Method of making a multilayer polymeric film having dead bend characteristics
US4923549A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1989 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Jun 30, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B7/035
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A multilayer polymeric film having dead bend characteristics which are substantially planar isotropic is a laminate of at least two layers of one or more polymeric films, in which: PA0 A. each polymeric film layer is highly oriented in one direction, such that each polymeric film layer has dead bend properties with respect to bending deformations substantially normal to the direction of orientation; and PA0 B. the direction of orientation of each polymeric film layer forms an angle of at least about 30 degrees with the direction of orientation of each adjacent polymeric film layer. A method for making the multilayer polymeric film having dead bend characteristics also is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.