Method of preparing diisocyanate composition
US11634383B2 · kind B2 · utility
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6Claims
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Key dates
| Filing date | Dec 4, 2020 |
| Grant date | Apr 25, 2023 |
| Priority date | — |
| Expiry date | Dec 4, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The embodiments provide processes for preparing a diisocyanate composition and an optical lens, which are excellent in yield and quality with mitigated environmental problems by using a solid triphosgene composition instead of phosgene gas in the process of preparing a diisocyanate from a diamine through a hydrochloride thereof and by controlling the content of a decomposition product in a triphosgene composition, the b* value according to CIE color coordinate of the triphosgene composition in an organic solvent, or the content of water in the triphosgene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.