Patent · US Expired

Mixtures of dye precursors, and pressure-sensitive recording material containing these mixtures

US4717423A · kind A · utility

3Cited by

1References

7Claims

0Family size

Assignee

BASF SE

Inventors

Rainer Dyllick-Brenzinger · Speyer, DE
Udo Mayer · Bischofswerda, DE
Andreas Oberlinner · Ludwigshafen, DE

Key dates

Filing date	Feb 27, 1986
Grant date	Jan 5, 1988
Priority date	—
Expiry date	Feb 27, 2006

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB41M5/1455
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Mixtures of dye precursors which contain (a) the lactone of 2-carboxy-4,4'-bisdimethylaminobenzhydrol (I) and (b) crystal violet lactone and/or one or more fluoran lactones of the formula ##STR1## where R.sup.1 is alkyl, R.sup.2 is alkyl, phenalkyl, unsubstituted or substituted phenyl or cycloalkyl, or ##STR2## is pyrrolidinyl, piperidinyl or morpholinyl, R.sup.3 is H or tert.-butyl, R.sup.4 is H or methyl, R.sup.5 is H, alkyl or phenalkyl and R.sup.6 is H, alkyl, phenalkyl, cycloalkyl or unsubstituted or substituted phenyl, or ##STR3## is pyrrolidinyl, piperidinyl or morpholinyl, possess improved lightfastness in pressure-sensitive recording systems.

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