JP5243350B2 - Method for producing aromatic polycarbonate resin composition - Google Patents

Description

  The present invention relates to a method for producing an aromatic polycarbonate resin composition.

  Aromatic polycarbonate resins have excellent mechanical properties and are widely used industrially as raw materials in the automotive field, OA equipment field, electrical / electronic field, etc. Chemical properties and low surface hardness. In order to improve these properties, for example, many polymer alloys having a resin composition with a styrene resin such as ABS resin (acrylonitrile-butadiene-styrene copolymer) or a thermoplastic resin such as polyester resin have been proposed. (Patent Documents 1 to 4).

JP 2003-3060 A JP 2007-169616 A JP-A-10-298422 JP 2008-24863 A

  In the case of producing resin composition pellets of an aromatic polycarbonate resin and other thermoplastic resin by kneading and melt extrusion, the resin is sufficiently stirred in advance with a blender and supplied to an extruder in order to suppress variation in composition. However, if the resin powder characteristics differ greatly, such as when the aromatic polycarbonate resin is in the form of relatively fine flakes and the other thermoplastic resin is in the form of relatively large pellets, the blender should be sufficiently stirred. However, classification occurs in the path (feeder or hopper chute) from the blender to the extruder. Specifically, in a certain production batch, the ratio of materials with small particle sizes is initially large and gradually reverses. As a result, variations occur in the composition of each pellet, causing a problem that the quality of the resin composition is not stable.

  If the number of pellets used in one molded product is large, the variation in the composition of each pellet is averaged when the pellet is melted at the time of molding. Therefore, the variation in the composition of each pellet gives the quality of the molded product. The impact is small. However, the smaller the number of pellets used in a molded product, the greater the effect that variations in the composition of individual pellets have on the properties of the molded product.

When trying to solve such a problem, if the resin with greatly different powder characteristics is supplied to the hopper chute by an independent feeder, classification by the feeder does not occur, and thus variation in the composition of each pellet is suppressed. Is considered possible.
However, when a plurality of feeders are provided, there is a problem that the installation area of the extruder becomes very large as well as an increase in the cost of the feeders. Moreover, except for the case where the extruder is used only for a resin composition produced using a plurality of feeders, one of the feeders may not be used, which is undesirable from the viewpoint of operating efficiency.

  Furthermore, when pellets are produced by an extruder, not only the resin but also various additives are often used, but the additive is often in the form of a powder smaller than the resin. When such an additive is used, even if the resin is supplied by an independent feeder, it is difficult to evenly disperse the finer additive, and it is also possible to suppress variation in the composition of the pellet unit. It was difficult.

  An object of the present invention is to provide a production method capable of solving the above-described problems of the prior art and producing an aromatic polycarbonate resin composition excellent in quality stability.

  As a result of intensive research, the inventors of the present invention, when producing a resin composition of an aromatic polycarbonate resin and a thermoplastic resin other than the aromatic polycarbonate resin, the apparent density of one resin is the apparent density of the other resin. In addition to satisfying a specific relationship with the density, and when at least one of the resins is a pulverized product, it has been found that even when mixed and fed, variation in composition from pellet to pellet can be suppressed, and the present invention has been completed.

That is, the above-mentioned purpose is (A) 10 to 150 parts by mass of a thermoplastic resin other than the aromatic polycarbonate resin and (C) 0.01 to 1 part by mass of a thermal stabilizer with respect to 100 parts by mass of the aromatic polycarbonate resin. It is a manufacturing method of the aromatic polycarbonate resin composition which consists of the component containing a part, Comprising: As a thermoplastic resin other than (B) aromatic polycarbonate resin, it is 80-110 with respect to the apparent density of (A) aromatic polycarbonate resin. % of a thermoplastic resin other than the aromatic polycarbonate resin having an apparent density, (a) an aromatic polycarbonate resin and at least one of a thermoplastic resin other than (B) an aromatic polycarbonate resin, with a ground product, ( At least a thermoplastic resin other than A) aromatic polycarbonate resin and (B) aromatic polycarbonate resin The other particle size distribution satisfies the following (1) and (2):
(1) 2.0 mm on particle size is 10% or less
(2) Particle size of 1.68 mm pass is 50% or more . This is achieved by a method for producing an aromatic polycarbonate resin composition characterized by melt-kneading these components.

