# US 8,784,683 B2 · Liquid crystalline polyester composition, method of producing the same and molded product manufactured from the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,784,683 B2 - Document ID: US8784683B2 - Status: Granted - Kind: B2 - Application number: 13/637,738 - Filed: 2011-12-14 - Published: 2013-01-17 - Granted: 2014-07-22 - Earliest claimed: 2010-12-28 - Assignees: Toray Industries, Inc. - Applicants: Satoshi Matsubara; Hideyuki Umetsu; Takayuki Hase - Inventors: Satoshi Matsubara; Hideyuki Umetsu; Takayuki Hase - Web page: https://patentgrep.com/patent/US8784683B2 ## CPC - C08J 3/201: {Pre-melted polymers} - C08J 5/043: {with glass fibres} - C08K 7/14: Glass - C08L 67/00: Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers - C08J 2367/03: the dicarboxylic acids and dihydroxy compounds having the hydroxy and the carboxyl groups directly linked to aromatic rings - C09K 2323/00: Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - 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) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract A liquid crystalline polyester composition contains at least 100 parts by weight of liquid crystalline polyester having different structural units and 10 to 100 parts by weight of glass fiber, wherein the glass fiber has a weight-average fiber length (Mw) of 200 to 500 μm, and content of specific glass fiber having fiber length of not less than 1500 μm is 0.1 to 5.0 percent by weight to a total amount of the glass fiber. ## Claims ### Claim 1 A liquid crystalline polyester composition, at least containing 100 parts by weight of liquid crystalline polyester having structural units (I), (II), (III), (IV) and (V) shown below and 10 to 100 parts by weight of glass fiber, wherein the glass fiber has a weight-average fiber length (Mw) of 200 to 500 μm and includes specific glass fiber having fiber length of not less than 1500 μm, and content of the specific glass fiber is 0.1 to 5.0 percent by weight to a total amount of the glass fiber ### Claim 2 (depends on 1) The liquid crystalline polyester composition according to claim 1, wherein the glass fiber has a ratio (D90/D10) of 90%-cumulative-frequency fiber length (D90) to 10%-cumulative-frequency fiber length (D10) in the cumulative weight fiber length distribution curve of not greater than 5.0. ### Claim 3 (depends on 1) The liquid crystalline polyester composition according to claim 1, wherein the glass fiber contained in the liquid crystalline polyester composition has a mode (S) of fiber length in a fiber length frequency distribution that is not less than 0.25 times but less than 0.90 times as much as the weight-average fiber length (Mw). ### Claim 4 (depends on 1) The liquid crystalline polyester composition according to claim 1, wherein content of the structural unit (I) is 65 to 80 mole percent relative to a total amount of the structural units (I), (II) and (III), content of the structural unit (II) is 55 to 85 mole percent relative to a total amount of the structural units (II) and (III), and content of the structural unit (IV) is 50 to 95 mole percent relative to a total amount of the structural units (IV) and (V). ### Claim 5 (depends on 1) A method of producing the liquid crystalline polyester composition according to claim 1 comprising: melt-kneading at least liquid crystalline polyester having structural units (I), (II), (III), (IV) and (V) shown below and the glass fiber by an extruder having a plurality of supply ports; supplying the liquid crystalline polyester from a first supply port located on an extruder drive system side; supplying the glass fiber from a second supply port located downstream of the first supply port; and controlling melt viscosity of the liquid crystalline polyester at a shear rate of 100 s−1 in a glass fiber supply section to 100 to 5000 Pa·s ### Claim 6 (depends on 1) A molded product manufactured by injection molding the liquid crystalline polyester composition according to claim 1. ### Claim 7 (depends on 6) A connector comprising the molded product according to claim 6. ### Claim 8 (depends on 2) The liquid crystalline polyester composition according to claim 2, wherein the glass fiber contained in the liquid crystalline polyester composition has a mode (S) of fiber length in a fiber length frequency distribution that is not less than 0.25 times but less than 0.90 times as much as the weight-average fiber length (Mw). ### Claim 9 (depends on 2) The liquid crystalline polyester composition according to claim 2, wherein content of the structural unit (I) is 65 to 80 mole percent relative to a total amount of the structural units (I), (II) and (III), content of the structural unit (II) is 55 to 85 mole percent relative to a total amount of the structural units (II) and (III), and content of the structural unit (IV) is 50 to 95 mole percent relative to a total amount of the structural units (IV) and (V). ### Claim 10 (depends on 2) A method of producing the liquid crystalline polyester composition according to claim 2 comprising: melt-kneading at least liquid crystalline polyester having structural units (I), (II), (III), (IV) and (V) shown below and glass fiber by an extruder having a plurality of supply ports; supplying the liquid crystalline polyester from a first supply port located on an extruder drive system side; supplying the glass fiber from a second supply port located downstream of the first supply port; and controlling melt viscosity of the liquid crystalline polyester at a shear rate of 100 s−1 in a glass fiber supply section to 100 to 5000 Pa·s ### Claim 11 (depends on 2) A molded product manufactured by injection molding the liquid crystalline polyester composition according to claim 2. ### Claim 12 (depends on 11) A connector comprising the molded product according to claim 11.