Polyolefin masterbatch for preparing impact-resistant polyolefin articles
US7288598B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2003 |
| Grant date | Oct 30, 2007 |
| Priority date | — |
| Expiry date | Mar 6, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L23/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A masterbatch composition comprising (1) 10-50 wt % of a crystalline propylene homopolymer and (2) 50-90 wt % of a blend consisting of (a) a copolymer of ethylene and one or more C4-CIO a-olefin(s), containing 10-40 of C4-CIO a-olefin(s), and (b) an amorphous copolymer of propylene and ethylene. Copolymer (b) has an ethylene content from 20-70 wt %, and an intrinsic viscosity value of the xylene-soluble moiety of from 2.2 to 3.5 d/Lg, this value being equal to 0.8 to 1.2 times the intrinsic viscosity value of the xylene-soluble moiety of copolymer (a). The weight ratio of copolymers (a)/(b) is from 3/1 to 1/3. Polyolefin compositions comprising the said masterbatch composition are suitable for the manufacture of automotive parts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.