Clay-coated record material of improved image durability

Details Clay-coated record material of improved image durability Clay-coated record material of improved image durability

1975-03-06

1976-06-15

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

282 275, 427145, 427146, 427150, 428341, 428454, B41M 500, B41M 512

Patent

active

039638529

ABSTRACT:
Record material useful for carbonless copying systems and the like and adapted to develop distinctive coloration on contact with a preferably colorless dye precursor reactive in an electron donor-acceptor color-producing mechanism, characterized by a thin, uniform surface coating containing smectite clay having its molecular structure chemically modified to impart substantially Newtonian viscosity behavior to aqueous suspensions thereof. On examination by X-ray diffraction, the chemically modified clay preferably exhibits a discernible peak at a characteristic angle of diffraction. Chemical modification is preferably achieved by contacting the clay with the acid, such as sulfuric acid, for a time sufficient to irreversibly alter the clay structure. Such clay coatings can be applied by the usual coating techniques and produce dye images of substantially improved resistance to fading by light and ordinary atmosphere.

REFERENCES:
patent: 3293060 (1966-12-01), Harbort
patent: 3326705 (1967-06-01), Duke
patent: 3330722 (1967-07-01), Amano et al.
patent: 3389009 (1969-06-01), Oda et al.
patent: 3622364 (1971-11-01), Sugahara
Weil-Malherbe et al., "J. Chem. Soc. of London," Dec. 1948, Part II, pp. 2164-2169.

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