JP2023037609A - Resin composition and molding of the same - Google Patents

Abstract

To provide a resin composition in which a liquid functional agent having low thermal stability is stably kneaded to a thermoplastic resin, and a molding which prevents quick bleeding and can continuously exhibit a specific function derived from the liquid functional agent.SOLUTION: A resin composition contains a liquid functional agent (excluding copolymer containing alkylene oxide and softening agent for hydrocarbon-based rubber) which is liquid at 90°C and atmospheric pressure, a copolymer containing an alkylene oxide, and a thermoplastic resin which has no compatibility with the copolymer containing the alkylene oxide and has a melting point or a softening point of 100°C or lower.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a resin composition in which a liquid is kneaded into a thermoplastic resin under low-temperature kneading conditions (for example, kneading at 100° C. or less), and a molded article thereof.

Conventionally, a method of kneading a liquid functional agent into a thermoplastic resin to form a molding and slowly releasing the functional agent to exhibit a specific function has been widely used. For example, in thermoplastic elastomer resins and polyvinyl chloride resins, a method of kneading liquid oil as a plasticizer is used. The oil is gradually released from the resin molding into which the oil is kneaded, so that the molding can exhibit a specific function.

In addition, a method of kneading a specific block polymer and a liquid compound (organic liquid or aqueous solution) into a general-purpose polyolefin resin (for example, Patent Document 1), and a method of kneading a liquid functional agent using two types of thermoplastic polymers. (For example, Patent Document 2) has been proposed.

Japanese Patent No. 3963941 Japanese Patent No. 4576479

Here, some liquid functional agents have low thermal stability and low boiling points, and if these are kneaded under high temperature conditions, the liquid functional agents may thermally decompose or transpire to a large extent. , there was a problem that the process loss increased.

In particular, when the liquid functional agent is an aqueous solution, it must be kneaded at a temperature below the boiling point of water (100°C). It has been difficult to realize a resin composition that can be maintained without

In addition, as a technique for retaining an aqueous solution in a resin, highly water-absorbing polymers such as sodium acrylate, polyvinyl alcohol, and polyethylene glycol are widely used, but these retain an aqueous solution by swelling with water absorption. An aqueous solution is not kneaded by melt-kneading. Therefore, in this case, the resin expands when it absorbs water, and shrinks as the water evaporates, so there is a problem that it cannot be applied to applications that require the maintenance of a desired shape.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a resin composition in which a liquid functional agent with low thermal stability is stably kneaded into a thermoplastic resin, Another object of the present invention is to provide a molded article that is free from rapid bleeding and can continuously exhibit a specific function derived from a liquid functional agent.

The present inventors have completed the present invention as a result of intensive studies to solve the above problems. That is, the present invention provides the following preferred aspects.

[1] A liquid functional agent that is liquid at normal pressure and 90°C (excluding copolymers containing alkylene oxide and softeners for hydrocarbon rubber), a copolymer containing alkylene oxide, and alkylene oxide and a thermoplastic resin having a melting point or softening point of 100° C. or less, which is incompatible with a copolymer containing

[2] The resin composition according to [1] above, which has a continuous phase containing the thermoplastic resin and a discontinuous phase containing the copolymer containing the alkylene oxide.

[3] The resin composition according to [1] or [2] above, wherein the content of the liquid functional agent is 1 to 40% by mass with respect to the entire resin composition.

[4] The resin composition according to any one of [1] to [3], wherein the content of the alkylene oxide-containing copolymer is 1 to 40% by mass with respect to the entire resin composition.

[5] The resin composition according to any one of [1] to [4], which has a moisture content of 2 to 30% by mass.

[6] 50 to 100% by mass of the thermoplastic resin has a weight average molecular weight of 200,000 or less, and is mainly composed of at least two vinyl aromatic compound-based polymer blocks A and at least one conjugated diene compound. A composition comprising 100 parts by mass of a block copolymer (a) obtained by hydrogenating a block copolymer consisting of a polymer block B and a hydrocarbon rubber softener (b) of 50 to 300 parts by mass The resin composition according to any one of [1] to [5] above.

