JP2001019995A - Smear-removing agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a smear-removing agent that uses a hydrophilic and hydrophobic thermally reversible polymer substance as a stain-adsorbing component, promptly and surely removes stains by applying the smear remover to a part of the human body and surely rubbing off the remover to give the same washing effect as the usual water in no use of water. SOLUTION: This smear-removing agent comprises (A) a water-soluble alcohol and (B) a hydrophilic-hydrophobic thermally reversible polymer substance. This aqueous solution has a transition point in the range from the ambient temperature to the human body temperature. As the component B, is used a polymer with a weight-average molecular weight of 10,000-100,000,000, for example, a substance represented by the formula (R1 is H, methyl; A is alkylene, oxyalkylene; at least one of R2 and R3 is an alkyl, cycloalkyl or the like, and the rest is H or the like; n is 0 or 1). In a preferred embodiment, the component B is dissolved in a mixed solvent comprising the component A in an amount of 0.5-10 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stain remover for removing stains on a human body or an object without using water by applying it to a palm or the like and rubbing it.

[0002]

2. Description of the Related Art Heretofore, as a dirt remover for removing dirt adhering to a palm by applying it to a hand and rubbing both hands, a dissolving agent of polyvinyl alcohol in a mixed solvent of water and alcohol is known. Have been. However, this is a property of evaporating the solvent from a low-concentration solution while rubbing, and concentrating and solidifying the polyvinyl alcohol, and adsorbing and removing dirt on the concentrate, so that the dirt is completely removed. In addition, it takes a considerable amount of time, and the use of a hydrophilic material makes it difficult to remove stains on oily substances.

[0003]

DISCLOSURE OF THE INVENTION The present invention is intended to remove dirt quickly and reliably by applying it to a part of the human body such as a palm and rubbing it together, and to use the same cleaning method as ordinary cleaning without using water. The purpose of the present invention is to provide a stain remover capable of giving an effect.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to develop a new stain-removing agent which has improved the disadvantages of the conventional stain-removing agent. If a hydrophilic-hydrophobic thermoreversible polymer material is used as the material, it can be easily solidified by temperature rise due to body temperature and adsorb and remove dirt. At this time, it changes to hydrophobic, so that oily dirt can be easily removed. The inventors have found that the present invention is excluded, and have completed the present invention based on this finding.

That is, the present invention provides a soil remover comprising an aqueous solution containing a water-soluble alcohol and a hydrophilic-hydrophobic thermoreversible polymer material and having a transition temperature between ambient temperature and human body temperature. Things.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, an aqueous solution having a transition temperature between ambient temperature and human body temperature in a hydrophilic-hydrophobic thermoreversible polymer substance is used as a component for adsorbing and removing dirt. It is necessary to use what gives. The hydrophilic-hydrophobic thermoreversible polymer substance used here is, for example, a compound represented by the general formula

Embedded image (Wherein R ¹ is a hydrogen atom or a methyl group, A is an alkylene group or an oxyalkylene group, at least one of R ² and R ³ is an alkyl group, a cycloalkyl group or an alkoxyalkyl group, and the remainder is a hydrogen atom. ² and R ³ may be linked directly or via an oxygen atom to form a heterocyclic ring with the nitrogen atom to which R ² and R ³ are bonded, and n is 0
Or 1) is obtained by polymerizing or copolymerizing the unsaturated amide represented by the formula (1) alone or in combination of two or more.

The unsaturated amide represented by the general formula (I)
In R^TwoAnd R^ThreeAmong the alkyl groups,
A linear, branched or cyclic alkyl group having 1 to 10 carbon atoms
Preferred are mentioned. Such as, for example,
Methyl group, ethyl group, n-propyl group, isopropyl
Group, n-butyl group, isobutyl group, sec-butyl group,
tert-butyl, pentyl, hexyl, octyl
Group, cyclopropyl group, cyclobutyl group, cyclopen
Examples include a tyl group and a cyclohexyl group. Also, R
^TwoAnd R^ThreeAmong the alkoxyalkyl groups, carbon
Linear, branched, or cyclic alkoxyalkyl of several 2 to 10
Are preferred. Such a thing is, for example,
Cimethyl group, methoxyethyl group, methoxypropyl group,
Ethoxymethyl group, ethoxyethyl group, ethoxypropyl
Group, isopropoxymethyl group, isopropoxyethyl
Group, isopropoxypropyl group, cyclopropoxymethyl
Group, 2,2-dimethoxyethyl group, 1-methyl-2-
Methoxyethyl group, 1-methoxymethylpropyl group,
And a ethoxyethoxypropyl group. This R ^Two
And R^ThreeMay be the same or different
And also bond to each other to form a nitrogen atom
It may form a heterocycle as a child.

