alkyl (meth)acrylate having 18 to 24 carbon atoms as an alkyl group were added. BLEMMER VMA70 (manufactured by NOF Corporation, 10-20 parts by mass of stearyl methacrylate, 10-20 parts by mass of eicosyl methacrylate, 59-80 parts by mass of behenyl methacrylate, and 59-80 parts by mass of behenyl methacrylate) 1.35 g of tetracosyl acrylate content of 1% by mass or less), 0.116 g of 2,2'-azobis(methyl isobutyrate) as a radical polymerization initiator, and 230.9g of n-hexane. Next, after stirring and mixing the solution uniformly, nitrogen gas was blown into the solution in order to remove oxygen present in the upper space of the reaction container (four-necked flask), the raw materials, and the reaction solvent. Next, the solution was heated to 60-65° C. under a nitrogen atmosphere. Two hour...

Embodiment 2

[0077] In Example 1, when adding the raw material before heating, 0.0045 g of pentaerythritol polyallyl ether as a compound having at least two ethylenically unsaturated groups was added, and the procedure was carried out in the same manner as in Example 1, 43 g of white fine particles of the alkyl-modified carboxyl group-containing copolymer were obtained.

Embodiment 3

[0079] In Example 2, BLEMMER VMA70 (manufactured by NOF Corporation, 10 to 20 parts by mass of stearyl methacrylate, 10 to 20 parts by mass of eicosyl methacrylate of behenyl methacrylate was 59 to 80 parts by mass and a mixture with a content of tetracosyl methacrylate of 1 mass % or less) was changed to 1.575 g, and the block of 12-hydroxystearic acid and polyethylene oxide Except having changed the usage-amount of a copolymer (manufactured by Croda, Hypermer B246) to 1.575 g, it carried out similarly to Example 2, and obtained 42 g of white fine particles of an alkyl-modified carboxyl group-containing copolymer.

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PUM

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Abstract

Provided is an alkyl-modified carboxyl group-containing copolymer with which a neutralized viscous liquid can be prepared which has excellent dispersibility in water, has a viscosity that does not change greatly regardless of addition of an electrolyte, and has high transparency in the presence of an electrolyte. This alkyl-modified carboxyl group-containing copolymer contains: 100 parts by mass of a (meth)acrylic acid; 1.5-4.5 parts by mass of a (meth)acrylic acid alkyl ester, in which an alkyl group has 18-24 carbon atoms; and 0-0.1 parts by mass of a compound having two or more ethylenically unsaturated groups, wherein the copolymer contains 1.5-4.5 parts by mass of a nonionic surfactant.

Description

technical field [0001] The present invention relates to an alkyl-modified carboxyl group-containing copolymer, a tackifier comprising the copolymer, and a method for producing the copolymer. Background technique [0002] Conventionally, various copolymers are known as copolymers of (meth)acrylic acid and alkyl (meth)acrylates used in thickeners for cosmetics, humectants for poultices, emulsifiers, and suspension stabilizers. For example, a copolymer ( Refer to Patent Document 1); obtained by reacting a specific amount of olefinic unsaturated carboxylic acid monomer, a specific amount of alkyl (meth)acrylate (the number of carbon atoms in the alkyl group is 8 to 30) and a crosslinking agent Copolymer (see Patent Document 2) and the like. These copolymers of (meth)acrylic acid and alkyl (meth)acrylates are usually dissolved in water, etc., and then neutralized with an alkali to form a neutralized viscous liquid of about 0.1 to 1% by mass. for the above purposes. [0003] W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06B01F17/52C08L33/02C09K3/00C09K23/52
CPCC08F220/06C08L33/02C09K3/00C08F2/08A61K2800/48A61K8/8152A61K2800/10A61Q19/00C08F220/1818C08F216/125C08F220/10C08L2201/10
Inventor 清本梨绘西口慧村上亮辅桥本直幸
Owner SUMITOMO SEIKA CHEM CO LTD
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