Transparent thermographic recording films

Details Transparent thermographic recording films Transparent thermographic recording films

B - Operations, Transporting

41

M

B41M 5/32 (2006.01) B41M 5/42 (2006.01) B41M 5/44 (2006.01) B41M 5/40 (2006.01)

Patent

CA 2070617

7731-CAN TRANSPARENT THERMOGRAPHIC RECORDING FILMS Abstract This invention provides transparent thermographic recording films which exhibit good anti-stick properties, are scratch resistant and substantially 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 particle, 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.

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