JP2015096568A - Talc masterbatch and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a talc master batch by treating talc by a polycarbonate resin to be a master batch, capable of high concentration blending of talc, having no problem of degradation of the polycarbonate resin used for making master batch and excellent in its thermal stability, residence heat stability.SOLUTION: There is provided a master batch manufactured by melting and mixing a polycarbonate resin (A) and talc (B) by using a twin extruder and having percentage content of talc (B) of 5 to 60 pts.mass based on 100 pts.mass of the talc master batch and using granular talc manufactured by granulating talc particles having an average particle diameter of 0.1 to 10 μm to have bulk density of 0.4 to 1.5 g/ml.

Description

  The present invention relates to a talc masterbatch in which talc is masterbatched with a polycarbonate resin and a method for producing the talc, and in particular, high concentration blending of talc is possible, and there is no problem of deterioration of the polycarbonate resin used for masterbatch, The present invention relates to a talc masterbatch excellent in thermal stability and residence heat stability of the masterbatch itself and a method for producing the talc masterbatch.

  Polycarbonate resins, especially aromatic polycarbonate resins, are excellent in transparency, impact resistance, heat resistance, dimensional stability, etc. as general-purpose engineering plastics. Due to their excellent characteristics, electrical / electronic / OA equipment parts, machine parts, vehicles It is used in a wide range of parts such as industrial parts. Moreover, as a method for improving the rigidity and dimensional stability of the aromatic polycarbonate resin, an inorganic reinforcing material such as glass fiber or talc is contained.

Among these, talc is 1) good appearance can be obtained, 2) good balance between rigidity and impact, and 3) wear of molding machine screws and molds, compared with glass fiber generally used as an inorganic reinforcement. There is an advantage that there is little.
However, since talc itself has a strong alkaline property, when blended with a polycarbonate resin, there are problems in appearance such as a decrease in thermal stability and mechanical properties accompanying the decomposition of the resin and silver streak.

Conventionally, in order to solve the above-described problems caused by talc, the following studies have been made. However, in all cases, the effect of improving the thermal stability, particularly the retained thermal stability, was insufficient.
(1) Addition of specific phosphorus stabilizer (Patent Documents 1 and 2)
(2) Surface treatment of talc (Patent Document 3)
(3) Talc compression (Patent Documents 4 and 5)

  In addition, about the resin composition which mix | blended the granular talc which makes a masterbatch by this invention with aromatic polycarbonate resin, although patent document 6-8 has been proposed, in patent documents 6-8, granular talc is proposed. There is no technical idea of masterbatching.

JP-A-5-222283 JP-A-6-49343 JP-A-8-127711 JP-A-8-176339 JP-A-10-101914 JP 2007-238684 A Japanese Patent Laid-Open No. 2007-238685 JP 2007-314766 A

  The present invention is a talc masterbatch in which talc is masterbatched with a polycarbonate resin, which enables high-concentration blending of talc, and there is no problem of deterioration of the polycarbonate resin used for masterbatch formation. It is an object of the present invention to provide a talc masterbatch excellent in thermal stability and residence heat stability and a method for producing the talc masterbatch.

  In order to solve the problem of decomposition of the polycarbonate resin when the talc is blended with the polycarbonate resin, the present inventor tried to master the talc with the polycarbonate resin. Since the polycarbonate resin deteriorates in the process of conversion, it is difficult to make a masterbatch, and in particular, a masterbatch containing talc at a high concentration could not be obtained. Therefore, as a result of further studies on master batches of talc using polycarbonate resin, specific granular talc was used as talc, and this was melt kneaded while applying a strong shearing force using a twin screw extruder. The present inventors have found that a masterbatch can be formed using a polycarbonate resin, and a talc masterbatch containing talc at a high concentration can be produced without the problem of deterioration of the polycarbonate resin used for the masterbatch.

  The present invention has been achieved based on such findings, and the gist thereof is as follows.

[1] A talc master batch obtained by melt-kneading a polycarbonate resin (A) and talc (B) using a twin screw extruder, wherein the content of talc (B) in 100 parts by mass of the talc master batch is 5 to 60 parts by mass, and as talc (B), granular talc obtained by granulating talc particles having an average particle diameter of 0.1 to 10 μm to a bulk density of 0.4 to 1.5 g / ml was used. Characteristic talc masterbatch.

[2] In [1], the phosphorous heat stabilizer (C) is further contained, and the content ratio of the phosphorous heat stabilizer (C) in 100 parts by mass of the talc masterbatch is 0.02 to 3 parts by mass. Characteristic talc masterbatch.

[3] In [1] or [2], the phenol-based antioxidant (D) is further contained, and the content ratio of the phenol-based antioxidant (D) in 100 parts by mass of the talc masterbatch is 0.0001 to 3 parts by mass. Talc masterbatch characterized by being.

[4] In any one of [1] to [3], an organic phosphate compound (E) represented by the following general formula (1) is further included, and an organic phosphate compound (100 parts by mass) of talc masterbatch ( A content ratio of E) is 0.02 to 3 parts by mass.
(RO) _n P (O) (OH) _3-n (1)
(In the formula, R represents an alkyl group having 2 to 25 carbon atoms which may have a substituent, and n represents 1 or 2. However, when n is 2, two Rs are the same. May be different or different from each other.)

[5] In any one of [1] to [4], the granular talc is granulated using a binder, and the content of the binder in the granular talc is 0.01 to 5 mass. % Talc masterbatch characterized by%.

[6] The talc master batch according to any one of [1] to [5], wherein a ratio of the granular talc on the sieve having an opening of 500 μm is 55% by mass or more.

[7] A method for producing a masterbatch containing polycarbonate resin (A) and talc (B) by melt-kneading the polycarbonate resin (A) and talc (B) using a twin screw extruder. The talc (B) content in 100 parts by mass of the talc masterbatch is 5 to 60 parts by mass. As the talc (B), talc particles having an average particle size of 0.1 to 10 μm are added to a bulk density of 0.4 to The manufacturing method of the talc masterbatch characterized by using the granular talc granulated to 1.5 g / ml.

