The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 30, 1982
Filed:
Jan. 17, 1980
Bernward Deubzer, Burghausen, DE;
Jurgen Burkhardt, Winhoring, DE;
Erich Brunner, Gmunden, AT;
Konrad Sallersbeck, Burghausen, DE;
Wacker-Chemie GmbH, Munich, DE;
Abstract
Hydrophilic, crosslinked organopolysiloxanes are obtained from the polymerization of hydroxyalkylmethacrylate and/or hydroxalkylacrylate in the presence of an organopolysiloxane containing at least 40 mol percent of monoorganosiloxane units. These hydrophilic, crosslinked, modified organopolysiloxanes are prepared by polymerizing hydroxyalkylmethacrylate and/or hydroxyalkylacrylate in the presence of free radical initiators and an organopolysiloxane containing at least 40 mol percent of monoorganosiloxane units which can be crosslinked or has been crosslinked by the condensation reaction in the presence of a condensation catalyst, the amount and type of condensation catalyst and/or catalytic system, including the inhibitor for the polymerization of the hydroxyalkylmethacrylate and/or hydroxyalkylacrylate, is selected so that the crosslinking of the organopolysiloxane which is substantially uniformly distributed in the hydroxyalkylmethacrylate and/or hydroxyalkylacrylate is initiated and preferably completed before the polymerization of the hydroxyalkylmethacrylate and/or hydroxyalkylacrylate is completed.