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
2001-09-13
2003-11-18
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...
C524S100000, C524S267000, C524S418000, C524S423000, C524S404000, C524S424000, C524S430000, C524S506000
Reexamination Certificate
active
06649680
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a flame retardant resin composition having a good fluidity and excellent recycling property, and can yield a molded article having an excellent rigidity and flame retardancy.
PRIOR ART
To impart thermoplastic resins with a flame retardancy as high as V-0 or V-1 according to the UL94 standards, molded articles are composed of resin compositions in which red phosphorus, an organophosphorus compound such as triphenyl phosphate or the like is blended and used as a flame retardant. However, it is pointed out that, when these molded articles are discarded in a landfill, there may occur contamination of water by enrichment of seas, rivers, lakes or ponds due to elution of the phosphorus therefrom.
As an example of using flame retardants that contain no phosphorus, technologies that realize flame retardancy by compounding thermoplastic resins with silicone compounds are disclosed in JP-A 6-128434, JP-A 6-263948, JP-A 8-176425, JP-A 8-176427, and JP-A 11-140294. However, in these technologies, since the flame retardant compositions used have excellent flame retardancy and a poor fluidity, when they are applied to housing or chassis applications for computer monitors and the like, the molded articles obtained have poor moldability, particularly in thin portions. As a result, when meeting the requirements of size and weight reduction of recent years, a problem arises that the molded articles have insufficient rigidity. To improve fluidity and increase moldability, a method of compounding a plasticizer may be used. However, there arises another problem of a decreasing heat resistance of the molded articles, indicated by deflection temperature under load.
An object of the present invention is to provide a flame retardant resin composition having a good fluidity and excellent recycling property, to yield a molded article having excellent rigidity and flame retardancy and is particularly applicable for a molded article having a small thickness. Another object of the present invention is to provide a molded article from such a composition.
DISCLOSURE OF THE INVENTION
The present invention provides, as a solving means, a flame retardant resin composition comprising 100 parts by weight of a thermoplastic resin (A); 0.5 to 100 parts by weight of a liquid crystal polymer (B); and 0.1 to 30 parts by weight of a silicone compound (C) as a flame retardant, and a molded article comprising the composition.
DETAILED DESCRIPTION OF THE INVENTION
The thermoplastic resin used as the component (A) in the present invention includes at least one resin selected from the group consisting of polycarbonate resins, polyamide resins, polystyrene resins, polyester resins, polyolefin resins, polyurethane resins, polyether resins, polyester-ether resins, polyamide ether resins and polyphenylene oxide resins. Among these, polycarbonate resins are preferred.
The polycarbonate resins include those obtained through the reaction of divalent phenols with carbonate precursors by a known solution process or melting process.
The divalent phenols include at least one selected from 2,2-bis(4-hydroxyphenyl)propane(bisphenol A), bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, bis(4-hydroxyphenyl) sulfide, bis(4-hydroxyphenyl)sulfone etc. Among these, bis(4-hydroxyphenyl)alkanes are preferred, and bisphenol A is particularly preferred.
The carbonate precursors include at least one selected from diaryl carbonates such as diphenyl carbonate, dialkyl carbonates such as dimethyl carbonate and diethyl carbonate, carbonyl halides such as phosgene, and haloformates such as dihaloformates of a divalent phenol, etc.
Although the number average molecular weight of the polycarbonate resins is not particularly limited, it is preferable that the molecular weight ranges from about 17,000 to about 32,000 to impart mechanical strength required for practical use to the molded articles obtained from the composition.
The polyamide resins include polyamide resins and the copolymers thereof formed from diamines and dicarboxylic acids. Specifically, nylon-66, polyhexamethylene sevacamide (nylon 6-10), polyhexamethylene dodecanamide (nylon 6-12), polydodecamethylene dodecanamide (nylon 1212), polymethaxylylene adipamide (nylon MXD6), polytetramethylene adipamide (nylon 46), and the mixtures or copolymers of these; copolymers such as nylon 6/66, nylon 66/6T containing 50 mole % or less of component 6T (6T: polyhexamethylene telephthalamide), nylon 66/6I containing 50 mole % or less of component 6I (6I: polyhexamethylene isophthalamide), nylon 6T/6I/66, nylon 6T/6I/610 etc.; copolymers of polyhexamethylene terephthalamide (nylon 6T), polyhexamethylene isophthalamide (nylon 6I), poly(2-methylpentamethylene)terephthalamide (nylon M5T), poly(2-methylpentamethylene) isophthalamide (nylon-M5I), nylon 6T/6I, nylon 6T/M5T etc. may be proposed.
Further, the ring opening polymerization products of cyclic lactams, polycondensation products of aminocarboxylic acids, and copolymers consisting of these components, specifically aliphatic polyamide resins and the copolymers thereof such as nylon 6, poly-&ohgr;-undecanamide (nylon 11), poly-&ohgr;-dodecanamide (nylon 12) etc.; and polyamides consisting of diamines and dicarboxylic acids and the copolymers thereof, specifically nylon 6T/6, nylon 6T/11, nylon 6T/12, nylon 6T/6I/12, nylon 6T/6I/610/12 etc., and the mixtures thereof are included.
The polystyrene resin includes polymers of styrene and styrene derivatives such as &agr;-substituted styrenes and nucleus-substituted styrenes. Also, the polystyrene resin includes copolymers constituted of one or more of these monomers as a major component and one or more monomers selected from vinyl compounds such as acrylonitrile, acrylic acid and methacrylic acid and/or conjugated diene compounds such as butadiene and isoprene. Examples of the polystyrene resin include polystyrene, high-impact polystyrene (HIPS resin), acrylonitrile/butadiene/styrene copolymer (ABS resin), acrylonitrile/styrene copolymer (AS resin), styrene/methacrylate copolymer (MS resin), styrene/butadiene copolymer (SBS resin) etc. Among these, ABS resin and AS resin are preferred.
The polystyrene resin may also include styrene copolymers in which a carboxyl group-containing unsaturated compound is copolymerized as a compatibilizing component for increasing the compatibility with polyamide resins. The styrene copolymers in which a carboxyl group-containing unsaturated compound is copolymerized are copolymers obtained by polymerizing a carboxyl group-containing unsaturated compound and optionally one or more other monomers copolymerizable therewith in the presence of a rubbery polymer. Specifically, the components thereof are exemplified as follows.
1) A graft copolymer obtained by copolymerizing monomers containing an aromatic vinyl monomer as essential components, or monomers containing an aromatic vinyl monomer and a carboxyl group-containing unsaturated compound as essential components, in the presence of a rubbery polymer obtained by copolymerizing a carboxyl group-containing unsaturated compound;
2) a graft copolymer obtained by copolymerizing monomers containing an aromatic vinyl and a carboxyl group-containing unsaturated compound as essential components in the presence of a rubbery polymer;
3) a mixture of a rubber reinforced styrene resin that is not copolymerized with a carboxyl group-containing unsaturated compound and a copolymer of monomers containing a carboxyl group-containing unsaturated compound and an aromatic vinyl as essential components;
4) a mixture of the components described in the above items 1) and 2), and a copolymer of monomers containing a carboxyl group-containing unsaturated compound and an aromatic vinyl as essential components; and
5) a mixture of the components described in the above items 1), 2), 3) and 4), and a copolymer containing an aromatic vinyl as essential components
Asano Takayuki
Shimizu Kiyoshi
Daicel Chemical Industries Ltd.
Flynn ,Thiel, Boutell & Tanis, P.C.
Sanders Kriellion A.
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