[8] In [7], further melt the phosphorus-based heat stabilizer (C) so that the content ratio of the phosphorus-based heat stabilizer (C) in 100 parts by mass of the talc masterbatch is 0.02 to 3 parts by mass. A method for producing a talc masterbatch characterized by kneading.

[9] In the above [7] or [8], the phenol-based antioxidant (D) is further melt-kneaded so that the content in 100 parts by mass of the talc masterbatch is 0.0001 to 3 parts by mass. A method for producing a talc masterbatch.

[10] In any one of [7] to [9], an organic phosphate compound (E) represented by the following general formula (1) is further added to an organic phosphate compound (E) in 100 parts by mass of talc masterbatch. ) Is produced by melt-kneading so that the content ratio is 0.02 to 3 parts by mass.
(RO) _n P (O) (OH) _3-n (1)
(In the formula, R represents an alkyl group having 2 to 25 carbon atoms which may have a substituent, and n represents 1 or 2. However, when n is 2, two Rs are the same. May be different or different from each other.)

[11] In any one of [7] to [10], the granular talc is granulated using a binder, and the content of the binder in the granular talc is 0.01 to 5 mass. %, The manufacturing method of the talc masterbatch characterized by the above-mentioned.

[12] The method for producing a talc masterbatch according to any one of [7] to [11], wherein the granular talc has a particle size of 55% by mass or more on a sieve having an opening of 500 μm.

According to the present invention, a talc masterbatch in which talc is masterbatched with a polycarbonate resin, which can be formulated with a high concentration of talc, has no problem of deterioration of the polycarbonate resin used for masterbatch, and is a masterbatch. A talc masterbatch excellent in its own thermal stability and residence heat stability is provided.
The talc masterbatch of the present invention can be used as an inorganic reinforcing material for various resins including polycarbonate resins such as aromatic polycarbonate resins, and the thermal stability and mechanical properties are reduced due to decomposition of the resin by talc. It is possible to improve appearance problems such as silver streak.

  Hereinafter, embodiments of the present invention will be described in detail. In the present specification, “to” is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.

[Polycarbonate resin (A)]
In the present invention, the polycarbonate resin (A) is used for masterbatch formation of talc (B).
Polycarbonate resin is a resin that is subject to deterioration by talc, but even if it is a polycarbonate resin that deteriorates by talc, by blending it into a polycarbonate resin composition or the like by making talc into a masterbatch, The attack property with respect to the polycarbonate resin can be reduced, and the appearance problems such as a decrease in thermal stability and mechanical properties due to the decomposition of the resin by talc and silver streak can be improved. Moreover, deterioration of the polycarbonate resin used for masterbatch formation by blending the phosphoric heat stabilizer (C), phenolic antioxidant (D) and organic phosphate ester compound (E) described later into the masterbatch. In addition, when the talc master batch is blended to prepare a composition, the presence of these components around the talc can also reduce talc attack.

  In the present invention, any conventionally known polycarbonate resin can be used as the polycarbonate resin (A) used for the master batch of talc (B). Examples of the polycarbonate resin (A) include aromatic polycarbonate resins, aliphatic polycarbonate resins, and aromatic-aliphatic polycarbonate resins, and aromatic polycarbonate resins are preferable.

  The aromatic polycarbonate resin is an optionally branched aromatic polycarbonate polymer obtained by reacting an aromatic hydroxy compound with a phosgene or carbonic acid diester. 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 a polycarbonate resin produced by a melting method and produced by adjusting the amount of OH groups of terminal groups.

Typical examples of the aromatic dihydroxy compound that is one of the raw materials of the aromatic polycarbonate resin used in the present invention include, for example, bis (4-hydroxyphenyl) methane and 2,2-bis (4-hydroxyphenyl). Propane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxy-3-tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3, 5-dimethylphenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 4,4-bis (4-hydroxyphenyl) heptane, 1,1-bis (4-hydroxyphenyl) Cyclohexane, 4,4′-dihydroxybiphenyl, 3,3 ′, 5,5′-tetramethyl-4,4′-dihydroxybiphenyl, bis (4- Hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) ether, bis (4-hydroxyphenyl) ketone and the like.
Furthermore, polyvalent phenols having three or more hydroxy groups in the molecule such as 1,1,1-tris (4-hydroxylphenyl) ethane (THPE), 1,3,5-tris (4-hydroxyphenyl) benzene Etc. can be used together in small amounts as a branching agent.
Among these aromatic dihydroxy compounds, 2,2-bis (4-hydroxyphenyl) propane (hereinafter also referred to as “bisphenol A” and sometimes abbreviated as “BPA”) is preferable. These aromatic dihydroxy compounds can be used alone or in admixture of two or more.

  In order to obtain a branched aromatic polycarbonate resin, phloroglucin, 4,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-2, 4,6-dimethyl-2,4,6-tris ( 4-hydroxyphenyl) heptane, 2,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-3, 1,3,5-tris (4-hydroxyphenyl) benzene, 1,1,1 -Polyhydroxy compounds such as tris (4-hydroxyphenyl) ethane, or 3,3-bis (4-hydroxyaryl) oxindole (= isatin bisphenol), 5-chloruisatin, 5,7-dichloroisatin, 5-bromoisatin, etc. May be used as a part of the aromatic dihydroxy compound, and the amount used thereof may be And from 0.01 to 10 mol% against, and preferably 0.1 to 2 mol%.

  In the polymerization by the transesterification method, a carbonic acid diester is used as a monomer instead of phosgene. Representative examples of the carbonic acid diester include substituted diaryl carbonates typified by diphenyl carbonate and ditolyl carbonate, and dialkyl carbonates typified by dimethyl carbonate, diethyl carbonate, di-tert-butyl carbonate and the like. These carbonic acid diesters can be used alone or in admixture of two or more. Among these, diphenyl carbonate (hereinafter sometimes abbreviated as “DPC”) and substituted diphenyl carbonate are preferable.

  Moreover, said carbonic acid diester may substitute the quantity of the 50 mol% or less preferably 30 mol% or less with the dicarboxylic acid or dicarboxylic acid ester preferably. Representative dicarboxylic acids or dicarboxylic acid esters include terephthalic acid, isophthalic acid, diphenyl terephthalate, and diphenyl isophthalate. When substituted with such a dicarboxylic acid or dicarboxylic acid ester, a polyester carbonate is obtained.

