Polyvinyl alcohol films prepared by coating methods
US7163738B2 · kind B2 · utility
5Cited by
52References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 3, 2002 |
| Grant date | Jan 16, 2007 |
| Priority date | — |
| Expiry date | Aug 6, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31935
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of film fabrication is taught that uses a coating and drying apparatus to fabricate resin films suitable for optical applications. In particular, polyvinyl alcohol films are prepared by simultaneous application of multiple liquid layers to a moving carrier substrate. After solvent removal, the polyvinyl alcohol films are peeled from the sacrificial carrier substrate. Polyvinyl alcohol films prepared by the current invention exhibit good dimensional stability and low birefringence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.