JP2007154389A - Method for producing sanitary thin paper and sanitary thin paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide sanitary thin paper easily producible, low in cost and improved in smoothness. <P>SOLUTION: The method for producing sanitary thin paper comprises coating a solution containing a predetermined amidoamine compound at a rate of 0.005-50 wt.% effective component except water on 10-35 g/m<SP>2</SP>of basis weight paper, and the sanitary thin paper is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to sanitary thin paper such as tissue paper and toilet paper. In particular, it relates to sanitary thin paper with smooth surface properties.

Hygiene thin paper such as tissue paper and toilet paper is often used for wiping the skin, sniffing the nose, etc., and since it will rub against the skin during such use, a high surface smoothness is required. The
Therefore, conventionally, in order to increase the smoothness of sanitary thin paper, oily substances such as liquid paraffin and surfactants are coated on the front and back surfaces of the thin paper, or are internally added to raw pulp.
JP 07-216786 A JP 05-049551 A JP-A-2001-262489

However, manufacturers are demanding a production method that is easier to produce than liquid paraffin and surfactants, and consumers are demanded to further improve the smoothness of sanitary thin paper.
In addition, in addition to chemicals spreading throughout the raw material pulp, it is difficult to selectively modify the paper surface. Troubles such as paper breakage easily occur due to the instability of creping (applying crepe-like wrinkles to paper). Therefore, a manufacturing method by external addition has been demanded.
Therefore, a main object of the present invention is to provide a sanitary thin paper that is easy to manufacture and low in cost, and has improved smoothness.

式（２）においては、ｎは、０〜２であり、Ｒ２は、炭素数１〜４のアルキレン基であり、Ｒ３，Ｒ４，Ｒ５、Ｒ６は、水素原子、炭素数１〜４のヒドロキシアルキル基、炭素数１〜３のアルキル基であり、かつ、Ｒ３，Ｒ４，Ｒ５、Ｒ６の少なくとも一つは、炭素数１〜４のヒドロキシアルキル基である。ただし、ｎ＝０のときは、Ｒ３、Ｒ４、Ｒ５、Ｒ６の少なくとも一つは水素原子またはヒドロキシアルキル基である。 The present invention that has solved the above-described problems and the effects thereof are as follows.
<Invention of Claim 1>
A solution containing a condensate obtained by reacting a compound represented by the formula (1) and a compound represented by the formula (2) or an amidoamine compound consisting of a salt thereof with respect to a thin paper having a basis weight of 10 to 35 g / m ² A sanitary thin paper manufacturing method, wherein 0.005 to 50% by weight of an active ingredient excluding moisture is externally added.
Formula (1) ... R1COOH
In the formula (1), R1CO represents an acyl group having 10 to 24 carbon atoms.

In the formula (2), n is 0 to 2, R2 is an alkylene group having 1 to 4 carbon atoms, R3, R4, R5, and R6 are a hydrogen atom and a hydroxyalkyl having 1 to 4 carbon atoms. Group, an alkyl group having 1 to 3 carbon atoms, and at least one of R3, R4, R5, and R6 is a hydroxyalkyl group having 1 to 4 carbon atoms. However, when n = 0, at least one of R3, R4, R5, and R6 is a hydrogen atom or a hydroxyalkyl group.

(Function and effect)
The amidoamine compound according to the first aspect of the present invention is excellent in handleability as compared with liquid paraffin and surfactant. Moreover, the surface smoothness is remarkably improved only by externally adding to the base paper after paper making. Therefore, the sanitary thin paper with which the manufacture becomes easy and the smoothness of the surface is remarkably improved is provided.

式（４）においては、ｎは、１〜３であり、Ｒ８は、炭素数１〜４のアルキレン基であり、Ｒ９，Ｒ１０は、水素原子または炭素数１〜３のアルキル基である。 <Invention of Claim 2>
A solution containing a condensate obtained by reacting a compound represented by the formula (3) and a compound represented by the formula (4) or an amidoamine compound comprising a salt thereof with respect to a thin paper having a basis weight of 10 to 35 g / m ² A sanitary thin paper manufacturing method, wherein 0.005 to 50% by weight of an active ingredient excluding moisture is externally added.
Formula (3) ... R7COOH
In the formula (3), R7CO represents an acyl group having 10 to 24 carbon atoms.

