Isocyanate composition with improved stability and reactivity, and optical lens using same
US11673992B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2018 |
| Grant date | Jun 13, 2023 |
| Priority date | — |
| Expiry date | Jan 13, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/041
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An embodiment relates to an isocyanate composition with improved stability and reactivity and a plastic optical lens using the same. The isocyanate composition has improved stability since the content of chlorine in the composition is adjusted to 22-500 ppm, and thus the isocyanate composition can prevent the deterioration in reactivity even in the long-term storage. Therefore, the isocyanate composition according to an example, even when used after long-term storage after preparation, can be prepared, through polymerization with a thiol-based compound, as a polythiourethane-based optical material with excellent physical properties, such as refractive index, Abbe number, transparency, glass transition temperature, and yellowness, and thus the isocyanate composition is useful in fields of glass lenses, a camera lens, and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.