Lithium and potassium copolysilicate barrier coatings

Details Lithium and potassium copolysilicate barrier coatings Lithium and potassium copolysilicate barrier coatings

C - Chemistry, Metallurgy

09

D

C09D 1/02 (2006.01) C08J 7/04 (2006.01) C08J 7/06 (2006.01)

Patent

CA 2252878

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 (Li2O)x(K2O)1-x(SiO2)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.

De nouvelles solutions de revêtement d'isolation et un procédé correspondant sont décrits, lesquels permettent de conférer à un substrat polymère enduit des caractéristiques améliorées de perméabilité par rapport à la vapeur, aux gaz et aux parfums. Ce procédé et ces solutions font appel à un copolysilicate de lithium-potassium de formule (Li2O)x(K2O)1-x(SiO2)y. En ce qui concerne le procédé, y est compris entre 1 et 10 si x est inférieur à 1; ou y est supérieur à 4,6 si x vaut 1. En ce qui concerne les nouvelles solutions de revêtement, y est supérieur à 4,6 si x est inférieur à 1; ou x est supérieur à 0,5 si y est compris entre 1 et 10.

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