Abstract: Described herein are polyphenylene sulfide (“PPS”) polymers having excellent transparency to infrared (“IR”) radiation. It was surprisingly discovered that PPS polymer composition including PPS polymers having a selected metal ion (Ca, K, and Mg) concentration at least 400 parts per million by weight (“ppm”), had significantly increase IR transparency, relative to corresponding PPS polymer compositions including a PPS polymer having a selected metal ion concentration less than 400 ppm. Additionally, described herein are methods for laser welding the PPS polymer compositions.

Abstract: The present disclosure relates to a method of more efficiently separating and purifying a polyarylene sulfide exhibiting excellent strength, heat resistance, flame retardancy, and processability when processed into a molded product after polymerization.

Abstract: The present disclosure relates to a method of more efficiently separating and recovering a polyarylene sulfide exhibiting excellent strength, heat resistance, flame retardancy, and processability when processed into a molded product after polymerization.

Abstract: A method of producing a PAS according to an embodiment of the present invention includes: a polymerizing step; a water removal step; a hydrogen sulfide recovering step in which hydrogen sulfide contained in a gas component produced in the water removal step is absorbed and recovered by an aqueous solution of an alkali metal hydroxide; and a condensation step in which the gas component produced in the water removal step is condensed. The hydrogen sulfide recovering step is performed before the condensation step.

Abstract: The present disclosure relates to a preparation method of a polyarylene sulfide, and this method may produce a polyarylene sulfide having properties equal to or higher than those of the conventional method at a high yield by adding an acidic compound in addition to existing materials for dehydration.

Abstract: The present invention relates to a method of preparing a polyphenylene sulfide and a high-viscosity polyphenylene sulfide prepared using the method. In this method, the ratio of an organic phase to an aqueous phase is controlled by controlling dehydration conditions, so that high viscosity may be realized without adversely affecting a reaction or physical properties during preparation of the polyphenylene sulfide.

Abstract: The present invention relates to a polyarylene sulfide having more improved miscibility with other polymer materials or fillers, and a method of preparing the same. At least part of end groups of the main chain of the polyarylene sulfide is carboxyl group (—COOH) or amine group (—NH2).

Abstract: Provided is a continuous production apparatus and a continuous production method capable of preventing the countercurrent of evaporation components generated at the time of polymerization so that continuous solution polymerization reactions can progress reliably. A continuous production apparatus (100) includes a housing chamber (2) configured to house a plurality of reaction vessels (1a to 1d); wherein a reaction mixture is formed by subjecting monomers to a polymerization reaction in a solvent in at least one of the reaction vessels; the reaction vessels communicate with one another via a gas phase part (4); the reaction vessels are sequentially connected; the reaction mixture successively moves to each of the reaction vessels; and the housing chamber includes a baffle (9) configured to narrow the cross-sectional area of the gas phase part at the boundary between at least one pair of adjacent reaction vessels or in the vicinity of the boundary.

Abstract: Provided is a continuous production apparatus and a continuous production method capable of preventing the countercurrent of evaporation components generated at the time of polymerization so that continuous solution polymerization reactions can progress reliably. A continuous production apparatus (100) includes a housing chamber (2) configured to house a plurality of reaction vessels (1a to 1d); wherein a reaction mixture is formed by subjecting monomers to a polymerization reaction in a solvent in at least one of the reaction vessels; the reaction vessels communicate with one another via a gas phase part (4); the reaction vessels are sequentially connected; the reaction mixture successively moves to each of the reaction vessels; and the housing chamber includes a baffle (9) configured to narrow the cross-sectional area of the gas phase part at the boundary between at least one pair of adjacent reaction vessels or in the vicinity of the boundary.

Abstract: The present invention is to provide a method that can produce polyarylene sulfide having a high viscosity at a high yield. The method of producing polyarylene sulfide according to an embodiment of the present invention includes: a preparation step of preparing a mixture containing an organic amide solvent, a sulfur source, a dihalo aromatic compound, and an alkali metal hydroxide; a first-stage polymerization step of initiating a polymerization reaction by heating the mixture and producing a prepolymer until a pH of a reaction system reaches a range of 10 to 11; and a second-stage polymerization step of continuing the polymerization reaction.

