# US 10,767,019 B2 · Resin composition, microporous membrane, separator and secondary battery

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- Number: US 10,767,019 B2
- Document ID: US10767019B2
- Status: Granted
- Kind: B2
- Application number: 15/759,311
- Filed: 2016-09-20
- Published: 2018-06-28
- Granted: 2020-09-08
- Earliest claimed: 2015-09-28
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Shinsuke Miyazawa
- Web page: https://patentgrep.com/patent/US10767019B2

## CPC

- C08J 3/11: from solid polymers
- C08F 4/78: selected from chromium, molybdenum or tungsten
- C08G 61/08: of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring
- C08J 5/18: Manufacture of films or sheets
- C08L 23/10: Homopolymers or copolymers of propene
- C08L 45/00: Compositions of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Compositions of derivatives of such polymers (of cyclic anhydrides or imides C08L35/00; of cyclic esters of polyfunctional acids C08L31/00)
- C08L 101/02: characterised by the presence of specified groups {, e.g. terminal or pendant functional groups}
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M 50/44: Fibrous material
- H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- C08F 8/04: Reduction, e.g. hydrogenation
- C08G 2261/3324: derived from norbornene
- C08G 2261/418: Ring opening metathesis polymerisation [ROMP]
- C08G 2261/724: Hydrogenation
- C08J 2347/00: Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Derivatives of such polymers (C08J2345/00 takes precedence; of conjugated diene rubbers C08J2309/00 - C08J2321/00)
- C08J 2423/06: Polyethene
- C08L 23/06: Polyethylene
- C08L 23/12: Polypropene
- C08L 2201/56: Non-aqueous solutions or dispersions
- C08L 2203/16: used for films
- C08L 2203/20: use in electrical or conductive gadgets
- G01N 25/4866: {by using a differential method}
- G01R 33/46: NMR spectroscopy
- Y02E 60/10: Energy storage using batteries
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The invention is a resin composition containing following polymer (A) and polymer (B), wherein a content of the polymer (A) is 1 to 80 wt % based on the total weight of the polymer (A) and the polymer (B), polymer (A) is a alicyclic structure-containing hydrogenated polymer having a heat distortion temperature of 170° C. or higher, polymer (B) is a polymer incompatible with the polymer (A) and having a heat distortion temperature of lower than 170° C., a microporous film formed by using the resin composition, a separator including the microporous film, and a secondary battery having the separator. One aspect of the invention provides a resin composition suitably used as a raw material for a separator of a secondary battery excellent in safety, a microporous film obtained by forming the resin composition, a separator including the microporous film, and a secondary battery having the separator.

## Claims

### Claim 1

A microporous film formed by using a resin composition, wherein
the resin composition contains a polymer (A) and a polymer (B), wherein a content of the polymer (A) is 1 to 80 wt% based on the total weight of the polymer (A) and the polymer (B);
polymer (A) is an alicyclic structure-containing hydrogenated polymer having a heat distortion temperature of 170° C. or higher and a melting point range from 180° C. to 350° C.;
polymer (B) is a polymer incompatible with the polymer (A) and having a heat distortion temperature of lower than 170° C.;
the microporous film has a sea-island structure constructed by dispersing the polymer (A) in the polymer (B);
an average diameter of island portions in the sea-island structure is from 0.05 to 100 μm; and
an average diameter of micropores in the microporous film is 0.01 to 1 μm.

### Claim 2 (depends on 1)

A separator including the microporous film according to claim 1.

### Claim 3 (depends on 2)

A secondary battery having the separator according to claim 2.

### Claim 4 (depends on 1)

The microporous film of claim 1, wherein
a difference between a surface tension of the polymer (A) for water and a surface tension of the polymer (B) for water is 2 mN/m or more.

### Claim 5 (depends on 1)

The microporous film of claim 1, which is made by a process wherein:
a resin sheet formed of the resin composition contains the polymer (A), the polymer (B), and a pore-forming solvent, the pore-forming solvent used as a forming material, wherein the content of the polymer (A) is 1 to 80 wt% based on the total weight of the polymer (A) and the polymer (B);
the resin sheet is brought into contact with a volatile solvent to extract and remove the pore-forming solvent in the resin composition; and
the volatile solvent is removed from the resin composition by volatilization.

### Claim 6 (depends on 1)

A method for producing the microporous film of claim 1, comprising:
forming a resin sheet of the resin composition containing the polymer (A), the polymer (B), and a pore-forming solvent, the pore-forming solvent used as a forming material, wherein the content of the polymer (A) is 1 to 80 wt% based on the total weight of the polymer (A) and the polymer (B);
bringing the resin sheet into contact with a volatile solvent to extract and remove the pore-forming solvent in the resin composition; and
removing the volatile solvent by volatilization.