Packaging materials
US5084360A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1991 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Apr 23, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A heat sealable polymeric film, heat sealing being provided by a blend of (a) from 25 to 75 percent of propylene/ethylene copolymer containing from 2 to 8 percent by weight of units derived from ethylene, (b) from 1 to 60 percent of but-1-ene/ethylene copolymer containing up to 1 percent by weight of units derived from ethylene, and (c) from 1 to 60 percent of but-1-ene/ethylene copolymer containing from 3 to 10 percent by weight of units derived from ethylene, the percentages of the various copolymers being based on the total weight of the blend. Films of the invention have low heat seal threshold temperatures combined with broad ranges of continuous hot tack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.