Ethylene-propylene-diene rubber, elastomer composition and vulcanized rubber thereof
US5242971A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1991 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Jun 4, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides ethylene-propylene-diene rubbers which are excellent in co-vulcanizability with conjugated diene rubbers and can impart excellent weather resistance, ozone resistance and thermal aging resistance without detriment to excellent mechanical characteristics, wear resistance and dynamic fatigue resistance which the conjugated diene rubbers possess. The ethylene-propylene-diene rubbers of the present invention are characterized by having a Mooney viscosity ML.sub.1+4 (100.degree. C.) of 50 to 120 and comprising PA1 (A) 90 to 40% by weight of a high-molecular weight ethylene-propylene-diene copolymer rubber having an ethylene content of 73 to 85 mol %, an intrinsic viscosity [.eta.] of 2.5 to 5.0 dl/g as measured at 135.degree. C. in decalin and an iodine value of 15 to 35, and PA1 (B) 10 to 60% by weight of a low-molecular-weight ethylene-propylene-diene copolymer rubber having an ethylene content of 73 to 85 mol %, an intrinsic viscosity [.eta.] of 0.15 to 0.8 dl/g as measured at 135.degree. C. in decalin and an iodine value of 15 to 35. Further, the present invention provides elastomer compositions comprising the ethylene-propylene-diene rubber as mention…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.