Pyridine color formers
AssigneeSterling Drug Inc.
InventorsPaul J. Schmidt, William M. Hung
Life of this patent
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Abstract
Novel 4-aryl-or heteroaryl-2,6-bis[(substituted-amino)phenyl]pyridines which are useful as color formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting a 2-, 3- or 4-R.sub.1 R.sub.2 N-acetophenone with an aryl or heteroaryl aldehyde in the present of ammonia or an ammonia-releasing agent.
Claims5
A pressure-sensitive carbonless duplicating system or thermal marking system containing a support sheet coated with a color-forming substance comprising a compound having the formula ##STR10## wherein:
- R.sub.1 and R.sub.2 are the same or different and are selected from the group consisting of lower-alkyl and benzyl, or
- NR.sub.1 R.sub.2 is pyrrolidinyl, piperidinyl, or morpholinyl;
- Z is naphthyl, 9-julolidinyl or a substituent having the formula ##STR11## wherein R.sub.3, R.sub.4, R.sub.7 and R.sub.8 are hydrogen or non-tertiary lower-alkyl;
- R.sub.5 is hydrogen, phenyl or non-tertiary lower-alkyl;
- R.sub.6 is hydrogen, non-tertiary lower-alkyl or non-tertiary lower-alkoxy;
- X is O or S;
- Y.sub.1 and Y.sub.2 are the same or different and are selected from the group consisting of hydrogen, lower-alkyl, lower-alkoxy, halo, nitro, lower-alkoxycarbonyl, phenyl or NR.sub.9 R.sub.10 ;
- R.sub.9 is lower-alkyl or benzyl;
- R.sub.10 is lower-alkyl, benzyl, cyano-lower-alkyl, or
- NR.sub.9 R.sub.10 is pyrrolidinyl, piperidinyl, morpholinyl or isoindolinyl.
A pressure-sensitive carbonless duplicating system or thermal marking system containing a support sheet coated with a color-forming substance comprising a blue or green and a red or orange color former in combination with a compound having the formula ##STR13## wherein:
- R.sub.1 and R.sub.2 are the same or different and are selected from the group consisting of lower-alkyl and benzyl, or
- NR.sub.1 R.sub.2 is pyrrolidinyl, piperidinyl, or morpholinyl;
- Z is naphthyl, 9-julolidinyl or a substituent having the formula ##STR14## wherein R.sub.3, R.sub.4, R.sub.7 and R.sub.8 are hydrogen or non-tertiary lower-alkyl;
- R.sub.5 is hydrogen, phenyl or non-tertiary lower-alkyl;
- R.sub.6 is hydrogen, non-teritary lower-alkyl or non-tertiary lower-alkoxy;
- X is O or S;
- Y.sub.1 and Y.sub.2 are the same or different and are selected from the group consisting of hydrogen, lower-alkyl, lower-alkoxy, halo, nitro, lower-alkoxycarbonyl, phenyl or NR.sub.9 R.sub.10 ;
- R.sub.9 is lower-alkyl or benzyl;
- R.sub.10 is lower-alkyl, benzyl, cyano-lower-alkyl, or
- NR.sub.9 R.sub.10 is pyrrolidinyl, piperidinyl, morpholinyl or isoindolinyl.
Dependencies are inferred from the claim text.