SEALANT FILM FOR BATTERY PACKAGING MATERIAL
It is intended to improve formability of a battery packaging material. A sealant film 20 for a battery packaging material is a multi-layer material composed of a first non-stretched film layer 21 in which one surface thereof serves as a surface of the innermost layer of the battery packaging material 1 , and one or more other non-stretched film layers 22 and 23 laminated on the other surface side of the first non-stretched film layer 21 . The first non-stretched film layer 21 contains a random copolymer containing a monomer other than propylene and propylene as a copolymerization component, a homopolymer of propylene, a lubricant, and a content rate of the homopolymer to a total amount of the random copolymer and the homopolymer is 5 wt % to 30 wt %.
1 . A sealant film for a battery packaging material, comprising:
a multi-layer material composed of a first non-stretched film layer in which one surface thereof serves as a surface of an innermost layer of a battery packaging material, and another non-stretched film layer composed of one or more layers laminated on the other surface of the first non-stretched film layer,
wherein the first non-stretched film layer comprises:
a random copolymer containing a monomer other than propylene and propylene as a copolymerization component;
a homopolymer of propylene; and
a lubricant,
wherein a content rate of the homopolymer to a total amount of the random copolymer and the homopolymer is 5 wt % to 30 wt %.
2 . The sealant film for a battery packaging material, as recited in claim 1 ,
wherein a lubricant concentration in the first non-stretched film layer is 200 ppm to 3,000 ppm.
3 . The sealant film for a battery packaging material, as recited in claim 1 ,
wherein the another non-stretched film layer laminated on the other surface of the first non-stretched film layer is a layer composed of a block copolymer containing a monomer other than propylene and propylene as a copolymerization component.
4 . The sealant film for a battery packaging material, as claimed in claim 3 ,
wherein the another non-stretched film layer comprises a block copolymer containing a monomer other than propylene and propylene as a copolymerization component, and
wherein a lubricant concentration in the another non-stretched film layer is 500 ppm to 5,000 ppm.
5 . The sealant film for a battery packaging material, as recited in claim 1 ,
wherein the non-stretched film layer of the battery packaging material bonded to the metal foil layer is a layer comprising a random copolymer containing a monomer other than propylene and propylene as a copolymerization component.
6 . The sealant film for a battery packaging material, as recited in claim 1 ,
wherein the multi-layer material is a three-layer structure in which a third non-stretched film is laminated on the other surface of the first non-stretched film layer via a second non-stretched film layer as an intermediate layer,
wherein the second non-stretched film layer is a layer comprising a block copolymer containing a monomer other than propylene and propylene as a copolymerization component, and
wherein the third non-stretched film layer is a layer comprising a random copolymer containing a monomer other than propylene and propylene as copolymerization component.
7 . A battery packaging material, comprising:
a heat resistant resin layer;
the sealant film for a battery packaging material as recited in claim 1 ; and
a metal foil layer disposed between the heat resistant resin layer and the sealant film.
8 . The battery packaging material as recited in claim 7 ,
wherein, after aging, an oozed amount of a lubricant present on a surface of the first non-stretched film layer of the sealant film for a battery packaging material is 0.2 μg/cm 2 to 1.0 μg/cm 2 .