JPH03131655A - Flame retardant resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition having excellent heat resistance, mechanical characteristics, water absorbing characteristics and weld characteristics and suitable in field of electric and electronic parts by blending a nylon 46 resin with a specific modified polyphenylene ether resin, halogenated flame retardant compound and flame retardant assistant at specific amounts. CONSTITUTION:The objective composition obtained by blending (A) 100 pts.wt. nylon 46 resin with (B) 5-100 pts.wt. polyphenylene ether resin modified with a compound having one or more groups in carboxylic acid group and carboxylic acid metal salt group, etc., and carbon-carbon double bond together and radical generating compound [e.g. di(2,4-dichlorobenzoyl)peroxide], (C) 2-50 pts.wt. halogenated flame retardant compound (e.g. brominated polystyrene) and (D) 1-20 pts.wt. flame retardant assistant.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a flame-retardant resin composition, and more particularly to a flame-retardant polytetra resin composition that exhibits excellent heat resistance, mechanical properties, water absorption properties, and weld properties. Regarding methylene adipamide (nylon 46) resin.

[Prior Art] Nylon 46 resins obtained from tetra-ramethylene diamine or a functional derivative thereof and ajibi acid or a functional derivative thereof are known.

This nylon 46 resin has excellent heat resistance, tensile strength,
It is considered to have great value as a useful engineering plastic because it has excellent mechanical properties such as bending strength and sliding properties.

A specific example of a field where the heat resistance of nylon 46 resin can be utilized is the electrical and electronic parts field, and flame retardancy is imparted by halogenated compounds such as brominated polystyrene and brominated polyphenylene ethyl and gold oxide. The use of such compositions in these parts is becoming widespread (Japanese Patent Application Laid-open No. 1884-61-188872.63-
51456.63-118368.63-128073
63-139942.63-161056.63-19
5907.63-195909゜63-223060.
63-317552, 64-11158, etc.).

However, although this nylon 46 resin has a higher melting point than ordinary polyamide resins such as nylon 6 resin and nylon 66 resin, this means that the molding temperature must be correspondingly high. There will be no. In other words, since the melting point of Nylon 46 resin is approximately 290°C, conditions of 300°C or higher are required for extrusion and molding, and various compounding agents added to Nylon 46 resin do not decompose even under these conditions. It is naturally desired that the performance be exhibited without causing any deterioration or deterioration. The same applies to the aforementioned halogenated compounds used for the purpose of flame retardant nylon 46 resin, and although these halogenated compounds provide excellent flame retardant properties, they do not react well when molded at high temperatures of 300°C or higher. Due to its insufficient heat resistance, it decomposes, causing a significant decrease in the mechanical strength of the nylon 46 resin, especially the strength of the weld portion. In the field of electrical and electronic components, the strength of this weld part is of great significance; for example, in connectors, etc., when a pin or the like is driven into a hole in a molded product, it causes cracks to occur around the hole in the bottle. Connectors using the aforementioned nylon 46 resin made flame-retardant with a halogenated compound have excellent heat resistance as described in JP-A-61-188872, but the strength at the weld portion is poor. The low level is an obstacle to its use.

In addition, it is known that ordinary polyamide resins such as nylon 6 and nylon 66 can be made flame retardant by using halogenated compounds such as brominated polystyrene and brominated polyphenylene ether, and the molding temperature at that time is It is lower than the temperature that causes nylon 46 resin, allowing a wider range of molding temperatures to be selected than when using nylon 46 resin alone. Furthermore, since thermal decomposition does not actually occur during the molding process, a decrease in strength at the weld portion of the molded product does not pose a problem.

[Object of the invention] The present invention was made against the background of the above-mentioned circumstances, and
The purpose is to obtain a resin composition that maintains the excellent heat resistance and mechanical properties of flame-retardant nylon 46 resin while improving its weld properties.

``Structure of the Invention: As a result of intensive research to improve the weld properties of flame-retardant nylon 46 resin, the present inventors discovered that nylon 46
The present invention has been achieved by discovering that a composition in which a resin is made flame retardant with a halogenated flame retardant compound and a flame retardant aid, and a specific amount of a specific polymer is blended into the composition satisfies the above-mentioned objectives.

