Laminar thermal imaging medium comprising an image-forming layer

Details Laminar thermal imaging medium comprising an image-forming layer Laminar thermal imaging medium comprising an image-forming layer

1992-07-31

1994-01-04

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Transfer procedure between image and image layer, image...

Image layer portion transfer and element therefor

430256, 430259, 430270, G03C 300

Patent

active

052759148

ABSTRACT:
A laminar thermal imaging medium is prepared from a first element comprising a first sheet transparent to image-forming radiation and having at least a surface zone or layer of polymeric material heat-activatable upon subjection of the thermal imaging medium to brief and intense radiation, the first element carrying a layer of porous or particulate image-forming substance having cohesivity in excess of its adhesivity for the polymeric heat-activatable layer, and, on the opposed side of the layer of porous or particulate image-forming substance from the surface zone or layer, a first layer of adhesive, and a second element comprising a second sheet carrying a second layer of adhesive. One of the first and second layers of adhesive comprises a polymeric hardenable adhesive comprising a macromolecular organic binder having amino or substituted amino groups, and a photopolymerizable monomer. The first and second elements are laminated together with the first and second layers of adhesive in contact with one another, so forming a unitary laminar medium in which the hardenable adhesive remains in its unhardened condition and serves to reduce the tendency for the unitary laminar medium to delaminate on application of stresses to the medium. Only a short lag time, typically about 30 seconds, is required between lamination and curing of the hardenable adhesive in order to provide a strong bond between the two elements following curing.

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