Process for the production of propylene polymer films and laminates and products thus obtained
US5286552A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1991 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Feb 25, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2323/10
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed are films and laminates which are prepared by known filming or calendering processes using heterophasic propylene polymer compositions comprising: PA1 A) 10-60 parts by weight of homopolymer polypropylene having an isotactic index greater than 90, or crystalline copolymer of propylene with ethylene and/or other alphaolefins containing more than 85% by weight of propylene and having an isotactic index greater than 85; PA1 B) 10-40 parts by weight of a semi-crystalline essentially linear copolymer containing prevailingly ethylene, which is insoluble in xylene at room temperature; PA1 C) 30-60 parts by weight of an amorphous ethylene-propylene copolymer, soluble in xylene at room temperature and containing 40-70% by weight of ethylene; said propylene polymer compositions having a ratio between the intrinsic viscosities, in tetrahydronaphthalene at 135.degree. C., of the portion soluble in xylene and of the portion insoluble in xylene at room temperature of from 0.8 to 1.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.