[7] A molded article comprising the resin composition according to any one of [1] to [6].

[8] The above [7], which is a molded product selected from the group consisting of fishing tackle, functional agent sustained release resin ball, copper ion sustained release sheet, stationery with grip containing natural fragrance, tool, and handle. Moldings as described.

According to the present invention, it is possible to provide a resin composition in which a liquid functional agent with low thermal stability is stably kneaded into a thermoplastic resin. In addition, it is possible to provide a molded article that is free from rapid bleeding and is capable of continuously exhibiting a specific function derived from the liquid functional agent.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram for demonstrating the resin composition which concerns on embodiment of this invention. 1 is a scanning electron microscope (SEM) photograph showing the state of the resin composition of Example 1. FIG.

The present invention will be described in detail below. The resin composition of the present invention comprises a liquid functional agent (excluding a copolymer containing alkylene oxide and a softening agent for hydrocarbon rubber) that is liquid at 90° C. under normal pressure, and a copolymer containing alkylene oxide. It contains coalescence and a thermoplastic resin which is incompatible with the copolymer containing alkylene oxide and has a melting point or softening point of 100° C. or lower.

<Liquid functional agent>
The liquid functional agent to be kneaded into the resin composition of the present invention must be liquid at normal pressure and 90°C. If the liquid functional agent becomes a gas at normal pressure and 90° C., it is not preferable because the amount of transpiration increases in the kneading step described below. Therefore, if the liquid functional agent is liquid at normal pressure and 90° C., it can be kneaded without causing the above-mentioned problems. be possible. The boiling point of the liquid functional agent is preferably 90° C. or higher.

In addition, since the resin composition of the present invention contains a thermoplastic resin having a melting point or softening point of 100°C or less, it can be melt-kneaded at a relatively low temperature of 100°C or less. It is suitable for kneading a liquid functional agent containing a component with low heat resistance that tends to thermally decompose or change in quality due to heat at a temperature higher than 1, or a component that easily evaporates due to heat.

For example, the present invention can be suitably used for kneading oil or aqueous solution containing protein or amino acid with low heat resistance. In addition, natural fragrances, essential oils, phytoncide, etc., which contain many ingredients, may change their composition before and after heating if the low-boiling-point ingredients evaporate due to heat treatment, resulting in a change in fragrance. Since low-temperature kneading is used in the present invention, the change can be suppressed.

Liquid functional agents include various oils, aqueous solutions containing solutes, O/W emulsions in which oils are dispersed in water using surfactants, and W/W emulsions in which water is dispersed in oil using surfactants. O emulsions, water-based slurries with dispersed microparticles, oil-based slurries, and the like can also be used.

The term "melting point" as used herein means an endothermic peak of melting when measured with a differential scanning calorimeter (DSC).

The term "softening point" as used herein refers to the Vicat softening temperature obtained by measurement according to JIS K7206:2016.

The content of the liquid functional agent with respect to the entire resin composition of the present invention is in the range of 1 to 40% by mass, preferably in the range of 5 to 20% by mass, and can be appropriately selected depending on the purpose. . If the content of the liquid functional agent is less than the above lower limit, the intended function may not be exhibited. Moreover, when the content of the liquid functional agent exceeds the above upper limit, there is a strong tendency that the molded article lacks shape retention.

<Copolymer containing alkylene oxide>
Copolymers containing alkylene oxides are polymers obtained by polymerization of alkylene oxides such as ethylene oxide, and copolymers containing various alkylene oxides can be used in the present invention.

More specifically, for example, modified polyalkylene oxides such as nonionic polyalkylene oxide water absorbent resins, random copolymers of allyl glycidyl ether, ethylene oxide and propylene oxide (ethylene oxide, propylene oxide, allyl glycidyl ether random copolymers) and other copolymers containing ethylene oxide.

Examples of nonionic polyalkylene oxide-based water absorbent resins include commercially available products such as Aquacok TWB manufactured by Sumitomo Seika Co., Ltd., and copolymers containing ethylene oxide include Alcox CP manufactured by Meisei Chemical Industry Co., Ltd. -A1H and Alcox CP-A2H.

