Cross-linking agents for room temperature vulcanizable silicone rubber compositions
US3957704A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1974 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | Dec 19, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process and composition for producing a cross-linking agent component for two-component room temperature vulcanizable silicone rubber compositions comprising the reaction product of 25 to 75 parts of a silicate selected from the class consisting of alkyl silicates of the formula, EQU R.sub.a.sup.2 Si(OR.sup.1).sub.4.sub.-a , and a liquid partial hydrolysis product of the aforementioned alkyl silicates, 10 to 40 parts of a polysiloxane fluid of the formula, EQU R.sub.n.sup.3 SiO.sub.4.sub.-n/2 , where the polysiloxane fluid is chain-stopped with --OH groups and R.sub.3.sup.3 SiO.sub.1/2 units, where the ratio of the R.sub.3.sup.3 SiO.sub.1/2 units to --OH radicals varies from 3:1 to 1:1 and 10 to 40 parts of a metal salt of an acid selected from the class consisting of monocarboxylic acids and dicarboxylic acid and the metal ion is selected from lead to manganese in the electromotive series of metals and is, more preferably, tin, and R.sup.1, R.sup.2 and R.sup.3 are selected from the class consisting of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals and mixtures thereof, a is 0 or 1, and n varies fromm 1.9 to 2.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.