| 摘要 |
A foamable thermosetting resin system is disclosed comprising: (a) about 50 to about 85 weight percent, based on the weight of the composition, of a trimerisable polyisocyanate; (b) about 5 to about 20 weight percent of a liquid epoxy resin having an epoxy group content in the range from about 3500 to about 7500 mmol/kg; (c) about 5 to about 20 weight percent of a vinyl ester of a saturated aliphatic monocarboxylic acid in which the carboxyl group is attached to a tertiary or quarternary carbon atom; (d) about 1 to about 20 weight percent of a foaming agent, and (e) about 0.005 to about 5 weight percent of an isocyanate trimerization catalyst.
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