Composite particles comprising a hydrophobic dye and an amphiphilic block copolymer and use thereof in optical applications
US12116468B2 · kind B2 · utility
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19References
20Claims
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Key dates
| Filing date | May 25, 2020 |
| Grant date | Oct 15, 2024 |
| Priority date | — |
| Expiry date | Jan 13, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y30/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Composite particles comprising a hydrophobic dye and an amphiphilic block copolymer encapsulating the dye are disclosed. The dye exhibits absorbance peaks at one or more points in the ultraviolet, visible, or infrared regions of the electromagnetic spectrum. The particles are thus useful in optical applications, such as the preparation of contact lenses that screen out harmful radiation. In select embodiments, the dye is Zinc (II) 5, 10, 15, 20-(tetraphenyl) porphyrin and the copolymer is an acrylate or PEO copolymer that has been crosslinked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.