JP5266517B2 - Molded body containing ultrafine metal particles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin-molded article capable of more effectively exhibiting excellent adsorptivity and fine protein inactivation that the metal ultrafine particles have. <P>SOLUTION: This ultrafine metal particle-containing molded article is characterized by having at least a layer consisting of a thermoplastic resin containing the metal ultrafine particles having the bond between an organic acid component with the metal, and also exposing the metal ultrafine particles on the surface of the thermoplastic resin layer. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a molded article containing ultrafine metal particles. More specifically, the present invention can more effectively express the adsorptivity or microprotein inactivation possessed by ultrafine metal particles having a bond between an organic acid and a metal. Related to a molded article.

Ultra-fine metal particles, especially ultra-fine metal particles with a particle size of 100 nm or less, are very different in characteristics from general metal particles, and their surface activity and surface area are particularly large, so they are used in various fields such as catalysts and adsorbents. Has been proposed.
For example, as a deodorant using ultrafine metal particles, the following Patent Document 1 proposes a deodorant containing, as an active ingredient, an ultrafine metal particle colloid liquid obtained by reducing a metal ion-containing liquid.
Further, a molded product in which ultrafine metal particles are dispersed in a resin has been proposed (Patent Document 2), and it is described that the molded product can be molded without being decomposed by the ultrafine metal particles.

  The present inventors have reported that ultrafine metal particles having a bond between an organic acid component and a metal (hereinafter sometimes simply referred to as “ultrafine metal particles”) are malodorous components such as methyl mercaptan, or volatile organic compounds such as formaldehyde. (Volatile Organic Compounds, hereinafter referred to as “VOC”) can be adsorbed, and it can immunologically inactivate difficult to remove microproteins such as allergens, viruses and bacteria. 2006-237898) and fine protein-inactivated metal ultrafine particles (Japanese Patent Application No. 2006-332077).

JP 2006-109902 A JP 2006-348213 A

However, the molded body in which the metal ultrafine particles having a bond between the organic acid component and the metal as described above are dispersed in the resin because the metal ultrafine particles are dispersed in the resin. Therefore, the remarkable surface activity inherent to ultrafine metal particles cannot be used effectively, and the excellent adsorptive properties and inactivation of microproteins possessed by ultrafine metal particles cannot be effectively exhibited. There is.
In addition, if the excellent adsorptivity and microprotein inactivation possessed by the ultrafine metal particles can be intentionally expressed from a desired time, it is possible to impart immediate effects and sustainability to the above-described effects.

Accordingly, an object of the present invention is to provide a resin molded article containing ultrafine metal particles capable of more effectively expressing the excellent adsorptivity and microprotein inactivation possessed by ultrafine metal particles.
Another object of the present invention is to intentionally start the excellent adsorptivity and microprotein inactivation of the metal ultrafine particles at the time of use, and the above-mentioned effects of the metal ultrafine particles are immediately effective and sustained. It is an object of the present invention to provide a resin molded body containing possible metal ultrafine particles.

According to the present invention comprises a laminate having inner and outer layers composed of the intermediate layer and the gas barrier layer made of a thermoplastic resin containing metal ultrafine particles having a bond between organic acid component and the metal, at least, the middle layer in use An adsorptive molded body characterized in that the metal ultrafine particles are exposed on the surface is peeled off .
In the adsorptive molded article of the present invention, it is preferable that the intermediate layer has plasmon absorption at 300 to 700 nm.

According to the present invention, there is also provided a laminate composed of at least three layers having a layer made of a thermoplastic resin containing ultrafine metal particles having a bond between an organic acid component and a metal, the intermediate layer being There is provided a molded body characterized by exfoliating to expose the ultrafine metal particles on the surface.
Also in the molded body using the above-mentioned resin layer containing ultrafine metal particles as an intermediate layer, The ultrafine metal particles have adsorptive properties and microprotein inactivation;
2. The thermoplastic resin layer has plasmon absorption at 300 to 700 nm,
Is preferred.

