JPH06330099A - Article for bleaching treatment - Google Patents

Abstract

PURPOSE:To obtain an article for bleaching treatment free from blister of a container and change of liquid composition in long term storage under severe conditions and useful in bleaching of clothes and removal of fungi by packing a liquid bleaching agent composition having a specific composition into a container made of a thermoplastic resin having gas permeability. CONSTITUTION:The article is obtained by packing (B) a liquid bleaching agent composition containing (iv) 0.1-10wt.% of hydrogen peroxide water or organic peracid, (v) 0.5-20wt.% of a surfactant, (vi) 0.1-5wt.% of at least one kind of glycolic acid, lactic acid, etc., and (vii) 0-10wt.% of a bleaching activating agent into (A) a container made of a thermoplastic resin having (i) >=1ml/atm O2 gas permeability and (ii) >=2ml/atm CO2 gas permeability per l inner volume at 23 deg.C for 24hr and having (iii) <=0.1g water content (with the proviso that a container has 0.8-10mm average thickness of the bottom of the vessel and 1.0-1.2 flat ratio of drum inner wall part).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an article for bleaching used for bleaching clothes and removing stains and molds on dishes and toilets.

[0002]

2. Description of the Related Art An aqueous solution of hypochlorite and hydrogen peroxide has hitherto been used for bleaching clothes, removing stains on hard surfaces such as dishes and toilets, and removing mold. Has been widely used due to its liquidity and ease of use. Usually these liquid bleaches are 0.5-10
It is filled in a resin bottle made of a hard plastic such as polyethylene having high airtightness as an aqueous solution of wt% and is widely marketed as a household liquid bleaching agent. Alternatively, a liquid bleaching agent provided by being dispersed in an aqueous solution or a solvent of another inorganic peracid or organic peracid is also widely known.

The liquid bleaching agent may decompose depending on the storage conditions, and as a result, the generated gas may deform the bottle or the container may break to cause liquid leakage. Therefore, conventionally, studies have been conducted to improve the storage stability of liquid bleaching agents. For example, in the case of an aqueous solution of hypochlorite, the addition of a specific polyoxyethylene alkylphenol sulfate in JP-A-51-37903 and the addition of a specific fragrance component in JP-A-62-89800 improve stability. It is described as effective.

In recent years, a large number of liquid oxygen type bleaches containing hydrogen peroxide as a main component have been marketed. These oxygen-based bleaching agents can be used for colors and patterns and have a better odor than chlorine-based bleaching agents, so they are widely used as clothing bleaching agents.

Various studies have been made to improve the stability of bleaching agents using these aqueous hydrogen peroxide solutions.
Japanese Patent Publication No. 40-7774 discloses a storage-stable weakly acidic liquid bleaching agent containing a combination of acidic sodium pyrophosphate, neutral sodium pyrophosphate and acidic potassium pyrophosphate, and JP-A-49-52784 discloses alkylidene diphosphone. Acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid and nitrilotrimethylenephosphonic acid, and a stable liquid bleaching agent having a pH of 0.5 to 7 and a soluble tin salt and an ammonium salt are disclosed in JP-A-52-103386. In the publication, a hydrogen peroxide stabilizer composed of poly-α-hydroxyacrylic acid is disclosed in JP-A-54-
No. 10309 discloses that water is added to a magnesium compound and an acid to cause complexation in a neutralization reaction, and a liquid material having hydrophilicity suppresses decomposition of hydrogen peroxide at pH 4 to 6,
JP-A-55-108500 discloses a stable liquid bleaching agent having a pH of 1.8 to 5.5, which is prepared by mixing an acid selected from organic acids, phosphoric acid and boric acid, and a nitrogen compound, and disclosed in JP-A-55-76161. Discloses a synergistic stabilizing effect when a poly-α-hydroxyacrylate is blended in an alkaline hydrogen peroxide bleaching system using condensed phosphate as a stabilizer.
4457 discloses acrylic acid and acrylic ester and /
Alternatively, a stabilizing aid for a hydrogen peroxide-based bleaching agent comprising a copolymer of polyethylene glycol methacrylate is disclosed in JP-A-62-
In 185797, peroxidized water containing a combination of poly-α-hydroxy acrylate and an organic phosphonate is widely used as a bleaching agent for clothing. However, oxygen-based bleaching agents cannot be said to have sufficient bleaching power especially for hard kitchen stains, and the use of various chelating agents has been investigated, and as a result, various chelating agents have been used in combination. It has been confirmed that the effect is greatly improved.

