Heat-sealable composite films
US6495246B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1996 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Oct 7, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31928
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A composite film is provided by providing a poly-propylene or other base resin layer, laminating a first covering layer of a resin composition (1) comprising the following components (A), (B), (C) and (D) to one side of the base resin layer and a second covering layer of a resin composition (2) comprising the components (A) and (D) to the other side of the base resin layer, which composite film is optionally stretched. The resin composition (2) may contain component (C).(A) a heat-sealable olefinic polymer (e.g. a propylene series copolymer such as propylene-ethylene copolymer, propylene-butene-1 copolymer or propylene-ethylene-butene-1 copolymer)(B) a diorganopolysiloxane (e.g. dimetylpolysiloxane)(C) a fine-powdered heat-resistant resin (e.g. microspheres of a thermosetting resin)(D) a higher fatty acid amideThis composite film is excellent in slidability, antistaticity, releasability and clarity and compatible with a high-speed automatic overwrap packaging machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.