Solid detergent composition

Abstract

A solid cleaning agent composition including (A) a cationic polymer and (B) an anionic surfactant, wherein (A) the cationic polymer and (B) the anionic surfactant satisfy requirement I and requirement II indicated below. Requirement I: the transmittance (optical path length of 1 cm, 25ºC) of light having a wavelength of 655 nm in a mixture 1 obtained by mixing (A) the cationic polymer, (B) the anionic surfactant, and water at a weight ratio of 0.5:12:87.5 is 95% or more. Requirement II: the transmittance (optical path length of 1 cm, 25ºC) of light having a wavelength of 655 nm in a diluted solution obtained by mixing the mixture 1 and water at a weight ratio of 1:4 is 90% or less.

Description

[Technical field]

[0001] The present invention relates to a solid detergent composition having a high conditioning effect. [Background technology]

[0002] Conventionally, a solid detergent that is resistant to softening under high temperature and humidity conditions such as in a bathroom, and is resistant to cracking or breaking under dry conditions, and that retains its shape, has been known to contain polyethylene glycol, a detergent base of a higher fatty acid salt and / or an N-acylamino acid salt, a water-soluble cationic polymer, and a high-viscosity silicone in specific proportions (Patent Document 1).

[0003] Patent Document 1 discloses cationized hydroxycellulose (polyquaternium-10) and cationized guar gum as water-soluble cationic polymers. However, these have a low dissolution rate in water, i.e., it is difficult for them to dissolve in water in a short time. Therefore, when used in a solid detergent, it is difficult for them to dissolve in water within the time required for washing or cleaning hair and to fully exert their conditioning effect.

[0004] Conditioning effects, such as reducing hair creaking and providing smoothness and ease of use during rinsing, are achieved by diluting the shampoo with water during the hair washing process, and the anionic surfactant and cationic polymer form a water-insoluble complex called a coacervate, which adheres to the hair. However, when cationic hydroxycellulose or cationic guar gum is used as the cationic polymer as in Patent Document 1, coacervate is difficult to form in a system in which no or only a small amount of amphoteric surfactant or inorganic salt is added, and the conditioning effect is not fully achieved. Amphoteric surfactants and inorganic salts are widely used in liquid detergents, but in solid detergents, their deliquescent nature makes it difficult to maintain the solid state, so they must not be used or must be used in as small an amount as possible (Comparative Example 4 in Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-257016 A [Patent Document 2] JP 2016-188182 A Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a solid detergent composition which can form a coacervate even in a formulation which does not contain an amphoteric surfactant and an inorganic salt or which contains only a small amount of these, and which can impart smoothness during washing and rinsing and a moist feeling after washing. [Means for solving the problem]

[0007] As a result of extensive investigations aimed at solving the above-mentioned problems, the inventors have found that the above-mentioned problems can be solved by a solid detergent composition in which the transmittance of a mixed liquid obtained by mixing the cationic polymer, an anionic surfactant, and water contained in the solid detergent composition in a specified ratio, and the transmittance of a diluted liquid obtained by diluting the mixed liquid with water, satisfy specified values. That is, the present invention relates to the following.

[0008] [1] A solid detergent composition comprising (A) a cationic polymer and (B) an anionic surfactant, wherein the (A) cationic polymer and the (B) anionic surfactant satisfy the following requirements I and II: Requirement I: The transmittance of light with a wavelength of 655 nm (optical path length 1 cm, 25°C) of 95% or more for a mixed liquid (hereinafter referred to as "mixed liquid 1") obtained by mixing (A) a cationic polymer, (B) an anionic surfactant, and water in a weight ratio of 0.5:12:87.5 Requirement II: The transmittance of light with a wavelength of 655 nm (optical path length 1 cm, 25°C) of the diluted solution obtained by mixing Mixture 1 and water in a weight ratio of 1:4 is 90% or less.

[0009] [2] The solid detergent composition according to [1], wherein the cationic polymer (A) is a copolymer containing a structural unit corresponding to the cationic vinyl monomer (a1) and a structural unit corresponding to the vinyl monomer (a2) represented by the following general formula (1) or (2): CH 2 =C(R 1 )-CO-NR 2 R 3 (1) (In the formula, R 1 represents a hydrogen atom or a methyl group, R 2 and R 3 each independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; R 2 and R 3 The sum of the carbon numbers is 1 to 4.) CH 2 =C(R 4 )-CO-NR 5 -(CH 2 ) a -OH (2) (In the formula, R 4 represents a hydrogen atom or a methyl group, R 5 represents a hydrogen atom, or an alkyl or hydroxyalkyl group having 1 to 4 carbon atoms, and a represents an integer of 1 to 4.

[0010] [3] The solid detergent composition according to [1] or [2], wherein the anionic surfactant (B) is a compound represented by the following general formula (4) and / or a salt thereof: RAX (4) (In the formula, R represents a linear or branched alkyl group, alkenyl group, or alkylphenyl group having 8 to 24 carbon atoms, A represents an oxyalkylene group or a divalent linking group containing an amide bond, and X represents a carboxyl group or a phosphate group.)

[0011] [4] The solid detergent composition according to any one of [1] to [3], wherein the anionic surfactant (B) is an amino acid-based anionic surfactant. Effect of the Invention

[0012] According to the present invention, there is provided a solid detergent composition which has shape retention and is unlikely to soften even under high temperature and high humidity conditions, such as in a bathroom, and is unlikely to crack or break even under dry conditions. When the solid detergent composition is diluted with water or the like during the process of washing hair or the like, a cationic polymer and an anionic surfactant form a water-insoluble coacervate, thereby effectively imparting smoothness during washing and rinsing and a moist feeling after washing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present invention will be described in detail below with reference to embodiments.

[0014] The solid detergent composition of the present invention is a solid detergent composition containing (A) a cationic polymer and (B) an anionic surfactant, and is characterized in that (A) the cationic polymer and (B) the anionic surfactant satisfy the following requirements I and II. That is, the solid detergent composition of the present invention contains (A) the cationic polymer and (B) the anionic surfactant in a combination that satisfies the following requirements I and II. Requirement I: The transmittance of light with a wavelength of 655 nm (optical path length 1 cm, 25°C) of 95% or more for a mixed liquid (hereinafter referred to as "mixed liquid 1") obtained by mixing (A) a cationic polymer, (B) an anionic surfactant, and water in a weight ratio of 0.5:12:87.5 Requirement II: The transmittance of light with a wavelength of 655 nm (optical path length 1 cm, 25°C) of the diluted solution obtained by mixing Mixture 1 and water in a weight ratio of 1:4 is 90% or less. In the present invention, a specific method for measuring the transmittance is as shown in the Examples section below. In the following, mixed solution 1 in requirement I may be referred to as the "undiluted solution," and the diluted solution obtained by mixing mixed solution 1 and water in a 1:4 (weight ratio) in requirement II may be referred to as the "5-fold diluted solution."

