Polyolefin composite film
US9566770B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 2011 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Nov 5, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The polyolefin composite film is excellent in low-temperature heat sealability, heat-sealing strength and transparency, and at least has surface layer [i]//intermediate layer [iii]//core layer[i], wherein the surface layer[i]includes a propylene resin composition including 0-50 wt % of a specific propyleneα-olefin random copolymer (A) and/or a specific 1-buteneα-olefin copolymer (E), and 50-100 wt % of a propylene polymer (B) having a melting point of 120-170° C. ((A), (E) and (B) in the surface layer totals 100 wt %); the core layer [ii]includes a propylene resin composition including 70-100 wt % of a crystalline polypropylene (C) having a melting point of 150-170° C., and 0-30 wt % of the copolymer (A) ((C) and (A) in the core layer totals 100 wt %); and the intermediate layer[iii]includes a propylene resin composition including 50-95 wt % of the crystalline polypropylene (C) and 50-5 % of the polymer (B), the copolymer (A), andor the copolymer (E) ((C), (B), (A) and (E) in the intermediate layer totals 100 wt %).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.