That is, the resin composition of the present invention comprises (A) per 100 parts by weight of nylon 46 resin, (B) a carboxylic acid group, a carboxylic acid metal base, a carboxylic acid ester group,
5 to 100 parts by weight of a polyphenylene ether resin composed of a compound having at least one group consisting of a carboxylic acid anhydride group and an imide group and also having a carbon-carbon double bond and a radical-generating compound , (Cl
A flame retardant resin composition containing 2 to 50 parts by weight of a halogenated flame retardant compound and 1 to 20 parts by weight of a Dl flame retardant aid.

The present invention will be explained.

The main object of the (A+ acid component nylon 46 resin used in the present invention) is a polyamide obtained by a condensation reaction using adipic acid or its functional derivative as the acid component and tetramethylene diamine or its functional derivative as the amine component. , also includes those in which a part of the adipic acid component or tetramethylene diamine component is replaced with other copolymer components.

A preferred embodiment of the nylon 46 resin is disclosed in JP-A-56-149.
430 and JP-A-56-149431.

The intrinsic viscosity of the nylon 46 resin used in the present invention is m
-0.90 when measured at 35°C using cresol
~1.90, preferably in the range of 1.10 to 1.50, and when using a nylon 46 resin with an intrinsic viscosity exceeding 1.90, the fluidity of the composition in the molten state is poor (low); This is undesirable because not only does the resulting molded product lose its glossy appearance, but also the variations in its mechanical properties and thermal properties become large.

On the other hand, if the intrinsic viscosity is lower than 0.90, the mechanical strength of the composition becomes low.

The polyphenylene ether resin as the component (B) used in the present invention is a polymer represented by the following formula (1), and is obtained by condensation polymerization of the above monocyclic phenols. Copolymerization obtained by using two or more types may also be used.

For example, 2,6-dimethylphenol, 2,6-
diethylphenol, 2,6-dipropylphenol,
2-methyl-6-ethylphenol, 2-methyl-6-
Propylphenol, 2-ethyl-6-propylphenol, m-cresol, 2,3-dimethylphenol,
2.3-diethylphenol, 2.3-dipropylphenol, 2-methyl-3-ethylphenol, 2-methyl-3-propylphenol, 2-ethyl-3-methylphenol, 2-ethyl-3-propylphenol ,2
-Propyl-3-ethylphenol, 2,3.6-)-
Dimethylphenol, 2.3.6-triethylphenol, 2j,6-)dipropylphenol, 2.6-dimethyl-3-ethylphenol, 2.6-dimethyl-3-
Examples include propylphenol. Polyphenylene ethers obtained by condensation polymerization of these monocyclic phenols include poly(2,6-dimethyl-1,4-phenylene) ether, poly(26-diethyl-1,4-phenylene) ether, and poly(2,6-dimethyl-1,4-phenylene) ether. 2,6-diprobyl-1+'
i-diphenylene)ether, poly(2-methyl-6-
Ethyl-1,4-phenylene) ether, poly(2-methyl-6probyl-1,4-phenylene) ether,
Poly(2-ethyl-6-broby-1,4-phenylene)ether, 2,6-dimethylphenol/2,3.6
-Dolimethylphenol copolymer, 2,6-dimethylphenol/2.3.6-doriethylphenol copolymer, 2,6-diethylphenol/2.3.6-dolimethylphenol copolymer, 2 , 6-diprobylphenol/2.3.6-dimethylphenol copolymer, etc., but poly(26-dimethyl-1
．． 4-phenylene) ether is preferred.

The degree of polymerization of this polyphenylene ether resin is 50 or more. The compositions obtained with a degree of polymerization lower than this do not exhibit sufficient mechanical properties.

The polyphenylene ether resin of component (B) is a compound having at least one of a carboxylic acid group, a carboxylic dibase, a carboxylic ester group, a carboxylic acid anhydride group, and an imide group, and a carbon-carbon double bond. It is modified with a radical-generating compound.