Accordingly, examples of such unsaturated amides represented by the general formula (I) include N-ethylacrylamide, Nn-propylacrylamide, N-isopropylacrylamide, N-cyclopropylacrylamide, N, N -Diethylacrylamide, N-methyl-N-ethylacrylamide, N-methyl-NN-propylacrylamide, N-methyl-N-isopropylacrylamide, N-acryloylpiperidine, N-acryloylpyrrolidine, N-acryloylmorpholine,
N-methoxypropylacrylamide, N-ethoxypropylacrylamide, N-isopropoxypropylacrylamide, N-ethoxyethylacrylamide, N
-(2,2-dimethoxyethyl) -N-methylacrylamide, N-1-methyl-2-methoxyethylacrylamide, N-1-methoxymethylpropylacrylamide, N-di (2-methoxyethyl) acrylamide, N
N-2-methoxyethyl-Nn-propylacrylamide, N-2-methoxyethyl-N-ethylacrylamide, N-2-methoxyethyl-N-isopropylacrylamide, N-methoxyethoxypropylacrylamide, N-tetrahydrofurfurylacrylamide , N-
(1,3-dioxolan-2-yl) methylacrylamide, N-methyl-N- (1,3-dioxolan-2-yl)
Yl) methylacrylamide, N-cyclopropylacrylamide, N-pyrrolidinomethylacrylamide, N
-Piperidinomethylacrylamide, N-2-morpholinoethyl acrylate, N-2-morpholinoethoxyethyl acrylate and the corresponding methacrylate. In addition, 8-acryloyl-1,4-
Spiro-type compounds such as dioxa-8-azaspiro [4,5] decane can also be used. The hydrophilic-hydrophobic thermoreversible polymer used in the present invention can also be obtained by copolymerizing the unsaturated amide represented by the general formula (I) with another monomer.

As described above, monomers usable in combination with the unsaturated amide of the general formula (I) include unsaturated carboxylic acids such as acrylic acid and methacrylic acid, methyl acrylate, ethyl acrylate and n-acrylate. Butyl acrylate, tert-butyl acrylate, 2-ethylhexyl acrylate, 2-acetoacetoxypropyl acrylate, 2-acetoacetoxypropyl acrylate, 3-acetoacetoxypropyl acrylate, 4
Acrylates such as -cyanoacetoacetoxyethyl acrylate, 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate and the corresponding methacrylates, acrylamides such as acrylamide, N-methylolacrylamide, N-hydroxypropylacrylamide And corresponding methacrylamides, N-acryloylbenzhydrazides,
Unsaturated hydrazides such as N-methacryloylbenzhydrazide, acrylonitrile, unsaturated nitriles such as methacrylonitrile, vinyl acetate, vinyl chloride, styrene, α-methylstyrene, N-vinylimidazole,
Examples include vinyl compounds such as vinyl methyl ether and vinyl ethyl ether. These monomers may be used alone or in combination of two or more. N-acryloylbenzhydrazide, N-methacryloylbenzhydrazide and N
-Copolymerized vinylimidazole is characterized by forming a copper chelate compound. When these monomers are used, they are preferably used in a proportion not exceeding 70 parts by weight per 100 parts by weight of the unsaturated amide represented by the general formula (I). If it exceeds this, reversible hydrophilic-hydrophobic transition is not performed.

In the unsaturated amide represented by the above general formula (I) or a polymer or copolymer of the unsaturated amide and the other monomer, a part of the constituent units of the molecular chain is replaced with a hydrophilic group and a hydrophobic group. When substituted with a surfactant type monomer unit having a functional group, a hydrophilic-hydrophobic thermoreversible polymer material showing a remarkable viscosity increase at a transition temperature or higher is obtained. It is suitable as.

The monomers forming the above-mentioned surfactant type monomer unit having a hydrophilic group and a hydrophobic group include an anionic surfactant type monomer and a cationic surfactant type monomer. However, any of the dirt-adsorbing components of the present invention can be used. The anionic surfactant type monomer therein is a compound having a radical polymerizable ethylene bond in the molecule and a hydrophobic group and an anionic hydrophilic group at the same time, and has such a requirement. There is no particular limitation as long as there is.