  When an aromatic polycarbonate resin is produced by a transesterification method, a catalyst is usually used. Although there is no limitation on the catalyst species, generally basic compounds such as alkali metal compounds, alkaline earth metal compounds, basic boron compounds, basic phosphorus compounds, basic ammonium compounds, and amine compounds are used. Of these, alkali metal compounds and / or alkaline earth metal compounds are particularly preferred. These may be used alone or in combination of two or more. In the transesterification method, the polymerization catalyst is generally deactivated with p-toluenesulfonic acid ester or the like.

  Preferred aromatic polycarbonate resins are polycarbonate resins derived from 2,2-bis (4-hydroxyphenyl) propane or derived from 2,2-bis (4-hydroxyphenyl) propane and other aromatic dihydroxy compounds. And polycarbonate copolymers. Further, for the purpose of imparting flame retardancy and the like, a polymer or oligomer having a siloxane structure can be copolymerized. The aromatic polycarbonate resin may be a mixture of two or more polymers and / or copolymers of different raw materials, and may have a branched structure up to 0.5 mol%.

  The terminal hydroxyl group content of the polycarbonate resin (A) has a great influence on the thermal stability, hydrolysis stability, color tone and the like of the masterbatch. In order to give practical physical properties, it is usually 30 to 2000 ppm, preferably 100 to 1500 ppm, more preferably 200 to 1000 ppm, and p-tert-butylphenol is used as a sealing end agent for adjusting the terminal hydroxyl group content. , Phenol, cumylphenol, p-long chain alkyl-substituted phenol, and the like can be used.

  As the amount of residual monomer in the polycarbonate resin (A), the aromatic dihydroxy compound is 150 ppm or less, preferably 100 ppm or less, and more preferably 50 ppm or less. When synthesized by the transesterification method, the residual amount of carbonic acid diester is 300 ppm or less, preferably 200 ppm or less, more preferably 150 ppm or less.

  The molecular weight of the polycarbonate resin (A) is a viscosity average molecular weight converted from the solution viscosity measured at a temperature of 20 ° C. using methylene chloride as a solvent, preferably in the range of 10,000 to 50,000. Preferably it is a thing of 10,000-40,000, Most preferably, it is a thing of the range of 12,000-30,000. By setting the viscosity average molecular weight to 10,000 or more, the mechanical properties are more effectively exhibited, and by setting the viscosity average molecular weight to 50,000 or less, the molding process becomes easier. Further, two or more kinds of polycarbonate resins having different viscosity average molecular weights may be mixed, or a polycarbonate resin having a viscosity average molecular weight outside the above preferred range may be mixed to be within the above molecular weight range.

[Talc (B)]
The talc (B) used in the present invention is a talc particle having an average particle diameter of 0.1 to 10 μm (hereinafter sometimes referred to as “raw material talc”) and a bulk density of 0.4 to 1.5 g / ml. It is a granular talc granulated to be. By using such granular talc as talc (B), the processability during the production of the masterbatch can be improved, and a masterbatch containing high-concentration talc can be produced. Deterioration of the resin (A) can be prevented and a good talc master batch can be obtained.

Talc is a hydrous magnesium silicate having a layered structure, the chemical formula is represented by _{4SiO 2 · 3MgO · H 2 O} , the normal SiO ₂ 58 to 66 wt%, the MgO 28 to 35 _{wt%, H} 2 O About 5% by mass. As other minor components, Fe ₂ O ₃ : 0.03 to 1.2% by mass, Al ₂ O ₃ : 0.05 to 1.5% by mass, CaO: 0.05 to 1.2% by mass, K ₂ O : 0.2% by mass or less, Na ₂ O: 0.2% by mass or less and the like, and the specific gravity is about 2.7.

The average particle size of the raw material talc used for granulation is 0.1 to 10 μm, and the average particle size of this raw material talc is preferably 0.3 to 8 μm, more preferably 0.7 to 5 μm. . When the average particle size is 0.1 μm or more, the thermal stability of the talc masterbatch and the resin composition containing the talc masterbatch tends to be improved, while the average particle size is 10 μm or less. The processability of the talc master batch and the appearance and rigidity of the molded product of the resin composition containing the talc master batch tend to be further improved. Here the average particle diameter refers to the D ₅₀ as measured in the liquid phase precipitation method using X-ray transmission. As an apparatus capable of performing such measurement, a Sedigraph particle size analyzer (“Model 5100” manufactured by Micromeritics Instruments) can be mentioned.

  The granular talc used as the talc (B) is preferably subjected to a surface treatment in order to enhance the affinity with the polycarbonate resin (A) and the resin blended with the talc masterbatch of the present invention. Examples of the surface treatment agent include alcohols such as trimethylolethane, trimethylolpropane and pentaerythritol, alkanolamines such as triethylamine, organosilicone compounds such as organopolysiloxane, higher fatty acids such as stearic acid, calcium stearate and stearin. Fatty acid metal salts such as magnesium acid, hydrocarbon lubricants such as polyethylene wax and liquid paraffin, basic amino acids such as lysine and arginine, polyglycerin and their derivatives, silane coupling agents, titanate coupling agents, aluminum There may be mentioned at least one selected from coupling agents such as coupling agents.

  The bulk density of the granular talc used as talc (B) is 0.4 to 1.5 g / ml, preferably 0.5 to 1.3 g / ml, particularly preferably 0.6 to 1.1 g / ml. It is. By setting the bulk density to 0.4 g / ml or more, the thermal stability and impact resistance of the talc masterbatch and the resin composition containing the talc masterbatch tend to be further improved. By making it 5 g / ml or less, the processability of the talc master batch and the appearance of the molded product and the impact resistance of the resin composition containing the talc master batch tend to be further improved.