Examples of the former include maleic anhydride, maleic acid, fumaric acid, maleimide, maleic hydrazide, reaction product of maleic anhydride and diamine, maleic acid amide, soybean oil, sesame oil, rapeseed oil, peanut oil, camellia oil, olive oil, Natural oils such as coconut oil, sardine oil, acrylic acid, crotonic acid, butenoic acid, vinyl acetic acid, methacrylic acid, pentenoic acid, angelic acid, cypric acid, 2-pentenoic acid, 3-
Pentenoic acid, α-ethylacrylic acid, β-methylcrotonic acid, 4-pentenoic acid, 2-hexenoic acid, 2-methyl-
2-pentenoic acid, α-ethylcrotonic acid, 2,2-dimethyl-3-butenoic acid, 2-heptenoic acid, 2-octenoic acid, 4-decenoic acid, 9-undecenoic acid, 10-undecenoic acid, 4-dodecene acid, 5-dodecenoic acid, 4-tetradecenoic acid, 9-tetradecenoic acid, 9-hexadenoic acid, 2-
Octadecenoic acid, 9-octadecenoic acid, icosenoic acid,
Tocosenoic acid, erucic acid, tetracosenoic acid, mycolipenic acid, 2.4-pentadienoic acid, 2,4-hexadienoic acid, diallylacetic acid, geranic acid, 2.4-decadienoic acid, 2.4-dodecadienoic acid, 9.12 -Hexadecadienoic acid, 9,12-octadecadienoic acid, hexadecatrienoic acid, linoleic acid, lylunic acid, octadecatrienoic acid, icosadienoic acid, icosatrienoic acid, icosatetraenoic acid, ricinoleic acid, eleo Unsaturated carboxylic acids such as stearic acid, oleic acid, icosapen citric acid, erucic acid, docosadienoic acid, docosatrienoic acid, docosatetraenoic acid, docosapentaenoic acid, tetracosenoic acid, hexacosanoic acid, hexacosenoic acid, octacosanoic acid, and traaconthenic acid. Examples include acids, their esters, acid amides, anhydrides, and the like. Moreover, these compounds may contain two or more of the above-mentioned functional groups and/or carbon-carbon double bonds, and two or more kinds of compounds may be used simultaneously.

As the latter radical generating compound or radical generating agent, known compounds used for generating radical species can be used. In this case, a sufficient half-life is required for the radical-generating compound to remain in an effective amount before the polyphenylene ether resin melts. Examples of radical-generating compounds include peroxide and the following formula (3)%
Compounds represented by the formula % can be mentioned. Examples of peroxides include di(2,4-dichlorobenzoyl) peroxide, t-butyl peroxide, di(3,5,5-trimethylhexanol) peroxide, dilauroyl peroxide, didecanoyl peroxide, Dibenzoyl peroxide 2t-butylbaroxy 2-ethylhexoate, t-butylperoxydiethyl acetate, t-butylperoxyisobutyrate, 1,1-
Di-t-butylperoxy-3,3,5-trimethylcyclohexane, t-butylperoxyisopropol carbonate, t-butylperoxy-3,3,5-trimethylhexoether 1-5t-butyl peracetate, t-butylperoxy-3,3,5-trimethylhexoether, t-butylperoxyisopropol carbonate −
Butyl perbenzoate, 4,4-di-t-butylperoxyvaleric acid butyl ester, 2,2-di-t-butylperoxybutane, dicumyl peroxide, t-
Butylcumyl peroxide, 1,3-di(t-butylbaroxyisopropyl)penzole, diisopropylbenzo-rumonohydroperoxide, cumol hydrono(-oxide, t-butylhydroperoxide, p-menthylhydroperoxide, pinane) Examples of the compound represented by the above formula (3) include hydroperoxide, 2,3-dimethyl-2,3-diphenylbutane, 3,4-dimethyl-3,4-diphenylhexane, 2. Examples include 2,3,3-tetraphenylbutane, but since the reaction starts at a relatively high temperature of 200°C or higher, the modification efficiency is high, and there is little excessive attack on the polymer, so it is difficult to crosslink and gel. 2,3-dimethyl-2,3-diphenylbutane is preferred because it does not cause chemical reaction.

A polyphenylene ether resin is combined with a compound having at least one group among a carboxylic acid group, a carboxylic acid metal base, a carboxylic ester group, a carboxylic acid anhydride group, and an imide group and also having a carbon-carbon double bond and a radical. The method of denaturation by generating compounds is the Super Mixer
Any method can be used, such as a method of uniformly mixing with a Henschel mixer etc. and kneading with nylon 46 resin, or a method of melt-kneading with an extruder etc. and pre-pelletizing, but a method of pre-pelletizing with an extruder etc. This method is effective because of the uniformity of modification of polyphenylene ether resin.

