JP2000109670A - Thermoplastic resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide thermoplastic resin compositions which are excellent in mechanical strength, flame retardance and external appearance of molded articles and are translucent or transparent. SOLUTION: Thermoplastic resin compositions comprise 100 pts.wt. sum of (A) 95-5 pts.wt. aromatic polycarbonate and (B) 5-95 pts.wt. polystyrene; (C) 1-50 pts.wt. melt kneaded resin composition comprising a polyphenylene ether and a saturated polyester; (D) 1-100 pts.wt. phosphate ester compound; and (E) 0-2 pts.wt. polytetrafluoroethylene.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a thermoplastic resin composition, and more particularly to a transparent or translucent thermoplastic resin composition.

[0002]

2. Description of the Related Art Polycarbonate resins have excellent transparency and are widely used industrially in the fields of automobiles, office automation equipment, electronics and electrics, but their flowability is not sufficient. In the case of using it for a thin molded product, measures such as raising the molding temperature have been taken, but the drawbacks associated with molding at a high temperature have occurred.

As a method of improving the fluidity, a method of blending an ABS resin, a HIPS resin, or the like with a polycarbonate resin is known. Further, a flame-retardant resin composition containing a phosphate compound is disclosed in -11526
No. 2, JP-A-2-32154 and JP-A-8-32154
As described in JP-A-239564, these resin compositions have insufficient transparency.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a thermoplastic resin composition comprising aromatic polycarbonate and polystyrene, which is excellent in mechanical strength, flame retardancy and appearance of a molded product, and is translucent or transparent. To provide.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its gist is that (A) 95 to 5 parts by weight of an aromatic polycarbonate and (B)
A thermoplastic resin composition comprising a predetermined amount of the following components (C) to (E) with respect to a total of 100 parts by weight of polystyrene of 5 to 95 parts by weight. (C) Melt kneading resin composition containing 1 to 50 parts by weight of (D) phosphate compound 1 to 100 parts by weight (E) 0 to 2 parts by weight of polytetrafluoroethylene

Hereinafter, the present invention will be described in detail. (A) Aromatic polycarbonate The aromatic polycarbonate in the present invention may be branched, which can be obtained by reacting an aromatic hydroxy compound or a small amount thereof with a phosgene or carbonic acid diester. , A polycarbonate polymer or a copolymer. These polycarbonate polymers or copolymers may be used as a mixture of two or more kinds.

As aromatic dihydroxy compounds, 2,
2-bis (4-hydroxyphenyl) propane (= bisphenol A), tetramethylbisphenol A, bis (4-hydroxyphenyl) -p-diisopropylbenzene, hydroquinone, resorcinol, 4,4′-dihydroxydiphenyl, and the like, Preferably, bisphenol A is used.

In order to obtain a branched aromatic polycarbonate, phloroglucin, 4,6-dimethyl-2,4,6-
Tri (4-hydroxyphenyl) heptene-2,4,6
-Dimethyl-2,4,6-tri (4-hydroxyphenyl) heptane, 2,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) heptene-3,1,3,5
-Tri (4-hydroxyphenyl) benzene, 1,1,
Polyhydroxy compounds such as 1-tri (4-hydroxyphenyl) ethane, 3,3-bis (4-hydroxyaryl) oxindole (= isatin bisphenol),
5-chlorisatin, 5,7-dichlorisatin, 5-
A polyfunctional compound such as bromoisatin may be used as a part of the aromatic dihydroxy compound.
It is 0.01 to 10 mol%, preferably 0.1 to 2 mol%.

In order to control the molecular weight, a monovalent aromatic hydroxy compound may be used, and m- and p-methylphenol, m- and p-propylphenol, p-tert-
Butylphenol and p-long-chain alkyl-substituted phenols. The aromatic polycarbonate resin is preferably a polycarbonate resin derived from 2,2-bis (4-hydroxyphenyl) propane, or a resin derived from 2,2-bis (4-hydroxyphenyl) propane and another aromatic dihydroxy compound. Polycarbonate copolymer to be used.

The aromatic polycarbonate has a viscosity average molecular weight of 25 ° C. using methylene chloride as a solvent.
In the value converted from the solution viscosity measured in, preferably,
12,000 to 100,000, more preferably 16,000 to 30,000, most preferably 1
8,000-23,000.

