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AssigneeShin-Etsu Chemical Co., Ltd.
InventorsToshio Yamazaki, Nobuyuki Suzuki, Shinichi Morioka, Shoji Ichinohe
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Novel organopolysiloxanes having one silanol group within a molecule and the method for manufacturing them at high purity and high yield. The organopolysiloxanes having a silanol group are expressed by the formula (1) below: ##STR1## wherein R.sup.1 is a monovalent hydrocarbon group with 1 to 8 carbon atoms, each of R.sup.2, R.sup.3 and R.sup.4 is a monovalent hydrocarbon group with 1 to 8 carbon atoms or a siloxyl group expressed by --OSiR.sup.5 R.sup.7, wherein R.sup.5, R.sup.6 and R.sup.7 are monovalent hydrocarbon groups with 1 to 8 carbon atoms, Y is either a hydrogen atom, a halogen atom, or a monovalent hydrocarbon group with 1 to 12 carbon atoms, n is an integer of from 0 to 12, and a is either 0 or 1, with the proviso that the grouping Y--(CH.sub.2).sub.n --Si does not includes H--Si, CH.sub.3 --Si or a hydrolyzable silyl group.
An organosiloxane having a silanol group of the formula (1) below, ##STR20## wherein R.sup.1 is an unsubstituted nonovalent hydrocarbon group of 1 to 8 carbon atoms or a monovalent hydrocarbon group of 1 to 8 carbon atoms substituted by halogen or cyano groups, each of R.sup.2, R.sup.3, and R.sup.4 is independently a monovalent hydrocarbon group of 1 to 8 carbon atoms or a siloxyl group expressed by --OSiR.sup.5 R.sup.6 R.sup.7 wherein R.sup.5, R.sup.6, and R.sup.7 are independently substituted or unsubstituted monovalent hydrocarbon groups with 1 to 8 carbon atoms, Y is a (meth)acryloyl group, n is an integer of from 0 to 12, and a is 0 or 1.
An organosiloxane having a silanol group of the formula (1) below, ##STR21## wherein R.sup.1 is an unsubstituted monovalent hydrocarbon group of 1 to 8 carbon atoms or a monovalent hydrocarbon groups of 1 to 8 carbon atoms substituted by halogen or cyano groups, each of R.sup.2, R.sup.3, and R.sup.4 is independently a monovalent hydrocarbon group of 1 to 8 carbon atoms or a siloxyl group expressed by --OSiR.sup.5 R.sup.6 R.sup.7 wherein R.sup.5, R.sup.6, and R.sup.7 are independently substituted or unsubstituted monovalent hydrocarbon groups with 1 to 8 carbon atoms provided that at least one of r.sup.2, R.sup.3 or R.sup.4 is a siloxyl group selected from the group consisting of trimethyl siloxyl, ethyldimethyl siloxyl, 3,3,3,-trifluoropropyl dimethyl siloxyl and cyanoethyldimethyl siloxy, Y is either a hydrogen atom, a halogen atom, or a monovalent organic group of 1 to 12 carbon atoms, n is an integer of from 0 to 12, and a is either 0 or 1, with the proviso that the grouping, Y--(CH.sub.2).sub.n --Si is not H-Si, CH-Si or a hydrolyzable silyl group.
Dependencies are inferred from the claim text.