In the molded body of the present invention, since the ultrafine metal particles are exposed on the surface, the excellent adsorptive properties (including deodorizing properties) and microprotein inactivation that the ultrafine metal particles have can be exhibited more efficiently. Can do. That is, the molded article of the present invention can effectively adsorb odor components and VOCs, and effectively inactivate plant protein allergen substances such as cedar pollen and enzymes, or minute proteins such as viruses. Can do.
Further, in the laminate having the metal ultrafine particle-containing layer of the present invention as an intermediate layer, the intermediate layer is peeled off during use, thereby exposing the metal ultrafine particles present in the intermediate layer to the surface of the molded body. Since it is possible for the first time to exhibit the excellent effects of ultra-fine metal particles, the effects of ultra-fine metal particles are not exhibited before the intermediate layer is peeled off. It is possible to improve the immediate effect and the sustainability of the effect of.

As described above, the metal ultrafine particles having a bond between the organic acid component and the metal have excellent adsorptivity and microprotein inactivation, but this effect is based on the surface activity of the metal ultrafine particles. When the surface of ultrafine particles is covered with resin, the surface activity cannot be effectively used.
The molded article of the present invention has a layer made of a thermoplastic resin containing ultrafine metal particles having a bond between an organic acid component and a metal, and the ultrafine metal particles are exposed on the surface of the thermoplastic resin layer. Thus, it is possible to effectively express the excellent adsorptivity or microprotein inactivation possessed by the ultrafine metal particles.

In another embodiment of the molded article containing ultrafine metal particles of the present invention, a laminate composed of at least three layers having an intermediate layer composed of a thermoplastic resin containing ultrafine metal particles having a bond between the organic acid component and the metal. Because it consists of a body, the resin layer containing ultrafine metal particles is completely covered with the inner and outer layers before use, so it hardly adsorbs odorous components, etc., and does not come into direct contact with microproteins such as allergens. Does not inactivate microproteins.
On the other hand, when the intermediate layer is delaminated or agglomerated at the time of use, the ultrafine metal particles are exposed on the delaminated surface of the delaminated or agglomerated intermediate layer, and the adsorptivity or microprotein inactivation is described above. It becomes possible to express effectively like the laminated body of a 1st aspect.
Therefore, in a molded body having an ultrafine metal particle-containing resin layer as an intermediate layer, the ultrafine metal particles are exposed to the surface for the first time by delamination or cohesive separation of the ultrafine metal particle-containing intermediate layer. In order to begin to inactivate minute proteins, the effect is exhibited before use, and the effect is not already reduced in actual use, and the immediate effect and sustainability of the effect can be improved. It becomes possible.

As a method for exposing the surface of the metal ultrafine particles in the molded article of the present invention, any method may be used as long as the metal ultrafine particles are exposed on the surface. The metal ultrafine particles can be easily exposed by roughening the surface.
As the surface roughening method, shot blasting, sand blasting, and the surface of the ultrafine metal particle-containing layer can be scraped with sandpaper or a wire brush, or polished with an abrasive, etc. Is preferably roughened by shot blasting.
Roughening cannot be generally specified depending on the form, use, etc. of the molded body, but when the surface roughness Ra is 0.01 to 0.3, an immediate effect of the effect of the ultrafine metal particles is obtained. Desirable above.
In addition, as another method for exposing the ultrafine metal particles, the molded body having the ultrafine metal particle-containing resin layer of the present invention as an intermediate layer is subjected to delamination or cohesive delamination with the ultrafine metal particle-containing intermediate layer. The ultrafine metal particles can be exposed as a layered compact.

(Ultrafine metal particles)
Examples of the metal component of the ultrafine metal particles contained in the molded article of the present invention include Cu, Ag, Au, In, Pd, Pt, Fe, Ni, Co, Nb, Ru, Rh, Sn, and the like. Au, Ag, and Cu are preferable. These metal components may be a simple substance, a mixture, an alloy or the like.
As described above, in the present invention, it is an important feature that such a metal has a bond with an organic acid, and has an infrared absorption peak derived from the bond between the organic acid and the metal in the vicinity of 1518 cm ^−1. doing.

