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:
May. 05, 1992
Filed:
Feb. 22, 1990
Derek W Butler, South Glamorgan, GB;
Dow Corning Limited, Barry, GB;
Abstract
Liquid organosiloxane MTQ resins of the general formula [M.sub.x T.sub.y Q.sub.z ].sub.n wherein M denotes a monofunctional, T a trifunctional and Q a tetrafunctional siloxane unit, n has an average value of from 4 to 14, x+y is not less than z and not more than 2 z and x/y has a value of from 2 to 9 are prepared by a method comprising (I) adding together (A) a silane of the general formula SiZ.sub.4, (B) a silane of the general formula RSiY.sub.3 and (C) a silane of the formula R.sub.3 SiX or (C') a disiloxane of the formula (R.sub.3 Si).sub.2 O in an acidic aqueous medium and (II) allowing Components (A), (B) and (C) or (C') to react together. X denotes a halogen or alkoxy group, Y denotes X or --OSiR'.sub.3, Z denotes an alkoxy group and Component (A) is not added to the aqueous medium prior to Components (B) and (C) or (C').