JPH07233280A - Production of high-molecular material composition - Google Patents

Abstract

PURPOSE:To easily obtain a high-molecular material compsn. with a low elasticity and excellent phase structure and properties by mixing a low-molecular material with an intervenient material under specified conditions and mixing the resulting composite with a high-molecular material under specified conditions. CONSTITUTION:1.0 pts.wt. low-molecular material having a viscosity at 100 deg.C of 5X10<5>cP lower is mixed with a least 1.0 pts.wt. intervenient material having a solubility parameter different from that of the low-molecular material by 3.0 or lower on a mixer at a rate of shear (defined by the formula) of 5.0X10<2> or higher at the m.p. or glass transition point of the intervenient material or higher, the giving a composite wherein the intervenient material has a continuous three-dimensional network structure. The composite is mixed with a high- molecular material having a solubility parameter different from that of the low-molecular material by 4 or lower in a wt. ratio of the high-molecular material to the low-molecular material of 0.5 or higher on a mixer at a rate of revolution of 20-100rpm at 30-100 deg.C to give the target high-molecular material compsn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polymer composition, and more specifically to controlling the phase structure, low elastic modulus, uniform dispersion of a large amount of low molecular weight materials, and bleeding (suppression of low molecular weight materials). ) Property, versatility, and industrial productivity, the present invention relates to a method for producing a polymer composition.

[0002]

2. Description of the Related Art In the field of polymer materials, in recent years, in combination with a variety of applications, a polymer composition having a very low elastic modulus, which has high performance, high functionality and versatility, such as a very low A rubber composition having an elastic modulus and a plastic composition having an extremely low elastic modulus are required, and a manufacturing method for obtaining the composition, that is, a technique for blending a large amount of a low molecular weight material and a high molecular weight material is strongly demanded.

Regarding the phase structure of a blend of polymer materials, which is important in relation to this blending technique, research on the mechanism of phase separation and the manifestation of physical properties has been conducted academically and by thermodynamic treatment and rheological consideration. It has been extensively developed, and in particular, thermodynamic studies with compatibility between materials and temperature as basic parameters have been actively conducted, and it has been shown that the phase structure of the blend in the equilibrium state is theoretically predicted. As described above, research on the phase separation mechanism in the compatible region, the metastable region, and the incompatible region has been actively conducted, but little attention has been paid to the manufacturing method and the manufacturing apparatus relationship for producing the phase structure of such a blend. .

As is well known, it is not easy to blend a large amount of a low molecular weight material and a high molecular weight material to produce a uniform polymer composition having a controlled phase structure. As one manufacturing method, there is a method of kneading both materials by using a general kneader, but in many cases, the polymer material slips between the rotors, and effective kneading cannot be performed. Even at first glance, even if it seems that mixing has been completed, such an incomplete kneading tends to cause the low molecular weight material to bleed to the surface. Also,
Another manufacturing method is a method in which a low-molecular material and a high-molecular material having good compatibility are mixed for a long period of time (in extreme cases, several days) and swelled, but this is not suitable for industrial production.

[0005]

Thus, it has been a great problem to find a method for easily producing a polymer material having a low elastic modulus which is excellent in phase structure and various physical properties.

As is clear from the above description,
The purpose of the present invention is to control the phase structure, low elastic modulus,
It is an object of the present invention to provide a method for producing a polymer composition, which is excellent in uniform dispersibility of a large amount of low molecular weight materials, bleeding (suppression) of low molecular weight materials, versatility, and industrial productivity.