Abstract: The present invention is to provide a method of producing polyarylene sulfide that can produce polyarylene sulfide having a low halogen content simply and easily and at low cost. The method of producing polyarylene sulfide according to an embodiment of the present invention includes: a preparation step of preparing a mixture containing an organic amide solvent, a sulfur source, a dihalo aromatic compound, and an alkali metal hydroxide; a first-stage polymerization step of producing a prepolymer until a pH of a reaction system reaches a range of lower than 10 but 7 or higher by initiating a polymerization reaction by heating the mixture; and a second-stage polymerization step of continuing the polymerization reaction.

Abstract: The present invention is to provide a method of producing highly pure polyarylene sulfide (PAS) while the produced amount per unit volume is enhanced and side reactions are suppressed.

Abstract: A poly(phenylene sulfide) fiber contains 1-10% by weight of a poly(phenylene sulfide) oligomer having a weight-average molecular weight of 5,000 or less, has a difference between a cold crystallization heat quantity (?Hc) and a crystal melting heat quantity (?Hm) during temperature rising in DSC, ?Hm??Hc, of 25 J/g or larger, and has an elongation of less than 40% and a strength of 3.0 cN/dtex or higher. The poly(phenylene sulfide) fiber has high heat resistance and chemical resistance and high strength and, despite this, has excellent suitability for high-order processing, e.g., thermal shapability, because the amorphous parts thereof have high molecular movability.

Abstract: Methods of forming a polyarylene sulfide and systems as may be utilized in carrying out the methods are described. Included in the formation method is a filtration process for treatment of a mixture, the mixture including a polyarylene sulfide, a salt byproduct of the polyarylene sulfide formation reaction, and a solvent. The filtration process includes maintaining the downstream side of the filter medium at an increased pressure. The downstream pressure can such that the boiling temperature of the mixture at the downstream pressure can be higher than the temperature at which the polyarylene sulfide is insoluble in the solvent.

Abstract: A method for formation of a semi-crystalline polyarylene sulfide is described. The method can include reaction of sulfur-containing monomer with a dihaloaromatic monomer in an organic amide solvent to form a polymer following by combination of the polymer with a crystallization solution. The crystallization solution is pre-heated and the mixture formed is slowly cooled to crystallize the polymer.

Abstract: A method of producing a silane compound having a Formula (1) sulfonyl bond includes reacting a Formula (I) chlorosulfonyl compound with sodium sulfite in water as a solvent in the presence of a base, to produce a Formula (II) sulfinic acid sodium salt: and adding an aromatic hydrocarbon solvent to carry out azeotropic dehydration, and adding an aprotic polar solvent and a Formula (III) chloroalkylsilane compound. (wherein R1, R2, R3, R4, and R5 are each independently a substituent selected from a hydrogen atom, halogen atom, alkyl group, alkoxy group, haloalkyl group, haloalkoxy group, cyano group, and nitro group, R2 and R1 or R3 may form —CH?CH—CH?CH —together, R6 and R7 are each independently a C1-5 alkyl group, L is a single bond or saturated or unsaturated divalent C1-19 hydrocarbon group having a linear, branched, cyclic structure, or a combination thereof, and q is an integer of 1 to 3).

Abstract: Provided are antibodies that selectively bind to and inhibit activation of coagulation factor XII. Methods of treatment employing these antibodies are described herein.

Abstract: Described is a process for the production of a capacitor, where an electrode body (1) of an electrode material (2) is provided, wherein a dielectric (3) covers one surface (4) of this electrode material (2) at least partly to form an anode body (5), where the in situ polymerization of at least one thiophene monomer in at least a part of the anode body (5) in the presence of at least one oxidizing agent and at least one polymer with the structural formula (I).

Abstract: Methods of forming a polyarylene sulfide and systems as may be utilized in carrying out the methods are described. Included in the formation method is a filtration process for treatment of a mixture, the mixture including a polyarylene sulfide, a salt byproduct of the polyarylene sulfide formation reaction, and a solvent. The filtration process includes maintaining the downstream side of the filter medium at an increased pressure. The downstream pressure can such that the boiling temperature of the mixture at the downstream pressure can be higher than the temperature at which the polyarylene sulfide is insoluble in the solvent.

Abstract: A method for formation of a semi-crystalline polyarylene sulfide is described. The method can include reaction of sulfur-containing monomer with a dihaloaromatic monomer in an organic amide solvent to form a polymer following by combination of the polymer with a crystallization solution. The crystallization solution is pre-heated and the mixture formed is slowly cooled to crystallize the polymer.

