Adhesive for laminate of metal foil and resin film, laminated body, battery exterior packaging material, and battery case and manufacturing method therefor
An adhesive for laminating a metal foil to a resin film, the adhesive including: a polyol (A); a multimer of a polyisocyanate (B); and a metal compound (C) being a compound of at least one metal of Groups 7 and 12, wherein the multimer of a polyisocyanate (B) contains a multimer of a saturated aliphatic polyisocyanate and a multimer of a saturated alicyclic polyisocyanate. Also disclosed is a laminate having a metal foil and a resin film laminated through an adhesive layer obtained from the adhesive for laminating of the invention. Yet further disclosed is a packaging material for a battery casing obtained by using the laminate. Yet further disclosed is a battery case obtained by using the packaging material for a battery casing. Also disclosed is a method for producing a battery case which includes deep drawing or bulging the packaging material for a battery casing.
1. An adhesive for laminating a metal foil to a resin film, the adhesive comprising: a carboxyl group-containing polyolefin resin (A); a polyfunctional isocyanate compound (B); and a metal compound (C) being a compound of at least one metal of Groups 7 and 12,
wherein the compound (C) comprises zinc neodecanoate, zinc 2-ethylhexanoate, zinc stearate, zinc acetylacetonate, or manganese 2-ethylhexanoate.
2. The adhesive for laminating a metal foil to a resin film according to claim 1 , wherein the carboxyl group-containing polyolefin resin (A) comprises a modified polyolefin resin comprising, as a monomer unit, propylene or propylene and ethylene and an ethylenically unsaturated carboxylic acid or an anhydride thereof.
3. The adhesive for laminating a metal foil to a resin film according to claim 1 , wherein the carboxyl group-containing polyolefin resin (A) comprises a carboxyl group-containing polyolefin resin having an MFR of 5 g/10 min to 42 g/10 min as measured at 130° C.
4. The adhesive for laminating a metal foil to a resin film according to claim 1 , wherein the polyfunctional isocyanate compound (B) comprises a multimer of a polyisocyanate.
5. The adhesive for laminating a metal foil to a resin film according to claim 1 , wherein the multimer of a polyisocyanate comprises an isocyanurate of a polyisocyanate.
6. The adhesive for laminating a metal foil to a resin film according to claim 1 , wherein the ratio of the number of isocyanato groups contained in the polyfunctional isocyanate compound (B) to the number of carboxyl groups contained in the carboxyl group-containing polyolefin resin (A) is 0.5 to 13.
7. The adhesive for laminating a metal foil to a resin film according to claim 1 , wherein the metal compound (C) comprises at least one or more carboxylate of at least one metal of Groups 7 and 12.
8. The adhesive for laminating a metal foil to a resin film according to claim 1 , wherein the metal compound (C) comprises a carboxylate of zinc or manganese.
9. The adhesive for laminating a metal foil to a resin film according to claim 1 , further comprising a solvent (D).
10. A laminate in which a metal foil and a resin film are laminated through an adhesive layer obtained from the adhesive for laminating a metal foil to a resin film according to claim 1 .
11. The laminate according to claim 10 , wherein the metal foil is aluminum foil, and the resin film comprises a heat-fusible resin film.
12. The laminate according to claim 10 , wherein the thickness of the metal foil is 10 to 100 μm, and the thickness of the resin film is 9 to 100 μm.
13. A packaging material for a battery casing obtained by using the laminate according to claim 10 .
14. A battery case obtained by using the packaging material for a battery casing according to claim 13 .
15. A method for producing a battery case, comprising: deep drawing or bulging the packaging material for a battery casing according to claim 13 .
16. The adhesive for laminating a metal foil to a resin film according to claim 1 , wherein the metal compound (C) is a reaction accelerator which accelerates a reaction of the carboxyl group-containing polyolefin resin (A) and the polyfunctional isocyanate compound (B).