As such a compound, for example,

Embedded image (Wherein R ′ is a higher alkyl group, A ′ is an alkylene group,
M is an alkali metal or ammonium group, and n is an integer of 2 to 30) glycerol-1-allyl-
3-alkylphenyl-2-polyoxyethylene sulfate, general formula

Embedded image Wherein R ′ and M in the formula are the same as defined above, an alkenyl sulfosuccinic acid ester salt represented by the general formula:

Embedded image Wherein R ″ is a hydrogen atom or a methyl group, A ′, M and n
Is the same as above), a polyoxyethylene (meth) acrylate sulfate salt represented by the general formula:

Embedded image (Wherein R 'and M in the formula are the same as described above), and the like.

The anionic surfactant type monomer can be obtained as a commercial product. That is, the polyoxyethylene alkyl alkenyl phenyl ether sulfate ester type compound is, for example, “AQUALON HS-0”
5, "AQUALON HS-10", "AQUALON HS-
Glycerol (1) -allyl-3-alkylphenyl (2) -polyoxyethylene sulfate type compound as "20", "AQUALON HS-1025" [all manufactured by Daiichi Kogyo Seiyaku Co., Ltd.] Adecaria Soap S
E-10N "," Adecaria Soap SE-20N ",
“Adecaria Soap SE-30N” [all manufactured by Asahi Denka Co., Ltd.] and alkylsulfosuccinic acid alkenyl ether salt type compounds are, for example, “Latemul S-120”, “Latemul S-120A”, “Latemul S-180” As “Latemul S-180A” (manufactured by Kao Corporation), an alkylsulfosuccinic acid alkenyl ester salt-type reactive surfactant is, for example, “Eleminol JS-2” [Co., Ltd.]
As a product of Sanyo Chemical Co., Ltd., a methylenebispolyoxyethylene alkylphenylalkenyl ether sulfate type compound is, for example, "Antox MS-60" [manufactured by Nippon Emulsifier Co., Ltd.]. For example, as “Latemul ASK” (manufactured by Kao Corporation), a polyoxyethylene acrylate sulfate ester type compound is, for example, “Eleminol RS-
30 "(manufactured by Sanyo Chemical Co., Ltd.), and an acrylic acid sulfoalkyl ester salt type compound is, for example," Antox MS-2N "[manufactured by Nippon Emulsifier Co., Ltd.]. , Mono- or di- (glycerol-1-alkylphenyl-3-allyl-2-polyoxyalkylene ether) phosphoric acid ester salt-type compounds include, for example, “H-333”
0PL "[manufactured by Daiichi Kogyo Seiyaku Co., Ltd.].

The cationic surfactant is a monomer having a cationic hydrophilic group in place of the anionic hydrophilic group in the above anionic surfactant monomer.

Embedded image Or

Embedded image (Wherein R ⁴ , R ⁵ and R ⁶ are lower alkyl groups, X ⁻ is an anion, and R ″, A ′ and n are the same as described above);

Embedded image Or

Embedded image (Wherein R ⁴ , R ⁵ , R ⁶ , X ⁻ , R ″, A ′ and n are the same as those described above), represented by the general formula:

Embedded image Or

Embedded image (In the formula, Ar is an arylene group, R ⁴ , R ⁵ , R ⁶ , X ⁻ ,
A ′ and n are the same as described above), and a cationic styrene derivative represented by the general formula:

Embedded image (Wherein R ⁴ , R ⁵ , R ⁶ , X ⁻ and n are as defined above), and the like. Among such compounds, particularly preferred are hydrophobic compounds such as ω-nonadecenyltrimethylammonium chloride or bromide, ω-hexadecenyltrimethylammonium chloride or bromide, ω-tetradecenyltrimethylammonium chloride or bromide. It has a long chain having 12 or more carbon atoms having an ethylene bond at a terminal as a functional group. These surface active monomers may be used alone or in combination of two or more.

The surface active monomer unit having a hydrophilic group and a hydrophobic group in the above-mentioned hydrophilic-hydrophobic thermoreversible polymer substance is contained in an amount of 0.001 to 10 mol% based on all monomer units. , Preferably in a ratio of 0.01 to 8 mol%. If the amount of the surface active monomer unit is smaller than this, it is difficult to increase the molecular weight, and if it is larger than this, the original property of heat sensitivity is impaired.

