Organopolysiloxane emulsion composition

摘要

An organopolysiloxane emulsion composition produced by the emulsion polymerization of an emulsion that comprises (A) an organopolysiloxane containing a silanol group or an organooxy group, (B) a nonionic surfactant represented by formula (2): R2O(EO)a(PO)bR3 (wherein R2 represents an alkyl group or R4(CO)—; R4 represents an alkyl group; R3 represents an alkyl group or R5(CO)—; R5 represents an alkyl group; EO represents an ethylene oxide group; PO represents an alkylene oxide group; and a and b independently represent 0 to 100, wherein a+b>0 and the sequence of EO and PO may be random or in the form of a block) and (C) a surfactant other than the component (B), and may additionally comprise (D) a polymerization catalyst and (E) water if required. According to the present invention, it becomes possible to produce an extremely stable organopolysiloxane emulsion composition without inhibiting polymerization during the emulsion polymerization of an organopolysiloxane having condensation reactivity. Further, it also becomes possible to reduce the amount of octamethylcyclotetrasiloxane produced during the emulsion polymerization.

主权项

1. An organopolysiloxane emulsion composition obtained from emulsion polymerization of an emulsion comprising
(A) an organopolysiloxane containing a silanol or organoxy group, (B) 1 to 100 parts by weight of a nonionic surfactant having the general formula (2):
R2O(EO)a(PO)bR3  (2)wherein R2 is a straight or branched alkyl group of 1 to 30 carbon atoms or an organic group of R4(CO)—, R4 is a straight or branched alkyl group of 1 to 30 carbon atoms, R3 is a straight or branched alkyl group of 1 to 30 carbon atoms or an organic group of R5(CO)—, R5 is a straight or branched alkyl group of 1 to 30 carbon atoms, EO is an ethylene oxide group, PO is an alkylene oxide group of at least 3 carbon atoms, a and b each are a number of 0 to 100, a+b>0, and the sequence of EO and PO may be random or in blocks,
(C) 1 to 100 parts by weight of a surfactant other than component (B), (D) 0 to 100 parts by weight of a polymerization catalyst, and (E) 1 to 100,000 parts by weight of water; wherein the amounts are based on 100 parts by weight of the component (A).