JP7051579B2 - Nonwoven fabric for absorbent articles and film for absorbent articles - Google Patents

Description

The present invention relates to non-woven fabrics for absorbent articles and films for absorbent articles.

The absorbent article is mainly composed of a non-woven fabric and a film. The color of the non-woven fabric and the film affects the user's preference for whether the absorbent article worn on the skin is hygienic. For example, the less yellowing (lower yellowness), the brighter the color of the absorbent article, which often gives the user the impression that it is a new product (a product that has not deteriorated over time). In particular, in recent years, there has been a tendency to increase the whiteness of non-woven fabrics and films for absorbent articles, and even a slight yellowing may be mistakenly recognized as deterioration or stain by the viewer.
Further, the non-woven fabric and the film for the absorbent article may increase in yellowness (yellowing) with time even if the yellowness is initially low. The non-woven fabrics and films and absorbent articles that have been stored for a long period of time are avoided as old products due to the occurrence of yellowing.
Therefore, a non-woven fabric or a film for an absorbent article, which has less yellowing and suppresses yellowing with time, has been studied.
Patent Document 1 proposes a nonwoven fabric containing cellulosic fibers containing 0.015% by mass or more of an amine salt with respect to the nonwoven fabric as a nonwoven fabric in which color modification is suppressed with time.
Patent Document 2 proposes a nonwoven fabric having a high whiteness and a low yellowness without being bleached, in which the single yarn fineness constituting the cellulose fiber nonwoven fabric is reduced and the arrangement of fibers constituting the nonwoven fabric is controlled. ..

Japanese Unexamined Patent Publication No. 5-161566 Japanese Unexamined Patent Publication No. 2005-120719

The non-woven fabric described in Patent Document 1 prevents yellowing during wetness, and does not provide a non-woven fabric having a higher whiteness than immediately after production. Patent Document 2 does not describe color denaturation with time. In addition, neither document describes the suppression of yellowing of films for absorbent articles.
In view of the above points, the present invention provides a non-woven fabric for absorbent articles and a film for absorbent articles, which have less yellowing and suppress yellowing over time by means different from the inventions described in Patent Documents 1 and 2. Regarding providing.

The present inventors have conducted diligent studies in view of the above problems.
Conventionally, fatty acids have been used as a component of a fiber treatment agent for non-woven fabrics and as an additive for films. However, yellowing of non-woven fabrics and films can occur due to various factors, and since the original properties required for fatty acids (for example, as a dispersant) are prioritized, there was no idea of using fatty acids to suppress yellowing of members. In addition, the content of fatty acid is very small, and it was not considered that the yellowing property of the fatty acid itself actually leads to the suppression of yellowing of the members.
On the other hand, the present inventor has found that yellowing can be suppressed by specifying the fatty acid contained therein.
The present invention has been studied repeatedly based on this finding.

The present invention is a non-woven fabric having a fiber treatment agent, wherein the fiber treatment agent contains an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond. The mass of the total content (B) of the unsaturated fatty acid and the unsaturated fatty acid compound with respect to the total content (A) of the aliphatic saturated fatty acid having no double bond and the aliphatic saturated fatty acid compound having no double bond. Provided is a non-fatty acid for an absorbent article having a ratio (B / A × 100) of 1.5% by mass or less.
Further, the present invention is a film containing an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond, and the aliphatic saturated fatty acid having no double bond. The mass ratio (B / A × 100) of the total content (B) of the unsaturated fatty acid and the unsaturated fatty acid compound to the total content (A) of the fatty acid and the aliphatic saturated fatty acid compound having no double bond is Provided is a film for an absorbent article having an amount of 1.5% by mass or less.

Further, the present invention produces an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond from a raw material made of a vegetable fat or oil that does not contain animal fats and oils. A fiber treatment agent containing an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond is prepared, the fiber treatment agent is attached to the fiber, and a non-woven fabric having the fiber is prepared. Provided is a method for producing an absorbent article, which comprises a step of forming the non-fatty acid and incorporating the non-fatty acid.
In addition, the present invention produces an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond from a raw material made of a vegetable fat or oil that does not contain animal fats and oils. A step of melt-mixing an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond with a thermoplastic resin to form a film from the melt mixture, and incorporating the film. Provided is a method for producing an absorbent article having.

