JPH0841302A - Flame-retardant polybutylene terephthalate resin composition - Google Patents

Abstract

PURPOSE:To prepare a resin compsn. which can provide a molding having excellent flame retardancy, melt processing stability, mechanical properties and other properties by incorporating a PBT resin, a thermoplastic resin having an ester bond other than the PBT resin, an org. halogenated hydrocarbon flame retardant, antimony tetraoxide, and a metal deactivator. CONSTITUTION:A resin compsn. comprising a polybutylene terephthalate-(PBT) resin, a thermoplastic resin having an ester bond other than the PBT resin, an org. halogenated hydrocarbon flame retardant, antimony tetraoxide, and a metal deactivator. This resin composition can provide moldings which are free from surface roughening, have good appearances and excel lent mechanical properties, heat resistance and other properties, and, by virtue of the incorporation of an org. halogenated hydrocarbon flame retardant and a flame retarding assistant, have very good flame retardancy. Therefore, it can be effectively used in applications including electrical components and electronic components and, in addition, automobile parts, mechanical parts, daily necessaries, and other wide variety of applicatrons where flame retarancy is strongly required in addition to various properties such as dimensional accuracy mechanical properties and heat resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant polybutylene terephthalate resin composition, a method for producing the composition, and a molded article made of the resin composition. Specifically, a polybutylene terephthalate-based resin composition capable of providing a molded article having excellent properties such as flame retardancy, thermal stability during melt processing, mechanical properties, heat resistance, and dimensional stability, and the production thereof. The present invention relates to a method and a molded article obtained from the composition, wherein the molded article of the present invention utilizes the above-mentioned characteristics,
It can be effectively used for electric / electronic parts, automobile parts, machine parts, office supplies, daily necessities, and a wide range of other applications.

[0002]

2. Description of the Related Art Polybutylene terephthalate resin, which is a type of polyester resin, has excellent moldability and electrical properties, heat resistance, solvent resistance, mechanical properties, etc. The amount of use and the usage are expanding year by year. With the expansion of applications etc., the use environment of molded articles made of polybutylene terephthalate resin has also diversified, and there is a demand for those with better characteristics that can withstand more severe conditions, Particularly, thermal stability, heat resistance, moldability, dimensional stability, flame retardancy, mechanical properties such as tensile strength and impact resistance, and characteristics such as appearance have become important requirements during melt molding.

Thermoplastic polyester resins are inherently flammable, and once ignited, they gradually burn without extinguishing the fire even if the fire source is removed. Such flammability is a serious problem in view of safety against fire, especially in electric parts and electronic parts, and polybutylene terephthalate resin, which is a kind of thermoplastic polyester resin, is no exception. However, since the polybutylene terephthalate resin can be easily made flame-retardant by adding a flame retardant, the polybutylene terephthalate resin contains an organic halogen-based flame retardant and an antimony compound-based flame retardant auxiliary agent for flame retardance. It has been conventionally proposed to prepare a polybutylene terephthalate resin composition (JP-A-49)
No. 14563, JP-A No. 50-86550,
JP-A-51-73555). And, in such prior art, antimony trioxide is generally used as an antimony compound-based flame retardant aid, and polybutylene terephthalate-based resin compositions containing these flame retardants obtained in the prior art are used for electric / electronic parts and automobiles. It is used for parts and machine parts.

Further, since thermoplastic polyester resins such as polybutylene terephthalate resins are crystalline, they are likely to be deformed by shrinkage during molding or annealing, and molded products requiring dimensional accuracy, such as substrates and cases. It becomes a problem when it is used as a molding material for a molded product such as. Therefore, for the purpose of improving the dimensional stability of thermoplastic polyester-based resins such as polybutylene terephthalate-based resins, for example, JP-A-2-54382 discloses a polyester-based resin such as polybutylene terephthalate-based resin and a polycarbonate. A method of melt-mixing a resin and using it has been proposed. However, when a polyester resin having an ester bond and a polycarbonate resin are kneaded in a molten state, an ester exchange reaction occurs between the two resins, and the crystallization rate and crystallinity of the thermoplastic polyester resin are significantly reduced. In many cases, the excellent physical properties inherent in the resin are significantly impaired.
In particular, for a mixture of a thermoplastic polyester-based resin and a polycarbonate resin, the above-mentioned organic halogen-based flame retardant and antimony trioxide flame-retardant auxiliary that have been generally used for flame retarding the thermoplastic polyester-based resin are used. When the agent is blended, the transesterification reaction between the two resins is further promoted and the releasability at the time of molding such as injection molding is deteriorated.
The surface roughness of molded products and the decrease in heat resistance become remarkable.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems and to provide excellent thermal stability and flame retardancy during melting, and also excellent dimensional accuracy, mechanical properties and moldability. Then, it is to provide a flame-retardant polybutylene terephthalate resin composition which can be effectively used for a wide range of applications including electric / electronic parts, automobile parts, machine parts, office supplies and the like. Then, the present invention is to provide a method for producing a polybutylene terephthalate resin composition having such excellent properties, and a molded article comprising the composition.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to achieve the above object, and found that a resin composition containing a polybutylene terephthalate resin and another thermoplastic resin having an ester bond was used. When the organic halogen-based flame retardant and the antimony compound-based flame retardant aid are contained, antimony tetroxide is used as the flame retardant aid, and when a metal deactivator is further included, polybutylene terephthalate resin and ester are added. A flame-retardant polybutylene terephthalate system that effectively suppresses transesterification reaction with other thermoplastic resin having a bond, has good thermal stability during melting, and has excellent heat resistance and moldability. A resin composition can be obtained, and a molding shrinkage rate is small and dimensional accuracy is high from such a flame-retardant polybutylene terephthalate resin composition. It was found that the molded article can be obtained.

Further, the inventors of the present invention have described the above-mentioned flame retardancy containing a polybutylene terephthalate resin, another thermoplastic resin having an ester bond, an organic halogen flame retardant, antimony tetroxide and a metal deactivator. In producing a polybutylene terephthalate-based resin composition, it was found that when these components are melt-mixed in a specific order, a composition having more excellent thermal stability during melting can be obtained. Moreover, when the present inventors adopted such a specific melting / mixing method, the same thermal stability at the time of melting was obtained even when an antimony compound other than antimony tetroxide was used as a flame retardant aid. It was found that a flame-retardant polybutylene terephthalate-based resin composition having excellent properties was obtained, and the present invention was completed based on these findings.

