Reduced charge montmorillonite pigment for sensitizing record ma

Details Reduced charge montmorillonite pigment for sensitizing record ma Reduced charge montmorillonite pigment for sensitizing record ma

1976-01-12

1976-11-23

Garvin, Patrick P.

Compositions: coating or plastic

Materials or ingredients

106 72, 427146, 428331, C09C 128

Patent

active

039935000

ABSTRACT:
A reduced charge montmorillonite pigment useful as a colorformer in record material, especially pressure-sensitive carbonless copying record systems. The pigment is produced by replacing exchangeable cations of a selected dioctahedral montmorillonite crude clay (exemplified by certain bentonite clays) with a predetermined amount of lithium ions, mildly heating the lithium-exchanged montmorillonite to collapse irreversibly the montmorillonite structure, and grinding the heat-treated material to pigment-size particles, the grinding preferably being carried out in a fluid energy mill. When the pigment particles are coated on paper, the coated sheets produce stabilized intense images when printed with a solution of crystal violet lactone (CVL) dye precursor and thus may be used in record material with CVL without employing secondary slow acting dyes such as benzoyl leuco methylene blue. The sheets are also useful with other colorless or substantially colorless dye precursors.

REFERENCES:
patent: 3395029 (1968-07-01), Bizzarri
patent: 3622364 (1971-11-01), Sugahara et al.
patent: 3753761 (1973-08-01), Sugahara et al.
patent: 3915731 (1975-10-01), Sugahara et al.

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