In Formula (4), n is 1-3, R8 is a C1-C4 alkylene group, R9, R10 is a hydrogen atom or a C1-C3 alkyl group.

(Function and effect)
The amidoamine compound according to the second aspect of the present invention is excellent in handleability as compared with liquid paraffin and surfactant. Moreover, the surface smoothness is remarkably improved only by externally adding to the base paper after paper making. Therefore, the sanitary thin paper with which the manufacture becomes easy and the smoothness of the surface is remarkably improved is provided.

<Invention of Claim 3>
The method for producing sanitary thin paper according to claim 1 or 2, wherein at least one of a humectant, a softening agent and a filler is added to the solution prior to external addition to the thin paper.

(Function and effect)
Prior to the external addition to the thin paper, a moisturizing agent, a softening agent, and a filler are added to the solution to improve the moisturizing property, improve the flexibility, improve the opacity, and further improve the surface smoothness.

<Invention of Claim 4>
A sanitary thin paper obtained by the method according to any one of claims 1 to 3.

(Function and effect)
A low-cost sanitary thin paper that is easy to manufacture and has a significantly improved surface smoothness is provided.

  According to the present invention, it is possible to provide a sanitary thin paper that is easy to manufacture, inexpensive, and further improved in smoothness.

Next, embodiments of the present invention will be described in detail below with reference to the drawings.
The sanitary thin paper according to the present embodiment is used, for example, in a carton box in which a thin paper group in which a plurality of sheets are folded in an inter-hold state with 1 ply and 2 ply is formed in a so-called upper surface and a take-out port is formed. Sometimes, when the uppermost sanitary thin paper is taken out from the take-out port on the upper surface of the carton box, a so-called pop-up type product form in which the next sanitary thin paper is drawn out can be taken.
The sanitary thin paper of this embodiment is externally added with a solution containing a predetermined amidoamine compound. Hereinafter, the first embodiment and the second embodiment will be described in detail according to the difference in the solution for external addition.

(First embodiment: corresponding to the invention of claim 1)
A first embodiment will be described. The sanitary thin paper of the first form is a solution for external addition comprising an amidoamine compound comprising a condensate obtained by reacting a compound represented by the formula (1) and a compound represented by the formula (2) or a salt thereof. Is a sanitary thin paper that is externally added to a thin paper having a basis weight of 10 to 35 g / m ² .
Formula (1) ... R1COOH

  As the thin paper to which the solution is applied, known thin paper that is used particularly for skin wiping such as tissue paper or toilet paper can be used. The raw material of the base paper is not particularly limited, and an appropriate raw material can be used. When using pulp fiber as a raw material, examples of the pulp fiber (raw pulp) include wood pulp, non-wood pulp, synthetic pulp, waste paper pulp, and more specifically, groundwood pulp (GP), stone Mechanical pulp (MP) such as ground pulp (SGP), refiner ground pulp (RGP), pressurized groundwood pulp (PGW), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), bleach chemithermomechanical pulp (BCTMP) ), Chemical mechanical pulp (CGP), semi-chemical pulp (SCP), hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP) and other kraft pulp (KP), soda pulp (AP), sulfite pulp (SP), chemical pulp (CP) such as dissolving pulp (DP) , Synthetic pulp made from nylon, rayon, polyester, polyvinyl alcohol (PVA), deinked pulp (DIP), waste paper pulp such as waist pulp (WP), ground pulp (TP), cotton, flax, hemp, jute , One or several kinds of rag pulp, straw pulp, esparto pulp, bagasse pulp, bamboo pulp, kenaf pulp and other auxiliary pulps such as bast pulp, etc. Can be used.

  Raw materials such as pulp fibers are used as a base paper through, for example, a known papermaking process, specifically, a wire part, a press part, a dryer part, a size press, a calendar part, and the like. In this papermaking, for example, suitable chemicals such as a dispersant, caustic soda, aqueous ammonia and other pH adjusters, antifoaming agents, preservatives, fluorescent dyes, mold release agents, water resistance agents, flow modifiers, yield improvers, etc. Can be added.

The basis weight of the base paper is preferably 10 to 35 g / m ² in the method for measuring the basis weight of JIS P 8124. This is because if it is less than 10 g / m ² , it is difficult to ensure adequate strength from the viewpoint of improving softness when touching the skin, and if it exceeds 35 g / m ² , it becomes too hard and the skin feels soft. Because it will be bad.