Therefore, the present invention provides a polybutylene terephthalate resin (A); a thermoplastic resin (B) having an ester bond other than the polybutylene terephthalate resin; an organic halogen flame retardant (C); antimony tetroxide (D). ); And a metal deactivator (E) are contained in the polybutylene terephthalate-based resin composition.

The present invention further comprises a polybutylene terephthalate resin (A); a thermoplastic resin (B) having an ester bond other than the polybutylene terephthalate resin; an organic halogen flame retardant (C); an antimony compound (D '). ); And a metal deactivator (E), which is a method for producing a polybutylene terephthalate resin composition, wherein the antimony compound (D ′) and the metal deactivator (A) are added to the polybutylene terephthalate resin (A). E) is melt mixed to form a mixture, and then the mixture obtained above, the thermoplastic resin (B) having an ester bond other than the polybutylene terephthalate resin, and the organic halogen flame retardant (C) are melt mixed. And a method for producing a polybutylene terephthalate resin composition, and a polybutylene produced by this method. A terephthalate-based resin composition. The present invention also includes a molded product made of the above polybutylene terephthalate resin composition.

The polybutylene terephthalate resin (hereinafter sometimes referred to as "PBT resin") used as the component (A) in the polybutylene terephthalate resin composition (hereinafter referred to as "PBT resin composition") of the present invention is P
At least 70 mol% of the acid component constituting the BT resin is terephthalic acid or its ester-forming derivative, and at least 70 mol% of the diol component is 1,4
A polyester resin consisting of butanediol, 3
Within the range of 0 mol% or less, other copolymerized acid components and /
Alternatively, another copolymerized diol component may be used. At that time, when an ester-forming derivative of terephthalic acid is used as an acid component, a dialkyl ester, a diaryl ester of terephthalic acid or the like can be used.

Examples of other copolymerizable acid components that can be used in the range of 30 mol% or less include aromatic dicarboxylic acids such as isophthalic acid, diphenyldicarboxylic acid and naphthalene-1,4-dicarboxylic acid; adipic acid, Sebacic acid,
Aliphatic dicarboxylic acids such as azelaic acid, succinic acid, and oxalic acid; oxycarboxylic acids such as β-oxyethoxybenzoic acid and p-oxybenzoic acid; or ester-forming derivatives thereof, and the like. The polymerized acid component may be used alone or in combination of two or more.

Further, examples of the copolymerization diol component which can be used in the range of 30 mol% or less include ethylene glycol, propylene glycol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5.
-Pentanediol, 1,6-hexanediol, 1,
Aliphatic diols having 2 to 10 carbon atoms such as 9-nonanediol, 2-methyl-1,8-octanediol and decamethylenediol; alicyclic diols such as cyclohexanediol; aromatic diols such as bisphenol A and bisphenol S Polyalkylene glycols such as polyethylene glycol, polytrimethylene glycol, polytetramethylene glycol, etc. may be mentioned, and these copolymerized diol components may be used alone or 2
More than one species may be used.

The method for producing the PBT-based resin is not particularly limited, and it is conventional to use the above-mentioned acid component mainly consisting of terephthalic acid or its ester-forming derivative and the above-mentioned diol component mainly consisting of 1,4-butanediol. Either a known method for producing an aromatic polyester by a transesterification reaction or a method by a direct esterification reaction can be used.

In the present invention, the intrinsic viscosity of the PBT resin is 0.7 to 1. When measured at 30 ° C. using a phenol / tetrachloroethane (1: 1 weight ratio) mixed solvent.
It is preferable to use one in the range of 3 dl / g,
A PBT resin in the range of 0.7 to 1 dl / g is more preferable. When a PBT-based resin having an intrinsic viscosity of less than 0.7 dl / g is used, the toughness of a molded article obtained from the polyester-based resin composition tends to be insufficient, while the intrinsic viscosity is 1.3 dl / g.
If the PBT-based resin in excess of g is used, the melt viscosity at the time of molding becomes too high and the moldability decreases, and molding tends to be difficult, especially in the case of injection molding.

Further, a thermoplastic resin having an ester bond other than the polybutylene terephthalate resin used as the component (B) in the present invention (hereinafter referred to as "other ester bond-containing thermoplastic resin") is contained. Examples of other ester bond-containing thermoplastic resins include thermoplastic polyester resins and polycarbonate resins other than PBT-based resins, and other ester bond-containing thermoplastic resins may be used alone, or You may use together 1 or more types. When two or more other ester bond-containing thermoplastic resins are used, even if two or more different thermoplastic polyester resins are used in combination, one kind or two or more kinds of thermoplastic polyester resins and one kind are used. Alternatively, two or more polycarbonate resins may be used in combination, or
You may use it in combination of different polycarbonate resin of 1 or more types. Among them, other ester bond-containing thermoplastic resins to be used with the PBT resin include
Polycarbonate resin and polyethylene terephthalate resin are preferable, and when these resins are used, effects such as improvement of dimensional stability and surface gloss can be obtained.

When a thermoplastic polyester resin other than PBT resin is used as the other ester bond-containing thermoplastic resin, for example, aliphatic dicarboxylic acids such as sebacic acid and adipic acid; isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, etc. Aromatic dicarboxylic acids; alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid or their ester-forming derivatives, and hydroxyl groups such as ethylene glycol, propylene glycol, butylene glycol, hexanediol, cyclohexanedimethanol, polytetramethylene glycol, bisphenol A It is possible to use a thermoplastic polyester obtained by a polycondensation reaction with a compound having two. More specific examples include polyethylene terephthalate, polypropylene terephthalate, polyethylene naphthalate, polycyclohexane dimethyl terephthalate, and copolymers thereof.

When a polycarbonate resin is used as the other ester bond-containing thermoplastic resin, a known non-halogenated polycarbonate resin obtained by reacting carbonic acid or a derivative thereof with a glycol or a dihydric phenol compound is used. Any of them can be used, and the production method of the polycarbonate resin is not particularly limited. Among them, a bisphenol-type polycarbonate resin obtained by reacting one or more bisphenol-based compounds such as bisphenol A or a nuclear alkylated derivative thereof with a carbonic acid ester or phosgene has good moldability and mechanical properties of molded articles. It is preferable in terms of low warpage and heat resistance. However, it is of course possible to use a polycarbonate resin having a branch in which a part of the bisphenol compound is replaced with a trifunctional or higher polyfunctional phenol such as a triphenol compound.

In the PBT resin composition of the present invention, a halogenated polycarbonate resin is preferably used as a kind of the organic halogen flame retardant which is the component (C), as described below. When a polycarbonate resin is used as the plastic resin, a non-halogenated polycarbonate resin is generally used. In this respect, the polycarbonate resin used as the other ester bond-containing thermoplastic resin is (C) component (organic halogen-based flame retardant). It is distinguished from the halogenated polycarbonate resin used as one of the above.