Abstract: Disclosed is a process for making shape memory polyphenylene sulfide, comprising: curing polyphenylene sulfide to produce cured polyphenylene sulfide; comminuting the cured polyphenylene sulfide to form cured polyphenylene sulfide particles; disposing the cured polyphenylene sulfide particles in a mold; heating the mold for flowing the cured polyphenylene sulfide; compressing, by applying a compressive force, the cured polyphenylene sulfide; cooling the cured polyphenylene sulfide; relieving the compressive force; and de-molding the cured polyphenylene sulfide to produce the shape memory polyphenylene sulfide.

Abstract: The present invention relates to a method for separating volatile substances, particularly iodine, diiodised aromatic compounds and/or mixtures thereof, from material mixtures containing said compounds. The invention further relates to a device for producing polyarylene sulphides, by means of which volatile substances, particularly iodine and diiodised aromatic compounds, can be separated from the polymers.

Abstract: A method for formation of a semi-crystalline polyarylene sulfide is described. The method can include reaction of sulfur-containing monomer with a dihaloaromatic monomer in an organic amide solvent to form a polymer following by combination of the polymer with a crystallization solution. The crystallization solution is pre-heated and the mixture formed is slowly cooled to crystallize the polymer.

Abstract: Methods, devices, and systems that can be utilized in separating a polymer from other compounds of a polymer formation process are described. The methods utilize multiple sedimentors in a countercurrent flow design in conjunction with different solvent solutions in the multiple sedimentors to separate a product polymer from other compounds of a polymer formation process. The sedimentors include feed inlets that can encourage contact between countercurrent flows and improve mass transfer rates between the countercurrent flows.

Abstract: Methods of forming a polyarylene sulfide and systems as may be utilized in carrying out the methods are described. Included in the formation method is a filtration process for treatment of a mixture, the mixture including a polyarylene sulfide, a salt byproduct of the polyarylene sulfide formation reaction, and a solvent. The filtration process includes maintaining the downstream side of the filter medium at an increased pressure. The downstream pressure can such that the boiling temperature of the mixture at the downstream pressure can be higher than the temperature at which the polyarylene sulfide is insoluble in the solvent.

Abstract: A production process of a poly(arylene sulfide) (PAS), including a polymerization step of forming a PAS from a sulfur source that is an alkali metal (hydro)sulfides and a dihalo-aromatic compound in an organic amide solvent; a separation step of PAS particles; a countercurrent washing step that is a step of washing the PAS particles with water and/or an organic solvent, wherein a downward current of a PAS particle-containing aqueous slurry is continuously brought into countercurrent contact with an upward current of a washing liquid; a PAS particle re-separation step of capturing a washing waste liquid by a PAS particle re-separating unit, in which a micro-slit filter has been installed, and then re-separating the PAS particles from the micro-slit filter, preferably using a backwashing unit, to discharge them; and a collecting step of the PAS particles discharged, and a production apparatus of a poly(arylene sulfide).

Abstract: A production method includes a process (I) of heating a cyclic polyarylene sulfide composition under reduced pressure and a process (II) of heating and polymerizing a cyclic polyarylene sulfide composition. This simple method allows for production of a polyarylene sulfide of the higher molecular weight and can produce a polyarylene sulfide having a narrow molecular weight distribution, low gas generation and high industrial usability. Additionally, pelletization after the process (I) can produce a cyclic polyarylene sulfide pellet having ease of conveyance, excellent molding processability, less gas generation amount and high industrial usability.

Abstract: The present invention relates to a polyarylene sulfide that is prepared from a composition including 100 parts by weight of solid sulfur, 500 to 10,000 parts by weight of iodinated aryl compounds, and 0.03 to 30 parts by weight of a sulfur-containing polymerization terminator with respect to 100 parts by weight of the solid sulfur, and has a melting temperature (Tm) of 255 to 285° C., and luminosity of 40 or higher as defined by the CIE Lab color model, and a process of preparing the same. The PAS resin is prepared from a composition including a sulfur-containing polymerization terminator and thus has excellent thermal properties and luminosity.

Abstract: The present invention provides: a polyphenylene sulfide fiber that has excellent tensile strength; and a polyphenylene sulfide fiber that decreases in toughness to a small extent even when subjected to a long-term heat treatment and has excellent tensile strength. The polyphenylene sulfide fiber according to the present invention is characterized by comprising a polyphenylene sulfide resin having a weight average molecular weight of 50000 to 80000 inclusive, having a rigid amorphous content of 50% or more, and having a crystal size of 5 nm or more in the direction of a (111) crystal plane.

