High solids CB printing ink which produces a black image

Details High solids CB printing ink which produces a black image High solids CB printing ink which produces a black image

1990-09-19

1993-07-27

Schofer, Joseph L.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

503207, 264 47, C09D 500

Patent

active

052311171

ABSTRACT:
A high solids content, aqueous, microcapsule-containing printing ink is prepared by forming microcapsules in situ in a printing ink vehicle. The microcapsules are preferably prepared by interfacial polymerization or interfacial crosslinking between a reactant, such as a polyisocyanate dissolved in an oily solution and a coreactant such as a polysalt of casein and diethylene triamine present in an aqueous solution into which the oily solution is dispensed. The aqueous solution contains water and preferrably a non-volatile diluent such as a non-reducing sugar, for example methyl glucoside. The oil-containing microcapsules contain an oil solvent and a mixture of dye precursors which upon reaction with a color developer produces an intense black image. The printing ink preferably has a 60-70% by weight solids content and may be used as a low-coat-weight CB coating for preparing carbonless copy paper.

REFERENCES:
patent: 4171981 (1979-10-01), Austin et al.
patent: 4755501 (1988-07-01), Chang et al.
patent: 4940738 (1990-07-01), Seitz

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