(B) Polystyrene The polystyrene in the present invention includes a homopolymer obtained by polymerizing a styrene monomer. In the polymerization of the styrene monomer, some styrene monomers such as α-methylstyrene and p-methylstyrene may be used.
By blending polystyrene, a thermoplastic resin excellent in transparency, color tone, and moldability can be obtained as compared with the case where a graft copolymer or the like is blended.

The polystyrene is a rubber-free styrene polymer, and commercially available polystyrene can be used or can be produced by a known method. Examples of the production method include an emulsion polymerization method, a solution polymerization method, a suspension polymerization method, and a bulk polymerization method. The weight average molecular weight of the polystyrene is preferably from 100,000 to 50
It is about 0000. The weight average molecular weight can be determined, for example, by a light scattering method.

(C) A melt-kneaded resin composition comprising a blend of polyphenylene ether and a saturated polyester. (A) Polyphenylene ether The polyphenylene ether is a homopolymer or copolymer having a structure represented by the following general formula (4). Is mentioned.

[0014]

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Wherein Q ¹ represents a halogen atom, a primary or secondary alkyl group, a phenyl group, an aminoalkyl group, a hydrocarbonoxy group or a halohydrocarbonoxy group, and Q ² represents a hydrogen atom , A halogen atom, a primary or secondary alkyl group, a phenyl group, a haloalkyl group, a hydrocarbonoxy group or a halohydrocarbonoxy group, and m represents a number of 10 or more.)

The primary alkyl group for Q ¹ and Q ² includes methyl, ethyl, n-propyl, n-butyl, n-
Amyl, isoamyl, 2-methylbutyl, n-hexyl, 2,3-dimethylbutyl, 2-, 3- or 4-
Methylpentyl, heptyl and the like can be mentioned. As the secondary alkyl group, isopropyl, sec-butyl, 1
-Ethylpropyl and the like. Q ¹ is preferably an alkyl group or a phenyl group, particularly preferably an alkyl group having 1 to 4 carbon atoms, and Q ² is preferably a hydrogen atom.

The homopolymer of polyphenylene ether includes, for example, a polymer comprising 2,6-dimethyl-1,4-phenylene ether units. As the copolymer, the above unit and 2,3,6-trimethyl-1,4-
And a random copolymer comprising a combination with a phenylene ether unit.

The intrinsic viscosity of the polyphenylene ether is preferably 0.2 to 0.2 as measured at 30 ° C. in chloroform.
0.8 dl / g, more preferably 0.25
0.7 dl / g, most preferably 0.3 to 0.1.
6 dl / g. When the intrinsic viscosity is less than 0.2 dl / g, the impact resistance is insufficient, and when the intrinsic viscosity is 0.8 dl / g or more, the gel content is large and the appearance of the molded article is difficult.

(B) Saturated Polyester The saturated polyester in the present invention includes a polymer having a -CO-O- bond in the polymer main chain and capable of being melted by heating. Various thermoplastic polyesters can be used.
Examples of the saturated polyester include, for example, a polyester obtained by polycondensing dicarboxylic acid or its lower alkyl ester, acid halide or acid anhydride derivative with glycol or dihydric phenol.

The dicarboxylic acids include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, suberic acid,
Aliphatic dicarboxylic acids such as azelaic acid and sebacic acid, terephthalic acid, isophthalic acid, p, p'-dicarboxydiphenyl sulfone, p-carboxyphenoxyacetic acid, p
-Carboxyphenoxypropionic acid, p-carboxyphenoxybutyric acid, p-carboxyphenoxyvaleric acid,
Examples thereof include aromatic dicarboxylic acids such as 2,6-naphthalene dicarboxylic acid and 2,7-naphthalene dicarboxylic acid, and mixtures of these carboxylic acids.

As the glycol, a linear alkylene glycol having 2 to 12 carbon atoms, for example, ethylene glycol,
In addition to aliphatic glycols such as 1,3-propylene glycol, 1,4-butene glycol, 1,6-hexene glycol, and 1,12-dodecamethylene glycol,
Examples include aliphatic glycols such as 4-cyclohexanedimethanol and aromatic glycols such as p-xylylene glycol. Examples of the dihydric phenol include pyrocatechol, resorcinol, hydroquinone, and alkyl-substituted derivatives of these compounds.

