Patent ID: 8389645
Filing Date: 2013-03-05
Classification: C08F,C09D

Abstract:
1. A process for the preparation of solid polyester granules comprising: (i) preparing a solution of unsaturated polyester and a combination of diacyl peroxides in styrene, wherein the combination of diacyl peroxides comprises diaroyl peroxide and dialkanoyl peroxide having a diaroyl peroxide to dialkanoyi peroxide mole ratio that ranges from 1:1 to 10:1, (ii) emulsifying said solution in water to provide a stabilised oil-in-water emulsion, (iii) adding to said emulsion an aromatic amine of formula (I): where R R Ar is an optionally substituted aryl group, such that reaction of said aromatic amine of formula (I) with each of the diaroyl and dialkanoyl peroxides generates a radical flux capable of initiating polymerisation of the unsaturated polyester and the styrene, wherein a slurry of polyester granules prepared by the process has a residual free styrene level of less than 1000 ppm.