Tear resistant multilayer films and articles incorporating such films
US5604019A · kind A · utility
29Cited by
50References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1995 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Apr 20, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31909
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A tear resistant film comprises more than five layers situated one on the other in a parallel array. The layers are individually selected from a stiff polyester or copolyester, a ductile polymeric material, and optionally, an intermediate material. The stiff polyester or copolyester is oriented in at least one direction. Tear resistance may be measured in a Graves area test and reflects the ability of the film to absorb energy. The films of the invention are useful in many articles including security control laminates for glazing members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.