Method for thermostable and lightfast dichroic light polarizers
US6174394A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1997 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Dec 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133711
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Polarizing coatings are formed from dyestuffs which provide a stable liquid crystalline phase in a wide range of concentrations, temperatures and pH-values. Particles formed by aggregates of the liquid crystal molecules are oriented in a predetermined direction to polarize light. The stability of the liquid crystalline state allows orienting the particles by mechanical forces such as a shearing force applied when the liquid crystal (10) is spread on a support surface (20) by a knife-like doctor (90) or a tension deformation force acting on the meniscus of the liquid crystal deposited between two surfaces (20, 30) as the surfaces are peeled off one another. As a result, the polarizing coatings are formed in some embodiments by simple methods. In some embodiments, the polarizing coatings have a high lightfastness, a high thermal stability, and a high dichroic ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.