The non-woven fabric for absorbent articles and the film for absorbent articles of the present invention have less yellowing and suppress yellowing with time.

Hereinafter, the nonwoven fabric for absorbent articles and the film for absorbent articles of the present invention will be described in detail. The non-woven fabric for absorbent articles and the film for absorbent articles of the present invention can be used for parts that can be visually recognized by the user, such as the front sheet and the back sheet of the absorbent article.

The non-absorbent articles and film for absorbent articles of the present invention have an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond. In addition, the total content of the aliphatic saturated fatty acid having no double bond and the aliphatic saturated fatty acid compound having no double bond (A) in the non-woven fabric for absorbent articles and the film for absorbent articles of the present invention. ), The mass ratio (B / A × 100) of the total content (B) of the unsaturated fatty acid and the unsaturated fatty acid compound is 1.5% by mass or less. This means that the content ratio of fatty acid impurities (hereinafter, also simply referred to as impurities) such as unsaturated fatty acids and unsaturated fatty acid compounds is suppressed as small as possible with respect to the contained fatty acids. From this viewpoint, the mass ratio (B / A × 100) is more preferably 1% by mass or less, further preferably 0.5% by mass or less, and particularly preferably zero (0) mass%.

As a result, the non-woven fabric for absorbent articles and the film for absorbent articles of the present invention have less yellowing and suppress yellowing over time (that is, the saturation of yellowness in the nonwoven fabric and film is suppressed). .. Therefore, the non-woven fabric for absorbent articles and the film for absorbent articles of the present invention can give the viewer a recognition that they are new or of high quality without any deterioration in quality. For example, even when the absorbent article using these is used after storage, it does not give the user a false impression as if the absorbent article is deteriorated. Further, for example, it can be stored for a certain period of time for disaster stockpiling.

In the present invention, the aliphatic saturated fatty acid having no double bond means a saturated fatty acid among the aliphatics having no double bond in the bond between carbons. Fatty acids can be linear or branched, but linearity is the availability of raw materials, good ductility when applying fatty acids to fibers and non-woven fabrics, and the fact that fatty acids can be applied uniformly, such as resins. It is preferable in that the fluidity of the resin after kneading into is good.
As the aliphatic saturated fatty acid having no double bond in the present invention, a fatty acid having the performance required as a fatty acid in a fiber treatment agent for a non-woven fabric and an additive for a film can be appropriately adopted. For example, saturated monocarboxylic acid, saturated dicarboxylic acid, hydroxy acid can be mentioned. The performance required for the fatty acid is, for example, a performance as a dispersant in the case of a film, a performance of imparting hydrophilicity in the case of a fiber treatment agent in a nonwoven fabric, and prevention of adhesion to a nonwoven fabric manufacturing apparatus. Performance etc.

Aliphatic saturated fatty acids having no double bond have 10 or more carbon atoms from the viewpoint of availability of natural fats and oils as raw materials, performance required as the above fatty acids, and suppression of yellowing. Preferably, 14 or more are more preferable. From the same viewpoint, those of 28 or less are preferable, and those of 20 or less are more preferable. A plurality of aliphatic saturated fatty acids having different carbon atom numbers and no double bond can be used in combination.