In addition, polyesters obtained by ring-opening polymerization of lactones such as polypivalolactone and poly (ε-caprolactone) can also be used. Furthermore, a polymer that forms a liquid crystal in a molten state (Thermotropic)
Liquid Crystal Polymer; T
Polyesters (LCP) can also be used. Typical examples of the liquid crystalline polyester include X7G manufactured by Eastman Kodak Company, Xydar (Zyder) manufactured by Dartco, Econol manufactured by Sumitomo Chemical Co., and Vectra manufactured by Celanese Corporation.

Specific examples of the saturated polyester are preferably polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), poly (1,4-cyclohexane dimethylene terephthalate) (PCT) or the above. Liquid crystalline polyester and the like can be mentioned.

The intrinsic viscosity of the saturated polyester is as follows: phenol / 1,1,2,2-tetrachloroethane = 50/50
0.3% as measured at 30 ° C. in a weight% mixed solution.
5.0 dl / g, more preferably 0.4 to 4.0.
dl / g, most preferably 0.5 to 2.0 dl / g.
g. If the intrinsic viscosity is less than 0.3 dl / g, the impact resistance is insufficient, and if it exceeds 5.0 dl / g, the moldability decreases.

(C) Phosphite Compound The phosphite compound in the present invention is a phosphorus compound containing trivalent phosphorus in the molecule.
The compound represented by the general formula (1) or (6) is exemplified, and more preferably, the compound represented by the general formula (1) is exemplified. When the compound represented by the general formula (1) is used, a material that does not easily cause poor appearance even when molded at a relatively high temperature can be obtained. As the phosphite compound, two or more compounds can be used in combination.

[0026]

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In the general formula (1), R ¹ represents an alkyl group having 1 to 20 carbon atoms or an aromatic group or a substituted aromatic group having 6 to 30 carbon atoms, preferably an aromatic group having 6 to 30 carbon atoms. Or a substituted aromatic group. n represents a number of 1 or 2; R ² represents an alkylene group or an arylene group having 2 to 18 carbon atoms when n is 1; and an alkyltetrayl group having 4 to 18 carbon atoms when n is 2. And R ¹ may be the same or different. Also, R ¹ and R ²
May be a substituent containing an oxygen atom, a nitrogen atom, a sulfur atom or a halogen atom.

Specific examples of R ¹ include methyl, ethyl, propyl, octyl, isooctyl, isodecyl, decyl, stearyl, lauryl, phenyl, 2-, 3- or 4-methyl. Phenyl group, 2,4
-, 2,6-dimethylphenyl group, 2,3,6-trimethylphenyl group, 2-, 3- or 4-ethylphenyl group, 2,4-, 2,6-diethylphenyl group, 2,3,
6-triethylphenyl group, 2-, 3- or 4-te
rt-butylphenyl group, 2,4-, 2,6-di-te
rt-butylphenyl group, 2,6-di-tert-butyl-6-methylphenyl group, 2,6-di-tert-butyl-6-ethylphenyl group, octylphenyl group, isooctylphenyl group, 2-, Examples thereof include a 3- or 4-nonylphenyl group, a 2,4-dinolisphenyl group, a biphenyl group, and a naphthyl group.

When n is 1 as R ² , for example,
Examples thereof include a 1,2-phenylene group, an ethylene group, a propylene group, a trimethylene group, a tetramethylene group, and a hexamethylene group. When n is 2, for example, tetrayl having a pentaerythrityl structure represented by the general formula (5) And the like.

[0030]

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In the general formula (5), R ^{10 to} R ¹⁷ each represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

Examples of the phosphite compound represented by the general formula (1) include a phosphite in which R ¹ is an aliphatic group, a phosphite in which R ¹ is an aromatic group or a substituted aromatic group, and the like. And preferably a phosphite in which R ¹ is an aromatic group or a substituted aromatic group. Specific examples of the phosphite wherein R ¹ is an aliphatic group include diisodecyl pentaerythritol diphosphite, dilauryl pentaerythritol diphosphite, distearyl pentaerythritol diphosphite and the like.

