Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1981-12-16
1983-12-20
Lesmes, George F.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
134 26, 134 30, 427299, 427301, 427302, 427316, 427322, 427354, 427359, 427337, 427340, 4274071, 4274123, 427171, 428502, 428505, 428523, B05D 300
Patent
active
044217803
ABSTRACT:
Heat-sealable films are described which are constituted by a polyolefin film, particularly polypropylene, having on one surface thereof a layer of primer, applied in aqueous or aqueous-alcoholic solution, and chosen from: polyethylenimines, products of the condensation of urea or melamine with formaldehyde, particularly the etherified compounds; alkoxyalkyl melamine polyhydroxylates; or mixtures of the said compounds; and, on the other surface thereof, a layer of the said primer or one similar to the first, followed by a layer of vinyl, vinylidene or acrylic polymer or copolymer.
The process for the production of these films includes the surface treatment of the polyolefin film by means of an electric discharge, flame or chemical agents, followed by the application of both surfaces, by means of an aqueous or aqueous-alcoholic solution, of a layer of primer chosen from: polyethylenimines, products of the condensation of urea or melamine with formaldehyde, particularly the etherified compounds; alkoxyalkyl melamine polyhydroxylates; or mixtures of the said compounds; and finally followed by the application, to one of the surfaces thus treated, of a layer of vinyl, vinylidene or acrylic polymer or copolymer. The heat-sealable films thus obtained have improved characteristics, particularly with regard to their printability, dimensional stability and residual solvent content both in the film per se, and when printed, and are particularly suitable for use in flow packing.
REFERENCES:
patent: Re24062 (1955-09-01), Horton
patent: 2949383 (1960-08-01), Blake
patent: 2956902 (1960-10-01), Greif
patent: 3250639 (1966-05-01), Stead
patent: 3317330 (1967-05-01), Livingston et al.
Argela' Gianluigi
Buzio Pierpaolo
Edefonti Lucio
Buffalow E. Rollins
Lesmes George F.
Societa Italiana Resine S.I.R. S.p.A.
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