# US 11,078,360 B2 · Polycarbonate/polycarbonate-polysiloxane composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,360 B2 - Document ID: US11078360B2 - Status: Granted - Kind: B2 - Application number: 16/520,540 - Filed: 2019-07-24 - Published: 2020-01-30 - Granted: 2021-08-03 - Earliest claimed: 2018-07-26 - Assignees: Lotte Advanced Materials Co., Ltd. - Applicants: Lotte Advanced Materials Co., Ltd. - Inventors: Nam Hyun Kim; Young Mi Kim; Bong Jae Lee; Sang Hyun Hong - Web page: https://patentgrep.com/patent/US11078360B2 ## CPC - C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates - C08G 64/186: {containing polysiloxane sequences} - C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) - C08L 83/04: Polysiloxanes - C08L 83/10: Block- or graft-copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00) - C08G 77/448: containing polycarbonate sequences - 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 2205/035: containing four or more polymers in a blend - 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 ## Abstract A thermoplastic resin composition and a molded article formed using the same. The thermoplastic resin composition includes: a polycarbonate resin; a first polycarbonate-polysiloxane copolymer resin; a second polycarbonate-polysiloxane copolymer resin; and a glycol-modified polyester resin, wherein the first polycarbonate-polysiloxane copolymer resin includes a polysiloxane block having an average degree of polymerization of about 30 to about 45 and the second polycarbonate-polysiloxane copolymer resin includes a polysiloxane block having an average degree of polymerization of about 70 to about 100. The thermoplastic resin composition can have good properties in terms of transparency, impact resistance, chemical resistance, and/or hydrolysis resistance. ## Claims ### Claim 1 A thermoplastic resin composition comprising: about 35 wt % to about 55 wt % of a polycarbonate resin; about 25 wt % to about 45 wt % of a first polycarbonate-polysiloxane copolymer resin; about 5 wt % to about 25 wt % of a second polycarbonate-polysiloxane copolymer resin; and about 0.1 wt % to about 2 wt % of a glycol-modified polyester resin, wherein the first polycarbonate-polysiloxane copolymer resin comprises a polysiloxane block having an average degree of polymerization of about 30 to about 45 and the second polycarbonate-polysiloxane copolymer resin comprises a polysiloxane block having an average degree of polymerization of about 70 to about 100, wherein a weight ratio of the first polycarbonate-polysiloxane copolymer resin to the second polycarbonate-polysiloxane copolymer resin ranges from about 1:0.2 to about 1:0.7, wherein the glycol-modified polyester resin has a 1,4-cyclohexane dimethanol (CHDM) content of about 20 mol % to 100 mol % in a diol component, and wherein the thermoplastic resin composition has an impact strength of about 50 cm to 90 cm, as measured on a 2 mm thick specimen using a drop impact tester in accordance with the Dupont drop test by dipping the specimen in a thinner solution for 2.5 minutes, drying the specimen at 80° C. for 20 minutes, allowing the specimen to be left at room temperature for 24 hours, and measuring a height from which dropping a 500 g dart results in breakage of the specimen. ### Claim 2 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the first polycarbonate-polysiloxane copolymer resin comprises about 1 wt % to about 10 wt % of the polysiloxane block and about 90 wt % to about 99 wt % of a polycarbonate block. ### Claim 3 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the second polycarbonate-polysiloxane copolymer resin comprises about 1 wt % to about 10 wt % of the polysiloxane block and about 90 wt % to about 99 wt % of a polycarbonate block. ### Claim 4 (depends on 1) The thermoplastic resin composition according to claim 1, wherein each of the first polycarbonate-polysiloxane copolymer resin and the second polycarbonate-polysiloxane copolymer resin has a weight average molecular weight of about 15,000 g/mol to about 50,000 g/mol. ### Claim 5 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a haze of about 6.5% or less, as measured on a 2.5 mm thick specimen in accordance with ASTM D1003, and a light transmittance of about 90% or more, as measured on a 1.0 mm thick specimen in accordance with ASTM D1003. ### Claim 6 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a notched Izod impact strength of about 60 kgf·cm/cm to about 100 kgf·cm/cm, as measured on a ⅛″ thick specimen in accordance with ASTM D256. ### Claim 7 (depends on 1) The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin composition has a tensile strength retention rate of about 80% or more, as calculated according to Equation 1: Tensile strength retention rate (%)=(TS1/TS0)×100 [Equation 1] wherein TS0 denotes an initial tensile strength of a 3.2 mm thick specimen, as measured at a tensile rate of 50 mm/min in accordance with ASTM D638, and TS1 denotes a tensile strength of the thermoplastic resin composition, as measured at a tensile rate of 50 mm/min in accordance with ASTM D638 after leaving the specimen in a chamber at 85° C. and 85% relative humidity (RH) for 120 hours. ### Claim 8 (depends on 1) A molded article formed of the thermoplastic resin composition according to claim 1.