JP2018024874A - Propylene resin composition, sanitary item, door member, handrail member, tableware and serving tray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition with which a film, a molding and the like having excellent antibacterial effect, high glossiness, and excellent in feelings of touch and texture, can be easily formed.SOLUTION: A propylene resin composition contains a propylene resin, sedimentary barium sulfate with an average particle size of 0.1-10 μm, and burned shell hydrate with an average particle size of 0.1-30 μm, and has antibacterial properties.SELECTED DRAWING: None

Description

  The present invention relates to a propylene-based resin composition, a sanitary article, a door member, a handrail member, tableware, and a serving tray.

  Articles such as sanitary goods, door members, handrail members and tableware such as table trays are articles that come into direct contact with human hands and bodies, and bacteria based on human hands and bodies adhere to such articles. However, there is a problem that it is easy to multiply. For this reason, efforts have been made to impart antibacterial properties to such articles by various methods. For example, antibacterial products containing silver antibacterial agents have been proposed because of their high antibacterial effects. .

  However, products containing silver antibacterial agents tend to damage the surface appearance such as coloring and discoloration, and when used in resin products, the deterioration of the resin tends to occur and the price tends to increase. It was in.

  Therefore, from the viewpoint of being inexpensive and excellent in antibacterial effect, research has been conducted on products in which shell baked and hydrated shell hydrate is blended as an antibacterial agent (Patent Documents 1 and 2).

JP 2010-65215 A International Publication No. 2004/89092

  As a result of intensive studies by the present inventor, the antibacterial product described in Patent Documents 1 and 2 has insufficient antibacterial effect, and such an antibacterial product contains surface glossiness, touch and touch. The feeling was not good.

  The present invention has been made in view of the above problems, and provides a composition that can easily form a film or a molded article having excellent antibacterial effect, high gloss, good touch and feel, and the like. Objective.

As a result of intensive studies to solve the above problems, the present inventor has found that the following problems can be solved by the following composition, and has completed the present invention.
A configuration example of the present invention is as follows.

[1] Propylene having antibacterial properties, comprising a propylene-based resin, precipitated barium sulfate having an average particle size of 0.1 to 10 μm, and shell baked hydrate having an average particle size of 0.1 to 30 μm -Based resin composition.
[2] The composition according to [1], wherein the content of precipitated barium sulfate is 1 to 85% by weight.
[3] The composition according to [1] or [2], wherein the ratio of the total weight of the propylene-based resin and precipitated barium sulfate to the shell baked hydrate is in the range of 5 to 500.
[4] The composition according to any one of [1] to [3], further comprising a calcined hydrate of dolomite.
[5] A sanitary article, door member, handrail member, tableware or serving tray obtained using the composition according to any one of [1] to [4].

  According to the present invention, it is possible to easily form a film or a molded article having an excellent antibacterial effect, a high glossiness, and a good touch and feel. In particular, according to the present invention, while maintaining or improving the physical properties of the resin, it is highly glossy, excellent in touch and feel, and has a film and molding having an antibacterial property higher than that obtained when a shell hydrate is simply added. The body, specifically, articles such as sanitary goods, door members, handrail members, and tableware such as serving trays can be easily formed.

≪Antimicrobial resin composition≫
The antibacterial resin composition according to the present invention (hereinafter also referred to as “the present composition”) has a propylene resin, precipitated barium sulfate having an average particle diameter of 0.1 to 10 μm, and an average particle diameter of 0.1. And 1 to 30 μm of shell baked hydrate.
According to such a composition, the reason for the above effect is not necessarily clear, but the calcined shell hydrate having an average particle diameter in a specific range is a precipitated barium sulfate having an average particle diameter in a specific range. Depending on the physical properties of the propylene resin as a resin component, the speed of movement to the surface of a film or molded article is appropriately adjusted, thereby providing an enhanced antibacterial effect than when simply adding shell baked hydrate. It is considered that the antibacterial effect is exhibited over a long period of time.

