JP6162878B1 - Propylene resin composition, sanitary article, door member, handrail member, tableware and serving tray - Google Patents

Abstract

Disclosed is a composition that has an excellent antibacterial effect, can suppress discoloration based on a baked shell hydrate, and can easily form a film or a molded article that is excellent in touch and touch.
SOLUTION: A propylene resin, a talc having a specific surface area of 1 to 20 m ² / g and an average particle diameter of 1 to 20 μm, and a shell calcination hydration having an average particle diameter of 0.1 to 30 μm. A propylene-based resin composition having antibacterial properties.
[Selection figure] 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 inventor, it has been found that the antibacterial product described in Patent Documents 1 and 2 does not have sufficient antibacterial effect, and further, discoloration of the product due to shell baked hydrate occurs. In addition, such a product containing an antibacterial agent cannot be said to have a good touch and feel.

  The present invention has been made in view of the above-described problems, and has excellent antibacterial effect, can suppress discoloration based on shell baked hydrate, and can easily form a film or a molded body having excellent feel and feel. It is an object to provide a composition that can be produced.

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-based resin, talc having a specific surface area of 1 to 20 m ² / g and an average particle diameter of 1 to 20 μm, and shell baked hydrate having an average particle diameter of 0.1 to 30 μm And a propylene-based resin composition having antibacterial properties.
[2] The composition according to [1], further comprising 1 to 50 parts by weight of precipitated barium sulfate with respect to 100 parts by weight of the total of the propylene-based resin and talc.
[3] The composition according to [1] or [2], wherein the content of the talc is 5 to 85% by weight.
[4] The ratio according to any one of [1] to [3], wherein the ratio of the total weight of the propylene-based resin, talc and precipitated barium sulfate to the weight of the shell baked hydrate is in the range of 5 to 200. Composition.
[5] The composition according to any one of [1] to [4], further comprising a calcined hydrate of dolomite.
[6] A sanitary article, door member, handrail member, tableware or serving tray obtained using the composition according to any one of [1] to [5].

  ADVANTAGE OF THE INVENTION According to this invention, the discoloration | color_discoloration based on the shell baked hydrate which is excellent in an antibacterial effect can be suppressed, and the film, a molded object, etc. which are excellent in a touch feeling and the touch feeling can be formed easily at low cost. In particular, according to the present invention, while maintaining or improving the physical properties of the resin, a film or a molded article having antibacterial properties more than when simply adding a shell baked hydrate, specifically, a sanitary product, Articles such as tableware such as door members, handrail members and 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-based resin, a specific surface area of 1 to 20 m ² / g, and an average particle diameter of 1 to 20 μm. Includes talc and shell baked hydrate having an average particle size of 0.1 to 30 μm.
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 talc having a specific surface area and an average particle diameter in a specific range. The properties of propylene resin as a resin component and the speed at which it moves to the surface of films, molded products, etc., are moderately adjusted, thereby enhancing antibacterial properties compared to when resin and shell baked hydrate are simply blended. It is considered that the antibacterial effect is exhibited over a long period of time, and the discoloration based on the shell baked hydrate can be suppressed.

This composition uses a specific talc together with propylene-based resin and shell baked hydrate, so that it can not be achieved with conventional resin products, and it has a moist touch and feel that can be clearly seen at the moment of touch. A film or a molded product having a feeling can be obtained. For this reason, such a composition is particularly suitable as a material for articles that come into contact with human hands and skin, specifically sanitary articles, door members, handrail members, and dishes such as serving trays. Can be used for
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 60 to 80% by weight.
Thus, a masterbatch containing a solid component in a high concentration in a propylene-based resin is highly dispersed in a propylene resin in a state where the solid components (such as talc and shell baked hydrate) blended in this composition are stable. Therefore, handling becomes easy, and a film or a molded body in which talc, shell baked hydrate and the like are uniformly dispersed can be easily obtained at 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. Homopolymers are preferred, block copolymers are preferred from the standpoint of impact resistance and the like of films and molded products obtained from the composition, and block copolymers are more preferred in the composition where talc is an essential component. preferable.

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 >.
As a result of intensive studies by the inventor, it was found that the impact resistance of the obtained film or molded product tends to be reduced in the present composition containing talc. Accordingly, in the present composition in which talc is an essential component, it is preferable to use a propylene-based resin having an Izod impact strength in the above range.

  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 90% by weight, more preferably 15 to 85% by weight with respect to 100% by weight of the composition. It is. Specifically, when the composition is a molding composition, the content of the propylene-based resin is preferably 45 to 90% by weight, more preferably 50 to 85% by weight with respect to 100% by weight of the composition. When the composition is a master batch, the content of the propylene-based resin is preferably 10 to 55% by weight, more preferably 15 to 50% by weight with respect to 100% by weight of the composition. is there.
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.