  ADVANTAGE OF THE INVENTION According to this invention, the aromatic polycarbonate resin composition excellent in quality stability can be provided.

Hereinafter, preferred and exemplary embodiments of the present invention will be specifically described.
The aromatic polycarbonate resin usable as the aromatic polycarbonate resin in the present invention is obtained by reacting an aromatic hydroxy compound (or an aromatic hydroxy compound and a small amount of a polyhydroxy compound) with phosgene or a diester of carbonic acid. It may be a thermoplastic aromatic polycarbonate polymer or copolymer. The method for producing the aromatic polycarbonate resin is not particularly limited, and may be a conventional method such as a phosgene method (interfacial polymerization method) or a melting method (transesterification method). Further, it may be an aromatic polycarbonate resin produced by a melting method and produced by adjusting the amount of terminal OH groups.

  As aromatic dihydroxy compounds usable in the present invention, 2,2-bis (4-hydroxyphenyl) propane (= bisphenol A), tetramethylbisphenol A, bis (4-hydroxyphenyl) -P-diisopropylbenzene, hydroquinone , Resorcinol, 4,4-dihydroxydiphenyl, etc., preferably bisphenol A.

  In order to obtain a branched aromatic polycarbonate resin, the following compounds may be used in place of a part of the aromatic dihydroxy compound. Specific examples of the compound include 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-hydroxyphenylheptene-3, 1,3,5-tri (4-hydroxyphenyl) benzene, 1,1,1-tri (4 -Hydroxyphenyl) ethane or the like, or 3,3-bis (4-hydroxyaryl) oxindole (= isatin bisphenol), 5-chloruisatin, 5,7-dichloroisatin, 5-bromoisatin and the like The amount of these compounds used is in the range of 0.01 to 10 mol%, preferably 0.1 to 2 mol%.

  The molecular weight of the aromatic polycarbonate resin is preferably in the range of 10,000 to 50,000 in terms of viscosity average molecular weight converted from the solution viscosity measured at a temperature of 25 ° C. using methylene chloride as the solvent. A range of 000 to 30,000 is more preferable, and a range of 17,500 to 27,000 is most preferable. If the viscosity average molecular weight is less than 10,000, the mechanical strength is inferior, and if it exceeds 50,000, the moldability is inferior.

There is no restriction | limiting in particular in thermoplastic resins other than the aromatic polycarbonate resin which can be used in this invention. For example, polyolefin resins such as polyethylene and polypropylene, polystyrene resins, polyvinyl chloride resins, poly (meth) acrylate resins, acrylic resins, polyacetal resins, polyethylene terephthalate, polybutylene terephthalate, polyester resins such as liquid crystalline polyester, Any known thermoplastic resin such as polyamide resin, polyphenylene ether resin, polyphenylene sulfide resin, polyimide resin, and thermoplastic elastomer can be used. These resins can be used alone or in combination of two or more.
Among such thermoplastic resins, polystyrene resins, polyethylene terephthalate, polybutylene terephthalate, polyester resins such as liquid crystalline polyester, and thermoplastic elastomers are preferable.

  Examples of the polystyrene resin preferably used include a homopolymer of a styrene monomer, a copolymer of styrene and (meth) acrylonitrile, and a copolymer of styrene monomer and (meth) acrylic acid alkyl ester. Copolymers, copolymers of styrene monomers, (meth) acrylonitrile and other copolymerizable monomers, styrene graft copolymers obtained by polymerizing styrene monomers in the presence of rubber components , And a graft copolymer obtained by graft polymerization of a styrene monomer and (meth) acrylonitrile in the presence of rubber, and specific examples include GPPS resin, AS resin, MS resin, AES resin, AAS resin, HIPS resin, ABS resin, MBS resin, etc. are mentioned. Examples of the method for producing a styrene copolymer in the present invention include known methods such as an emulsion polymerization method, a solution polymerization method, a suspension polymerization method, and a bulk polymerization method.

