Process for the production of an organopolysiloxane
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsYoshio Okamura, Nobuyuki Terae, Tetsuo Okamoto, Hiroshi Ohashi, Hiroyasu Hara
Life of this patent
Estimating the term…
Abstract
An organopolysiloxane containing at least one epoxy group is produced by heating a mixture of (a) an epoxy group-containing organosiloxane; (b) an organosiloxane lacking an epoxy group and optionally containing an arkenyl group; (c) an aprotic polar organic solvent; and (d) a basic catalyst, until reaction between (a) and (b) by a disproportionation equilibration reaction occurs.
Claims18
A process for the production of an organopolysiloxane containing at least one epoxy group and a relatively high degree of polymerization with respect to the starting epoxy group containing organopolysiloxane, said process comprises equilibrating a mixture of (a) an epoxy-containing organopolysiloxane having at least one epoxy group in the molecule;
- (b) an amount effective to react with (a) by a disproportionation equilibration reaction of an epoxyless organosiloxane lacking an epoxy group;
- (c) an aprotic polar organic solvent;
- and (d) a basic catalyst.
A process for the production of an organopolysiloxane containing at least one epoxy group and relatively high degree of polymerization with respect to the starting epoxy group containing organopolysiloxane, said process comprises equilibrating a mixture of:
- I (a) an epoxy containing organopolysiloxane having at least one epoxy group in the molecule,
- (b) an amount effective to react with (a) by a disproportion equilibration reaction of an epoxyless organosiloxane lacking an epoxy group,
- (c) an aprotic polar organic solvent containing no S atom, and
- (d) a basic catalyst;
- or
- II (a) an epoxy containing organopolysiloxane having at least one epoxy group in the molecule,
- (b) an amount effective to react with (a) by a disproportion equilibration reaction of an epoxyless organosiloxane lacking an epoxy group and containing an alkenyl group,
- (c) an aprotic polar organic solvent, and
- (d) a basic catalyst.
Dependencies are inferred from the claim text.