According to the present composition, it is possible to obtain a film or a molded body having a high gloss and a moist feeling that can be clearly seen at the moment of touching, which cannot be achieved by conventional resin products. Therefore, in particular, it can be suitably used as a material for articles that come into contact with human hands and skin, specifically, sanitary goods, door members, handrail members, and dishes such as serving trays.
In addition, according to the present invention, it is possible to easily obtain a film or a molded article having an effect of suppressing the generation of mold and having a deodorizing effect on compounds such as acetic acid, hydrogen sulfide, acetaldehyde, and the smell of tobacco. It is considered possible. Therefore, the present composition can be suitably used for sofas and beds.

The present composition may be a composition for forming a film, a molded body or the like (hereinafter also referred to as “molding composition”), or may be a so-called master batch.
The master batch generally refers to a pellet in which a solid component is contained in a base resin such as a propylene resin at a high concentration. Although various resins can be used as the base resin, it is preferable to use a propylene resin as the base resin in the present invention. The solid component content in the masterbatch is usually in the range of 45 to 85% by weight, preferably 50 to 80% by weight.
Thus, a masterbatch containing a solid component at a high concentration in a propylene-based resin has a stable solid component (such as precipitated barium sulfate and shell baked hydrate) contained in the composition. Therefore, a film or a molded body in which precipitated barium sulfate, baked shell hydrate and the like are uniformly dispersed can be easily obtained with high cost performance.

  The masterbatch is usually diluted with a component containing a propylene-based resin (hereinafter, the component that dilutes the masterbatch is also referred to as “diluted component”). Specifically, the weight of the masterbatch and the weight of the diluted component And the ratio (weight of the master batch: weight of the diluted component) is preferably 1: 1 to 10, more preferably 1: 1 to 5, diluted with the diluted component. The composition is diluted with a diluting component so as to have a content in the following molding composition to form a film or a molded body.

<Propylene-based resin>
In the present composition, a propylene-based resin is used as the resin component.
By using a propylene-based resin, a composition having the above effects can be obtained for the first time.
Propylene-type resin may be used individually by 1 type, and may use 2 or more types.

  The propylene-based resin may be any one of a propylene homopolymer, a block copolymer, and a random copolymer. From the viewpoint of rigidity and heat resistance of a film or a molded body obtained from the present composition, propylene resin may be used. A homopolymer is preferable, and a block copolymer is preferable from the viewpoint of impact resistance of a film or a molded body obtained from the present composition, and a block copolymer is more preferable in the present composition.

The copolymer can be obtained by copolymerizing propylene and a comonomer copolymerizable with propylene. Examples of the comonomer include olefins such as ethylene, butene, pentene, hexene, and octene, and (meth) acrylic acid. , Ethylenically unsaturated carboxylic acids such as fumaric acid and acid anhydrides thereof, and the like, preferably ethylene or 1-butene.
Two or more of these comonomers may be used.
The amount of the comonomer used is usually 30% by weight or less, preferably 20% by weight or less, based on 100% by weight of the total monomers used for the synthesis of the copolymer.

The propylene resin is polyethylene, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-pentene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, propylene-butene copolymer, Other polymers such as α-olefin copolymers such as propylene-hexene copolymer, propylene-octene copolymer, butene-hexene copolymer, butene-octene copolymer, hexene-octene copolymer, etc. The other polymer may include ethylene / propylene rubber (EPR), modified ethylene / propylene / diene rubber (modified EPDM) and hydrogenated styrene-based thermoplastic from the viewpoint of improving impact resistance. Elastomers such as elastomer (SEBS) are preferred.
The blending amount of the other polymer is usually 40% by weight or less, preferably 30% by weight or less with respect to 100% by weight of the propylene resin.

  The propylene-based resin may be synthesized by a conventionally known method, or a commercially available product such as Prime Polymer Co., Ltd., Nippon Polypro Co., Ltd., Sumitomo Chemical Co., Ltd. or Sun Allomer Co., Ltd. may be used. Good.

  The propylene resin has a melt flow rate (MFR) measured at a temperature of 230 ° C. and a load of 2.16 kgf based on JIS K 7210, whereby a composition having excellent processability and moldability is obtained, and the antibacterial effect is enhanced. From the point that a film or a molded product can be easily obtained, it is preferably 0.5 to 70 g / 10 minutes, more preferably 5 to 50 g / 10 minutes, and particularly preferably 10 to 40 g / 10 minutes. From the viewpoint that a composition excellent in processability and moldability can be obtained and a molded article such as an injection molded article with enhanced antibacterial effect can be easily obtained, preferably 5 to 50 g / 10 min, more preferably Is 10 to 40 g / 10 min.

