US 5,395,910 A · Liquid-crystalline polyurethanes, compositions of said liquid-crystalline polyurethanes, and a device for optical data storage comprising a liquid-crystalline polyurethane

Abstract

The invention relates to a liquid-crystalline polyurethane having a side chain comprising a mesogenic group, giving a clear polyurethane which does not isomerize under the influence of light. Such liquid-crystalline polyurethanes are highly suited to be used for optical data storage. The invention further relates to infrared-sensitive liquid-crystalline polyurethanes and liquid-crystalline polyurethane compositions, films containing said liquid-crystalline polyurethanes or polyurethane compositions, and a device for optical data storage containing said liquid-crystalline polyurethanes or polyurethane compositions.

Claims14

Dependent claims

A liquid-crystalline side chain polyurethane, wherein the side chain contains a mesogenic group satisfying the general formula:

##STR16## wherein R.sup.1 =-halogen, ##STR17## R.sup.2 =--H or an alkyl group having 1-3 carbon atoms;
R.sup.3 may represent the same groups as R.sup.1, but be selected independently of R.sup.1 ;
Q is the monomer radical attaching the mesogenic group to the main chain of the polyurethane;
n is 0 or 1;
m is 0 or 1;
Y is an integer from 0 through 3;
p is an integer from 2 through 4;
R.sup.4 =an alkyl group having 1-12 carbon atoms;
x is an integer from 0 through 6;
and
Z= ##STR18##

8 more elements

Dependencies are inferred from the claim text.

Liquid-crystalline polyurethanes, compositions of said liquid-crystalline polyurethanes, and a device for optical data storage comprising a liquid-crystalline polyurethane

Life of this patent

Liquid-crystalline polyurethanes, compositions of said liquid-crystalline polyurethanes, and a device for optical data storage comprising a liquid-crystalline polyurethane

Life of this patent

Abstract

Claims14