Isocyanate composition for optical lenses and process for preparing the same
US10703852B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | May 15, 2018 |
| Grant date | Jul 7, 2020 |
| Priority date | — |
| Expiry date | Jul 27, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/041
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An isocyanate composition is prepared from an amine composition, which comprises (a) 99% to less than 100% by weight of m-xylylenediamine; (b) greater than 0% to 0.5% by weight of p-xylylenediamine; and (c) greater than 0% to 0.5% by weight of at least one selected from the group consisting of benzylamine, 4-methylbenzylamine, and 4-cyanobenzylamine. Therefore, the isocyanate composition used in the preparation of a polythiourethane can be controlled to a specific composition in the synthesis thereof, which makes it possible to conveniently produce an optical lens with a high quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.