Photochromic film laminate
US12360401B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2019 |
| Grant date | Jul 15, 2025 |
| Priority date | — |
| Expiry date | Jul 26, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2896
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a photochromic film laminate including (a) a first polymeric film layer having a first surface and an opposing second surface; and (b) an adhesive layer over at least a portion of and in direct contact with the first surface of the first polymeric film layer (a). The adhesive layer is formed from a composition of a thermoplastic polyol having a number average molecular weight greater than or equal to 30,000 g/mol; a poly(anhydride); and a photochromic material. The thermoplastic polyol (i) is present in the composition in an amount greater than or equal to 60 percent by weight based on total combined weight of solids present in the thermoplastic polyol (i) and the poly(anhydride) (ii). Also provided is an optical article prepared with the photochromic film laminate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.