Packaging propylene copolymer film
US4761462A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1985 |
| Grant date | Aug 2, 1988 |
| Priority date | — |
| Expiry date | Dec 30, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/916
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A packaging transparent propylene copolymer film stretched in at least one direction, which consists of a copolymer of propylene and an .alpha.-olefin having 4 or more carbon atoms or a copolymer of propylene, an .alpha.-olefin having 4 or more carbon atoms and ethylene. The copolymer satisfies the following conditions; PA0 (1) the content of the .alpha.-olefin having 4 or more carbon atoms in the copolymer is 8-25 mole %, PA0 (2) the content of ethylene in the copolymer is 5 mole % or less, PA0 (3) the content of a cold xylene-soluble portion in the copolymer is 15-50% by weight, and PA0 (4) the flexural modulus of the copolymer is 2,500-7,000 kg/cm.sup.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.