Color developer for pressure-sensitive recording papers

Details Color developer for pressure-sensitive recording papers Color developer for pressure-sensitive recording papers

1984-03-19

1985-12-03

Kight, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

568 33, 524171, 428341, 106 21, 346212, B41M 516, B41M 522

Patent

active

045566879

ABSTRACT:
A developer system comprising a zinc chelate of 4,4'-dihydroxydiphenyl sulfone is provided for developing colorless dye precursors used in carbonless copy paper systems. The system preferably includes a styrene-methacrylic acid copolymer and a mineral matrix, especially sodium aluminosilicate, which promotes reactivity of the chelate. The developer system is particularly useful in coating compositions for carbonless second sheets.

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