Here, the bulk density is a value obtained by the following method.
(1) Place granular talc on a sieve with an opening of 1.4 mm, and pass the sieve while sweeping lightly with a brush.
(2) The granular talc passed through the sieve is put into a receiver attached to the bulk density measuring device specified in JISK5101 until it reaches a heap.
(3) Scrap off the granular talc that is piled up from the inlet of the receiver with a spatula, measure the weight of the granular talc in the receiver, and calculate the bulk density using the following equation.
Bulk density (g / ml) = weight of granular talc in the receiver (g) / capacity of receiver (ml)

  The particle size of the granular talc used as talc (B) is preferably 55% by mass or more, more preferably 60% by mass or more, still more preferably 70% by mass or more, particularly preferably as a ratio on a sieve having an opening of 500 μm. Is 90% by mass or more. In the granular particle size of the granular talc, the thermal stability of the talc masterbatch of the present invention and the resin composition containing the talc masterbatch is more improved because the ratio on the sieve having an opening of 500 μm is 55% by mass or more. It is in.

Here, the particle size of the granular talc is a value obtained by the following method in accordance with JISZ8801.
(1) Place granular talc on a sieve with an opening of 2 mm, and pass the sieve while sweeping lightly with a brush.
(2) Put the above granular talc passed through a sieve into a 200 ml beaker, and reduce it to about 30 ml using a sample reducer “13056” (groove width 6 mm) manufactured by Yoshida Seisakusho.
(3) The above-mentioned granular talc is sieved using a sieve having an opening of 500 μm, the weight of the granular talc that does not pass through the 500 μm sieve (on the sieve) is obtained, and the ratio to the total amount is obtained. In addition, sieving is carried out for 10 minutes at a frequency of 120 times / second using an “electromagnetic vibration sieve M-100 type” manufactured by Tsutsui Rika Kagakuki.

  The production method (granulation method) of granular talc is arbitrary, and any conventionally known granulation method can be used, but talc master batch and this talc master batch are obtained by granulating raw material talc using a binder. From the viewpoint of thermal stability, impact resistance, and rigidity of the resin composition containing the above.

  As the binder used when producing granular talc, the raw material talc is highly granulated, colorless or almost white, inert and stable substance, obtained by blending talc masterbatch and this talc masterbatch. What does not reduce the physical properties of the obtained resin composition is desirable. Specific examples include clay minerals such as bentonite that exhibit high caking properties under wet conditions, colloidal silica, gypsum, water-soluble polymers, waxes, higher fatty acids, and resin powders. Among these, clay minerals and water-soluble polymers are preferable from the viewpoint of thermal stability, impact resistance, and rigidity of the talc masterbatch and the resin composition, and water-soluble polymers are more preferable.

  Examples of the water-soluble polymer include polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, sodium polyacrylate, sodium alginate, agar, and polysaccharides (celluloses such as methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropulosecellulose, sodium carboxymethylcellulose) Derivatives, starch, etc.), proteins (gelatin, glue, etc.), dicarboxylic acid components composed of dicarboxylic acids or reactive derivatives thereof, diol components composed of diols or ester derivatives thereof, and water-solubilizing components. Examples thereof include water-soluble polyester copolymers obtained by using a raw material as a main component and subjecting them to a condensation reaction.

  Among these, water-soluble polyester copolymers having high affinity for resins and high adsorptivity with talc are more preferable, and preferred specific examples thereof include terephthalic acid, ethylene glycol, and 5-sodium sulfoisophthalic acid. And “Plus Coat Z-221”, “Plus Coat Z-561”, “Plus Coat Z-446”, etc. manufactured by Kyoyo Chemical Industry Co., Ltd., and the like.

  The binder content of granular talc used as talc (B) is preferably 0.01 to 5% by mass, more preferably 0.05 to 3.5% by mass, particularly preferably 100% by mass of granular talc. Is 0.1 to 2% by mass. By making the binder content 0.01% by mass or more, the granular talc is less likely to collapse, and the thermal stability and impact resistance of the talc masterbatch and the resin composition containing the talc masterbatch are more improved. On the other hand, by making the binder content 5% by mass or less, the polycarbonate resin (A) used for making the master batch of granular talc, and the dispersion in the resin composition containing the talc master batch are improved. Thus, the appearance and impact resistance of the molded article of the talc masterbatch and the resin composition tend to be further improved.

  The granulation method of the raw material talc is arbitrary, and there is no particular limitation, but the kneadability between the raw material talc and the binder is improved, and the kneaded product at the time of granule production is given plasticity to facilitate granulation. It is preferred to add a wetting agent to reduce machine wear and to adjust the hardness of the granules. Usually, a lubricant is added to the raw material talc and the binder, and if necessary, a dispersant and other additives are added to obtain a mixture while stirring with a mixer such as a Henschel mixer or a super mixer.

  This mixture is kneaded with a single-screw or twin-screw extruder, etc., extruded into strands, cut and granulated, and dried using a fluid dryer or band heater to produce granular talc. To do. After drying, classification is performed as necessary.

  The shape of the granular talc is not particularly limited, such as rod-like, cylindrical, needle-like, spherical, granular, flake-like, and irregular, and the size and shape of the granular talc is the same as that of the resin composition containing the talc masterbatch. Various products can be produced according to molding conditions and sizing conditions depending on the application. For example, when manufacturing rod-shaped or cylindrical granular talc, the shaft diameter can be appropriately set by changing the size of the screen opening of the screen-type extruder, and after shaping, the particles are sized and cut to the desired shaft length. be able to. The size of the granular talc is not particularly limited as long as the bulk density and particle size are within the above ranges, but the melt kneader is smaller than the resin pellet used for melt kneading and molding when blending the talc masterbatch. It is advantageous when dispersing with a molding machine. For example, in a rod-like or columnar granular talc, the average axial diameter is preferably 0.2 to 6 mm and the average axial length is preferably 2 to 6 mm, and the ratio of average axial diameter to average axial length is 1: 0.5. Those within the range of ˜2 are more preferred.

  Examples of the lubricant include water and organic solvents, but water is preferable from the viewpoint of cost and workability, and alcohols may be mixed with water. It is possible to dissolve or suspend the binder in water, which is a wetting agent. Additives required for granules, such as dispersants, surfactants, and various synthetic resin additives The uniformity can be further improved by dissolving or suspending the dye or pigment. Further, when water is used as the lubricant, after granulation, it is preferable to dry the moisture contained using a fluid dryer or the like so that the water content is 1% or less, more preferably 0.3. % Or less. 80-150 degreeC is suitable for drying temperature, Preferably it is 80-110 degreeC.