  The styrene / (meth) acrylonitrile copolymer is preferably a graft copolymer obtained by graft polymerization of at least a styrene monomer and (meth) acrylonitrile in the presence of a rubber component, and the presence of a rubber component. A styrene / (meta) comprising a graft copolymer obtained by polymerizing at least a styrene monomer and (meth) acrylonitrile and a copolymer obtained by polymerizing at least a styrene monomer and (meth) acrylonitrile. ) Acrylonitrile copolymer and the like.

  Examples of the styrene monomer include styrene, α-methyl styrene, p-methyl styrene, and preferably styrene. Examples of monomers copolymerizable with styrene monomers include (meth) acrylic acid alkyl esters such as methyl acrylate, ethyl acrylate, propyl acrylate, methyl methacrylate, and ethyl methacrylate, maleimide, N -Phenylmaleimide etc. are mentioned, Preferably, (meth) acrylic-acid alkylester is mentioned. As the monomer copolymerizable with the styrene monomer and (meth) acrylonitrile, the same monomers as those copolymerizable with the styrene monomer can be used.

As the rubber component, rubber having a glass transition temperature of 10 ° C. or less can be used. Specific examples of the rubber component include diene rubber, acrylic rubber, ethylene / propylene rubber, silicon rubber, and the like, and preferably, diene rubber and acrylic rubber.
Examples of the diene rubber include polybutadiene, butadiene / styrene copolymer, polyisoprene, lower alkyl ester copolymer of butadiene / (meth) acrylic acid, and lower alkyl ester copolymer of butadiene / styrene / (meth) acrylic acid. Examples include coalescence. Examples of the lower alkyl ester of (meth) acrylic acid include methyl acrylate, ethyl acrylate, methyl methacrylate, and ethyl methacrylate. The ratio of the lower alkyl ester of (meth) acrylic acid in the lower alkyl ester copolymer of butadiene / (meth) acrylic acid or the lower alkyl ester copolymer of butadiene / styrene / (meth) acrylic acid is based on the weight of the rubber component. It is preferable that it is 30 mass% or less.

  Examples of the acrylic rubber include acrylic acid alkyl ester rubber, and the alkyl group preferably has 1 to 8 carbon atoms. Specific examples of the alkyl acrylate rubber include ethyl acrylate, butyl acrylate, ethyl hexyl acrylate, and the like. In the acrylic acid alkyl ester rubber, a crosslinkable ethylenically unsaturated monomer may optionally be used. Examples of the crosslinking agent include alkylene diol, di (meth) acrylate, and polyester di (meth). Examples include acrylate, divinylbenzene, trivinylbenzene, triallyl cyanurate, allyl (meth) acrylate, butadiene, and isoprene. Examples of the acrylic rubber include a core-shell type polymer having a crosslinked diene rubber as a core.

  In the aromatic polycarbonate resin compound produced by the production method of the present invention, the ratio of the thermoplastic resin other than the aromatic polycarbonate resin is preferably 10 to 150 parts by mass with respect to 100 parts by mass of the aromatic polycarbonate resin. More preferably, it is -120 mass parts, and 30-100 mass parts is especially preferable.

  As described above, when the present invention produces a resin composition of an aromatic polycarbonate resin and a thermoplastic resin other than the aromatic polycarbonate resin, the apparent density of one resin is in a specific relationship with the apparent density of the other resin. And a pulverized product is used for at least one of the resins.

  Specifically, in the apparent density measured according to JIS K7365, the apparent density of the resin other than the aromatic polycarbonate resin is preferably 80% or more, particularly 90% or more with respect to the apparent density of the aromatic polycarbonate resin. And, it is preferably 110% or less, particularly preferably 105% or less. When the apparent density is less than 80% or exceeds 110%, the effect of suppressing the classification of the mixed material in the conveyance path (feeder, hopper chute) is reduced, and the variation in the composition ratio in the same batch is increased. As a result, it is not possible to sufficiently improve the problem of the prior art that the composition of each pellet varies when pelletized.