However, when a chelating agent is used in combination, the compounding amount must be relatively large, and in order to bring out the effect of the chelating agent to a greater extent, the pH is set in a region where hydrogen peroxide becomes more unstable. It will need to be set.

Further, regarding organic chelating agents such as glycolic acid, lactic acid, and citric acid, it is observed that carbon dioxide is further generated during storage, which causes swelling / deformation of the bottle. Emission is also essential to use a chelating agent together. For example, JP-A-59-
The hydrogen peroxide-based bleaching agent combined with the chelating agent disclosed in Japanese Patent No. 164400 produces carbon dioxide due to decomposition during storage and is difficult to market as a product.

As described above, in order to improve the storage stability of the bleaching agent composition contained in a bottle container, even if a high stability can be realized only in terms of the composition of the composition, that alone is not sufficient as a commercial product. Sufficient performance is also required for the container filled with the agent composition, but so far no research has been done from the viewpoint of a bottle that allows gas to permeate without liquid leakage.

Therefore, an object of the present invention is to blister a container (hereinafter referred to as a blister of a container) due to the gas generated by the decomposition of the liquid bleach contained in the container even when the container is stored for a long time under severe conditions. It is an object of the present invention to provide a liquid bleaching agent in a container, which is free from the above, and which can prevent changes in the liquid composition inside the container.

[0010]

DISCLOSURE OF THE INVENTION The inventors of the present invention have found that bleaching in a container does not cause blistering due to gas generated by decomposition of the bleaching agent even during long-term storage at high temperature, and can prevent changes in internal liquid composition. As a result of intensive research to develop agents, it was found that the gas that causes blistering of the container is not only oxygen but also carbon dioxide, and as a result, it has specific gas permeability and moisture permeability, We have found that a thermoplastic resin container having a shape is suitable for the purpose, and completed the present invention.

That is, according to the present invention, a container made of a thermoplastic resin having a gas permeability within the range shown below (provided that the average thickness of the bottom of the container is 0.8 to 10 mm and the inner wall of the body of the container is A container having at least a portion having a flatness of 1.0 to 1.2) is filled with a liquid bleaching agent composition shown below to provide a bleaching article. Gas permeability of thermoplastic resin container The gas permeability per 1 liter of internal volume is 24 hours, 23 ° C, (a) Oxygen is 1 ml / atm or more (b) Carbon dioxide is 2 ml / atm or more ( c) Water content is 0.1g or less. The method for measuring gas permeability is shown in Examples. Liquid bleaching composition contains the following components (a) to (d). (A) component: hydrogen peroxide or organic peracid 0.1 to 10% by weight (B) component: surfactant 0.5 to 20% by weight (C) component: glycolic acid, lactic acid, glutaric acid and citric acid and their alkali metals At least one selected from the group consisting of salts 0.1 to 5% by weight (d) Component: bleach activator 0 to 10% by weight.

[Thermoplastic Resin Container] It is important for the thermoplastic resin container in the present invention to have the specific gas permeability as described above, and in order to satisfy this requirement, the thermoplastic resin container It is necessary to select the type and wall thickness of the container. If this requirement is not met, there is no blistering of the container and there is no change in the liquid composition inside the container.
The bleaching article desired by the present invention cannot be obtained.

The thermoplastic resin usable in the present invention includes polyolefins such as polyethylene (high-density polyethylene, low-density polyethylene, linear low-density polyethylene, etc.), polypropylene (homopolymer, block polymer, random polymer), polybutene, etc. , Polyvinyl chloride or polystyrene-based polymers (polystyrene, acrylonitrile-styrene resin, styrene-butadiene block copolymer), or mixtures thereof. Of these, polyolefin is particularly preferable.

When a polyolefin resin is used, polyethylene resin, polypropylene resin, polybutene resin or the like may be used alone or in an appropriate mixture, but the container of the present invention is blow molded. It is more effective to use the same type of resin for continuous mass production by thermoforming.

