Pressure sensitive recording unit
Abstract
Abstract A NOVEL CHROMOGENIC MATERIAL OF NORMALLY COLORLESS FORM IS DISCLOSED, HAVING A STRUCTURAL FORMULA: 3-(O=),2''-(R1-CH(-R2)-N(-R)-),6''-((R3)2-N-)SPIRO(PHTHALAN- 1,9''-XANTHENE) WHEREIN R, R1 AND R3 REPRESENT HYDROGEN RADICALS AND ALKYL RADICALS,AND R2 REPRESENTS ESTER, ACYL, ALKYLENE AND PHENYL RADICALS; SAID MATERIALS ASSURING A COLORED FORM UPON REACTIVE CONTACT WITH A LEWIS ACID MOLECULE. EXAMPLES INCLUDE 2'' - (CARBO-TERT-BUTOXY)METHYLAMINO)--6''-DIETHYLAMINOFLORAN; 2'' - (N-(CARBETHOXYMETHYL)-N-METHYLAMINO) - 6'' -DIETHYLAMINOFLUORAN; 2'' -ALLYLAMINO-6'' -DIETHYLAMINOFLUORAN; 6''-DIETHYLAMINO-2''-(N-(N'',(''-DIMETHYLCARBAMOYLMETHYL)AMINO)FLUORAN; 6'' - DIETHYLAMINO - 2''-(NPHENACYL)AMINOFLUORAN; 2'' - (CARBOMETHOXY)METHYHLAMINO(- 6 -DIETHYLAMINOFLUORAN AND 2''-(A-CARBETHOXYETHYL) AMINO)-6'' -DIETHYLAMINOFLUORAN.
Inventors
- 👤 T Hoover
- 👤 A Wright
Bibliographic Details
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