When R ¹ is an aromatic group or a substituted aromatic group and n is 1, specific examples of the phosphite compound include (phenyl) (1,3-propanediol) phosphite and (4 -Methylphenyl) (1,3-propanediol) phosphite, (2,6-dimethylphenyl) (1,3-propanediol) phosphite, (4
-Tert-butylphenyl) (1,3-propanediol) phosphite, (2,4-di-tert-butylphenyl) (1,3-propanediol) phosphite, (2,6-di-tert-butyl) Phenyl) (1,
3-propanediol) phosphite, (2,6-di-
tert-butyl-4-methylphenyl) (1,3-propanediol) phosphite, (phenyl) (1,2
-Ethanediol) phosphite, (4-methylphenyl) (1,2-ethanediol) phosphite,
6-dimethylphenyl) (1,2-ethanediol) phosphite, (4-tert-butylphenyl) (1,
2-ethanediol) phosphite, (2,4-di-t)
tert-butylphenyl) (1,2-ethanediol)
Phosphite, (2,6-di-tert-butylphenyl) (1,2-ethanediol) phosphite,
6-di-tert-butyl-4-methylphenyl)
(1,2-ethanediol) phosphite, (2,6-
Di-tert-butyl-4-methylphenyl) (1,4
-Butanediol) phosphite and the like.

Specific examples of the phosphite compound when n is 2 include diphenylpentaerythritol diphosphite, bis (2-methylphenyl) pentaerythritol diphosphite, and bis (3-methylphenyl)
Pentaerythritol diphosphite, bis (4-methylphenyl) pentaerythritol diphosphite, bis (2,4-dimethylphenyl) pentaerythritol diphosphite, bis (2,6-dimethylphenyl) pentaerythritol diphosphite, bis (2,3,6
-Trimethylphenyl) pentaerythritol diphosphite, bis (2-tert-butylphenyl) pentaerythritol diphosphite, bis (3-tert-
Butylphenyl) pentaerythritol diphosphite, bis (4-tert-butylphenyl) pentaerythritol diphosphite, bis (2,4-di-ter
t-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butylphenyl)
Pentaerythritol diphosphite, bis (2,6-
Di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2,6-di-te
rt-butyl-4-ethylphenyl) pentaerythritol diphosphite, bis (nonylphenyl) pentaerythritol diphosphite, bis (biphenyl) pentaerythritol diphosphite, dinaphthylpentaerythritol diphosphite and the like.

[0035]

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In the general formula (6), R ¹⁸ , R ¹⁹ and R ²⁰ each represent an alkyl group having 1 to 20 carbon atoms, an aromatic group having 6 to 30 carbon atoms or a substituted aromatic group. And an aromatic group having 6 to 30 carbon atoms or a substituted aromatic group. The substituent of R ¹⁸ , R ¹⁹ and R ²⁰ may be a substituent containing an oxygen atom, a nitrogen atom, a sulfur atom or a halogen atom, respectively. Specific examples of R ¹⁸ , R ¹⁹ and R ²⁰ include the groups shown as specific examples of R ¹ .

Specific examples of the phosphite compound represented by the general formula (6) include trioctyl phosphite,
Tridecyl phosphite, trilauryl phosphite,
Tristearyl phosphite, triisooctyl phosphite, tris (nonylphenyl) phosphite, tris (2,4-dinolylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, triphenyl Phosphite, tris (octylphenyl) phosphite, diphenylisooctylphosphite, diphenylisodecylphosphite, octyldiphenylphosphite, dilaurylphenylphosphite, diisodecylphenylphosphite, bis (nonylphenyl) phenylphosphite, diiso Octylphenyl phosphite and the like.

As the phosphite compound, bis (nonylphenyl) pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6- Di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite. The composition of the present invention may contain a compound generated by the decomposition (hydrolysis, thermal decomposition, or the like) of the phosphite compound.

(D) Phosphate Ester Compound The phosphate ester compound in the present invention is a phosphorus compound containing a pentavalent phosphorus in the molecule, and is preferably a compound represented by the general formula (2) or (3) And
More preferably, a compound represented by the general formula (2) is exemplified. When the compound represented by the general formula (2) is used, a molded article having less surface adhesion and less mold adhesion during molding can be obtained. As the phosphoric ester compound, two or more compounds can be used in combination.

[0040]

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In the formula, R ^{3 to} R ⁶ each have 1 to 6 carbon atoms.
Represents an alkyl group or an aryl group having 6 to 20 carbon atoms which may be alkyl-substituted, p, q, r, and s each represent a number of 0 or 1, X represents an arylene group,
y represents an integer of 1 to 5.

Examples of the phosphate compound represented by the general formula (2) include condensed phosphate esters. Examples of the arylene group interposed between pentavalent phosphorus atoms include resorcinol, hydroquinone, and bisphenol A. And a group derived from a dihydroxy compound.