The Izod impact strength (23 ° C.) of the propylene-based resin measured based on ASTM-D256 is preferably from the viewpoint that a molded product such as an injection molded product having excellent impact resistance can be easily obtained. It is 2-20 kJ / m < ² >, More preferably, it is 5-20 kJ / m < ² >.

  The bending elastic modulus of the propylene-based resin measured based on ASTM-D790 is preferably 1000 to 3000 MPa from the viewpoint that a molded product such as an injection molded product having excellent mechanical strength can be easily obtained. .

The content of the propylene-based resin in the composition may be appropriately selected according to a desired application, but is preferably 10 to 98% by weight, more preferably 15 to 90% by weight with respect to 100% by weight of the composition. It is. Specifically, when the present composition is a molding composition, the content of the propylene-based resin is preferably 55 to 98% by weight, more preferably 60 to 90% by weight with respect to 100% by weight of the present composition. The lower limit is preferably 65% by weight or 70% by weight, and when the composition is a masterbatch, the content of the propylene-based resin is 100% by weight of the composition. Preferably it is 10 to 80 weight%, More preferably, it is 15 to 70 weight%, Most preferably, it is 20 to 70 weight%.
When the content of the propylene resin is in the above range, a composition excellent in processability and moldability is obtained, and a film or a molded body in which the resin characteristics are sufficiently exhibited and the antibacterial effect is enhanced is easily obtained. It is possible to easily obtain a film, a molded body or the like that exhibits an antibacterial effect stably over a long period of time.

<Precipitated barium sulfate>
The composition comprises precipitated barium sulfate having an average particle size in a specific range.
By including such precipitated barium sulfate, it is possible to easily obtain a film or a molded body having a good balance of antibacterial effect, touch / feel, rigidity, heat resistance and surface smoothness and having a high surface gloss. In addition, the mechanical properties (tensile strength, elongation, flexural modulus, flexural strength, Izod impact value and deflection temperature under load) of the propylene-based resin can be improved. In particular, since the present composition contains precipitated barium sulfate having an average particle size in a specific range, it has an antibacterial effect enhanced more than when the shell baked hydrate is simply blended, and the antibacterial effect is higher. Films and molded articles that can be exhibited over a long period of time can be easily obtained.
In addition, since precipitated barium sulfate is resistant to acids and alkalis, it is possible to obtain a film or a molded product that exhibits the above effects over a long period of time despite containing a strongly basic shell baked hydrate.
The said sedimentary barium sulfate may be used individually by 1 type, and may use 2 or more types from which a particle size etc. differ.

The precipitated barium sulfate is not particularly limited, and may be precipitated by adding a sodium sulfate solution to a barium sulfide solution obtained by reduction roasting of barite, and reacting barium sulfide with sulfuric acid or sulfate. It may be synthesized by.
Also, precipitated barium sulfate surface-treated by a conventionally known method can be used from the viewpoint of improving the affinity with the resin and the dispersibility.

The average particle diameter of the precipitated barium sulfate is a film or molding having a surface gloss that is excellent in processability and moldability, is excellent in masterbatch formability, is excellent in touch / feel and surface smoothness. From the point that a body etc. can be obtained easily, it is 0.1-10 micrometers, Preferably it is 0.5-3 micrometers.
The precipitated barium sulfate having the average particle diameter can be obtained by appropriately adjusting the conditions at the time of synthesis, and the precipitated barium sulfate obtained after the synthesis can be obtained by using a hammer mill, a roller mill, if necessary. It can be obtained by pulverizing with a ball mill, jet mill or the like, and classifying if necessary.
In addition, the average particle diameter in this invention means the volume average particle diameter (D50) measured by the laser diffraction method.

  The degree of whiteness measured by the Hunter method (JIS L 1015) of the precipitated barium sulfate can suppress discoloration based on the calcined shell hydrate, and can easily obtain a film or a molded body having a desired color. Therefore, it is preferably 90% or more, more preferably 95% or more.

