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:
Jan. 07, 1992
Filed:
Jan. 10, 1990
Andre R Colas, Glashuetten, DE;
Dow Corning Limited, Barry, GB;
Abstract
This invention discloses MQ silicone resins having tetravalent units of the formula SiO.sub.2 and monovalent units of the formula R.sub.a R'.sub.3-a SiO.sub.1/2 wherein R' denotes a group of the general formula --R'Si(OR.sup.*).sub.3 with R' being an alkylene group and R.sup.* an alkyl group and wherein a has a value of 2 or 3, preferably 2 for up to 30% of all monovalent units. There is also described a method of making these resins and a composition comprising hydroxy end-blocked polydiorganosiloxanes, MQ resins of the invention and a catalyst. This gives elastomer-forming compositions which have low viscosity in the uncured state whilst retaining good physical properties when cured.