[0015] [Requirement I] The (A) cationic polymer and (B) anionic surfactant contained in the solid detergent composition of the present invention satisfy Requirement I above. The above-mentioned requirement I means that a highly transparent stock solution can be prepared in a combination of (A) a cationic polymer and (B) an anionic surfactant, i.e., the solubility in water is excellent. The transmittance of requirement I is 95% or more, preferably 97% or more, and more preferably 98 to 100%. If the transmittance of requirement I is 95% or more, (A) the cationic polymer and / or (B) the anionic surfactant are easily dissolved in water, and such a combination is likely to form fine and uniform coacervates. Therefore, when used as a detergent, it is evenly adsorbed to hair, skin, etc., and expresses smoothness. If the transmittance of requirement I is less than 95%, (A) the cationic polymer and / or (B) the anionic surfactant are difficult to dissolve in water, and such a combination is inferior in coacervate formation ability.

[0016] [Requirement II] The (A) cationic polymer and (B) anionic surfactant contained in the solid detergent composition of the present invention satisfy both the above requirement I and requirement II. Requirement II means that when a solid detergent composition containing (A) a cationic polymer and (B) an anionic surfactant is diluted with water during washing or rinsing, a coacervate can be formed by interaction between (A) the cationic polymer and (B) the anionic surfactant, the transmittance is reduced by the formation of the coacervate, and excellent washing and conditioning effects can be obtained by the formation of the coacervate. From the viewpoint of the ability to form coacervate, the transmittance of requirement II is 90% or less, preferably 80% or less, more preferably 50% or less, and further preferably 20% or less. There is no particular lower limit for the transmittance of requirement II, and it may be 0%. In a combination of (A) a cationic polymer and (B) an anionic surfactant having a transmittance of more than 90% as required by requirement II, the formation of coacervate is insufficient or no coacervate can be formed, and excellent cleaning and conditioning effects cannot be obtained.

[0017] [(A) Cationic polymer] The cationic polymer (A) used in the present invention is not particularly limited as long as it satisfies requirements I and II in combination with the anionic surfactant (B).

[0018] The (A) cationic polymer may be used alone or in combination of two or more kinds.

[0019] The cationic polymer (A) used in the solid detergent composition of the present invention preferably forms a coacervate even in a system in which no amphoteric surfactant is blended. For this reason, the cationic polymer (A) is preferably a copolymer containing a structural unit corresponding to the cationic vinyl monomer (a1) and a structural unit corresponding to the vinyl monomer (a2) represented by the following general formula (1) or (2) (hereinafter, sometimes referred to as "copolymer (A)"). The vinyl monomer is a monomer capable of vinyl polymerization. The cationic vinyl monomer is a vinyl monomer having one or more cationic groups and no anionic groups or having anionic groups in a number less than the number of cationic groups. CH 2 =C(R 1 )-CO-NR 2 R 3 (1) (In the formula, R 1 represents a hydrogen atom or a methyl group, R 2 and R 3 each independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; R 2 and R 3 The sum of the carbon numbers is 1 to 4.) CH 2 =C(R 4 )-CO-NR 5 -(CH 2 ) a -OH (2) (In the formula, R 4 represents a hydrogen atom or a methyl group, R 5 represents a hydrogen atom, or an alkyl or hydroxyalkyl group having 1 to 4 carbon atoms, and a represents an integer of 1 to 4.

[0020] In the copolymer (A), the constituent unit corresponding to the cationic vinyl monomer (a1) easily forms a coacervate (complex) with the anionic surfactant (B) in the solid detergent composition. The coacervate thus formed exists in a redispersed state, and adheres to and uniformly coats the hair, thereby imparting smoothness, silkiness, and softness to the skin and hair.

[0021] On the other hand, in the copolymer (A), the structural unit corresponding to the vinyl monomer (a2) represented by the general formula (1) has an amide bond, and the structural unit corresponding to the vinyl monomer (a2) represented by the general formula (2) has an amide bond and a hydroxyl group, and the hydrophilicity derived from these has the effect of imparting hydrophilicity to the copolymer (A). This is thought to maintain the water solubility of the copolymer (A) even when the copolymer (A) forms a coacervate with the anionic surfactant (B). Furthermore, those having an amide bond are thought to have the effect of making the coacervate more easily adsorbed to the skin or hair due to the hydrogen bonding action with the surface of the skin or hair.

[0022] The proportion of the cationic vinyl monomer (a1) in the total of the constituent units constituting the copolymer (A) is preferably 25 mol% or more. This allows the copolymer (A) to contain a sufficient amount of cationic groups, which makes it easier to form a coacervate with the anionic surfactant (B), increasing the amount of the surfactant adsorbed to the hair, and improving, for example, the smoothness and silkiness of the hair when rinsing, and the silky feeling and flexibility after drying.

[0023] On the other hand, the proportion of the constituent units corresponding to the vinyl monomer (a2) in all the constituent units constituting the copolymer (A) is preferably 75 mol% or less, which increases the density of the cationic groups in the copolymer (A) and allows the copolymer to form a more sufficient coacervate with the anionic surfactant (B), for example, more effectively maintaining smoothness during rinsing when washing hair.

[0024] For the purpose of forming a coacervate, the cationic equivalent of the copolymer (A) is preferably 1.3 meq / g or more, more preferably 1.8 meq / g or more, and even more preferably 2.0 meq / g or more. If the cationic equivalent is less than 1.3, requirement II tends not to be satisfied. If requirement I is satisfied, there is no upper limit to the cationic equivalent of the copolymer (A), but in consideration of the stickiness of the finished product and irritation to the skin, the cationic equivalent of the copolymer (A) is preferably 3.5 meq / g or less, more preferably 2.8 meq / g or less.

[0025] The weight-average molecular weight of the copolymer (A) is preferably 10,000 to 2,000,000, more preferably 100,000 to 1,000,000, and even more preferably 200,000 to 700,000. If the weight-average molecular weight is less than 10,000, there is concern about skin irritation. If the weight-average molecular weight is 100,000 or more, the coacervate generating ability is increased, and the amount of the coacervate adsorbed to hair and skin is also increased, making it easier to achieve smooth rinsing. If the weight-average molecular weight is more than 2,000,000, the hygroscopicity of the generated coacervate becomes very high, which tends to cause stickiness and poor usability. The weight average molecular weight of the copolymer (A) can be measured by gel permeation chromatography (using, for example, water / methanol / acetic acid / sodium acetate as the developing solvent).

[0026] In consideration of the solubility in water, the copolymer (A) preferably has a viscosity of 7000 mPa·s or less when made into a 10% by weight aqueous solution, more preferably 5000 mPa·s or less, even more preferably 1000 mPa·s or less, and particularly preferably 300 mPa·s or less. The viscosity herein is a value measured using a VISCOMETER BL manufactured by Toki Sangyo Co., Ltd., with a rotor No. 2 and a rotation speed of 30 rpm.

[0027] The copolymer (A) is usually obtained by polymerizing a cationic vinyl monomer (a1) and a vinyl monomer (a2) having structures corresponding to the respective structural units in a corresponding molar fraction.