In the present invention, the hydrophilic-hydrophobic thermoreversible polymer substance used as a dirt-adsorbing component may be used alone or in combination of two or more. These are water-soluble below the transition temperature when made into an aqueous solution,
At higher temperatures, it becomes water-insoluble and shows the property of solidifying. In order to show such properties at a low concentration, those having a weight average molecular weight of 1,000,000 or more are preferable, but when used at a high concentration, those having a weight average molecular weight of less than 1,000,000 are preferred. , For example, about 10,000 can also be used. However, if the molecular weight is too high, the viscosity becomes high even below the transition temperature, making it difficult to handle. Therefore, the upper limit of the weight average molecular weight is preferably about 10,000,000. If this range is represented by the intrinsic viscosity [η] at 30 ° C., the preferable range is 0.01 to 6.0. Particularly preferred in the present invention are those obtained by polymerizing or copolymerizing a predetermined monomer in the presence of an anionic or cationic surfactant, or a copolymer containing an anionic or cationic surfactant. It is. Since these have a high molecular weight, they can be used as a low-concentration aqueous solution, and since they have a surfactant effect, they can efficiently remove dirt.

The water-soluble alcohol used in the present invention is preferably ethyl alcohol. In addition, methyl alcohol or a mixture of methyl alcohol and ethyl alcohol, or propyl alcohol, isopropyl alcohol, ethylene glycol, glycerin, etc. And the like can be used.

The stain remover of the present invention is prepared by dissolving a required amount of a hydrophilic-hydrophobic thermoreversible polymer in a mixed solvent consisting of these water-soluble alcohols and water. The mixing ratio between the water-soluble alcohol and water is usually selected in the range of 1:10 to 1: 1.

In the stain removing agent of the present invention, a hydrophilic-hydrophobic thermoreversible polymer substance is contained in a mixed solvent comprising a water-soluble alcohol and water in an amount of 0.5 to 10% by weight, preferably 1 to 5% by weight. It is used by dissolving to a concentration of weight%. If the concentration is lower than this, it takes time to rub together to form small lumps. If the concentration is higher than this, the viscosity is large and it is difficult to use.

The stain remover of the present invention includes the hydrophilic-
It is preferable to contain a bactericidal component in addition to the hydrophobic thermoreversible polymer substance and the water-soluble alcohol. Such bactericidal components include hydrogen peroxide, hypochlorous acid and its alkali metal or alkaline earth metal salts, phenol, cresol, iodine, benzalkonium chloride, benzethonium chloride, chlorhexidine, p-toluenesulfonchloramine salt , 2- (2-furyl) -3- (5-nitro-2-
Furyl) acrylamide, various sulfa drugs, antibiotics such as penicillin and tetracycline. These sterilizing components are added in the range of 0.05 to 5% by weight based on the total weight of the disinfectant according to the purpose of use of the present invention. In addition, ethyl alcohol or isopropyl alcohol used as a water-soluble alcohol can also be used as a bactericidal component. Further, as a hydrophilic-hydrophobic thermoreversible polymer substance, a substance having antibacterial property itself, for example, a copolymer containing a cationic surfactant monomer as a monomer unit or a copolymer prepared by chelating copper. When a combination or a mixture of these with another polymer or copolymer is used, the blending of the sterilizing component can be omitted.

The hydrophilic-hydrophobic thermoreversible polymer used as a dirt-adsorbing component in the present invention is produced by radical polymerization. At this time, a peroxide such as hydrogen peroxide is used as a radical polymerization initiator. Use an excessive amount of a substance, or use a cationic surfactant as an emulsifier,
If these are used while being contained in the polymerization product, the same effect as when a bactericidal component is added will be obtained, and the cationic monomer as a surfactant type monomer unit having a hydrophilic group and a hydrophobic group will be obtained. Hydrophilicity containing a hydrophilic surfactant type monomer unit-
If a hydrophobic thermoreversible polymer substance is used, the addition of a bactericidal component can be omitted.

The soil remover of the present invention may further include, if desired, a water-soluble resin such as polyvinyl acetate hydrolyzate, polyvinyl pyrrolidone, or poly (hydroxyalkyl acrylate), a coloring agent, a fragrance, and a preservative. Etc. can also be added.

By the way, the stain remover of the present invention is in a solution state when not in use, but when applied to a human body, it must have a function of raising the temperature to a transition temperature or higher, solidifying and adsorbing and removing dirt. Therefore, the transition temperature needs to be adjusted between the ambient temperature and the human body temperature. The ambient temperature in this case depends on the indoor and outdoor environment, air temperature, and the like.
It is 0 ° C or lower at the summit or in cold regions. The human body temperature is in the range of 36 to 37 ° C. for a healthy person, but slightly fluctuates depending on age and physical condition. Accordingly, the soil remover of the present invention is often adjusted to have a transition temperature in the range of 0 ° C to 36 ° C, preferably in the range of 10 ° C to 30 ° C.

