High temperature, oil-resistant elastomers from hydrogenated copolymers of 1,3-dienes containing fluorine
US4994527A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1989 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Dec 14, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F236/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A copolymer is formed by emulsion polymerization and then hydrogenated to obtain a thermooxidatively stable composition. The copolymer is prepared from two monomer classes. The first monomeric class comprises a fluorodiene of the structure ##STR1## wherein substituent a is independently hydrogen or fluorine, R is hydrogen or a fluoro alkyl group containing from 1 to about 4 carbon atoms and containing at least three fluoro atoms, with the proviso that both R's are not hydrogen, R.sub.1 and R.sub.2 are independently fluorine, hydrogen or a fluoro alkyl group containing from 1 to about 4 carbon atoms and containing at least three fluorine atoms. The second monomeric class is (a) a hydrocarbon diene comprising a conjugated diene, a branched conjugated diene or mixtures thereof containing from 4 to about 8 carbon atoms or a mixture of (a) with (b) a monomer of the general formula CH.sub.2 .dbd.CR.sub.3 X wherein R.sub.3 is hydrogen or an alkyl group containing from 1 to 4 carbon atoms, and X is 2-pyridyl, 4-pyridyl, --COOR.sub.4, CONR.sub.5 R.sub.6 or --COOR.sub.7 OR.sub.4 wherein R.sub.4 is an alkyl group containing from 1 to about 4 carbon atoms, --CH.sub.2 CF.sub.3 or --CH.sub.2 CF.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.