Hydrophilic polymers and methods of preparation

   
   

The present invention provides a method for the preparation of hydrophilic water insoluble, gel-free copolymers of 2-hydroxyethyl methacrylate and at least one of acrylic acid or methacrylic acid, and 2-hydroxyethyl methacrylate, 4-hydroxybutyl acrylate and acrylic or methacrylic acid, where the copolymers are prepared in a solution of water and alcohol using monomeric 2-hydroxyethyl methacrylate containing ethylene glycol dimethacrylate impurities up to about 0.15% by weight and substantially in the absence of a chain transfer agent. The copolymers are convertible to water soluble copolymers by pH adjustment. The invention also provides a method for the preparation of a copolymer of 2-hydroxyethyl methacrylate and 4-hydroxybutyl acrylate, and a homopolymer of 2-hydroxyethyl methacrylate in a solution of water and either a monoalcohol or a polyhydric alcohol. The polymers are useful in topical skin applications, including use as cosmetic compositions, dermatological compositions, and flexible skin coatings, and as pressure sensitive adhesives.

A invenção atual fornece um método para a preparação de copolymers insoluble, gel-livres hydrophilic da água do methacrylate 2-hydroxyethyl e ao menos de um do ácido acrílico ou do ácido methacrylic, e de methacrylate 2-hydroxyethyl, de acrylate 4-hydroxybutyl e do ácido acrílico ou methacrylic, onde os copolymers são preparados em uma solução da água e do álcool usando o methacrylate 2-hydroxyethyl monomeric que contem impurezas do dimethacrylate do glicol de etileno até aproximadamente 0.15% pelo peso e substancialmente na ausência de um agente de transferência chain. Os copolymers são convertible molhar copolymers soluble pelo ajuste do pH. A invenção fornece também um método para a preparação de um copolymer acrylate de methacrylate 2-hydroxyethyl e de 4-hydroxybutyl, e um homopolymer do methacrylate 2-hydroxyethyl em uma solução da água e um monoalcohol ou um álcool polyhydric. Os polímeros são úteis em aplicações tópicas da pele, including o uso como composições cosmetic, em composições dermatological, e em revestimentos flexíveis da pele, e como adesivos sensíveis da pressão.

 
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