In addition, in the copolymer containing alkylene oxide, part or all of the terminals or side chains of the alkylene oxide may be substituted with various modifying groups.

The copolymer containing alkylene oxide preferably has a molecular weight of 1000 to 10 million, more preferably 10000 to 1 million.

The content of the alkylene oxide-containing copolymer relative to the entire resin composition of the present invention is preferably 1 to 40% by mass, more preferably 3 to 20% by mass. If the content of the alkylene oxide-containing copolymer is less than the above lower limit, particularly in the case of kneading an aqueous solution, the amount of water that can be contained is small, and sufficient functions cannot be exhibited, which is not preferable. On the other hand, if the content of the copolymer containing alkylene oxide exceeds the above upper limit, the formation of a continuous phase from the main thermoplastic resin will not be possible, and the shape retention property will tend to be lacking, which is not preferable.

<Thermoplastic resin>
In the present invention, the resin that is the main component of the resin composition can be selected from various thermoplastic resins that are melt-kneadable at 100° C. or lower and are incompatible with the copolymer containing alkylene oxide.

Thermoplastic resins used in the present invention include, for example, styrene thermoplastic elastomers, acrylic thermoplastic elastomers, thermoplastic elastomers blended with these, thermoplastic elastomer compounds containing these as main components (e.g., styrene thermoplastic elastomers styrene-based thermoplastic elastomer compounds containing mainly), resins having a melting point of 100 ° C. or less (polycaprolactone, modified polyethylene, modified polypropylene, resins containing these, and compounds containing these mainly). can.

Commercially available thermoplastic resins can be used. For example, Kuraray Plastics' thermoplastic elastomer compound (trade name: Erneston (registered trademark) JS20N), Daicel's biodegradable polycaprolactone (trade name: Plaxel), and Mitsui Chemicals' recycled modified Modified polyethylene and modified polypropylene (trade name: Tafmer) for use in hot-melt resins, Idemitsu Kosan Co., Ltd.'s modified polyethylene (trade name: Elmodu) for hot-melt, etc. Among them, thermoplastic elastomer compounds are preferred.

As the thermoplastic elastomer compound, for example, 50 to 100% by mass has a weight average molecular weight of 200,000 or less, and polymer block A mainly composed of at least two vinyl aromatic compounds and at least one conjugated diene compound. A composition comprising 100 parts by mass of a block copolymer (a) obtained by hydrogenating a block copolymer consisting of a polymer block B and 50 to 300 parts by mass of a softener for hydrocarbon rubber (b) can be used.

<Block copolymer (a)>
The block copolymer (a) is a hydrogenated block copolymer composed of polymer block A composed mainly of at least two vinyl aromatic compounds and polymer block B composed of at least one conjugated diene compound. It is obtained by

Examples of vinyl aromatic compounds include styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, 1,3-dimethylstyrene, vinylnaphthalene and vinylanthracene. Among these, styrene and α-methylstyrene are preferred. An aromatic vinyl compound may be used individually by 1 type, and may use 2 or more types together.

The content of the vinyl aromatic compound in the block copolymer (a) is preferably 5 to 75% by mass, more preferably 5 to 50% by mass.

Examples of the conjugated diene compound include butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, and 1,3-hexadiene. Conjugated diene compounds may be used singly or in combination of two or more. Among these, the conjugated diene compound is preferably at least one selected from isoprene and butadiene, more preferably a mixture of isoprene and butadiene.

In the block copolymer (a), 50% or more of the carbon-carbon double bonds derived from the conjugated diene compound of the polymer block B are preferably hydrogenated, and 75% or more are hydrogenated. is more preferred, and it is particularly preferred that 95% or more is hydrogenated.

The block copolymer (a) may contain at least one polymer block A and at least one polymer block B, but from the viewpoint of heat resistance, mechanical properties, etc., two or more polymer blocks A may be contained. , the polymer block B preferably contains one or more. The bonding mode of polymer block A and polymer block B may be linear, branched, or any combination thereof. , Triblock structures represented by ABA, and multi-block copolymers represented by (AB)n, (AB)nA, (where n represents an integer of 2 or more) etc. can be mentioned. Among these, those having a triblock structure represented by ABA are particularly preferred in terms of heat resistance, mechanical properties, handleability and the like.

