Room temperature curable silicone rubber composition
US4562238A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1984 |
| Grant date | Dec 31, 1985 |
| Priority date | — |
| Expiry date | Jun 18, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/54
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention provides an improvement of a room temperature-curable silicone rubber composition cured by the mechanism of the condensation reaction between terminal silanolic hydroxy groups of a diorganopolysiloxane and an organosilicon compound having at least three alkoxy groups per molecule in the presence of an organotin compound as a catalyst to form crosslinks in respect of the remarkably small permanent compression set as well as excellent heat resistance of the cured rubbery elastomer thereof. Different from conventional compositions of the above mentioned type containing some organotin compound as the curing catalyst, the inventive composition preferably contains very specific organotin compound as the curing catalyst, which is represented by the general formula R.sub.2 R.sup.1 Sn-O-SnR.sup.1 R.sub.2 or R.sub.2 SnR.sub.2.sup.1, in which R is a monovalent hydrocarbon group and R.sup.1 is an acid residue of a monoalkyl ester of a dibasic carboxylic acid such as MeOCOCH.dbd.CHCOO-- and the like, in a limited amount. The composition may further contain an inorganic filler, of which the neutral surface condition is important in order that the composition may have good curabilit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.