[0028] <Vinyl monomer (a2)> The vinyl monomer (a2) is represented by the above general formula (1) or (2). The vinyl monomer (a2) is usually a nonionic vinyl monomer. As the vinyl monomer (a2), the monomer represented by the general formula (1) and the monomer represented by the general formula (2) may be used in combination.

[0029] In the general formula (1), R 1 is preferably a hydrogen atom. 2 ,R 3 Examples of the alkyl group having 1 to 3 carbon atoms include a methyl group, an ethyl group, a propyl group, and an isopropyl group. 2 and R 3 The sum of the carbon numbers of is preferably 2 or more and 4 or less, and most preferably 2. In the above general formula (2), a is preferably an integer of 1 to 3, and most preferably 2.

[0030] The vinyl monomer (a2) represented by the general formula (1) is not particularly limited as long as it is included in this formula, and examples thereof include alkylacrylamides such as N-methyl(meth)acrylamide, N-ethyl(meth)acrylamide, N-propyl(meth)acrylamide, and N-isopropyl(meth)acrylamide, and dialkylacrylamides such as N,N-dimethyl(meth)acrylamide and N,N-diethyl(meth)acrylamide (here, "(meth)acryl" represents acryl and methacryl). Among these, N-methyl(meth)acrylamide, N-ethyl(meth)acrylamide, N-propyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, and N,N-diethyl(meth)acrylamide are preferred because of the high solubility of the monomer in water and the high hydrophilicity of the resulting copolymer (A).

[0031] The vinyl monomer (a2) represented by the general formula (2) is not particularly limited as long as it is included in this formula, and examples thereof include N-hydroxyalkyl (meth)acrylamides such as N-hydroxyethyl (meth)acrylamide, N-hydroxypropyl (meth)acrylamide, and N,N-dihydroxyethyl (meth)acrylamide. Among these, N-hydroxyethyl (meth)acrylamide is preferred because the solubility of the monomer in water and the solubility of the resulting copolymer (A) in water are high.

[0032] The vinyl monomer (a2) may be used alone or in combination of two or more kinds.

[0033] <Cationic vinyl monomer (a1)> The cationic vinyl monomer (a1) is not particularly limited as long as it can achieve the object of the present invention, but for example, diallyl-based quaternary ammonium salts such as N,N-dimethyl-N,N-diallyl ammonium chloride, (meth)acrylic ester-based quaternary ammonium salts such as N-methacryloyloxyethyl-N,N,N-trimethyl ammonium chloride, (meth)acrylamide-based quaternary ammonium salts such as N-methacryloylaminopropyl-N,N,N-trimethyl ammonium chloride, amino acid-based cationic species such as the reaction product of L-arginine and glycidyl methacrylate, etc. can be exemplified, and among these, (meth)acrylic quaternary ammonium salts are more preferred. In particular, (meth)acrylic quaternary ammonium salts represented by the following general formula (3) are preferred.

[0034] CH 2 =C(R 5 )-CO-(O) c -(NH) 1-c -(CH 2 ) d -N + R 6 R 7 R 8 X - (3) (In the formula, R 5 represents a hydrogen atom or a methyl group, R 6 and R 7each independently represents an alkyl group, an aryl group, or an aralkyl group having 1 to 24 carbon atoms; R 8 is a hydrogen atom, an alkyl group having 1 to 24 carbon atoms, an aryl group, an aralkyl group, or -CH 2 -CH(OH)-CH 2 -N + R 9 R 10 R 11 Y - R 9 ~R 11 each independently represents an alkyl group, an aryl group, or an aralkyl group having 1 to 24 carbon atoms; X - and Y - each independently represents an anion, c represents 0 or 1, and d represents an integer of 1 to 10.

[0035] R 5 R is preferably a methyl group. 6 and R 7 Each of R is preferably a methyl group or an ethyl group, more preferably a methyl group. 8 R is preferably a methyl group or an ethyl group, more preferably a methyl group. 9 ~R 11 are each independently preferably a methyl group or an ethyl group, more preferably a methyl group. - and Y - Each of the anions represented by the following formula (1) is preferably a halogen ion, and more preferably a chloride ion, an iodide ion or a bromide ion. c is preferably 0. d is preferably an integer of 1 to 5, and more preferably 3.

[0036] Some examples of the cationic vinyl monomer (a1) represented by the general formula (3) include (meth)acrylic acid esters having a cationic group such as N-(meth)acryloyloxyethyl-N,N,N-trimethylammonium chloride, N-(meth)acryloyloxyethyl-N-ethyl-N,N-dimethylammonium monoethyl sulfate, N-(meth)acryloyloxyethyl-N,N,N-triethylammonium monoethyl sulfate, N-[3-{N'-(meth)acryloyloxyethyl-N',N'-dimethylammonium}-2-hydroxypropyl]-N,N,N-trimethylammonium chloride, and N-[3-{N'-(meth)acryloyloxyethyl-N',N'-diethylammonium}-2-hydroxypropyl]-N,N,N-triethylammonium chloride; N-(meth)acryloyloxyethyl-N,N,N-trimethylammonium chloride; and (meth)acrylamides having a cationic group such as N-(meth)acryloylaminopropyl-N,N,N-trimethylammonium chloride, N-(meth)acryloylaminopropyl-N-ethyl-N,N-dimethylammonium monoethyl sulfate, N-(meth)acryloylaminopropyl-N,N-diethyl-N-methylammonium chloride, N-(meth)acryloylaminopropyl-N,N-diethyl-N-methylammonium monomethyl sulfate, N-[3-{N'-(meth)acryloylaminopropyl-N',N'-dimethylammonium}-2-hydroxypropyl]-N,N,N-trimethylammonium chloride, and N-[3-{N'-(meth)acryloylaminopropyl-N',N'-diethylammonium}-2-hydroxypropyl]-N,N,N-trimethylammonium chloride.

[0037] Among them, N-(meth)acryloyloxyethyl-N,N,N-trimethylammonium chloride and N-(meth)acryloylaminopropyl-N,N,N-trimethylammonium chloride are preferably used, and N-(meth)acryloylaminopropyl-N,N,N-trimethylammonium chloride is particularly preferred. Most preferred is a combination of N-(meth)acryloyloxyethyl-N,N,N-trimethylammonium chloride and N-(meth)acryloylaminopropyl-N,N,N-trimethylammonium chloride.

[0038] As the cationic vinyl monomer (a1), it is preferable to use one having an amide bond, i.e., a monomer in which c=0 in the general formula (3). When the copolymer (A) has an amide bond, there is an advantage that it is more adsorbed to hair. That is, by having an amide bond, the cationic strength of the cationic functional group is increased, and the bond with the anionic surfactant (B) is strengthened, resulting in a higher adsorption to hair. This makes it possible to improve smoothness, particularly during rinsing, when using a solid detergent composition containing the copolymer (A).

