Multilayer packaging material having aminoepoxy gas barrier coat

Details Multilayer packaging material having aminoepoxy gas barrier coat Multilayer packaging material having aminoepoxy gas barrier coat

1997-11-24

1999-05-11

Sellers, Robert E.

Coating processes

With post-treatment of coating or coating material

Chemical agent applied to treat coating

229 8701, 383113, 383116, 428 3691, 428413, 428414, 428480, 523428, 523440, 523443, 525486, 525523, 525526, 528 99, 528123, 528124, 528366, 528405, 528407, B05D3/10

Patent

active

059026430

ABSTRACT:
Disclosed is a multilayer packaging material which is suitable for use as a container for malt beverages and which is tinted so as to block at least 90% of light with wavelengths of electromagnetic radiation ranging from 300 nm to 500 nm. The tinted multilayer packaging materials of the present invention includes: (a) at least one layer of a carbon dioxide (CO.sub.2)-permeable polymeric packaging material, and (b) at least one layer of a CO.sub.2 -treated gas barrier coating, which has an oxygen permeability constant not more than 0.05 cubic centimeter-mil/100 square inches/atmosphere/day. The CO.sub.2 -permeable packaging material can be any polymeric material through which CO.sub.2 can pass and which can be used as a packaging material for food or beverages. The gas barrier coating has an oxygen permeability constant, before CO.sub.2 treatment, of less than 0.3. This gas barrier coating includes the reaction product of a polyamine (A) and a polyepoxide (B). The polyamine (A) can be an initial polyamine or an ungelled polyamine adduct having active amine hydrogens. Polyepoxide (B) can be a polyepoxide having a plurality of glycidyl groups linked to an aromatic member.

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