Examples of organic acids include myristic acid, stearic acid, oleic acid, palmitic acid, n-decanoic acid, paratoic acid, succinic acid, malonic acid, tartaric acid, malic acid, glutaric acid, adipic acid, acetic acid and other aliphatic carboxylic acids, Examples thereof include aromatic carboxylic acids such as phthalic acid, maleic acid, isophthalic acid, terephthalic acid, benzoic acid and naphthenic acid, and alicyclic carboxylic acids such as cyclohexanedicarboxylic acid.
In the present invention, the organic acid used is preferably a higher fatty acid such as myristic acid, stearic acid or palmitic acid, and particularly preferably has a high carbon number.
Examples of organic acid metal salts that are suitable starting materials for ultrafine metal particles include silver myristate and silver stearate, and the average particle diameter is in the range of 1 to 500 μm, particularly 10 to 200 μm. Is preferred.

The ultrafine metal particles having a bond between the organic acid and the metal of the present invention can be produced as a single ultrafine metal particle by heat-treating an organic acid metal salt that is a starting material of the ultrafine metal metal in an inert gas atmosphere. Preferably, the organic acid metal salt is mixed with the thermoplastic resin and subjected to a heat treatment at a temperature equal to or higher than the temperature at which the organic acid metal salt is thermally decomposed in the resin and lower than the deterioration temperature of the thermoplastic resin. Ultrafine metal particles can be formed and uniformly dispersed in the resin.
The heating conditions necessary for obtaining the ultrafine metal particles used in the present invention are different depending on the organic acid metal salt used, and thus cannot be defined unconditionally, but generally 120 to 350 ° C, particularly 170 to 300 ° C. It is desirable to heat at a temperature of 30 to 1800 seconds, particularly 120 to 600 seconds.
The ultrafine metal particles contained in the molded article of the present invention preferably have a maximum diameter of 1 μm or less and an average particle diameter in the range of 1 to 100 nm.

(Single-layered molded article containing ultrafine metal particles)
Among the above-mentioned laminates containing ultrafine metal particles, those having a single layer structure are formed by molding a resin composition containing ultrafine metal particles into a film, sheet, fiber, or a shape according to the application, and the surface is rough. It can shape | mold by forming.
A resin composition containing ultrafine metal particles is a resin composition capable of molding a resin molded article containing ultrafine metal particles, and heat treatment of an organic acid metal salt under an inert atmosphere as described above. The obtained ultrafine metal particles may be blended in a resin, but a resin composition containing an organic acid metal salt which is a starting material of the ultrafine metal particles described above is particularly preferable.
That is, as described above, the organic acid metal salt that is the starting material of the metal ultrafine particles having a bond between the organic acid and the metal is converted into the metal ultrafine particles in the resin molded article by heat treatment during the molding process of the resin composition. By forming and uniformly dispersing, it becomes possible to make the metal ultrafine particles exist in the resin molded product.
The fact that the ultrafine metal particles having a bond between the organic acid and the metal are uniformly dispersed in the resin can be confirmed by the presence of plasmon absorption of the nanoparticles.

As the resin containing ultrafine metal particles, any conventionally known resin can be used as long as it is a thermoplastic resin that can be melt-molded. For example, low-, medium-, high-density polyethylene, linear low-density polyethylene, linear Ultra-low density polyethylene, isotactic polypropylene, syndiotactic polypropylene, propylene-ethylene copolymer, polybutene-1, ethylene-butene-1 copolymer, propylene-butene-1 copolymer, ethylene-propylene-butene -1 copolymers such as olefin resins, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and other polyester resins, nylon 6, nylon 6,6, nylon 6,10 and other polyamide resins, polycarbonate resins and the like. .
Preferably, polyethylene, polypropylene, and polyester are preferably used, but the oxygen permeability coefficient is 1.0 × 10 ⁻⁴ cc · m / m ² · day ·, particularly for the purpose of adsorption. The resin is preferably atm or higher. As a result, the penetration of the odor component or VOC into the resin is increased, the adsorption of the odor component or VOC to the adsorbent metal ultrafine particles in the resin can be facilitated, and the adsorptivity can be further improved. In particular, polyethylene can be preferably used.
Further, in the metal ultrafine particle-containing molded product of the present invention, various compounding agents known per se, for example, fillers, plasticizers, leveling agents, thickeners, thickeners, stabilizers, oxidizing agents, depending on the use. An inhibitor, an ultraviolet absorber and the like can be blended according to a known formulation.

