A copolymer latex of polyvinyl acetate and an alkyl ester of an unsaturated carboxylic acid
Abstract
Abstract AN EMBOSSABLE INDENTIFICATION OR CREDIT CARD HAS BEEN MADE BY LAMINATING THE PHOTOGRAPHIC EMULSION LAYER OF A TRANSPARENT PHOTOGRAPHIC FILM TO A RIGID SUBSTRATE USING AN ASHESIVE BASED ON A LATEX OF POLYVINYL ACEATE COPOLYMERIZED WITH AN ALKYL ESTER OF AN UNSATURATED CARBOXYLIC ACID TO WHICH GELATIN, GELATIN PLASTICIZER AND AN ATTACK SOLVENT FOR THE SUBSTRATE ARE ADDED. THE MIGRATION OF THE PLASTICIZER FROM THE ADHESIVE INTO THE EMULSION DURING AND SUBSEQUENT TO LAMINATION CAUSES AN INCREASED HARDENING AND/OR PLASTICZING OF THE WMULSION AND IMPROVE COHESIVE BONDING WITHIN THE WMULSION, AND CONSEQUENTLY THE OVERALL TOUGHNESS, DURABILITY AND QUALITY OF THE IDENTIFICATION CARD PRODUCED. ALTERNATIVELY, THE GELATIN PLASTICIZER MAY BE WIPED ONTO THE SURFACE OF THE PHOTOGRAPHIC EMULSION LAYER JUST PRIOR TO THE LAMINATION.
Inventors
- 👤 Donald G Wiest
Bibliographic Details
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