Aminoplast resin photochromic coating composition and photochromic articles
US6432544B1 · kind B1 · utility
103Cited by
18References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1999 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Nov 24, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31895
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Described are articles having an aminoplast resin photochromic coating prepared from an aminoplast resin, component(s) having at least two different functional groups and photochromic substances. The coatings exhibit a Fischer microhardness of from 45 to 180 Newtons per mm2 and desirable photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light. Also described are photochromic aminoplast resin articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.