  On the other hand, the compound represented by the formula (1) according to the present embodiment is a saturated or unsaturated carboxylic acid having 10 to 24 carbon atoms, specifically, capric acid, lauric acid, myristic acid, palmitic acid, palmitolein. Acid, stearic acid, oleic acid, linoleic acid, linolenic acid, arachidic acid, behenic acid, erucic acid, lignoceric acid, etc., or a mixture of two or more, coconut oil fatty acid, palm oil fatty acid, beef tallow fatty acid, lard Examples thereof include mixed fatty acids such as fatty acid, soybean oil fatty acid, rapeseed oil fatty acid and tall oil fatty acid. Preferably, it is a saturated or unsaturated fatty acid having 12 to 22 carbon atoms, more preferably a saturated or unsaturated fatty acid having 14 to 18 carbon atoms. When the carbon number is smaller than 10, the effect of improving the bulkiness is weakened, and when the carbon number is larger than 24, the handling of the external additive solution becomes difficult, which is not preferable.

  On the other hand, in the compound represented by the formula (2) according to this embodiment, n is 0 to 2, R2 is an alkylene group having 1 to 4 carbon atoms, and R3, R4, R5, and R6 are A hydrogen atom, a hydroxyalkyl group having 1 to 4 carbon atoms, an alkyl group having 1 to 3 carbon atoms, and at least one of R3, R4, R5, and R6 is a hydroxyalkyl group having 1 to 4 carbon atoms. . However, when n = 0, at least one of R3, R4, R5, and R6 is a hydrogen atom or a hydroxyalkyl group. That is, the compound represented by the formula (2) in this embodiment is a compound having at least one hydroxyalkyl group and two or more amino groups in the molecule.

  Specific examples of the alkylene group having 1 to 4 carbon atoms include a methylene group, an ethylene group, a propylene group, and a butylene group, and an ethylene group is preferable. Specific examples of the hydroxyalkyl group having 1 to 4 carbon atoms include a hydroxymethyl group, a hydroxyethyl group, a hydroxypropyl group, and a hydroxybutyl group. Specific examples of the alkyl group having 1 to 3 carbon atoms include a methyl group, an ethyl group, and a propyl group.

  A condensate of the compound represented by formula (1) and the compound represented by formula (2), which is an amidoamine compound according to this embodiment, can be obtained, for example, as follows. Under a nitrogen gas atmosphere, a compound represented by the formula (1) and a compound represented by the formula (2) are charged into a reactor, heated while stirring, and reacted for several hours while removing generated water, The desired condensate is obtained. In that case, the amount of the compound represented by the formula (1) to be used is preferably 0.8 to 4 times, more preferably 0.9 to 2 times the amount of the compound represented by the formula (2). Is a mole.

  The condensate obtained by reacting the compound represented by the formula (1) and the compound represented by the formula (2) can be used as it is by mixing it with the external additive solution. It can be used after reacting as a salt. Handling with salt becomes easier. Examples of the inorganic acid used in this case include hydrochloric acid, sulfuric acid, carbonic acid, nitric acid, phosphoric acid and the like. Examples of organic acids include formic acid, acetic acid, propionic acid, octylic acid, butyric acid, oxalic acid, malonic acid, itaconic acid, adipic acid, succinic acid, sebacic acid, citric acid, hydroxybenzoic acid, malic acid, hydroxymalonic acid Lactic acid, salicylic acid, hydroxyvaleric acid, aspartic acid, glutamic acid, taurine, sulfamic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid and the like. Among these, organic acids are preferable, and formic acid, acetic acid, and propionic acid are particularly preferable. When used as a salt, the total amine value of the condensate is measured, and an organic acid or an inorganic acid equivalent to the total amine value is added to obtain a salt of the condensate.

  As described above, the external additive solution according to the present embodiment is externally added in an amount of 0.005 to 50% by weight, preferably 0.05 to 10% by weight, of the active ingredient excluding moisture with respect to the thin paper. It is desirable. If it is less than 0.005% by weight, the effect of improving the smoothness will not be exhibited, and even if it is used in excess of 50% by weight, not only will sticky operation easily occur, but the cost will increase, which is desirable. Absent.

