Resin composition for sealant layer of battery packaging material

Patent metadata

Field	Value
Publication number	US-2016197318-A1
Application number	US-201414916076-A
Country	US
Kind code	A1
Filing date	Sep 3, 2014
Priority date	Sep 3, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

A resin composition can impart high insulating properties, sealing properties, and moldability to a battery packaging material. A resin composition minimizes cracks when used in the sealant layer of a battery packaging material and a heat seal section of the material is bent, and can impart high insulating properties. A resin composition for use in the sealant layer of a battery packaging material contains: at least one of a propylene-ethylene random copolymer having a melting point of 156° C. or more and an ethylene content of 5 mass % or less and a propylene-ethylene block copolymer having a melting point of 158° C. or more and an ethylene content of 7 mass % or less; and a polyolefin elastomer having a melting point of 135° C. or more. A resin composition for the sealing layer of a battery packaging material contains a polyolefin resin having an isotactic fraction of 99% or less.

First claim

1 . A resin composition for a sealant layer of a battery packaging material, comprising:
at least one of (A-1) a propylene-ethylene random copolymer having a melting point of 156° C. or higher and an ethylene content of 5% by mass or less and (A-2) a propylene-ethylene block copolymer having a melting point of 158° C. or higher and an ethylene content of 7% by mass or less; and (B) a polyolefin-based elastomer having a melting point of 135° C. or higher.

2 . The resin composition according to claim 1 , wherein a content of the (B) polyolefin-based elastomer having a melting point of 135° C. or higher is 20 to 75% by mass.

3 . The resin composition according to claim 1 , wherein a total content of the (A-1) propylene-ethylene random copolymer having a melting point of 156° C. or higher and an ethylene content of 5% by mass or less and the (A-2) propylene-ethylene block copolymer having a melting point of 158° C. or higher and an ethylene content of 7% by mass or less is 25 to 80% by mass.

4 . The resin composition according to claim 1 , further comprising (C) a low-stereoregular olefin having a weight average molecular weight of 10,000 or more, a mesopentad fraction (mmmm) of 90% or less and a melting point of 70° C. or higher.

5 . The resin composition according to claim 4 , wherein the (C) low-stereoregular olefin includes a 1-butene-based polymer.

6 . The resin composition according to claim 4 , wherein the content of the (B) polyolefin-based elastomer having a melting point of 135° C. or higher is 20 to 65% by mass, and a content of the (C) low-stereoregular olefin having a weight average molecular weight of 10,000 or more, a mesopentad fraction (mmmm) of 90% or less and a melting point of 70° C. or higher is 2 to 30% by mass.

7 . A resin composition for a sealant layer of a battery packaging material, comprising a polyolefin-based resin having an isotactic fraction (mm) of 99% or less.

8 . The resin composition according to claim 7 , wherein the polyolefin-based resin has an ethylene unit content of 0.1 to 10 mol %.

9 . The resin composition according to claim 7 , wherein in the polyolefin-based resin, an amount of components soluble in n-decane at 80° C. is 0.1 to 15% by mass.

10 . The resin composition according to claim 7 , wherein the polyolefin-based resin includes at least propylene as a constituent monomer.

11 . A battery packaging material comprising a laminate in which at least a base material layer, a metal layer and a sealant layer are laminated in this order, wherein
the sealant layer includes a layer formed of the resin composition according to claim 1 .

12 . The battery packaging material according to claim 11 , wherein the layer formed of the resin composition has a thickness of 1 to 20 μm.

13 . The battery packaging material according to claim 11 , wherein the sealant layer has a thickness of 40 μm or less.

14 . A battery, wherein a battery element including a positive electrode, a negative electrode and an electrolyte is sealed in the battery packaging material according to claim 11 .

Assignees

• Dainippon Printing Co Ltd

Inventors

• Yamashita Rikiya
• Douke Hiroki

Classifications

• C09J123/16 Primary

  Elastomeric} ethylene-propylene or ethylene-propylene-diene copolymers {, e.g. EPR and EPDM rubbers · CPC title

• H01M50/126

  comprising three or more layers · CPC title

• H01M50/193

  Organic material · CPC title

• B32B2307/31

  Heat sealable · CPC title

• C09J153/00

  Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers · CPC title