  In the resin molded product of the present invention, it is preferable to blend the organic acid metal salt in an amount of 0.001 to 5 parts by weight per 100 parts by weight of the resin. If the amount is less than the above range, sufficient effects cannot be obtained. On the other hand, if the amount is larger than the above range, the ultrafine metal particles may be aggregated and uniform dispersion may be difficult, which is not preferable.

(Multi-layered molded product containing ultrafine metal particles)
The ultrafine metal particle-containing molded article of the present invention may have a multilayer structure in which other layers are laminated on the surface of the above-described ultrafine metal particle-containing resin layer that has not been subjected to the roughening treatment.
As long as the other layers in the multilayer ultrafine metal particle-containing molded body can be laminated with a resin selected from the above-mentioned thermoplastic resins according to the application, or a metal ultrafine particle-containing resin layer, a metal substrate such as a metal foil It may be paper or the like.
The multilayered metal ultrafine particle-containing molded body can be molded by a conventionally known method. For example, a cast film formed in advance may be laminated using an adhesive or by thermal bonding, A laminate may be formed by co-injection or the like. The resin layer containing the ultrafine metal particles of the laminate thus molded can be molded by performing a surface roughening treatment.
In addition, a cast film formed in advance may be laminated with an adhesive or by thermal bonding on a single-layered ultrafine metal particle-containing molded body in which the ultrafine metal particles are exposed on the surface of the thermoplastic resin layer. Alternatively, after forming a three-layer laminate by co-extrusion, co-injection or the like, the metal ultrafine particles can be exposed on the surface of the thermoplastic resin layer by delamination from the metal ultrafine particle-containing resin layer.
Furthermore, after forming a molded body of at least three layers having a resin layer containing metal ultrafine particles, which will be described later, as an intermediate layer, the metal ultrafine particles are formed into the thermoplastic resin layer by cohesive failure of the metal ultrafine particle-containing resin layer. Can be exposed to the surface.

Further, in the metal ultrafine particle-containing molded body of the multilayer structure of the present invention, a coating agent containing an organic acid metal salt is applied to the surface of a molded body that has been previously molded, and a coating film containing metal ultrafine particles is formed by baking, The surface of the coating film containing ultrafine metal particles can be subjected to a roughening treatment.
Such organic acid metal salt-containing coating agent is bonded between organic acid and metal in the coating film by forming ultrafine metal particles in the paint component and uniformly dispersing by heat treatment during coating film baking. It is possible that ultrafine metal particles having
The organic acid metal salt is preferably blended in an amount of 0.01 to 5 parts by weight with respect to 100 parts by weight of the coating component, and if it is less than the above range, a sufficient effect cannot be obtained. If the amount is too large, the ultrafine metal particles may be aggregated, which is not preferable.

As the coating component for blending the organic acid metal salt, various materials can be used as long as the coating film can be formed by heating. For example, although not limited thereto, conventionally known coating compositions such as acrylic coating, epoxy coating, phenol coating, urethane coating, polyester coating, alkyd resin coating, and the like can be used.
The heat treatment conditions of the coating material cannot be generally defined by the type of paint component and organic acid metal salt used, but the temperature at which the paint component used does not cause thermal degradation and the organic acid metal salt can be nanoparticulated and nanodispersed. It is necessary to perform heat treatment for 60 to 600 seconds within the above temperature range.

(Molded body with resin layer containing ultrafine metal particles as intermediate layer)
In a molded body of at least three layers having a resin layer containing ultrafine metal particles as an intermediate layer, the resin constituting the intermediate layer can be selected from the thermoplastic resins described above, but the intermediate layer can be easily delaminated or agglomerated. It must be able to break and peel off at the intermediate layer.
In order to facilitate cohesive failure, in order to reduce the cohesive strength of the above-described thermoplastic resin, it is preferable to blend a resin that is incompatible with the resin constituting the inorganic particles or the intermediate layer.
Inorganic particles include, but are not limited to, carbon black, white carbon, talc, clay, mica, calcium silicate, zeolite, diatomaceous earth, silica sand, synthetic silica, alumina hydrate, calcium carbonate, calcium sulfate, aluminum oxide , Titanium oxide, metal powder, glass powder and the like alone or in combination of two or more.
From the viewpoint of reducing cohesive strength. The average particle size of these inorganic particles is desirably in the range of 0.1 to 100 μm.