  On the other hand, it is desirable to add a humectant to the external additive solution according to this embodiment. Moisturizers include propylene glycol, polyethylene glycol, glycine, glycerin, diglycerin, polyglycerin, sorbit, 1,3-butylene glycol, echylene glycol, diethylene glycol, fructose, glucose, oligosaccharide, oligosaccharide alcohol, maltitol , Trehalose, reduced starch hydrolyzate, glycine betaine, pyrrolidone carboxylic acid, pyrrolidone carboxylate, sodium lactate and the like. Of these, propylene glycol and polyethylene glycol are particularly preferred because of their excellent handleability and low cost.

  On the other hand, it is desirable to include a softening agent in the external additive solution according to this embodiment. As the softening agent, an appropriate amount of the softening agent used in this type of conventionally known sanitary thin paper such as tissue paper and toilet paper can be used. Among these, preferred specific examples include quaternary ammonium salts and phosphate esters.

  On the other hand, a filler can be added to the external additive solution according to this embodiment. As the filler, a powdery component that improves surface slip and smoothes the skin is preferable, for example, silicon powder, talc, kaolin, clay, calcium carbonate, titanium oxide, calcium stearate, zinc stearate, lithium stearate, Examples include processed starch, corn starch, wheat flour, potato starch, rice starch, and wheat flour protein. Among these, silicon powder and talc are particularly suitable because they make the touch feeling particularly smooth.

  The moisturizing agent, softening agent, and filler listed above may be mixed or dissolved in the solution for external addition prior to external addition to the thin paper, and the order of addition is not particularly limited. Moreover, the usage-amounts of a moisturizing agent, a softening agent, and a filler are suitably changed according to a conventionally known usage-amount, usage, the basic weight of a thin paper, etc. according to the chemical | medical agent type to be used.

  As an external addition form of the solution to the thin paper, for example, the solution for external addition may be printed, applied, and sprayed on the thin paper (base paper) after paper making. However, since the basis weight of the thin paper is low, spraying and printing with a printing machine are more suitable than application with a known coating machine such as a coater. Gravure printing or flexographic printing using a gravure roll or flexo roll It is particularly preferred to form the skin transfer by printing on a base paper.

  The external additive solution is preferably applied to the thin paper so that the amount of the active ingredient excluding moisture is 0.005 to 50% by weight with respect to the weight of the thin paper as the base paper. In the case of gravure printing, by changing the groove depth and number of lines of gravure roll, in the case of flexographic printing, by changing the groove depth and number of lines of the anilox roll and the shape of the printing pattern, The coating amount can be changed by changing the concentration of the solution. In order to avoid problems such as coating unevenness and web adhesion to the coating roll, the viscosity of the skin transfer solution applied is 40 ° C., 200 mPa.s. S (200 cps) or less is desirable.

  In this embodiment, it is also possible to use a paper strength enhancer such as polyacrylamide and plant guam, and a sizing agent such as alkyl ketene dimer and rosin, which are generally used as external additives in the paper making process. In this case, it may be mixed with the solution for external addition, or may be separately applied and applied to the thin paper.

(Second embodiment: corresponding to the invention of claim 2)
Next, a second embodiment will be described. In the second embodiment, the difference from the first embodiment is only the configuration of the amidoamine compound contained in the solution for external addition, the configuration of the thin paper serving as the base paper, the moisturizing agent, Since the external form of the softener, filler, and solution is the same as that of the first embodiment, the description thereof is omitted here.

The sanitary thin paper according to the second aspect comprises a solution containing a condensate obtained by reacting a compound represented by the formula (3) and a compound represented by the formula (4) or an amidoamine compound comprising a salt thereof. This sanitary thin paper is externally added in an amount of 0.005 to 50% by weight of an active ingredient excluding moisture to a thin paper having an amount of 10 to 35 g / m ² .
Formula (3) ... R7COOH

  In the formula (3), R7CO represents an acyl group having 10 to 24 carbon atoms. That is, the compound represented by the formula (3) in this embodiment is a carboxylic acid having 10 to 24 carbon atoms, specifically, capric acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid. , Linoleic acid, linolenic acid, arachidic acid, behenic acid, erucic acid, lignoceric acid, etc. Fatty acids, tall oil fatty acids, olive oil fatty acids, cacao oil fatty acids, sesame oil fatty acids, corn oil fatty acids, sunflower oil fatty acids, mixed fatty acids derived from natural fats such as cottonseed oil fatty acids, and hydrogenated products thereof. Preferably, it is a saturated or unsaturated fatty acid having 12 to 22 carbon atoms, more preferably a saturated or unsaturated fatty acid having 14 to 18 carbon atoms. When the number of carbon atoms is less than 10, the effect of improving bulkiness and oil absorption is weakened, and when the number of carbon atoms is larger than 24, it is difficult to handle the solution for external addition.