[0007]

The method for producing a polymer composition of the present invention comprises at least a step (A) of mixing a low molecular weight material and a medium material to obtain a low molecular weight material-holding medium composite. A method for producing a polymer composition, comprising the step (B) of mixing a composite with at least a polymer material, the step (A)
Indicates that the low molecular weight material has a viscosity of 5 × 10 ⁵ centipoise or less at 100 ° C., and the difference in solubility parameter value between the low molecular weight material and the medium material is 3.0 or less. A low molecular weight material and a medium material having a weight ratio of 1.0 or more are sheared with a mixer at a shear rate V = v / t (sec ⁻¹ ).
[V (m / sec): Rotating peripheral speed of the rotor, t
(M): clearance between fixed wall and rotor] is 5.0
A step of mixing under a shearing condition of × 10 ² or more so that the mixing temperature is equal to or higher than the melting point or glass transition point of the medium material to obtain a low molecular weight material-holding medium composite having a three-dimensional continuous network skeleton structure. In the step (B), the difference in solubility parameter value between the low molecular weight material and the high molecular weight material is 4.0 or less, and the weight ratio of the low molecular weight material and the high molecular weight material is 0. A polymer material having a value of 0.5 or more is mixed with a mixer.
Rotation speed 20 to 100 r. p. m. And the mixing temperature is 30
Including both steps, which is a step of mixing at ~ 100 ° C,
It is characterized by

The inventors of the present invention have made intensive studies by paying attention to materials, mixing conditions, phase structure and their physical properties, and as a result, when a predetermined low molecular weight material and a medium material are mixed by a mixer under specific shearing conditions. By forming a three-dimensional continuous network skeleton phase structure in which the medium material is uniformly dispersed throughout the system, a composite material that retains a large amount of low molecular weight material is obtained. It was found that the above object can be achieved by mixing and under the specific mixing conditions, and the present invention has been completed.

The present invention will be described in detail below. The method for producing a polymer composition of the present invention comprises mixing a low molecular weight material and a medium material with a mixer under specific shearing conditions and temperatures, and the medium material has a three-dimensional continuous network skeleton structure. It comprises a step (A) of obtaining a holding medium material composite and a step (B) of mixing the composite with a polymer material and the like under a specific mixing condition with a mixer.

The shearing conditions in the step (A) are extremely important requirements for achieving the object of the present invention, and the shearing rate of the mixer is V = v / t (sec ^-1 ) (v (m / sec). :
Rotor peripheral velocity, t (m): clearance between fixed wall and rotor), shear rate V is 5.0
× 10 ² (sec ⁻¹ ) or more, preferably 1.0 ×
It is 10 ³ (sec ⁻¹ ) or more, more preferably 2.
It is 5 × 10 ⁻³ (sec ⁻¹ ) or more, and most preferably 5.0 × 10 ³ (sec ⁻¹ ) or more. V is represented by a function of the peripheral velocity v and the clearance t regardless of the size of the mixer, and v and t are related to the size of the mixer, and particularly v
Depends on the number of rotations of the rotor of the mixer and the rotation circumference, that is, the size of the rotor. Therefore, it is difficult to specify v and t individually, but usually v is preferably 0.5 (m / sec ⁻¹ ) or more, more preferably 1.0 (m / sec ⁻¹ ) or more, and 2.0 (m / sec ⁻¹ ) or more. m / sec ⁻¹ ) or higher is most preferable. Usually, t is preferably 3 × 10 ⁻³ (m) or less, and 2 × 10 ⁻³
(M) or less is more preferable, and 1 × 10 ⁻³ (m) or less is most preferable.

By the method of the step (A), the medium material has a three-dimensional continuous network skeleton structure, the low molecular weight material and the medium material are uniformly dispersed in the order of micron, and a large amount of the low molecular weight material is retained. The medium material composite can be easily obtained.

When the shear rate V is less than 5.0 × 10 ² , the obtained composite cannot have a three-dimensional continuous network skeleton phase structure, and the object of the present invention cannot be achieved.

As the mixer used in the mixing in the step (A) of the present invention, any high shear type mixer satisfying the shear rate V can be used.

In general, the equipment used for mixing and kneading materials mixes little with shearing force, but with a mixer aiming for uniform dispersion, and by applying shearing force, the components are reduced in size while It is roughly divided into kneading machines aiming at homogenization. As this mixer, there are a bomb blender, tumble mixer, and Henschel mixer that mainly use the rotation of a stirring blade, while as a kneader, an open roll and a Banbury mixer that use the shearing action between two rolls or rotors. Alternatively, a single-screw or twin-screw extruder or the like is used. However, these general-purpose mixers and kneaders all have a shear rate V of 1 × 10.
It is about ² (sec ⁻¹ ) or less, and this is not suitable for the step (A) of the present invention because the object of the present invention cannot be achieved.