  In the present invention, either the aromatic polycarbonate resin or a thermoplastic resin other than the aromatic polycarbonate resin is a pulverized product. The pulverized product means a resin adjusted to a desired particle size by pulverization. The shape of the resin before pulverization is not particularly limited, but may be, for example, a pellet shape or a sheet shape. Moreover, there is no restriction | limiting in particular also in the grinding | pulverization method, For example, the common grinder which grind | pulverizes a material with a rotary blade can be used.

  Since the surface shape of the pulverized product is complicated, the surface area is large, and fine powders such as additives tend to adhere to the surface. Therefore, the effect that the ratio of the additive in the resin composition pellet is less likely to vary is obtained as compared with the case where a resin having high shape uniformity is used.

  A pulverized product may be used for either an aromatic polycarbonate resin or a thermoplastic resin other than an aromatic polycarbonate resin, but considering the dispersibility of powdered additives, etc., a resin with a large shape before pulverization is crushed. Are preferably used. For example, when a resin composition is manufactured and used from a flake-shaped resin and a pellet-shaped resin generally larger than the flake, the pellet-shaped resin composition is pulverized to satisfy the above apparent density relationship and It is preferable to do. Of course, a pulverized product may be used for both resins.

In the present invention, at least one of the particle size distributions of the aromatic polycarbonate resin and the thermoplastic resin other than the aromatic polycarbonate resin is a particle size distribution according to a screening test in accordance with JIS K0069. Preferably, it is 8% or less, more preferably 6% or less. Further, the particle size of the 1.68 mm pass is preferably 50% or more, and more preferably 55% or more.
By satisfying these ranges, classification of the mixed material in the conveyance path (feeder, hopper chute) can be suppressed, and variation in composition ratio within the same batch is reduced. As a result, the variation in composition from pellet to pellet when pelletized is also reduced.

(Heat stabilizer)
A heat stabilizer is used in the aromatic polycarbonate resin composition produced by the present invention. Content of a heat stabilizer is 0.001-1 mass part with respect to 100 mass parts of aromatic polycarbonate resin, Preferably 0.01-0.5 mass part is mix | blended. When the amount is less than 0.001 part by mass, the effect as a heat stabilizer is insufficient, and when it exceeds 1 part by mass, the hydrolysis resistance may deteriorate.

The heat stabilizer that can be used in the present invention is at least one selected from phosphorus stabilizers and phenolic antioxidants.
(Description of phosphorus stabilizer)
As a phosphorus stabilizer, a phosphite compound esterified with a phenol which may have an alkyl group having 1 to 25 carbon atoms, phosphorous acid or tetrakis (2,4-di-tert-butylphenyl) ) -4,4'-biphenylene-di-phosphonite is preferably used.

  Specific examples of the phosphite compound include trioctyl phosphite, tridecyl phosphite, triphenyl phosphite, trisnonylphenyl phosphite, tris (octylphenyl) phosphite, tris (2,4-di-tert- Butylphenyl) phosphite, tridecyl phosphite, didecyl monophenyl phosphite, dioctyl monophenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, distearyl Pentaerythritol diphosphite, diphenylpentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite 2,2-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, bis (nonylphenyl) pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol di Examples thereof include phosphite and bis (2,6-di-tert-butyl-4-ethylphenyl) pentaerythritol diphosphite.

  In particular, tris (2,4-di-tert-butylphenyl) phosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl) are preferred. -4-methylphenyl) pentaerythritol diphosphite or the like is used.

