Patent ID: 6673865
Filing Date: 2004-01-06
Classification: B32B,C08L,C09J

Abstract:
An aqueous latex adhesive-forming composition comprising a mixture of:A) 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, and B) 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, said first and second latex adhesive components being mixed so that the polymer of said first latex adhesive component comprises between about 70 and about 95 wt % of the total polymer of said first and second adhesive components, and the polymer of said second latex adhesive component comprises between about 30 and about 5 wt % of the total polymer of said first and second latex adhesive components, in relative proportions according to the oxygen transmission rate required to form an adhesive composition.