  The blending ratio of the lubricant is 10 to 150 parts by mass, preferably 15 to 100 parts by mass, and particularly preferably 20 to 60 parts by mass with respect to 100 parts by mass of the total of the raw material talc and the binder. If the blending ratio of the lubricant is less than 10 parts by mass, the effect is small, and if it exceeds 150 parts by mass, it takes too much time and energy to remove the lubricant.

  In the present invention, if the dispersant is added to the granular talc in an amount of 0.05 to 2.0% by mass, preferably 0.1 to 0.5% by mass, the granular talc polycarbonate resin (A) and the talc master batch are obtained. Since the dispersibility in the resin composition to mix | blend improves, it may be preferable. Dispersants used may be generally known, for example, alcohols, alkanolamines, organic silicone compounds, higher fatty acids, fatty acid metal salts, hydrocarbon lubricants, basic amino acids, polyglycerols and their derivatives as described above. Can be mentioned. In this invention, 1 type, or 2 or more types chosen from these can be used, You may granulate using the raw material talc which performed the above-mentioned surface treatment, and also adding a dispersing agent.

  Furthermore, in the granular talc used in the present invention, various additives may be blended in addition to the dispersant, as long as the characteristics of the present invention are not impaired. Specific examples of such additives include various antioxidants such as hindered phenols, various heat stabilizers such as phosphites, various ultraviolet absorbers such as benzotriazoles, benzophenones, and triazines, and phosphoric acid. Various flame retardants such as ester, silicone and metal salt, various release agents such as olefin wax and fatty acid ester, antibacterial and antifungal agents such as phenol, anionic, cationic and nonionic Antistatic agents, colorants, fillers other than talc, light stabilizers, plasticizers, foaming agents and the like can be mentioned. A plurality of these additives can be blended.

[Phosphorus heat stabilizer (C)]
The talc masterbatch of the present invention may contain a phosphorus heat stabilizer (C). The phosphorus-based heat stabilizer (C) is effective for improving the residence stability under high temperature conditions in the melt-kneading step during the production of the master batch and the heat stability of the master batch.

  Examples of the phosphorus-based heat stabilizer (C) used in the present invention include phosphorous acid, phosphoric acid, phosphite ester, and phosphate ester (excluding the organic phosphate ester compound (E) described later). Among them, phosphites such as phosphites and phosphonites are preferable in that they contain trivalent phosphorus and easily exhibit a discoloration suppressing effect.

  Examples of the phosphite include triphenyl phosphite, tris (nonylphenyl) phosphite, dilauryl hydrogen phosphite, triethyl phosphite, tridecyl phosphite, tris (2-ethylhexyl) phosphite, tris (tridecyl) phosphite. Phyto, tristearyl phosphite, diphenyl monodecyl phosphite, monophenyl didecyl phosphite, diphenyl mono (tridecyl) phosphite, tetraphenyldipropylene glycol diphosphite, tetraphenyltetra (tridecyl) pentaerythritol tetraphosphite, water Bisphenol A phenol phosphite polymer, diphenyl hydrogen phosphite, 4,4′-butylidene-bis (3-methyl-6-tert-butyl) Ruphenyldi (tridecyl) phosphite) tetra (tridecyl) 4,4'-isopropylidenediphenyldiphosphite, bis (tridecyl) pentaerythritol diphosphite, bis (nonylphenyl) pentaerythritol diphosphite, dilaurylpentaerythritol diphos Phyto, distearyl pentaerythritol diphosphite, tris (4-tert-butylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, hydrogenated bisphenol A pentaerythritol phosphite polymer, bis ( 2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, , 2'-methylenebis (4,6-di -tert- butylphenyl) octyl phosphite, bis (2,4-dicumylphenyl) pentaerythritol diphosphite and the like.

  Examples of phosphonites include tetrakis (2,4-di-iso-propylphenyl) -4,4′-biphenylenediphosphonite, tetrakis (2,4-di-n-butylphenyl) -4,4′-biphenyl. Range phosphonite, tetrakis (2,4-di-tert-butylphenyl) -4,4'-biphenylene diphosphonite, tetrakis (2,4-di-tert-butylphenyl) -4,3'-biphenylene diphospho Knight, tetrakis (2,4-di-tert-butylphenyl) -3,3'-biphenylenediphosphonite, tetrakis (2,6-di-iso-propylphenyl) -4,4'-biphenylenediphosphonite, Tetrakis (2,6-di-n-butylphenyl) -4,4′-biphenylenediphosphonite, tetrakis (2,6- -Tert-butylphenyl) -4,4'-biphenylenediphosphonite, tetrakis (2,6-di-tert-butylphenyl) -4,3'-biphenylenediphosphonite, tetrakis (2,6-di-tert) -Butylphenyl) -3,3'-biphenylenediphosphonite and the like.

  Among the phosphites, distearyl pentaerythritol diphosphite, tris (2,4-di-tert-butylphenyl) phosphite, bis (2,6-di-tert-butyl-4-methylphenyl) penta Erythritol diphosphite, 2,2′-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, bis (2,4-dicumylphenyl) pentaerythritol diphosphite are preferable, and heat resistance is good. Tris (2,4-di-tert-butylphenyl) phosphite is particularly preferred in that it is difficult to hydrolyze.

  These phosphorus heat stabilizers (C) may be used alone or in combination of two or more.

[Phenolic antioxidant (D)]
The talc masterbatch of the present invention may contain a phenolic antioxidant (D), and by containing a phenolic antioxidant (D), it is a machine due to hue deterioration or oxidative deterioration during heat retention. Decrease in physical properties can be suppressed.

  Examples of the phenolic antioxidant (D) include hindered phenolic antioxidants. Specific examples thereof 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-hydroxyphenylpropionamide), 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 ′, ''-(Mesitylene-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 and the like.

