Laminating adhesive
A laminating adhesive includes a polyol; an acid-modified polyol obtained by reaction of a hydrophobic polyol containing a hydrocarbon moiety having 12 to 80 carbon atoms in its molecule in an amount of 30 to 95% by weight or a derivative thereof with an aromatic polycarboxylic acid anhydride and having a carboxyl group at a molecular terminal thereof; an organic polyisocyanate compound; and a silane coupling agent. A laminating adhesive film is excellent even after high-temperature sterilization treatment in adhesion performance between a metal foil or a barrier film and a plastic film serving as an inner layer, and also in adhesion performance between a metal foil or a barrier film and a plastic film serving as an outer layer.
1. A laminating adhesive comprising:
a polyol;
an acid-modified polyol obtained by reaction of a hydrophobic polyol containing a hydrocarbon moiety having 12 to 80 carbon atoms in its molecule in an amount of 30 to 95% by weight or a derivative thereof with an aromatic polycarboxylic acid anhydride and having a carboxyl group at a molecular terminal thereof;
an organic polyisocyanate compound; and
a silane coupling agent.
wherein the ratio of the acid-modified polyol relative to 100 parts by weight of the polyol is 1 to 15 parts by weight.
2. The laminating adhesive according to claim 1 , wherein the hydrophobic polyol comprises castor oil and/or dimer acid ester-containing polyester polyol.
3. The laminating adhesive according to claim 1 , wherein the acid-modified polyol is obtained by reaction of an aromatic polycarboxylic acid anhydride with 5% by mol or more of all terminal hydroxyl groups of the hydrophobic polyol or the derivative thereof.
4. The laminating adhesive according to claim 1 , further comprising an oxyacid of phosphorus or a derivative thereof.