(Saturated monocarboxylic acid, which is an aliphatic saturated fatty acid that does not have a double bond)
Specific examples of saturated monocarboxylic acid, which is an aliphatic saturated fatty acid having no double bond, include caproic acid, enanthic acid, capric acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid and myristine. Examples thereof include acids, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, nonadecanoic acid, arachidic acid, behenic acid, tricosyl acid, lignoseric acid, cellotic acid, montanic acid and melicic acid.
(Saturated dicarboxylic acid, which is an aliphatic saturated fatty acid that does not have a double bond)
Specific examples of the saturated dicarboxylic acid (aliphatic dicarboxylic acid), which is an aliphatic saturated fatty acid having no double bond, include malonic acid, succinic acid, glutanoic acid, adipic acid, heptanedicarboxylic acid, and octanedicarboxylic acid. Nonandicarboxylic acid, decandicarboxylic acid, undecandicarboxylic acid, dodecandicarboxylic acid, tridecandicarboxylic acid, tetradecanedicarboxylic acid, pentadecanedicarboxylic acid, hexadecandicarboxylic acid, heptadecanedicarboxylic acid, octadecanedicarboxylic acid, nanodecanedicarboxylic acid, icosandicarboxylic acid Examples thereof include acids, henicosandicarboxylic acids and docosandicarboxylic acids.
(Hydroxy acids, which are aliphatic saturated fatty acids that do not have double bonds)
Specific examples of hydroxy acid, which is an aliphatic saturated fatty acid having no double bond, include glycolic acid, lactic acid, tartronic acid, glyceric acid, and hydroxybutyric acid (2-hydroxybutyric acid, 3-hydroxybutyric acid, and γ-hydroxybutyric acid). , Malic acid, tartaric acid, etc.
(Saturated branched fatty acid)
Examples of the saturated branched fatty acid include phytanic acid and mevalonic acid, and examples of the hydroxy acid include citric acid, isocitric acid and pantoic acid.

In the present invention, the aliphatic saturated fatty acid compound having no double bond means a compound made of a saturated fatty acid among the aliphatic compounds having no double bond in the bond between carbons. The compound as a whole does not have a double bond in the bond between carbons. Similarly, the fatty acid group can be linear or branched, but the linearity has good availability of raw materials, spreadability when the fatty acid compound is applied to fibers or non-woven fabric, and can be applied uniformly. It is preferable because the fluidity of the resin after kneading the fatty acid compound into the resin or the like is good.
As the aliphatic saturated fatty acid compound having no double bond in the present invention, the above-mentioned aliphatic saturated fatty acid having no double bond can be used depending on the performance required for the fiber treatment agent for non-woven fabrics and the additive for the film. Examples thereof include those synthesized by reacting with other components. That is, examples thereof include those in which other components are added to fatty acids, mixed, and then the mixed components are reacted and synthesized. Specific examples thereof include a reaction product of the aliphatic saturated fatty acid having no double bond and an organic compound, and a metal salt of the aliphatic saturated fatty acid having no double bond. Examples of the organic compound include glycerin, polyglycerin, sorbitan, polyoxyethylene, polyoxypropylene and the like. Examples of the metal include sodium, magnesium, aluminum, potassium, calcium, zinc, tin and the like.

(Metal salt of aliphatic saturated fatty acid without double bond)
Specific examples of metal salts of aliphatic saturated fatty acids having no double bond include alkali metals (eg, sodium, potassium, etc.), alkaline earth metals (eg, calcium, magnesium, barium, etc.), transition metals (eg, calcium, magnesium, barium, etc.). , Zinc, cadmium, etc., Periodic Table Group 2B metal, etc.), Periodic Table Group 3B metal (eg, aluminum, etc.), Periodic Table Group 4B metal (eg, tin, lead, etc.) and double bonds. Examples thereof include salts with a non-existent aliphatic saturated fatty acid (such as the above-exemplified aliphatic saturated fatty acid having no double bond). For example, higher aliphatic saturated fatty acid metal salts having no double bond (for example, calcium stearate, zinc stearate, calcium behenate, etc.) and the like can be mentioned.

(Reactant of aliphatic saturated fatty acid having no double bond with organic compound)
Specific examples of the reaction product of the aliphatic saturated fatty acid having no double bond with the organic compound include an aliphatic saturated fatty acid ester having no double bond, a metal salt thereof, and a cyclic structure having no double bond. Fatty acid saturated fatty acid ester, aliphatic saturated fatty acid amide without double bond, aliphatic saturated fatty acid betaine without double bond, alkylene oxide adduct of aliphatic saturated fatty acid without double bond, An alkylene oxide adduct of an aliphatic saturated fatty acid amide that does not have a double bond, an ester of an aliphatic saturated fatty acid that does not have a double bond and a polyhydric alcohol (including monoglyceride, diglyceride, triglyceride, etc.), and a double bond. Examples thereof include an alkylene oxide adduct of an aliphatic saturated fatty acid polyhydric alcohol ester which does not have. In addition, a polyhydroxy ester (a hydroxy aliphatic saturated fatty acid polyhydric alcohol ester having no double bond) and an alkylene oxide adduct of a hydroxy aliphatic saturated fatty acid having no double bond (a fat having no double bond). A structure in which a polyoxyalkylene group is bonded to a hydrocarbon group of a group saturated fatty acid via an oxygen atom) can be mentioned. Further, the above-mentioned derivative of the aliphatic saturated fatty acid dicarboxylic acid having no double bond can be mentioned.

