Crosslinkable organopolysiloxanes and a method for preparing the same

US4571349A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Friedrich Hockemeyer · Burghausen, DE
• Peter John · Burghausen, DE
• Johann Muller · Burghausen, DE
• Gerhard Preiner · Burghausen, DE

Key dates

• Filing date: Dec 28, 1984
• Grant date: Feb 18, 1986
• Expiry date: Dec 28, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D183/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Organopolysiloxanes which are crosslinked by high energy radiation consisting essentially of siloxane units of the formulas: PA0 (a) HR.sup.1 C.dbd.CR.sup.2 COOR.sup.3 SiR.sub.2 O.sub.1/2, PA0 (b) HSR.sup.4 SiRO and PA0 (c) R.sub.2.sup.5 SiO where R is a monovalent hydrocarbon radical or a halogenated monovalent hydrocarbon radical, R.sup.1 is hydrogen or a phenyl radical or a halogenated phenyl radical, R.sup.2 is hydrogen or an alkyl radical having from 1 to 4 carbon atoms per radical and R.sup.3 is a hydrocarbon radical or a halogenated hydrocarbon radical, R.sup.4 is a divalent hydrocarbon radical, R.sup.5 is the same as R or a hydrocarbon radical substituted with the HR.sup.1 C.dbd.CR.sup.2 COO group, where R.sup.1 and R.sup.2 are the same as above, in which two siloxane units of the formula EQU HR.sup.1 C.dbd.CR.sup.2 COOR.sup.3 SiR.sub.2 O.sub.1/2 are present per molecule. These organopolysiloxanes are prepared by equilibrating the corresponding siloxanes in accordance with the conventional methods known in the art. These organopolysiloxanes can be crosslinked by high energy radiation, for example, ultraviolet radiation, to form coatings on paper for releasing tacky substanc…