[0039] The role of conditioning polymers incorporated in hair detergents is to provide smoothness during rinsing, a silky feeling after drying, and no stiffness after drying, but the most important of these is smoothness during rinsing. This is because, while the feeling after drying can be improved by treating with a rinse, conditioner, or leave-in out-bath treatment after treatment with a detergent, smoothness during rinsing cannot be compensated for by other methods. Therefore, conditioning polymers that provide excellent smoothness during rinsing are most preferable.

[0040] The structure corresponding to the cationic vinyl monomer (a1) can also be obtained by polymerizing a precursor of the cationic vinyl monomer (a1) with a vinyl monomer (a2) to form a copolymer, and then converting the copolymer into a structure having a corresponding cationic group using a cationizing agent.

[0041] Examples of the cationic vinyl monomer precursor include (meth)acrylic acid esters having a tertiary amine such as N-(meth)acryloyloxyethyl-N,N-dimethylamine and N-(meth)acryloyloxyethyl-N,N-diethylamine; and (meth)acrylamides having a tertiary amine such as N-(meth)acryloylaminopropyl-N,N-dimethylamine and N-(meth)acryloylaminopropyl-N,N-diethylamine.

[0042] Examples of the cationizing agent include alkyl halides such as methyl chloride, and cationic group-containing cationizing agents such as 3-chloro-2-hydroxypropyl-N,N,N-trimethylammonium chloride. The cationization reaction can be carried out, for example, by adding the cationizing agent to a polymer solution at 20 to 100° C. for 1 to 20 hours.

[0043] The cationic vinyl monomer (a1) or its precursor may be used alone or in combination of two or more kinds.

[0044] In one preferred embodiment of the present invention, as the cationic vinyl monomer (a1), a monomer (a1-1) in which c in the general formula (3) is 1 and a monomer (a1-2) in which c in the general formula (3) is 0 are used in combination. This has the advantage that when it is incorporated into a solid detergent composition, it further enhances effects such as smoothness during rinsing, ease of finger-combing during towel drying, smooth feeling after drying, no stiff feeling, and softness for skin and hair, particularly for untreated hair and damaged hair.

[0045] The reason why the combined use of the monomers (a1-1) and (a1-2) enhances the effect is not entirely clear, but is thought to be as follows. That is, since the monomer (a1-2) has an amide bond, it has the effect of making it easier for the coacervate with the anionic surfactant (B) to be adsorbed by the skin or hair due to the hydrogen bonding action with the skin or hair surface. On the other hand, by including a structural unit corresponding to the vinyl monomer (a1-1) having an ester bond, the state of the coacervate after adhering to the hair tends to be hydrophobic, and the state becomes closer to that of healthy hair, which enhances the effect of improving the feel of the hair, etc. Therefore, it is thought that the combined use of the monomers (a1-1) and (a1-2) will bring out the characteristics of both.

[0046] <Other monomers> The copolymer (A) may further contain structural units derived from other vinyl monomers. However, if an anionic functional group is present in the copolymer (A), it may hinder the formation of a coacervate with the anionic surfactant (B), so it is preferable that the copolymer has a small number of anionic functional groups (for example, 10% or less of the total functional groups), and it is more preferable that the copolymer does not substantially contain such groups. Here, "substantially does not contain" means that the copolymer does not exhibit anionicity at pH 3 to 8, for example.

[0047] Other vinyl monomers include esters of alcohols having 1 to 22 carbon atoms and (meth)acrylic acid, amides of alkylamines having 1 to 22 carbon atoms and (meth)acrylic acid, monoesters of ethylene glycol, 1,3-propylene glycol, etc. and (meth)acrylic acid, as well as esters in which the hydroxyl groups of these monoesters are etherified with methanol, ethanol, etc., nonionic monomers such as (meth)acroylmorpholine, amphoteric monomers such as betaine group-containing (meth)acrylic esters and betaine group-containing (meth)acrylamides, semi-polar monomers such as amine oxide group-containing (meth)acrylic esters and amine oxide group-containing (meth)acrylamides, and the like.

[0048] The content of the structural unit derived from the other vinyl monomer can be appropriately determined within a range that does not deviate from the gist of the present invention. For example, it can be appropriately determined within a range that does not impair the solubility and conditioning effect of the copolymer (A). The content of the structural unit derived from the other vinyl monomer is preferably 30% by weight or less, more preferably 20% by weight or less, in the copolymer (A).

[0049] The content of the constituent units corresponding to the cationic vinyl monomer (a1), the constituent units corresponding to the vinyl monomer (a2) having a hydroxyl group and an amide bond, and the constituent units derived from other vinyl monomers in the copolymer (A) can be determined by IR absorption of the hydroxyl group or amide bond site, the hydroxyl group or amide bond site, and the methyl group adjacent to the cationic group. 1 H-NMR, or 13 It can be measured by C-NMR or the like.

[0050] As the copolymer (A), preferably, a propyltrimonium chloride acrylamide / dimethylacrylamide copolymer, a propyltrimonium chloride acrylamide / ethyltrimonium chloride methacrylate / dimethylacrylamide copolymer, or an ethyltrimonium chloride methacrylate / hydroxyethylacrylamide copolymer is mentioned, more preferably, a propyltrimonium chloride acrylamide / dimethylacrylamide copolymer, a propyltrimonium chloride acrylamide / ethyltrimonium chloride methacrylate / dimethylacrylamide copolymer, and even more preferably, a propyltrimonium chloride acrylamide / ethyltrimonium chloride methacrylate / dimethylacrylamide copolymer is mentioned.

[0051] [(B) Anionic surfactant] The anionic surfactant (B) used in the present invention is not particularly limited as long as it satisfies requirements I and II in combination with the cationic polymer (A).

[0052] As the anionic surfactant (B) used in the present invention, a compound represented by the following general formula (4) and / or a salt thereof is preferably used, since it forms a coacervate together with the cationic polymer (A) even in a formulation that does not contain an amphoteric surfactant or an inorganic salt, or if it does contain such a surfactant, the amount of the anionic surfactant is very small. RAX (4) (In the formula, R represents a linear or branched alkyl group, alkenyl group, or alkylphenyl group having 8 to 24 carbon atoms, A represents an oxyalkylene group or a divalent linking group containing an amide bond, and X represents a carboxyl group or a phosphate group.)

[0053] The solid detergent composition containing the compound represented by the general formula (4) and / or a salt thereof and the copolymer (A) can wash the object gently without excessively removing oil from the object, and also improves the smoothness of highly damaged parts such as hair ends during rinsing, thereby providing an excellent conditioning effect.

[0054] Examples of the anionic surfactant (B) which is a compound represented by general formula (4) and / or a salt thereof include N-acylamino acids such as acyl sarcosine, acylalanine, acyl methyl-β-alanine, acyl glutamic acid, and salts thereof; alkyl ether carboxylic acids and salts thereof; mono- or dialkyl ether phosphate esters and salts thereof; mono- or dialkyl phenyl ether phosphate esters and salts thereof; polyoxyethylene alkyl sulfosuccinic acids and salts thereof; and the like.