(Alphatic saturated fatty acid ester having no double bond and its metal salt)
The aliphatic saturated fatty acid ester having no double bond is an ester of an aliphatic saturated fatty acid having no double bond (such as the above-exemplified aliphatic saturated fatty acid having no double bond) and an alcohol.
As the alcohol, monool [C1-30 alkanol such as aliphatic monool (for example, methanol, ethanol, propanol, butanol, hexanol, octanol, decanol, lauryl alcohol, stearyl alcohol, preferably C1-18 alkyl alcohol, more preferably. C2-10 alkanol, etc.)]; polyol (or polyhydric alcohol) {eg, aliphatic polyols [eg, alkanediol (ethylene glycol, trimethylene glycol, propylene glycol, 1,3-butanediol, 1,4-) Butanediol, 1,6-hexanediol, C2-10 alkylene glycol such as neopentyl glycol, preferably C2-6 alkylene glycol, etc., alcohol polyols (eg, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, etc.) C2-10 alcan polyols, preferably C2-6 alcan polyols, etc.), polyol oligomers (eg, (poly) oxyC2-4 alkylene glycols such as diethylene glycol, dipropylene glycol, etc.)]} and the like.
Non-limiting examples of aliphatic saturated fatty acid esters having no preferred double bond are saturated fatty acids derived from a mixture of long-chain saturated fatty acids and short-chain monovalent alcohols, preferably saturated fatty acids having 16 or more and 24 or more carbon atoms and short chains. Examples thereof include aliphatic saturated fatty acid esters having no double bond derived from a mixture of chain monovalent alcohols. The long chain means that the number of carbon atoms is 12 or more, and the number of carbon atoms is preferably 12 or more and 28 or less. The short chain means that the number of carbon atoms is 1 or more and 8 or less, and preferably 1 or more and 3 or less carbon atoms. Fatty acid saturated fatty acid esters without suitable double bonds are also derived from esters of long chain fatty alcohols (preferably 12 to 16 carbon atoms) with shorter chain fatty acids such as lactic acid. Specific examples thereof include lauryl lactate and cetyl lactate.
More specifically, methyl palmitate, methyl stearate, isopropyl laurate, isopropyl myristate, isopropyl palmitate, ethylhexyl palmitate, stearyl stearate, palmityl stearate, stearyl behenate, cetyl stearate, cetyl behenate, Examples thereof include cetyl palmitate, cetearyl behenate, behenyl behenate, stearyl heptanoate, stearyl octanoate, myristyl myristate, and mixtures thereof.
Examples of the aliphatic saturated fatty acid ester metal salt having no double bond include an alkyl phosphate ester sodium salt and an alkyl phosphate ester potassium salt, which are saturated fatty acids having 14 or more and 22 or less carbon atoms in an alkyl group. In a non-woven fabric coated with these activators, hydrophilicity is maintained even after contact with urine or the like, which is preferable.

(Cyclic aliphatic saturated fatty acid ester without double bond)
Specific examples of the cyclic aliphatic saturated fatty acid ester having no double bond include sorbitan fatty acid ester.

