Color-developer for pressure-sensitive sheets
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsMakoto Asano, Yoshimitu Tanabe, Hisamichi Murakami
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Abstract
Disclosed is a color-developer for pressure-sensitive recording sheets, comprising a co-condensate of a reaction intermediate of a p-substituted phenol and a trifunctional or higher phenol, or a polyvalent metal salt of said co-condensate, said reaction intermediate being obtained by the reaction of said p-substituted phenol under alkaline conditions with formaldehyde or a substance capable of generating formaldehyde.
Claims14
A color-developer for pressure-sensitive recording sheets, said color-developer comprising a polyvalent metal salt of a co-condensate obtained by co-condensing a reaction intermediate of at least one p-substituted phenol with at least one trifunctional or higher phenol selected from phenol, 4,4'-isopropylidene-bisphenol, 4,4'-cyclohexylidene-biphenol and 4,4'-biphenol-sulfon under neutral or acidic conditions, said reaction intermediate being obtained by reacting said p-substituted phenol under alkaline conditions with formaldehyde or a substance capable of generating formaldehyde.
Dependencies are inferred from the claim text.