[0055] Examples of the linear or branched alkyl group having 8 to 24 carbon atoms that can be used as R include lauryl, cocoyl, cetyl, myristyl, stearyl, behenyl, 2-ethylhexyl, and 2-octyldodecanyl. The number of carbon atoms in the alkyl group of R is preferably 10 or more, more preferably 12 or more. Also, it is preferably 18 or less, and more preferably 16 or less. Examples of the linear or branched alkenyl group having 8 to 24 carbon atoms include oleyl. The number of carbon atoms in the alkenyl group of R is preferably 12 or more, and preferably 20 or less. Examples of the alkylphenyl group include phenyl groups having linear or branched alkyl groups having 8 to 24 carbon atoms, such as octylphenyl, nonylphenyl, laurylphenyl, cetylphenyl, and stearylphenyl. The number of carbon atoms in the alkyl group of the alkylphenyl group is preferably 18 or less, more preferably 16 or less, and even more preferably 14 or less.

[0056] Among these, R is preferably an alkyl group having 8 to 24 carbon atoms, an oleyl group, an octylphenyl group, a nonylphenyl group, or a laurylphenyl group, more preferably an alkyl group having 8 to 24 carbon atoms, an oleyl group, or a nonylphenyl group, still more preferably an alkyl group having 10 to 18 carbon atoms, an oleyl group, or a nonylphenyl group, and particularly preferably an alkyl group having 12 to 16 carbon atoms, an oleyl group, or a nonylphenyl group.

[0057] As the (B) anionic surfactant, an amino acid-based anionic surfactant can be suitably used. Examples of the amino acid-based anionic surfactant include N-acylamino acid or a salt thereof. The N-acylamino acid or a salt thereof may be used alone or in combination of two or more. As the amino acid-based anionic surfactant, from the viewpoints of good foam quality that smoothly spreads on the skin and leaves hair and skin soft and moisturized after washing, at least one selected from the group consisting of N-lauroyl-L-glutamic acid, N-myristoyl-L-glutamic acid, N-coconut oil fatty acid acyl-L-glutamic acid, N-palm oil fatty acid acyl-L-glutamic acid, N-lauroyl-L-aspartic acid, N-coconut oil fatty acid acyl-L-glycine, N-coconut oil fatty acid acyl-L-alanine, N-palmitoyl-L-glutamic acid, N-stearoyl-L-glutamic acid, N-oleoyl-L-glutamine, N-coconut oil fatty acid sarcosine, N-lauroyl sarcosine, N-myristoyl sarcosine, N-oleoyl sarcosine, and salts thereof is preferred.

[0058] Examples of salts of N-acylamino acids include, from the viewpoint of ensuring foaming and foam quality, alkali metal salts such as sodium and potassium; alkaline earth metal salts such as calcium and magnesium; other organic salts such as aluminum and zinc; ammonium salts; organic amine salts such as monoethanolamine, diethanolamine, triethanolamine, AMP (2-amino-2-methyl-1-propanol), and 2-amino-2-hydroxymethyl-1,3-propanediol; and other organic salts such as basic amino acid salts such as arginine, lysine, histidine, and ornithine. More specifically, the salts of N-acylamino acids are preferably at least one selected from alkali metal salts, triethanolamine salts, and arginine salts, from the viewpoint of ensuring foaming and foam quality, irritation to hair and skin, and ease of availability, and are more preferably at least one selected from sodium salts, potassium salts, triethanolamine salts, and arginine salts, more preferably at least one selected from sodium salts and potassium salts, and even more preferably at least one selected from sodium salts and potassium salts.

[0059] In producing a solid detergent, the anionic surfactant (B) is required to have a high concentration in the product (preferably a solid), and sodium lauroyl sarcosine and the like are preferred in terms of ease of availability.

[0060] The role of the surfactant blended in the hair detergent is to impart smoothness during rinsing, a dry feeling after drying, and no stiffness after drying, but the most important of these is smoothness during rinsing. This is because, while the feeling after drying can be improved by treating with a rinse, conditioner, or a leave-in type out-bath treatment after treatment with a detergent, smoothness during rinsing cannot be compensated for by other methods. In addition, mildness is an essential performance of a hair detergent composition, and is important because it is difficult to completely improve it even if other ingredients are blended. Therefore, it is most preferable for the surfactant blended in the hair detergent to be one that is excellent in mildness and smoothness during rinsing.

[0061] The role of surfactants incorporated in body cleansers such as body soaps is to have low irritation while having cleaning power, not remove excess oil from the body, not leave a tight feeling after drying, and provide moderate moisturizing properties, but the most important role is not to remove excess oil from the body. This is because leaving a moderate amount of oil on the body suppresses the tight feeling after drying after treatment with the cleansing agent and the evaporation of excess moisture from the body. More preferably, the conditioning component covers the body surface during body washing, further suppressing the tight feeling after drying and the evaporation of excess moisture from the body. Therefore, it is desirable for the surfactants incorporated in body cleansing compositions to be those that wash the body mildly and also provide excellent smoothness during rinsing by covering the body surface with the conditioning component during body washing.

[0062] The solid detergent composition of the present invention can also be used as a facial cleanser by using a surfactant with very low skin irritation, for example, a carboxylic acid such as sodium lauroyl sarcosine, and can provide a smooth washing sensation, no tight feeling after washing the face, and a moist feeling after drying.

[0063] In addition, from the viewpoint of good foam quality that is smooth and spreads easily on the skin and soft and moisturized good feeling of use on hair and skin after washing, it is preferable that component (B) contains one or more selected from N-coconut oil fatty acid acyl-L-alanine, N-coconut oil fatty acid acyl-L-glutamic acid, and their salts. The total content of N-coconut oil fatty acid acyl-L-alanine, N-coconut oil fatty acid acyl-L-glutamic acid, and their salts in component (B) is preferably 60% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 99% by mass or more, and particularly preferably substantially 100% by mass. Furthermore, it is most preferable that component (B) contains substantially 100% by mass of N-coconut oil fatty acid acyl-L-alanine and their salts.

[0064] [water] Water may be used in the solid detergent composition of the present invention. The type of water is not particularly limited, and any of distilled water, pure water, ultrapure water, tap water, and the like can be used.

[0065] [Other ingredients] The solid detergent composition of the present invention may contain other components in addition to (A) the cationic polymer, (B) the anionic surfactant, and water. Examples of other components include (A) cationic polymers or (B) anionic surfactants that do not satisfy requirements I or II, water-soluble polymers other than (A) cationic polymers, surfactants other than (B) anionic surfactants, and oils. Other components that may be contained in the solid detergent composition of the present invention will be listed below, but the present invention is not limited to these in any way.

[0066] <Water-soluble polymer> Examples of the water-soluble polymer include a cationic polymer, an anionic polymer, a nonionic polymer, and an amphoteric polymer.