(Alphatic saturated fatty acid amide without double bond)
Aliphatic saturated fatty acid amides that do not have double bonds transfer hydrogen atoms of amines or ammonia to aliphatic saturated fatty acids that do not have double bonds (such as the above-exemplified aliphatic saturated fatty acids that do not have double bonds). It is a compound substituted with the corresponding acid group. The amine may be a primary amine (or N-monosubstituted amine) or a secondary amine (or N, N-disubstituted amine), or may be a monoamine or a polyamine.
Specific aliphatic saturated fatty acid amides having no double bond include aliphatic saturated fatty acid monoamides having no double bond and aliphatic saturated fatty acid polyamides (polyfatty acid amide) having no double bond. Etc. are included.
Examples of the aliphatic saturated fatty acid monoamides having no double bond include alkanecarboxylic acid monoamides. Alcan carboxylic acid monoamides include, for example, alkane carboxylic acid monoamides [eg, lauric acid amide, myristic acid amide, palmitic acid amide, stearic acid amide, araquinic acid amide, behenic acid amide, montanic acid amide, 12-hydroxystearic acid. C8-40 alkanocarboxylic acid monoamides such as amides (preferably C12-36 alcancarboxylic acid monoamides, more preferably C16-34 alcancarboxylic acid monoamides, especially C18-32 alcancarboxylic acid monoamides, etc.); Acid Monoamides [eg, N-methylpalmitic acid amides, N-palmityl palmitic acid amides, N-methylstearic acid amides, N, N-dimethylstearic acid amides, N-methylol stearate amides, N-palmityl stearate amides. , N-Hydroxyethyl stearate amide, N-stearyl stearate amide, N-stearyl-12-hydroxystearic acid amide, N-hydroxyethyl-12-hydroxystearic acid amide, stearoamide ethyl stearate, stearate anilide, etc. N-Substituted C8-40 Alcan Carboxylic Acid Monoamide (preferably N-Substituted C12-36 Alcan Carboxylic Acid Monoamide, more preferably N-Substituted C16-34 Alcan Carboxylic Acid Monoamide, especially N-Substituted C18-32 Alcan Carboxylic Acid Monoamide Etc.) etc.] etc. More specifically, polyoxyethylene (additional number of moles: 2 to 5) stearylamide and polyoxypropylene (additional number of moles: 2 to 5) stearylamide are preferable.

(Alphatic saturated fatty acid betaine without double bond)
Lauryl betaine, myristyl betaine, palmityl betaine, stearyl betaine, behenyl betaine and the like are preferable.

(Alkylene oxide adduct of aliphatic saturated fatty acid without double bond)
Examples of the alkylene oxide adduct of the aliphatic saturated fatty acid having no double bond include alkylene oxide adducts of higher alcohols such as octyl alcohol, decyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol and stearyl alcohol;
Alkylene oxide adducts of higher fatty acids such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid;
Higher fatty acid amides and their alkylene oxide adducts;
Alkylene oxide adducts of higher alkylamines such as octylamine, decylamine, laurylamine, myristylamine, palmitylamine, stearic acid; monolauric acid glyceride (molecular weight 500 or less), monomyristic acid glyceride (molecular weight 500 or less), monopalmitic acid. Multivalent glycerides (molecular weight 500 or less), monostearic acid glyceride (molecular weight 500 or less), sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan trilaurate, sorbitan tripalmitate, sorbitan tristearate, etc. Examples thereof include alcohol fatty acid esters and alkylene oxide adducts thereof.

(Polyglycerin aliphatic saturated fatty acid ester without double bond)
The polyglycerin aliphatic saturated fatty acid ester having no double bond is a compound obtained by esterifying a glycerin condensate and an aliphatic saturated fatty acid having no double bond. Examples of the condensate of glycerin include diglycerin, triglycerin, tetraglycerin, pentaglycerin, hexaglycerin, heptaglycerin, octaglycerin, nonaglycerin, decaglycerin, undecaneglycerin, tridecaglycerin, detradecaglycerin and pentadecaglycerin. , Hexadecaglycerin, heptadecaglycerin, octadecaglycerin and the like. The carbon number of the aliphatic saturated fatty acid having no double bond may be distributed.

