Composition based on propylene polymers and process for obtaining same
US6642317B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2000 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Nov 15, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2314/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a composition, which includes:(a) from 10 to 55 parts by weight of a propylene polymer (A) which includes up to 2% by weight of ethylene and having a melt flow index MFI(A) of 0.1 to 30 g/10 minutes, measured according to ASTM D 1238 (1986) under a load of 2.16 kg at 230° C.; and(b) from 90 to 45 parts by weight of a polymer (B), which is a statistical copolymer of propylene which includes from 1 to 10% by weight of ethylene and having a melt flow index MFI(B) of 0.1 to 30 g/10 minutes;wherein the ethylene concentration of polymer (B) is greater than that of polymer (A). Another embodiment of the invention provides an article, which includes the above-described composition. Another embodiment of the invention provides a process for preparing the above-described composition, which includes two successive polymerization stages, wherein 10 to 55 parts by weight of polymer (A) and from 90 to 45 parts by weight of polymer (B) are respectively prepared.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.