| 摘要 |
A composition and method for the polymerization of polymerizable resins which undergo exothermic polymerization, including unsaturated polyester resins, vinyl ester resins and mixtures thereof, and the polymerized product thereof, wherein an ester of a thiocarboxylic acid is present in an effective amount to substantially reduce the exothermic heat generated during polymerization of the resin, but insufficient to substantially affect the degree or rate of polymerization of the resin. The preferred thioester has the formula <See formula I) in which Z is an alkyl having 1-18 carbon atoms or <See formula II> a is 1 or 2, b is a whole number from 1 to about 5, n is a whole number from zero to b, and R is an alkyl or hydroxyalkyl having 1-18 carbon atoms and zero to 2 hydroxyl groups, alkyloxyethyl, alkyloxyethoxyethyl, and alkyloxypolyethoxyethyl having 1 to about 30 carbon atoms in the alkyl group; or when n is zero and z is alkyl, R is <See formula III> in which Y is an alkylene group having 2 to about 20 carbon atoms or an alkylene group interrupted at intervals of 2 or more carbon atoms by oxygen atoms and having 4 to about 40 carbon atoms and one to 19 oxygen atoms. Preferred specific thioesters include ditridecyl thiodipropionate, dimethyl thiodipropionate, and dimethyl dithiodipropionate.
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