(Hydroxyaliphatic saturated fatty acid polyhydric alcohol ester without double bond)
The condensate is a condensate of a polyoxyalkylene group-containing hydroxyaliphatic saturated fatty acid polyhydric alcohol ester (hereinafter, may be referred to as a polyhydroxy ester) having no double bond and a dicarboxylic acid (or a dicarboxylic acid derivative). be.
The polyhydroxy ester is structurally an ester of a hydroxyaliphatic saturated fatty acid containing a polyoxyalkylene group and a polyhydric alcohol, and two or more (preferably all) hydroxyl groups of the hydroxyl groups of the polyhydric alcohol are esterified. Is preferable. Further, the polyoxyalkylene group-containing hydroxy aliphatic saturated fatty acid polyhydric alcohol ester having no double bond is an ester having a plurality of hydroxyl groups.

(Derivative of aliphatic saturated fatty acid dicarboxylic acid without double bond)
Derivatives of aliphatic saturated fatty acid dicarboxylic acids that do not have double bonds include mono- or di-glycerides, such as those derived from saturated fatty acids or fatty acid mixtures. Examples of mono- or diglycerides include mono- or di-C12-24 fatty acid glycerides, in particular mono- or di-C16-20 fatty acid glycerides, such as glyceryl monostearate, glyceryl distearate.
Further, an ester of an aliphatic saturated fatty acid having 6 or more and 22 or less carbon atoms and having no double bond and an alcohol can be mentioned.
The carbon number of the aliphatic saturated fatty acid dicarboxylic acid having no double bond may be distributed. The carbon number of the aliphatic saturated fatty acid dicarboxylic acid having no double bond is preferably 3 or more and 22 or less, more preferably 4 or more, further preferably 5 or more, particularly preferably 6 or more, preferably 22 or less, and 20 or less. The following is more preferable, 19 or less is further preferable, and 18 or less is particularly preferable.
As the alkylene oxide adduct of the aliphatic saturated fatty acid dicarboxylic acid having no double bond, the carbon number of the alkylene oxide is preferably 2 or more and 4 or less. When two or more kinds of alkylene oxides are added, the order of addition thereof is not particularly limited, and the addition form may be either block-shaped or random-shaped. The number of moles of alkylene oxide added is preferably 10 or more, more preferably 10 or more, particularly preferably 10 or more, most preferably 10 or more, preferably 150 or less, further preferably 50 or less, and particularly preferably 40 or less. 30 or less is most preferable.

In the present invention, the unsaturated fatty acid compound is a compound obtained by adding other components to an unsaturated fatty acid, mixing them, and then reacting and synthesizing the mixed components. Specifically, it means a reaction product of each of the unsaturated fatty acid compounds and the above-mentioned organic compound, and the above-mentioned metal salt.

(Unsaturated fatty acids)
As unsaturated fatty acids, as mono-unsaturated fatty acids, acrylic acid, methacrylic acid, crotonic acid, myristoleic acid, palmitoleic acid, sapienoic acid, oleic acid, elladic acid, baxenoic acid, gadrainic acid, eicosenoic acid (pauric acid), Elcaic acid, nerbonic acid and the like are diunsaturated fatty acids such as linoleic acid, eikosadienic acid and docosadienoic acid, and triunsaturated fatty acids are α-linolenic acid, γ-linolenic acid, pinolenic acid, eleostearic acid and mead. Acids, dihomo-γ-linolenic acid, eicosatrienic acid, etc. are tetraunsaturated fatty acids such as stearidonic acid, arachidonic acid, eikosatetraenoic acid, adrenoic acid, etc. Acids, docosapentaenoic acid, osbondic acid, sardine acid, tetracosapentaenoic acid and the like, and hexaunsaturated fatty acids include docosahexaenoic acid and heric acid. Moreover, maleic acid, fumaric acid and the like are mentioned as an unsaturated dicarboxylic acid. Further, examples of the unsaturated aliphatic hydroxy acid include ricinoleic acid.

Examples of the reaction product of the unsaturated fatty acid compound with the organic compound include unsaturated fatty acid esters and unsaturated fatty acid amides. Specifically, the unsaturated fatty acid ester is a compound of an unsaturated fatty acid and an alcohol, and the alcohol includes the alcohol. Examples of the unsaturated fatty acid amide include betaine oleate amide propyl dimethylamino acetate.
Examples of the metal salt of the unsaturated fatty acid compound include higher unsaturated fatty acid metal salts such as sodium oleate, calcium oleate, zinc oleate, and zinc erucate.

