Water-soluble copolymer having alkyl-modified carboxyl group

C - Chemistry – Metallurgy – 08 – F

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C08F 220/06 (2006.01) C09K 3/00 (2006.01)

Patent

CA 2629081

Disclosed is a water-soluble copolymer having an alkyl-modified carboxyl group, which can form a viscous nutralizing solution having a satisfactorily high viscosity, an extremely high transmittance, no greasy feeling and a fresh texture even in the presence of a relatively high concentration of an electrolyte. Also disclosed is a thickening agent comprising the water-soluble copolymer. The water-soluble copolymer can be produced by polymerization of 100 parts by weight of (meth)acrylic acid, 5 to 10 parts by weight of lauryl (meth)acrylate and 0 to 0.1 part by weight of a compound having two or more ethylenically unsaturated groups. The water-soluble copolymer shows a viscosity of 1000 mPa~s or lower and a transmittance of 95% or higher when prepared into a viscous neutralizing solution containing 1% by weight of the water-soluble copolymer, and shows a maximum viscosity of 10000 to 30000 mPa~s and a transmittance of 95% or higher when 1 to 7 parts by weight of sodium chloride is added to 100 parts by weight of the viscous neutralizing solution.

La présente invention concerne un copolymère hydrosoluble ayant un groupe carboxyle modifié par un alkyle, qui peut former une solution de neutralisation visqueuse ayant une viscosité élevée de manière satisfaisante, une transmittance extrêmement élevée, pas de sensation de gras et une texture fraîche même en présente d~une concentration relativement élevée d~un électrolyte. L~invention concerne également un agent épaississant comprenant le copolymère hydrosoluble. On peut produire le copolymère hydrosoluble par polymérisation de 100 parties en poids d~acide (méth)acrylique, 5 à 10 parties en poids de (méth)acrylate lauryle et 0 à 0,1 partie en poids d~un composé ayant deux groupes éthyléniquement insaturés ou plus. Le copolymère hydrosoluble présente une viscosité de 1000 mPaûs ou moins et une transmittance de 95 % ou plus lorsqu~il est préparé en solution de neutralisation visqueuse contenant 1 % en poids du polymère hydrosoluble, et présente une viscosité maximale de 10 000 à 30 000 mPaûs et une transmittance de 95 % ou plus lorsqu~on ajoute 1 à 7 parties en poids de chlorure de sodium à 100 parties en poids de la solution de neutralisation visqueuse.

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