[0067] Cationic polymers include cationic modified cellulose ether derivatives, cationic starch, cationic guar gum derivatives, homopolymers of diallyl quaternary ammonium salts, quaternized polyvinylpyrrolidone derivatives, polyglycol polyamine condensates, vinylimidazolium trichloride / vinylpyrrolidone copolymers, hydroxyethylcellulose / dimethyldiallylammonium chloride copolymers, polydimethyldiallylammonium halides, dimethyldiallylammonium hydride / acrylic acid copolymers, dimethyldiallylammonium hydride / acrylic acid / acrylamide copolymers, vinylpyrrolidone / quaternized dimethylaminoethyl methacrylate copolymers, polyvinylpyrrolidone / alkylaminoacrylate copolymers, polyvinylpyrrolidone / alkylaminoacrylate / vinyl Examples of cationic polymers include dicaprolactam copolymers, vinylpyrrolidone / methacrylamidopropyl trimethylammonium chloride copolymers, alkylacrylamide / acrylate / alkylaminoalkylacrylamide / polyethylene glycol netaacrylate copolymers, adipic acid / dimethylaminohydroxypropylethylenetriamine copolymers, dimethyldiallylammonium halide polymers, dimethyldiallylammonium halide / acrylamide copolymers, propyltrimonium chloride acrylamide / dimethylacrylamide copolymers, propyltrimonium chloride acrylamide / ethyltrimonium chloride methacrylate / dimethylacrylamide copolymers, and ethyltrimonium chloride methacrylate / hydroxyethylacrylamide copolymers.

[0068] Examples of the anionic polymer include acrylic acid derivatives such as polyacrylic acid and its salts, acrylic acid-acrylamide-ethyl acrylate copolymers and its salts, methacrylic acid derivatives, and crotonic acid derivatives.

[0069] Examples of nonionic polymers include acrylic acid derivatives such as hydroxyethyl acrylate-methoxyethyl acrylate copolymers and polyacrylamide, vinylpyrrolidone derivatives such as polyvinylpyrrolidone, vinylpyrrolidone, vinyl acetate copolymers, methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose.

[0070] Examples of the amphoteric polymer include dimethyldiallylammonium chloride derivatives such as an acrylamide-acrylic acid-dimethyldiallylammonium chloride copolymer and an acrylic acid-dimethyldiallylammonium chloride copolymer.

[0071] These water-soluble polymers may be used alone or in combination of two or more.

[0072] <Surfactant> Examples of the surfactant include anionic surfactants, amphoteric surfactants, nonionic surfactants, cationic surfactants, and semi-polar surfactants that do not satisfy requirements I and II.

[0073] Examples of anionic surfactants that do not satisfy requirements I and II include the above-mentioned (B) anionic surfactants that do not satisfy requirements I and II in combination with the (A) cationic polymer, and the following other anionic surfactants. Note that even if a surfactant falls under the following other anionic surfactants, it can be used as the above-mentioned (B) anionic surfactant as long as it satisfies requirements I and II.

[0074] Other anionic surfactants include, for example, alkyl ether sulfates, alkyl sulfates, olefin sulfonates, alkyl sulfonates, alkyl ether sulfates, alkenyl ether sulfates, alkenyl sulfates, paraffin sulfonates, alkyl amide sulfonates, alkenyl amide sulfonates, alkyl sulfoacetates, alkenyl sulfoacetates, alkyl glyceryl ether sulfonates, polyoxyalkylene aliphatic amide ether sulfates, monoglyceride sulfates, alkyl glyceryl ether sulfates, N-alkyl amide alkanol sulfates, acyl isethionates, acyl glutamates, acyl lactylates, acylated taurates, alkyl ether carboxylates, acylalanines, and higher fatty acid salts. Among these, for example, alkyl ether sulfates, alkyl ether carboxylates, and higher fatty acid salts are preferred from the viewpoint of detergency (detergency, foaming ability, and foam quality), and acylated taurates, acylalanine salts, acylsarcosine salts, and acyl glutamates are preferred from the viewpoint of conditioning properties (low irritation, smooth rinsing).

[0075] When the surfactant is a salt, the counter ion that forms the salt is not particularly limited, and examples thereof include alkali metal ions such as sodium and potassium; alkaline earth metal ions such as calcium and magnesium; ammonium ion; and alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, and triisopropanolamine.

[0076] These anionic surfactants may be used alone or in combination of two or more kinds.

[0077] Examples of amphoteric surfactants include amide amino acid type surfactants, amide betaine type amphoteric surfactants, amide sulfobetaine type amphoteric surfactants, betaine type amphoteric surfactants, sulfobetaine type amphoteric surfactants, phosphobetaine type amphoteric surfactants, carbobetaine type amphoteric surfactants, amino acid type amphoteric surfactants, phosphate ester type amphoteric surfactants, imidazolinium type amphoteric surfactants, etc. Among these, alkylamidopropyl betaines having 12 to 14 carbon atoms are preferably used from the viewpoints of foaming and cleaning properties.

[0078] Examples of nonionic surfactants include polyoxyalkylene ethers, polyoxyalkylene alkyl ethers or polyoxyalkylene alkenyl ethers, polyoxyethylene hydrogenated castor oil, polyoxyalkylene polyoxyalkylene alkyl ethers, sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene sorbit fatty acid esters, fatty acid glycerin esters, fatty acid glycol esters, alkylene glycol fatty acid esters, polyalkylene glycol fatty acid esters, polyglycerin fatty acid esters, polyoxyalkylene glycerin fatty acid esters, alkyl sucrose Examples of such surfactants include kalide-based surfactants, fatty acid monoethanolamides or diethanolamides or ethoxylates thereof, ethoxylates of monoglycerides, fatty acid sucrose esters, polyoxyalkylene lanolin or lanolin alcohol or beeswax derivatives, polyoxyethylene sterol or hydrogenated sterol, polyoxyalkylene alkyl ether phosphoric acid or phosphate salts, polyoxyalkylene alkyl allyl ethers, polyoxyalkylene glyceryl mono fatty acid esters, polyoxyalkylene fatty acid esters, polyoxyalkylene fatty acid amides, polyoxyalkylene alkyl amides, and polyalkylene imine derivatives.

[0079] Examples of the cationic surfactant include alkyltrimethylammonium salts, alkoxytrimethylammonium salts, dialkyldimethylammonium salts, alkyldimethylamines or salts thereof, alkoxydimethylamines or salts thereof, and alkylamidomethylamines and salts thereof.

[0080] Examples of the semi-polar surfactant include tertiary amine oxide type semi-polar surfactants such as alkylamine oxides and alkylamidoamine oxides. Among them, lauryl dimethylamine oxide is preferably used from the viewpoints of foaming and its ability to act as a viscosity adjuster.

[0081] These surfactants may be used alone or in combination of two or more.

