Low-viscosity pressure-adherent silicone elastomer compositions
US4882377A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Sep 21, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J183/04
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A pressure-adherent silicone elastomer composition comprising a homogeneous mixture of a silicone pressure sensitive adhesive composition, a crosslinkable silicone elastomer composition, and, optionally, a viscosity reducing agent. Specifically, the silicone pressure sensitive adhesive composition is a condensation product, having a plasticity of less than 200 mils, of a benzene-soluble resinous copolymer containing silicon-bonded hydroxyl radicals and consisting essentially of triorganosiloxy units of the formula R.sub.3 SiO.sub.1/2 and tetrafunctionalsiloxy units of the formula SiO.sub.4/2 in a ratio of about 0.6 to 0.9 triorganosiloxy units for each tetrafunctionalsiloxy unit present in the copolymer and a polydiorganosiloxane having a viscosity from 100 centipoise to 50,000 centipoise at 25.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.