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:
Sep. 27, 1988
Filed:
Jun. 15, 1987
Applicant:
Inventor:
Derek W Butler, Barry, GB;
Assignee:
Dow Corning, Ltd., Barry, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ;
U.S. Cl.
CPC ...
528 23 ; 528 12 ; 528 31 ; 528 43 ;
Abstract
A method for making siloxane resins consisting essentially of tetravalent SiO.sub.2 units and monovalent R.sub.3 SiO.sub.0.5 and H.sub.a R.sub.3-a SiO.sub.0.5 units wherein each R denotes an alkyl group or an aryl group having less than 9 carbon atoms and a denotes 1 or 2, comprises reacting in the presence of an acidic catalyst a siloxane resin consisting essentially of R.sub.3 SiO.sub.0.5 units and SiO.sub.2 units with (H.sub.a R.sub.3-a Si).sub.2 O, where R and a are as defined above. Novel resins wherein only 0.1 to 30 percent of the monovalent units have SiH groups are also disclosed.