Mark-forming record materials and process for their use
Abstract
Abstract A NOVEL CHROMOGENIC MATERIAL OF NORMALLY COLORLESS FORM IS DISCLOSED, HAVING A STRUCTURAL FORMULA: 1-(O=),3-R,3-(4-((R-)2-N-)PHENYL),(R1-CH=N-)PHTHALAN WHEREIN R COMPRISES 1,2-DIMETHYLINDOL-3-YL AND P-DIALKYLAMINOPHENYL RADICALS; R1 COMPRISES SUBSTITUTED AND UNSUBSTITUTED AROMATIC AND HETEROCYCLIC-AROMATIC RADICALS; AND R2 COMPRISES HYDROGEN AND ALKYL RADICALS HAVING LESS THAN FIVE CARBON ATOMS-SAID MATERIAL ASSUMING A COLORED FORM UPON REACTIVE CONTACT WITH A LEWIS ACID MOLECULE. EXAMPLES INCLUDE 6-(P-DIMETHYLAMINOBENZYLIDENE)AMINO-3-(P-DIMETHYLAMINOPHENYL)-3-(1,2 - DIMETHYLINDOL-3-YL)PHTHALIDE; 5 - (P-DEMETHYLAMINOBENZYLIDENE) AMINO-3-(P-DIMETHYLAMINOPHENYL)-3-(1,2 - DIMETHYLINDOL3-YL)PHTHALIDE; 6-(BENZYLIDENE)AMINO-3,3-BIS(P-DIMETHYLAMINOPHENYL)PHTHALIDE; 5-(P-DIMETHYLAMINOBENZYLIDENE) AMINO-3,3-BIS(P-DIMETHYLAMINOPHENYL)PHTHALIDE; 6-(CINNAMYLIDENE)AMINO-3-(P-DIMETHYLAMINOPHENYL - 3 - (1,2DIMETHYLINDOL-3-YL)PHTHALIDE.
Inventors
- 👤 Chao-Han Lin
- 👤 Arthur J Wright
Bibliographic Details
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