  Among them, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate preferable. Examples of such commercially available phenolic antioxidants include “Irganox 1010”, “Irganox 1076” manufactured by BASF, “Adekastab AO-60”, “Adekastab AO-50” manufactured by ADEKA, and the like. It is done.

  One of these phenolic antioxidants (D) may be contained, or two or more thereof may be contained in any combination and ratio.

[Organic Phosphate Compound (E)]
The talc masterbatch of the present invention may further contain an organic phosphate compound (E) represented by the following general formula (1), and the organic phosphate compound (E) is an impurity in talc. By deactivating heavy metal components such as iron contained, deterioration of the polycarbonate resin (A) due to these components can be prevented, and also in a resin composition containing a talc masterbatch, the same mechanism of action. It is possible to further enhance the thermal stability of the resin, such as the melting heat stability and the residence heat stability.
(RO) _n P (O) (OH) _3-n (1)
(In the formula, R represents an alkyl group having 2 to 25 carbon atoms which may have a substituent, and n represents 1 or 2. However, when n is 2, two Rs are the same. May be different or different from each other.)

  As the unsubstituted alkyl group represented by R, octyl group, 2-ethylhexyl group, isooctyl group, nonyl group, isononyl group, decyl group, isodecyl group, dodecyl group, tridecyl group, isotridecyl group, tetradecyl group, hexadecyl group, octadecyl group Group and stearyl group. Examples of the alkyl group having a substituent include those in which a chain hydrocarbon group such as a butyl group, an allyl group, or a methallyl group is bonded to the alkyl group by an ether bond or an ester bond. R is preferably an alkyl group having these substituents. Moreover, it is preferable that the total carbon number in R including the carbon of a substituent is 5 or more.

  The organic phosphate compound (E) may be a mixture of compounds having different R and n in the general formula (1).

[Other ingredients]
The talc masterbatch of the present invention comprises polycarbonate resin (A) and talc (B), or polycarbonate resin (A), talc (B), phosphorus-based heat stabilizer (C), and phenol-based antioxidant (D). And one or more of the organic phosphate compounds (E) are produced by melt-kneading with a twin-screw extruder, and if necessary, the polycarbonate resin (A ), Talc (B), phosphorus heat stabilizer (C), phenolic antioxidant (D), and organic phosphate ester compound (E) may be further blended and melt-kneaded.
Other components include heat stabilizers other than phosphorus heat stabilizers (C), antioxidants other than phenolic antioxidants (D), ultraviolet absorbers, flame retardants, antistatic agents, pigments, dyes, and the like. Can be mentioned.

[Content ratio of each component]
In the talc masterbatch of the present invention, the content of talc (B) in 100 parts by mass of the talc masterbatch is 5 to 60 parts by mass, preferably 15 to 60 parts by mass, and more preferably 30 to 60 parts by mass. .
That is, according to the present invention, the above-mentioned granular talc is used as the talc (B) and melt kneading with a twin screw extruder enables high blending of the talc (B). A high-concentration talc masterbatch such as preferably 15 to 60% by mass, more preferably 30 to 60% by mass can be produced.

  When the content ratio of talc (B) in the talc master batch is less than the above lower limit, the blending efficiency of talc as the talc master batch is poor. When the content ratio of talc (B) in the talc masterbatch exceeds the above upper limit, the amount of the polycarbonate resin (A) serving as a binder becomes relatively small and it becomes difficult to form a masterbatch.

  Moreover, when the talc masterbatch of this invention contains a phosphorus heat stabilizer (C), the content rate of the phosphorus heat stabilizer (C) in 100 mass parts of talc masterbatches becomes like this normally normally 0.02-3. Parts by mass, more preferably 0.03 to 1 parts by mass, particularly preferably 0.04 to 0.5 parts by mass. If the content of the phosphorus-based heat stabilizer (C) in the talc masterbatch is less than the lower limit of the above range, the heat-stabilizing effect may be insufficient, and the content of the phosphorus-based heat stabilizer (C) If the amount exceeds the upper limit of the above range, the effect may reach its peak and not economical.

  Moreover, when the talc masterbatch of this invention contains a phenolic antioxidant (D), Preferably the content rate of the phenolic antioxidant (D) in 100 mass parts of talc masterbatch is usually 0.02-3. Parts by mass, more preferably 0.03 to 1 parts by mass, particularly preferably 0.04 to 0.5 parts by mass. When the content of the phenolic antioxidant (D) in the talc masterbatch is less than the lower limit of the above range, the effect as an antioxidant may be insufficient, and the phenolic antioxidant (D When the content of) exceeds the upper limit of the above range, the effect may reach its peak and may not be economical.

  In particular, the talc masterbatch of the present invention contains both the phosphorus-based heat stabilizer (C) and the phenol-based antioxidant (D), so that the improvement effect of each component can be obtained synergistically. Preferably, in this case, the phosphorus-based heat stabilizer (C) and the phenol-based antioxidant (D) are combined with the phosphorus-based heat stabilizer (C): phenol-based antioxidant (D) = 1: 0.2-3. It is preferable to contain 0.1-2 mass parts in 100 mass parts of talc masterbatch as a total amount by mass ratio.

  Moreover, when the talc masterbatch of this invention contains an organic phosphate ester compound (E), content of the organic phosphate ester compound (E) in 100 mass parts of talc masterbatch is 0.02-3 mass parts. It is preferable that the ratio is 0.05 to 2 parts by mass, particularly preferably 0.1 to 1 part by mass. When the content of the organic phosphate compound (E) in the talc masterbatch is less than the above lower limit, the effect of improving the thermal stability by blending the organic phosphate compound (E) can be sufficiently obtained. However, even if the amount is larger than the above upper limit, the effect of improving the thermal stability reaches its peak and is not preferable in terms of economy.

  The talc masterbatch of the present invention contains other components other than the polycarbonate resin (A), talc (B), phosphorous heat stabilizer (C), phenolic antioxidant (D) and organophosphate ester compound (E). It is preferable that the talc masterbatch of the present invention contains 40% by mass or more, particularly about 40 to 70% by mass, of the polycarbonate resin (A) serving as a binder for talc (B), including the case where it is contained.

