GB580665A - Preparation of new polymerisable methacrylic esters and polymers and interpolymers thereof - Google Patents

Abstract

Methacrylates containing fluorine are prepared by reacting methacrylic acid, anhydride, acid chloride or methyl ester, with a primary or secondary saturated alcohol which contains 2, 3 or 4 carbons, one hydroxyl group and at last one fluorine atom not attached to the same carbon atom as the hydroxyl group and no other substituents, preferably in the presence of a strong acid and also a substance which inhibits polymerization such as pyrogallol, hydroquinone or tannic acid. The water, hydrogen chloride or methyl alcohol formed during the reaction may be removed, for example, by evaporation. The products of the invention may be polymerized alone or with other polymerizable materials, dyes, plasticisers or polymerization inhibitors. In the examples: (1) 2 : 2 : 2-trifluoroisopropanol, methacrylyl chloride and hydroquinone are reacted together to give trifluoroisopropyl methacrylate which is polymerized by means of heat in the presence of benzoyl peroxide; (2) trifluoroethyl methacrylate is prepared from 2 : 2 : 2-trifluoroethanol, methacrylyl chloride and pyrogallol and is polymerized as in (1); (3) fluoroethyl methacrylate is prepared from monofluoroethanol, methacrylyl chloride and pyrogallol and polymerized as above. The preferred polymerization catalysts are lauryl-, succinic-, benzoyl-, ethylhydrogen-, acetone- or diethylperoxides, benzoin, diacetyl or uranyl acetate and nitrate.