One component polysiloxane RTV compositions hardening with elimination of oximes

US4912153A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Jorg Jeremias · Bensberg, DE
• Hans-Gerd Metzinger · Leverkusen, DE
• Krystyna Preuss · Leverkusen, DE
• Wilhelm Weber · Neustadt, DE

Key dates

• Filing date: Oct 17, 1988
• Grant date: Mar 27, 1990
• Expiry date: Oct 17, 2008

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05K3/285
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyorganosiloxane compositions which can be stored in the absence of moisture and which harden rapidly in the presence of moisture, comprising a mixture of PA0 (1) 100 parts by weight of an .alpha.,.omega.-dihydroxypolydimethylsiloxane having a viscosity of from 0.1 to 1000 Pas, PA0 (2) 0 to 100 parts by weight of an .alpha.,.omega.-bis-(trimethylsiloxy)-polydimethylsiloxane having a viscosity of from 0.04 to 10 Pas as plasticizer, PA0 (3) 1 to 10 parts by weight of an oximinosilane corresponding to the following formula ##STR1## in which R preresents C.sub.1 -C.sub.4 alkyl or alkenyl radicals, PA1 R.sup.1 and R.sup.2 each represent a C.sub.1 -C.sub.4 alkyl radical or hydrogen or R.sup.1 and R.sup.2 together represent a C.sub.4 or C.sub.5 alkylene radical and a may assume the value 0 or 1, PA0 (4) 5 to 250 parts by weight of a reinforcing or non-reinforcing filler of filler mixture, PA0 (5) 0 to 2.5 parts by weight of an aminoalkyl alkoxysilane containing one or more basic nitrogen atoms attached to a silicon through at least 3 C atoms and PA0 (6) 0.01 to 0.5 part by weight tin in the form of a tin catalyst, wherein the tin catalyst is a solution of dialkyltin oxides corresponding…