Carboxylic acid groups, carboxylic acid metal bases, carboxylic acid ester groups used for modifying polyphenylene ether resins,
The amount of the compound containing at least one group among a carboxylic acid anhydride group and an imide group and having a carbon-carbon double bond and the radical-generating compound is 100 parts by weight of the polyphenylene ether resin. 0.05 to 10 parts by weight, and 0.005 to 2 parts by weight of the latter. The former compound is preferable because when the amount is less than 0.05 parts by weight, the effect of modification is small, and when it is more than 10 parts by weight, the molecular weight of the polymer including polyphenylene ether resin and nylon 46 resin is reduced. do not have. Furthermore, when the amount of the radical-generating compound blended is less than 0.005 parts by weight, sufficient modification is not achieved, and when it exceeds 2 parts by weight, not only is the effect no longer promoted by increasing the blended amount, but also the polymer is damaged. This is not preferable because it increases the excessive reaction.

Halogenation of component (C) used in the present invention (flame retardancy)
The compound is commonly used as a flame retardant, and is blended for the purpose of making nylon 46 resin flame retardant, and the halogens are preferably bromine and chlorine. Specific examples of this halogenated compound include brominated polystyrene, brominated polyphenylene ether, brominated epoxy,
Typical examples include brominated bisphenol-A-diglycidyl ether and its oligomer, brominated polycarbonate oligomer produced from brominated bisphenol A, brominated biphenyl ether, brominated cyphthalimide compound, chlorinated hexabentadiene dimer, etc. This can be given as an example. Among these, brominated polystyrene and brominated polyphenylene ether are particularly preferred.

Brominated polystyrene is produced by polymerizing brominated styrene or by brominating polystyrene. Further, brominated polystyrene can be used even if other vinyl compounds are copolymerized therewith. Examples of the vinyl compound in this case include styrene, α-methylstyrene, and the like. Although there is no particular restriction on the degree of polymerization of this brominated polystyrene, those having a weight average molecular weight of 10,000 to 1ooo000 are preferably used.

Brominated polyphenylene ethers are also made by polymerizing brominated phenols or by brominating polyphenylene ethers. Of course, the brominated polyphenylene ether can be used even if it is copolymerized with other phenolic compounds.There is no particular restriction on the degree of polymerization of this brominated polyphenylene ether, but the weight average molecular weight is 10.
00 or more can be preferably used.

The blending amount of the halogenated compound is 100% of nylon 46 resin.
It is 2 to 50 parts by weight per part by weight. If the blending amount is less than 2 parts by weight, the flame retardant effect of the nylon 46 resin will not be sufficient;
If it exceeds 0 parts by weight, the mechanical properties and thermal properties characteristic of nylon 46 resin will be impaired, which is not preferable.

The flame retardant aid of component (D) used in the present invention is (C
It functions to enhance the flame retardancy of nylon 46 resin through a synergistic effect with one component of the halogenated compound. Examples of such compounds include compounds of metals in group Va of the periodic table and metal oxides such as boron oxide, zirconium oxide, iron oxide, and zinc oxide.In particular, compounds of metals in group Va of the periodic table include antimony. Compounds are preferred. Examples of the antimony compound include antimony trioxide, antimony pentoxide 1, sodium antimonate, and antimony trioxide is particularly preferably used. Further, these flame retardant aids may be used alone or in combination of two or more types.

The appropriate amount of these flame retardant aids to be blended is a ratio of 1 metal atom such as antimony to 2 to 5 halogen atoms in the halogenated compound (C).

Although nylon 46 resin containing these halogenated compounds and flame retardant aids exhibits excellent flame retardant properties,
The disadvantage is that the strength of the weld portion is low. but,
When the above-mentioned modified polyphenylene ether resin is further added to this, an unexpected result is obtained from the structural unit that the strength reduction in the weld part is eliminated, and in addition, the water absorption rate of the composition can be reduced. Benefits emerge. These effects make it possible to obtain a composition that can take advantage of the characteristics of nylon 46 resin in the field of electrical and electronic components.

