Process for producing elastic thermoplastic .alpha.-olefin/cyclic olefin copolymers
US5837787A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1993 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Jan 19, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2314/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Rubbery, amorphous cyclic olefin/.alpha.-olefin copolymers in a molar ratio from 5/95 to 30/70. The copolymers are rubbery and have the general properties of thermoplastic elastomers, e.g. good elastic recovery, toughness, and high elasticity, and have a relatively low glass transition temperature (Tg) to avoid brittleness and hardness under normal use temperature. The copolymers also have a high molecular weight, a narrow molecular weight distribution and a uniform, random comonomer distribution to impart a rubbery loss modulus plateau over the temperature range from Tg to above 100.degree. C., and are optionally lightly crosslinked or plasticized to further extend their useful temperature range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.