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. 16, 2004
Filed:
Jun. 03, 2002
Hiroshi Ohashi, Gunma-ken, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
The invention discloses an efficient and convenient method for the preparation of an aqueous emulsion of an organopolysiloxane having long-chain alkyl groups bonded to the silicon atoms. Instead of dispersing and emulsifying an organopolysiloxane modified in advance with long-chain alkyl groups in an aqueous medium, as is the case in the prior art method, an organohydrogenpolysiloxane having silicon-bonded hydrogen atoms and a long-chain &agr;-olefin compound are co-emulsified in an aqueous medium containing a surface active agent and this aqueous emulsion is heated under agitation with addition of a catalytic platinum compound so as to effect the in situ hydrosilation reaction between the silicon-bonded hydrogen atoms in the organohydrogenpolysiloxane and the ethylenically unsaturated bonds in the &agr;-olefin compound. The aqueous emulsion prepared by the inventive method exhibits excellent stability against long-term storage, dilution with water and mechanical shearing force.