When the unmodified polyphenylene ether resin mentioned above is blended with nylon 46 resin, the mechanical strength of the resulting composition is extremely low because the compatibility of these polymers is basically poor, and the excellent properties of nylon 46 resin are is no longer being utilized.

The amount of the modified polyphenylene ether resin blended is 5 to 100 parts by weight per 100 parts by weight of nylon 46 resin. When the amount is less than 5 parts by weight, the effect of improving the weld properties of the flame-retardant nylon 46 resin is insufficient, and when the amount is more than 100 parts by weight, the flame-retardant nylon 46 resin has an excellent effect. It is not practical because heat resistance and mechanical strength are impaired.

Pigments and other compounding agents may be added to the resin composition of the present invention in the desired amount. Such additives include fillers such as glass fibers, aramid fibers, carbon fibers, steel fibers, asbestos, ceramic fibers, fibrous materials such as potassium titanate whiskers and boron whiskers, kaolin, clay, wollastonite, and talc. ,
Examples include powdered, granular, or plate-like inorganic fillers such as mica, calcium carbonate, barium sulfate, glass peas, and glass peaks.

These fillers are usually blended as reinforcing materials, surface modifiers, or for the purpose of modifying electrical and thermal properties. It should be blended within a range that does not impair the properties and molding advantages.

In addition, for the purpose of improving heat resistance, copper compounds such as copper iodide,
Antioxidants or heat stabilizers such as hindered phenol compounds, aromatic amine compounds, organic phosphorus compounds, and sulfur compounds may also be added. Furthermore, various epoxy compounds, oxazoline compounds, etc. may be added for the purpose of improving melt viscosity stability and hydrolysis resistance. Examples of epoxy compounds include bisphenol A-type epoxy compounds obtained by reacting bisphenol-A and epichlorohydrin, aliphatic glycidyl ethers obtained by reacting various glycols or glycerol with epichlorohydrin, novolac-type epoxy compounds, and aromatic epoxy compounds. Alternatively, aliphatic carboxylic acid type epoxy compounds, alicyclic compound type epoxy compounds, etc. are preferable, and as the oxazoline compound, aromatic or aliphatic bisoxazolines, especially 2.2'-
Bis(2-oxazoline) and 2,2'-m-phenylenebis(2-oxazoline) are preferred.

It is also possible to add low stabilizers, colorants, lubricants, ultraviolet absorbers, and antistatic agents.

Furthermore, in small proportions other thermoplastic resins such as other polyamide resins, polyester resins, polyphenylene sulfide resins, polycarbonate resins, phenoxy resins, polyethylene and its copolymers, polypropylene and its copolymers, polystyrene and its copolymers, etc. Polymers, acrylic resins and acrylic copolymers, polyamide elastomers, polyester elastomers, etc.; thermosetting resins such as phenol resins, melamine resins, unsaturated polyester resins, silicone resins, etc. may be blended.

Any blending method can be used to obtain the resin composition of the present invention.

Generally, it is preferable to disperse these ingredients more uniformly, and there are methods in which all or part of them are mixed simultaneously or separately in a mixing machine such as a blender, kneader, roll, or extruder for homogenization, or in a mixing part. A method can be used in which a part of the components are mixed simultaneously or separately using, for example, a blender, kneader, roll, extruder, etc., and then the remaining components are mixed and homogenized using these mixers or extruders. Furthermore, there is a method in which a pre-triblended composition is melt-kneaded in a heated extruder, extruded into a homogenized wire shape, and then cut into a desired length to form a rod shape.

The molding composition thus dispensed is kept in a sufficiently dry state and then put into the molding machine hopper V and subjected to molding. Furthermore, it is also a recycling process to tri-blend the raw materials constituting the composition σ, directly introduce the mixture into a molding machine, and melt-knead the mixture in the molding machine.

[Examples] The present invention will be explained in detail below using Examples. In addition, various characteristics in the examples were measured by the following methods.

(1) Mechanical strength: Tensile test: Based on ASTM D638.

Condition adjustment: Conforms to JIS K7100.

(2) Weld properties: Measured using a tensile test piece in which resin flowing from both ends merges in the center.