The content of precipitated barium sulfate in the composition may be appropriately selected according to the desired application, but is preferably 1 to 85% by weight, more preferably 3 to 80% by weight with respect to 100% by weight of the composition. %. Specifically, when the present composition is a molding composition, the content of precipitated barium sulfate is preferably 1 to 40% by weight, more preferably 3 to 30% with respect to 100% by weight of the present composition. The upper limit is preferably 28% by weight, and when the composition is a masterbatch, the content of precipitated barium sulfate is preferably 100% by weight of the composition. It is 15 to 85% by weight, more preferably 20 to 80% by weight, particularly preferably 20 to 70% by weight.
When the content of precipitated barium sulfate is in the above range, a composition having excellent processability and moldability can be obtained, and the characteristics of the resin can be fully exerted, rather improved, antibacterial, hand / feel, and heat resistance. Further, it is possible to easily obtain a film or a molded body having excellent balance between surface smoothness and surface gloss.

<Shell fired hydrate>
The shell baked hydrate is not particularly limited as long as it is obtained by firing the shell and then hydrating it.
Since this composition contains a shell baked hydrate, the antibacterial effect is exhibited, and the odor caused by the resin or the like can be sufficiently suppressed (deodorized). Shell baked hydrates are preferred because they are safe, secure and environmentally friendly, and are less expensive than conventional antibacterial agents such as silver.
The shell baked hydrate may be used alone or in combination of two or more different shell types and particle sizes.

  The shell is not particularly limited and may be a natural shell or a cultured shell. Specifically, a shell such as a scallop shell, an oyster shell, a clam or a clam shell. , Abalone shell, Sazae shell, Akoya shell shell, Sea shell shell, etc. Scallop shells are preferred.

The shell baked hydrate can be produced by a conventionally known method. Specifically, after pulverizing the shell as necessary, it is 800 ° C. or higher, preferably 800 ° C. to 1500 ° C., more preferably 850. It can manufacture by baking after baking in air or carbon dioxide presence at a temperature of 1200 ° C. to 1200 ° C.
The firing time is appropriately set depending on the firing temperature or the like, but is usually 10 to 120 minutes, preferably 15 to 90 minutes after reaching the predetermined firing temperature.

  The shell baked hydrate may be left unreacted carbonate or the like after firing as long as it does not interfere with the effects of the present invention other than those obtained by completely oxidizing or hydrating the shell. Unreacted oxide or the like may remain even after hydration.

  The main component of the baked shell hydrate is calcium hydroxide (slaked lime), but the difference from industrially made slaked lime is that the shell is baked, so other than calcium hydroxide (slaked lime) It is the point which contains other components (for example, various mineral components, such as potassium and magnesium), As a result, it is thought that it has the characteristics that it is excellent in antibacterial property and its reactivity is low.

The average particle size of the shell baked hydrate is such that a composition having excellent processability and moldability is obtained, and a masterbatch formability is excellent, and a film or a molded article having a good feel and feel is easily formed. It is possible to obtain a film or a molded body exhibiting high antibacterial properties even with a small amount, and it is difficult to reduce the mechanical strength of a film or molded body obtained from a composition containing a propylene resin and precipitated barium sulfate. From this point, it is 0.1-30 micrometers, Preferably it is 0.1-10 micrometers, More preferably, it is 0.5-5 micrometers.
When the average particle diameter of the shell baked hydrate is too small, the shell baked hydrate tends not to be easily dispersed in the resin, and sufficient antibacterial performance may not be obtained. On the other hand, when the average particle diameter of the shell baked hydrate is too large, the specific surface area of the shell baked hydrate becomes small, and sufficient antibacterial performance may not be obtained.
The shell baked hydrate having such an average particle size is obtained by pulverizing the hydrate after hydration with a hammer mill, a roller mill, a ball mill, a jet mill or the like, if necessary, and classifying as necessary. Can be obtained.

