Heat sensitive record sheet

Abstract

A heat sensitive record sheet which comprises a coated layer comprising 2-anilino-3-methyl-6-dibutylaminofluoran.

We claim: 
     
       1. A heat sensitive record sheet which comprises a substrate having a coated layer comprising 2-anilino-3-methyl-6-dibutylaminofluoran .Iadd.having ν max  at about 450 nm and about 595 nm as measured in 95% acetic acid..Iaddend. 
     
     
       2. The heat sensitive record sheet according to claim 1, wherein the coated layer comprises 1 part by weight of 2-anilino-3-methyl-6-dibutylaminofluoran .Iadd.having ν max  at about 450 nm and about 595 nm as measured in 95% acetic acid,.Iaddend., from 2 to 10 parts by weight of an acidic substance and from 2 to 10 parts by weight of a binder. 
     
     
       3. The heat sensitive record sheet according to claim 2, wherein the binder is selected from the group consisting of polyvinyl alcohol, polyvinyl pyrolidone, hydroxymethyl cellulose and gum arabic. 
     
     
       4. The heat sensitive record sheet according to claim 2, wherein the acidic substance is selected from the group consisting of bisphenol A, stearic acid, benzoic acid, gallic acid and salicylic acid. .Iadd. 
     
     
       5.  A heat sensitive record sheet which comprises a substrate having a coated layer comprising 2-anilino-3-methyl-6-dibutylaminofluoran obtained by reacting 2-(2-hydroxy-4-dibutylaminobenzoyl)benzoic acid with 2-methyl-4-methoxy-diphenylamine..Iaddend. .Iadd.6. The heat sensitive record sheet of claim 5 wherein the coated layer comprises one part by weight of 2-anilino-3-methyl-6-dibutylaminofluoran obtained by reacting 2-(hydroxy-4-dibutylaminobenzoyl)benzoic acid with 2-methyl-4-methoxy-diphenylamine, from 2 to 10 parts by weight of an acidic substance and from 2 to 10 parts by weight of a binder..Iaddend. .Iadd.7. The heat sensitive record sheet which comprises a substrate having a coated layer comprising 2-anilino-3-methyl-6-dibutylaminofluoran characterized by having the property of generating a color density of 1.0 at a temperature of about 115° C..Iaddend.