# US 10,767,043 B2 · Aromatic polycarbonate resin composition and molded article of the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,043 B2 - Document ID: US10767043B2 - Status: Granted - Kind: B2 - Application number: 15/758,011 - Filed: 2016-09-27 - Published: 2018-07-19 - Granted: 2020-09-08 - Earliest claimed: 2015-11-27 - Assignees: Mitsubishi Enigineering-Plastics Corporation - Applicants: Mitsubishi Engineering-Plastics Corporation - Inventors: Makoto Egawa - Web page: https://patentgrep.com/patent/US10767043B2 ## CPC - C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates - G02B 1/045: {Light guides} - B60Q 1/04: the devices being headlights - B60Q 2400/30: Daytime running lights [DRL], e.g. circuits or arrangements therefor - C08K 2201/014: Additives containing two or more different additives of the same subgroup in C08K - C08L 2201/08: Stabilised against heat, light or radiation or oxydation - C08L 2203/20: use in electrical or conductive gadgets - F21S 43/235: Light guides - G02B 6/0001: {specially adapted for lighting devices or systems (lighting or signalling on vehicles using light guides B60Q1/00; lighting devices for vehicle dashboards B60Q3/10; lighting devices for vehicle interior using light guides B60Q3/62; lighting devices mounted on the vehicle rear part using light guides F21S43/235; measuring arrangements having light conducting pointers G01D13/265; illumination of liquid crystal displays G02F1/1336; illuminated signs G09F13/00)} - G02B 6/0065: {Manufacturing aspects; Material aspects} - 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 - B60Q: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS ## Abstract Provided is an aromatic polycarbonate resin composition that is excellent in terms of hue and thermal yellowing-inhibiting effect and is suitable for light guide members incorporated in automobile lighting devices. The aromatic polycarbonate resin composition comprises: 100 parts by mass of an aromatic polycarbonate resin (A); 0.001 to 0.1 parts by mass of a phosphite stabilizer (B-I) as a phosphorus-based stabilizer (B) having a spiro ring skeleton; 0.01 to 0.5 parts by mass of a phosphite stabilizer (B-II) as a phosphorus-based stabilizer (B) represented by general formula (II) below; 0.05 to 2 parts by mass of a polybutylene glycol compound (C); and 0.0005 to 0.2 parts by mass of an epoxy compound (D). In the formula (II), R21 to R25 each independently represent a hydrogen atom, an aryl group having 6 to 20 carbon atoms, or an alkyl group having 1 to 20 carbon atoms. ## Claims ### Claim 1 An aromatic polycarbonate resin composition consisting of: 100 parts by mass of an aromatic polycarbonate resin (A); 0.001 to 0.1 parts by mass of a phosphite stabilizer (B-I) having a Spiro ring skeleton; 0.03 to 0.3 parts by mass of a phosphite stabilizer (B-II) represented by formula (II); 0.05 to 2 parts by mass of a polybutylene glycol compound (C) having a number average molecular weight of 200 to 800; and 0.0005 to 0.2 parts by mass of an epoxy compound (D), where R21 to R25 each independently represent a hydrogen atom, an aryl group having 6 to 20 carbon atoms, or an alkyl group having 1 to 20 carbon atoms, wherein the phosphite stabilizer (B-I) having a spiro ring skeleton is bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphate, and wherein a mass ratio of a content of the phosphite stabilizer (B-I) and a content of the phosphite stabilizer (B-II) is phosphite stabilizer (B-I):phosphite stabilizer (B-II) within a range of 1:1 to 1:30. ### Claim 2 (depends on 1) The aromatic polycarbonate resin composition according to claim 1, wherein a total content of the phosphite stabilizer (B-I) and the phosphite stabilizer (B-II) is 0.05 to 0.2 parts by mass relative to 100 parts by mass of the aromatic polycarbonate resin (A). ### Claim 3 (depends on 1) The aromatic polycarbonate resin composition according to claim 1, wherein a YI value at a length of 300 mm measured for a 300 mm long-optical-path molded article obtained by performing injection molding on the aromatic polycarbonate resin composition is 20 or less. ### Claim 4 (depends on 1) A molded article obtained by molding the aromatic polycarbonate resin composition according to claim 1. ### Claim 5 (depends on 4) The molded article according to claim 4, wherein the molded article is a light guide member. ### Claim 6 (depends on 5) The molded article according to claim 5, wherein the molded article is a light guide member incorporated in an automobile lighting device. ### Claim 7 (depends on 1) The aromatic polycarbonate resin composition according to claim 1, comprising 0.005 to 0.1 parts by mass of the phosphite stabilizer (B-I) having a spiro ring skeleton. ### Claim 8 (depends on 1) The aromatic polycarbonate resin composition according to claim 1, wherein a mass ratio of a content of the phosphite stabilizer (B-I) and a content of the phosphite stabilizer (B-II) is phosphite stabilizer (B-I):phosphite stabilizer (B-II) within a range of 1:1 to 1:15, and a total content of the phosphite stabilizer (B-I) and the phosphite stabilizer (B-II) is 0.05 to 0.2 parts by mass relative to 100 parts by mass of the aromatic polycarbonate resin (A).