Pleochroic dyes suitable for use in solution with liquid...

Details Pleochroic dyes suitable for use in solution with liquid... Pleochroic dyes suitable for use in solution with liquid...

C - Chemistry, Metallurgy

09

B

31/105, 345/8

C09B 1/32 (2006.01) C09B 1/20 (2006.01) C09B 1/514 (2006.01) C09B 29/00 (2006.01) C09B 29/08 (2006.01) C09B 31/043 (2006.01) C09B 35/35 (2006.01) C09B 56/12 (2006.01) C09K 19/60 (2006.01)

Patent

CA 1140330

ABSTRACT A liquid crystal material includes in solution therewith a pleochroic dye characterised in that the dye is an anthraquinone of general formula: Image (I) where R2 is either hydrogen or a hydroxyl group and where R3 is an anilino or substituted or modified anilino group and where R1 is hydrogen when R2 is a hy- droxyl group and R1 is an anilino or substituted or modified anilino group, preferably the same as R3, when R2 is hydrogen. A large number of alternatives for R3 are disclosed.

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