Abstract: The present invention relates to a polyarylene sulfide that is prepared from a composition including 100 parts by weight of solid sulfur, 500 to 10,000 parts by weight of iodinated aryl compounds, and 0.03 to 30 parts by weight of a sulfur-containing polymerization terminator with respect to 100 parts by weight of the solid sulfur, and has a melting temperature (Tm) of 255 to 285° C., and luminosity of 40 or higher as defined by the CIE Lab color model, and a process of preparing the same. The PAS resin is prepared from a composition including a sulfur-containing polymerization terminator and thus has excellent thermal properties and luminosity.

Abstract: A method for producing a polyarylene sulfide resin, comprising: producing a slurry (I) containing a solid alkali metal sulfide by allowing a hydrous alkali metal sulfide, or a hydrous alkali metal hydrosulfide and an alkali metal hydroxide, and an aliphatic cyclic compound (c1) that can be ring-opened by hydrolysis to react with each other while conducting dehydration in the presence of a non-hydrolyzable organic solvent; adding an aprotic polar organic solvent after the production of the slurry (I) and distilling off water to conduct dehydration; and conducting polymerization by allowing a polyhaloaromatic compound (a), an alkali metal hydrosulfide (b), and an alkali metal salt (c2) of a hydrolysate of the compound (c1) to react with each other in the slurry (I) in a state where the amount of water existing in the reaction system is 0.02 moles or less relative to 1 mole of the aprotic polar organic solvent.

Abstract: There is provided a production method of a cyclic polyarylene sulfide from a reaction mixture including at least a sulfidizing agent (a), a dihalogenated aromatic compound (b) and an organic polar solvent (c). The production method includes: a process 1 of heating the reaction mixture having an arylene unit of not less than 0.80 mol but less than 1.05 mol per 1 mol of the sulfur content in the reaction mixture; and subsequent to the process 1, a process 2 of further causing the reaction to proceed after addition of the dihalogenated aromatic compound (b) to have the arylene unit of not less than 1.05 mol and not greater than 1.50 mol per 1 mol of the sulfur content in the reaction mixture.

Abstract: A method for preparing polyarylene sulfide having reduced iodine content and excellent thermal stability is described. The method includes reacting a composition comprising diiodide aromatic compounds, sulfur compounds, and a polymerization terminator. The preparation method may effectively reduce iodine content of polyarylene sulfide to prevent corrosion of post processing equipment, improve properties of polyarylene sulfide such as thermal stability, and the like, and thus, it may be usefully applied in the industrial field relating to preparation of polyarylene sulfide.

Abstract: It is aimed to provide a polyarylene sulfide film for an acoustic instrument vibrating plate excellent in heat resistance, molding processability, acoustic properties, and also heat moldability. Provided is a polyarylene sulfide film wherein the elongation at break in either a longitudinal direction or a width direction of the film is 100% or more and 250% or less, and the Young's modulus in either a longitudinal direction or a width direction of the film is 1.5 GPa or more and less than 4 GPa.

Abstract: A method for producing a polyarylene sulfide resin, comprising: producing a slurry (I) containing a solid alkali metal sulfide by allowing a hydrous alkali metal sulfide, or a hydrous alkali metal hydrosulfide and an alkali metal hydroxide, and an aliphatic cyclic compound (c1) that can be ring-opened by hydrolysis to react with each other while conducting dehydration in the presence of a non-hydrolyzable organic solvent; adding an aprotic polar organic solvent after the production of the slurry (I) and distilling off water to conduct dehydration; and conducting polymerization by allowing a polyhaloaromatic compound (a), an alkali metal hydrosulfide (b), and an alkali metal salt (c2) of a hydrolysate of the compound (c1) to react with each other in the slurry (I) in a state where the amount of water existing in the reaction system is 0.02 moles or less relative to 1 mole of the aprotic polar organic solvent.

