Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – With internal application of fluid pressure
Patent
1996-09-05
1999-10-05
Reddick, Judy M.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
With internal application of fluid pressure
2643281, 26433111, 524140, 524141, 524136, 524143, B29D 2200
Patent
active
059619155
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Fields
The present invention relates to a flame retardant, high precision resin mechanical part for use in an office automation machine, which is made by injection molding a thermoplastic resin composition. More particularly, the present invention is concerned with a flame retardant, high precision resin mechanical part for use in office automation machines required to function with high accuracy and high precision, which part is made by injection molding a thermoplastic resin composition comprising: (A) an amorphous thermoplastic resin; (B) an inorganic filler in a scale form; and (C) a specific phosphoric acid ester. The high precision resin mechanical part of the present invention is free from conventionally experienced disadvantages, such as volatilization of a flame retardant contained in the resin, smoking caused by the volatilization of the flame retardant and occurrence of MD (mold deposit) during the production thereof by molding, and bleeding of the flame retardant during the use thereof. Further, the mechanical part of the present invention is unlikely to suffer from warpage, and has an advantageously small shrinkage ratio during the production thereof by molding. Therefore, the mechanical part of the present invention has not only high precision but also various excellent mechanical properties, such as extremely low anisotropy in linear expansion coefficient, and excellent vibration characteristics. The high precision resin mechanical part of the present invention can be advantageously used as a mechanical part for high precision machines which are required to function with high accuracy and high precision even under various stringent conditions. Examples of such high precision machines include computers, game machines, sound-reproducing systems, audio-visual machines, copiers, printers, facsimile machines, personal computers, word processors, portable communication apparatus and composite machines composed thereof.
2. Technical Background
Recently, in various fields, such as automobiles, office machines, computers and household electric appliances, it has been attempted to substitute a resin part for parts which have conventionally been made from a metallic material, such as sheet metals and die-casted aluminum. Such an attempt has been made because a part made from a resin is advantageous in that such a resin part has not only light weight, but also can be produced with high productivity at low cost. Therefore, there is an increasing demand for reinforced resins which can be substituted for metallic materials in producing a mechanical part. Particularly, there is a strong demand for reinforced resins which can be used for producing mechanical parts for OA (office automation) machines, such as copiers, printers, facsimile machines, CD-ROMs, personal computers, word processors and are OA machines which are equipped with a printing mechanism, such as a dry-type, diazo-type, LB (laser beam)-type, BJ (bubble jet)-type, dot-type or heat sensitive-type printing mechanism.! In accordance with such a strong demand for reinforced resins, it has been intensively studied to develop amorphous thermoplastic resins (e.g., a reinforced, flame retardant polyphenylene ether resin and a reinforced, flame retardant polycarbonate resin) which have excellent mechanical properties and excellent molded form characteristics, so as to produce from such resins mechanical parts which have conventionally been produced from metallic materials, such as sheet metals and die-casted aluminum.
It is a requisite that a resin mechanical part of an OA machine have excellent molded form characteristics, mechanical properties (e.g., rigidity and strength), heat resistance, flame retardancy, dimensional precision and dimensional stability.
Among these properties, the requirements for dimensional precision and dimensional stability are most strict. For example, with respect to the mechanical part of a CD-ROM, when a traverse base, which guides and holds an optical lens unit, has a dimensional
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Nabeshima Katsumi
Toyouchi Kaoru
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