Record sheets sensitized with reduced charge montmorillonite pig

Details Record sheets sensitized with reduced charge montmorillonite pig Record sheets sensitized with reduced charge montmorillonite pig

1976-01-12

1977-08-09

McCamish, Marion E.

Textiles: manufacturing

427151, 428331, 428914, B41L 120, B32B 516, B41M 312

Patent

active

040406482

ABSTRACT:
A sheet coated with a reduced charge montmorillonite pigment for use in record material, especially pressure-sensitive carbonless copying systems. The pigment is produced by replacing exchangeable cations of a dioctahedral montmorillonite (exemplified by certain bentonite clays) with 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 sheets produce stabilized intense images when printed with a solution of crystal violet lactone (CVL) dye precursor and thus may be used 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: 3330691 (1967-07-01), Adams et al.
patent: 3622364 (1971-11-01), Sugahara et al.
patent: 3674521 (1972-07-01), Noble
patent: 3753761 (1973-08-01), Sugahara et al.
patent: 3928702 (1975-12-01), Matsukawa et al.
patent: 3963852 (1976-06-01), Baxter

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