Heat-shrinkable polyester films
US6458437B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2001 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Oct 2, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Heat-shrinkable polyester films, each having: a heat shrinkability of 30-60% after treatment in hot water at 70° C. for 5 seconds and of 65% or higher after treatment in hot water at 85° C. for 5 seconds, both in the main shrinkage direction, and of 10% or lower after treatment in hot water at 85° C. for 5 seconds in a direction perpendicular to the main shrinkage direction; a heat shrinkability after storage at 25° C. for one month of 25% or higher after treatment in hot water at 70° C. for 5 seconds in the main shrinkage direction; and a thickness distribution of 6% or lower, exhibit, when used for full labels on bottles, good shrinkage finish involving only rare occurrence of wrinkles, shrinkage spots, strains and shrinkage failure during heat shrinkage, and exhibit a low decrease in low temperature shrinkability after a lapse of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.