| 摘要 |
A composition comprising a) one or more compounds of formula I <IMAGE> in which R is hydrogen or methyl, R1 is linear or branched C2-8 alkylene n is an integer from 1 to 10 inclusive R2 is a group of formula a) to i> <IMAGE> where R1' is -CH2-CH2-; <IMAGE> where R3 is a linear or branched C1-22 alkyl group, linear or branched C2-22 alkenyl, unsaturated or saturated C5-6 cycloalkyl (e.g. cyclohexyl or cyclopentyl), phenyl, naphthyl, where A is C1-6 alkylene or C2-6 alkenylene; R11 is hydrogen or acetyl; and R15 is C1-6 alkyl; (hereinafter referred to as component a) and b) optionally one or more vinyl compounds that are other than of formula I (hereinafter referred to as component b); and c) 0.1 to 10% (based on the weight of components a) and b) present) of two or more polymerisation catalysts (hereinafter referred to as component c), all percentages being by weight of the composition. Also novel compounds and a process for their preparation are claimed.
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