Barrier coatings

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C - Chemistry, Metallurgy

08

G

154/140, 217/20,

C08G 59/50 (2006.01) B32B 27/08 (2006.01) C08G 59/18 (2006.01) C08J 7/04 (2006.01) C09D 163/00 (2006.01)

Patent

CA 1337137

Multilayer packaging materials and multilayer containers including a barrier material having excellent resistance to gas permeability are provided. The multilayer packaging materials and containers include at least one permeable polymeric material and at least one layer of a barrier material which is a reaction product of a polyamine and polyepoxide, the reaction product containing at least seven percent by weight amine nitrogen based on total weight of the polyamine - polyepoxide reaction product. It may be the reaction product of: (i) an ungelled amine-functional polymeric resin, which is a reaction product of a polyamine and a polyfunctional material having at least two functional groups reactive with said polyamine, the ungelled polymeric resin further containing an average of greater than two polyamine moieties per molecule within said resin; and (ii) a polyepoxide, the barrier material characterized as containing at least about seven percent by weight amine nitrogen and having an oxygen permeability of less than about 3cc-mil/100 in2-day-atmosphere and a carbon dioxide permeability of less than about 15 cc-mil/100 in2-day-atomosphere at 23°C and zero percent relative humidity. The barrier material can be formed from coating compositions including as co-curable resinous materials, e.g., a polyepoxide and an ungelled amine-functional polymeric resin formed from a polyepoxide and a polyamine having up to about twoprimary amino nitrogen groups per molecule, the polyamine and polyepoxide present in a reaction mixture at a molar ratio of from about 1.4:1 to about 0.83:1.

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