The transition temperature of the aqueous solution of the hydrophilic-hydrophobic thermoreversible polymer substance varies depending on its composition, the type and amount of the added component, and generally tends to decrease as the amount of the added component increases. In particular, when the content of the water-soluble alcohol is increased, the transition temperature is significantly lowered. Therefore, it is advantageous to adjust the transition temperature by increasing or decreasing the amount of the water-soluble alcohol.

The use form of the stain remover of the present invention includes:
When there is a need to remove dirt in areas where water is not available, such as mountainous areas, desert areas, stricken areas, or when machine oil plants are prone to oil stains, a small amount of this must be dripped into the palm of the hand to clean the human body. Rub where it is. When the friction is continued several times, the alcohol in the components volatilizes and the dirt-adsorbed components are concentrated, and at the same time, the temperature of the dirt-removing agent rises above the transition temperature due to body temperature, and the high-molecular substance transitions to hydrophobic Solidifies to form small lumps that adsorb dirt. Therefore, by brushing off these lumps,
Dirt attached to the human body can be removed, and the same cleaning can be performed with a small amount of use as in the case of washing with a large amount of water without using water.

Since the stain removing agent of the present invention utilizes the property of transition from hydrophilicity to hydrophobicity (that is, lipophilicity), there is an advantage that oily stains can be easily removed. Further, since a large amount of heat is generated when changing from a liquid to a solid, there is also an advantage that when used in a mountain or a cold region, frostbite of a limb can be prevented.

[0027]

Next, the present invention will be described in more detail with reference to examples.

The wiping performance in each example was measured by the following method. Wipeability: A soil forming agent prepared by adding 1 g of machine oil and 10 g of water to 10 g of ordinary soil and kneading the mixture is applied to a palm of one hand in a circular shape having a diameter of 20 mm, and left for 1 hour to dry. , Forming an artificial stain. Subsequently, 0.5 g of a predetermined stain remover was dropped on the artificial stain, and both hands were rubbed 20 times. Then, the state of removal of the artificial stain was visually observed and evaluated according to the following criteria. Very good: Artificial dirt is completely removed. Good: Artificial dirt is removed but slight residue is found. Bad: Soil is removed but oil remains. Very poor: Artificial dirt is hardly removed.

Reference Example 1 In a 500 ml Erlenmeyer flask equipped with a U-tube equipped with a capillary stopper and a condenser, 200 ml of distilled water and N-isopropylacrylamide (NIPAA) of various ratios were added.
m) and t-butylacrylamide (tBuAAm) in a mixture of 27 g and glycerol-1-allyl-3-alkylphenyl-2-polyoxyethylene sulfate salt type reactive surfactant [trade name, manufactured by Asahi Denka Co., Ltd. 0.7 g of “Adecaria Soap SE-10N”] and vigorously passed nitrogen gas for 30 minutes. Next, 0.05 g of ammonium persulfate (AP) was added, and the mixture was heated to 60 ° C. while stirring under a nitrogen stream to initiate polymerization. After performing polymerization at 60 ° C. for 2 hours, the polymerization was stopped by blowing air,
A copolymer was produced. After completion of the polymerization, the reaction solution was cooled to a transition temperature or lower and then heated to precipitate a copolymer. Next, the precipitated copolymer was dissolved in pure water and freeze-dried to obtain a copolymer. Relationship between the content of t-butylacrylamide (shown as 10 mol% of tBuAAm) in the mixture of N-isopropylacrylamide and t-butylacrylamide thus obtained and the transition temperature (° C.) of the obtained copolymer Is shown as a graph in FIG. As can be seen from this figure, the transition temperature can be changed by changing the component ratio in the monomer mixture.

Reference Example 2 A mixed solvent of ethyl alcohol or methyl alcohol and water having different mixing ratios was mixed with a weight-average molecular weight of 6,200,00.
0 poly (N-isopropylacrylamide) at 10 ° C
To prepare five 5% by weight solutions. For these solutions, the relationship between the alcohol content and the transition temperature was investigated, and is shown as a graph in FIG. In the figure, A is for methyl alcohol, and B is for ethyl alcohol. As can be seen from this figure, as the proportion of ethyl alcohol or methyl alcohol in the mixed solvent increases, the transition temperature of the hydrophilic-hydrophobic thermoreversible polymer decreases.

