Polyorganosiloxane and process for producing the same

摘要

A polyorganosiloxane comprising a repeating unit represented by formula (I) and an end cap group represented by formula (II): <CHEM> the polyorganosiloxane further comprising an end group represented by formula (III), an end group represented by formula (IV), and a repeating unit represented by formula (V): <CHEM> <CHEM> in such a manner that the average number of the group represented by OR<1> directly bonded to the silicon atom is 0 or more and less than 2 per one molecule of the polyorganosiloxane, the polyorganosiloxane having a number average molecular weight of from 500 to 100,000, wherein from 50 to 99% by mole of R represents a methyl group, from 1 to 40% by mole of R represents a group capable of being copolymerized with a polymerizable monomer or capable of reacting with a polymer, and the balance of R represents an alkyl group having from 2 to 8 carbon atoms or an unsubstituted or substituted phenyl group; R<1> represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, plurality of R<1> may be the same or different; and R<2> represents an alkyl group having from 1 to 8 carbon atoms or an aryl group having from 6 to 8 carbon atoms, plurality of R<2> may be the same or different.