Curable organosiloxane-polyisobutylene mixtures
US5952419A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1998 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Dec 10, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A curable organosiloxane-polyisobutylene composition comprising 20 to 87 weight percent of a polyisobutylene comprising at least 2 alkenyl groups per molecule, 0.4 to 70 weight percent of a polyorganosiloxane comprising at least 2 silicon-bonded alkenyl groups per molecule, 7 to 50 weight percent of a treated reinforcing silica filler, an amount sufficient to cure the composition of an organohydrogensiloxane crosslinker, and a platinum-group metal hydrosilation catalyst in an amount sufficient to effect curing of the composition. Cured elastomers prepared from the compositions can have improved resistance to gas and vapor permeability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.