Resin coated metal laminate, battery package, and battery
The present invention relates to a resin coated metal laminate comprising at least a sealant layer, a barrier layer, and a substrate layer in this order, wherein the barrier layer includes stainless steel having a thickness of 50 μm or less, the substrate layer includes a polyamide as a main component, a thickness of the substrate layer is thinner than a thickness of the barrier layer, and a maximum value of tensile strength in a tensile test of the substrate layer is 25 N/mm or more, as well as a battery package and a battery using the resin coated metal laminate.
1. A resin coated metal laminate comprising at least a sealant layer, an adhesive layer, a corrosion-preventing layer, a barrier layer, a colored layer, a substrate layer, a mat layer, and a surface protective layer in this order, wherein
the barrier layer includes stainless steel having a thickness of 30 μm or less,
the substrate layer includes a polyamide as a main component,
a thickness of the substrate layer is thinner than a thickness of the barrier layer,
a tensile strength in a tensile test of the substrate layer is 25 N/mm or more in at least one of a length direction and a width direction,
a thickness of the surface protective layer is 0.0001 to 0.01 μm,
the corrosion-preventing layer is formed using a corrosion-preventing treating agent which is a mixture of chromium fluoride, phosphoric acid, and polyvinyl alcohol,
the adhesive layer is formed using an adhesive which comprises a maleic anhydride-modified polypropylene and a phenol novolak-type epoxy resin having a bisphenol A structure, and
the surface protective layer consists essentially of a polymer of a long chain alkyl group-containing vinyl monomer, wherein a contact angle of a surface of the surface protective layer to methyl ethyl ketone is 10° to 50°.
2. The resin coated metal laminate according to claim 1 , wherein a result of an Elmendorf tear strength test concerning a laminated test piece obtained by laminating only the substrate layer so that a total thickness becomes equivalent to 100 μm is 20 (g/100 μm equivalent lamination) or more.
3. The resin coated metal laminate according to claim 1 , wherein the thickness of the substrate layer is 15 μm or less.
4. The resin coated metal laminate according to claim 1 , wherein the mat layer contains fine particles.
5. The resin coated metal laminate according to claim 1 , further comprising an adhesive layer on one surface of the colored layer, wherein
the adhesive layer includes adhesive (i), adhesive (ii) or adhesive (iii) below:
the adhesive (i): urethane-based adhesive;
the adhesive (ii): adhesive including a mixture of a polyolefin-based resin as a base resin and isocyanate as a curing agent; and
the adhesive (iii): adhesive including a mixture of a polyolefin-based resin as a base resin and an epoxy-based resin as a curing agent.
6. The resin coated metal laminate according to claim 1 , which is for use in battery packaging.
7. A battery package comprising a resin coated metal laminate as defined in claim 6 , wherein
the battery package has an interior space for accommodating a battery, and
a sealant layer side of the resin coated metal laminate becomes a side of the interior space.
8. A battery comprising a battery package as defined in claim 7 .
9. A resin coated metal laminate comprising at least a sealant layer, an adhesive layer, a corrosion-preventing layer, a barrier layer, a colored layer, a substrate layer, a mat layer, and a surface protective layer in this order, wherein
the barrier layer includes stainless steel having a thickness of 30 μm or less,
a thickness of the surface protective layer is 0.0001 to 0.01 μm,
the corrosion-preventing layer is formed using a corrosion-preventing treating agent which is a mixture of chromium fluoride, phosphoric acid, and polyvinyl alcohol,
the adhesive layer is formed using an adhesive which comprises a maleic anhydride-modified polypropylene and a phenol novolak-type epoxy resin having a bisphenol A structure,
the surface protective layer consists essentially of a polymer of a long chain alkyl group-containing vinyl monomer, wherein a contact angle of a surface of the surface protective layer to methyl ethyl ketone is 10° to 50°, and
exposure of a layer adjacent to the substrate layer associated with destruction of the substrate layer is not seen as a result of a rubbing test below:
the rubbing test: a test piece is prepared by folding the resin coated metal laminate into two so that a surface on a side opposite to a side of the substrate layer on which the sealant layer is provided becomes convex, an outermost surface of a twofold site of the test piece is contacted with a smooth side of a stainless-steel bar having a diameter of 1.5 cm, to arrange the test piece, and the test piece is rubbed by reciprocating the test piece 99 times a distance of one-way 10.0 cm in a longitudinal direction of the stainless-steel bar, while applying a load of 200 g to the test piece.