Ethylene-propylene-diene rubber, elastomer composition and vulcanized rubber thereof
US5710218A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1995 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Apr 28, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/025
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention provides ethylene-propylene-diene rubbers capable of imparting excellent heat resistance, weather resistance and dynamic fatigue resistance to vulcanized rubbers made therefrom. The ethylene-propylene-diene rubbers have sulfur dispersed therein at a temperature of 90.degree. to 160.degree. C. prior to the addition of vulcanization accelerators or other rubber additives. The ethylene-propylene-diene rubbers contain (A) 90 to 40% by weight of a high-molecular weight ethylene-propylene-diene copolymer rubber having an ethylene content of 60 to 82 mol %, an intrinsic viscosity (.eta.) of 3.0 to 5.0 dl/g as measured at 135.degree. C. in decalin and an iodine value of 8 to 35, (B) 10 to 60% by weight of a low-molecular-weight ethylene-propylene-diene copolymer rubber having an ethylene content of 60 to 82 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 8 to 35, and (C) sulfur in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the rubber dispersed therein at a temperature of 90.degree. to 160.degree. C. prior to the addition of a vulcanization accelerator or other rubber additive.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.