Polypropylene multi-layer film
US4786562A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1987 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Jul 2, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A polypropylene multi-layer film which comprises a crystalline polypropylene substrate layer having laminated to at least one side thereof a sheet of a resin composition comprising: PA1 (A) 10-90% by weight of a propylene random copolymer satisfying that PA2 (i) the comonomer content is 4-15% by weight, PA2 (ii) the Vicat softening point is 122.degree. C. or less, and PA2 (iii) the cold xylene-soluble portion content is 15% by weight or less, PA1 (B) 10-90% by weight of a copolymer of propylene and an .alpha.-olefin having four or more carbon atoms or a copolymer of propylene, an .alpha.-olefin having four or more carbon atoms and ethylene satisfying that: PA2 (i) the content of the .alpha.-olefin having four or more carbon atoms is 8-35 mole %, PA2 (ii) the ethylene content is 5 mole % or less, PA2 (iii) the cold xylene-soluble portion content is 15-70% by weight, and PA2 (iv) the .DELTA.haze is 5% or less, and PA1 (C) 0-15% by weight of a highly crystalline polypropylene having a melting point of 150.degree. C. or more. This polypropylene multi-layer film has an excellent, low-temperature heat sealing property, a good transparency, a good scratch resistance, and so on.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.