Liquid crystalline organopolysiloxanes and liquid crystal compositions
US5437817A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 27, 1991 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Nov 27, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/42
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Liquid crystalline organopolysiloxane is provided having the general formula: EQU R.sub.a (A).sub.b (B).sub.c SiO.sub.(4-a-b-c)/2 wherein R is independently selected from the group consisting of a hydrogen atom, hydrocarbon group having i to 4 carbon atoms, and phenyl group, A is a group of the formula: ##STR1## wherein m, n, and x are integers in the range: m.gtoreq.3, n.gtoreq.2, 5.ltoreq.m+nx.ltoreq.15, x=1 or 2, B is an organic chromophore group having an absorption peak in the visible spectrum, a, b, and c are numbers in the range: 1.ltoreq.a<2, 0<b+c.ltoreq.1, 0.45.ltoreq.b(b+c).ltoreq.0.95, and 1<a+b+c.ltoreq.3. This organopolysiloxane as a high molecular weight liquid crystal is combined with a low molecular weight liquid crystal to form a liquid crystal composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.