Tinting enhancers for hard coat tinting
US10302821B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2014 |
| Grant date | May 28, 2019 |
| Priority date | — |
| Expiry date | Oct 14, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention pertains to a tintable hard coat composition for forming a film on an optical article, the composition comprising at least one tinting enhancer, and at least two polymerizable monomers, a first monomer being an hydrolysat of an alkoxysilane comprising at least two alkoxy groups and one epoxy group, and a second monomer having at least two functional groups reacting with the first monomer, at least one of the two monomers having three functional groups of the same kind; the tinting enhancer being preferably chosen from the group consisting of 4-(methyl mercapto) phenol, 4,4′ thiodiphenol,4,4′-Sulfonyldiphenol, and 3,3′-(Ethylenedioxy)diphenol or a mix thereof: Formulas (I), (II), (III), (IV).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.