Composition of and a method for preparing high-temperature oil-resistant elastomers from hydrogenated butadiene-acrylate copolymers
US4994528A · 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 primaryC08F8/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A random copolymer is formed by emulsion polymerization from two monomeric classes. The first monomeric class is a conjugated diene or substituted conjugated diene containing from four to about eight carbon atoms. The second monomeric class is of the general formula EQU CH.sub.2 .dbd.CHR.sub.1 CX wherein R.sub.1 is hydrogen or an alkyl group containing from 1 to about 4 carbon atoms and X is --OOR.sub.2, --ONR.sub.3 R.sub.4, or --OOR.sub.7 OR.sub.2. R.sub.2 is an alkyl group containing from 1 to about 4 carbon atoms, --CH.sub.2 CF.sub.3 or --CH.sub.2 CF.sub.2 CF.sub.2 H. R.sub.3 and R.sub.4 are alkyl groups independently containing from 1 to about 4 carbon atoms and R.sub.7 is an alkylene group containing from 1 to about 4 carbon atoms. The second monomeric class can be replaced with up to about 20 percent by weight of the general formula ##STR1## wherein R.sub.5 is an alkenyl group containing from about 2 to about 8 carbon atoms and R.sub.6 is hydrogen or an alkyl group containing from 1 to about 8 carbon atoms. The random copolymer thus obtained is hydrogenated in the presence of a transition metal catalyst and a trialkylaluminum and further in the absence of Lewis acids such as …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.