Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1999-04-15
2000-10-10
Nutter, Nathan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524430, 524437, 435809, 436809, C08K 328, C08K 338, C08K 552
Patent
active
061302791
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a resin composition comprising a poly(phenylene sulfide) resin and .alpha.-alumina (i.e., aluminum oxide powder of an .alpha.-crystal system), and particularly to a resin composition which comprises a poly(phenylene sulfide) resin and .alpha.-alumina highly filled into the resin and has excellent heat resistance, thermal conductibility and melt-flow properties. The present invention also relates to a resin composition suitable for use as a resin material for plastic microplates used in application fields such as the analysis of biochemical or biological specimens.
BACKGROUND ART
Injection-molded articles of thermoplastic resins are used in a wide variety of fields because of their high freedom of shape and excellent mass productivity. With the advancement of thermoplastic molding materials in recent years, various functions have been imparted to injection-molded articles, and so such molded articles have come to be used even as, for example, parts substitutive for the conventional metallic materials. However, the resin materials have an extremely low heat conductivity compared with the metallic materials, so that their developments in, for example, application fields of which good heat radiating property is required are limited.
More specifically, for example, a poly(phenylene sulfide) resin (hereinafter abbreviated as "PPS resin") is an engineering plastic excellent in heat resistance, flame retardancy, chemical resistance, dimensional stability, mechanical properties, electrical properties and the like, and use applications of injection-molded articles thereof are spread as electrical and electronic parts, precision instrument parts, automotive parts, etc. and are also developed into fields in which metallic materials have heretofore been used. However, the PPS resins have an extremely low heat conductivity, and so molded articles thereof are poor in thermal conductibility and heat radiating property and fail to efficiently radiate heat generated from various instruments and apparatus. As a result, in some cases, instruments and apparatus equipped with a part made of such a PPS resin may accumulate heat to a high temperature or have disadvantages such as melting, deterioration, decomposition, deformation, cracking and or the like of the PPS resin-made part.
Accordingly, it is desired to impart high thermal conductibility to heat-resistant thermoplastic resins such as PPS resins so as to be able to apply them to fields of various molded articles, of which good thermal conductibility and heat radiating property are required.
A microplate is an example of a resinous molded article of which high thermal conductibility is required. Various kinds of plastic microplates are used upon the analysis of a biochemical or biological specimen such as DNA, RNA or cells. A number of wells (recessed compartments) is generally provided in such a microplate. A variety of operations such as amplification of DNA, cell growth, and detection and quantitative determination of various materials or specimens is conducted in such wells. However, many of the conventional plastic microplates have not been suitable for use at a high temperature, since they are made from a general-purpose polymer such as polystyrene or polypropylene and are hence insufficient in heat resistance. It has also been difficult to heat such a plastic microplate to a target temperature in a short period of time due to their low heat conductivity.
These problems will hereinafter be described by specific examples. A polymerase chain reaction (PCR) method is a method in which an intended DNA in a specified region is amplified in a great amount from a small amount of a DNA specimen, and is applied to genetic diagnosis techniques, isolation and analysis of unknown genes, etc. In the PCR method, artificial single-stranded DNA fragments of 15 to 20 bases, which will serve as respective complementary primers to both 3'-terminal sides of a double-stranded DNA (100 to several thousands bases), are provided in great
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Database WPI, Section Ch, Week 199235, Derwent Publications Ltd., London, GB; AN 1992-289001.
Suzuki Keiichiro
Tada Masahito
Kureha Kagaku Kogyo K.K.
Nutter Nathan M.
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