Color-developer for pressure-sensitive recording sheets
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsMakoto Asano, Saburo Kawashima, 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 acidic conditions with formaldehyde or a substance capable of generating formaldehyde.
Claims14
A color developer for pressure-sensitive recording sheets, said color-developer comprising a co-condensate obtained by co-condensing a reaction intermediate of at least one p-substituted phenol with at least one higher functional phenol selected from the group consisting of 4,4'-isopropylidene-biphenol, 4,4'cyclohexylidene-biphenol and 4,4'-biphenol sulfon under neutral or acidic conditions, and/or a polyvalent metal salt of the said co-condensate, said reaction intermediate being obtained by reacting said p-substituted phenol under acidic conditions with at least an equimolar amount of formaldehyde or a substance capable of generating formaldehyde.
A color developer for pressure-sensitive recording sheets, said color-developer comprising a polyvalent metal salt of co-condensate obtained by co-condensing a reaction intermediate of at least one p-substituted phenol with C.sub.6 H.sub.5 OH under neutral of acidic conditions, said reaction intermediate being obtained by reacting said p-substituted phenol under acidic conditions with at least an equimolar amount of formaldehyde or a substance capable of generating formaldehyde, and then converting the co-condensate into a polyvalent metal salt thereof.
Dependencies are inferred from the claim text.