Scorch-resistant, curable fluorinated elastomer
US4762891A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1987 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Feb 13, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/45
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A scorch-resistant, curable, fluorinated elastomer gum composition is provided. A free-radically curable, fluorinated elastomer gum is compounded with an aliphatically unsaturated, diorganosulfur compound in which at least one of the organo moieties contains a .beta.,.gamma.-aliphatically unsaturated moiety having at least one hydrogen atom bonded to the .alpha. carbon atom of said moiety, said carbon atom being bonded to a sulfur atom of the compound. The diorganosulfur compound reduces the tendency of the compounded fluorinated elastomer gum to scorch, i.e. begin curing prematurely, in the presence of a free-radical curing agent during compounding and shaping of the gum at elevated temperatures below the intended cure temperature. Specific examples of said compounds include 2,5-dihydrothiophene-1,1-dioxide, 2,5-dihydrothiophene-1-oxide, and diallylsulfide. Methods of compounding a fluorinated elastomer gum composition and of shaping and curing such a composition to obtain a fluorinated elastomeric article are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.