Substantially solid reinforcing graft polymers are prepared by polymerizing an ethylenically unsaturated monomer (or mixture of ethylenically unsaturated monomers) with a composition comprising a polyol including a positive amount up to about 1.6 equivalent weight of induced unsaturation per mole of polyol, a free radical initiator and, optionally, an effective amount of a reaction moderator in a perfluorocarbon fluid. The resulting reinforcing graft polymers are particularly useful for polyol dispersions used in the production of polyurethanes having enhanced physical properties such as load bearing or hardness, tensile strength and tear resistance for example.
通过将
乙烯基不饱和单体(或
乙烯基不饱和单体混合物)与一种组合物进行聚合,制备实质上是固体的增强接枝聚合物,该组合物包括多元醇(每摩尔多元醇中诱导不饱和度的正量最高可达约 1.6 等效重量)、自由基
引发剂以及可选的
全氟碳化合物流体中有效量的反应调节剂。由此产生的增强接枝聚合物特别适用于生产具有增强物理性质(例如承重或硬度、拉伸强度和抗撕裂性)的聚
氨酯时使用的多元醇分散体。