POLYOLEFINS MODIFIED BY SILICONES

摘要

The invention provides a process for grafting silicone onto a polyolefin comprising reacting the polyolefin with a silicon compound containing an unsaturated group in the presence of means capable of generating free radical sites in the polyolefin, characterized in that the silicon compound is a branched silicone resin containing at least one group of the formula—X—CH═CH—R″(I) or—X—C≡C—R″(II), in which X represents a divalent organic linkage having an electron withdrawing effect with respect to the—CH═CH—or—C≡C-bond and/or containing an aromatic ring or a further olefinic double bond or acetylenic unsaturation, the aromatic ring or the further olefinic double bond or acetylenic unsaturation being conjugated with the olefinic unsaturation of—X—CH═CH—R″or with the acetylenic unsaturation of—X—C≡C—R″, X being bonded to the branched silicone resin by a C—Si bond, and R″represents hydrogen or a group having an electron withdrawing effect or any other activation effect with respect to the—CH═CH—or—C□C-bond. The polyolefin is reinforced by grafting the branched silicone resin onto it.