In the PBT resin composition of the present invention, [PB
The ratio of [T-based resin]: [other thermoplastic resin containing ester bond] by weight is preferably 95: 5 to 50:50, and more preferably 90:10 to 60:40.
The proportion of the other ester bond-containing thermoplastic resin is less than 5% by weight (the proportion of the PBT resin is more than 95% by weight) based on the total weight of the PBT resin and the other ester bond-containing thermoplastic resin. And the dimensional accuracy and surface gloss of the molded product are likely to decrease, while other ester bond-containing thermoplastic resins are more than 50% by weight (PBT-based resin is 50% by weight).
If it is less than 10% by weight), the solidification rate decreases and the molding cycle tends to be delayed.

The PBT resin composition of the present invention is
In addition to the above PBT-based resin and other ester bond-containing thermoplastic resin, an organic halogen-based flame retardant is further contained as the component (C). As the organic halogen-based flame retardant, any of known low molecular weight organic compounds and high molecular weight organic compounds having a halogen atom in the molecule, which are known to have a flame retardant effect, can be used, and among them, halogen is An organic halogen flame retardant which is bromine is preferably used. Further, in the organic halogen-based flame retardant, the halogen content in the molecule is preferably 20% by weight or more. When the halogen content in the molecule is less than 20% by weight, the flame retarding effect becomes small, and it becomes necessary to add a large amount of flame retardant, and accordingly, the necessary amount of the flame retardant aid also increases. The mechanical properties of the molded product are likely to deteriorate.

Specific examples of the organic halogen flame retardant include:
Halogenated polycarbonate (for example, tetrabromobisphenol A carbonate oligomer), halogenated acrylic resin, halogenated epoxy resin, halogenated phenoxy resin, halogenated polystyrene, tetrabromobisphenol A / ethyl ether oligomer, halogenated polyphenylene ether (for example, poly High molecular weight organic halogen compounds such as dibromophenylene oxide; decabromodiphenyl ether, hexabromophenol, tetrabromobisphenol A, epoxidized tetrabromobisphenol A, tetrabromobisphenol A.bis (2,3-dibromopropyl ether), tetra Bromobisphenol A.bis (allyl ether), tetrabromobisphenol A.2-hydroxyethyl ether Brominated bisphenol A, hexabromobenzene, tetrabromophthalic anhydride, tribromophenol, bis (tribromophenoxy) ethane, bis (pentabromophenoxy) ethane, ethylenebistetrabromophthalimide, brominated styrene, tetrabromobisphenol S, Examples thereof include low molecular weight organic halogen compounds such as bis (2,3-dibromopropyl ether) of tetrabromobisphenol S. These organic halogen flame retardants may be used alone or in combination of two or more. Good. Among the above organic halogen-based flame retardants, high molecular weight organic halogen compounds such as halogenated polycarbonate, halogenated phenoxy resin, halogenated polystyrene, and halogenated acrylic resin are preferable from the viewpoint of flame retarding effect and safety.

The content of the organic halogen-based flame retardant is PBT.
Total of 10 series resins and other ester bond-containing thermoplastic resins
It is preferably 10 to 40 parts by weight, more preferably 15 to 30 parts by weight, based on 0 parts by weight. If the content of the organic halogen-based flame retardant is less than 10 parts by weight, P
The flame retardancy of the BT resin composition and the molded product obtained from the BT-based resin composition tends to be insufficient, while when it is more than 40 parts by weight, the mechanical properties of the molded product are likely to deteriorate.

The PBT resin composition of the present invention contains antimony tetroxide as the component (D). Antimony tetroxide functions as a flame retardant aid, and by using an antimony tetroxide flame retardant aid in combination with an organic halogen flame retardant, it is possible to achieve even better flame retardancy of the PBT resin composition. The content of antimony tetroxide is PB
Total 1 of T-based resin and other ester bond-containing thermoplastic resin
It is preferably from 3 to 15 parts by weight, more preferably from 6 to 12 parts by weight, based on 00 parts by weight. If the content of antimony tetraoxide is less than 3 parts by weight, it becomes difficult to obtain a sufficient flame retardant effect, while if it is more than 15 parts by weight, PBT
Deterioration of mechanical properties of a molded product obtained from the resin composition,
It is not preferable because heat resistance is deteriorated.

When antimony tetroxide is used as a flame retardant aid in the PBT resin composition of the present invention, PBT is used.
Method of adding antimony tetroxide into a resin composition, that is, component (A) when producing a PBT resin composition
The method of melt-mixing the component (E) is not particularly limited, and any method may be used. For example, (i) a method of melt-mixing all components at the same time, (ii) any of the components (A) to (E)
, (3) or (4) are melt-mixed in advance, and then the remaining components are added and melt-mixed.
It is possible to employ a method in which the component (E) is sequentially added in an arbitrary order and melt-mixed. When antimony tetroxide is used as the flame retardant aid, regardless of the melt-mixing method of each component in the production of the PBT resin composition, the flame-retardant excellent in thermal stability during melting is obtained. A PBT resin composition can be obtained. And even then, PBT
First, antimony tetroxide and a metal deactivator [(E) component] are added to the system resin and melt-mixed. Then, other ester bond-containing thermoplastic resin and organic halogen-based flame retardant are added to the mixture obtained there. When the method of adding and melt-mixing is adopted, it is possible to obtain a flame-retardant PBT-based resin composition having further excellent thermal stability during melting.

In the present invention, the flame retardant aid and the metal deactivator [(E) component] are first added to the PBT resin and melt-mixed, and then the resulting mixture contains another ester bond. When a PBT-based resin composition is manufactured by adopting the above-described specific method of adding a thermoplastic resin and an organic halogen-based flame retardant and performing melt mixing, not only antimony tetraoxide but also antimony tetraoxide other than Even when an antimony compound is used as a flame retardant aid, it is possible to obtain a flame-retardant PBT-based resin composition having excellent thermal stability when melted. Therefore, the present invention provides a method for producing a PBT-based resin composition by such a method, and The PBT resin composition thus obtained is included. And, as an example of the antimony compound that can be used when the PBT-based resin composition of the present invention is manufactured by adopting such a specific melt-mixing method, antimony trioxide, antimony tetroxide, antimony pentoxide, etc. are exemplified. Examples thereof include antimony oxides and antimonates such as sodium antimonate. In this case, the amount of the antimony compound used is preferably 3 to 15 parts by weight, more preferably 6 to 12 parts by weight, based on 100 parts by weight of the total of the PBT resin and the other ester bond-containing thermoplastic resin. . When the amount of the antimony compound used is less than 3 parts by weight, it becomes difficult to obtain a sufficient flame retardant effect, while when it is more than 15 parts by weight, the mechanical properties of the molded article obtained from the PBT resin composition deteriorate. It is not preferable because heat resistance is deteriorated.