Specific examples of the condensed phosphate ester include X
Is a group derived from resorcinol, phenyl
Resorcinol polyphosphate, cresyl resorcinol polyphosphate, phenyl cresyl resorcinol polyphosphate, xylyl resorcinol polyphosphate, phenyl-p-tert-butylphenyl
Examples include resorcin polyphosphate, phenyl isopropyl phenyl resorcin polyphosphate, cresyl xylyl resorcin polyphosphate, phenyl isopropyl phenyl diisopropyl phenyl resorcin polyphosphate, and the like.

[0044]

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In the formula, R ^{7 to} R ⁹ each have 1 to 6 carbon atoms.
Represents an alkyl group or an aryl group having 6 to 20 carbon atoms which may be alkyl-substituted, and u, v, and w each represent
Represents a number of 0 or 1.

As the phosphoric ester compound represented by the above formula (3), triphenyl phosphate, tricresyl phosphate, diphenyl 2-ethylcrisyl phosphate, tri (isopropylphenyl) phosphate, diphenyl methylphosphonate, diethyl phenylphosphonate Esters, diphenylcresyl phosphate, tributyl phosphate and the like. These compounds can be produced from phosphorus oxychloride or the like by a known method.

(E) Polytetrafluoroethylene resin Polytetrafluoroethylene in the present invention includes:
For example, polytetrafluoroethylene having a fibril-forming ability can be mentioned, which easily disperses in a polymer and shows a tendency to form a fibrous material by bonding the polymers. Polytetrafluoroethylene having fibril-forming ability is classified into Type 3 according to ASTM standards. Examples of polytetrafluoroethylene having a fibril-forming ability include, for example, from Mitsui-DuPont Fluorochemical Co., Ltd.
It is commercially available as Teflon 6J or Teflon 30J, or as polyflon from Daikin Industries, Ltd.

<Composition Ratio of Constituent Components> Component (A) of the present invention
The composition ratio of (E) to (E) is such that the total amount of (A) and (B) is 100
Parts by weight are as follows. The aromatic polycarbonate of the component (A) is 95 to 5 parts by weight, preferably 90 to 15 parts by weight, and more preferably 80 to 30 parts by weight. The amount of the polystyrene of the component (B) is 5 to 95 parts by weight, preferably 10 to 85 parts by weight, and more preferably 20 to 70 parts by weight. When the proportion of the component (A) in the resin composition is less than 5 parts by weight, mechanical properties are insufficient, and when it exceeds 95 parts by weight, moldability is insufficient. If the proportion of the component (B) is less than 5 parts by weight, the moldability is insufficient, and if it exceeds 95 parts by weight, the mechanical properties are insufficient.

The amount of the melt-kneaded resin composition of the component (C) is 1 to 50 parts by weight, preferably 1 to 30 parts by weight, per 100 parts by weight of the total of the components (A) and (B). And more preferably 2 to 20 parts by weight. If the amount is less than 1 part by weight, the effect of adding the compatibilizing agent is small, and the effect of improving the physical properties of the composition is insufficient.

The composition ratio of (a) to (c) constituting component (C) is such that the total amount of (a) and (b) is 100 parts by weight,
It is as follows. The polyphenylene ether of the component (a) is 95 to 20 parts by weight, preferably 85 to 55 parts by weight.
Parts by weight. The saturated polyester of the component (b)
80 parts by weight, preferably 15 to 45 parts by weight. If the proportion of the component (a) in the resin composition is less than 20% by weight, impact resistance, heat resistance and flame retardancy are insufficient, and 9
If it exceeds 5 parts by weight, the fluidity is insufficient. If the proportion of the component (b) is less than 5% by weight, the fluidity is insufficient, and if it exceeds 80% by weight, the impact resistance, heat resistance and flame retardancy are insufficient.

The compounding amount of the phosphite compound of the component (c) is 0.1 to 10 parts by weight, preferably 0.2 to 10 parts by weight, based on 100 parts by weight of the total of the components (a) and (b). ~
8 parts by weight. If the amount is less than 0.1 part by weight, the effect of adding the compatibilizing agent is small, and the effect of improving the physical properties of the composition is insufficient. If the amount exceeds 10 parts by weight, a problem may occur in the appearance of the molded article. .

The compounding amount of the phosphate compound of the component (D) is 1 to 100 parts by weight, preferably 5 to 50 parts by weight, per 100 parts by weight of the total of the components (A) and (B). is there. If the proportion of the component (D) exceeds 100 parts by weight, the heat resistance will be unsatisfactory.

