Ethylenic random copolymer, process for preparing the same, and rubber composition
US6140441A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1998 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Mar 30, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing an ethylene/.alpha.-olefin/norbornene nonconjugated polyene random copolymer, comprising preparing an ethylene random copolymer simultaneously meeting the following requirements (1) to (5): PA1 (1) the molar ratio of ethylene (a) to an .alpha.-olefin (b) having 3 to 20 carbon atoms ranges from 40:60 to 95:5; PA1 (2) a given amount of non conjugated polyene (c) has a norbornene skeleton; PA1 (3) the available network chain density .nu. is not less than 1.5.times.10.sup.20 /cm.sup.3 after press cross-linking of the copolymer using a dicumyl peroxyde; PA1 (4) the ratio of the rate .gamma.1 of shear showing a shearing stress of 0.4.times.10.sup.6 dyn/cm.sup.2 as determined from the melt flow curve at 100.degree. C. and the rate .gamma.2 of shear showing a shearing stress of 2.4.times.10.sup.6 dyn/cm.sup.2, that is .gamma.2/.gamma.1 and the available network chain density .nu. has a relationship represented by the following general formula: 0.04.times.10.sup.-19 .ltoreq.Log(.gamma.2/.gamma.1)/.nu..ltoreq.0.20.times.10.sup.-19 ; and PA1 (5) the intrinsic viscosity [.eta.] ranges from 0.5 to 10 dl/g as measured in decalin at 135.degree. C. The copolymer has excelle…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.