Pattern plate of composite structure
AssigneeThe Dow Chemical Company
InventorNorman J. Pozniak
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Abstract
A pattern plate for use in printing has an etched sheet of magnesium laminated to a self-supporting, dimensionally stable, all-plastic base structure of adhesive ethylene/carboxylic acid copolymer layer and poly(ethylene terephthalate) sheet. The magnesium sheet is preferably of minimal thickness corresponding to the maximum depth of etch, e.g. 30 mils, and is bonded to the adhesive ethylene/carboxylic acid copolymer layer, e.g. ethylene/acrylic acid copolymer layer, which is bonded to the poly(ethylene terephthalate) sheet.
Claims1
A composite laminated pattern plate having an etchable sheet of magnesium having unetched thickness of approximately 30 mils bonded to a self-supporting, dimensionally stable, all-plastic base structure composed of an intermediate layer of adhesive copolymer of ethylene and acrylic acid, which intermediate layer has substantially uniform thickness in the approximate range from 0.5 to 2 mils, and a backing sheet of poly(ethylene terephthalate) having substantially uniform thickness in the approximate range from 2 to 5 mils.
Dependencies are inferred from the claim text.