(Antioxidant)
In the present invention, an antioxidant can be further used as necessary. Although there is no restriction | limiting in particular in antioxidant, A hindered phenol type compound is used suitably. Representative examples include pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4- Hydroxyphenyl) propionate, thiodiethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], N, N′-hexane-1,6-diylbis [3- (3,5- Di-tert-butyl-4-hydroxyphenyl) propionamide], 2,4-dimethyl-6- (1-methylpentadecyl) phenol, diethyl [[3,5-bis (1,1-dimethylethyl) -4- Hydroxyphenyl] methyl] phosphoate, 3,3 ′, 3 ″, 5,5 ′, 5 ″ -hexa-tert-butyl-a, a ′, a ″-(mesithi Len-2,4,6-triyl) tri-p-cresol, 4,6-bis (octylthiomethyl) -o-cresol, ethylenebis (oxyethylene) bis [3- (5-tert-butyl-4- Hydroxy-m-tolyl) propionate], hexamethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 1,3,5-tris (3,5-di-tert- Butyl-4-hydroxybenzyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione, 2,6-di-tert-butyl-4- (4,6-bis ( Octylthio) -1,3,5-triazin-2-ylamino) phenol, 3,9-bis {2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyl Carboxymethyl] -1,1-dimethylethyl} -2,4,8,10-spiro [5,5] undecane.

  Of these, in particular pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4-hydroxy Phenyl) propionate, 3,9-bis {2- [3- (3-tert-butyl-4-hydroxy-2,) 5-methylphenyl] propionyloxy} 1,1-dimethylethyl-2,4 8,10-tetraoxaspiro [5,5] undecane is preferred.

  Content of antioxidant is 0.01-1 mass part with respect to 100 mass parts of aromatic polycarbonate resin, and 0.02-0.5 mass part is preferable. When the blending amount is less than 0.01 parts by mass, the effect as an antioxidant is insufficient, and even when added in excess of 1 part by mass, the effect as an antioxidant does not increase.

  In the present invention, a release agent, ultraviolet absorber, fluorescent brightener, pigment, dye, other polymer, flame retardant, impact resistance improver, antistatic agent, plasticizer, compatibilizer as necessary Such additives can be contained. These additives may be used alone or in combination of two or more.

(Release agent)
When a release agent is blended, those used for the aromatic polycarbonate resin such as at least one compound selected from aliphatic carboxylic acid, aliphatic carboxylic acid ester, and polysiloxane silicone oil are used. Among these, at least one selected from aliphatic carboxylic acids and aliphatic carboxylic acid esters is preferably used.

  As the aliphatic carboxylic acid, a mono- or dicarboxylic acid having 6 to 36 carbon atoms, particularly an aliphatic saturated monocarboxylic acid is preferable. Aliphatic carboxylic acids also include alicyclic carboxylic acids. As the aliphatic carboxylic acid component constituting the aliphatic carboxylic acid ester, the same aliphatic carboxylic acid as that described above can be used. On the other hand, the alcohol component constituting the aliphatic carboxylic acid ester is preferably a monovalent or polyvalent saturated alcohol having 30 or less carbon atoms, particularly an aliphatic saturated monohydric alcohol or polyhydric alcohol. Here, the aliphatic alcohol also includes an alicyclic alcohol.

  Content of a mold release agent is 2 mass parts or less with respect to 100 mass parts of aromatic polycarbonate resin, Preferably it is 1 mass part or less. When the amount exceeds 2 parts by mass, there are problems such as degradation of hydrolysis resistance and mold contamination during injection molding. One type of release agent can be used, but a plurality of release agents can be used in combination.

(UV absorber)
When blending an ultraviolet absorber, benzophenone, benzotriazole, phenyl salicylate, hindered amine, and the like can be blended.
Specific examples of the benzophenone-based ultraviolet absorber include 2,4-dihydroxy-benzophenone, 2-hydroxy-4-methoxy-benzophenone, 2-hydroxy-4-n-octoxy-benzophenone, and 2-hydroxy-4-dodecyloxy-benzophenone. 2-hydroxy-4-octadecyloxy-benzophenone, 2,2′-dihydroxy-4-methoxy-benzophenone, 2,2′-dihydroxy-4,4′-dimethoxy-benzophenone, 2,2 ′, 4,4 Examples include '-tetrahydroxy-benzophenone.

