# US 12,180,364 B2 · Aromatic polycarbonate resin composition

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- Number: US 12,180,364 B2
- Document ID: US12180364B2
- Status: Granted
- Kind: B2
- Application number: 17/288,791
- Filed: 2019-11-07
- Published: 2022-01-06
- Granted: 2024-12-31
- Earliest claimed: 2018-11-08
- Assignees: Mitsubishi Chemical Corporation
- Applicants: Mitsubishi Chemical Corporation
- Inventors: Yohei Nishino; Norikazu Konishi; Yuuichi Yayama; Hiroki Shibata; Toshiki Monden
- Web page: https://patentgrep.com/patent/US12180364B2

## CPC

- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08G 64/06: not containing aliphatic unsaturation
- C08G 64/307: {and phenols}
- C08K 5/3447: condensed with carbocyclic rings
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Provided is an aromatic polycarbonate resin composition that exhibits an excellent surface hardness and strength as well as an excellent designability and lightfastness. The aromatic polycarbonate resin composition contains a carbonate structural unit (X) derived from an aromatic dihydroxy compound represented by a prescribed formula (1) and a carbonate structural unit (Y) derived from an aromatic dihydroxy compound represented by a prescribed formula (2) in a proportion of (X)/(Y)=10/90 to 40/60 as a molar ratio, wherein an amount of a cresolic hydroxy group derived from the aromatic dihydroxy compound represented by formula (1) is 60 to 160 ppm.

## Claims

### Claim 1

An aromatic polycarbonate resin composition comprising an aromatic polycarbonate resin (A), the aromatic polycarbonate resin (A) comprising:
a carbonate structural unit (X) derived from an aromatic dihydroxy compound of formula (1),
a carbonate structural unit (Y) derived from an aromatic dihydroxy compound of formula (2), and
0.01 to 1.80 parts by mass of an ultraviolet absorber (B) per 100 parts by mass of the aromatic polycarbonate resin (A),
wherein an initial YI for a 2 mm-thick plate measured in accordance with ASTM E313 is not more than 1.4,
wherein the carbonate structural units (X) and (Y) have a molar ratio (X)/(Y) in a range of 10/90 to 40/60,
wherein the aromatic polycarbonate resin (A) includes at least one selected from the group consisting of a copolymer resin comprising carbonate structural units (X) and (Y) and a resin mixture comprising an aromatic polycarbonate resin (a1) comprising the carbonate structural unit (X) and an aromatic polycarbonate resin (a2) comprising the carbonate structural unit (Y), and
wherein an amount of a cresolic hydroxy group derived from the aromatic dihydroxy compound represented by formula (1) is 60 to 160 ppm, relative to the aromatic polycarbonate resin (A);

### Claim 2 (depends on 1)

The aromatic polycarbonate resin composition of claim 1, wherein the aromatic polycarbonate resin (A) comprises an aromatic polycarbonate resin (a1) and an aromatic polycarbonate resin (a2),
wherein the carbonate structural unit (X) is present in the aromatic polycarbonate resin (a1), and
wherein the carbonate structural unit (Y) is present in the aromatic polycarbonate resin (a2).

### Claim 3 (depends on 1)

The aromatic polycarbonate resin composition of claim 1, wherein an amount of a terminal hydroxy group in the aromatic polycarbonate resin (A) is in a range of 100 to 250 ppm relative to the mass of the aromatic polycarbonate resin (A).

### Claim 4 (depends on 1)

The aromatic polycarbonate resin composition of claim 1,
wherein, for a 500-hour exposure in a xenon lightfastness test in conformity with JASO M346 under conditions of irradiance: 70 W/m2, 300 to 400 nm, BPT temperature: 89±3° C., relative humidity: 50±5%, inner side: quartz filter, outer side: soda lime filter, exposure: continuous,
a difference (ΔYI) for a 2 mm-thick plate between the initial YI before the lightfastness test and YI after the lightfastness test, as measured in accordance with ASTM E313, is not more than 2.5.

### Claim 5 (depends on 1)

A molded article comprising the aromatic polycarbonate resin composition of claim 1.

### Claim 6 (depends on 5)

The molded article of claim 5, which is a member of at least one selected from the group consisting of a display device, a cover for a display device, a protective equipment, and an in-vehicle part.