Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1997-05-07
1998-06-30
Szekely, Peter A.
Coating processes
With post-treatment of coating or coating material
Heating or drying
427209, 427285, 427379, B05D 302, B05D 128, B05D 500
Patent
active
057730920
ABSTRACT:
Polyester-based, biaxially oriented composite films having good transparency and gas-barrier properties, exhibiting excellent resistance to mechanical shock and being easily recyclable, comprise a polyester base film (for example shaped from polyethylene terephthalate) 5 .mu.m to 50 .mu.m in thickness, coated on at least one of its two face surfaces with a layer of polyvinyl alcohol having a number-average degree of polymerization equal to or greater than 350 and a thickness less than or equal to 0.3 .mu.m, the mean roughness Rz of the base film being less than or equal to 0.30 .mu.m on the at least one face surface of the film onto which a polyvinyl alcohol layer is coated and said at least one coated face surface comprising, on average, not more than 20 peaks of a height equal to or greater than 1 micrometer and not more than 150 peaks of a height ranging from 0.4 to 1 micrometer, per square millimeter, and such composite films exhibiting a permeability to oxygen, measured at 23.degree. C. at 50% relative humidity, less than or equal to 3 cm.sup.3 /m.sup.2 /24 h.
REFERENCES:
patent: 5302417 (1994-04-01), Yamauchi et al.
Database WPI, Week 8712, Derwent Publications Ltd., London, GB; AN 87-082327 & JP-A-62 032 048.
Database WPI, Week 8939, Derwent Publications Ltd., London, GB; AN 89-283002 & JP-A-1,208,132.
Database WPI, Week 8750, Derwent Publications Ltd., London, GB; AN 87-351332 & JP-A-62 253 435.
Prissette Michel
Veyrat Didier
Rhone-Poulenc Films
Szekely Peter A.
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