Asymmetric dichroic dye molecules having poly(arylazo) linking groups, a bis-substituted aryl thiazyl end group, and another end group
First Claim
1. A dichroic dyestuff having the formula
wherein;
is a poly(arylazo) linking group wherein the aryl comprises 6 to 10 carbon atoms and has 4,4'"'"'-azo linkages;
Q is a bis-substituted aryl thiazyl substituent wherein the aryl comprises 6 to 10 carbon atoms;
andZ is selected from the group consisting of naphthalene having an alkyl substituted amino in the 4 position, 2,3-dihydro-2,2'"'"'-substituted-permidine and julolidine groups.
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Accused Products
Abstract
A dichroic dyestuff having the formula
Q--A--Z
wherein:
A is a poly(arylazo) linking group wherein the aryl comprises 6 to 10 carbon atoms and has 4,4'"'"'-azo linkages;
Q is a bis-substituted aryl thiazyl substituent wherein the aryl comprises 6 to 10 carbon atoms;
and
Z is selected from the group consisting of naphthalene having an alkyl substituted amino in the 4 position, 2,3-dihydro-2,2'"'"'-substituted-perimidine and julolidine groups;
forms guest-host combinations with nematic liquid crystals. These dichroic dyes have absorption maxima at wavelengths greater than 600 nanometers and transmit less than 50% of incident light having wavelengths between 600 and 700 nanometers. Thus these dyes, when combined with dichroic dyes which have absorption maxima between 400 and 600 nanometers, and nematic liquid crystals, are useful to provide electro-optical displays which change from clear to a neutral black color or vice versa when an electric field is applied to the electro-optical display.
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Citations
19 Claims
- 1. A dichroic dyestuff having the formula
- space="preserve" listing-type="equation">Q--A--Z
wherein; is a poly(arylazo) linking group wherein the aryl comprises 6 to 10 carbon atoms and has 4,4'"'"'-azo linkages; Q is a bis-substituted aryl thiazyl substituent wherein the aryl comprises 6 to 10 carbon atoms; and Z is selected from the group consisting of naphthalene having an alkyl substituted amino in the 4 position, 2,3-dihydro-2,2'"'"'-substituted-permidine and julolidine groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- 10. A dichroic dyestuff having the formula
- space="preserve" listing-type="equation">Q--A--Z--
wherein A has the formula ##STR71## wherein m is 0, or an integer from 1 to 6, and x is independently 0, 1, 2 or 4 provided that where x is 4, the R groups are independently selected from the group consisting of alkyl or alkoxy groups having from about 1 to 8 carbon atoms; where x is 2, the R groups are independently selected from the group consisting of alkyl or alkoxy groups having from about 1 to 8 carbon atoms, and the two R groups are not substituted on adjacent ring carbon atoms; and when x is 1 in from 0 to m ##STR72## R is the group --C═
CH--C═
CH--, which is substituted on two adjacent ring carbon atoms;Q is selected from the group consisting of ##STR73## wherein B and B'"'"' are independently selected from the group consisting of H, Cn H2n+1, OCn H2n+1, phenyl, phenoxy, trifluoromethylsulfonyl, cyano, and thiocyanato, wherein n is an integer from about 1 to 10; and Z is selected from the group consisting of naphthalene having an alkyl substituted amino in the 4 position, julolidine and 2,3-dihydroperimidine wherein the 2 carbon atom of the perimidine moiety is substituted by groups consisting of alkyls and alkenes having about 1-20 carbon atoms, aryls, and cycloaliphatic and heterocyclic rings, or the 2 carbon atom of the perimidine moiety is substituted with a group which combines with the 2 carbon atom of the perimidine moiety to form a cycloaliphatic or heterocyclic ring said cycloaliphatic or heterocyclic rings having from 4 to 12 carbon atoms and said rings consisting of atoms selected from the group consisting of carbon, hydrogen, nitrogen, oxygen and sulfur.
Specification