  In addition, the compound represented by the formula (3) contains 20 to 100% by weight of an unsaturated carboxylic acid having 16 to 24 carbon atoms, thereby improving the handleability of the solution for external addition and improving the smoothness. Will also improve. As unsaturated carboxylic acids, palmitoleic acid, oleic acid, linoleic acid, linolenic acid, erucic acid and natural mixed fatty acids containing these unsaturated carboxylic acids of 20 to 100% by weight are soybean oil fatty acid, palm oil fatty acid, olive oil fatty acid , Cocoa oil fatty acid, sesame oil fatty acid, corn oil fatty acid, sunflower oil fatty acid, cottonseed oil fatty acid, beef tallow fatty acid, pork tallow fatty acid and the like. More preferred are soybean oil fatty acid, oleic acid, and erucic acid.

  On the other hand, in said Formula (4), n is 1-3, R8 is a C1-C4 alkylene group, R9, R10 is a hydrogen atom or a C1-C3 alkyl group. is there. That is, the compound represented by the formula (4) in the present embodiment is a compound having at least three or more amino groups in the molecule. Examples of the alkylene group having 1 to 4 carbon atoms include a methylene group, an ethylene group, a trimethylene group, a propylene group, a tetramethylene group, and a butylene group, and one or more types can be used. Moreover, as a C1-C3 alkyl group, a methyl group, an ethyl group, a propyl group, etc. are mentioned.

  The compound represented by Formula (3) and the compound represented by Formula (4), which are amidoamine compounds according to this embodiment, can be obtained, for example, as follows. Under a nitrogen gas atmosphere, a compound represented by the formula (3) and a compound represented by the formula (4) are charged into a reactor, heated while stirring, and reacted for several hours while removing generated water, The desired amidated product is obtained. In that case, the amount of the compound represented by the formula (3) to be used is 1.5 to 3.3 moles, preferably 1.8 to 3.1, with respect to the compound represented by the formula (4). Double mole.

  The amidoamine compound obtained by reacting the compound represented by the formula (3) with the compound represented by the formula (4) can be used as it is by mixing it with an external additive solution. It can be used after reacting as a salt. Handling with salt becomes easier. In this case, examples of the inorganic acid used include hydrochloric acid, sulfuric acid, carbonic acid, nitric acid, and phosphoric acid. Organic acids include formic acid, acetic acid, propionic acid, octylic acid, butyric acid, oxalic acid, malonic acid, itaconic acid, adipic acid, succinic acid, sebacic acid, citric acid, hydroxybenzoic acid, malic acid, hydroxymalonic acid Lactic acid, salicylic acid, hydroxyvaleric acid, aspartic acid, glutamic acid, taurine, sulfamic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid and the like. Among these, organic acids are preferable, and formic acid, acetic acid, and propionic acid are particularly preferable. When used as a salt, the total amine value of the amidated product is measured, and an organic acid or inorganic acid equivalent to the total amine value is added to obtain a salt of the amidoamine compound.

Next, examples of the present invention will be described.
It includes an amidoamine compound composed of a salt obtained by reacting a compound represented by the formula (1) and a compound represented by the formula (2) or a condensate obtained by reacting a condensate with an organic acid (formic acid or acetic acid). Sensory evaluation (smoothness, stickiness, comprehensive evaluation) was performed with 50 evaluators by changing the content of the active ingredient excluding moisture in the solution. The conditions and results are shown in Table 1.

  In addition, regarding “smoothness” and “stickiness”, a five-step evaluation was performed, where 5 was given as the best feeling, 5 was sequentially reduced, and 1 was given as the worst feeling. On the other hand, the “comprehensive evaluation” is a three-level evaluation in which ◯ is a good feeling, Δ is a normal feeling, and X is a bad feeling.

