Photochromic pigment
US5821287A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1996 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Aug 8, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/357
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is related to the synthesis of a novel photochromic compound. This compound is a reactive photochromic spirooxazine pigment. Its structure is shown as below: ##STR1## wherein R.sub.1 is either a hydrogen atom or an alkyl group containing 1 to 5 carbon atoms. R.sub.2 and R.sub.3 are any of the following group: an alkyl group having 1 to 10 carbon atoms, or an alkyoxy group having 1 to 10 carbon atoms, or halogen atoms, or hydrogen atoms. The range of n is from 1 to 4, which represents the number of repeated units. This synthesized compound possesses a high thermal resistant property up to 241.degree. C., and it may be added into low melting polyethylene terephthalate(PET) resins for direct melt spinning to prepare photochromic fiber. In addition, the reactive double bond of this compound can be copolymerized with other vinyl monomers, to prepare high molecular weight photochromic materials used for photochromic eye glasses and/or photochromic coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.