In the step (A) of the present invention, the mixing temperature of the low molecular weight material and the medium material is higher than the melting point of the medium material (when the medium material has a crystal structure) or the glass transition point (when the medium material has an agglomerated structure). ) It is preferable to keep the temperature above. However, when the compatibility between the low molecular weight material and the medium material is extremely good, it is possible to mix at a temperature below the melting point or below the glass transition point.

In the step (B), the mixing of the composite and the polymer material and the like is carried out at a rotation speed of the mixer of 20 to 100.
r. p. m. , Preferably 30-80 r. p. m. so,
The temperature is 30 to 100 ° C, preferably 40 to 90 ° C. If the number of rotations and the temperature deviate from this range, it is difficult to obtain the effect of the present invention, which is not preferable.

As the mixer used for the mixing in the step (B) of the present invention, any mixer can be used as long as it satisfies the above mixing conditions.

By the combination of the step (A) and the step (B), the phase structure is controlled, the low elastic modulus, the uniform dispersibility of a large amount of the low molecular weight material, and the bleeding (suppression) of the low molecular weight material are excellent. The molecular composition can be easily obtained. Although a uniform mechanism by which the composite obtained in the step (A) is uniformly dispersed in the polymer material is not clear, most of the composite obtained by the step (B) of the present invention is high in a state of being divided into fine particles. It is believed to be retained in the molecular material.
Even if a large amount of low molecular weight material, a medium material and a high molecular weight material are simultaneously mixed without going through the steps (A) and (B), or if a large amount of low molecular weight material and a high molecular weight material are directly mixed, It is not possible to obtain a torus polymer composition.

The low molecular weight material used in the method for producing the polymer composition of the present invention has a viscosity of 5 × 10 at 100 ° C.
The material is ⁵ centipoise or less, preferably 1 × 10 ⁵ centipoise or less. From the viewpoint of the molecular weight, the number average molecular weight of the low molecular weight material is 20,000 or less, preferably 1
It is 50,000 or less, more preferably 5,000 or less. Usually, a liquid or liquid material at room temperature is preferably used. Further, both hydrophilic and hydrophobic low molecular weight materials can be used.

As the low molecular weight material, any material can be used as long as it satisfies the above-mentioned conditions, and there is no particular limitation, but examples thereof include the following materials.

Softening agent: A softening agent for various rubbers or resins such as mineral oils, vegetable oils and synthetics. Examples of the mineral oil-based oil include process oils such as aromatic oils, naphthene oils, and paraffin oils. As vegetable oils, castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil,
Examples include coconut oil, peanut oil, wood wax, pine oil, olive oil and the like.

Plasticizers: various ester plasticizers such as phthalic acid esters, mixed phthalic acid esters, aliphatic dibasic acid esters, glycol esters, fatty acid esters, phosphoric acid esters, stearic acid esters, epoxy plasticizers, etc. Plasticizer for plastics or phthalate type,
Adipate-based, sebacate-based, phosphate-based, polyether-based, polyester-based, etc. plasticizers for NBR.

Tackifier: Various tackifiers (tackifiers) such as coumarone resin, coumarone-indene resin, phenol terpene resin, petroleum hydrocarbon and rosin derivative.

Oligomer: Crown ether, fluorine-containing oligomer, polyisobutylene, xylene resin, chlorinated rubber, polyethylene wax, petroleum resin, rosin ester rubber, polyalkylene glycol diacrylate,
Liquid rubber (polybutadiene, styrene-butadiene rubber, butadiene-acrylonitrile rubber, polychloroprene, etc.), silicone-based oligomers, various oligomers such as poly-α-olefins.

Lubricants: Hydrocarbon lubricants such as paraffin and wax, fatty acid lubricants such as higher fatty acids and oxyfatty acids, fatty acid amide lubricants such as fatty acid amides and alkylenebisfatty acid amides, fatty acid lower alcohol esters, fatty acid polyhydric alcohol esters. , Ester-based lubricants such as fatty acid polyglycol esters, alcohol-based lubricants such as fatty alcohols, polyhydric alcohols, polyglycols and polyglycerols, various lubricants such as metal soaps and mixed lubricants.

