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Copolymer

A water-soluble copolymer, general formula technology, applied in the fields of sunscreen cosmetics and skin cleansing milk, can solve the problems of viscosity drop, discoloration, difficulty in obtaining the quality of emulsion-like foam, etc., and achieve the effect of less viscosity

Active Publication Date: 2020-06-26
POLA CHEM INDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the skin cleansing milk using the potassium salt of higher fatty acid as the main component has such excellent properties, it also has such problems on the other hand: it is difficult to obtain the quality of emulsion-like foam, and the skin is prone to excessive degreasing during cleansing, and soap stains (Froth) remains on the skin, and the skin tends to become tight after use
However, when a large amount of ultraviolet absorber is blended, there are problems such as discoloration, poor diffusibility, stickiness, and poor usability.
In addition, when a large amount of metal oxide powder is prepared, there is a problem that not only aggregation and sedimentation of the powder occur over time, but also a decrease in viscosity, emulsification separation, precipitation, etc. The stability over time decreases.
[0043] As mentioned above, although the oil agent has a good feeling of elasticity, it also has problems such as stickiness

Method used

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Examples

Experimental program
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Embodiment

[0884] Synthesis of hydrophobic monomer

[0885] Production examples of the hydrophobic monomer represented by the general formula (1) are shown below.

manufacture example 1

[0886] (Production Example 1) Synthesis of Glyceryl Monoacrylate

[0887] In a 3L four-necked flask, 79.5 g of R)-(+)-2,2-dimethyl-1,3-dioxolane-4-methanol (manufactured by Tokyo Chemical Industry Co., Ltd.) and acrylic acid 258.0 g of methyl ester and 3.7 g of titanium tetramethoxide. Thereafter, the reaction liquid was stirred, and a transesterification reaction was performed at 105 to 110° C. for 2.5 hours while nitrogen gas was introduced into the liquid. After completion of the reaction, acrylic acid ketal 1 (intermediate 1) was obtained by fractional distillation using vacuum distillation.

[0888] Into a 3 L four-necked flask, 90.2 g of water, 28.4 ml of cation exchange resin RCP 160M (manufactured by Mitsubishi Chemical Corporation), and 94.2 g of Intermediate 1 were charged. Then, the reaction liquid was stirred, and a deketalization reaction of the ketal was performed at 24° C. for 27 hours while nitrogen gas was introduced into the liquid. After the reaction, the...

manufacture example 2

[0889] (Production Example 2) Synthesis of Trimethylolpropane Monoacrylate

[0890] Operation (1): Add 145.7g trimethylolpropane, 300ml acetone, 3g p-toluenesulfonic acid monohydrate and 300mL petroleum ether to the eggplant-shaped flask equipped with calcium tube, cooling tube and Dean-Stark water trap, The mixture was heated to reflux in an oil bath set at 50 °C. After 12 hours, after confirming that water was not newly formed, the reaction mixture was cooled to room temperature. Then, after adding 3 g of sodium acetate and stirring for 30 minutes, petroleum ether and acetone were distilled off with an evaporator. Ketalized trimethylolpropane (intermediate 2) was obtained by distilling the obtained crude product under reduced pressure.

[0891] Step (2): 104.8 g of the intermediate 2 obtained in the step (1), 258.0 g of methyl acrylate, and 3.7 g of tetramethoxytitanium were added to a 3 L four-necked flask. Thereafter, the reaction liquid was stirred, and a transesterifi...

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Abstract

The present invention addresses the problem of providing a novel copolymer having an elastic feeling. A copolymer having a weight-average molecular weight of 20,000-110,000, having one or more types of constituent units (a) derived from a hydrophobic monomer having a specific structure, and one or more types of constituent units (b) derived from a hydrophilic monomer represented by general formula(2) as essential constituent units.

Description

[0001] This application is a divisional application of the Chinese invention patent application No. 201680028097.4 with the filing date of May 11, 2016 and the title of the invention being "copolymer". The Chinese invention patent application is based on the international application PCT / JP2016 / 064071 and requires the Priority of Japanese Patent Application No. 2015-106260 filed May 26, 2015, which is hereby incorporated by reference in its entirety. technical field [0002] The present invention relates to novel copolymers, namely copolymers of hydrophobic monomers and hydrophilic monomers. [0003] Furthermore, the present invention relates to an emulsified composition emulsified with a water-soluble copolymer. [0004] Also, the present invention relates to a skin cleansing milk comprising a water-soluble copolymer. [0005] Also, the present invention relates to a sunscreen cosmetic comprising a water-soluble copolymer. [0006] Furthermore, the present invention relates...

Claims

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Application Information

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IPC IPC(8): A61K8/81A61K8/04A61Q19/10C08F220/28
CPCA61K8/06A61K8/8141A61K2800/54A61Q19/00C08F220/28A61K8/042A61Q19/10A61K8/062A61K8/85A61Q17/04A61K8/73A61K8/8135A61K8/8147A61K8/817A61K8/86A61K8/88A61K2800/10A61K8/81C08F220/286
Inventor 堀江亘竹山雄一郎加治惠仁王厚志露木萌佐藤纱弥香
Owner POLA CHEM INDS
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