When the phosphate compound of the component (D) is previously kneaded with the components of the melt-kneaded resin composition of the component (C), the amount of the component (D) to be added is as follows.
0 to 200 with respect to 100 parts by weight of the total amount of
Parts by weight, preferably 5 to 200 parts by weight, more preferably 10 to 50 parts by weight. If it exceeds 200 parts by weight, kneading tends to be insufficient.

The compounding amount of the polytetrafluoroethylene of the component (E) is 0 to 2 parts by weight, preferably 0 to 1.1 part by weight, per 100 parts by weight of the total of the components (A) and (B).
5 parts by weight. If the component (E) exceeds 2 parts by weight, the appearance of the molded article tends to be deteriorated.

<Additional Components> The thermoplastic resin composition of the present invention is added to the thermoplastic resin composition of the present invention in such an amount that various effects can be exerted within the range not impairing the effects of the present invention, for example, impact modifiers, antioxidants and the like. , Weather resistance improver, alkali soap, metal soap, hydrotalcite, plasticizer, flow improver, nucleating agent, flame retardant, anti-dripping agent, organic filler, inorganic filler, reinforcing agent, colorant and The dispersant, another thermoplastic resin and the like can be blended.

<Production Method of Composition> The production of the thermoplastic resin composition of the present invention is not limited to a specific method, but is preferably by melt-kneading, and the kneading method usually used for thermoplastic resins is used. Can be applied. However,
As the component (C), it is necessary to previously prepare a predetermined component as a melt-kneading composition, and by blending the melt-kneading composition of the component (C), the component (A) and the component (B) become macroscopic. Phase separation can be prevented to prevent the molded product from separating into a skin layer and a core layer.

As a kneading method, for example, the component (C),
If necessary, part or all of the component (D) is previously formed by a melt-kneading method or the like, and after pelletizing or powdering, the components (A) to (E) are added, if necessary, with additional components. After uniformly mixing with a certain substance by a Henschel mixer, a ribbon blender, a V-type blender, or the like, the mixture can be kneaded with a single-screw or multi-screw kneading extruder, a roll, a Banbury mixer, a Labo Plast mill (Bravender), or the like.

Each component, including additional components, may be fed to the kneader at once or may be fed sequentially. Also,
A mixture of two or more components selected from the components, including additional components, may be used in advance.

The kneading temperature and the kneading time can be arbitrarily selected depending on the conditions such as the kind of the kneading machine.
The kneading time is preferably 20 minutes or less at 50 to 350 ° C. 3
When the temperature exceeds 50 ° C. or 20 minutes, thermal deterioration of the aromatic polycarbonate or polystyrene becomes a problem, and the physical properties and appearance of the molded product may be deteriorated.

<Method of Forming Composition> The method of forming and processing the thermoplastic resin composition of the present invention is not particularly limited, and molding methods generally used for thermoplastic resins, that is, injection molding and hollow molding are used. Molding methods such as extrusion molding, press molding and the like can be applied.

The haze of the translucent molded product obtained from the thermoplastic resin composition of the present invention is preferably 60% or less, more preferably 5%, as measured on a test piece having a thickness of 2 mm.
0% or less, and the haze of the transparent molded product is 2 mm in thickness.
Is preferably 30% or less, and more preferably 20% or less.

[0062]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist. The abbreviations and contents of each component used in Examples and Comparative Examples are as follows. (1) Polycarbonate: 2,2-bis (4-oxyphenyl) propane-based polycarbonate (manufactured by Mitsubishi Engineering-Plastics Corporation, trade name Iupilon S2)
000, viscosity average molecular weight 25,000). (Hereafter, PC
Also called. (2) Polystyrene: polystyrene, (Mitsubishi Chemical Corporation)
(Trade name, Dialex HH-102). (Hereinafter P
Also called S. (3) HIPS resin: styrene-based graft copolymer (manufactured by Mitsubishi Chemical Corporation, trade name: Dialex HT478, rubber component polybutadiene). (Hereinafter also referred to as HIPS) (4) ABS resin: acrylonitrile / butadiene / styrene copolymer (manufactured by Mitsui Chemicals, Inc., trade name: Santac AT-05). (Hereinafter also referred to as ABS)