In addition, latex, emulsion, liquid crystal, bituminous composition, clay, natural starch, sugar, inorganic silicone oil, phosphazene and the like are also suitable as the low molecular weight material. In addition, beef oil, pork oil, horse oil sugar animal oil,
Bird or fish oil: honey, fruit, or chocolate,
Organic solvents such as dairy products such as yogurt, hydrocarbons, halogenated hydrocarbons, alcohols, phenols, ethers, acetals, ketones, fatty acids, esters, nitrogen compounds, sulfur compounds: Alternatively, various medicinal components, soil modifiers, fertilizers, petroleum, water and aqueous solutions are suitable. These components may be used alone or in combination of two or more.

The low molecular weight material is selected and optimized in consideration of the required characteristics and uses of the polymer composition, the compatibility with other materials of the present invention such as the medium material and the polymer material. Used in various amounts.

The medium material used in the method for producing a polymer composition of the present invention is a material having a function as a medium of a low molecular weight material and a polymer material, and is an important component for achieving the object of the present invention. is there. Specifically, as described above, in order to enable a uniform composition of a large amount of low molecular weight material and a high molecular weight material, a low molecular weight material holding a large amount of low molecular weight material using a large amount of low molecular weight material and a medium material. First, a holding medium material composite is obtained, and a polymer composition holding a large amount of a target low molecular weight material is obtained by combining this with a polymer material. Here, "holding" the low molecular weight material means that the low molecular weight material is uniformly dispersed in the medium material and the high molecular weight material, and does not bleed, or bleeding is suppressed. Of course, the degree of bleeding can be easily controlled depending on the purpose of the polymer composition.

As the medium material of the present invention, any material can be used as long as it has a function as described above and forms a composite material that holds a large amount of low molecular weight material, but in order to fully develop this holding ability. In addition, a medium material having a three-dimensional continuous reticulated skeleton phase structure in the composite obtained by the step (A) is selected. As the medium material, usually, a thermoplastic polymer material or various materials having the polymer material as a constituent element is used.

Examples of the medium material include styrene type (butadiene styrene type, isoprene styrene type, etc.), vinyl chloride type, olefin type (butadiene type, isoprene type,
Ethylene propylene type, etc.), ester type, amide type, urethane type, and other thermoplastic elastomers, and their hydrogenated and other modified products, styrene type, ABS
Type, olefin type (ethylene type, propylene type, ethylene propylene type, ethylene styrene type, propylene styrene type, etc.), acrylic ester type (methyl acrylate type, etc.), methacrylic acid ester type (methyl methacrylate type, etc.), carbonate Series, acetal series, nylon series,
Halogenated polyether type (chlorinated polyether type, etc.),
Halogenated olefin type (vinyl chloride type, tetrafluoroethylene type, fluorinated-ethylene chloride type, fluorinated ethylene propylene type, etc.), cellulose type (acetyl cellulose type,
Examples thereof include thermoplastic resins such as ethylcellulose-based), vinylidene-based, vinyl butyral-based, alkylene oxide-based (propylene oxide-based, etc.), and rubber-modified products of these resins.

Among these, it is preferable that a portion where a hard block such as a crystal structure or an agglomerated structure is easily formed and a soft block such as an amorphous structure are mixed together.

Regarding the low molecular weight material, the medium material, and the low molecular weight material-holding medium material composite in the present invention, a part thereof is described in JP-A-5-23.
9256 and Japanese Patent Laid-Open No. 5-194763. As the medium material, those having the three-dimensional continuous network skeleton structure disclosed in this publication are preferably used in the present invention.

The medium material in the present invention is not particularly limited, but it can be used in the usual bulk form, granular form, gel form, foam form, non-woven fabric form and the like. It can also be used in a form in which a capsule containing a low molecular weight material is incorporated.

