Patent · US Active

Reversibly thermochromic compositions

US8277695B2 · kind B2 · utility

0Cited by

7References

14Claims

0Family size

Assignee

BASF SE

Inventors

Walter Fischer · Reinach, CH
Abdel-Ilah Basbas · Basel, CH
Martin Brunner · Pforzheim, DE
Rolf Benz · Gachnang, CH

Key dates

Filing date	Jun 20, 2007
Grant date	Oct 2, 2012
Priority date	—
Expiry date	Dec 17, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B1/12
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A reversible thermochromic system comprising a) a compound of the formula (IA) or a tautomer thereof or a compound of the formula (IB) or a tautomer thereof (IA) (IB) wherein R1 is C1-C18alkyl, C2-C18alkenyl, C3-C12cycloalkyl, C3-C12cycloalkyl substituted by 1, 2 or 3 C1-C4alkyl; phenyl, phenyl substituted by 1, 2 or 3 C1-C4alkyl; or C7-C12phenylalkyl; R2 is hydrogen or a group —SO2—R; R3 and R4 independently of one another are hydrogen, C1-C18alkyl, C2-C18alkenyl, C3-C12cycloalkyl, C3-C12cycloalkyl substituted by 1, 2 or 3 C1-C4alkyl; phenyl, phenyl substituted by 1, 2 or 3 C1-C4alkyl; or C7-C12phenylalkyl; and R is C1-C18alkyl, C2-C18alkenyl, C3-C12cycloalkyl, C3-C12cycloalkyl substituted by 1, 2 or 3 C1-C4alkyl; phenyl, phenyl substituted by 1, 2 or 3 C1-C4alkyl; or C7-C12phenylalkyl; and b) a compound containing a group of the formula (III).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.