(5) Polyphenylene ether: poly (2,6-dimethyl-1,4-phenylene ether)
(Manufactured by Nippon Polyether Co., Ltd., trade name H-46, 30 ° C
Intrinsic viscosity measured in chloroform at 0.46 d
1 / g). (Hereinafter also referred to as PPE) (6) Saturated polyester: polybutylene terephthalate (manufactured by Mitsubishi Engineering-Plastics Corporation, trade name Novadur 5040ZS, phenol / 1,1,1)
(Intrinsic viscosity of 1.4 dl / g measured at 30 ° C in a 2,2-tetrachloroethane = 50/50 wt% mixture). At the time of kneading, what had been dried at 80 ° C. for 5 hours in advance was used. (Hereinafter, also referred to as PBT)

(7) Phosphite compound: bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite (Adeka Stab PEP-36, manufactured by Asahi Denka Co., Ltd.) . (Hereinafter, also referred to as phosphite) (8) Phosphate compound: phenyl resorcinol
Polyphosphate (manufactured by Daihachi Chemical Co., Ltd., trade name: CR73)
3S). (Hereinafter, also referred to as phosphoric ester-1) (9) Phosphate ester compound: xylyl resorcinol
Polyphosphate (made by Asahi Denka Co., Ltd., trade name: ADK STAB FP500). (Hereinafter, also referred to as phosphate ester-2.) (10) Phosphate ester compound: triphenyl phosphate (trade name: TPP, manufactured by Daihachi Chemical Co., Ltd.). (Hereinafter also referred to as phosphate ester-3) (11) Polytetrafluoroethylene: PTFE (trade name: Teflon 6 manufactured by DuPont-Mitsui Fluorochemicals Co., Ltd.)
-J). (Hereinafter, also referred to as PTFE)

The evaluation test was performed by the following method. (A) Flexural modulus: according to ASTM standard D-790
Using the prepared bending test piece, ASTM D-790
A bending test was performed. Flexural modulus is kg / cm ^Two Simply
Display in place. (B) Flammability: Flammability was prepared in accordance with UL Standard 94.
Using a 1/16 "thick test piece, UL Standard 94-2
A 0 mm vertical burn test was performed. (C) Oxygen index: The oxygen index is based on JIS K7201.
Using the A-1 combustion test piece prepared according to JIS
A combustion test of standard K7201 was performed.

(D) Transparency: The haze of a molded product having a thickness of 2 mm was measured. Haze is expressed in%. (E) Layered peeling: A tensile test of ASTM D-638 was performed using a tensile test piece prepared according to ASTM standard D-638, and the presence or absence of layered peeling of the fractured surface was visually observed. The evaluation was based on the following criteria. That is, ○
No delamination, x indicates delamination.

[Examples 1 to 8] Each of components (a) to (c) constituting component (C) and, if necessary, part or all of component (D) were prepared according to Table 1 or Table At the mixing ratio shown in FIG. 2, the mixture was sufficiently mixed and stirred by a super mixer, and then supplied to a twin screw extruder (TEX30HSST) manufactured by Nippon Steel Corporation with a vent port, and placed downstream of the first hopper. The mixture was melted and kneaded under a kneading condition of a set temperature of 250 ° C. and a screw rotation speed of 200 rpm at a reduced pressure of 10 Torr from the vent port to form a composition and then pelletized. This was dried at 60 ° C. for 8 hours with a hot air drier to obtain Component (C). The production rate was 15 kg / hr.

Next, the components (A) to (E) were sufficiently mixed and stirred at the mixing ratios shown in Table 1 or Table 2, and then the mixture was mixed with a biaxial screw manufactured by Nippon Steel Corporation with a vent port. Type extruder (TE
X30HSST), and the pressure is reduced to 10 Torr from a vent port installed downstream of the first hopper.
Under a kneading condition of 20 ° C. and a screw rotation speed of 150 rpm, the mixture was melt-kneaded to form a composition, and then pelletized to obtain a thermoplastic resin composition. The production rate was 15 kg / hr. The obtained pellets were dried at 80 ° C. for 6 hours in advance and injection molded to obtain various test pieces. The evaluation results are shown in Table-1 or Table-2.