[Melting and kneading]
The talc masterbatch of the present invention comprises polycarbonate resin (A) and talc (B), or polycarbonate resin (A) and talc (B), a phosphorous heat stabilizer (C), a phenolic antioxidant (D) and It is produced through a step of melt-kneading one or more of the organic phosphate ester compound (E) and further, if necessary, other components using a twin screw extruder. Here, it is an important requirement to use a twin-screw extruder instead of a single-screw (single-screw) extruder. With a single-screw extruder, feedability is poor and stable strands cannot be extruded. It is difficult to batch. On the other hand, it is possible to stably manufacture even a talc masterbatch with a high talc composition by applying a strong shearing force and melt-kneading using a twin screw extruder.

As melt-kneading conditions by a twin-screw extruder, conditions of a cylinder temperature of 260 to 300 ° C. and a screw rotation speed of about 100 to 300 rpm can be employed.
The strand extruded from the twin-screw extruder can be cooled in a water tank or the like according to a conventional method and then pelletized using a pelletizer to obtain the talc masterbatch of the present invention.

  The shape and size of the talc masterbatch of the present invention produced in this way are not particularly limited, but usually the major axis is 2.5 to 3.5 mm in average and the minor axis is 1.5 in average. A columnar shape, a granular shape, and a disk shape of about ~ 2.5 mm. Here, the major axis is the length of the part where the distance between the plates becomes the longest when the talc masterbatch is sandwiched between two parallel plates, and the minor axis is the shortest distance. The length of the part. For example, when the talc master batch is columnar, the minor axis is the axial diameter, and the major axis is the axial length.

[Usage]
The talc masterbatch of the present invention can be used by being blended with various thermoplastic resins as an inorganic reinforcing material, and particularly suitably used for a polycarbonate resin composition, a polycarbonate / polyester resin composition, and a polycarbonate / ABS resin composition. be able to.

EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example, unless the summary is exceeded.
The raw material components used in the following examples and comparative examples are as follows.

[Polycarbonate resin]
<Polycarbonate resin-A>
"Iupilon (registered trademark) E-2000" manufactured by Mitsubishi Engineering Plastics
Bisphenol A-type aromatic polycarbonate resin produced by interfacial polymerization Viscosity average molecular weight: 28,000
<Polycarbonate resin-B>
"Iupilon (registered trademark) S-3000" manufactured by Mitsubishi Engineering Plastics
Bisphenol A-type aromatic polycarbonate resin produced by interfacial polymerization Viscosity average molecular weight: 22,000
<Polycarbonate resin-C>
"Iupilon (registered trademark) H-4000" manufactured by Mitsubishi Engineering Plastics
Bisphenol A type aromatic polycarbonate resin produced by interfacial polymerization Viscosity average molecular weight: 16,000
<Polycarbonate resin-D>
"Novalex (registered trademark) M7027BF" manufactured by Mitsubishi Engineering Plastics
Bisphenol A type aromatic polycarbonate resin produced by melt polymerization method Viscosity average molecular weight: 26,000

[talc]
<Granular Talc-A>
Granular talc “R-10 (trade name)” manufactured by Matsumura Sangyo Co., Ltd.
Raw material talc average particle size = 1.8μm
Granular talc shape = columnar
Average shaft diameter = 1.2mm
Average axial length = 1.5mm
Bulk density = 0.76 g / ml
Particle size (ratio on sieve with 500 μm openings) = 98% by mass
Binder type = Water-soluble polyester ("Plus"
Coat Z-221 ")
Granular talc binder content = 1% by mass

<Granular Talc-B>
Matsumura Sangyo Co., Ltd. Granule talc binder content "C-12 (trade name)"
Raw material talc average particle size = 1.8μm
Granular talc shape = columnar
Average shaft diameter = 1.2mm
Average axial length = 1.5mm
Bulk density = 0.74 g / ml
Particle size (ratio on sieve with 500 μm openings) = 98% by mass
Binder type = CMC (“Serogen 7A” manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
Binder content of granular talc = 0.3% by mass

<Comparison talc-A>
Talc "High filler 5000PJ" manufactured by Matsumura Sangyo Co., Ltd.
Talc particles with an average particle size of 1.8μm

<Comparison talc-B>
Compression talc "HS-T0.8" made by Hayashi Kasei
Compress talc particles with an average particle size of 2.0μm without using a binder
What
Bulk density = 0.80 g / ml
Particle size (ratio on sieve with 500 μm openings) = 32% by mass

[Organic phosphate compounds]
<Organic Phosphate Ester Compound-1>
"ADEKA STAB AX-71" manufactured by ADEKA
Mono-, di-stearyl acid _{phosphate: (C 18 H 37 O)} n P (O) (OH) 3-n ( a mixture of n = 1 and 2)
<Organic phosphate ester compound-2>
"JP-506H" manufactured by Johoku Chemical Industry Co., Ltd.
Butoxyethyl acid _{phosphate: (C 4 H 9 OC 2} H 4 O) n P (O) (OH) 3-n ( a mixture of n = 1 and 2)

[Phosphorus heat stabilizer]
Phosphorus heat stabilizer-1: “AS2112” manufactured by ADEKA
Tris (2,4-di-tert-butylphenyl) phosphite

[Phenolic antioxidant]
Phenolic antioxidant-1: “ADEKA STAB AO-50” manufactured by ADEKA
Octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate

[Examples 1-8 and Comparative Examples 1-5]
After each component shown in Tables 1-2 is uniformly mixed with a tumbler-mixer at the ratio shown in the table, a twin screw extruder: “TEX30XCT” manufactured by Nippon Steel Works, cylinder temperature is 280 ° C., The resin composition is extruded into strands by melt-kneading at a screw speed of 300 rpm, cooled in a water tank, and pelletized into a columnar shape having an average shaft diameter of 2.0 mm and an average shaft length of 3,0 mm using a pelletizer. The talc masterbatch was obtained.

[Comparative Examples 6 and 7]
After each component shown in Table 2 was uniformly mixed with a tumbler-mixer at the ratio shown in the same table, a single-screw extruder: “VS-40” manufactured by Tanabe Seisakusho was used, cylinder temperature was 280 ° C., screw A talc masterbatch was obtained in the same manner as in Example 1 except that the resin composition was extruded into a strand by melt-kneading at a rotational speed of 100 rpm.