In addition, as the resin incompatible with the resin constituting the intermediate layer, for example, when a polyethylene resin is used for the intermediate layer, preferable incompatible resins include, for example, polypropylene resin, ethylene-propylene copolymer, ethylene- Examples thereof include vinyl alcohol copolymers, polyvinyl alcohol resins, polyvinyl formal resins, polyvinyl butyral resins, and polymethyl methacrylate resins.
These inorganic particles and incompatible resin are preferably set to a value in the range of 1 to 100 parts by weight per 100 parts by weight of the resin constituting the intermediate layer. If the blending amount is less than the above range, the cohesive force lowering effect may not be sufficiently exhibited. On the other hand, if the blending amount is more than the above range, the intermediate layer becomes inferior in adhesion to the inner and outer layers, The adhesive force between the inner and outer layers and the intermediate layer is lower than the cohesive failure force, and it becomes difficult to easily cohesively break the metal ultrafine particle-containing intermediate layer.

In addition, by strengthening the adhesive strength at the interface between the adjacent layer of the ultrafine metal particle layer and the adjacent layer, the ultrafine metal particle-containing intermediate layer can be easily agglomerated and destroyed. You may laminate | stack using the acid modified olefin resin, urethane type resin, etc. which were used as adhesive resin.
In addition, the resin constituting the innermost layer and the outermost layer has a gas barrier property in order to prevent permeation of the adsorbed component to the intermediate layer, particularly when the purpose is to adsorb the ultrafine metal particles. Desirably, an ethylene vinyl alcohol copolymer, polyamide, gas barrier polyester, metal foil, and the like can be suitably used.

Although it is not limited to this as a layer structure, gas barrier layer / easy cohesive breakable resin layer containing ultrafine metal particles / gas barrier layer, gas barrier layer / adhesive resin layer / intermediate layer containing ultrafine metal particles / adhesive resin layer / gas barrier layer, etc. Can be mentioned.
In order to facilitate peeling due to cohesive failure in the ultrafine metal particle-containing intermediate layer, it is preferable to provide a peeling start position where no intermediate layer is present and the inner and outer layers are not bonded at the end of the molded body.
The thickness of the intermediate layer in the molded body having metal ultrafine particles as an intermediate layer is not limited to this, but it is desirable to have a thickness of 5 μm or more, particularly 5 to 1000 μm.
Also in this embodiment, the organic acid metal salt is preferably blended in an amount of 0.001 to 5 parts by weight per 100 parts by weight of the resin constituting the intermediate layer, and the thickness of the intermediate layer is not limited thereto. However, it is desirable to have a thickness of 5 μm or more, particularly 5 to 1000 μm.
In this aspect, the molded body can adopt various shapes as long as it has a shape that can cohesively break the intermediate layer in addition to a sheet, a film, and the like.

(Deodorization evaluation)
1. Measurement of undeodorized methyl mercaptan concentration In a 500 mL glass bottle substituted with nitrogen gas whose mouth was sealed with a rubber stopper, 5 μL of the malodorous methyl mercaptan adjusted to a concentration of 10 ppm in the bottle was microsyringe. And left at room temperature (25 ° C.) for 1 day. After leaving for one day, a gas-tech detector tube was inserted into the bottle, and the residual methyl mercaptan concentration was measured to obtain the undeodorized methyl mercaptan concentration (A).

2. Measurement of methyl mercaptan concentration after deodorization The molded bodies obtained from Examples and Comparative Examples were cut into 50 mm squares, placed in a 500 mL glass bottle substituted with nitrogen gas, and sealed with a rubber stopper. 5 μL of malodorous methylmercaptan adjusted to 10 ppm was injected with a microsyringe, and each was allowed to stand at room temperature (25 ° C.) for 5 minutes, 1 hour, 1 day. After leaving for 5 minutes, 1 hour, and 1 day, a Gastec detector tube was inserted into each bottle, the residual methyl mercaptan concentration was measured, and after deodorization, the methyl mercaptan concentration (B) was obtained.