The content of the baked shell hydrate in the composition may be appropriately selected according to the desired application, but is preferably 0.00 with respect to a total of 100 parts by weight of the propylene resin and precipitated barium sulfate. 2 to 20 parts by weight, more preferably 0.5 to 10 parts by weight. Specifically, when the present composition is a molding composition, the content of the baked shell hydrate is preferably 0 with respect to 100 parts by weight of the total content of the propylene-based resin and precipitated barium sulfate. 2 to 10 parts by weight, more preferably 0 from the viewpoint that the resin characteristics can be sufficiently exhibited, and a film or a molded body having excellent balance of antibacterial properties and mechanical strength can be easily obtained. When the composition is a master batch, the content of the shell baked hydrate is 100 parts by weight in total of the content of the propylene-based resin and the precipitated barium sulfate. Preferably it is 1-20 weight part, More preferably, it is 1-10 weight part.
In addition, when the film or molded product obtained from the composition is used for products with many opportunities to come into contact with water, such as sanitary products, tableware, and cooking utensils, the antibacterial effect can be exhibited over a long period of time. From the above, the content of the shell baked hydrate in the film or molded body is preferably 0.5 to 20 parts by weight, more preferably 100 parts by weight relative to the total content of propylene resin and precipitated barium sulfate. Is 1 to 10 parts by weight.

If the content of the shell baked hydrate is in the above range, a composition excellent in processability and moldability can be obtained, and the characteristics of the resin can be fully exerted, and the feeling of touch / feel, antibacterial properties, mechanical strength, etc. It is possible to easily obtain a film or a molded body that is excellent in balance.
When the content of shell baked hydrate is small, sufficient antibacterial effect tends not to be obtained, and when the content is large, physical properties of the obtained film or molded product tend to be lowered, and components derived from shell Coloring due to is likely to occur.

The lower limit of the ratio of the total weight of propylene-based resin and precipitated barium sulfate to the weight of the shell-fired hydrate (total weight of propylene-based resin and precipitated barium sulfate / weight of shell-baked hydrate) is preferably 5, more preferably 10, more preferably 20, particularly preferably 50, and the upper limit of the ratio is preferably 500, more preferably 200, still more preferably 150, particularly preferably 100.
When this ratio is within the above range, a composition excellent in processability and moldability can be obtained, and the characteristics of the resin can be fully exhibited, rather improved, antibacterial properties, hand / feel, surface smoothness, surface gloss, etc. In addition, it is possible to easily obtain a film or a molded body having a good balance.

<Calcined hydrate of dolomite>
The composition preferably contains a hydrated dolomite hydrate from the standpoint of easily obtaining a film or molded article having excellent antibacterial properties and excellent flame retardancy.
Dolomite calcined hydrates may be used alone or in combination of two or more different particle sizes.

  The dolomite to be baked is not particularly limited and may be naturally produced or may be produced by chemical synthesis. However, natural products are preferable because they are inexpensive for industrial use.

  In addition, the dolomite has a CaO / MgO molar ratio of preferably 0.5 to 3, more preferably 1.5 to 2.5, from the standpoint that a film or a molded article having more excellent antibacterial properties can be obtained. It is preferable to be in the range.

The dolomite calcined hydrate is not particularly limited as long as it is obtained by calcining dolomite and then hydrating. Specifically, after pulverizing dolomite if necessary, it is preferably 700 ° C. or higher. It can be produced by calcination at 900 to 1300 ° C., preferably in the air or in the presence of carbon dioxide gas, followed by hydration.
The firing time is appropriately set depending on the firing temperature or the like, but is usually 1 to 24 hours, preferably 5 to 20 hours after reaching the predetermined firing temperature.

  The hydrated dolomite hydrate, except that the dolomite is completely oxidized or hydrated, as long as the effect of the present invention is not hindered, unreacted carbonate or the like may remain after firing, Further, unreacted oxides and the like may remain after hydration.

  As the hydrated hydrate of dolomite, one that has been surface-treated by a conventionally known method can be used from the viewpoint of improving the affinity with the resin and dispersibility.