The weight average molecular weight of the block copolymer (a) is preferably in the range of 40,000 to 500,000. If the molecular weight is too smaller than the above range, the mechanical properties of the resulting composition are unfavorably lowered. On the other hand, if it is too large, the viscosity will increase significantly, and the moldability will be impaired, which is not preferable.

Further, 50 to 100% by mass of the block copolymer (a) preferably has a weight average molecular weight of 200,000 or less, and 80 to 100% by mass preferably has a weight average molecular weight of 200,000 or less.

In addition, the weight average molecular weight as used in this specification means the weight average molecular weight of standard polystyrene conversion calculated|required by the gel permeation chromatography (GPC) measurement.

Measurement condition:
GPC; LC Solution (manufactured by SHIMADZU)
Detector: Differential refractometer RID-10A (manufactured by SHIMADZU)
Column: Two TSKgelG4000Hxl in series (manufactured by TOSOH)
Guard column: TSKguardcolumnHxl-L (manufactured by TOSOH)
Solvent: Tetrahydrofuran Temperature: 40°C
Flow rate: 1ml/min
Concentration: 2mg/ml

<Softening agent for hydrocarbon rubber (b)>
Examples of the hydrocarbon-based rubber softening agent (b) include process oils such as paraffinic oils, naphthenic oils, aromatic oils, and liquid paraffins. Among them, process oils such as paraffinic oils and naphthenic oils. is preferred. These may be used individually by 1 type, and may use 2 or more types together.

The thermoplastic elastomer compound used in the present invention preferably contains 50 to 300 parts by mass of the softener for hydrocarbon rubber (b) with respect to 100 parts by mass of the block copolymer (a). It is preferably 60 to 200 parts by mass, more preferably 60 to 150 parts by mass.

Further, the "thermoplastic resin incompatible with a copolymer containing alkylene oxide" as used herein means that, as shown in FIG. A thermoplastic resin that has a clear boundary with a copolymer containing an oxide. In FIG. 1, the thermoplastic resin has a structure in which the continuous phase is formed and the alkylene oxide-containing copolymer forms the discontinuous phase. Since the thermoplastic resin forms a continuous phase in the resin composition, the molded article made of the resin composition of the present invention can have the strength necessary to maintain a certain shape.

In the resin composition of the present invention, when the liquid functional agent has an affinity for the copolymer containing alkylene oxide rather than the thermoplastic resin, the liquid functional agent is a copolymer containing alkylene oxide. It is contained in the interior and in the boundary between the thermoplastic resin and the alkylene oxide-containing copolymer. In addition, when the liquid functional agent has more affinity for the thermoplastic resin than the copolymer containing alkylene oxide, the liquid functional agent can be used in the interior of the thermoplastic resin and in the copolymer containing the thermoplastic resin and the alkylene oxide. It will be included in the boundary part with coalescence. Further, when the liquid functional agent does not have an affinity for the copolymer containing the thermoplastic resin and the alkylene oxide, the liquid functional agent is used at the interface between the thermoplastic resin and the copolymer containing the alkylene oxide. will be included in

The copolymer containing alkylene oxide used in the present invention is known as a water-swellable polymer that is highly hydrophilic and absorbs water. The present invention utilizes this property, and an aqueous solution or similar highly polar liquid functional agent containing alkylene oxide is added to a hydrophobic thermoplastic resin that is incompatible with a copolymer containing alkylene oxide. By kneading with the containing copolymer, it becomes possible to knead the liquid functional agent at a high concentration into the thermoplastic resin.

When the liquid functional agent has an affinity for the copolymer containing alkylene oxide rather than the thermoplastic resin, the liquid functional agent kneaded into the copolymer containing alkylene oxide has affinity. In addition to being incorporated, it is also arranged and held at the interface between the hydrophobic thermoplastic resin, which is the main resin, and the copolymer particles containing the alkylene oxide dispersed therein, so that the surface of the resin pellet or molded product. Moreover, it is possible to obtain a resin composition containing a high-concentration liquid functional agent that does not cause rapid bleeding of the liquid functional agent.

