Packaging adhesive mixtures for controlled gas barrier properties

A method of making a laminate comprising a first and a second sheet of polymeric material adhered with an adhesive layer of controlled oxygen transmission rate, the method comprising

• providing a first aqueous latex acrylic-based adhesive component capable of forming a film with a first oxygen transmission rate when applied at a coating weight of 3.5 lbs/3000 ft2, said first latex adhesive component comprising polymer formed from a monomer mixture comprising between about 40 and about 95 wt % vinylidene chloride, between about 5 and about 60 wt % acrylic monomers, and from 0 to about 55 wt % co-polymerizable vinyl monomers, plus sufficient surfactant to maintain an emulsion of said polymer,
• providing a second aqueous latex acrylic-based adhesive component capable of forming a film with a second oxygen transmission rate when applied at a coating weight of 3.5 lbs/3000 ft2, said second latex adhesive component comprising polymer formed from between about 50 and about 100 wt % acrylic monomer, balance co-polymerizable vinyl monomer, plus sufficient surfactant to maintain an emulsion of said polymer,
• said first oxygen transmission rate being at least about 50 cc O2/100 in.2/day lower than said second oxygen transmission rate,
• mixing between about 70 and about 95 wt % of said first component with between about 5 and about 30 wt % of said second component in relative proportions according to the oxygen transmission rate required to form an adhesive composition mixture, and
• adhering said first sheet to said second sheet with said adhesive composition mixture.