Further, the PBT resin composition of the present invention contains a metal deactivator as the component (E). By including a metal deactivator in the PBT-based resin composition, the transesterification reaction between the PBT-based resin and the other ester bond-containing thermoplastic resin can be effectively suppressed, and the melt stability can be improved. You can measure. As the metal deactivator, it is preferable to use a metal compound having a function of deactivating the polycondensation catalyst contained in the PBT resin composition and the transesterification catalyst function of the antimony compound. Compounded drug latest version ”110th
Various metal compounds described on page 111 (March 30, 1989) (published by Rubber Digest Co.) can be used.

Specific examples of the metal deactivator which can be used in the present invention include alkyl acid phosphate compounds, oxalic acid amide compounds and hydrazide compounds. In that case, the alkyl acid phosphate compound has a general formula; O = P (OH) _n (OR) _3-n [wherein R is
Is an alkyl group (preferably an alkyl group having 8 to 30 carbon atoms), n is 1 or 2], and specific examples of the alkyl group include octyl, 2-ethylhexyl, isooctyl, nonyl, isononyl, decyl and isodecyl. , Dodecyl, isododecyl, tetradecyl, hexadecyl, octadecyl, eicosyl and the like. The alkyl acid phosphate compound is generally a monoalkyl acid phosphate (n in the general formula above) during synthesis.
= 1 compound) and dialkyl acid phosphate (n = 2 compound in the above general formula), but in the present invention, these mixtures can be used as they are, and in some cases, each compound may be used as a single compound. Separated items may be used.

Specific examples of the above-mentioned oxalic acid amide compound include oxalic acid bisbenzylidene hydrazide,
Examples thereof include N, N'-bis [2- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionyloxyl] ethyl] oxamide. Further, specific examples of the hydrazide compound include decanedicarboxylic acid disalicyloyl hydrazide and N, N′-bis [3-
(3,5-di-t-butyl-4-hydroxyphenyl)
Examples thereof include propionyl] hydrazine and bis [2-phenoxypropionylhydrazide] isophthalate. The above metal deactivators may be used alone or in combination of two or more.

The content of the metal deactivator in the PBT resin composition of the present invention is 0. 0 based on 100 parts by weight of the PBT resin and other ester bond-containing thermoplastic resin.
It is preferably from 01 to 5 parts by weight, more preferably from 0.1 to 3 parts by weight. When the content of the metal deactivator is less than 0.01 part by weight, it becomes difficult to effectively suppress the transesterification reaction between the PBT resin and the other ester bond-containing thermoplastic resin, and the PBT resin composition When the content of the metal deactivator is more than 5 parts by weight, the effect of suppressing the transesterification reaction is not further improved, and conversely, the hydrolysis resistance is decreased. Problems such as heat coloring during melting tend to occur. Further, the PBT-based resin composition of the present invention, together with the flame-retardant auxiliary agent composed of the above-mentioned antimony tetroxide and other antimony compounds, may optionally contain other flame-retardant auxiliary agents such as boron oxide, zirconium oxide and iron oxide. You may use a drug together.

The PBT resin composition of the present invention may contain various conventionally known inorganic fillers and organic fillers, if desired. Examples of such fillers are surface-treated or Not applied, glass fiber, carbon fiber, aluminum fiber, stainless fiber, metal fiber such as brass fiber, silicon nitride whiskers, aluminum silicate whiskers, fibrous inorganic compounds such as magnesium silicate whiskers, glass flakes, mica, talc, Examples thereof include inorganic fillers such as kaolin, wollastonite, calcium carbonate and potassium titanate, organic fillers such as aramid fibers and powdery epoxy compounds, and these may be used alone or in combination of two or more. it can. Among them, glass fiber is particularly preferably used, and when glass fiber is used, a molded product having more excellent mechanical properties as well as properties such as thermal stability at the time of heating and melting can be obtained. Furthermore, the PBT-based resin composition of the present invention may further contain various conventionally known additives such as an ultraviolet absorber, a lubricant, a release agent, an antistatic agent, an antioxidant, a crystal nucleating agent, a dye, if necessary. Colorants such as pigments, plasticizers, heat stabilizers, and thermoplastic elastomers can be contained.

In the present invention, when antimony tetroxide is used as the flame retardant aid, the method for producing the PBT resin composition is not particularly limited as described above, and it is conventionally used for producing the polyester resin composition. Although any of the known methods described above can be adopted, as an example of a specific manufacturing method,
(1) A PBT resin, another ester bond-containing thermoplastic resin, an organic halogen flame retardant, antimony tetroxide, a metal deactivator and, if necessary, other additives in advance, such as a tumbler or a Henschel mixer. (2) PBT-based resin, other method in which the mixture is uniformly mixed by using, and is supplied to a single-screw or twin-screw extruder, melt-kneaded, extruded, and cut into pellets by an appropriate size. Ester bond containing thermoplastic resin, organic halogen flame retardant, antimony tetroxide,
The metal deactivator and, if necessary, any other two, three, or four of the other additives are melt-kneaded and extruded in advance with an extruder or the like to produce pellets, and the remaining pellets are then added to the pellets. A method of producing pellets by adding the components, melt-kneading the mixture using an extruder or the like, and extruding the mixture can be used.

Among them, PBT resin is mixed with antimony tetroxide and a metal deactivator and melt-kneaded by using an extruder or the like to form pellets, and the remaining ester bond-containing thermoplastic resin and A method for producing a PBT-based resin composition of the present invention by adding an organic halogen-based flame retardant and melt-kneading with an extruder or the like to produce a pellet or the like, that is, a specific method of the above-mentioned method (2) If adopted, P that is more excellent in thermal stability during heating and melting
A BT resin composition can be obtained.

In the present invention, when an antimony compound other than antimony tetraoxide, such as antimony trioxide, is used as the flame retardant aid, as described above, PB is used.
An antimony compound and a metal deactivator are added to a T-based resin, and the mixture is melt-mixed (melt-kneaded) using an extruder or the like to form pellets or other mixtures, and this mixture is mixed with other ester bond-containing thermoplastic resin and Adopting a method of producing a PBT-based resin composition in the form of pellets or other forms by adding an organic halogen-based flame retardant and further melt-mixing (melt-kneading) with an extruder or the like can improve the thermal stability during melting. Excellent P
It is necessary to obtain a BT resin composition.