[0082] <Oil content> Examples of oils include higher alcohols such as lauryl alcohol, myristyl alcohol, cetyl alcohol, oleyl alcohol, stearyl alcohol, isostearyl alcohol, behenyl alcohol, 2-octyldodecanol, and cetostearyl alcohol; silicone oils such as dimethylpolysiloxane, amino-modified silicone, polyether-modified silicone, methylphenylpolysiloxane, fatty acid-modified silicone, alcohol-modified silicone, alkoxy-modified silicone, epoxy-modified silicone, fluorine-modified silicone, cyclic silicone, and alkyl-modified silicone; fluorine oils such as perfluoropolyether; hydrocarbons such as squalane, squalene, liquid paraffin, liquid isoparaffin, and cycloparaffin; polyhydric alcohol fatty acid esters, fatty acid esters, and fatty acids. Examples of the fatty acid include ester oils such as alkyl esters, polybasic acid esters, and alkyl glyceryl ethers and their fatty acid esters; higher fatty acids such as capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, coconut oil fatty acid, isostearic acid, and isopalmitic acid; glycerides such as olive oil; waxes such as jojoba oil, beeswax, lanolin, and carnauba wax; esters such as isopropyl palmitate, isopropyl myristate, octyldodecyl myristate, hexyl laurate, cetyl lactate, propylene glycol monostearate, oleyl oleate, hexadecyl 2-ethylhexanoate, isononyl isononanoate, and tridodecyl isononanoate; isostearyl glyceryl ether; and polyoxypropylene butyl ether.

[0083] Among these, when higher alcohols are blended, a cleansing composition having an appropriate viscosity and generating fine foam can be obtained. The higher alcohol is preferably one having 12 to 18 carbon atoms, and among these, cetanol is preferable. In addition, the inclusion of silicone oil improves the dry feeling after drying.

[0084] These oils may be used alone or in combination of two or more.

[0085] <Other ingredients> Other ingredients besides those mentioned above include solubilizers such as ethanol, ethylene glycol, and propylene glycol; moisturizers such as glycerin, sorbitol, maltitol, dipropylene glycol, 1,3-butylene glycol, and hyaluronic acid; foam enhancers; natural extracts of animals and plants and their derivatives; proteins and their hydrolysates obtained from shells, pearls, silk, and the like; organic acids such as citric acid and lactic acid; inorganic acids such as phosphoric acid, hydrochloric acid, and sulfuric acid; pH adjusters such as citric acid and sodium hydroxide; inorganic salts such as sodium chloride, sodium sulfate, ammonium chloride, and sodium citrate; thickeners, fragrances, preservatives, chelating agents, ultraviolet absorbers, antioxidants, higher fatty acids, antidandruff agents, vitamins, bactericides, anti-inflammatory agents, colorants such as dyes and pigments; suspending agents such as polystyrene emulsions; and functional capsules and beads, which can be appropriately blended within a range that does not impair the effects of the present invention.

[0086] [Composition] There is no particular restriction on the composition of the solid detergent composition of the present invention, including the cationic polymer (A) and the anionic surfactant (B) and other components, but in order to maintain the solid state, the water content in the solid detergent composition is preferably 30% by weight or less, particularly 15% by weight or less, and especially 10% by weight or less. When used as a solid detergent having a certain size or more, rather than in powder or granule form, it is important that cracks or breaks do not occur under dry conditions, and if this is not an issue, a lower water content is preferable. However, the incorporation of water or polyol is effective in preventing cracks or breaks.

[0087] The content of the cationic polymer (A) in the solid detergent composition of the present invention is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, even more preferably 0.5% by weight or more, and particularly preferably 1% by weight or more, from the viewpoint of generating a necessary amount of coacervate to contribute to rinsing performance. On the other hand, from the viewpoint of suppressing deterioration of finish (e.g., stickiness) due to excessive adsorption of coacervate, the content of the cationic polymer (A) is preferably 10% by weight or less, particularly preferably 5% by weight or less.

[0088] The content of the anionic surfactant (B) in the solid detergent composition of the present invention is preferably 0.1% by weight or more, more preferably 1% by weight or more, and even more preferably 2% by weight or more, from the viewpoint of forming a coacervate with the cationic polymer (A). When used as a solid detergent having a certain size or more, rather than in powder or granule form, it is important that the detergent does not crack or break under dry conditions, but as long as this problem does not occur, there is no upper limit to the content of the anionic surfactant (B).

[0089] In the present invention, in order to effectively obtain the effect of coacervate formation by satisfying requirements I and II, the total content of the (A) cationic polymer and the (B) anionic surfactant in the solid matters other than water in the solid detergent composition of the present invention is preferably 0.2% by weight or more, more preferably 0.5% by weight or more, even more preferably 1% by weight or more, and particularly preferably 2% by weight or more. However, when the solid detergent composition of the present invention contains other components other than the (A) cationic polymer and the (B) anionic surfactant (as described above, the other components also include cationic polymers and anionic surfactants that do not satisfy requirements I and II), the other components can be used in combination without upper limit as long as they do not inhibit the coacervate formation of the (A) cationic polymer and the (B) anionic surfactant. However, since anionic surfactants having strong acid groups, such as sodium lauryl sulfate and sodium laureth sulfate, may inhibit the coacervate formation of the (A) cationic polymer and the (B) anionic surfactant, from the viewpoint of reducing skin irritation, their content is preferably 3% by weight or less, more preferably 2% by weight or less, even more preferably 1% by weight or less, and it is most desirable that they are not contained at all. Therefore, when a component that inhibits the coacervate formation of the cationic polymer (A) and the anionic surfactant (B) is blended into the solid detergent composition of the present invention, the total content of the cationic polymer and the anionic surfactant (B) is preferably high, and is preferably 5 wt % or more, more preferably 10 wt % or more, even more preferably 30 wt % or more, particularly preferably 50 wt % or more, and especially preferably 70 wt % or more.

[0090] From the viewpoint of coacervate forming ability, the content ratio of the (A) cationic polymer to the (B) anionic surfactant in the solid detergent composition of the present invention is preferably, by weight, (A) cationic polymer:(B) anionic surfactant=1:0.5-300, particularly 1:1-100, and especially 1:1-50.

[0091] [Solid detergent composition and method for producing the solid detergent] The solid detergent composition of the present invention can be produced by mixing (A) the cationic polymer and (B) the anionic surfactant with water and other components used as necessary under heating at about 60° C. to uniformly disperse all the components. The mixture thus obtained can be filled into a container and cooled to room temperature to solidify, thereby making a solid detergent.

[0092] [Uses of solid detergents] The solid detergent using the solid detergent composition of the present invention can be used as a solid face wash, solid body soap, solid hand soap, solid shampoo, etc. EXAMPLES

[0093] The present invention will be described more specifically below with reference to examples.

[0094] [Raw materials used] The specifications of the cationic polymer, anionic surfactant and other components used in the preparation of the concentrate and solid detergent composition are shown in Table 1 below.

[0095] [Table 1]

[0096] [Examples 1-2, Comparative Examples 1-4] The components shown in Table 2 were mixed in the ratios shown in Table 2 to prepare stock solutions, and the transmittance was measured by the following method. In addition, the transmittance of a 5-fold diluted solution of each of the original solutions was measured by the following method to evaluate the coacervate forming ability. The results are shown in Table 2 together with the state of the prepared stock solution.

