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...
Reexamination Certificate
2001-02-22
2002-12-31
Sanders, Kriellion A. (Department: 1714)
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...
C524S464000
Reexamination Certificate
active
06500889
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a stabilized flame-retarded thermoplastic resin composition obtainable, e.g., by adding a specific additive to an original flame-retarded thermoplastic resin composition composed of a thermoplastic resin and a brominated flame-retardant, and it can be used widely in the fields where flame retardancy or flame retardativeness is required.
2. Prior Art
For flame retardation of a thermoplastic resin, it is the common practice to add thereto a flame retardant or a flame retarding assistant such as halogenated compound, phosphorous compound, antimony trioxide or the like. Among these flame retardants, a halogenated compound, particularly a brominated compound is used frequently.
In general, however, such addition of a brominated flame retardant to a thermoplastic resin is accompanied with the problem that a marked deterioration in heat stability of the resulting flame retarded thermoplastic resin occurs upon forming or molding, thereby lowering the commodity value of the molded or formed product. The below-described techniques have already been disclosed to overcome the above-described problems.
(1) A technique of adding a halogen-containing organic flame-retardant, a hydrotalcite stabilizer and a flame retarding assistant to a thermoplastic or thermosetting resin (Japanese Patent Application Laid-Open (Kokai) No. Sho 60-1241), thereby overcoming various problems such as corrosion generation upon molding or forming of the resulting flame-retarded resin composition, and yellowing, lowering in heat resistance, lowering in weather resistance and the like of the molded or formed product. The hydrotalcite stabilizer used according to this technique is the same as the hydrotalcite (Component (b)) to be used according to the present invention. This disclosure, however, includes neither any description of or even suggestion for the dolomite compound to be used according to the present invention nor any description of or even suggestion for the combined use of the hydrotalcite with the dolomite compound.
(2) A technique of adding a hydrotalcite solid solution to a halogen- and/or acid substance-containing synthetic resin (Japanese Patent Application Laid-Open (Kokai) No. Sho 61-174270), thereby improving rust generation resistance and coloring resistance of the resulting resin composition. The hydrotalcite solid solution used according to this technique is the same as the zinc-substituted hydrotalcite compound (Component (c)) to be used according to the present invention. This disclosure, however, includes neither any description of or even suggestion for the dolomite compound to be used according to the present invention nor any description of or even suggestion for the combined use of the hydrotalcite solid solution with the dolomite compound.
(3) A technique of adding zeolite A to a flame retarded resin composed of a polyolefin resin, styrene resin, polyester resin or nylon resin and a halogenated flame retardant (Japanese Patent Application Laid-Open (Kokai) No. Sho 62-199654), thereby improving heat stability of the resulting flame retarded thermoplastic resin. Zeolite A or zeolite containing a Group II or Group IV metal in the periodic table is the same as the zeolite compound (Component (d)) to be used according to the present invention. This disclosure, however, includes neither any description of or even suggestion for the dolomite compound to be used according to the present invention nor any description of or even suggestion for the combined use of the zeolite with the dolomite compound.
SUMMARY OF THE INVENTION
Problems to Be Solved by the Invention
It is impossible to obtain sufficient heat stabilizing effects when in accordance with the conventional technique of adding, to a flame-retarded thermoplastic resin composition composed of a thermoplastic resin and a brominated flame retardant, a hydrotalcite stabilizer as described in Japanese Patent Application Laid-Open (Kokai) No. Sho 60-1241, a hydrotalcite solid solution as described in Japanese Patent Application Laid-Open (Kokai) No. Sho 61-174270 or zeolite A as described in Japanese Patent Application Laid-Open (Kokai) No. Sho 62-199654, singly. There is accordingly a demand for the provision of a flame retarded thermoplastic resin composition excellent in heat stabilizing effects for a flame retarded thermoplastic resin composed of a thermoplastic resin and a brominated flame retardant.
Means to Solve the Problems
With the foregoing in view, the present inventors have proceeded with an extensive investigation on an additive having excellent heat stabilizing effects on a flame-retarded thermoplastic resin composed of a thermoplastic resin and a brominated flame retardant. As a result, it has been found that a flame retarded thermoplastic resin composition obtainable by adding, to an original or initial flame retarded thermoplastic resin composition composed of 100 parts by weight of a thermoplastic resin and 1 to 50 parts by weight of a brominated flame retardant, 0.05 to 5.0 parts by weight of a dolomite compound (Component (a)) has excellent heat stabilizing effects. It has also been found that a flame retarded thermoplastic resin composition obtainable by adding to an original or initial flame-retarded thermoplastic resin composition composed of 100 parts by weight of a thermoplastic resin and 1 to 50 parts by weight of a brominated flame retardant, 0.05 to 5.0 parts by weight of a dolomite compound (Component (a)), and in combination therewith, 0.01 to 5.0 parts by weight of at least one compound selected from the group consisting of a hydrotalcite (Component (b)), a zinc-substituted hydrotalcite compound (Component (c)) and a zeolite compound (Component (d)), has markedly excellent heat stabilizing effects, leading to completion of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Specific examples of the thermoplastic resin to be used according to the present invention include polyolefins such as polyethylene, polypropylene and the like, styrene resins such as polystyrene (PS), high impact polystyrene (HIPS), syndiotactic polystyrene, acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-butadiene-styrene-(&agr;-methyl)styrene copolymer, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-ethylene-styrene copolymer (AES resin), acrylonitrile-acrylic rubber-styrene copolymer (AAS resin) and the like, polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyarylate and the like, polyamides such as nylon 6, nylon 12, nylon 46, nylon 66, nylon 610, nylon 612, nylon MXD6 and the like, polycarbonate, polyacetal, vinyl acetate resin, ethylene-vinyl acetate copolymer, polyvinyl alcohol, polyvinyl acetal, polyphenylene oxide, polysulfone, polyether sulfone and polyphenylene sulfide and blended resins thereof (polymer alloys).
As the brominated flame retardant to be used according to the present invention, those ordinarily employed in this field can be used with no limitations. Among them, popularly employed are flame retardants such as brominated bisphenol A or brominated bisphenol S, brominated phenyl ether, brominated bisphenol A carbonate oligomer, brominated bisphenol A epoxy resin, brominated styrene, brominated phthalimide, brominated benzene and brominated cycloalkane.
As the brominated bisphenol A or brominated bisphenol S, compounds having 1 to 8 bromine atoms bonded to the benzene ring of the bisphenol A residue or bisphenol S residue can be mentioned. Examples thereof include monobromobisphenol A, dibromobisphenol A, tribromobisphenol A, tetrabromobisphenol A, pentabromobisphenol A, hexabromobisphenol A, octabromobisphenol A, tetrabromobisphenol A bis(2-hydroxyethyl ether), tetrabromobisphenol A bis(2-bromoethyl ether), tetrabromobisphenol A bis(1,2-dibromoethyl ether), tetrabromobisphenol A bis(propyl ether), tetrabromobisphenol A bis(3-bromopropyl ether), tetrabromobisphenol A bis(2,3-dibromopropyl ether), monobromobisphenol S, dibromobisphenol S, tribromobisphenol
Akitsu Masaharu
Ihara Kyuji
Tanaka Takeo
Yasuda Naoki
Ajinomoto Co. Inc.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sanders Kriellion A.
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