In any of the above cases, the temperature at the time of melt mixing (melt kneading), the residence time in the molten state, etc. are not particularly limited, but generally they exist at a temperature of 230 to 270 ° C. and in the molten state. Melt mixing (melt kneading) is performed under conditions such that the time is 20 to 90 seconds to suppress the transesterification reaction between the PBT-based resin and the other ester bond-containing thermoplastic resin, and heat coloring during heating and melting. It is preferable in terms of suppression.

The PBT resin composition of the present invention containing a PBT resin, another ester bond-containing thermoplastic resin, an organic halogen flame retardant, antimony tetroxide and a metal deactivator, and the above specific mixing method. PBT-based resin composition of the present invention containing a PBT-based resin, other ester bond-containing thermoplastic resin, organic halogen-based flame retardant, antimony compound other than antimony tetroxide, and metal deactivator Are both PB during heating and melting.
The transesterification reaction between the T-based resin and the other thermoplastic resin having an ester bond is suppressed, the stability during melt processing is improved, the moldability and the releasability are excellent, and the molded product obtained therefrom is obtained. Has a good appearance without surface roughness, has excellent physical properties such as dimensional stability, mechanical properties, heat resistance, etc., and is extremely excellent in flame resistance due to the inclusion of organic halogen-based flame retardants and flame retardant aids. Since it is flammable, it can be effectively used in applications such as electric parts and electronic parts, which are strongly required to have flame retardancy as well as characteristics such as dimensional stability, mechanical properties, and heat resistance.

The PBT resin composition of the present invention can be molded by using a molding method and a molding apparatus generally used for polyester resins. For example, it can be molded by any molding method such as injection molding, extrusion molding, press molding, blow molding, calender molding, etc., whereby electric parts, electronic parts, mechanical parts, automobile parts, pipes, sheets, films, It is possible to manufacture molded products of any shape and application such as household goods, and especially electric parts, electronic parts, mechanical parts, by injection molding, etc.
Suitable for manufacturing automobile parts, office supplies, daily necessities and other molded products. The melt-kneading temperature at the time of molding and the residence time in the molding machine are not particularly limited, but generally 230 to 2
It is PB to carry out melt-kneading at a temperature of 70 ° C. and perform molding under the condition that the time existing in a molten state is 20 to 90 seconds.
It is preferable from the viewpoints of suppressing the transesterification reaction between the T-based resin and the other ester bond-containing thermoplastic resin, and maintaining the whiteness and hue of the molded product.

[0037]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. In the following Examples and Comparative Examples, the thermal stability (transesterification resistance) of the PBT-based resin composition during melting, the tensile strength, the tensile elongation and the molding shrinkage rate of the molded article obtained from the PBT-based resin composition. Was evaluated or measured as follows. Further, in the following Examples and Comparative Examples, unless otherwise specified, parts represent parts by weight, and% represents% by weight.

[Evaluation of thermal stability (transesterification resistance) of the PBT-based resin composition during melting] The PBT-based resin composition was retained in a cylinder of an injection molding machine for a predetermined period of time to be deteriorated, and then a mold was used. The heat distortion temperature of the test piece obtained by injecting into the test piece was measured, and the differential scanning calorimetry (DSC) was applied to the PBT resin composition of each Example and Comparative Example to derive the crystallinity of the polyester. By measuring the melting point and the crystallization peak temperature, the thermal stability (transesterification resistance) of the PBT resin composition during melting was evaluated.

(1) Measurement of heat distortion temperature of a test piece after retention deterioration in a cylinder of an injection molding machine: Using the pellets of the PBT resin composition of each Example or Comparative Example as a molding material, NISSEI PLASTIC INDUSTRIAL CO., LTD. Using an 80 ton injection molding machine manufactured by Co., Ltd.
After being retained for 0 minute to be thermally deteriorated, injection-molded in a mold at a temperature of 70 ° C. to prepare a test piece with dimensions of 120 × 12 × 6 mm, and subjected to a deflection temperature under load test according to JIS K7207 to perform a test piece. Was measured to determine the heat deformation temperature of the test piece after the retention deterioration in the cylinder of the injection molding machine.

(2) Measurement of melting point and crystallization peak temperature by DSC: PBT-based resin composition pellets of each Example or Comparative Example were heated from room temperature to 28 at a temperature rising rate of 20 ° C./min.
After raising the temperature to 0 ° C. and holding at 280 ° C. for 10 minutes,
The temperature is decreased to room temperature at a temperature decrease rate of ℃ / min, the temperature is increased from room temperature to 280 ° C. at a temperature increase rate of 20 ° C./minute again, and the melting point peak temperature (Tm ₁ ) at the _first temperature increase, The crystallization temperature peak temperature (Tcc) and the melting point peak temperature (Tm ₂ ) at the time of the _second temperature increase were measured to determine the thermal stability of the PBT resin composition during melting (transesterification resistance). Was evaluated.

[Measurement of Tensile Strength and Tensile Elongation of Molded Article] Using the pellets of the PBT resin composition of each Example or Comparative Example as a molding material, an 80-ton injection molding machine manufactured by Nissei Plastic Industry Co., Ltd. was used. Then, the cylinder temperature is 25
Injection molding was carried out under conditions of 0 ° C, residence time in cylinder of 150 seconds and mold temperature of 70 ° C to produce JIS No. 1 test piece, and the test piece was used to measure tensile strength and tensile strength according to JIS K7113. The elongation was measured.

[Measurement of Molding Shrinkage of Molded Article] Using the pellets of the PBT resin composition of each Example or Comparative Example as a molding material, an 80-ton injection molding machine manufactured by Nissei Plastic Industry Co., Ltd. was used. Injection molding under the conditions of a cylinder temperature of 250 ° C., a residence time in the cylinder of 150 seconds and a mold temperature of 70 ° C. to produce a flat plate of 80 × 80 × 3 mm, and the resin flow direction of the obtained flat plate. Parallel direction (MD)
And the dimension in the vertical direction (TD) were respectively measured, and compared with the cavity dimension of the mold, the molding shrinkage rates in the parallel direction (MD) and the vertical direction (TD) were respectively determined.