Example 1 Poly (N-isopropylacrylamide) was dissolved in a mixture of water and ethyl alcohol at a ratio of 10: 1 to give a concentration of 0.5% by weight, 1% by weight, 2% by weight, and 3% by weight. , 4%, 5% and 10% by weight of the seven solutions were prepared,
0.1% by weight of a disinfectant (benzalkonium chloride) and 0.05% by weight of a fragrance (geraniol) were added thereto to produce a disinfectant having a scent of roses and a disinfectant.
Table 1 shows the results of evaluating the wiping properties of these stain removers and the time until the stain removers were removed. For comparison, an evaluation of a mixture of water and ethyl alcohol not containing poly (N-isopropylacrylamide) is also shown.

[0032]

[Table 1]

Example 2 86.5 mol% of N-isopropylacrylamide and N-
Copolymer 3 comprising 13.5 mol% of vinylimidazole
g was dissolved in 97 g of a mixture of water and ethyl alcohol at a ratio of 10: 1 to prepare a 3% by weight solution, and 0.05 g of a fragrance (hinokitiol) was further added thereto to remove stains having a cypress-like aroma. An agent was manufactured. The transition temperature was 25 ° C., and the wiping properties were extremely good.

Example 3 N-isopropylacrylamide 98.9 mol% and glycerol-1-allyl-3-alkylphenyl-2-polyoxyethylene sulfate salt type reactive surfactant [manufactured by Asahi Denka Co., Ltd. Name "Adecaria Soap SE-1"
0N "] of 1.1 mol% was dissolved in a mixed solvent consisting of 85% by weight of water and 15% by weight of ethyl alcohol to prepare solutions having concentrations of 2% by weight and 5% by weight. Next, in each of these solutions, a fragrance (citral)
0.05% by weight was added to produce a stain remover having a lemon-like aroma. The transition temperature was 25 ° C., and the wiping properties were all very good.

EXAMPLE 4 70 mol% of N-isopropylacrylamide and N, N-
A copolymer composed of 30 mol% of diethylacrylamide was dissolved in a mixture of water and ethyl alcohol at a ratio of 5: 1 to a concentration of 5% by weight, and 100 ml of the solution was added to an aqueous solution of hydrogen peroxide (concentration: 30% by weight) 1m
l and a perfume (cinnamon alcohol) 0.05 g were added to produce a bactericidal soil remover having a hyacinth-like aroma. The transition temperature was 25 ° C., and the wiping properties were extremely good.

[0036]

According to the present invention, it is not necessary to use water at all in areas where water is scarce, and it is possible to completely remove palms and other dirt attached to the human body with a small amount of use, and even sterilize. There is provided a soil remover that can also be performed.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between the content ratio of t-butylacrylamide and the transition temperature in a copolymer of N-isopropylacrylamide and t-butylacrylamide.

FIG. 2 is a graph showing the relationship between the alcohol content and the transition temperature when poly (N-isopropylacrylamide) is dissolved in a mixed solvent of water and alcohol.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoji Ito 1-1-1, Higashi, Tsukuba, Ibaraki Pref., National Institute of Advanced Industrial Science and Technology (72) Inventor Akira Agata 2-105-5 Nihonbashi, Chuo-ku, Tokyo 2 SK Building, 9th floor, Patent Capital Corporation (72) Inventor Satoshi Nakazato 2-10-5, Nihonbashi, Chuo-ku, Tokyo 2nd SK Building, 9th floor, Patent Capital Corporation F-term (reference) 4C083 AC072 AC102 AC692 AD011 AD072 AD532 BB48 CC22 CC50 DD22 EE11 4H003 AE05 BA12 DA02 EB28 ED02 ED28 FA34

Claims (4)

[Claims] 1. A soil remover comprising an aqueous solution containing a water-soluble alcohol and a hydrophilic-hydrophobic thermoreversible polymer substance and having a transition temperature between ambient temperature and human body temperature. 2. The method according to claim 1, wherein the hydrophilic-hydrophobic thermoreversible polymer substance is 1
2. A soil remover according to claim 1, having a weight average molecular weight in the range of from 0000 to 10,000,000. 3. The soil remover according to claim 1, wherein the hydrophilic-hydrophobic thermoreversible polymer is contained at a concentration of 0.5 to 10% by weight. 4. The method according to claim 1, further comprising a bactericidal component.
The stain remover according to 2 or 3.