Diisocyanate composition, preparation method thereof and optical material using same
US12049437B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 4, 2020 |
| Grant date | Jul 30, 2024 |
| Priority date | — |
| Expiry date | Apr 25, 2042 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The diisocyanate composition according to an embodiment of the present invention comprises, in the composition, a benzyl isocyanate having a methyl group in an amount of 5 ppm to 200 ppm, an aromatic compound having a halogen group in an amount of 5 ppm to 1,000 ppm, a benzyl isocyanate having an ethyl group in an amount of 1 ppm to 1,000 ppm, or a combination thereof. It is possible to improve the optical characteristics by preventing the occurrence of yellowing, striae, and cloudiness and to enhance the mechanical properties such as impact resistance at the same time. Thus, it can be advantageously used to prepare an optical material of high quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.