# US 2025/0084231 A1 · Molded body for housing, resin composition for use in forming same, and masterbatch

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- Number: US 2025/0084231 A1
- Document ID: US20250084231A1
- Status: Published application
- Kind: A1
- Application number: 18/563,917
- Filed: 2022-05-23
- Published: 2025-03-13
- Earliest claimed: 2021-07-01
- Assignees: artience Co., Ltd.; Toyocolor Co., Ltd.
- Applicants: artience Co. Ltd.; Toyocolor Co., Ltd.
- Inventors: Moe SAITO; Yuki MAJIMA; Makoto YANAGISAWA; Keisuke MASUDA
- Web page: https://patentgrep.com/patent/US20250084231A1

## CPC

- C08K 3/041: {Carbon nanotubes}
- C08J 3/22: using masterbatch techniques
- C08J 5/00: Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00)
- C08K 3/04: Carbon
- C08L 101/00: Compositions of unspecified macromolecular compounds
- C08K 2201/003: Additives being defined by their diameter
- C08K 2201/011: Nanostructured additives
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The purpose of the present invention is to provide a molded body that is for use as a housing and transmits electromagnetic waves such as millimeter waves but is still very dark black, a resin composition that is for use in forming the molded body for a housing and has favorable molding fluidity, and a masterbatch. This molded body for a housing is formed from a resin composition that includes a thermoplastic resin (A) and carbon nanotubes (B). The carbon nanotubes (B) have a specific surface oxygen concentration, diffraction peak half width, and Raman spectrum G/D ratio, the molded body includes 0.10-2 parts by mass of the carbon nanotubes (B) per 100 parts by mass of the thermoplastic resin (A), and the surface resistivity of the molded body is at least 1.0×1011 Ω/□.

## Claims

### Claim 1

A molded body for a housing that is formed from a resin composition that includes a thermoplastic resin (A) and carbon nanotubes (B),
wherein the carbon nanotubes (B) satisfy all of the following (1)-(3),
the molded body includes 0.10-2 parts by mass of the carbon nanotubes (B) per 100 parts by mass of the thermoplastic resin (A), and
the surface resistivity of the molded body is at least 1.0×1011 Ω/,
(1) a surface oxygen concentration is 1.0-5.0 mol %,
(2) in powder X-ray diffraction analysis, a diffraction peak half width of a (002) plane is 4.5° or less, and
(3) a ratio (G/D ratio) of a maximum peak intensity G within a range of 1560-1600 cm−1 to a maximum peak intensity D within a range of 1310-1350 cm−1 in a Raman spectrum is less than 0.88.

### Claim 2 (depends on 1)

The molded body for a housing according to claim 1,
wherein the carbon nanotubes (B) have an average diameter of 8-20 nm.

### Claim 3 (depends on 1)

The molded body for a housing according to claim 1,
wherein the thermoplastic resin (A) is one selected from the group consisting of a polyethylene resin, a polypropylene resin, an acrylonitrile-butadiene-styrene copolymer resin, a polycarbonate resin, a polyamide resin and a polybutylene terephthalate resin.

### Claim 4 (depends on 1)

The molded body for a housing according to claim 1,
wherein a thickness is 0.5-5 mm.

### Claim 5 (depends on 1)

The molded body for a housing according to claim 1 that is an in-vehicle article.

### Claim 6 (depends on 1)

A resin composition for use in forming the molded body for a housing according to claim 1.

### Claim 7 (depends on 6)

The resin composition according to claim 6,
wherein the thermoplastic resin (A) includes a thermoplastic resin (A1) and a thermoplastic resin (A2) and
is a melted and kneaded product of a masterbatch that includes the thermoplastic resin (A1) and the carbon nanotubes (B) and the thermoplastic resin (A2).

### Claim 8 (depends on 7)

A masterbatch that is used in the resin composition according to claim 7, comprising:
1-30 parts by mass of the carbon nanotubes (B) per 100 parts by mass of the thermoplastic resin (A1).