  Specific examples of the benzotriazole ultraviolet absorber include 2- (2′-hydroxy-5-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-ditertiarybutylphenyl) benzotriazole, 2- (2′-hydroxy-3′-tertiarybutyl-5′-methylphenyl) benzotriazole and the like.

  Specific examples of the phenyl salicylate ultraviolet absorber include phenylsaltylate, 2,4-ditertiarybutylphenyl-3,5-ditertiarybutyl-4-hydroxybenzoate, and the like. Specific examples of the hindered amine ultraviolet absorber include bis (2,2,6,6-tetramethylpiperidin-4-yl) sebacate.

  In addition to the four types of compounds listed above, ultraviolet absorbers contain compounds that have the function of converting the energy held by ultraviolet light into vibrational energy within the molecule and releasing the vibrational energy as thermal energy. It is. Further, a substance that exhibits a synergistic effect when used in combination with an antioxidant or a colorant, or a light stabilizer that acts as a light energy conversion agent, called a quencher, can be used in combination.

  Content of a ultraviolet absorber is chosen in the range of 0.01-2 mass parts with respect to 100 mass parts of aromatic polycarbonate resin. If the ultraviolet absorber is less than 0.01 parts by mass, the effect is insufficient. If it exceeds 2 parts by mass, the yellowness of the molded product becomes strong and the toning property is inferior. There is a tendency to be out easily. The preferable compounding quantity of a ultraviolet absorber is 0.05-1.5 mass part with respect to 100 mass parts of aromatic polycarbonate resin, More preferably, it is 0.1-1.0 mass part.

When producing the aromatic polycarbonate resin composition by melt-kneading the above components with an extruder,
Mixing of each component can be mix | blended in the arbitrary steps before thrown into an extruder. For example, after all components are blended by a tumbler, a Henschel mixer, and a blender, they may be fed into a hopper chute via a feeder and supplied to an extruder as necessary. As the extruder, a single screw extruder, a twin screw extruder or the like can be used.

EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to a following example, unless the summary is exceeded.
The raw materials used in the examples are as follows.
(A) Aromatic polycarbonate resin PC1: Aromatic polycarbonate resin (Iupilon (registered trademark) S-3000FN, manufactured by Mitsubishi Engineering Plastics), flakes obtained by the interfacial polymerization method, apparent density 0.565 g / cm ³ , repose Angle 37 °
(B) Thermoplastic resin other than aromatic polycarbonate resin ABS1: ABS resin (manufactured by Nippon A & L Co., Ltd., “trade name: Santac UT-61B”), pellets obtained by bulk polymerization, apparent density 0.679 g / cm ³ , angle of repose 25 °
ABS2: ABS1 Horai Co. pulverizer (BO-360) used, those treated with 130 kg / hr, an apparent density of 0.562 g / cm ^3, an angle of repose 42 °
Thermoplastic elastomer: Rohm & Haas “trade name: Paraloid EXL2603”, powder, apparent density 0.469 g / cm ³ , angle of repose 31 °
The apparent density was measured according to JIS K7365. The angle of repose was measured according to JIS R9301-2-2.
(C) Heat stabilizer: pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], “trade name: Irganox 1010” manufactured by Ciba, powder (D ) Mold release agent: Penlaerythritol distearate, manufactured by NOF Corporation "Product name: Unistar H476D", powder

Table 1 shows the particle size distribution of the aromatic polycarbonate resin and the thermoplastic resin other than the aromatic polycarbonate resin among the above components. The particle size distribution was measured according to JIS K0069.

The above components are collectively put into a container so as to have a total composition of 650 kg with the composition shown in Table 2, blended for 20 minutes, and then fed to a quantitative feeder. A 57 mm twin screw extruder (manufactured by Osaka Seiki Co., Ltd.) was kneaded at a barrel set temperature of 240 ° C. and extruded at 160 kg / h to produce a pellet-shaped aromatic polycarbonate resin composition.
The pellets were first sampled 5 minutes after the start of production, then sampled at 30-minute intervals, dried at 100 ° C. for 5 hours, and then injection molding machine SG75-Cycap MII (Sumitomo Heavy Industries, Ltd.) The test pieces were injection molded under the conditions of a cylinder temperature of 250 ° C., a mold temperature of 60 ° C. and a molding cycle of 1 minute, and the tensile elongation was evaluated.
Moreover, the variation of MVR and MVR was evaluated using the similarly sampled pellets.
Furthermore, the number of burnt foreign substances was evaluated using the obtained pellets.

