Polyester compositions with carbonyl-containing compounds

Claim 1

A process for the preparation of a polymerizable or copolymerizable composition which comprises incorporating into one or more polyesters containing a vinyl or vinylidene group and prepared by the polycondensation of an α,β-unsaturated monocarboxylic acid with a diol or polyol or epoxy compound, or a mixture comprising such a polyester and a monomer copolymerizable therewith and containing one or more vinyl or vinylidene groups, a free radical generating peroxidic initiator and a carbonyl containing compound having the formula: ##EQU2## wherein R 1 represents a hydrogen atom or a branched or unbranched alkyl, cycloalkyl, hydroxycarboalkylene, hydroxycarbocycloalkylene or hydroxycarboalkenylene group or a substituted aryl, aralkyl or hydroxycarboarylene group, R 2 is a hydrogen atom or hydroxyl, hydroxylperoxy, alkoxy or aryloxy group, or R 1 and R 2 together form a substituted or unsubstituted alkylenecarboxy, alkenylenecarboxy or arylenecarboxy group, in an amount sufficient to prevent the formation of gas during the polymerization or copolymerization of the composition.