  MMD in the table means smoothness represented by the average deviation of the coefficient of friction in the surface characteristics using a KES testing machine. Specifically, this surface characteristics test is performed by “Catotech Co., Ltd.” Friction tester KES SE "can be used. At the time of measurement, a friction element consisting of a piano wire having a cross-sectional diameter of 0.5 mm and a contact area of 10 mm square is brought into contact with a paper sample of the present thin paper cut to 100 mm square with a contact pressure of 10 g. While applying a tension of 20 g / cm to the paper sample in the moving direction, the friction coefficient is measured when the paper sample is moved 2 cm at a speed of 0.1 cm / sec. That is, the average deviation MMD of the friction coefficient is a value obtained by dividing the area of the variation amount of the surface thickness when the friction element is moved by the movement distance (2 cm). Here, this MMD corresponds to smoothness. The smaller the value, the smoother.

  The tensile strength in the table is the dry tensile strength specified in JIS P 8113, measured in two sheets (two plies) of the present thin paper, in the longitudinal direction of 150 cN / 25 mm or more, particularly 280 to 310 cN / 25 mm, It is preferable to use one having a lateral direction of 40 cN / 25 mm or more, particularly 60 to 80 cN / 25 mm. If the dry tensile strength is too low, troubles such as tearing and elongation are likely to occur during production, and if it is too high, the touch becomes stiff during use.

  Furthermore, the softness in the table refers to the bending and softness measured by the handle ohmmeter method (JIS L-1096 E method). Specifically, this surface property test was conducted by Kumagaya Riki Kogyo Co., Ltd. “Handle ohmmeter (digital display type)” manufactured by the company can be used. At the time of measurement, it represents a resistance value (vertical and horizontal average value) when a 10 cm width of one sheet of the present thin paper is pushed into a gap having a width of 5.0 mm, and corresponds to softness. Smaller numbers indicate softer.

  An amidoamine compound comprising a condensate obtained by reacting a compound represented by formula (3) with a compound represented by formula (4) or a salt obtained by reacting a condensate with an organic acid (formic acid or acetic acid) The sensory evaluation (smoothness, stickiness, comprehensive evaluation) with 50 evaluators was performed by changing the content of the active ingredient excluding moisture in the solution containing. The conditions and results are shown in Table 2. Measurement conditions and methods were the same as in Example 1.

  The present invention is applicable to sheet-like materials used for touching the skin such as sanitary thin paper as well as non-woven fabric for wiping.

Claims (4)

A solution containing a condensate obtained by reacting a compound represented by the formula (1) and a compound represented by the formula (2) or an amidoamine compound consisting of a salt thereof with respect to a thin paper having a basis weight of 10 to 35 g / m ² A sanitary thin paper manufacturing method, wherein 0.005 to 50% by weight of an active ingredient excluding moisture is externally added.
Formula (1) ... R1COOH
In the formula (1), R1CO represents an acyl group having 10 to 24 carbon atoms.

In the formula (2), n is 0 to 2, R2 is an alkylene group having 1 to 4 carbon atoms, R3, R4, R5, and R6 are a hydrogen atom and a hydroxyalkyl having 1 to 4 carbon atoms. Group, an alkyl group having 1 to 3 carbon atoms, and at least one of R3, R4, R5, and R6 is a hydroxyalkyl group having 1 to 4 carbon atoms. However, when n = 0, at least one of R3, R4, R5, and R6 is a hydrogen atom or a hydroxyalkyl group. A solution containing a condensate obtained by reacting a compound represented by the formula (3) and a compound represented by the formula (4) or an amidoamine compound comprising a salt thereof with respect to a thin paper having a basis weight of 10 to 35 g / m ² A sanitary thin paper manufacturing method, wherein 0.005 to 50% by weight of an active ingredient excluding moisture is externally added.
Formula (3) ... R7COOH
In the formula (3), R7CO represents an acyl group having 10 to 24 carbon atoms.

In Formula (4), n is 1-3, R8 is a C1-C4 alkylene group, R9, R10 is a hydrogen atom or a C1-C3 alkyl group.   The method for producing sanitary thin paper according to claim 1 or 2, wherein at least one of a humectant, a softening agent and a filler is added to the solution prior to external addition to the thin paper.   A sanitary thin paper obtained by the method according to any one of claims 1 to 3.