The average particle size of the calcined dolomite hydrate provides a composition with excellent processability and moldability, excellent masterbatch formability, excellent antibacterial properties, touch and feel, and flame retardancy. It is preferably 0.1 to 50 μm, more preferably 0.5 to 10 μm, and still more preferably 0.8 to 5 μm from the viewpoint that a body can be easily obtained.
The calcined hydrate of dolomite having such an average particle size is obtained by pulverizing the hydrate after hydration with a hammer mill, a roller mill, a ball mill, a jet mill or the like, if necessary, and classifying as necessary. Can be obtained at

The hydrated dolomite hydrate may be blended into the molding composition, may be blended into the masterbatch, or may be blended into the diluted component.
When blending dolomite calcined hydrate, the content of calcined dolomite in the molding composition is preferably 100 parts by weight in total of the content of propylene-based resin and precipitated barium sulfate. Is 1 to 30 parts by weight, more preferably 3 to 20 parts by weight, and the content of the baked hydrate of dolomite in the masterbatch is 100 parts by weight in total of the content of propylene resin and precipitated barium sulfate. On the other hand, it is preferably 5 to 50 parts by weight, more preferably 10 to 40 parts by weight. When blending the hydrated dolomite hydrate with the diluting component, it is contained in the molding composition comprising the masterbatch and the diluting component. What is necessary is just to mix | blend the dolomite calcination hydrate with the quantity which becomes the same quantity as the case where the content of the dolomite calcination hydrate mix | blends the said dolomite calcination hydrate with a shaping | molding composition.
When the dolomite calcined hydrate content is within the above range, a composition excellent in processability and moldability is obtained, the resin characteristics are sufficiently exhibited, and the film has a good balance between antibacterial properties and flame retardancy. And molded bodies can be easily obtained.

<Other ingredients>
In the present composition, depending on the desired application, the propylene-based resin, which is blended in articles such as sanitary articles, door members, handrail members, tableware trays, etc., such as films and molded articles, You may mix | blend other components other than the precipitation barium sulfate, shell baked hydrate, and dolomite baked hydrate in the range which does not impair the effect of this invention.
In addition to the propylene-based resin, the diluted component may contain precipitated barium sulfate, shell baked hydrate, dolomite baked hydrate and / or other components as necessary.
Each of the other components may be used alone or in combination of two or more.

  As the other components, additives commonly used in molded products made of thermoplastic resins or thermosetting resins, for example, filling with plasticizers, stabilizers, antioxidants, lubricants, talc, mica, calcium carbonate, etc. Agent, fiber such as carbon fiber and glass fiber, heat stabilizer, light stabilizer, ultraviolet absorber, dispersant, colorant, antibacterial agent such as zinc oxide, fluorescent whitening agent, flameproofing agent, antistatic agent, viscosity A regulator is mentioned.

  Among the fillers, it is preferable to use talc because the antibacterial effect is enhanced and a film or a molded body having excellent discoloration resistance and rigidity can be easily obtained.

  The average particle size of the talc provides a composition with excellent processability and moldability, excellent masterbatch formability, enhanced antibacterial effect, discoloration resistance, heat resistance, rigidity, hand feeling / feel to the touch, and It is preferably 1 to 20 μm, more preferably 3 to 18 μm, from the viewpoint that a film or a molded body having excellent surface smoothness can be easily obtained.

The specific surface area measured by the talc BET method is 1 to 20 m ² / g, preferably 3 from the viewpoint that the antibacterial effect is enhanced and a film or a molded article having excellent discoloration resistance can be easily obtained. ˜15 m ² / g.

  When using talc having an average particle size or specific surface area within the above range, a film or a molding that has an antibacterial effect enhanced more than when the shell baked hydrate is simply blended, and that the antibacterial effect is exhibited over a long period of time. A body etc. can be obtained more easily. This is thought to be because talc can adjust the speed at which the shell baked hydrate moves to the surface of the resulting film or molded body more appropriately.

When blending talc, the content of talc in the molding composition is preferably 2 to 40 parts by weight, more preferably 100 parts by weight of the total content of propylene-based resin and precipitated barium sulfate. 3 to 30 parts by weight, and the talc content in the master batch is preferably 30 to 80 parts by weight, more preferably 50 to 100 parts by weight with respect to the total of 100 parts by weight of the propylene-based resin and precipitated barium sulfate. When 70 parts by weight and talc is blended with the diluting component, the amount of talc in the molding composition comprising the masterbatch and the diluting component is the same amount as when blending the talc with the molding composition. What is necessary is just to mix | blend talc with the quantity used as follows.
When the content of talc is within the above range, a composition excellent in processability and moldability can be obtained, the characteristics of the resin can be fully exerted, the antibacterial effect can be enhanced, and the discoloration resistance, heat resistance, rigidity, and hand feeling. -Films and molded articles having excellent touch and surface smoothness can be easily obtained.

