# US 11,111,381 B2 · Polycarbonate resin composition for optical component, and optical component

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,111,381 B2
- Document ID: US11111381B2
- Status: Granted
- Kind: B2
- Application number: 16/603,022
- Filed: 2018-03-26
- Published: 2020-06-18
- Granted: 2021-09-07
- Earliest claimed: 2017-06-05
- Assignees: Mitsubishi Engineering-Plastics Corporation
- Applicants: Mitsubishi Engineering-Plastics Corporation
- Inventors: Keisuke Tomita; Akira Ohshima
- Web page: https://patentgrep.com/patent/US11111381B2

## CPC

- C08K 5/526: with hydroxyaryl compounds
- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08K 5/527: Cyclic esters
- C08L 71/02: Polyalkylene oxides
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- G02B 1/045: {Light guides}
- C08L 2201/08: Stabilised against heat, light or radiation or oxydation
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A polycarbonate resin composition for an optical component, the composition comprising 0.1 to 4 parts by mass of a polyalkylene glycol (B) and 0.005 to 0.5 parts by mass of a phosphorus-containing stabilizer (C) relative to 100 parts by mass of a polycarbonate resin (A), wherein the polyalkylene glycol (B) contains 40 to 80 mol % of a tetramethylene glycol unit (b1), 5 to 45 mol % of a (2-methyl)ethylene glycol unit (b2), and 5 to 50 mol % of an ethylene glycol unit (b3), and wherein at least two units selected from the tetramethylene glycol unit (b1), the (2-methyl)ethylene glycol unit (b2), and the ethylene glycol unit (b3) are contained as a copolymer component obtained by copolymerizing them.

## Claims

### Claim 1

A polycarbonate resin composition, comprising:
100 parts by mass of a polycarbonate resin (A),
0.1 to 4 parts by mass of a polyalkylene glycol (B), and
0.005 to 0.5 parts by mass of a phosphorus-comprising stabilizer (C),
wherein the polyalkylene glycol (B) comprises 52.7 to 80 mol % of a tetramethylene glycol unit (b1), 5 to 45 mol % of a (2-methyl)ethylene glycol unit (b2), and 5 to 50 mol % of an ethylene glycol unit (b3), and
wherein the polyalkylene glycol (B) is characterized by being contained as a copolymer having the tetramethylene glycol unit (b1), the (2-methyl)ethylene glycol unit (b2), and the ethylene glycol unit (b3).

### Claim 2 (depends on 1)

The polycarbonate resin composition of claim 1, wherein the polyalkylene glycol (B) comprises 52.7 to 80 mol % of the tetramethylene glycol unit (b1), 17.6 to 45 mol % of the (2-methyl)ethylene glycol unit (b2), and 5 to 29.7 mol % of the ethylene glycol unit (b3).

### Claim 3 (depends on 1)

The polycarbonate resin composition of claim 1, wherein the tetramethylene glycol unit (b1) is present in an amount of 52.7 to 58.1 mol % in the polyalkylene glycol (B).

### Claim 4 (depends on 1)

The polycarbonate resin composition of claim 1, wherein the (2-methyl)ethylene glycol unit (b2) is present in an amount of 17.6 to 30.1 mol % in the polyalkylene glycol (B).

### Claim 5 (depends on 1)

The polycarbonate resin composition of claim 1, wherein the ethylene glycol unit (b3) is present in an amount of 13.7 to 29.7 mol % in the polyalkylene glycol (B).

### Claim 6 (depends on 1)

The polycarbonate resin composition of claim 1, wherein a number average molecular weight of the polyalkylene glycol (B) is more than 1200 and less than 5000.

### Claim 7 (depends on 1)

An optical component obtained by a process comprising molding the polycarbonate resin composition of claim 1.