Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified backing or protective layer containing
Patent
1997-02-28
1999-04-20
Huff, Mark F.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified backing or protective layer containing
430532, 430523, 42218605, 422907, 204164, 204165, 427562, G03C 1795, B01J 1908, B05D 314
Patent
active
058957448
ABSTRACT:
Method and apparatus for making thermoplastic web from polyester or polyester blends for subsequent aqueous coating without requirement of an undercoat or primer coat for adhesion of subsequent coatings. Feedstock pellets of polymer, such as polyethylene terephthalate or polyethylene naphthalate, are melted in a screw extruder. Molten polymer is extruded from an extrusion die as a thick, high-viscosity ribbon, which is tempered and stretched in both the machine direction and the transverse direction to form a web of biaxially-oriented polymer of the desired width and thickness. The web is heated to a temperature above T.sub.g to set the biaxial orientation and then is glow discharge treated by passing it through an in-line glow discharge apparatus at atmospheric pressure wherein a stable glow discharge is produced in a gas mixture containing helium between two electrodes connected by an alternating power source operating at a voltage between 0.5 kV and 20 kV at a frequency between 60 Hz and 40 MHz. The web is coated with an aqueous gelatin subbing layer. The coated web then is maintained at elevated temperature. The combination of glow discharge treatment before sub coating and heat treatment after sub coating greatly enhances the adhesion of subsequently-coated aqueous gelatin layers such as photographic emulsions to the web, sufficiently that adhesion-promoting U-coat or primer coat as required in prior base-making methods can be omitted.
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Chen Janglin
Glocker David A.
Perez-Albuerne Evelio A.
Reafler Gerald G.
Romach Mark M.
Eastman Kodak Company
Huff Mark F.
Rosenstein Arthur H.
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