Packaging adhesive having low oxygen barrier properties

Details Packaging adhesive having low oxygen barrier properties Packaging adhesive having low oxygen barrier properties

C - Chemistry, Metallurgy

09

J

C09J 175/04 (2006.01) B32B 7/12 (2006.01) C08G 18/10 (2006.01) C08G 18/40 (2006.01) C09J 175/08 (2006.01)

Patent

CA 2225029

A two-part, water-free, solvent-free, liquid 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.

On offre un adhésif de complexage liquide à deux parties sans eau et sans solvant qui réunit deux feuilles de matière polymérique, lequel adhésif, sous forme durcie, n'apporte substantiellement pas de contribution aux propriétés d'imperméabilité à l'oxygène du stratifié. La première partie est un mélange d'un polyol A, préférablement un polyéther, et d'un polymère B formé par polymérisation de monomères à double liaison éthylénique en alpha-bêta, le polymère B étant préférablement formé in situ à partir des monomères dissous dans le polyol A. La seconde partie est un isocyanate multifonctionnel, préférablement un uréthane terminé par un isocyanate, formé en faisant réagir un monomère de polyisocyanate avec un polyol.

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