Thermochromic media

Details Thermochromic media Thermochromic media

1994-08-05

1998-01-06

Kelly, C. H.

Compositions

Liquid crystal compositions

25229963, 25229961, 25229966, 25229967, 428 1, 424 63, C09K 1952, C09K 1930, C09K 1934, A61K 7021

Patent

active

057050937

ABSTRACT:
An improved ink comprising a thermochromic liquid crystalline media comprising at least one optically inactive nematic component and at least one optically active component, the improvement wherein the optically active component comprises at least one menthol derivative of formula I ##STR1## wherein ##STR2## is 1,4-phenylene optionally substituted by up to 4 methyl group and/or halogen atoms, particularly fluorine atoms or is 1,4 cyclohexylene and MG is a mesogenic group, or forms a mesogenic group together with ##STR3##

REFERENCES:
patent: 4062799 (1977-12-01), Matsukawa et al.
patent: 5188815 (1993-02-01), Coates et al.
Chem. Abstract, vol. 100 No. 165517 of JP 58/029876 A2.
Chem. Abstract, vol. 97, No. 172521 of JP 57/040581 A2.
Chem. Abstract, vol. 89, No. 215560.
Translation of JP 61-1015.
Bone et al., "Terpenoid Derivaties having a high ferroelectric . . . ", Mol. Cryst. Liq. Cryst. Letters, vol. 3(6) pp. 189-195.

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