Preparation method of polythiol for optical lenses by using metal sulfide
US10723697B2 · kind B2 · utility
1Cited by
1References
15Claims
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Key dates
| Filing date | Mar 30, 2018 |
| Grant date | Jul 28, 2020 |
| Priority date | — |
| Expiry date | Oct 4, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D11/00442
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Provided is a preparation of a thioether-based polythiol in a high purity using a metal monosulfide for the incorporation of a thioether group, wherein the content of such components as a metal polysulfide present in the metal monosulfide is controlled to a predetermined level or lower. As a result, an optical lens of high quality with a high refractive index can be produced using the polythiol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.