The average thickness of the body of the container of the present invention (see FIG. 1 means the part of the container excluding the part where the cap is fitted and the bottom) is the kind of resin used and its density. Therefore, it may be determined so as to satisfy the gas permeability which is a constituent factor of the present invention, but it is usually 0.4 to 1.5 mm, preferably 0.5 to 1.4 mm.

In the present invention, the thickness of the bottom of the container (see FIG. 1) is in the range of 0.8 to 10 mm, preferably 1.0 to 5.0 mm, regardless of the type of thermoplastic resin used. It is important to set to. If the thickness of the bottom of the container does not fall within this range, the desired object of the present invention cannot be achieved.

Furthermore, in the present invention, the flatness ^** (defined below) of the inner wall portion (see FIG. 1) of the body of the container is
It is important to have at least a portion that is 1.0 to 1.2, preferably 1.0 to 1.1. Even if this requirement is not satisfied, the purpose desired by the present invention cannot be achieved. ^** Definition of flatness Measure the major axis and minor axis of the bottle cross section in the body part other than the handle of the bottle (see Fig. 5), and calculate by flatness = (minor axis of bottle cross section) / (minor axis of bottle cross section) It is what is done.

FIG. 2 is a schematic sectional view showing a preferred example of the container used in the present invention.

Further, since many ordinary bleaching bases have a problem in light resistance, the bottle may be required to have light-shielding properties. In this case, various pigments are added to the bottle molding resin. Organic pigments include azo pigments, anthraquinone pigments, phthalocyanine pigments, perinone pigments,
A perylene pigment, a chryclidone pigment, a dioxadiene pigment, a thioindigo pigment, an isoindirinone pigment, or a mixture thereof can be used. Inorganic pigments such as red iron oxide, titanium white, titanium yellow, calcined pigment green, chromium oxide, cobalt blue, silica, metal oxides such as alumina, sulfides such as cadmium yellow and cadmium red, and silicic acid such as ultramarine Chromates such as salts, yellow lead and chrome vermilion, carbons such as carbon black, clays such as talc, kaolin and clay, inorganic salts such as calcium carbonate and magnesium carbonate, or a mixture thereof can be used. . In particular, a phthalocyanine pigment, an azo pigment, a metal oxide pigment or a mixture thereof is excellent in weather resistance, light-shielding property, heat resistance, color developing property, chemical resistance and the like, and is preferably used.

When the phthalocyanine pigment or azo pigment is used here, the kind and shape thereof are not particularly limited, and for example, highly purified pigments or those obtained by heat treatment to remove impurities are used. It is possible, or even if some impurities are mixed in.

When titanium white among the metal oxides is used together with the above organic pigment, titanium white is usually referred to as titanium dioxide (TiO ₂ ), but a small amount of titanium dioxide (TiO) or dititanium trioxide is added to this. (Ti ₂ O ₃ ) mixed with it can be used, or a small amount of silica,
Even if it contains impurities such as alumina and other heavy metals and metal oxides, it can be used without any problem. There is no particular limitation on the shape of the titanium oxide.

In the production of the container of the present invention, various kinds of antioxidants, ultraviolet absorbers, antistatic agents (amine compounds, higher alcohols, monoglycerides, etc.), lubricants and the like can be added to the thermoplastic resin.

Using the container of the present invention described above,
In most cases, blistering of the container can be prevented, but a thermoformed multilayer container having a layer (B) made of a thermoplastic resin containing no pigment inside the layer (A) made of a thermoplastic resin containing a pigment. In that case, the container will have less blisters, and the container will have a good stability in sitting.

The above-mentioned pigments can be used as the pigment added to the layer (A) in the case of a thermoformed multilayer structure container. Also layers
The layer thickness ratio of (A) and layer (B) is not particularly limited and may be appropriately selected and determined depending on the type and blending amount of the thermoplastic resin or pigment used. Generally, in the case of a two-layer container, when the total layer thickness is 100, the layer (B) preferably has a layer thickness ratio of 0.01 to 50
The ratio of (A) is 99.99 to 50, and particularly preferably the ratio of layer (A) is 99 to 55 with respect to layers (B) 1 to 45.

The container used in the present invention can be manufactured by various methods and is not particularly limited. In the case of a multilayer container, for example, the layer (A) and the layer as described above are used.
A desired multilayer container can be obtained by thermoforming a laminate sheet having (B) such as blow molding. Molding of the container used in the present invention may be carried out under the usual conditions.

