# US 12,215,224 B2 · Unsaturated polyester resin composition, molding material, molded article, and battery pack casing for electric vehicle

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- Number: US 12,215,224 B2
- Document ID: US12215224B2
- Status: Granted
- Kind: B2
- Application number: 17/424,917
- Filed: 2020-01-29
- Published: 2022-03-24
- Granted: 2025-02-04
- Earliest claimed: 2019-02-05
- Assignees: Japan Composite Co., Ltd.
- Applicants: Japan Composite Co., Ltd.
- Inventors: Ikuo Akai; Masahiro Hakotani; Takashi Tsukamoto
- Web page: https://patentgrep.com/patent/US12215224B2

## CPC

- C08L 67/06: Unsaturated polyesters
- C08F 283/01: on to unsaturated polyesters {(C08F283/004 takes precedence)}
- C08J 5/04: Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 3/22: of metals
- C08K 7/06: Elements
- C08L 31/04: Homopolymers or copolymers of vinyl acetate
- H01M 50/224: Metals
- H01M 50/227: Organic material
- H01M 50/229: Composite material consisting of a mixture of organic and inorganic materials
- H01M 50/233: characterised by physical properties of casings or racks, e.g. dimensions
- H01M 50/249: specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64)
- H01M 50/276: Inorganic material
- H01M 50/278: Organic material
- H01M 50/28: Composite material consisting of a mixture of organic and inorganic materials
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An unsaturated polyester resin composition includes an unsaturated polyester, a polymerizable monomer, a low shrinkage agent, aluminum hydroxide, and an electrically conductive filler. The unsaturated polyester is a polymerization product of a polybasic acid including a polybasic acid having an ethylenically unsaturated double bond at a predetermined ratio and a polyhydric alcohol. A polyvinyl acetate as the low shrinkage agent is included at a predetermined ratio with respect to the total amount of the unsaturated polyester, the polymerizable monomer, and the low shrinkage agent. The aluminum hydroxide is included at a predetermined ratio with respect to the total amount of the unsaturated polyester, the polymerizable monomer, and the low shrinkage agent.

## Claims

### Claim 1

An unsaturated polyester resin composition comprising:
a resin component including an unsaturated polyester, a polymerizable monomer, and a low shrinkage agent; aluminum hydroxide; and an electrically conductive filler, wherein
the unsaturated polyester is a polymerization product of a polybasic acid and a polyhydric alcohol;
the polybasic acid includes a polybasic acid having an ethylenically unsaturated double bond;
a mixing ratio of the polybasic acid having an ethylenically unsaturated double bond is 80 mol % or more with respect to 100 mol % of the polybasic acid;
the low shrinkage agent includes polyvinyl acetate;
a mixing ratio of the polyvinyl acetate is 3 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the resin component;
a mixing ratio of the aluminum hydroxide is 50 parts by mass or more and 300 parts by mass or less with respect to 100 parts by mass of the resin component;
the electrically conductive filler includes an electrically conductive fiber;
the electrically conductive fiber includes an electrically conductive short fiber having a fiber length of 0.01 mm or more and 0.15 mm or less; and
a mixing ratio of the electrically conductive short fiber is 12% by mass or more and 50% by mass or less with respect to the electrically conductive fiber.

### Claim 2 (depends on 1)

The unsaturated polyester resin composition according to claim 1, wherein
a mixing ratio of the electrically conductive filler is 8 parts by mass or more and 25 parts by mass or less with respect to 100 parts by mass of the resin component.

### Claim 3 (depends on 1)

The unsaturated polyester resin composition according to claim 1, wherein
a mixing ratio of the electrically conductive fiber is 8 parts by mass or more and 21 parts by mass or less with respect to 100 parts by mass of the resin component.

### Claim 4 (depends on 1)

The unsaturated polyester resin composition according to claim 1, wherein
the electrically conductive fiber includes an electrically conductive long fiber having a fiber length of 1.5 mm or more and 5 mm or less, and
a mixing ratio of the electrically conductive long fiber is 10% by mass or more and 30% by mass or less with respect to the electrically conductive fiber.

### Claim 5 (depends on 1)

The unsaturated polyester resin composition according to claim 1, wherein
the electrically conductive filler includes an electrically conductive particle.

### Claim 6 (depends on 5)

The unsaturated polyester resin composition according to claim 5, wherein
a mixing ratio of the electrically conductive particle is 1 part by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the resin component.

### Claim 7 (depends on 1)

The unsaturated polyester resin composition according to claim 1, wherein the electrically conductive filler includes a carbon nanotube.

### Claim 8 (depends on 1)

A molding material comprising:
the unsaturated polyester resin composition according to claim 1 and a reinforcing fiber.

### Claim 9 (depends on 8)

A molded article comprising:
a cured product of the molding material according to claim 8.

### Claim 10 (depends on 9)

The molded article according to claim 9, wherein
a linear expansion coefficient is 17 ppm/° C. or more and 25 ppm/° C. or less.

### Claim 11 (depends on 9)

The molded article according to claim 9 for a battery pack casing for an electric vehicle.

### Claim 12 (depends on 9)

A battery pack casing for an electric vehicle comprising:
an aluminum member and the molded article according to claim 9 used in combination with the aluminum member.