<Talc>
The present composition includes talc having a specific surface area and an average particle diameter in a specific range.
By including such talc, it is possible to increase the crystallinity of the propylene-based resin, and to easily obtain a film or a molded body having excellent heat resistance, dimensional stability and rigidity, and excellent touch feeling and touch feeling. Can do. In particular, since the present composition contains talc having a specific surface area and an average particle size in a specific range, the composition has an antibacterial effect enhanced more than that obtained by simply blending the shell baked hydrate, and the antibacterial effect is further improved. Films and molded articles that can be exhibited over a long period of time can be easily obtained.
Furthermore, by blending the talc, a composition having excellent stability during molding and storage can be obtained, and discoloration based on shell baked hydrate can also be suppressed.
As the talc, two or more kinds of talc having different shapes such as specific surface area and average particle diameter may be used.

  The talc may be any shape such as granular, plate-like, rod-like, fiber-like, whisker-like, but is preferably plate-like or granular.

The talc may be produced by a conventionally known method or may be a commercially available product.
As the talc having the following average particle diameter, specific surface area and aspect ratio, commercially available products having these shapes may be used, and they can be obtained by a conventionally known method such as pulverization, granulation or classification.
Further, as the talc, those obtained by pulverizing raw stones may be used directly, or those obtained by surface-treating at least a part with a conventionally known surface treatment agent may be used.

  The degree of whiteness measured by the Hunter method of talc (JIS L 1015) can suppress discoloration based on the shell baked hydrate, and can easily obtain a film or a molded body of a desired color. Preferably it is 85% or more, more preferably 90% or more.

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 1-20 micrometers from the point that a film, a molded object, etc. which are excellent in surface smoothness can be obtained easily, Preferably it is 3-18 micrometers.
In addition, the average particle diameter in this invention means the volume average particle diameter (D50) measured by the laser diffraction method.

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.

The aspect ratio of the talc is excellent in discoloration resistance, heat resistance, dimensional stability, impact resistance and rigidity, excellent in masterbatch formation, and more enhanced than when the shell baked hydrate is simply blended. Preferably, the antibacterial effect is long-lasting, and the antibacterial effect is demonstrated over a long period of time, and a film or a molded article having excellent hand feeling and touch feeling can be easily obtained. The upper limit is not particularly limited, but is 50.
The aspect ratio is a value representing the ratio of the long side to the short side of the talc, and is an average value when ten talcs having a large aspect ratio are selected with a microscope or the like.

  By using talc having an average particle size, specific surface area, or aspect ratio in the above range, it is considered that the speed at which the shell baked hydrate moves to the surface of the resulting film or molded product can be appropriately adjusted. Thus, it is considered that the antibacterial effect is enhanced more than when the shell baked hydrate is simply blended, and the antibacterial effect is exhibited over a long period of time.

The content of talc in the composition may be appropriately selected according to the desired application, but is preferably 5 to 85% by weight, more preferably 5 to 80% by weight with respect to 100% by weight of the composition. . Specifically, when the composition is a molding composition, the content of talc is preferably 5 to 50% by weight, more preferably 5 to 45% by weight with respect to 100% by weight of the composition. When the composition is a master batch, the content of talc is preferably 40 to 85% by weight, more preferably 45 to 80% by weight with respect to 100% by weight of the composition.
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.

<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. Among them, the shell composition is uniform, the supply amount is large, it is inexpensive and has excellent antibacterial properties 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 diameter of the shell baked hydrate gives a composition excellent in processability and moldability, excellent in masterbatch formability, and a film or molded article exhibiting high antibacterial properties even in a small amount, From the point that it is difficult to reduce mechanical strength of a film or a molded body obtained from a composition containing a propylene-based resin and talc, 0.1 to 30 μm, preferably 0.1 to 10 μm, more preferably 0.5. ~ 5 μm.
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 0.2 to 30 with respect to 100 parts by weight of the total content of the propylene resin and talc. Part by weight, more preferably 0.5 to 20 parts by weight. Specifically, when the present composition is a molding composition, the content of the shell baked hydrate is preferably 0.2 to 100 parts by weight based on the total content of the propylene resin and talc. More preferably, it is 10 parts by weight, more preferably from 0.5 to 0.5, from the viewpoint that the resin characteristics are 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 masterbatch, the content of the shell baked hydrate is preferably 0.5 to 100 parts by weight with respect to the total content of the propylene resin and talc. 30 parts by weight, more preferably 1 to 20 parts by weight.
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. Thus, the content of the shell baked hydrate in the film or molded body is preferably 0.5 to 30 parts by weight, more preferably 1 to 100 parts by weight with respect to the total content of propylene resin and talc. 20 parts by weight.

