Pressure-sensitive record material

Details Pressure-sensitive record material Pressure-sensitive record material

Filed on

1979-06-05

Date issued

1981-06-30

Examiner

Hess, Bruce H. H.

Patent Class

Textiles: manufacturing

Other Related Categories

106 145, 106 21, 252316, 427151, 428307, 428914, B41M 516, B41M 522, C09D 1100

Type

Patent

Status

active

Patent number

042759056

Description

ABSTRACT:
A substantially colorless marking liquid, particularly for use in pressure-sensitive record material, comprising (a) a colorless chromogenic material, (b) a solvent for said chromogenic material and (c) an additive for controlling CB decline. The additive for controlling CB decline, i.e., controlling the capability of the CB sheet to produce an image of satisfactory intensity even after exposure of the CB coating to light, includes certain chromogenic materials such as Pyridyl Blue and phenol derivatives having a free reactive (ortho- or para-) position. The marking liquid helps to prevent CB decline in, for example, carbonless copy paper, a long-standing problem in the art.

REFERENCES:
patent: 3775424 (1973-11-01), Farber
patent: 3853869 (1974-11-01), Farber
patent: 4012554 (1977-03-01), Miller et al.

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