Propylene-ethylene random copolymer film
US6057413A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1996 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | Sep 3, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A propylene-ethylene random copolymer prepared by copolymerizing propylene with ethylene in the substantial absence of a liquid medium with a catalyst system comprising: (A) a solid catalyst component containing magnesium, titanium, a halogen and a first electron donor as an essential component, (B) an organoaluminum compound and (C) a second electron donor compound, wherein an ethylene content (E) of the copolymer is from 3.5 to 7.0% by weight, and wherein a content of a xylene-soluble portion at 20.degree. C. (D) of the copolymer satisfies the relationship D.ltoreq.E+2.0 (% by weight). Films of the copolymer have an excellent appearance (little bleed whitening) and an excellent balance between low-temperature heat-sealing property and rigidity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.