When the content of shell baked hydrate is in the above range, a composition excellent in processability and moldability can be obtained, the characteristics of the resin are sufficiently exhibited, and a film excellent in balance between antibacterial properties and mechanical strength, A molded body or the like can be easily obtained.
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 ratio of the total weight of propylene resin, talc and precipitated barium sulfate to the weight of the shell fired hydrate (total weight of propylene resin, talc and precipitated barium sulfate / weight of shell fired hydrate) is , Preferably 5 to 200, more preferably 20 to 150, particularly preferably 50 to 100.
The “total weight of the propylene-based resin, talc and precipitated barium sulfate” is “the total weight of the propylene-based resin and talc” when the composition does not contain precipitated barium sulfate.
When this ratio is in the above range, a composition excellent in processability and moldability can be obtained, the characteristics of the resin can be sufficiently exhibited, and a film or a molded body excellent in balance between antibacterial properties and mechanical strength can be easily obtained. Can be obtained.

<Precipitated barium sulfate>
The composition preferably contains precipitated barium sulfate from the standpoint that it is excellent in rigidity, heat resistance and surface smoothness, and can easily obtain a film or molded article having high surface gloss. In particular, since precipitated barium sulfate is resistant to acids and alkalis, it is possible to obtain a film or molded product that exhibits the above effects over a long period of time despite containing a strongly basic shell baked hydrate.
Precipitating barium sulfate may be used alone or in combination of two or more different particle sizes.

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 can be easily obtained, it is preferably 0.1 to 10 μm, and more preferably 0.5 to 3 μm.
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.

Precipitating barium sulfate may be blended in the molding composition, may be blended in a masterbatch, or may be blended in a dilute component.
In the case where precipitating barium sulfate is blended, the precipitating barium sulfate content in the molding composition is preferably 1 to 40 parts by weight with respect to a total of 100 parts by weight of the propylene resin and talc content. More preferably, it is 3 to 30 parts by weight, and the content of precipitated barium sulfate in the masterbatch is preferably 5 to 50 parts by weight, more preferably 100 parts by weight of the total content of propylene resin and talc. Is 10 to 40 parts by weight, and in the case where precipitating barium sulfate is added to the diluting component, the content of precipitating barium sulphate in the molding composition comprising the masterbatch and the diluting component is The precipitating barium sulfate may be blended in an amount that is similar to the amount of blended with the molding composition.
When the content of precipitated barium sulfate is in the above range, a composition having excellent processability and moldability can be obtained, the properties of the resin are sufficiently exhibited, rather improved, and in a balanced manner such as antibacterial properties and high surface gloss. Excellent films and molded articles can be easily obtained.

<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, and facilitates the formation of films and molded articles with superior antibacterial and flame retardancy. From the standpoint of being able to be obtained, it is preferably 0.1 to 50 μm, more preferably 0.5 to 10 μm, still more preferably 0.8 to 5 μm.
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 the dolomite calcined hydrate is blended, the content of the calcined dolomite hydrate in the molding composition is preferably 1 to 100 parts by weight with respect to the total content of propylene resin and talc. 30 parts by weight, more preferably 3 to 20 parts by weight. The content of the baked hydrate of dolomite in the master batch is preferably 5 to 100 parts by weight with respect to the total content of propylene resin and talc. 50 parts by weight, more preferably 10 to 40 parts by weight, and when baked hydrate of dolomite is added to the diluted component, baked hydrate of dolomite in the molding composition comprising the masterbatch and the diluted component The dolomite calcined hydrate may be blended in such an amount that the content is the same as that when the calcined dolomite hydrate is blended into the 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 baked hydrate of a talc, a shell baked hydrate, precipitation barium sulfate, and a dolomite in the range which does not impair the effect of this invention.
In addition to the propylene-based resin, talc, calcined shell hydrate, precipitated barium sulfate, calcined hydrate of dolomite, and / or other components may be added to the diluted component, if 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, plasticizers, stabilizers, antioxidants, lubricants, fillers such as mica and calcium carbonate, Fibers such as carbon fibers and glass fibers, heat stabilizers, light stabilizers, UV absorbers, dispersants, colorants, antibacterial agents such as zinc oxide, fluorescent whitening agents, flameproofing agents, antistatic agents, viscosity modifiers Is mentioned.

