Dye-containing light-polarizing film
US5310509A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1992 |
| Grant date | May 10, 1994 |
| Priority date | — |
| Expiry date | Dec 18, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/3033
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a dye-containing light-polarizing film wherein a disazo dye represented by the formula (I) is used: ##STR1## wherein Me represents a transition metal, being copper, nickel, zinc or iron, R represents a 1-naphthol or 2-naphthol residue which is bonded to azo group at the position adjacent to its hydroxyl group forming a complex bond together with the transition metal and which may have a substituent such as a sulfonic acid, sulfonamide, amino, acylamino or arylamino group or a hydroxyl group not adjacent to the azo group, X and Y represent a hydrogen atom, a C.sub.1 -C.sub.4 alkyl, lower alkoxy, carboxylic acid, sulfonic acid, sulfonamide, sulfonalkylamide, amino, acrylamino or nitro group or a halogen atom, and Z represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl or lower alkoxy group, said formula (I) having from 1 to 3 sulfonic acid groups. Said dye-containing light-polarizing film, as compared with the conventional ones, not only exhibits a high durability, but also has excellent polarization performance enough to be comparable to the light-polarizing films in which iodine is used. Consequently, said dye-containing light-polarizing film is ef…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.