Patent ID: 6545116
Filing Date: 2003-04-08
Classification: C08L,C09K

Abstract:
A flame retardant for thermoplastic resins comprising crosslinked particles having a toluene-insoluble matter content of at least 50% by weight and an average particle size of 0.01 to 2,000 &mgr;m, wherein said crosslinked particles are prepared by a process comprising the steps of polymerizing a polyorganosiloxane-forming component comprising (a-1) 2 to 70% by weight of at least one member selected from the group consisting of organosiloxanes having an aromatic group and difunctional silane compounds having an aromatic group, (a-2) 29 to 96.5% by weight of at least one member selected from the group consisting of organosiloxanes having no aromatic group and difunctional silane compounds having no aromatic group, (b) 0.5 to 39% by weight of at least one silane compound having a functionality of at least 3 and (c) 0.5 to 30% by weight of at least one polymerizable vinyl group-containing silane compound, the total thereof being 100% by weight, and crosslinking the resulting polyorganosiloxane with a radical polymerization initiator.