Patent application EP19183238A (EP), filed 2019-06-28
Publication number: EP3757167A1
Title: THERMOPLASTIC COMPOSITION HAVING A COEFFICIENT OF THERMAL EXPANSION CLOSELY MATCHED TO ALUMINUM
Abstract: [0001]    A thermoplastic composition includes from about 40 wt% to about 60 wt% polycarbonate homopolymer or copolymer, from about 15 wt% to about 30 wt% styrene acrylonitrile copolymer, from about 13 wt% to about 15 wt% flat glass fiber, and from about 9 wt% to about 11 wt% round glass fiber. Methods for making a thermoplastic composition include forming a mixture from the recited components and extruding or molding the mixture to form the composition.
IPC codes: C08L  69/    00            A I
Claims: number: 1
text: A thermoplastic composition, comprising:
number: 2
text: The thermoplastic composition according to claim 1, comprising 50 wt% to 55 wt% polycarbonate homopolymer or copolymer and 20 wt% to 25 wt% styrene acrylonitrile copolymer.
number: 3
text: The thermoplastic composition according to claim 1 or 2, comprising 14 wt% flat glass fiber and 10 wt% round glass fiber.
number: 4
text: The thermoplastic composition according to any of claims 1 to 3, wherein the composition has a coefficient of thermal expansion of from 22 to 29 micron per meter per degree Celsius (µm/m/°C) as determined in accordance with ISO 11359.
number: 5
text: The thermoplastic composition according to any of claims 1 to 4, wherein the composition has a coefficient of thermal expansion of from 23 to 27 µm/m/°C as determined in accordance with ISO 11359.
number: 6
text: The thermoplastic composition according to any of claims 1 to 5, wherein the composition has a melt flow rate (MFR) of at least 30 cubic centimeters per 10 minutes (cm<3>/10 min) as tested in accordance with ISO 1133.
number: 7
text: The thermoplastic composition according to any of claims 1 to 6, wherein the composition has a melt flow rate (MFR) of at least 35 cm<3>/10 min as tested in accordance with ISO 1133.
number: 8
text: The thermoplastic composition according to any of claims 1 to 7, wherein the polycarbonate homopolymer or copolymer has a molecular weight of 1,500 to 100,000 g/mol as determined by gel permeation chromatography (GPC) and calibrated to polycarbonate standards.
number: 9
text: An article comprising the thermoplastic composition according to any of claims 1 to 8.
number: 10
text: The article according to claim 9, wherein the article is a housing for a personal or commercial electronics device.
number: 11
text: The article according to claim 10, wherein the housing comprises the thermoplastic composition and an aluminum component, and wherein the thermoplastic composition is bonded to the aluminum component.
number: 12
text: A method for making a thermoplastic composition, comprising:
number: 13
text: The method according to claim 12, wherein the mixture comprises 50 wt% to 55 wt% polycarbonate homopolymer or copolymer, 20 wt% to 25 wt% styrene acrylonitrile copolymer, 14 wt% flat glass fiber and 10 wt% round glass fiber.
number: 14
text: The method according to claim 12 or 13, wherein
the composition has a coefficient of thermal expansion of from 23 to 27 micron per meter per degree Celsius (µm/m/°C) as determined in accordance with ISO 11359, and
the composition has a melt flow rate (MFR) of at least 35 cm<3>/10 min as tested in accordance with ISO 1133.
number: 15
text: The method according to any of claims 12 to 14, wherein the polycarbonate homopolymer or copolymer has a molecular weight of 1,500 to 100,000 g/mol as determined by gel permeation chromatography (GPC) and calibrated to polycarbonate standards.
Office action: search_report, dated 2020-12-30
Prior art cited: ref_id: US7786246B2
ref_type: patent
severity: background
ref_id: US8779033B2
ref_type: patent
severity: background
ref_id: JP2007070468A
ref_type: patent
severity: background
ref_id: JP2007070468
ref_type: patent
severity: background
ref_id: US8779033
ref_type: patent
severity: background
Final disposition: pending (2020-12-30)