Abstract: The invention provides a production process of a poly(arylene sulfide) which contains a step of polymerizing a sulfur source and a dihalo-aromatic compound in an organic amide solvent, said polymerization step containing a phase-separation polymerization step that the polymerization reaction is continued in the presence of a phase separation agent in a phase-separated state, wherein a monohalo-organic compound is added in a proportion of 0.005 to 20 mol per 100 mol of the charged sulfur source into the polymerization reaction system at the time a conversion of the dihalo-aromatic compound has reached 80 to 99% after initiation of the polymerization reaction and before the liquid phase becomes the phase-separated state to be reacted with a formed polymer, and the liquid phase within the polymerization reaction system is then converted to the phase-separated state to continue the polymerization reaction.

Abstract: The invention provides a production process of a granular poly(arylene sulfide) by polymerizing a sulfur source and a dihalo-aromatic compound in an organic amide solvent by a polymerization process containing a phase-separation polymerization step, wherein the production process contains a step I of adding an aromatic compound in a proportion of 0.01 to 20 mol per 100 mol of the organic amide solvent into the liquid phase containing the organic amide solvent and a formed polymer within the polymerization reaction system, said liquid phase being in the phase-separated state, after the phase-separation polymerization step; a step II of cooling the liquid phase within the polymerization reaction system; and a step III of collecting the formed polymer from the liquid phase.

Abstract: There are provided, according to the present invention, a resin composition for hollow blow-molded article which is obtained in a high productivity on an industrial scale with excellent moldability and drawdown resistance, and the production method thereof, by melting and mixing a polyarylene sulfide resin including a terminal carboxyl group within the resin in an amount of 25 to 45 (?mol/g), and having a non-Newtonian index of 0.90 to 1.15 and also a melt viscosity as measured at 300° C. within the range of 1,000 poise to 3,000 poise and an epoxy group-containing polyolefin so that the proportion of the epoxy group-containing polyolefin is 5 to 30 parts by mass with respect to 100 parts by mass of the polyarylene sulfide resin; and a hollow blow-molded article with excellent mechanical strength, such as the heat resistance and impact resistance, and surface appearance, and the production method thereof.

Abstract: The polymerization catalyst for a polythiourethane-based optical material of the present invention includes a sulfonate represented by the following general formula (1). Furthermore, in the formula, R1, R2, R3 and R4 each independently represent an alkyl group having 1 to 18 carbon atoms, R1, R2, R3 and R4 may be bonded to each other to form a ring. R5 represents a hydrogen atom or an alkyl group having 1 to 18 carbon atoms, and X represents a nitrogen atom or a phosphorus atom.

Abstract: According to the present invention, a resin compound for optical material, comprising (a) an episulfide compound represented by a specific structural formula, (b) a xylylenedithiol compound and (c) a xylylenediisocyanate compound can be provided. In a preferable embodiment of the present invention, a resin compound for optical material having superb optical properties, a high density and a high thermal resistance can be provided. Also according to the present invention, an optical material obtained by curing the above-described resin compound can be provided.

Abstract: A method is provided for producing a polyarylene sulfide by reacting a sulfidizing agent with a dihalogenated aromatic compound in an organic polar solvent in the presence of an alkali metal hydroxide, the method includes <Step 1>: carrying out the reaction in such a manner that the polymerization time in a temperature range of 230° C. to less than 245° C. (T1a) is not less than 30 minutes and less than 3.5 hours and that the conversion ratio of the dihalogenated aromatic compound at the end of the step is 70 to 98 mol. % and <Step 2>: carrying out the reaction in such a manner that the polymerization time in a temperature range of 245° C. to less than 280° C. (T2) is not less than 5 minutes and less than 1 hour.

Abstract: The present invention relates to a process of producing polyarylene sulfide (PAS) and PAS resin produced therefrom, and more specifically, to a process of preparing polyarylene sulfide with better thermal properties and luminosity than conventional PAS and the PAS resin produced therefrom, including the steps of: a) melting and mixing a composition including solid sulfur, iodinated aryl compounds, and a polymerization terminator; b) polymerizing the molten mixture of step a) for 1 to 30 hours while increasing the temperature and decreasing the pressure from initial reaction conditions of a temperature of 180 to 250° C. and a pressure of 50 to 450 Torr to final reaction conditions of a temperature of 270 to 350° C. and a pressure of 0.001 to 20 Torr; and c) heating the reaction product of step b) at a temperature of 270 to 350° C. for 1 to 25 hours.

Abstract: A method for producing an acid group-containing polyarylene sulfide of the present invention includes a reaction step of reacting a polyhaloaromatic compound (a), an alkali metal hydrosulfide (b), and an alkali metal carboxylate (c) in the presence of a solid alkali metal sulfide and a lithium ion.