<Propylene-based resin composition>
The present composition can be obtained by mixing each of the above components, and each of the above components can be obtained by a conventionally known apparatus, specifically, a single screw extruder, a twin screw extruder, a kneader, a mixer, a two roll mill. It is preferable to obtain it by sufficiently kneading so that it may become uniform using.
Further, the molding composition produces a masterbatch containing a resin, only one of precipitated barium sulfate and shell baked hydrate, and, if necessary, other components. It can also be produced using a resin and a dilute component containing one of precipitated barium sulfate and shell fired hydrate not included in the masterbatch.

  Specifically, the master batch can be obtained by mixing the above-described components with a stirrer, etc., melt-kneading with an extruder, etc., cooling, and cutting into pellets with a pelletizer or the like.

  “Having antibacterial properties” means that the present composition itself, or a film or molded product obtained using the composition, has an antibacterial activity value based on JIS Z 2801 of 2.0 or more.

  The MFR of this composition measured based on JIS K 7210 (230 ° C., load 2.16 kgf) becomes a composition having excellent moldability, and a molded article such as an injection molded article having excellent mechanical strength such as impact resistance. Is preferably 5 to 50 g / 10 min, more preferably 10 to 40 g / 10 min.

≪Antimicrobial product≫
This composition can be formed into a film or a molded body by a conventionally known method, specifically, injection molding, extrusion molding, blow molding, calendering or the like, to obtain a product (antibacterial product).
Since such an antibacterial product is obtained using the present composition, the antibacterial performance is sufficiently exhibited while having the physical properties of the propylene-based resin, and the performance is exhibited over a long period of time. Become.
The antibacterial product may be a product consisting essentially of the present composition, or a product obtained by combining a film or a molded product obtained from the present composition with another member. There may be.

Examples of the antibacterial products include various products, and products that can be used in various fields such as household products, food, agriculture, fisheries, medical, industrial, and architecture, and particularly humans. Products that are in direct contact with the hands and body are preferred.
Examples of the antibacterial products include toilet switches such as toilets, toilet seats, tanks, washers (washing nozzles), washing switches, toilet paper holders, floors and walls; floors, walls, bathtubs, showers, faucets, Bathroom items such as soap boxes; Toiletries such as washstands and faucets; Door members such as door knobs, door handles, keys, and door plates; Handrail members provided in hospitals and stairs; Automobiles such as automobile interior parts Accessories, PC keyboards, mice, buttons for various electronic devices, various electronic devices such as mobile phones and telephones for home use, tableware such as serving trays, cooking utensils such as cutting boards and balls, robots, toys, models・ Plastic models, small doors such as shoehorns, furniture such as sofas and beds, and other products that come into direct contact with human hands and bodies.
In the present invention, products related to water, such as bathrooms, toilets, and washrooms, are collectively referred to as sanitary products.
Among these antibacterial products, tableware such as sanitary products, door members, handrail members, and trays are preferable.

  Next, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these Examples.

The following materials were used in the following tests.
“PP”: MFR (230 ° C., load 2.16 kgf) measured based on JIS K7210 is 20 g / 10 minutes, and Izod impact strength (23 ° C.) measured based on ASTM-D256 is 8.0 kJ / m. ² , a propylene resin (commercially available product) having a flexural modulus of 1200 MPa measured based on ASTM-D790
"Precipitated barium sulfate": precipitated barium sulfate (commercially available) having a D50 of 0.6 μm measured by laser diffraction method
“Talc”: talc (commercially available product) having a D50 of 15 μm measured by the laser diffraction method and a specific surface area of 4 m ² / g measured by the BET method
"Shell": "Scarlow" manufactured by Antibacterial Research Laboratories, a baked hydrated scallop shell (D50 measured by laser diffraction method: 2.6 μm)
"Antioxidant": "AO-60" manufactured by ADEKA Corporation, which is a phenolic antioxidant
・ "Lubricant": Calcium stearate (commercially available)

[Examples 1-2 and Comparative Examples 1-2]
Each component shown in Table 1 was used in the amounts shown in Table 1, and these were melt-kneaded at 200 ° C. using an extruder to obtain a resin composition. In addition, the unit of the numerical value in Table 1 is a weight part.