Further, in obtaining a low molecular weight material-holding medium material composite containing a large amount of low molecular weight material and medium material, the difference in solubility parameter value between the low molecular weight material and the medium material used is 3.
Both materials are selected to be 0 or less, preferably 2.5 or less. If this difference exceeds 3.0, from the viewpoint of compatibility,
It is not preferable because it is difficult to retain a large amount of the low molecular weight material, which is an obstacle to lowering the elastic modulus of the polymer composition, and bleeding of the low molecular weight material is likely to occur.

Further, the weight ratio of the low molecular weight material to the medium material is 1.
It is 0 or more, preferably 2.0 or more, and more preferably 3.0 or more. If this weight ratio is less than 1.0, it becomes difficult to obtain a polymer composition having a very low elastic modulus, and the object of the present invention cannot be achieved.

The polymer material used in the method for producing the polymer composition of the present invention is not particularly limited as long as it is a versatile material. That is, ordinary thermoplastic materials or thermosetting materials can be widely used.

Examples of the thermoplastic material include styrene type (butadiene styrene type, isoprene styrene type, etc.),
Various thermoplastic elastomers such as vinyl chloride-based, olefin-based (butadiene-based, isoprene-based, ethylene-propylene-based, etc.), ester-based, amide-based, urethane-based, and their hydrogenated and other modified products, styrene-based,
ABS type, olefin type (ethylene type, propylene type,
Ethylene propylene type, ethylene styrene type, propylene styrene type, etc.), vinyl chloride type, acrylic acid ester type (methyl acrylate type etc.), methacrylic acid ester type (methyl methacrylate type etc.), carbonate type, acetal type, nylon type , Halogenated polyether type (chlorinated polyether type etc.), halogenated olefin type (tetrafluoroethylene type, fluorinated-ethylene chloride type, fluorinated ethylene propylene type etc.), cellulose type (acetyl cellulose type, ethyl cellulose type etc.) , Vinylidene-based, vinyl butyral-based, alkylene oxide-based (propylene oxide-based, etc.) thermoplastic resins, and rubber-modified products of these resins.

On the other hand, examples of thermosetting materials, that is, materials which are thermoset in the presence or absence of a curing agent include ethylene propylene rubber (EPR, EPDM), nitrile rubber (NBR), butyl rubber, halogenated butyl rubber, and the like. Chloroprene rubber (CR), natural rubber (NR), isoprene rubber (IR), styrene-butadiene rubber (SBR), butadiene rubber (BR), acrylic rubber, ethylene-vinyl acetate rubber (EVA), general rubber such as polyurethane, silicone rubber , Fluorine rubber, ethylene acrylic rubber, polyester elastomer, epichlorohydrin rubber, polysulfide rubber, hypalon, special rubber such as chlorinated polyethylene, phenol, urea, melamine, aniline, unsaturated polyester, diallyl phthalate, epoxy alkyd, silicon, polyimide, How the thermosetting resin.

In the present invention, both materials are selected so that the difference in solubility parameter value between the low molecular weight material and the high molecular weight material is 4.0 or less, preferably 3.0 or less. The low molecular weight material is mixed with the high molecular weight material in the form of a low molecular weight material holding medium composite, and the compatibility between the low molecular weight material and the high molecular weight material is also a problem in this case. If the difference in this parameter exceeds 4.0, the low molecular weight material that is retained in a large amount in the composite is difficult to retain in the polymer material from the viewpoint of compatibility, and the elastic modulus of the polymer composition decreases. It is not preferable because it causes trouble and bleeding of low molecular weight material is likely to occur.

The weight ratio of the low molecular weight material to the high molecular weight material is 0.5 or more, preferably 0.8 or more, more preferably 1.0 or more. If the weight ratio is less than 0.5, it becomes difficult to obtain a polymer composition having a very low elastic modulus, which is not preferable.

The polymer composition of the present invention can be controlled to have a desired elastic modulus in the low elastic modulus region. For example, with Asker C hardness at a measurement temperature of 25 ° C., an ultra low elastic modulus of 10 or less can be easily achieved.

