Recording material containing gamma-alumina

Details Recording material containing gamma-alumina Recording material containing gamma-alumina

1977-01-18

1978-08-22

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

106193J, 106288B, 282 275, 427150, 427151, 427261, 428328, 428329, 428332, 428488, 428914, B32B 516, B41M 516

Patent

active

041090489

ABSTRACT:
A mixture of .gamma.-alumina and its precursors containing 1 to 30% water volatile at 1000.degree. C converts normally colorless dye materials such as crystal violet lactone, malachite green lactone, benzoyl leuco methylene blue and N-phenylleukauramine to the corresponding colored dyes upon contact, and improves the results achieved with recording material consisting essentially of a fibrous web and a pigment composition secured to the fibers of the web if the mixture amounts to at least 10% of the weight of the pigment composition. Particularly strong and stable colors are produced if the fibrous web is coated with a pigment composition prepared from an aqueous dispersion of the mixture and other pigments on which a basic compound is deposited from a water-soluble zinc salt by means of hydroxyl ions.

REFERENCES:
patent: 3223546 (1965-12-01), Hemstock
patent: 3619345 (1971-11-01), Kubo et al.
patent: 4042559 (1977-08-01), Abelson et al.
patent: 4046941 (1977-09-01), Saito et al.

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