Photochromic and non-photochromic articles having a protective coating
US5624757A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 1995 |
| Grant date | Apr 29, 1997 |
| Priority date | — |
| Expiry date | May 24, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31667
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Describes a coating composition for the preparation of abrasion resistant coatings consisting essentially of: PA1 (a) 5 to 35 weight percent of a silane monomer mixture of (i) C.sub.1 -C.sub.12 alkyl tri(C.sub.1 -C.sub.6)alkoxysilane and (ii) tetra(C.sub.1 -C.sub.6)alkoxysilane, the weight ratio of (i) to (ii) being from 3:1 to 1:3; PA1 (b) 1 to 9 weight percent of polyvinyl alcohol that is at least 72 percent hydrolyzed; PA1 (c) a solvating amount of lower aliphatic alcohol; PA1 (d) a catalytic amount of water-soluble acid; PA1 (e) a leveling amount of nonionic surfactant; and PA1 (f) water in an amount sufficient to form hydrolysates of the silane monomers and to solubilize the polyvinyl alcohol and acid. Further described are transparent articles and photochromic articles comprising organic polymeric host material, organic photochromic compound(s), and a cured abrasion resistant coating prepared from the coating composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.