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AssigneePolyplastics Co., Ltd.
InventorsHirotaka Miyazaki, Tomoyuki Aketa, Haruji Murakami, Takayuki Ishikawa, Kazuhito Kobayashi, Ayako Migita
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A thermoplastic resin composition comprising a thermoplastic resin (A) not forming an anisotropic melt phase and a liquid crystal polymer (B) capable of forming an anisotropic melt phase, an injection molding method thereof and an injection molded article capable of providing a thin molded article having excellent mechanical strength. A thermoplastic resin composition (C) comprises 99 to 50 wt. % of the thermoplastic resin (A) and 1 to 50 wt. % of the liquid crystal polymer (B). The liquid crystal polymer (B) is microscopically dispersed in an island form in the matrix phase of the thermoplastic resin (A) so that when the composition (C) is heat-treated at a temperature not lower than the melting point of the liquid crystal polymer (B) under a non-load state and is then cooled, the liquid crystal polymer (B) has a weight average particle diameter within the range of 10 to 40 micrometers and at least 80 wt. % thereof has a particle diameter within the range of 0.5 to 60 micrometers. The injection molding method comprises carrying out injection molding of the thermoplastic resin composition (C) at a processing temperature greater than or equal to the flow beginning temperature of the liquid crystal polymer (B) and at a gate passage rate of the molten resin of at least 500 m/min, and an injection molded article characterized in that the liquid crystal polymer (B) is dispersed in a fibrous form in the matrix phase of the thermoplastic resin (A) at a mean aspect ratio of at least 6.
An injection molding method which comprises the steps of:
An injection molding method characterized in that a thermoplastic resin composition comprising 99 to 50 wt. % of a thermoplastic resin (A) not forming an anisotropic melt phase and 1 to 50 wt. % of a liquid crystal polymer (B) capable of forming an anisotropic melt phase (the total of the two accounting for 100 wt. %) and 0.01 to 0.5 parts by weight of a phosphorus-containing compound with respect to 100 parts by weight in total of the thermoplastic resin (A) and the liquid crystal polymer (B) is injection-molded at a processing temperature greater than or equal to the flow beginning temperature of the liquid crystal polymer (B) and at a gate passage rate of the molten resin of at least 500 m/min.
An injection molded article formed of a thermoplastic resin composition comprising 99 to 50 wt. % of a thermoplastic resin (A) not forming an anisotropic melt phase, 1 to 50 wt. % of a liquid crystal polymer (B) capable of forming an anisotropic melt phase (the total of the two accounting for 100 wt. %) and 0.01 to 0.5 parts by weight of a phosphorus-containing compound with respect to 100 parts by weight in total of the thermoplastic resin (A) and the liquid crystal polymer (B), wherein the liquid crystal polymer (B) is dispersed in a fibrous form in the matrix phase of the thermoplastic resin (A) at a mean aspect ratio of at least 6, and the liquid crystal polymer (B) is microscopically dispersed in the form of islands in the matrix phase of the thermoplastic resin (A) so that when the injection-molded article is heat-treated at a temperature not lower than the melting point of the liquid crystal polymer (B) under a non-load state and is then cooled, the liquid crystal polymer (B) has a weight average particle diameter within the range of 10 to 40 micrometers and at least 80 wt. % thereof has a particle diameter within the range of 0.5 to 60 micrometers and said injection molded article is molded at a processing temperature greater than or equal to the flow beginning temperature of the liquid crystal polymer (B).
An injection molded article formed of a thermoplastic resin composition comprising 99 to 50 wt. % of a thermoplastic resin (A) not forming an anisotropic melt phase, 1 to 50 wt. % of a liquid crystal polymer (B) capable of forming an anisotropic melt phase (the total of the two accounting for 100 wt. %) and 0.01 to 0.5 parts by weight of a phosphorus-containing compound with respect to 100 parts by weight in total of the thermoplastic resin (A) and the liquid crystal polymer (B), wherein the liquid crystal polymer (B) is dispersed in a fibrous form in the matrix phase of the thermoplastic resin (A) at a mean aspect ratio of at least 6;
An injection molding method of a thermoplastic resin composition which comprises the steps of:
An injection molded article formed of a thermoplastic resin composition comprising 99 to 50 wt. % of a thermoplastic resin (A') having a melting point or a softening point of not higher than 210.degree. C. and being formed of one or more members selected from polyolefin (co)polymers, styrene (co)polymers, polyamide (co)polymers, polyacrylate, and polyacetal (co)polymers, 1 to 50 wt. % of a liquid crystal polymer (B') having a flow beginning temperature of 80-210.degree. C. and being capable of forming an anisotropic melt phase (the total of the two accounting for 100 wt. %) and 0.01 to 0.5 parts by weight of a phosphorus-containing compound with respect to 100 parts by weight in total of the thermoplastic resin (A') and the liquid crystal polymer (B'), wherein the liquid crystal polymer (B') is dispersed in a fibrous form in the matrix phase of the thermoplastic resin (A') at a mean aspect ratio of at least 6, and that the liquid crystal polymer (B') is microscopically dispersed in the form of islands in the matrix phase of the thermoplastic resin (A') so that when the injection-molded article is heat-treated at a temperature not lower than the melting point of the liquid crystal polymer (B') under a non-load state and is then cooled, the liquid crystal polymer (B') has a weight average particle diameter within the range of 10 to 40 micrometers and at least 80 wt. % thereof has a particle diameter within the range of 0.5 to 60 micrometers.
Dependencies are inferred from the claim text.