Easy processing ethylene propylene elastomers
US4722971A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1987 |
| Grant date | Feb 2, 1988 |
| Priority date | — |
| Expiry date | Feb 24, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
By selecting the composition and intermolecular compositional distribution with respect to ethylene and diene content and the molecular weight and molecular weight distribution, ethylene-propylene-diene terpolymers can have both improved processing properties and compound vulcanizate physical properties. The lower molecular weight fractions of 10.sup.4 to about 5.times.10.sup.5 have at least 2 times the diene content of the higher molecular weight fractions and an ethylene content of 30-80 wt. %. The higher molecular weight fractions of 2.times.10.sup.5 to about 10.sup.7 have a higher ethylene content than the lower molecular weight fractions and are less than 90 wt. % ethylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.