Reference Example 1 [Production of PBT resin (polybutylene terephthalate resin)] 100 parts of dimethyl terephthalate, 60 parts of 1,4-butanediol and 0.04 of tetraisopropyl titanate.
Parts were charged into a transesterification reaction tank, and the transesterification reaction was carried out by heating while gradually raising the temperature from 145 ° C. to 230 ° C. under normal pressure, and the transesterification reaction was stopped when 26 parts of methanol was distilled ( (Time required: about 2 hours). Here, the system was transferred to a reduced pressure, and the resin temperature was set to 240 ° C. under reduced pressure (0.3 mmHg) to carry out a polycondensation reaction for 90 minutes. After the reaction, the reaction tank was pressurized with nitrogen gas, the PBT resin generated from the bottom of the reaction tank was extruded out of the tank, taken out, and cut into chips. The intrinsic viscosity [η] of the obtained PBT resin chip was 0.9, and the b value (coloring value) was 3.

Example 1 95 parts of the PBT resin obtained in Reference Example 1 above, 5 parts of a bisphenol A type polycarbonate resin ("Panlite L1250" manufactured by Teijin Chemicals),
Brominated Polycarbonate (Great Lakes "BC-
58 ") 25 parts, antimony tetroxide (particle size 3-4 μm;
Made in Japan) 10 parts, alkyl acid phosphate;
O = P (OH) _n (OC ₁₈ H ₃₇ ) _3-n (where n = 1 to 2 mixture) (metal deactivator) 0.5 part and glass fiber 3
The mixture was mixed at a ratio of 0% (based on the total weight of the PBT-based resin composition), supplied to a twin-screw extruder (manufactured by Japan Steel Works), melt-kneaded at a cylinder temperature of 240 ° C., and a diameter of 2 from a die. It was extruded into a strand of 0.5 mm, cooled with water, and then cut to produce a pellet of the PBT resin composition having a length of about 3 mm. The pellets were evaluated or measured for thermal stability (transesterification resistance) during melting, tensile strength, tensile elongation and molding shrinkage by the above-mentioned method. The results are shown in Table 1 below. It was the result.

Example 2 A pellet of a PBT resin composition was produced in the same manner as in Example 1 except that 90 parts of PBT resin and 10 parts of polycarbonate resin were used instead of 95 parts of PBT resin and 5 parts of polycarbonate resin. Then, the pellets were evaluated or measured for thermal stability (transesterification resistance) during melting, tensile strength, tensile elongation and molding shrinkage by the method described above, and the results are shown in Table 1 below. The result was as follows.

Example 3 PBT-based resin composition pellets were produced in the same manner as in Example 1 except that 80 parts of PBT resin and 20 parts of polycarbonate resin were used instead of 95 parts of PBT resin and 5 parts of polycarbonate resin. Then, the pellets were evaluated or measured for thermal stability (transesterification resistance) during melting, tensile strength, tensile elongation and molding shrinkage by the method described above, and the results are shown in Table 1 below. The result was as follows.

Comparative Example 1 PBT-based resin composition pellets were produced in the same manner as in Example 1 except that 100 parts of PBT resin was used instead of 95 parts of PBT resin and 5 parts of polycarbonate resin. Using the above methods, the thermal stability (transesterification resistance) during melting, tensile strength, tensile elongation and molding shrinkage were evaluated or measured, and the results are as shown in Table 1 below. It was

Comparative Example 2 PBT-based resin composition pellets were produced in the same manner as in Example 3 except that antimony trioxide (particle size: 4 μm; made by Nippon Seinen) was used instead of antimony tetraoxide. Using these pellets, the thermal stability during melting (transesterification resistance) by the method described above,
When the tensile strength, tensile elongation and molding shrinkage were evaluated or measured, the results were as shown in Table 1 below.

Comparative Example 3 PBT was prepared in the same manner as in Example 3 except that the alkyl acid phosphate was not used.
A pellet of the resin composition was produced, and the pellet was used to evaluate or measure thermal stability (transesterification resistance) during melting, tensile strength, tensile elongation, and molding shrinkage by the method described above. However, the results were as shown in Table 1 below.

[0050]

[Table 1]

From the results in Table 1 above, PBT resin, polycarbonate resin (other thermoplastic resin containing ester bond), brominated polycarbonate (organic halogen flame retardant), antimony tetroxide and alkyl acid phosphate (metal deactivator). In the case of the PBT resin compositions of the present invention of Examples 1 to 3 containing all of 1), the heat distortion temperature of the test piece obtained by retaining and degrading in the cylinder of the injection molding machine is high, and The melting point peak temperature (Tm ₁ ) during the _first temperature increase, the crystallization temperature peak temperature (Tcc) during the temperature decrease, and the melting point peak temperature (Tm ₂ ) during the _second temperature increase are both high. Moreover, the molding shrinkage rate is low, the physical properties of the PBT resin composition are not significantly deteriorated even when it is heated and melted, and the thermal stability at the time of melting is excellent, that is, the PBT resin and the polycarbonate. It can be seen that the transesterification reaction with the nate resin is unlikely to occur. On the other hand, in the case of the PBT resin composition of Comparative Example 1 containing no polycarbonate resin, it can be seen that a molded product having a high molding shrinkage ratio and high dimensional accuracy cannot be obtained.

Further, the PBT resin composition of Comparative Example 2 using antimony trioxide instead of antimony tetraoxide, the heat distortion temperature of the test piece, the melting point peak temperature (Tm at the first temperature rise) ₁ ), both the peak temperature (Tcc) of the crystallization temperature during the temperature decrease and the melting point peak temperature (Tm ₂ ) during the _second temperature increase are lower than those in Examples 1 to 3,
The thermal stability at the time of melting is poor, and from the results of Comparative Example 2, when antimony trioxide is used as the flame retardant aid, PBT resin, other ester bond-containing thermoplastic resin,
Organic halogen flame retardant, flame retardant aid (antimony trioxide)
It can be seen that if a PBT-based resin composition is manufactured by simultaneously mixing and a metal deactivator, a PBT-based resin composition having excellent melt stability cannot be obtained.

Further, the PBT resin composition of Comparative Example 3 containing no metal deactivator (alkyl acid phosphate) had a heat distortion temperature of the test piece and a melting point peak temperature (Tm ₁ ), Both the peak temperature (Tcc) of the crystallization temperature during the temperature decrease and the melting point peak temperature (Tm ₂ ) during the _second temperature increase are lower than those in Examples 1 to 3,
From these results, it is understood that the composition containing the PBT resin and the other thermoplastic resin containing an ester bond needs to contain the metal deactivator.

