Photochromic molding compositions and articles produced therefrom
US7993755B2 · kind B2 · utility
1Cited by
1References
41Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2008 |
| Grant date | Aug 9, 2011 |
| Priority date | — |
| Expiry date | Jul 28, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31725
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyamide molding composition is described, comprising at least one transparent polyesteramide in a proportion by weight of from 70 to 99.99% by weight; at least one further polymer in a proportion by weight of from 0 to 30% by weight; at least one photochromic dye in a proportion by weight of from 0.01 to 2% by weight; and also optionally further dyes and/or additives. The invention further encompasses articles manufactured therefrom, e.g. foils, for the coating of photochromic ophthalmic lenses, or the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.