Polaroid Corporation

Other

Nashua Corporation

Roberta R Arbree

James W Foley

Frank A Meneghini

Norman T Veillette

Henry W Goodwin

Frederick G Frangie

David C Degulis

Disclosed is a method and material for producing and developing thermal latent images. Upon imagewise thermal exposure of a heat sensitive recording material, the recording material selectively yields both a latent image and a visually readable image. The latent image may comprise confidential data or text, and may subsequently be rendered visually readable by an authorized recipient.

Thermal latent image material and method of producing and developing the

This invention relates to photographic processes and products for forming an image in dye from a colorless precursor of a preformed image dye which is substituted with a moiety containing a thiazolidinyl group, said thiazolidinyl group (a) being capable of undergoing cleavage imagewise in the presence of an imagewise distribution of silver ion and/or soluble silver complex and (b) possessing a substituent on the carbon atom in the 2-position that undergoes a .beta.-elimination reaction upon said imagewise cleavage, which moiety maintains the precursor in its colorless form at least until said thiazolidinyl group undergoes said cleavage. In a further embodiment, an imagewise distribution of a photographically useful reagent, which reagent may be, for example, a photographically active reagent, is released as a carbamic acid by a .beta.-elimination reaction following the cleavage of a thiazolidinyl group whereby said reagent is provided with a solubilizing group at least during the initial stages of processing.

Photographic products and processes

Disclosed is a heat-sensitive recording material useful, for example, in the manufacture of labels used in connection with the sale of meat, produce, and the like. The material comprises a cellulosic or other suitable substrate, a thermally imprintable color producing layer and a water-insoluble protective layer over the color-producing layer. It may also include a second protective layer and/or a pressure-sensitive adhesive layer on the opposite side of the substrate from the color-producing layer, and a releasable liner covering the adhesive layer. The color-producing layer has a colorless or pale leuco dye, an acidic developer for producing upon imagewise heating of the recording material, a water-soluble, polymeric binder material, and a basic, acid-neutralizing agent for reducing background discoloration. The protective layer comprises a polymeric resin, a covalent cross-linker for the resin, an acidic substance operative as a catalyst which cross-links the resin in situ, and inert filler particles operative as spacer particles. Oxygen-permeable, heat-sensitive recording material labels made in accordance with the invention avoid the reduction of 'meat bloom' when applied to a package containing red meat.

Solvent resistant thermally printable material

Growing community of inventors

Nashua, NH, United States of America

Roberta R Arbree