Process for producing photochromic layered product
US8409670B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2003 |
| Grant date | Apr 2, 2013 |
| Priority date | — |
| Expiry date | Feb 18, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24322
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of producing a laminate comprising preparing a substrate having curved surfaces; applying a photopolymerizable and curable composition containing a photochromic compound and a phosphorus-containing photopolymerization initiator onto the curved surfaces of the base member; and curing the photopolymerizable and curable composition by the irradiation with an active energy ray having a relative intensity profile of 0 to 5% of wavelength components of not shorter than 200 nm but shorter than 300 nm, 25 to 75% of wavelength components of not shorter than 300 nm but shorter than 400 nm and 25 to 75% of wavelength components of not shorter than 400 nm but not longer than 500 nm while maintaining the substrate at not higher than 100° C. This method makes it possible to form a homogeneous and thin film containing a photochromic compound at a high concentration and having a uniform thickness on the substrate having a curved surface, such as a spectacle lens that is generally available, and to impart photochromic properties while maintaining excellent mechanical and optical properties of the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.