Reversibly thermochromic compositions
AssigneeBASF SE
InventorsWalter Fischer, Abdel-Ilah Basbas, Martin Brunner, Rolf Benz, Manuele Vitali
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Abstract
A reversible thermochromic system comprising a) a compound of the formula (I) or a tautomer thereof (I) wherein R1 is C1-C18alkyl, C2-C18alkenyl, C3-C12cycloalkyl, C3-C12cycloalkyl substituted by 1, 2 or 3 C1-C4alkyl; or C7-C12phenylalkyl; R2 and R3 are hydrogen or R2 and R3 together form a group —CH═CH—CH═CH—; and R4 is hydrogen, —NO2, —SO2—R1 or (4-nitrophenyl)azo; and b) a compound containing a group of the formula (II).
Claims15
A reversible thermochromic system comprising
- a) a compound of formula (I) or a tautomer thereof
- wherein
- R1 is C1-C18alkyl, C2-C18alkenyl, C3-C12cycloalkyl, C3-C12cycloalkyl substituted by 1, 2 or 3 C1-C4alkyl;
- or C7-C12-phenylalkyl;
- R2 and R3 are hydrogen or R2 and R3 together form a group —CH═CH—CH═CH—;
- and
- R4 is hydrogen, —NO2, —SO2—R1 or (4-nitrophenyl)azo;
- and
- b) a compound containing a group of formula
A process for reversibly thermochromically coloring a carrier material which comprises incorporating therein
- a) a compound of formula (I) or a tautomer thereof
- wherein
- R1 is C1-C18alkyl, C2-C18alkenyl, C3-C12cycloalkyl, C3-C12cycloalkyl substituted by 1, 2 or 3 C1-C4alkyl;
- or C7-C12phenylalkyl;
- R2 and R3 are hydrogen or R2 and R3 to ether form a group —CH═CH—CH═CH—;
- and
- R4 is hydrogen, —NO2, —SO2—R1 or (4-nitrophenyl)azo;
- and
- b) a compound containing a group of formula
A compound of formula (I) or a tautomer thereof
- wherein
- R1 is C1-C18alkyl, C2-C18alkenyl, C3-C12cycloalkyl, C3-C12cycloalkyl substituted by 1, 2 or 3 C1-C4alkyl;
- or C7-C12-phenylalkyl;
- R2 and R3 are hydrogen or R2 and R3 together form a group —CH═CH—CH═CH—;
- and
- R4 is hydrogen, —NO2, —SO2—R1 or (4-nitrophenyl)azo.
Dependencies are inferred from the claim text.