<Resin composition>
When an aqueous solution is used as the liquid functional agent, the water content of the entire resin composition is preferably 2 to 30% by mass, more preferably 5 to 20% by mass. If the water content is less than the above lower limit, the amount of aqueous solution that can be contained is small, and sufficient functions cannot be exhibited, which is not preferable. Moreover, when the moisture content exceeds the above upper limit, the aqueous solution tends to bleed onto the surface of the molded article.

(Manufacturing method of compact)
Next, a method for producing a molded article using the resin composition of the present invention will be described.

The molded article of the present invention can be produced using the resin composition of the present invention by known molding methods such as injection molding, extrusion molding, blow molding, film molding, and melt spinning.

First, a copolymer containing a thermoplastic resin and an alkylene oxide and a liquid functional agent are kneaded in a predetermined ratio at a predetermined temperature using a twin-screw kneader or the like, and the liquid functional agent is added during this kneading. By kneading, a resin composition containing an alkylene oxide-containing copolymer and a liquid functional agent is produced. The method for kneading the copolymer containing alkylene oxide and the liquid functional agent into the thermoplastic resin is not particularly limited, and any known method can be used.

Moreover, the temperature at the time of melt-kneading is preferably above the melting point or softening point of the thermoplastic resin and below 100°C. If the temperature is less than the above lower limit, unmelted matter may occur in the resin composition. On the other hand, if the temperature exceeds the above upper limit, the evaporation of water and low-boiling point components increases, which is not preferable.

Next, using the produced resin composition, for example, the molded article of the present embodiment is produced by injection molding.

The molded article of the present embodiment can be used as a molded article that slowly releases a liquid functional agent with low thermal stability. It can be suitably used for applications such as stationery with grips containing natural fragrances, tools, and handles.

The present invention will be described below based on examples. In addition, the present invention is not limited to these examples, and these examples can be modified and changed based on the spirit of the present invention, and they are excluded from the scope of the present invention. isn't it.

(Example 1)
A styrenic thermoplastic elastomer compound (manufactured by Kuraray Plastics Co., Ltd., trade name: Arneston (registered trademark) JS20N), a copolymer containing alkylene oxide (manufactured by Sumitomo Seika Co., Ltd., trade name: Aquacoke TWB), and isobutylene/anhydrous A maleic acid copolymer neutralized aqueous solution (a 20% aqueous solution of Isoban 600 manufactured by Kuraray Co., Ltd. with a neutralization degree of 0.6 with NaOH) was blended at a mass ratio of 60/20/20, and melt-kneaded at 90 ° C. Under the conditions, normal twin-screw kneading was performed to obtain a resin composition.

In the melt-kneading step, evaporation of water was not particularly observed, and the resin composition was free from stickiness due to the aqueous solution (stickiness due to rapid bleeding). Moreover, no particular change was observed with respect to the liquid functional agent.

Further, the water content of the resin composition was measured by calculating the weight loss after 24 hours of treatment in a hot air circulating furnace set at 100° C. and found to be 18%.

A scanning electron microscope (SEM) photograph showing the state of the resin composition of this example is shown in FIG. As shown in FIG. 2, in the resin composition of this example, there is a clear boundary between the styrene-based thermoplastic elastomer and the copolymer containing alkylene oxide, and the styrene-based thermoplastic elastomer It can be seen that the resin is incompatible with the copolymer containing alkylene oxide.

Next, in injection molding, the resin composition is injection molded under the conditions of a cylinder temperature of 90°C, a mold temperature of 50°C, and a molding pressure of 600 kgf/cm ² to form a ball-shaped molding with a diameter of 3 cm. Obtained. When this was put into the water absorption tank of the humidifier and the humidifier was operated, the neutralized copolymer of isobutylene and maleic anhydride with COOH ends was eluted into the water, taking in Ca ions and Mg ions in the water. Thus, it was confirmed that the generation of scale composed of Ca carbonate and Mg carbonate, which tends to occur in humidifier filters, can be suppressed.