[Evaluation of talc masterbatch]
The following evaluation was performed about the talc masterbatch obtained in Examples 1-8 and Comparative Examples 1-7, and the result was shown to Tables 1-2.

(1) Workability at the time of master batch production The workability at the time of master batch production was evaluated in the following four stages.
◎: Manufacturable without any problems ○: Sometimes strand breaks, but manufacturable △: Inferior to feedability and strand stability, difficult to manufacture ×: Remarkably inferior to feedability and strand stability, unmanufacturable

(2) Hue The hue of the talc masterbatch was measured using a color difference meter (SE-2000) manufactured by Nippon Denshoku.

(3) MVR and retention MVR
With respect to the talc masterbatch, normal MVR (melt volume rate) was measured in accordance with ISO 1133 (normal MVR). The measurement temperature was 300 ° C. and the load was 2.16 kg. Further, the MVR was measured in the same manner when the sample was retained for 12 minutes in the cylinder of the measuring machine (residual MVR). ΔMVR was determined by the following formula.
ΔMVR = Still MVR−Normal MVR

From Tables 1 and 2, the following is clear.
Of Comparative Examples 1 and 2 using non-granulated talc particles instead of granular talc, in Comparative Example 1 containing a small amount of talc of about 20 parts by mass, it is difficult to make a masterbatch, and 50 mass In Comparative Example 2 in which some parts were blended, a master batch could not be formed.
Similar results are obtained in Comparative Examples 3 and 4 using compressed talc. This is considered to be due to the fact that compressed talc is simply compressed talc and disintegrates early in the melt-kneading process in an extruder and behaves like normal talc particles.
Further, in Comparative Examples 6 and 7 using a single screw extruder instead of a twin screw extruder, it is difficult to make a masterbatch even if granular talc is used. become unable.

  On the other hand, in Examples 1 to 8 in which granular talc was used and melt-kneaded with a twin-screw extruder, it was possible to form a master batch under good workability, and the obtained talc master The hue of the batch is good, and the MVR and ΔMVR are usually low, indicating that there is no problem of deterioration of the polycarbonate resin. In particular, in Examples 3 to 5, 7 and 8 in which the phosphorus-based heat stabilizer (C) and the phenol-based antioxidant (D) are used in combination, Example 1 using only the phosphorus-based heat stabilizer (C) Compared with 2 and 6, ΔMVR is kept low, which is effective for thermal stability during residence.

Claims (12)

A talc masterbatch obtained by melt-kneading a polycarbonate resin (A) and talc (B) using a twin screw extruder,
The content ratio of talc (B) in 100 parts by mass of the talc masterbatch is 5 to 60 parts by mass,
A talc masterbatch characterized in that granular talc obtained by granulating talc particles having an average particle diameter of 0.1 to 10 μm to a bulk density of 0.4 to 1.5 g / ml is used as the talc (B).   The phosphorous heat stabilizer (C) is further contained in claim 1, and the content ratio of the phosphorous heat stabilizer (C) in 100 parts by mass of the talc masterbatch is 0.02 to 3 parts by mass. Talc masterbatch.   The phenolic antioxidant (D) is further contained in claim 1 or 2, and the content ratio of the phenolic antioxidant (D) in 100 parts by mass of the talc masterbatch is 0.02 to 3 parts by mass. Talc master batch. In any 1 item | term of Claims 1 thru | or 3, the organic phosphate ester compound (E) represented by the following general formula (1) is further included of the organic phosphate ester compound (E) in 100 mass parts of talc masterbatch. Content ratio is 0.02-3 mass parts, The talc masterbatch characterized by the above-mentioned.
(RO) _n P (O) (OH) _3-n (1)
(In the formula, R represents an alkyl group having 2 to 25 carbon atoms which may have a substituent, and n represents 1 or 2. However, when n is 2, two Rs are the same. May be different or different from each other.)   In any 1 item | term of the Claims 1 thru | or 4, the said granular talc is granulated using the binder, Content of the binder in granular talc is 0.01-5 mass%. Talc masterbatch characterized by that.   The talc masterbatch according to any one of claims 1 to 5, wherein a proportion of the granular talc on a sieve having an opening of 500 µm is 55% by mass or more. A method for producing a masterbatch containing polycarbonate resin (A) and talc (B) by melt-kneading polycarbonate resin (A) and talc (B) using a twin screw extruder,
The blending ratio of talc (B) in 100 parts by mass of the talc masterbatch is 5 to 60 parts by mass,
As the talc (B), a granular talc obtained by granulating talc particles having an average particle diameter of 0.1 to 10 μm to a bulk density of 0.4 to 1.5 g / ml is used. .   In Claim 7, melt-kneading a phosphorus thermal stabilizer (C) so that the content rate of the phosphorus thermal stabilizer (C) in 100 mass parts of talc masterbatches may be 0.02-3 mass parts. A method for producing a talc masterbatch characterized by the above.   The talc masterbatch according to claim 7 or 8, wherein the phenolic antioxidant (D) is further melt-kneaded so that the content ratio in 100 parts by mass of the talc masterbatch is 0.0001 to 3 parts by mass. Manufacturing method. The organic phosphate ester compound (E) represented by the following general formula (1) according to any one of claims 7 to 9, wherein the organic phosphate ester compound (E) is contained in 100 parts by mass of a talc masterbatch. A method for producing a talc masterbatch, which comprises melt-kneading so that the ratio is 0.02 to 3 parts by mass.
(RO) _n P (O) (OH) _3-n (1)
(In the formula, R represents an alkyl group having 2 to 25 carbon atoms which may have a substituent, and n represents 1 or 2. However, when n is 2, two Rs are the same. May be different or different from each other.)   11. The granular talc according to any one of claims 7 to 10, wherein the granular talc is granulated using a binder, and the content of the binder in the granular talc is 0.01 to 5% by mass. A method for producing a talc masterbatch characterized by the above.   The method for producing a talc masterbatch according to any one of claims 7 to 11, wherein a proportion of the granular talc on a sieve having an opening of 500 µm is 55% by mass or more.