Polypropylene random copolymer and film thereof
US6451936B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polypropylene random copolymer obtained by copolymerizing propylene and an &agr;-olefin or propylene, ethylene, and &agr;-olefin using a Ziegler-Natta catalyst substantially in the absence of solvent, wherein propylene content is from 92.3 to 75.0% by weight, the ethylene content (E) is from 0 to 2.7% by weight, and the &agr;-olefin content is from 5.0 to 25.0% by weight, and wherein the content (C) of 20° C. xylene-soluble components in the random copolymer satisfies following formulae (1) to (3);in the copolymer wherein the ethylene content (E) is less than 1.5% by weight,C≦12.0 (weight %)  (1)in the copolymer wherein the ethylene content (E) is from 1.5% by weight to 1.8% by weight,C≦42.0−20.0×E (weight %)  (2)and in the copolymer wherein the ethylene content (E) is from 1.8% by weight to 2.7% by weight,C≦6.0 (weight %)  (3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.