Photochromic polyurethane laminate
US9981452B2 · kind B2 · utility
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398References
16Claims
0Family size
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Key dates
| Filing date | Sep 2, 2016 |
| Grant date | May 29, 2018 |
| Priority date | — |
| Expiry date | Sep 2, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31551
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A photochromic polyurethane laminate that is constructed to solve certain manufacturing difficulties involved in the production of plastic photochromic lenses is disclosed. The photochromic laminate includes at least two layers of a resinous material and a photochromic polyurethane layer that is interspersed between the two resinous layers and which contains photochromic compounds. The polyurethane layer is formed by curing a mixture of a solid thermoplastic polyurethane, at least one isocyanate prepolymer, at least one photochromic compound, and a stabilizing system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.