Packaging adhesive mixtures for controlled gas barrier properties
AssigneeRohm and Haas Company
InventorsRobert M. Lamber, H. Dale Sherman
Life of this patent
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Abstract
A higher-barrier acrylic/chlorinated vinyl or acrylic/chlorinated vinyl/vinyl latex adhesive component and a lower-barrier acrylic of arcylic/vinyl latex adhesive component are mixed in relative proportions and used to adhere films of low-barrier material, such as films of polyolefins, thereby providing an adhesive layer of controlled gas barrier properties.
Claims11
An aqueous latex adhesive-forming composition comprising a mixture of
- A) a first latex adhesive component comprising polymer formed from a monomer mixture comprising between about 40 and about 95 wt % vinylidene chloride, vinyl chloride or mixtures thereof, 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 latex adhesive component comprising polymer formed from between about 50 wt % and 100% acrylic monomer, balance co-polymerizable vinyl monomer, plus sufficient surfactant to maintain an emulsion of said polymer
- said first latex adhesive component A) having an oxygen transmission rate at least about 50 cc O2/100 in.2/day lower than that of said second latex adhesive component B),
- said first and second latex components being mixed so that the polymer of said first latex adhesive component comprises between about 5 and about 95 wt % of the total polymer of said first and second latex adhesive components and the polymer of said second latex adhesive component comprises between about 95 and about 5 wt % of the total polymer of said first and second latex adhesive components.
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,
- 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 first oxygen transmission rate being at least about 50 cc O2/100 in.2/day lower than said second oxygen transmission rate,
- mixing a portion of said first component with a portion 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.
Dependencies are inferred from the claim text.