(Example 2)
A styrene-based thermoplastic elastomer compound (manufactured by Kuraray Plastics Co., Ltd., trade name: Arneston (registered trademark) JS20N) and a copolymer containing alkylene oxide (manufactured by Sumitomo Seika Co., Ltd., trade name: Aquacoke TWB) and an aqueous solution of phytoncide ( Phytoncide Japan Co., Ltd., trade name: PT150) were blended at a mass ratio of 50/25/25, and normal twin-screw kneading was performed under melt-kneading conditions of 90°C to obtain a resin composition.

In the melt-kneading step, evaporation of water was not particularly observed, and the resin composition was free from stickiness due to the aqueous solution (stickiness due to rapid bleeding). Moreover, no particular change was observed with respect to the liquid functional agent.

Moreover, when the water content of the resin composition was measured by the same method as in Example 1, it was 22%.

Next, injection molding of the resin composition was performed at 90° C. to prepare a plate of 10 cm×10 cm and 5 mm in thickness. The plate was not sticky and had a moist feel.

Next, in accordance with the film adhesion method in JIS Z 2801.2010-5, when the antibacterial properties of Staphylococcus aureus were evaluated, the antibacterial activity value after 24 hours showed a value higher than 3.2, indicating good antibacterial properties. It was confirmed that the

(Example 3)
A styrenic thermoplastic elastomer compound (manufactured by Kuraray Plastics Co., Ltd., trade name: Arneston (registered trademark) JS20N) and a copolymer containing alkylene oxide (manufactured by Meisei Chemical Industry Co., Ltd., trade name: Alcox CP-A1H) and hinokitiol (manufactured by Kiseitec Co., Ltd., trade name: Aomori Viva Essential Oil) were blended at a mass ratio of 80/10/10, and normal twin-screw kneading was performed under melt-kneading conditions of 90° C. to obtain a resin composition.

In the melt-kneading step, transpiration of hinokitiol was not particularly observed, and the resin composition was free from stickiness caused by the aqueous solution (stickiness caused by rapid bleeding). Moreover, there was no change in fragrance before and after kneading, and no particular change was observed with respect to the liquid functional agent.

Next, injection molding of the resin composition was performed at 90° C. to prepare a plate of 10 cm×10 cm and 5 mm in thickness. The plate was not sticky.

Next, when the antibacterial properties of Staphylococcus aureus were evaluated in accordance with the film adhesion method in JIS Z 2801.2010-5, the antibacterial activity value after 24 hours showed a value higher than 4.9, indicating a good antibacterial property. It was confirmed that the

Furthermore, JIS Z 2911:2018. Annex A (normative) When the method A in the plastic product test was applied mutatis mutandis to confirm the resistance to six types of mixed mold, the level was "0", confirming that it has good antifungal performance.

(Example 4)
A styrene-based thermoplastic elastomer compound (manufactured by Kuraray Plastics Co., Ltd., trade name: Arneston (registered trademark) JS20N) and a copolymer containing alkylene oxide (manufactured by Sumitomo Seika Co., Ltd., trade name: Aquacork TWB) and soak oil ( Norries Co., trade name: Bite Bath Liquid Shrimp) were blended at a mass ratio of 60/20/20, and normal twin-screw kneading was performed under melt-kneading conditions of 90° C. to obtain a resin composition.

In the melt-kneading step, no particular oil evaporation was observed, and the resin composition was free from stickiness (stickiness due to rapid bleeding). Moreover, there was no change in fragrance before and after kneading, and no particular change was observed with respect to the liquid functional agent.

Next, a lure base for bass was molded at 90° C., a hook and accessories were attached to the base to form a lure, and bass fishing was evaluated. Even when used repeatedly, the scent of Bite Bath Liquid Shrimp persists, and the copolymer containing alkylene oxide that is kneaded absorbs water, so the entire lure absorbs water and swells, allowing for smooth movement. As a result, good fishing results were obtained.

