Heat sealable packaging film producing a peelable seal
US4361237A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1981 |
| Grant date | Nov 30, 1982 |
| Priority date | — |
| Expiry date | Jun 17, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1352
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A heat sealable packaging film particularly suitable for producing a peelable seal by heat sealing on polystyrene. For this purpose, the composition of the film comprises: PA0 (a) 50 to 70% by weight of at least one ethylene polymer having a melt index of 0.5 to 7 g/10 min and selected from polyethylene having a density of from 0.910 to 0.925 g/cm.sup.3 and an ethylene-vinyl acetate copolymer containing at most 7% by weight of vinyl acetate. PA0 (b) 20 to 30% by weight of at least one ethylene-vinyl acetate copolymer containing 20 to 30% by weight of vinyl acetate and having a melt index of 0.5 to 7 g/10 min, and PA0 (c) 10 to 20% by weight of a styrene homopolymer having a melt index of 0.5 to 7 g/10 min. Also provided are packages including a container made from polystyrene and a covering film for the said container, which is made from the aforesaid film, laminated or not on other films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.