[Liquid bleach composition] The liquid bleach composition to be filled in the container of the present invention is, as described above, the component (a):
(D) Contains the component.

Component (a): hydrogen peroxide or organic peracid
Used from 0.1 to 10% by weight. Here, the organic peracid is dodecane diperacid, monoperphthalic acid, diperphthalic acid, or an organic peracid represented by the following general formula.

[0028]

[Chemical 1]

And so on.

Component (b): 0.5 to 20% by weight, preferably 1 to 15% by weight of a surfactant is used in the liquid bleaching composition of the present invention. Examples of the surfactant used in the present invention include anionic surfactants, nonionic surfactants, amphoteric surfactants, and mixtures thereof. Examples of the anionic surfactant include the following. Here refers to those having a carbon chain of C ₈ -C ₂₄ and the alkyl or alkenyl. For example, straight chain or branched chain alkylbenzene sulfonate, alkyl or alkenyl ether sulfate, alkyl or alkenyl sulfate, olefin sulfonate, alkane sulfonate, saturated or unsaturated fatty acid salt, α-sulfo fatty acid ester, α- Examples of the nonionic surfactant include sulfo fatty acid salt, and polyoxyalkylene alkyl or alkenyl ether, polyoxyethylene alkylphenyl ether,
Examples include higher fatty acid alkanolamide or alkylene oxide adduct thereof, sucrose fatty acid ester, fatty acid glycerin monoester, alkylamine oxide, pluronic type surfactant, sorbitan fatty acid ester or ethylene oxide adduct thereof. Other examples of the surfactant include carbobetaine, sulfobetaine, amine oxide and the like.

Component (c): The chelating agent used in the present invention serves to stabilize the liquid bleach composition during storage and to improve the bleach cleaning effect. The chelating agent used here is at least one selected from the group consisting of glycolic acid, lactic acid, glutaric acid, citric acid and alkali metal salts thereof, and the amount used is 0.1-5% by weight, preferably 0.2-4.
Used by weight percent.

In the present invention, if desired, other chelating agents can be used in combination. Examples of these chelating agents (hereinafter referred to as combined chelating agents) include (1) phosphoric acid compounds such as orthophosphoric acid, pyrophosphoric acid, tripolyphosphoric acid, metaphosphoric acid, hexametaphosphoric acid and phytic acid, or alkali metal salts or alkanols thereof. Amine salt. (2) ethane-1,1-diphosphonic acid, ethane-1,1,2-triphosphonic acid, ethane-1-hydroxy-1,1-diphosphonic acid and its derivatives, ethanehydroxy-1,1,2-
Triphosphonic acid, ethane-1,2-dicarboxy-1,2-
A phosphonic acid such as diphosphonic acid or methanehydroxyphosphonic acid, or an alkali metal salt or alkanolamine salt thereof. (3) 2-phosphonobutane-1,2-dicarboxylic acid, 1-phosphonobutane-2,3,4-tricarboxylic acid, phosphonocarboxylic acid such as α-methylphosphonosuccinic acid, or an alkali metal salt or alkanolamine salt thereof. . (4) Amino acids such as aspartic acid, glutamic acid, and glycine, or their alkali metal salts or alkanolamine salts. (5) nitrilotriacetic acid, iminodiacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, glycol etherdiaminetetraacetic acid, hydroxyethyliminodiacetic acid,
Aminopolyacetic acid such as triethylenetetramine hexaacetic acid and diencoric acid, or an alkali metal salt or alkanolamine salt thereof. (6) Organic acids such as diglycolic acid, oxydisuccinic acid, carboxymethyloxysuccinic acid, tartaric acid, oxalic acid, malic acid, oxydisuccinic acid, gluconic acid, carboxymethylsuccinic acid, carboxymethyltartaric acid, or alkali metal salts or alkanols thereof. Amine salt. (7) An alkali metal salt or alkanolamine salt of aluminosilicate represented by zeolite A. (8) Aminopoly (methylenephosphonic acid) and its alkali metal salts or alkanolamine salts, polyethylene polyamine poly (methylenephosphonic acid) and its alkali metal salts or alkanolamine salts.

