Transparent thermographic recording films

Details Transparent thermographic recording films Transparent thermographic recording films

1991-12-16

1993-03-30

Ryan, Patrick J.

Record receiver having plural interactive leaves or a colorless

Having a colorless color-former, developer therefor, or...

Having nonreactant particles of defined size

503200, 503210, 503214, 503217, 503220, 503224, 503226, B41M 532, B41M 530

Patent

active

051984067

ABSTRACT:
This invention provides transparent thermographic recording films which exhibit good anti-stick properties, are scratch resistant and substantailly craze-free. The thermographic recording films comprise a transparent support carrying (a) a dye image-forming system comprising a di- or triarylmethane thiolactone dye precursor, an organic silver salt, a heat-fusible organic acidic material, and polyvinylbutyral as the binder; and, (b) a protective topcoat layer positioned above said dye image-forming system and comprising a water-insoluble polymeric binder, a mixture of at least two colloidal silicas having different average particle diameters in the proportion, by weight, of 1 part of silica having an average diameter of 50 nm or smaller and 0.3 to 1 part of silica particles having an average diameter no more than 40% of the larger sized silica particles, the ratio of total silica to binder being at least 3 parts per weight silica to 1 part per weight binder. One of the colloidal silicas may be a fumed colloidal silica. An organofunctional silane may be added to the protective topcoat layer or coated as a separate layer on top of the protective topcoat layer.

REFERENCES:
patent: 2956958 (1960-10-01), Iler
patent: 4583103 (1986-04-01), Hayashi et al.
patent: 4820682 (1989-04-01), Shimomura et al.
patent: 4904572 (1990-02-01), Dombrowski, Jr. et al.
patent: 4985394 (1991-01-01), Mori et al.
Iler, R. K., The Chemistry of Silica, John Wiley & Sons, NY, 1979, pp. 369-372.

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