<Physical property evaluation>
Using each composition obtained in the examples and comparative examples, the MFR of the composition was measured under the conditions of a temperature of 230 ° C. and a load of 2.16 kgf based on the test method described in Table 2 below. The results are shown in Table 2.
In addition, each composition obtained in Examples and Comparative Examples was injection-molded at a molding temperature of 200 ° C. to prepare test pieces having a shape defined by each test method. The physical properties of the molded body were evaluated based on the described test method. The results are shown in Table 2. In addition, the antibacterial activity value measured the activity value with respect to colon_bacillus | E._coli.

  The glossiness was measured by injection-molding each composition obtained in Examples and Comparative Examples at a molding temperature of 200 ° C. to prepare a test piece having a width of 50 mm, a length of 90 mm, and a thickness of 2.5 mm. Table 2 shows the average values of the glossiness measured at 5 points using a Tokyo Denshoku gloss meter (TC-108DP) based on 8741.

As an evaluation of the feel of the test piece obtained in the same manner as the measurement of glossiness, whether or not 10 employees unrelated to this study touched the test piece with their hands and felt a moist feel. Were evaluated and evaluated based on the following evaluation criteria. The results are shown in Table 2.
◎: 10 out of 10 people felt moist ○: 10 out of 10 people felt moist △: 3 out of 10 people felt moist × : 0-10 out of 10 people felt moist

In addition, when the following resin compositions were used, it confirmed that it showed the physical property almost the same as Example 1. FIG.
50 parts by weight of PP, 50 parts by weight of precipitated barium sulfate, 2 parts by weight of shell, 0.4 parts by weight of antioxidant and 0.4 parts by weight of lubricant are mixed with a stirrer, and melt kneaded at 200 ° C. using an extruder. Then, it was cooled, and a master batch was obtained by cutting into 3 mm pellets with a pelletizer.
A resin composition was obtained by melt-kneading 50 parts by weight of the obtained master batch and 50 parts by weight of the PP using an extruder.

  The content of the baked shell hydrate is 1 part by weight with respect to a total of 100 parts by weight of the propylene resin and the precipitated barium sulfate, and 10 parts by weight with respect to the total of 100 parts by weight. Even if the shell baked hydrate is used in excess of 10 parts, the antibacterial effect is hardly improved, and when the shell baked hydrate is used in excess of 10 parts by weight, the physical properties of the obtained molded product are lowered. Tended to be.

According to the present composition, it is possible to obtain a molded article having high mechanical properties while taking advantage of the physical properties of the propylene-based resin, and in particular, a predetermined sedimentation property as compared with the case where only shell baked hydrate is used. According to the present composition using barium sulfate, the antibacterial effect of the shell baked hydrate can be further enhanced, and a molded article having excellent gloss and feel can be obtained.
Further, in Example 2, although the elongation characteristics were lowered, a molded article having excellent rigidity, antibacterial properties, discoloration based on the shell baked hydrate was remarkably suppressed, and excellent in touch and touch feeling was obtained. .

Claims (9)

  A propylene resin composition having antibacterial properties, comprising a propylene resin, precipitated barium sulfate having an average particle diameter of 0.1 to 10 μm, and shell baked hydrate having an average particle diameter of 0.1 to 30 μm object.   The composition according to claim 1, wherein the content of precipitated barium sulfate is 1 to 85% by weight.   The composition according to claim 1 or 2, wherein a ratio of a total weight of the propylene-based resin and precipitated barium sulfate to the shell baked hydrate is in the range of 5 to 500.   Furthermore, the composition of any one of Claims 1-3 containing the calcination hydrate of dolomite.   The sanitary goods obtained using the composition of any one of Claims 1-4.   The door member obtained using the composition of any one of Claims 1-4.   The handrail member obtained using the composition of any one of Claims 1-4.   Tableware obtained using the composition according to any one of claims 1 to 4.   A serving tray obtained using the composition according to any one of claims 1 to 4.