Example 4 PBT-based resin composition pellets having the same composition as in Example 2 were manufactured by a method different from that in Example 2. That is, 90 parts of PBT resin, 10 parts of antimony tetroxide and 0.5 part of alkyl acid phosphate were fed to the same twin-screw extruder used in Example 1 to melt-knead at a cylinder temperature of 260 ° C., followed by extrusion cutting. And made pellets. Next, 100.5 parts of the obtained pellet, 10 parts of polycarbonate resin, 25 parts of brominated polycarbonate and 30% of glass fiber.
After mixing at a ratio (based on the total weight of the PBT-based resin composition), the mixture was fed to the same twin-screw extruder to obtain a cylinder temperature of 2
After melt-kneading at 40 ° C., it was extruded from a die into a strand shape having a diameter of 2.5 mm and cut into a pellet of a PBT resin composition having a length of about 3 mm. The pellets were evaluated or measured for thermal stability (transesterification resistance) during melting, tensile strength, tensile elongation and molding shrinkage by the method described above, and the results are shown in Table 2 below. It was the result.

Example 5 PBT-based resin composition pellets having the same composition as those in Examples 2 and 4 were manufactured by a method different from those in Examples 2 and 4. That is, 90 parts of PBT resin, 10 parts of polycarbonate resin and 10 parts of antimony tetroxide were fed to the same twin-screw extruder used in Example 1, melt-kneaded at a cylinder temperature of 260 ° C., and then extruded and cut into pellets. Made.
Next, after mixing 110 parts of the obtained pellets, 25 parts of brominated polycarbonate, 0.5 part of alkyl acid phosphate and 30% of glass fiber (based on the total weight of the PBT resin composition), the same twin screw extruder After being melt-kneaded at a cylinder temperature of 240 ° C., it was extruded from the die into a strand having a diameter of 2.5 mm and cut into a pellet of the PBT resin composition having a length of about 3 mm. The pellets were evaluated or measured for thermal stability (transesterification resistance) during melting, tensile strength, tensile elongation and molding shrinkage by the method described above, and the results are shown in Table 2 below. It was the result.

Example 6 PBT-based resin composition pellets having the same composition as in Example 3 were manufactured by a method different from that in Example 3. That is, 80 parts of PBT resin, 10 parts of antimony tetroxide and 0.5 part of alkyl acid phosphate were fed to the same twin-screw extruder used in Example 1 to melt-knead at a cylinder temperature of 260 ° C., and then extrusion cutting. And made pellets. Next, 90.5 parts of the obtained pellets, 20 parts of polycarbonate resin, 25 parts of brominated polycarbonate and 30% of glass fiber (P
(Based on the total weight of the BT resin composition) and then fed to the same twin-screw extruder to obtain a cylinder temperature of 240
After melt-kneading at ℃, extruded from the die into a strand with a diameter of 2.5 mm and cutting it into a PB with a length of about 3 mm.
Pellets of the T-based resin composition were manufactured. The pellets were evaluated or measured for thermal stability (transesterification resistance) during melting, tensile strength, tensile elongation and molding shrinkage by the method described above, and the results are shown in Table 2 below. It was the result.

Example 7 PBT-based resin composition pellets having the same composition as those in Examples 3 and 6 were produced by a method different from those in Examples 3 and 6. That is, 80 parts of PBT resin, 20 parts of polycarbonate resin and 10 parts of antimony tetroxide were supplied to the same twin-screw extruder as used in Example 1, melt-kneaded at a cylinder temperature of 260 ° C., and then extruded and cut into pellets. Made.
Next, after mixing 110 parts of the obtained pellets, 25 parts of brominated polycarbonate, 0.5 part of alkyl acid phosphate and 30% of glass fiber (based on the total weight of the PBT resin composition), the same twin screw extruder After being melt-kneaded at a cylinder temperature of 240 ° C., it was extruded from the die into a strand having a diameter of 2.5 mm and cut into a pellet of the PBT resin composition having a length of about 3 mm. The pellets were evaluated or measured for thermal stability (transesterification resistance) during melting, tensile strength, tensile elongation and molding shrinkage by the method described above, and the results are shown in Table 2 below. It was the result.

[0058]

[Table 2]

In addition, in Table 2 above, in order to show the difference in the physical properties of the PBT-based resin composition due to the difference in the manufacturing method of the PBT-based resin composition pellets, the results of Example 2 and Example 3 described above are simultaneously shown. Described.

From the results shown in Table 2 above, when the PBT resin composition of the present invention was produced by using antimony tetraoxide as the flame retardant aid, the method for producing the PBT resin composition (method of mixing each component) Regardless of the above, the heat distortion temperature is high, and the melting point peak temperature (Tm ₁ ) during the first temperature increase, the crystallization temperature peak temperature (Tcc) during the temperature decrease, and the second temperature increase during the temperature increase It can be seen that a molded product having a high melting point peak temperature (Tm ₂ ), a low molding shrinkage ratio, excellent thermal stability during melting, and high dimensional accuracy can be obtained. Then, among them, particularly, PBT resin, antimony tetroxide and alkyl acid phosphate are melt-kneaded, and then the pellets of the obtained mixture are mixed with polycarbonate resin, brominated polycarbonate and glass fiber and melt-kneaded to obtain a PBT-based resin composition. When the method of Examples 4 and 6 in which the product pellets are manufactured is adopted, the heat distortion temperature is high, and the melting point peak temperature (Tm ₁ ) during the _first temperature increase and Both the peak temperature (Tcc) of the crystallization temperature and the melting point peak temperature (Tm ₂ ) at the time of the second heating are high, and the PBT resin composition having excellent thermal stability during melting, that is, transesterification It can be seen that a PBT resin composition with reduced reaction can be obtained.

Example 8 PBT-based resin composition pellets were produced in the same manner as in Example 6 except that antimony trioxide was used instead of antimony tetraoxide as the flame retardant aid, and the pellets were used. , Thermal stability during melting (transesterification resistance), tensile strength,
When the tensile elongation and the molding shrinkage were evaluated or measured, the results were as shown in Table 3 below.

[0062]

[Table 3]

Table 3 above shows the PB obtained in Example 8.
In order to clarify the physical properties of the T-based resin composition, the results of Example 3 and Comparative Example 2 described above are also shown.

From the results of Table 3 above, even when an antimony compound other than antimony tetraoxide is used as the flame retardant aid, the PBT resin, the antimony compound (antimony trioxide) and the metal deactivator (alkyl acid) are used. After melt-kneading the phosphate), a polycarbonate resin (other thermoplastic resin containing an ester bond) and an organic halogen-based flame retardant (brominated polycarbonate) are mixed with the pellets of the obtained mixture, and melt-kneading is performed. In the case of Example 8, as compared with Comparative Example 2 in which such a melt-kneading method was not adopted, the heat distortion temperature was the same as in Example 3 using antimony tetroxide as a flame retardant aid. And the melting point peak temperature (T
m ₁ ), the peak temperature (Tcc) of the crystallization temperature at the time of cooling, and the melting point peak temperature (Tm ₂ ) at the time of the second temperature rising are high, and the PBT system is excellent in thermal stability during melting. Resin composition, ie PB with reduced transesterification reaction
It can be seen that a T-based resin composition can be obtained.

