Lithium and potassium copolysilicate barrier coatings
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United States of America Patent
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Jun 6, 2000
Issued Date -
N/A
app pub date -
Sep 24, 1998
filing date -
May 22, 1996
priority date (Note) -
Expired
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Abstract
A method and novel barrier coating solutions are provided for imparting improved vapor, gas or aroma permeability characteristics to a coated polymeric substrate. The method and solutions employ a lithium-potassium copolysilicate of the formula (Li.sub.2 O).sub.x (K.sub.2 O).sub.1-x (SiO.sub.2).sub.y. For the method, y is between 1 and 10, if x is less than 1; or y is greater than 4.6, if x is 1. For the novel coating solutions, y is greater than 4.6 if x is less than 1; or x is greater than 0.5 if y is between 1 and 10.
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