[0097] <Transmittance measurement method> The sample liquid was poured into a spectrophotometer cell while taking care not to mix in bubbles, and the transmittance (%, optical path length 1 cm, 25°C) at a wavelength of 655 nm was measured using a spectrophotometer V-530 (JASCO Corp.). Prior to the measurement, distilled water was poured into the spectrophotometer cell, and the measured value was set to 100%.

[0098] <Measurement of original solution transmittance (%)> The transmittance of each stock solution was measured by the above method, and the value was rounded off to the first decimal place to obtain the "stock solution transmittance (%)."

[0099] <Measurement of transmittance (%) of 5-fold diluted solution> 2 g of each stock solution and 8 g of water were weighed into a 10 cc sample bottle and stirred for 1 minute. The transmittance of the liquid immediately after stirring was measured using the method described above, and the value was rounded off to the first decimal place to obtain the "5x diluted solution transmittance (%)."

[0100] <Evaluation of coacervate formation ability> The transmittance (%) of the 5-fold diluted solution was evaluated according to the following criteria. ◎: The transmittance (%) of the 5-fold diluted solution is 50% or less, and the coacervate formation ability is very high ○: The transmittance (%) of the 5-fold diluted solution is 90% or less, and the substance has the ability to form coacervate. ×: The transmittance (%) of the 5-fold diluted solution exceeds 90%, and there is no ability to form coacervate.

[0101] [Table 2]

[0102] [Examples 3-4, Comparative Examples 5-6] The components shown in Table 3 were mixed in the ratios shown in Table 3 to prepare solid detergent compositions. The hair and body cleansing properties of the obtained solid detergent compositions were evaluated by the following methods. The results are shown in Table 3.

[0103] <Hair cleansing properties> The hair was washed using the actual head, and the feel during washing, the feel during rinsing, and the moist feel after washing were evaluated according to the following criteria.

[0104] (Feel when cleaning) : Moderately slippery and has a very good massage sensation. ◯: Slimy feeling and good massage sensation. △: It doesn't feel slimy, but there is no squeaking. ×: The creaking is strong and unpleasant.

[0105] (Feel when rinsing) ◎: Very smooth and easy to run your fingers through. ○: Not smooth, but feels good to the touch. △: The smoothness of the hair is not sustained and fingers get caught. ×: Fingers cannot pass through at all from the early stage of rinsing.

[0106] (Moisturizing feeling after washing) ◎: Smooth and well-formed. ○: Not smooth enough, but has some cohesion. ×: Dry and unmanageable.

[0107] <Body cleansing properties> The subject actually washed their body and evaluated the feel during washing, the feel during rinsing, and the moist feeling after washing according to the following criteria. (Feel when cleaning) : Moderately slippery and has a very good massage sensation. ◯: Slimy feeling and good massage sensation. △: No slimy feeling, but no squeaking. ×: The creaking is strong and unpleasant. (Feel when rinsing) ◎: Very smooth and no squeaking. ○: It does not feel smooth, but there is no squeaking. △: There is a creaking sound. ×: Feels sticky. (Moisturizing feeling after washing) ◎: Moist. ○: Not moisturizing, but not tight. ×: Feels tight.

[0108] [Table 3]

[0109] As is clear from Table 3, the combination of the cationic polymer (A) and the anionic surfactant (B) used in Examples 3 and 4 satisfies requirements I and II as shown in Example 1, and the formation of a coacervate by the cationic polymer (A) and the anionic surfactant (B) provides excellent cleaning and conditioning effects. In Example 4, the feel of the hair during washing and rinsing was rated as "Excellent." Sodium cocoyl isethionate has low solubility in water and exists in particulate form in water, so when washing hair, it gets between the hair and fingers and acts as a lubricant, giving a good feel, but on the other hand, sodium cocoyl isethionate is relatively hydrophobic and does not adsorb to hair, so the feel during rinsing is not very good. This is thought to be the reason why Comparative Example 5 gives a good feel during hair washing but a poor feel during rinsing. Furthermore, Example 3, which does not contain sodium cocoyl isethionate, has a slightly inferior feel when washing hair compared to Example 4, but the feel when rinsing is good. Example 4 is within the scope of the present invention and is believed to have the effect of containing sodium cocoyl isethionate, so the feel when washing the hair is quite good. In contrast, Comparative Examples 5 and 6 are inferior in cleaning effect and conditioning effect. The combination of (A) cationic polymer and (B) anionic surfactant used in Comparative Example 5 was cloudy in the undiluted state and had no coacervate-forming ability. In addition, the combination of (A) cationic polymer and (B) anionic surfactant used in Comparative Example 6 did not satisfy Requirement II as shown in Comparative Example 1, and had no coacervate-forming ability. For this reason, Comparative Examples 5 and 6 did not provide good cleaning and conditioning effects.

Claims

1. A solid detergent composition comprising (A) a cationic polymer and (B) an anionic surfactant, wherein (A) the cationic polymer and (B) the anionic surfactant satisfy the following requirements I and II: Requirement I: The transmittance of light with a wavelength of 655 nm (optical path length 1 cm, 25° C.) of 95% or more for a mixed liquid (hereinafter referred to as “mixed liquid 1”) obtained by mixing (A) a cationic polymer, (B) an anionic surfactant, and water in a weight ratio of 0.5:12:87.5 is 95% or more for light with a wavelength of 655 nm (optical path length 1 cm, 25° C.). Requirement II: The transmittance of light with a wavelength of 655 nm (optical path length 1 cm, 25°C) of the diluted solution obtained by mixing Mixture 1 and water in a weight ratio of 1:4 is 90% or less.

2. 2. The solid detergent composition according to claim 1, wherein the cationic polymer (A) is a copolymer containing a structural unit corresponding to the cationic vinyl monomer (a1) and a structural unit corresponding to the vinyl monomer (a2) represented by the following general formula (1) or (2): CH ２ =C(R １ )-CO-NR ２ R ３ (1) (In the formula, R １ represents a hydrogen atom or a methyl group, R ２ and R ３ each independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; R ２ and R ３ The sum of the carbon numbers is 1 or more and 4 or less.) CH ２ =C(R ４ )-CO-NR ５ -(CH ２ ) ａ -OH (2) (In the formula, R ４ represents a hydrogen atom or a methyl group, R ５ represents a hydrogen atom, or an alkyl or hydroxyalkyl group having 1 to 4 carbon atoms, and a represents an integer of 1 to 4.

3. 3. The solid detergent composition according to claim 1, wherein the anionic surfactant (B) is a compound represented by the following general formula (4) and / or a salt thereof: R-A-X (4) (In the formula, R represents a linear or branched alkyl group, alkenyl group, or alkylphenyl group having 8 to 24 carbon atoms, A represents an oxyalkylene group or a divalent linking group containing an amide bond, and X represents a carboxyl group or a phosphate group.)

4. The solid detergent composition according to any one of claims 1 to 3, wherein the anionic surfactant (B) is an amino acid-based anionic surfactant.

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