(3) Heat distortion temperature: Based on ASTM D648. (Load: 18.6Kg/cd
>(4) Water absorption properties: Calculated from the weight increase after being left in an atmosphere of 80°C, 95% relative humidity for 8 hours. (Molded product thickness L 5mm1 (5)
Flammability: Method specified by Underwriter Laboratory, Inc. (U.S.
Evaluated by L94). (Thickness: 3.2 mm) (6) Intrinsic viscosity: Measured at 35°C using an Ostwald viscosity tube using m-cresol as a solvent.

3.8 g of polyphenylene ether resin anhydrous cuprous chloride and 54 g of di-n-butylamine.
2 fJ of a toluene solution of 55% by weight 2,6-xylenol was added to a polymerization tank containing 500 ml of a toluene solution in which 5 g of 2,6-xylenol was dissolved, and oxidative polymerization was carried out by stirring while blowing oxygen into this mixed solution kept at 30 °C. went.

Add an aqueous solution of polymerized acetic acid to deactivate the catalyst and stop the reaction. This reaction solution was concentrated and methanol was added to precipitate the polymer. Filter the precipitated polymer,
A polyphenylene ether resin was produced by washing and drying. The intrinsic viscosity was 0.49.

Modified polyphenylene ether resin■ 100 parts by weight of the above polyphenylene ether resin dried at 130°C for 5 hours, 016 parts by weight of maleic anhydride, and 0.1 part by weight of 2,3-dimethyl-2,3-diphenylbutane were mixed into screw diameters of 44 mm each. The mixture was melt-kneaded at 280°C using a vented twin-screw extruder and then pelletized.

Polyphenylene ether resin ■ 100 parts by weight of the above polyphenylene ether resin dried at 130°C for 5 hours, 0.01 part by weight of maleic anhydride, and 0.0 part by weight of 2,3-dimethyl-2,3-diphenylbutane.
01 parts by weight were melt-kneaded at 280°C using a vented twin-screw extruder with a screw diameter of 44 mm, and then pelletized.

Modified polyphenylene ether resin ■ 100 parts by weight of the above polyphenylene ether resin dried at 130°C for 5 hours, 15 parts by weight of maleic anhydride, and 0.1 part by weight of 2,3-dimethyl-2,3-diphenylbutane were added to the screw diameter. The mixture was melt-kneaded at 280° C. using a 44 mm vented twin-screw extruder, and then pelletized.

Examples 1-2. Comparative Examples 1 to 3 Nylon 46 resin with an intrinsic viscosity of 1.42 (rSTANY
LJ (manufactured by DSM in the Netherlands), unmodified or modified polyphenylene ether resin ■ or ■, brominated polystyrene (Pyrocheck 68-PB)
1 shown in Table 1.
After uniformly mixing in a tumbler in advance, the mixture was melt-kneaded using a vented twin-screw extruder with screw diameters of 44 mm under vacuum at a cylinder temperature of 320°C, a screw rotation speed of 150 rpm, and a discharge rate of 40 kg/h. Then, the thread discharged from the die is cooled and cut to obtain a pellet for forming. However, modified polyphenylene ether resin (1) had poor operability during extrusion, and good pellets of modified polyphenylene ether resin could not be obtained.

Next, using this pellet, the cylinder temperature was 300°C, the mold temperature was 120°C, and an injection molding machine with an injection capacity of 5 ounces was used.
Molded articles for each characteristic measurement were molded under the conditions of an injection pressure of 800 Kg/-5, a cooling time of 15 seconds, and a total molding cycle of 40 seconds.

Each characteristic was measured using these molded products. The molded product was conditioned for 88 hours in an atmosphere of 23° C. and 50% relative humidity in accordance with JIS K7100 before measurement.

The results of each measurement are shown in Table-1. When using nylon 46 resin alone, there is no particular difference in strength at the weld area compared to other areas (comparative example 1), but when using nylon 46 resin made flame retardant with brominated polystyrene and antimony trioxide, the strength at the weld area is The strength reduction was very large (Comparative Example 2). However, when a modified polyphenylene ether resin is blended, the strength of the weld part increases while maintaining the heat distortion temperature of the flame-retardant nylon 46 resin, and the water absorption rate of the composition can also be lowered. 1,
2). If the blended amount of the modified polyphenylene ether resin is small, the strength improvement effect of this weld part will not be sufficient (Comparative Example 3), and if the polyphenylene ether resin is not modified or the amount of modification is insufficient, The mechanical properties, ie, tensile elongation, of the composition blended with nylon 46 resin are low, and the excellent properties of nylon 46 resin are impaired (Comparative Examples 4 and 5).

