# US 2014/0155548 A1 · Aromatic polycarbonate resin composition and molded article formed therefrom > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0155548 A1 - Document ID: US20140155548A1 - Status: Published application - Kind: A1 - Application number: 14/131,800 - Filed: 2012-06-25 - Published: 2014-06-05 - Earliest claimed: 2011-07-20 - Assignees: Mitsubishi Engineering-Plastics Corporation - Inventors: Haruhiko Kurokawa; Yutaka Nishibayashi; Hiromitsu Nagashima - Web page: https://patentgrep.com/patent/US20140155548A1 ## CPC - C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract To provide an aromatic polycarbonate resin composition which has an impact resistance improved by blending of an impact strength improver and which also has an excellent transparency and a good surface hardness. The aromatic polycarbonate resin composition includes, with respect to 100 parts by mass of a resin component containing 55 to 85 percent by mass of an aromatic polycarbonate resin (A) having a mass average molecular weight of 15,000 to 40,000 and 15 to 45 percent by mass of a (meth)acrylate copolymer (B) which has a mass average molecular weight of 5,000 to 30,000 and which is composed of an aromatic (meth)acrylate unit (b1) and a methyl (meth)acrylate unit (b2) at a mass ratio (b1/b2) of 5 to 50/50 to 95, 1 to 20 parts by mass of an impact strength improver (C). A refractive index nab of the resin component at a wavelength of 589 nm and a refractive index nc of the impact strength improver (C) at a wavelength of 589 nm satisfy the following formula i). −0.01≦nab−nc≦+0.01 Formula i) ## Claims ### Claim 1 An aromatic polycarbonate resin composition, comprising: with respect to 100 parts by mass of a resin component comprising: (A) 55 to 85 percent by mass of an aromatic polycarbonate resin (A) having a mass average molecular weight of 15,000 to 40,00; and (B) 15 to 45 percent by mass of a (meth)acrylate copolymer (B) which has a mass average molecular weight of 5,000 to 30,000 and comprises (b1) an aromatic (meth)acrylate unit (b1), and (b2) a methyl (meth)acrylate unit (b2), (C) 1 to 20 parts by mass of an impact strength improver (C), wherein: in the (meth)acrylate copolymer (B), a mass ratio (b1/b2) is 5 to 50/50 to 95; and when the refractive index of the resin component at a wavelength of 589 nm is represented by nab, and the refractive index of the impact strength improver (C) at a wavelength of 589 nm is represented by nc, nab and nc satisfy formula (1): −0.01≦nab−nc≦+0.01 (1), ### Claim 2 (depends on 1) The aromatic polycarbonate resin composition according to claim 1, wherein the impact strength improver (C) comprises at least one selected from the group consisting of an MBS resin, an SBS resin, and an SEBS resin. ### Claim 3 (depends on 1) The aromatic polycarbonate resin composition according to claim 1, wherein the impact strength improver (C) is formed from a monomer having a molecular structure containing no hydroxy group. ### Claim 4 (depends on 1) The aromatic polycarbonate resin composition according to claim 1, wherein the impact strength improver (C) comprises 50 percent by mass or more of a styrene structure. ### Claim 5 (depends on 4) The aromatic polycarbonate resin composition according to claim 4, wherein the impact strength improver (C) comprises 60 to 80 percent by mass of the styrene structure. ### Claim 6 (depends on 1) The aromatic polycarbonate resin composition according to claim 1, further comprising: (D) 1 to 100 parts by mass of an E-glass reinforcing material (D), with respect to 100 parts by mass of the resin component. ### Claim 7 (depends on 1) The aromatic polycarbonate resin composition according to claim 1, wherein the haze of a plate test piece having a thickness of 2 mm formed from the resin composition, which is measured in accordance with JIS K-7105, is 30% or less. ### Claim 8 (depends on 1) An aromatic polycarbonate-resin molded article obtained by molding the aromatic polycarbonate resin composition according to claim 1. ### Claim 9 (depends on 2) The aromatic polycarbonate resin composition according to claim 2, wherein the impact strength improver (C) is formed from a monomer having a molecular structure containing no hydroxy group. ### Claim 10 (depends on 2) The aromatic polycarbonate resin composition according to claim 2, wherein the impact strength improver (C) comprises 50 percent by mass or more of a styrene structure. ### Claim 11 (depends on 2) The aromatic polycarbonate resin composition according to claim 2, further comprising: (D) 1 to 100 parts by mass of an E-glass reinforcing material (D), with respect to 100 parts by mass of the resin component. ### Claim 12 (depends on 2) The aromatic polycarbonate resin composition according to claim 2, wherein the haze of a plate test piece having a thickness of 2 mm formed from the resin composition, which is measured in accordance with JIS K-7105, is 30% or less. ### Claim 13 (depends on 2) An aromatic polycarbonate-resin molded article obtained by molding the aromatic polycarbonate resin composition according to claim 2.