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
1997-04-07
1999-07-27
Cooney, Jr., John 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...
524410, 524411, 524412, 524431, 524432, 524519, C08K 310
Patent
active
059291540
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a flame retarded polystyrenic resin composition comprising a styrenic polymer having the syndiotactic configuration as the main component thereof and a molded product prepared by using the resin composition. More particularly, the present invention relates to a flame retarded polystyrenic resin composition having excellent heat stability, water resistance, mechanical strength, and electric insulating property as well as excellent heat stability during molding, and advantageously used as a material of parts in the electric and electronic fields such as connectors, electric parts in the automobile field such as connectors, and other useful parts, and a molded product prepared by using the resin composition.
PRIOR ART OF THE INVENTION
Heretofore, styrenic polymers having the syndiotactic configuration (occasionally referred to as SPS hereinafter) have been used as a material for electric and electronic parts, automobile parts, and machine tool parts because of the excellent mechanical properties, heat resistance, and processability in molding. Particularly in the electric and electronic fields, the level of flame retardation required for materials recently tends to become higher .
As for flame retardation of SPS, flame retardation satisfying UL-94 by Underwriters Laboratory Inc. of USA has been examined by combined use of a flame retardant containing a halogen, such as a brominated polystyrene, or a flame retardant containing phosphorus and an auxiliary flame retardant, such as antimony oxides, as described in the specifications of Japanese Patent Application Laid-Open No. Heisei 2(1990)-92947, Japanese Patent Application Laid-Open No. Heisei 2(1990)-92948, and Japanese Patent Application Laid-Open No. Heisei 5(1993)-247292. The flame retardation by addition of a flame retardant or an auxiliary flame retardant has a problem that the proper mechanical strength of SPS is decreased though the flame retardation of SPS is improved.
The temperature of heat molding of SPS is higher than that of conventional thermoplastic resins because of the proper characteristics of SPS. The temperature of the resin during molding reaches about 300.degree. C. Depending on the conditions of molding, a still higher temperature or a longer retention time in a heated apparatus may be required. Therefore, the above SPS resin compositions containing flame retardants have problems such as decrease in mechanical strength, change in color of molded articles, formation of foams in molded articles by gases generated by decomposition, and deterioration of appearance by burning by gas.
The above SPS resin compositions containing flame retardants have also other problems such as contamination of molds by corrosion of metals by the decomposition products and attachment of materials to the molds, occurrence of incomplete demolding, and contamination of molded articles with foreign substances.
Under the circumstances described above, the present inventors conducted extensive studies to solve the above problems and obtain a flame retarded polystyrenic composition having improved flame retarding property while the excellent proper characteristics of SPS are maintained, realizing suppressed generation of gases and decrease in materials attached to molds during heat molding, and exhibiting excellent heat stability so that a molded product is provided with little change in color and mechanical strength.
SUMMARY OF THE INVENTION
As the result of the above studies, it was discovered that the above problems can be solved by a polystyrenic resin composition obtained by adding specific amounts of a flame retardant having a specific structure and an auxiliary flame retardant having a specific structure to SPS or a resin comprising SPS and resins other than SPS. The present invention has been completed on the basis of the discovery.
The present invention provides a flame retarded polystyrenic resin composition comprising: (A) 100 parts by weight of a resin which comprises (a-1) 1 to 100% by weight
REFERENCES:
Patent Abstracts of Japan, vol. 018, No. 687 (E-1651), Dec. 26, 1994.
Database WPI, Derwent Publications Ltd., London, GB; AN 94-216369 XP002056373 & TW 224 479 A (Chi Mei Corp), Jun. 1, 1994.
Iwashita Tohru
Masuyama Akitoshi
Mihara Masami
Yamao Shinobu
Cooney Jr. John M.
Idemitsu Petrochemical Co. Ltd.
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