Polypropylene composition with broad MWD
US6300420A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1997 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | May 12, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2314/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a copolymer composition prepared from copolymers of propene and .alpha.-olefin having 2 to 12 carbon atoms, having high molecular weight, a broad molecular weight distribution and an improved comonomer distribution. The invention relates also to a process for producing the composition and the use of the composition in pipes, fittings, profiles, films and foams. The composition is a so-called reactor mixture of copolymers of said monomers comprising a first copolymer having a higher molecular weight, an .alpha.-olefin content of 3 to 10 wt. % and a melt flow rate MFR.sub.2 of 0,005 to 0,8, and a second copolymer having a lower molecular weight, thus the final composition has a comonomer content of 2 to 10 wt. %, a melt flow rate MFR.sub.2 of 0,05 to 2,5 wt. %, a melt flow ratio MFR.sub.10 /MFR.sub.2 of 6 to 15, and the split of the copolymers in the composition between the higher molecular weight copolymer and the lower molecular weight copolymer is from 40/60 to 70/30.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.