And the like. In this case, the amount of the combined chelating agent used is 0 to 10% by weight, preferably 0.001.
~ 5% by weight.

(D) Bleach activator: The bleach activator used in the present invention is used to improve the bleaching performance of the article of the present invention. All conventionally known bleach activators that can be used for this purpose can be used, for example, alkanoyloxybenzenesulfonic acid or a salt thereof, alkanoyloxybenzoic acid or a salt thereof, tetraacetylethylenediamine or JP-A-63-258447, JPA
Examples thereof include the bleaching activators described in JP-A No. 63-315666 or JP-A No. 3-17196. The amount of bleach activator used is 0
It is 10% by weight, preferably 0.5 to 7% by weight.

The bleaching composition of the present invention is basically a composition prepared by dissolving or dispersing components (a) to (c), and optionally component (d) in water, but at low temperature. The hydrotrope agent may be blended for the purpose of improving the stabilization and freeze-restoration of the liquid and preventing the liquid separation at high temperature. Such a hydrotrope agent is generally a short-chain alkylbenzene sulfonate represented by toluene sulfonate, xylene sulfonate, etc.
Examples thereof include alcohols and polyhydric alcohols represented by ethanol, ethylene glycol, propylene glycol, hexylene glycol, glycerin, and the like, and alkylene glycol ethers represented by the following formula.

[0036]

[Image Omitted] R ¹ -O (QO) _s -R ² (In the formula, R ¹ represents an alkyl group of C _{1 to} C ₆ , R ² represents a hydrogen atom or a methyl group, and Q represents a carbon number of 2 to 3. S which represents an alkylene group: represents the number of 1 to 12.) The hydrotrope agent is 0 to 30 in the bleaching agent composition.
It can be blended in an amount of about wt%.

Further, in the bleach composition of the present invention,
Various compounds can be included. For example, phosphoric acid, which is known as a stabilizer of hydrogen peroxide, barbituric acid, uric acid, acetanilide, aminopolycarboxylic acids represented by oxyquinoline and phenacetin, and DL-α-tocophenol, gallic acid. Derivatives, butylated hydroxyanisole (BHA), 2,6-di-tert-
Butyl-4-methylphenol (BHT) and the like can be added. The amount of these stabilizers added depends on the concentration of hydrogen peroxide, but is usually about 0 to 5%, preferably 0.01
It is better to contain ~ 3%.

Further, in the present invention, a substance known as an anti-fading agent can be included. Such substances include phenylalanine, histidine, lysine, tyrosine, amino acid and amino acid salts such as methionine, and amino or imide compounds such as hydroxyiminodiacetic acid,
Further, a copolymer or the like of acrylonitrile and acrylonitrile having a quaternary ammonium group and one or more kinds of monomers copolymerizable therewith. Although amino acids have optical isomers, the optical isomers do not participate in the effect of the present invention. Therefore, it is possible to use chemically synthesized amino acids.

Tinopal CBS [manufactured by Ciba-Geigy] and Chinopearl SWN [Ciba
Geigy] and color index optical brightener 28,
An optical brightening agent such as 40, 61, 71 may be added in an amount of 0 to 5%.

A thickener may be added in an amount of 0 to 20% for the purpose of increasing the viscosity of the composition and improving the usability. Generally, polyacrylic acid salts, acrylic acid-maleic acid copolymers, carboxymethylcellulose derivatives, synthetic polymers such as methylcellulose and hydroxymethylcellulose, natural polymers such as xanthan gum, guar gum and kerzan, and water-swelling clay minerals such as montmorillonite and bee gum. And so on. Further, as described in JP-A-1-319600, it is also possible to give viscoelastic rheological properties by combining an amphoteric surfactant and an anionic surfactant.

The present invention further includes colorants such as dyes and pigments, fragrances, silicones, germicides, ultraviolet absorbers,
Suitable amounts of various trace additives such as inorganic electrolytes (0 to about 2 each)
%) Can be blended. In addition, as the dye, an acid dye having resistance to hydrogen peroxide in an acid solution is particularly preferable.

Further, in the composition of the present invention, conventionally known enzymes (cellulase, amylase, protease, lipase, etc.) can be added, if necessary, in order to improve the bleaching performance.