(1) Tensile elongation and variation in tensile elongation: measured at n = 10 according to ISO 527, and calculated an average value and a standard deviation.
(2) MVR and MVR variation: measured at 250 ° C. under a load of 2160 g in accordance with ISO 1133. Average values and standard deviations were calculated for the obtained values.
(3) Number of burnt foreign matter 100 g of pellets sampled 3 hours after the start of production, dried at 100 ° C. for 5 hours using a hot air circulation dryer, and pressed into a disk shape having a diameter of about 20 mm under the condition of 260 ° C. 4 On both sides of a sheet (corresponding to 25 g per sheet), the number of foreign matters having a maximum length of 0.25 mm or more was visually counted. Table 2 shows the total number of foreign substances.

Table 2 shows the composition and evaluation results of Examples and Comparative Examples.

  As is apparent from Table 2, particularly the values of the variation in tensile elongation and the variation in MVR, according to the production method of the present invention, pellets having a stable composition can be produced regardless of the passage of time.

  Moreover, according to the manufacturing method of this invention, it turned out that the number of burnt foreign materials can also be reduced very much. This is because the pellet-shaped resin has a longer time to melt than the pulverized product, remains in the cylinder in an unmelted state and tends to be a source of burnt foreign matter, and remains in the cylinder in a relatively hard state until melted. It is considered that burned foreign substances are easily scraped off, but when the pulverized product is used, it melts quickly, so that it is difficult to cause burned foreign substances and the burned foreign substances are hardly scraped off.

Claims (7)

(A) It consists of components containing 10 to 150 parts by mass of thermoplastic resin other than aromatic polycarbonate resin and (C) 0.01 to 1 part by mass of thermal stabilizer for 100 parts by mass of aromatic polycarbonate resin. A method for producing an aromatic polycarbonate resin composition, comprising:
(B) As a thermoplastic resin other than the aromatic polycarbonate resin, a thermoplastic resin other than the aromatic polycarbonate resin having an apparent density of 80 to 110% with respect to the apparent density of the (A) aromatic polycarbonate resin is used.
Using at least one of (A) aromatic polycarbonate resin and (B) thermoplastic resin other than aromatic polycarbonate resin, a pulverized product is used,
The particle size distribution of at least one of (A) aromatic polycarbonate resin and (B) thermoplastic resin other than aromatic polycarbonate resin satisfies the following (1) and (2):
(1) 2.0 mm on particle size is 10% or less
(2) A method for producing an aromatic polycarbonate resin composition, comprising melting and kneading the above components with a particle size of 1.68 mm pass of 50% or more . (B) as the thermoplastic resin other than the aromatic polycarbonate resin, process for producing an aromatic polycarbonate resin composition of claim 1 which comprises using at least a styrene resin. (B) as the thermoplastic resin other than the aromatic polycarbonate resin, at least ABS (acrylonitrile - butadiene - styrene) based process for producing an aromatic polycarbonate resin composition according to claim 1 or 2, characterized by using a resin. The aromatic polycarbonate resin composition according to any one of claims 1 to 3 , wherein the pulverized product is produced by pulverizing a pellet-shaped product produced by a bulk polymerization method. Production method. To an aromatic polycarbonate resin (A) 100 parts by mass of further elastomer (D) 1 to 20 parts by weight aromatic polycarbonate resin composition according to any one of claims 1 to 4, characterized in that it contains Manufacturing method. The aromatic polycarbonate resin composition obtained with the manufacturing method of any one of Claims 1 thru | or 5 . An aromatic polycarbonate resin molded article obtained by molding the aromatic polycarbonate resin composition according to claim 6 .