In the present invention, as a material component, in addition to the above-mentioned low molecular weight material, medium material and polymer material, if necessary,
Further, the following filler may be added. That is, clay, diatomaceous earth, carbon black, silica, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxides, mica, graphite, scale-like inorganic fillers such as aluminum hydroxide, various metal powders, wood chips, Glass powder,
Ceramic powder, granular or powdery solid filler such as granular or powdered polymer, other various natural or artificial short fibers, long fibers (for example, straw, hair, glass fiber, metal fiber, other various polymer fibers, etc.) Can be used.

The polymer composition obtained by the production method of the present invention is suitably used in all industrial fields, particularly home appliances, sports equipment, industrial equipment, precision equipment, transportation equipment, construction, civil engineering, medical care, leisure and the like.

The use of the polymer composition obtained by the production method of the present invention will be described in detail below. Since the polymer composition of the present invention can hold a large amount of low molecular weight material such as liquid, the elastic modulus can be controlled to an extremely low range. The composition can provide commercial products in a wide range of industrial fields. For example, as the vibration-proof / vibration-damping / cushioning material, a sealing member, a packing, a gasket, a fixing member such as a grommet, a support member such as a mount, a holder, and an insulator, and a cushioning member such as a stopper, a cushion, and a bumper can be cited. In addition, the present composition is, for example, as a product, a cooler, a washing machine, a refrigerator, a fan, a vacuum cleaner, a dryer,
It is preferably used for devices that generate vibrations and sounds such as printers and blowers, or home electric appliances. Furthermore, as shock absorbers, sports equipment such as grabs, mitts, golf clubs, and tennis rackets, for insoles of shoes, various toys, audio equipment, electronic / electrical equipment, beds, chairs, especially medical beds that keep the same posture for a long time. It is preferably used as a material for barber / beauty beds, theater chairs, and vehicle seats that are subject to vibration.

It can also be used in medical equipment such as artificial legs, artificial hands, robots, electrode materials for measuring electrocardiograms, electrode materials for low-frequency therapeutic devices, and the like. Further, it is used as an ultra-low hardness rubber for office automation equipment, seismic isolation rubber, anti-vibration rubber, and even racing tires. Further, it is suitable as a low hardness plastic as various molding materials. Further, since it is possible to control the release of the low molecular weight material to the outside, it is also used for various sustained release materials utilizing the release characteristics of aromatic agents, medical agents, functional materials and the like.

Further, since low molecular weight materials such as various liquids can be handled as a solid state, it is suitable for use as a functional material such as an electrolytic solution film, a liquid crystal film, an adhesive film and a paint film.

[0047]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples as long as the gist of the present invention is not exceeded.

[Example 1] As the step (A), the following low molecular weight material and medium material were mixed using a mixer shown in FIG. The mixing method will be described with reference to FIG.

A predetermined amount of liquid (low molecular weight material) and medium material are added to the mixer. A rotor (turbine) supported by a bearing 10 and coupled to a rotor (turbine) shaft 12
The high-speed rotation of 14 causes the agitated product to be sucked from the lower part of the fixed wall (stator) 16 by using the suction action, and the clearance between the high-speed rotating rotor 14 and the fixed wall 16 causes the agitated product to undergo strong shearing and impact.・ Being affected by turbulence,
Discharge upward from the discharge hole 18. This rising flow is transformed by the upper commutation plate 20, lowered along the side surface of the mixer, and returned to the bottom portion of the mixer again.

The mixing conditions in this example are as follows. Shearing speed V: 1.0 × 10 ⁴ (sec ⁻¹ ), rotor peripheral velocity v: 5.0 (m / sec), clearance t between fixed wall and rotor: 5 × 10 ⁻⁴ (m), Mixing temperature: 170 ° C., mixing time: 1 hour The liquid-holding medium material composite obtained in this step (A) has a three-dimensional continuous network skeleton phase structure in the medium material and contains a large amount of liquid. Regardless, the liquid bleed was small and uniform.