Example 9 PBT-based resin composition pellets were produced in the same manner as in Example 3 except that glass fiber was not added, and the pellets were used for the thermal stability (resistance to heat) during melting by the method described above. Ester exchange reactivity), tensile strength, tensile elongation and molding shrinkage were evaluated or measured, and the results were as shown in Table 4 below.

Example 10 PBT-based resin composition pellets were produced in the same manner as in Example 6 except that glass fiber was not added, and the pellets were used for the thermal stability (resistance to heat) during melting by the method described above. Ester exchange reactivity), tensile strength, tensile elongation and molding shrinkage were evaluated or measured, and the results were as shown in Table 4 below.

Example 11 PBT-based resin composition pellets were produced in the same manner as in Example 8 except that glass fibers were not added, and the pellets were used to perform thermal stability (resistance to heat) during melting by the method described above. Ester exchange reactivity), tensile strength, tensile elongation and molding shrinkage were evaluated or measured, and the results were as shown in Table 4 below.

Comparative Example 4 PBT-based resin composition pellets were produced in the same manner as in Comparative Example 2 except that glass fiber was not added, and the pellets were used for the thermal stability (resistance to melting) by the above-described method. Ester exchange reactivity), tensile strength, tensile elongation and molding shrinkage were evaluated or measured, and the results were as shown in Table 4 below.

[0069]

[Table 4]

From the results shown in Table 4 above, when the PBT resin composition of the present invention was produced using antimony tetroxide as the flame retardant aid (Examples 9 and 10), the PBT resin composition Regardless of the manufacturing method (mixing method of each component), the heat distortion temperature is high, and the melting point peak temperature (Tm ₁ ) during the first temperature increase, the crystallization temperature peak temperature (Tcc) during the temperature decrease, and A high melting point peak temperature (Tm ₂ ) during the _second temperature rise, high tensile strength and tensile elongation, excellent thermal stability during melting, and a molded product with good mechanical properties were obtained. You can see that Then, among them, particularly, PBT resin, antimony tetroxide, and metal deactivator (alkyl acid phosphate) are melt-kneaded, and then the pellets of the obtained mixture are mixed with other ester bond-containing thermoplastic resin (polycarbonate resin) and organic halogen. When a PBT resin composition is produced by mixing a flame retardant (brominated polycarbonate) and melt kneading (Example 10), the heat distortion temperature, Tm ₁ , Tc.
It can be seen that a molded product having a high c and Tm _2, a high tensile strength and a high tensile elongation, an excellent thermal stability during melting, and good mechanical properties can be obtained.

From the results shown in Table 4 above, even when an antimony compound other than antimony tetroxide was used as the flame retardant aid, the PBT resin, the antimony compound (antimony trioxide) and the metal deactivator were used. After melt-kneading (alkyl acid phosphate), the pellets of the obtained mixture are mixed with other ester bond-containing thermoplastic resin (polycarbonate resin) and organic halogen-based flame retardant (brominated polycarbonate) and melt-kneaded. PBT
When a resin composition is manufactured (Example 11),
Compared with the case where such a melt-kneading method is not adopted (Comparative Example 4), the heat distortion temperature, Tm ₁ , Tcc and Tm are increased.
_It can be seen that all of the above-mentioned No. ₂ are high, the tensile elongation is large, the thermal stability at the time of melting is excellent, and a molded product having good mechanical properties can be obtained.

[0072]

The PBT resin composition of the present invention containing a PBT resin, another ester bond-containing thermoplastic resin, an organic halogen flame retardant, antimony tetroxide and a metal deactivator, and a PBT resin, The PBT resin composition of the present invention obtained by melt-mixing the antimony compound and the metal deactivator, and then melt-mixing the other ester bond-containing thermoplastic resin and organic halogen-based flame retardant into the mixture At times, the transesterification reaction between the PBT-based resin and the other thermoplastic resin having an ester bond is suppressed, the stability during melt processing becomes good, and the moldability, dimensional stability, and releasability are excellent, The molded product obtained from it has a good appearance without surface roughness, has excellent physical properties such as mechanical properties and heat resistance, and contains an organic halogen-based flame retardant and a flame retardant auxiliary. Therefore, it has extremely good flame retardancy, and it is strongly required to have flame retardancy along with characteristics such as dimensional accuracy, mechanical properties, and heat resistance, as well as automobile parts, mechanical parts, It can be effectively used for a wide range of applications such as office supplies and daily sundries.

Claims (5)

[Claims] 1. A polybutylene terephthalate resin (A); a thermoplastic resin having an ester bond other than a polybutylene terephthalate resin (B); an organic halogen flame retardant (C); antimony tetroxide (D); and a metal. A polybutylene terephthalate-based resin composition comprising an inactivating agent (E). 2. The ratio of the polybutylene terephthalate resin (A): the thermoplastic resin (B) having an ester bond other than the polybutylene terephthalate resin is 9 by weight.
It is 5: 5 to 50:50, and 10 to 4 of the organohalogen flame retardant (C) is added to 100 parts by weight of the polybutylene terephthalate resin (A) and the thermoplastic resin (B) in total.
The polybutylene terephthalate resin composition according to claim 1, which contains 0 parts by weight, 3 to 15 parts by weight of antimony tetroxide (D), and 0.01 to 5 parts by weight of the metal deactivator (E). 3. A polybutylene terephthalate resin (A); a thermoplastic resin (B) having an ester bond other than the polybutylene terephthalate resin; an organic halogen flame retardant (C); an antimony compound (D '); and a metal. A method for producing a polybutylene terephthalate resin composition containing a deactivator (E), comprising melting an antimony compound (D ') and a metal deactivator (E) in a polybutylene terephthalate resin (A). It is characterized in that a mixture is prepared by mixing, and then the mixture obtained above, the thermoplastic resin (B) having an ester bond other than the polybutylene terephthalate resin and the organohalogen flame retardant (C) are melt-mixed. A method for producing a polybutylene terephthalate resin composition. 4. A polybutylene terephthalate resin composition produced by the method of claim 3. 5. A molded article comprising the polybutylene terephthalate resin composition according to any one of claims 1, 2 and 4.