Thermoplastic olefin elastomer
US4713419A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1986 |
| Grant date | Dec 15, 1987 |
| Priority date | — |
| Expiry date | Apr 30, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2207/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is provided a thermoplastic olefin elastomer of polyblend composed of 30 to 70 wt % of ethylene-propylene-diene terpolymer (EPDM), 10 to 30 wt % of ethylene-vinyl acetate copolymer (EVA), and 20 to 50 wt % of polypropylene (PP). The EPDM is specified by the Mooney viscosity, propylene content, and third component. The EVA is specified by the VA content and number-average molecular weight. The PP is specified by the number-average molecular weight. This elastomer is suitable for use as a raw material for automotive exterior trim such as side molding, bumper, and mud guard which are produced by injection molding. The elastomer also affords molded items having a good matte-finished appearance. The polyblend obviates the process for partial crosslinking which was necessary for the preparation of conventional elastomer for injection molding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.