3. Calculation of deodorization rate of methyl mercaptan Value obtained by subtracting methyl mercaptan concentration (B) after deodorization from methyl mercaptan concentration (A) at the time of non-deodorization divided by methyl mercaptan concentration (A) at the time of non-deodorization. The deodorization rate after 5 minutes, 1 hour and 1 day was calculated.

(Antimicrobial evaluation)
The molded products obtained in Examples and Comparative Examples were confirmed for antibacterial effect according to JIS Z 2801. Escherichia coli was used as the bacterial species. The logarithmic value of the number obtained by dividing the number of bacteria after culturing of the molded body from which the number of bacteria after cultivation of the antibacterial processed film was obtained was calculated as the antibacterial activity value. The antibacterial effect has not been confirmed for S. aureus, but it is presumed that the antibacterial effect is similar to that of Escherichia coli.

(Evaluation of mite allergen inactivation)
1. Confirmation method of mite allergen inactivation effect (tick scan)
The inactivation effect on Der f I (Asahi Food and Healthcare) (allergen contained in mite worms) was confirmed using tick scan (Asahi Food and Healthcare). Confirmation of the inactivation effect is performed by confirming the presence of mite antigens, contacting and immersing each molded article with the antigen, respectively, and according to the following criteria for determining mite allergens. confirmed.

2. Confirmation of the presence of mite allergen (1) Mite antigen solution: 20 μL of Der f I solution (2 μg of mite antigen amount) was added to a PP tube (manufactured by BIO-BIK) and incubated at 37 ° C. for 3 hours.
(2) Confirmation of presence of mite antigen: After incubation, the solution was dropped on the tick scan measurement part, and the presence of the mite antigen was confirmed by the coloring amount of the C line and T line described below.

3. Confirmation of mite allergen inactivation effect (1) Molded body sample: The molded body was sampled into a strip shape having a length of 100 mm according to Examples and Comparative Examples to obtain a molded body sample.
(2) Contact / immersion: 20 μL of Der f I solution (antigen amount 2 μg) was added to a PP tube (manufactured by BIO-BIK), the molded body sample was inserted, contacted and immersed, and incubated at 37 ° C. for 3 hours. .
(3) Determination: After the incubation, the molded body sample was removed, the solution was dropped onto the tick scan measurement part, and the inactivation effect was confirmed by the coloring amount of the C line and T line described below.

4). Criteria for tick scan 1: No mite allergen contamination (C line coloring, T line coloring not at all)
2: Slightly contaminated with mite allergen (C line coloring> T line coloring)
3: Contaminated with mite allergen (C line coloring = T line coloring)
4: Very dirty with mite allergen (C line coloring <T line coloring)

(Enzyme inactivation evaluation)
1. Method for confirming enzyme inactivation effect The enzyme inactivation effect was confirmed using β-galactosidase. The inactivation effect is confirmed by confirming the presence of the enzyme and setting it as an initial value. On the other hand, it is contacted and immersed in the molded bodies obtained from the examples and comparative examples to obtain a sample value. The effect was confirmed by calculating the activation rate. For the enzyme activity measurement, β-Galactosidase Enzyme Assay System with Reporter Lysis Buffer (manufactured by Promega) was used, and the attached product was used for β-galactosidase.

2. Confirmation of presence of initial enzyme (1) Preparation of enzyme solution: Dilute with 1 × Reporter LysisBuffer so that the concentration of β-galactosidase is 0.1 μL / 1 mL.
(2) Pretreatment: β-galactosidase solution (0.1 μL / 1 mL) 50 μL was added to a PP tube (manufactured by BIO-BIK) and incubated at 37 ° C. for 2 hours. Thereafter, 100 μL of 1 × ReporterLysisBuffer was mixed.
(3) Color development reaction: 150 μL of AssayBuffer was added dropwise, and after mixing, the mixture was reacted in a 37 ° C. hot water bath for 30 minutes.
(4) Stop reaction: 500 μL of 1M sodium carbonate was mixed to stop the reaction.
(5) Absorbance measurement: The absorbance at 420 nm of the solution was measured and used as the initial value.