[0043]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

A container having the shape shown in FIG. 3 was obtained by molding a container from the thermoplastic resin and pigment shown in Table 2. For each obtained container, the average thickness of the bottom of the container was measured by the following method, the flatness of the inner wall of the body of the container was measured by the following method, and the gas permeability was determined by the following method. It was measured.
Furthermore, each container was filled with the liquid bleaching agent composition having the composition shown in Table 1 and sealed, and the swelling of the container after storage was evaluated by the following method. The results are shown in Table 2.

Method for measuring average wall thickness at the bottom of the container The container bottom was cut into a vertical and horizontal cross as shown in FIG. 4 (a, b), and the thickness of the cross section was measured with a total of 5 calipers and averaged. Takes a value. In FIG. 4, the part marked with “X” is the part where the thickness was measured.

Measurement of Flatness of Inner Wall of Container Body As shown in FIG. 5, the major axis (X) and the minor axis (Y) of the container cross section are measured and calculated by the following formula.

[0047]

[Equation 1]

Measurement of Gas Permeability of Container (1) Measurement of Oxygen and Carbon Dioxide Permeability Each gas was filled in a container, and the permeability was measured by the following measuring device under the condition of 23 ° C. for 24 hours. Measuring instrument: Gas Chromatography Co., Ltd. "Gas Permeation Tester" GPM-250 (2) Water Permeability Measurement Fill the container with water and measure the permeability with the following measuring instrument at 23 ° C for 24 hours. It was measured.

Measuring device: "Gas permeation tester" manufactured by Lyssy (France).

Evaluation of Container Deformation after Storage 600 ml of the liquid bleaching composition shown in Table 1 was filled and sealed in each container (full volume 780 ml) shown in Table 2 and stored at 40 ° C. for 30 days. Storage test The subsequent sample was taken out, and the bulge of the container was visually observed and evaluated. Here, the evaluation criteria for the swelling of the container and the change in odor are as follows. Each test was conducted in 10 containers, and the results are shown by the numbers of ○, Δ, and ×.・ Evaluation criteria for container bulge ○… No change △… Container swells slightly but does not feel bad ×… Container swells slightly and feels uncomfortable

[0051]

[Table 1]

[0052]

[Table 2]

1) High-density polyethylene resin; Showlex 5503D manufactured by Showa Denko KK 2) Low density polyethylene resin; Mirason 401 manufactured by Mitsui Polychemicals KK 3) Polystyrene resin; HIPS manufactured by Showa Denko KK

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a thermoplastic resin container used in the present invention.

FIG. 2 is a schematic cross-sectional view showing an example of a thermoplastic resin container used in the present invention.

FIG. 3 is a schematic view showing a thermoplastic resin container used in Examples.

FIG. 4 is a schematic view showing measurement points on the bottom of the container.

FIG. 5 is a schematic sectional view of a container body.

[Explanation of symbols]

 1 ... Cap 2 ... Inner wall 3 ... Body part 4 ... Bottom part 5 ... Handle X ... Long diameter Y ... Short diameter

Claims (2)

[Claims] 1. A thermoplastic resin container having a gas permeability within the range shown below (provided that the average thickness of the bottom of the container is
0.8-10 mm, the flatness of the inner wall of the body of the container is 1.0
A container having at least a part of 1.2. ) Is filled with a liquid bleaching agent composition shown below, to provide a bleaching treatment article. Gas permeability of thermoplastic resin container The gas permeability per 1 liter of internal volume is 24 hours, 23 ° C, (a) Oxygen is 1 ml / atm or more (b) Carbon dioxide is 2 ml / atm or more ( c) Water content is 0.1g or less. Liquid bleaching composition contains the following components (a) to (d). (A) component: hydrogen peroxide or organic peracid 0.1 to 10% by weight (B) component: surfactant 0.5 to 20% by weight (C) component: glycolic acid, lactic acid, glutaric acid and citric acid and their alkali metals At least one selected from the group consisting of salts 0.1 to 5% by weight (d) Component: bleach activator 0 to 10% by weight 2. A multi-layer structure comprising a thermoplastic resin container having a layer (B) made of a thermoplastic resin containing substantially no pigment inside a layer (A) made of a thermoplastic resin containing a pigment. The article for bleaching treatment according to claim 1, which is a container having the same.