Packaging adhesive having low oxygen barrier properties
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United States of America Patent
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Jun 9, 1998
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app pub date -
Dec 18, 1996
filing date -
Dec 18, 1996
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Abstract
A two-part laminating adhesive is provided which joins two sheets of polymeric material, which adhesive, in cured form, provides substantially no contribution to the oxygen barrier properties of the laminate. The first part is a mixture of a polyol A), preferably a polyether, and a polymer B) formed from polymerization of .alpha.,.beta.-ethylenically unsaturated monomers, polymer B) preferably being formed in situ from monomers dissolved in polyol A). The second part is a multi-functional isocyanate, preferably an isocyanate-terminated urethane formed by reacting a poly-isocyanate monomer with a polyol.
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