| US 7,517,397 B2 | ||
| Heat sensitive recording material | ||
| Jonathan Campbell, Oldham (United Kingdom); Robert Montgomery O'Neil, Manchester (United Kingdom); Ian Street, Manchester (United Kingdom); William Walker, Manchester (United Kingdom); and John Whitworth, Manchester (United Kingdom) | ||
| Assigned to Ciba Specialty Chemicals Corp., Tarrytown, N.Y. (US) | ||
| Appl. No. 10/553,778 PCT Filed Apr. 26, 2004, PCT No. PCT/EP2004/050607 § 371(c)(1), (2), (4) Date Oct. 20, 2005, PCT Pub. No. WO2004/099116, PCT Pub. Date Nov. 18, 2004. |
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| Claims priority of application No. 0310685.3 (GB), filed on May 09, 2003. | ||
| Prior Publication US 2006/0240981 A1, Oct. 26, 2006 | ||
| Int. Cl. B41M 5/333 (2006.01); C09D 10/00 (2006.01) | ||
| U.S. Cl. 106—31.18 [503/216] | 7 Claims |
| 1. A mixture consisting of
(a) a color developer (1a)
 wherein
A′ stands for a unsubstituted or substituted divalent aromatic radical,
R7 and R8 are independent of each other and stand for —OH, unsubstituted or substituted C1-C8alkyl, unsubstituted or substituted C1-C8alkoxy, unsubstituted or substituted phenyl or naphthyl, —COOR1a, wherein R1a stands for hydrogen, unsubstituted or substituted C1-C8alkyl, benzyl or unsubstituted or substituted phenyl, —C(O)R1a, or —NR1aR1b, wherein R1b, independently from R1a, stands for hydrogen, unsubstituted or substituted C1-C8alkyl, benzyl or unsubstituted or substituted phenyl, s stands for 0, 1, 2, 3, 4 or 5, t stands for 0, 1, 2, 3, 4, or 5, and
(b) a compound of formula (2)
 wherein D stands for
 wherein D′ stands for a unsubstituted or substituted divalent aromatic radical, R13 stands for a substituent as defined for R7, R14 stands for a substituent as defined for R8, x1 stands for 0, 1, 2, 3, 4 or 5, x2 stands for 0, 1, 2, 3, 4, or 5,
and wherein the weight ratio of (1a) to (2) is chosen in the range from 99.9:0.1 to 0.1:99.9.
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