Next, in the step (B), the composite and the polymer material shown below were rotated with a Brabender at a rotation speed of 60 rpm.
p. m. The mixture was mixed at 40 ° C for 10 minutes. The obtained polymer composition was cured at 155 ° C. for 30 minutes. The obtained cured product had an Asker C hardness of 24 at 25 ° C. Both the polymer composition and the cured product were uniform without bleeding of the low molecular weight material. Since the cured product of the polymer composition thus obtained uses general-purpose low-molecular materials and high-molecular materials, it has versatility and has a very low elastic modulus that holds a large amount of low-molecular materials. It turned out to be a material.

Material ─────────────────────────────── Liquid (low molecular weight material) Synthetic aroma oil ¹⁾ Medium water Addition SBR (Molecular weight 90,000) Polymer material SBR ²⁾ ─────────────────────────────── Liquid viscosity (100 ℃ ) 6 centipoise SP difference ³⁾ between liquid and medium material 0.4 Difference SP value between liquid and polymer material ³⁾ 0.5 Mixing weight ratio of liquid and medium material 4 Liquid and polymer material Mixing weight ratio of 2 ─────────────────────────────── 1) Japan Sun Oil Co., Ltd. Z-300 2) SBR ( 1507) manufactured by Japan Synthetic Rubber Co., Ltd. was prepared in advance as the following mixture and used.

SBR 100 parts by weight White luster flower CC 3 parts by weight Carbon 3 parts by weight Sulfur 2 parts by weight Others (promoter etc.) 2.5 parts by weight 3) Solubility Parameter Value [Comparative Example 1] Comparative Example 1 is in the step (A). A liquid (low molecular weight material) and a medium material were mixed in the same manner as in Example 1 except that the mixture was mixed under the following mixing conditions.

Shear rate V: 1.0 × 10 ² (se
c ^-1 ), the rotational peripheral speed of the rotor v: 0.05 (m / se
c), clearance between fixed wall and rotor t: 5 × 1
0 ⁻⁴ (m), mixing temperature: 170 ° C., mixing time: 1 hour As a result, a uniform mixture of the liquid and the medium material was not obtained.

[0055]

Since the method for producing a polymer composition of the present invention has the above-mentioned constitution, the phase structure is controlled, the low elastic modulus, the uniform dispersibility of a large amount of the low molecular weight material, and the bleeding (suppression) of the low molecular weight material. It has an excellent effect that a polymer composition having excellent properties and versatility can be easily produced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an outline of a mixer used in Example 1 of the present invention.

[Explanation of symbols]

 10 bearing 12 rotor shaft 14 rotor 16 fixed wall 18 discharge hole 20 commutation plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Matsuse 3-3-5-209 Ogawa Higashicho, Kodaira-shi, Tokyo (72) Inventor Mihide Fukahori 2-9-7 Sanada-cho, Hachioji-shi, Tokyo

Claims (1)

[Claims] 1. A step (A) of mixing at least a low molecular weight material and a medium material to obtain a low molecular weight material-holding medium composite, and a step (B) of mixing the composite with at least a polymer material.
A method for producing a polymer composition comprising: a step (A), wherein the low molecular weight material is 5 × 10 ^{5 at} 100 ° C.
A low molecular weight compound having a viscosity of not more than centipoise, a difference in solubility parameter value between the low molecular weight material and the medium material of 3.0 or less, and a weight ratio of the low molecular weight material and the medium material of 1.0 or more. Shearing rate V = v / t (sec ⁻¹ ) [v
(M / sec): peripheral speed of rotation of rotor, t (m): clearance between fixed wall and rotor] under shearing conditions of 5.0 × 10 ² or more, the mixing temperature is set to the melting point of the medium material or the glass transition. The step of mixing at least two points to obtain a low molecular weight material-holding medium material composite having a medium material having a three-dimensional continuous network skeleton structure, and step (B) is the composite material, the low molecular weight material and the polymeric material. The difference in the solubility parameter value between the above is 4.0 or less, and the weight ratio of the low molecular weight material and the polymer material is 0.5 or more. ． p. m. so,
It is a step of mixing at a mixing temperature of 30 to 100 ° C.,
A method for producing a polymer composition, comprising both steps.