Abstract: A production process of a poly(arylene sulfide) (PAS), including a polymerization step of forming a PAS from a sulfur source that is an alkali metal (hydro)sulfides and a dihalo-aromatic compound in an organic amide solvent; a separation step of PAS particles; a countercurrent washing step that is a step of washing the PAS particles with water and/or an organic solvent, wherein a downward current of a PAS particle-containing aqueous slurry is continuously brought into countercurrent contact with an upward current of a washing liquid; a PAS particle re-separation step of capturing a washing waste liquid by a PAS particle re-separating unit, in which a micro-slit filter has been installed, and then re-separating the PAS particles from the micro-slit filter, preferably using a backwashing unit, to discharge them; and a collecting step of the PAS particles discharged, and a production apparatus of a poly(arylene sulfide).

Abstract: A method for producing an acid group-containing polyarylene sulfide of the present invention includes a reaction step of reacting a polyhaloaromatic compound (a), an alkali metal hydrosulfide (b), an alkali metal carboxylate (c), and an aromatic compound (d) having an elimination group and an acid group, which function in a nucleophilic reaction, in the presence of a solid alkali metal sulfide.

Abstract: Disclosed is a process for producing poly(arylene sulfide) which includes: a polymerization step of polymerizing a dihalogenated aromatic compound and at least one sulfur source selected from the group consisting of alkali metal sulfides and alkali metal hydrogen sulfides in an organic amide solvent, preferably in the presence of a phase separating agent; a separation step of separating a polymer from a reaction liquid containing a produced polymer after the polymerization step; a washing step of washing the polymer with a washing liquid that consists of water and/or an organic solvent; and a separated liquid treatment step of bringing both a separated liquid that has been recovered after the separation of the polymer in the separation step and a separated liquid containing a wash waste liquid that has been recovered after the separation of the polymer in the washing step into contact with an alkaline compound. Also disclosed is poly(arylene sulfide).

Abstract: A thermoplastic material comprises the cure product of a thermoplastic polymer having a thermal decomposition temperature greater than or equal to about 200° C., the thermoplastic polymer being cured at a temperature of about 200° C. to about 400° C., for a total time of less than or equal to 200 hours. An article is formed from the thermoplastic material.

Abstract: A biaxially oriented polyarylene sulfide film which has an excellent elongation at break and flatness is provided. The biaxially oriented film may be a biaxially oriented polyarylene sulfide film which is substantially composed of a polyarylene sulfide resin (A), wherein one of the elongations at break in the machine direction and in the transverse direction of the film is not lower than 110%; one of the breaking stresses in the machine direction and in the transverse direction of the film of the film is not higher than 200 MPa; and both of the heat shrinkage ratio in the machine direction of the film and that in the transverse direction of the film at 260° C. for 10 minutes are not less than 0% and not more than 10%.

Abstract: An optical material is provided that has a high transmittance, a high refractive index, a low Abbe constant, a high secondary dispersion property, and a low water absorption rate. The optical material includes a polymer of a mixture which contains: a sulfur-containing compound represented by the following general formula (1): a sulfur-containing compound represented by the following general formula (2): and an energy polymerization initiator, in which a content of the sulfur-containing compound represented by the chemical formula (2) is 10% by weight or more to 60% by weight or less, an Abbe constant (?d) of the polymer of the mixture satisfies 18<?d<23, and a secondary dispersion property (?g,F) thereof satisfies 0.68<?g,F<0.69.

Abstract: A column-type solid-liquid countercurrent contact apparatus, a washing apparatus for solid particles such as poly(arylene sulfide) (PAS) particles, a PAS manufacturing apparatus, a method of solid-liquid countercurrent contact, a method of washing solid particles such as PAS particles, and a method of manufacturing PAS, wherein a column top part, a column body part, and a column bottom part are included, the column body part is provided with a plurality of stirring chambers connected in the vertical direction and mutually divided by a ring-shaped partitioning plate, a paddle blade (a blade diameter/a diameter of the stirring chamber?0.65 and the blade diameter/the diameter of the stirring chamber?0.10) and a baffle are disposed at each of the plurality of stirring chambers, and a disc having a size covering at least a part of a communication opening positioned below the paddle blade is attached to a rotating shaft or to the paddle blade.