3. Confirmation of enzyme inactive effect of sample (1) Preparation of enzyme solution: Dilute with 1 × Reporter LysisBuffer so that the concentration of β-galactosidase is 0.1 μL / 1 mL.
(2) Contact / immersion: 100 μL of β-galactosidase solution (0.1 μL / 1 mL) is added to the PP tube, and the molded body (width 3 mm, length 20 mm) is inserted into the PP tube and contacted / immersed in the solution. Incubated for 2 hours at ° C. After removing the molded body, 50 μL of the solution was collected and mixed with 100 μL of 1 × ReporterLysisBuffer.
(3) Color development reaction: 150 μL of AssayBuffer was added dropwise, and after mixing, the mixture was reacted in a 37 ° C. hot water bath for 30 minutes.
(4) Reaction stop: After 30 minutes, 500 μL of 1M sodium carbonate was mixed to stop the reaction.
(5) Absorbance measurement: The absorbance at 420 nm of the solution was measured and used as a sample value.

3. Calculation of enzyme inactivation rate Using the measured initial value and sample value, the enzyme inactivation rate of the sample was determined from the following formula.
(Enzyme inactivation rate) = (1−sample value / initial value) × 100 (%)

[Example 1]
Silver stearate was blended in the low density polyethylene resin so as to have a content of 0.5 wt%, and extruded at an extrusion temperature of 200 ° C. to produce a single layer film. Perform shot blasting using hydrocarbon powder so that the surface roughness Ra on one side of the obtained film is 0.15, deodorant evaluation, antibacterial evaluation, mite allergen inactivation evaluation, enzyme inactivation evaluation described above Went.

[Example 2]
Evaluation was performed in the same manner as in Example 1 except that ethylene-vinyl alcohol copolymer resin (EVOH) was used as the second layer and coextruded to form a two-layer film.

[Example 3]
The first layer (surface layer) is blended with high density polyethylene resin, the second layer (intermediate layer) is blended with low density polyethylene resin so that the content of silver stearate is 0.5 wt%, and the third layer (lower layer) ) Was co-extruded at an extrusion temperature of 200 ° C. so as to be a high-density polyethylene resin, to produce a three-layer film. The second layer (intermediate layer) of the obtained multilayer film was agglomerated and peeled to expose the ultrafine metal particles on the surface of the second layer (intermediate layer). Evaluation was performed in the same manner.

[Example 4]
The first layer (surface layer) is composed of polypropylene resin, the second layer (intermediate layer) is a blend resin blended with 50% by weight of low density polyethylene resin and polypropylene resin, and the third layer (lower layer) is composed of three layers of low density polyethylene resin. Evaluation was performed in the same manner as in Example 3 except that a film was produced.

[Comparative Example 1]
A two-layer film was prepared and evaluated in the same manner as in Example 2 except that shot blasting was not performed.

[Comparative Example 2]
A multilayer film was produced in the same manner as in Example 3, the interlayer between the first layer and the second layer (intermediate layer) was peeled off, and the metal ultrafine particles were exposed on the surface of the second layer (intermediate layer). Evaluation was carried out in the same manner as in Example 3 except that no change was made.

  From the examples and comparative examples, the ultrafine metal particles are exposed on the surface of the thermoplastic resin, such as adsorptive properties such as deodorization by the ultrafine metal particles, inactivation of antibacterial and mite allergens, inactivation of enzymes, etc. It can be seen that minute protein inactivation can be improved.

Claims (2)

Consist organic acid component and the intermediate layer made of a thermoplastic resin containing metal ultrafine particles having a bond between the metal and having at least laminate the inner and outer layers made of a gas barrier layer, by peeling the intermediate layer at the time of use, the metal An adsorptive molded article characterized by exposing ultrafine particles to the surface . Adsorptive molded article according to claim 1 Symbol mounting said intermediate layer has a plasmon absorption at 300 to 700 nm.