Composite polyester films with barrier properties
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United States of America Patent
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Jul 16, 2002
Grant Date -
N/A
app pub date -
Mar 20, 2000
filing date -
Jul 17, 1997
priority date (Note) -
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Abstract
The invention concerns composite polyester films with good barrier properties relative to gases. More precisely, it concerns a biaxially drawn film, based on polyester and having improved barrier properties relative to gases, characterised in that it comprises a base polyester film of 5 to 50 .mu.m, coated on one of its two surfaces with a deposit containing polyvinyl alcohol and a water dispersible copolyester with sulphonyloxy units, said composite film having permeability to oxygen measured at 23.degree. C. under 50% relative humidity, not more than 5 cm.sup.3 /m.sup.2 /24 h. Said composite films have, besides being transparent and having barrier properties, excellent resistance to mechanical stresses, such as in particular crumpling.
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