(Example 5)
Copolymer containing modified polyethylene (manufactured by Mitsui Chemicals, trade name: Tafmer H-10305) and alkylene oxide (manufactured by Sumitomo Seika, trade name: Aquacoke TWB) and Bordeaux liquid (manufactured by Inoue Lime Industry Co., Ltd., trade name: CI Bordeaux 66D, an aqueous dispersion containing lime and copper) were blended at a mass ratio of 60/20/20, and normal twin-screw kneading was performed under melt-kneading conditions at 90 ° C. to obtain a resin composition. .

In the melt-kneading step, evaporation of water was not particularly observed, and the resin composition was free from stickiness due to the aqueous solution (stickiness due to rapid bleeding). Moreover, no particular change was observed with respect to the liquid functional agent.

Moreover, when the water content of the resin composition was measured by the same method as in Example 1, it was 12%.

Next, the resin composition was extruded at 90° C. to prepare a mesh, and the outflow amount of copper ions was measured and tracked during outdoor exposure. . Therefore, it has been confirmed that this mesh is effective as a tool that can demonstrate the sterilization effect of copper ions for a long period of time without causing the risk of phytotoxicity due to rapid outflow of copper ions by covering fruit trees, etc. did it.

(Comparative example 1)
In Example 1, a styrene-based thermoplastic elastomer compound (manufactured by Kuraray Plastics Co., Ltd., trade name: Erneston (registered trademark) JS20N) and an aqueous solution of isoban (manufactured by Kuraray Co., Ltd.) were mixed without blending a copolymer containing alkylene oxide. 20% aqueous solution with a neutralization degree of 0.6 with NaOH of 600) was blended at a mass ratio of 80/20, and normal twin screw kneading was performed under melt-kneading conditions of 90 ° C. A kneaded product could not be obtained due to stickiness due to rapid bleeding.

(Comparative example 2)
The styrenic thermoplastic elastomer compound (manufactured by Kuraray Plastics Co., Ltd., trade name: Erneston (registered trademark) JS20N) in Example 3 was changed to linear low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., trade name: Novatec LL UJ580). However, when a resin composition was prepared in the same manner as in Example 3 except that normal twin-screw kneading was performed under melt-kneading conditions of 160 ° C., the kneaded product turned black, and the scent changed.

As explained above, the present invention is particularly useful for a resin composition in which a liquid is kneaded into a thermoplastic resin under low-temperature kneading conditions, and a molded article thereof.

Claims (8)

Liquid functional agents (excluding copolymers containing alkylene oxides and softeners for hydrocarbon-based rubbers) that are liquid at 90° C. under normal pressure, copolymers containing alkylene oxides, and copolymers containing alkylene oxides. A resin composition comprising a polymer and a thermoplastic resin which is incompatible and has a melting point or softening point of 100° C. or less. 2. The resin composition according to claim 1, wherein the resin composition has a continuous phase containing the thermoplastic resin and a discontinuous phase containing the copolymer containing the alkylene oxide. 3. The resin composition according to claim 1, wherein the liquid functional agent has a content of 1 to 40% by mass with respect to the entire resin composition. 3. The resin composition according to claim 1, wherein the content of the copolymer containing alkylene oxide with respect to the entire resin composition is 1 to 40% by mass. 3. The resin composition according to claim 1, wherein the water content is 2 to 30% by mass. 50 to 100% by mass of the thermoplastic resin has a weight average molecular weight of 200,000 or less, and at least two polymer blocks A mainly composed of a vinyl aromatic compound and at least one polymer block mainly composed of a conjugated diene compound. A composition comprising 100 parts by mass of a block copolymer (a) obtained by hydrogenating a block copolymer comprising a coalesced block B, and 50 to 300 parts by mass of a softener for hydrocarbon rubber (b). The resin composition according to claim 1 or 2. A molded article comprising the resin composition according to claim 1 or 2. 8. The molded article according to claim 7, which is one type of molded article selected from the group consisting of fishing tackle, functional agent sustained release resin ball, copper ion sustained release sheet, stationery with grip containing natural fragrance, tool, and handle. .

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