<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.
In addition, the molding composition produced a masterbatch containing a resin, only one of talc and shell baked hydrate, and if necessary, other components, and this masterbatch, propylene resin and talc. And a dilute component containing one of the shell baked hydrates that is 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, toilets such as floors and walls; floors, walls, bathtubs, showers, faucets, etc. Bathroom items; washroom items such as washstands, faucets, soap boxes; door members such as door knobs, door handles, key parts, door plate materials; handrail members provided in hospitals, stairs, etc .; 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 K 7210 is 20 g / 10 minutes, and Izod impact strength (23 ° C.) measured based on ASTM-D256 is 8.0 kJ /. m ² , a propylene-based resin having a flexural modulus of 1,200 MPa measured based on ASTM-D790 (commercially available product)
“Talc”: Talc (commercially available) having a D50 of 15 μm measured by a laser diffraction method, a specific surface area of 4 m ² / g measured by the BET method, and a whiteness measured according to JIS L 1015 of 94% Product)
"Precipitated barium sulfate": precipitated barium sulfate (commercially available) having a D50 of 0.6 μm measured by laser diffraction 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 1-4 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.

Each of the compositions obtained in the examples and comparative examples was injection molded at a molding temperature of 200 ° C. to prepare a test flat plate (dimensions: 90 × 50 mm, thickness: 2 mm).
As an evaluation of the feel of the test piece obtained, 10 employees who were not related to this study touched the test piece with their hands and totaled whether or not they felt a moist touch. Based on the evaluation. 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.
40 parts by weight of PP, 60 parts by weight of talc, 2 parts by weight of shell, 0.4 parts by weight of antioxidant and 0.4 parts by weight of lubricant were mixed with a stirrer, and melt-kneaded at 200 ° C. using an extruder, The master batch was obtained by cooling and 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.

  According to the present composition, it is possible to obtain a molded article having a high flexural modulus and strength while taking advantage of the physical properties of the propylene-based resin, and in particular, compared with a case where a shell baked hydrate is simply used. According to the present composition using talc, the antibacterial effect of the shell baked hydrate can be further enhanced, and a molded article having an excellent touch feeling can be obtained.

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-based resin and talc, and exhibits a sufficient antibacterial effect, and exceeds 10 parts by weight with respect to the total of 100 parts by weight. The antibacterial effect is hardly improved even when the shell baked hydrate is used, and when the shell baked hydrate is used in excess of 10 parts by weight, the physical properties of the obtained molded product tend to decrease. there were.
Moreover, in Example 4, although the elongation characteristics were lowered, a molded article having excellent rigidity and high glossiness was obtained.

<Discoloration suppression>
A composition comprising PP, an antioxidant and a lubricant (Comparative Example 3 [composition not containing calcined shell hydrate in Comparative Example 2]), a composition obtained in Comparative Example 2, and a comparative example 1 The composition or the composition obtained in Example 1 was injection molded at a molding temperature of 200 ° C. to prepare a test flat plate (dimensions: 90 × 50 mm, thickness: 2 mm). Using the obtained test piece, brightness (L ^* value) and chromaticity (a ^* , b ^* ) were measured using Gretag Macbeth spectrophotometer CE-7000A, and color difference ΔE was calculated. ΔE indicates the color difference when the molded body of Example 1 is based on the molded body of Comparative Example 1, and the molded body of Comparative Example 2 is based on the molded body of Comparative Example 3.

<Heat resistance>
The composition obtained in Comparative Example 2 or the composition obtained in Example 1 was injection molded at a molding temperature of 200 ° C. to produce a test flat plate (dimensions: 90 × 50 mm, thickness: 2 mm). . The obtained test piece was heated at 80 ° C. for 24 hours, and the brightness (L ^* value) and chromaticity (a ^* , b ^* ) before and after heating were measured using a Gretag Macbeth spectrophotometer CE-7000A. The color difference ΔE was calculated.

  When the shell baked hydrate was used, discoloration of the molded product occurred, but by using talc, the color change based on the shell baked hydrate could be remarkably suppressed.

Claims (9)

Including propylene-based resin, talc having a specific surface area of 1 to 20 m ² / g and an average particle diameter of 1 to 20 μm, and shell baked hydrate having an average particle diameter of 0.1 to 30 μm A propylene-based resin composition having antibacterial properties ,
The content of the talc is 5 to 45% by weight with respect to 100% by weight of the propylene resin composition,
The content of the shell baked hydrate is 0.2 to 10 parts by weight with respect to 100 parts by weight of the total content of the propylene resin and talc.
Propylene-based resin composition .   Furthermore, the composition of Claim 1 which contains 1-50 weight part of sedimentation barium sulfate with respect to a total of 100 weight part of the said propylene-type resin and a talc. The composition according to any one of claims 1 to 2 , wherein a ratio of a total weight of the propylene-based resin, talc and precipitated barium sulfate to a weight of the shell baked hydrate is in a range of 20 to 200. 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 by using the composition according to any one of claims 1 to 4 .