Liquid silicone rubber composition for application to high-voltage electrical insulators and articles
US5994461A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Jun 25, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/70
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A high voltage electrical insulator formed from a curable liquid silicone rubber composition, and subsequently cured, a composition consisting essentially of PA0 (A) 100 weight parts of a fluid mixture of polyorganosiloxane comprising PA1 (a) at least 5 weight percent of a polyorganosiloxane resin comprising repeating units selected from the group consisting of SiO.sub.4/2 and RSiO.sub.3/2, where R is a monovalent hydrocarbon group, and PA1 (b) polydiorganosiloxane having a viscosity in the range from about 100 mPa.multidot.s to 100,000 mPa.multidot.s, that contains at least 2 silicon-bonded alkenyl groups in each molecule, PA0 (B) 1 to 100 weight parts microparticulate silica, PA0 (C) polyorganohydrogensiloxane that contains at least 2 silicon-bonded hydrogen atoms in each molecule, in a quantity that provides a value from 0.5:1 to 20:1 for the ratio of the number of moles of silicon-bonded hydrogen in the instant composition to the number of moles of silicon-bonded alkenyl in component (A), and PA0 (D) a catalytic quantity of a platinum catalyst. The liquid silicone rubber composition, prior to its cure, evidences a desirable fluidity and excellent moldability. Upon its cure the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.