Method for increasing diene conversion in EPDM type polymerizations
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- EXXON CHEM PAT INC
- Publication Date
- 2001-04-18
- Estimated Expiration
- Not applicable · inactive patent
Abstract
Description
Background of the invention
[0001] The present invention relates to the use in multi-stage reactors selected from ethylene, C 3 -C 8 Monomers of alpha-olefins and non-conjugated dienes Process for preparing polymer compositions such as ethylene propylene terpolymer (EPDM) compositions. In particular, the present invention relates to the use of multi-stage reactors and metallocene catalyst systems to increase the conversion of diene monomers in the preparation of the above polymer compositions.
[0002] EPDM is a terpolymer or a polymer composed of three different types of monomers. The monomers for making EPDM are: 1) ethylene, 2) propylene or some other higher alpha-olefin, and 3) non-conjugated dienes. Ethylene and propylene monomers provide a saturated backbone which is interrupted by the introduction of non-conjugated diene monomers which provide unsaturation in the EPDM chain. The presence of unsaturated groups is necessary for vulcanization or crosslinking of EPDM to...