[0069]

[Table 1]

[0070]

[Table 2]

[Comparative Example 1] In the mixing ratio shown in Table 3, the melt kneading of the former stage was not performed, and only the melt kneading of the latter stage was performed.
Was performed in the same manner as described above to obtain pellets. The obtained pellet is
After drying at 80 ° C. for 6 hours in advance, injection molding was performed to obtain various test pieces. Table 3 shows the evaluation results. [Comparative Examples 2 to 3] With the compounding ratios shown in Table 3, only the subsequent melt-kneading was performed in the same manner as in Example 1 to obtain pellets. The obtained pellets were dried at 80 ° C. for 6 hours in advance and injection molded to obtain various test pieces. Table 3 shows the evaluation results. [Comparative Examples 4 and 5] At the compounding ratios shown in Table 3, melt kneading in the first stage and melt kneading in the second stage were performed in the same manner as in Example 1 to obtain pellets. The obtained pellets were dried at 80 ° C. for 6 hours in advance and injection molded to obtain various test pieces. Table 3 shows the evaluation results.

[0072]

[Table 3]

[0073]

The thermoplastic resin composition of the present invention is excellent in mechanical strength, flame retardancy and appearance of a molded product, and is translucent to transparent, and is a material for electronic / electric products, automobile parts, and various industrial parts. Very useful as.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 67/00 C08L 67/00 71/12 71/12 (72) Inventor Shinya Miya Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture 5-6-2 Mitsubishi Engineering Plastics Co., Ltd. Technology Center (72) Inventor Kenichi Narita 5-6-1-2 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture Mitsubishi Engineering Plastics Co., Ltd. Technology Center (72) Invention Person Kiyoji Takagi 5-6-1 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture F-term in Mitsubishi Engineering-Plastics Corporation Technical Center 4J002 BC03X BD15U CF03Z CF06Z CF07Z CF08Z CG00W CH07Y EW046 EW067 FD036 FD037

Claims (6)

[Claims] (A) Aromatic polycarbonate 95 to 5
(B) 5 to 95 parts by weight of polystyrene and a total of 10 parts by weight
A thermoplastic resin composition comprising the following components (C) to (E) in predetermined amounts with respect to 0 parts by weight. (C) Melt kneading obtained by mixing polyphenylene ether and saturated polyester Resin composition 1 to 50 parts by weight (D) Phosphate ester compound 1 to 100 parts by weight (E) Polytetrafluoroethylene 0 to 2 parts by weight 2. The melt-kneaded resin composition of the component (C) is characterized in that a predetermined amount of the following component (c) is blended with 100 parts by weight of the following components (a) and (b) in total. The thermoplastic resin composition according to claim 1, wherein (A) 95 to 20 parts by weight of polyphenylene ether (b) 5-80 parts by weight of saturated polyester (c) 0.1 to 10 parts by weight of phosphite compound 3. The thermoplastic resin composition according to claim 2, wherein (c) the phosphite compound is a compound represented by the following general formula (1). Embedded image (In the formula (1), R ¹ represents an alkyl group having 1 to 20 carbon atoms, an aromatic group or a substituted aromatic group having 6 to 30 carbon atoms, n represents a number of 1 or 2, and R ² represents , When n is 1, it represents an alkylene group or an arylene group having 2 to 18 carbon atoms, and when n is 2, it represents an alkyltetrayl group having 4 to 18 carbon atoms, and R ¹ may be the same or different. Often, the substituents for R ¹ and R ² are oxygen, nitrogen,
It may be a substituent containing a sulfur atom or a halogen atom. ) 4. The thermoplastic resin according to claim 1, wherein (D) the phosphate compound is a phosphate compound represented by formula (2) or (3). Resin composition. Embedded image (In the formula (2), R ^{3 to} R ⁶ each have 1 to 1 carbon atoms.
6 represents an alkyl group having 6 or an aryl group having 6 to 20 carbon atoms which may be alkyl-substituted, and p, q, r, and s are
Each represents a number of 0 or 1, y represents an integer of 1 to 5, and X represents an arylene group. ) (In the formula (3), R ^{7 to} R ⁹ each have 1 to 1 carbon atoms.
Represents an alkyl group of 6 or an aryl group having 6 to 20 carbon atoms which may be alkyl-substituted, and u, v, and w each represent a number of 0 or 1. ) 5. The method according to claim 1, wherein (B) the polystyrene is a polymer obtained by polymerizing a styrene monomer.
5. The thermoplastic resin composition according to any one of items 1 to 4. 6. The composition according to claim 1, wherein a part or all of the phosphate compound of the component (D) is kneaded in advance with each component of the melt-kneaded resin composition of the component (C). 5. The method for producing a thermoplastic resin composition according to any one of the above items 5.