Example 3. Comparative Example 6 Nylon 46 resin ('5TANYL) with an intrinsic viscosity of 1.42 was dried at 110° C. for 12 hours under reduced pressure of 10 Torr.
J manufactured by DSM, Netherlands), modified polyphenylene ether resin ■ modified by the above method, brominated polyphenylene ether (r PO-64PJ manufactured by Greitreik)
and antimony trioxide (“Pato Nkusu C” Japanese concentrate)
Co., Ltd.) in the proportions shown in Table 1 in advance in a tumbler, and then evacuated using a vented twin-screw extruder with screw diameters of 44 mm at a cylinder temperature of 3.
20℃, screw rotation speed 15Orpm, discharge! 40K
The thread was melt-kneaded at a rate of 1-g/h and discharged from a die (1-g/h), and the thread was cooled and cut to form pellets for molding.

The pellets were then used in an injection molding machine with an injection capacity of 5 ounces, at a cylinder temperature of 300°C and a mold temperature of 120°C.
1 injection pressure 800 Kg/co? Molded articles for each characteristic measurement were molded under the following conditions: cooling time 15 seconds, and total molding cycle 40 seconds.

Each characteristic was measured using these molded products. Note that the molded product was conditioned for 88 hours in an atmosphere of 23° C. and 50% relative humidity in accordance with JIS K7100 before measurement.

The results of each measurement are shown in Table-1. Brominated Boristi 1,z
Similar to the case of using : and ', the effect of improving the weld properties by blending the modified polyphenylene ether resin was observed (Example 3, Comparative Example 6).

Comparative Examples 7 to 8 Nylon 66 resin ("Leona 1300S J" manufactured by Asahi Kasei Kogyo Ltd.) or nylon 6 resin (manufactured by Teijin Ltd.) and brominated polystyrene ("(" Pyrocheck 68-PB J Nissan Ferro Organic Chemicals (manufactured by 11 companies) and antimony trioxide (
"Patox C" (manufactured by Nippon Seiko Co., Ltd.) was mixed uniformly in advance in a tumbler in the proportions shown in Table 1, and then a cylinder was evacuated using a vented twin-screw extruder with a screw diameter of 44 mm. The temperature is 28 when using nylon 66 resin.
0'C, nylon 6 resin was melted and kneaded at 250°C, screw rotation speed 150 rpm, and discharge rate 140 kg/'h, and the thread discharged from the die was cooled and cut to obtain molding pellets.

Next, the pellets were used in an injection molding machine with an injection capacity of 5 ounces, and the cylinder temperature was adjusted to 28°C for nylon 66 resin.
0℃, 250℃ for nylon 6 resin, mold temperature 80℃
, injection pressure 800 Kg/co! , cooling time 18 seconds,
Molded articles for each characteristic measurement were molded under conditions of a total molding cycle of 45 seconds.

Each characteristic was measured using these molded products. Note that the molded product was conditioned for 88 hours in an atmosphere of 23° C. and 50% relative humidity in accordance with JIS K7100 before measurement.

The results of each measurement are shown in Table-1. Since the molding temperature for nylon 66 resin and nylon 6 resin is lower than that for nylon 46 resin, the decrease in mechanical strength of the welded part of the molded product due to flame retardation is not actually a bad thing (
Comparative example 7゜8).

Claims (1)

[Scope of Claims] 1. (A) per 100 parts by weight of nylon 46 resin (B) at least a group consisting of a carboxylic acid group, a carboxylic acid metal base, a carboxylic acid ester group, a carboxylic acid anhydride group, and an imide group; 5 to 100 parts by weight of a polyphenylene ether resin modified with a compound having one group and a carbon-carbon double bond and a radical-generating compound, (C) 2 to 50 parts by weight of a halogenated flame retardant compound ,(D)
A flame retardant resin composition comprising 1 to 20 parts by weight of a flame retardant aid. 2. The flame-retardant resin composition according to claim 1, wherein the halogenated flame-retardant compound as component (C) is brominated polystyrene. 3. The flame-retardant resin composition according to claim 1, wherein the halogenated flame-retardant compound as component (C) is a brominated polyphenylene ether.