In the non-woven fabric for absorbent articles and the film for absorbent articles of the present invention, the ratio of the above-mentioned impurities is suppressed as described above by using a raw material made of vegetable fats and oils containing no animal fats and oils at the time of producing fatty acids. It is possible by producing an aliphatic saturated fatty acid having no double bond. In this respect, the reason is not clear, but since fatty acids produced using animal fats and oils contain many impurities (unsaturated fatty acids), it is possible to obtain the above mass ratio by not including animal fats and oils. It is thought that The method for producing an aliphatic saturated fatty acid having no double bond can be carried out by a usual method using the above-mentioned raw material, vegetable oil or fat. For example, by extracting and purifying fats and oils from plants, decomposing the fats and oils, and separating, curing (hydrogenating), and distilling the obtained components, aliphatic saturated fatty acids having no double bond as a raw material can be obtained. Obtainable.
Further, by reacting and synthesizing the obtained aliphatic saturated fatty acid compound having no double bond with an organic substance or metal, a desired aliphatic saturated fatty acid compound having no double bond can be obtained. Such treatment is performed as necessary depending on the purpose of the obtained nonwoven fabric or film. For example, when a film is opened to form a moisture-permeable sheet, an organic substance is added to and reacted with the above-mentioned aliphatic saturated fatty acid compound which does not have a double bond to obtain a desired double bond. It is mentioned that it is an aliphatic saturated fatty acid compound that does not.

The mass ratio (B / A × 100) can be confirmed by the following method.
Specimens are collected from a non-woven fabric for absorbent articles or a film for absorbent articles, immersed in hexane, irradiated with ultrasonic waves, and then stored for 5 hours. The obtained extract is dried and solidified with a solvent distiller, and then chloroform is added to dissolve it again. Further, it is dried and solidified again using a solvent distilling device.
The obtained extract is dissolved in chloroform and analyzed by gas chromatography-mass spectrometry (quantitative analysis). Of the measured peaks, components of less than 0.1% by mass, which are trace components, are not included in the following contents (A, B). When collecting the non-woven fabric and the film from the absorbent article, select a portion to which the hot melt or the like used for assembling the absorbent article does not adhere, and cut and collect the non-woven fabric and the film with a cutter or the like.
In the obtained analytical data, the presence or absence of a double bond was confirmed from the molecular weight, the number of carbon atoms, and the number of hydrogens in the extract, and the aliphatic saturated fatty acid having no double bond and having no double bond. The mass ratio (B / A × 100) of the content (B) of the unsaturated fatty acid and the unsaturated fatty acid compound (B) to the content (A) of the aliphatic saturated fatty acid compound is determined.

Next, each of the non-woven fabric for absorbent articles and the film for absorbent articles of the present invention will be described.

In the non-woven fabric for absorbent articles of the present invention, the above-mentioned aliphatic saturated fatty acid having no double bond and / or the aliphatic saturated fatty acid compound having no double bond is contained in the fiber treatment agent. "Containing an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond" is an embodiment containing only an aliphatic saturated fatty acid having no double bond. , An embodiment containing only an aliphatic saturated fatty acid compound having no double bond, and an embodiment containing an aliphatic saturated fatty acid having no double bond and an aliphatic saturated fatty acid compound having no double bond. Including. Aliphatic saturated fatty acids having no double bond and / or aliphatic saturated fatty acid compounds having no double bond can be contained in a fiber treatment agent and adhered to the fibers during the production of the non-woven fabric to the machine of the non-woven fabric. Adhesion (burning) can be prevented.
At that time, as described above, the content of the unsaturated fatty acid and the unsaturated fatty acid compound relative to the content (A) of the aliphatic saturated fatty acid having no double bond and the aliphatic saturated fatty acid compound having no double bond. The mass ratio (B / A × 100) of (B) is 1.5% by mass or less. As a result, as described above, the nonwoven fabric for absorbent articles of the present invention has less yellowing and suppresses yellowing with time. That is, the saturation of yellowness is suppressed to a low level. As a result, the whiteness of the non-woven fabric for absorbent articles of the present invention is enhanced, and it is possible to give the viewer the recognition that the non-woven fabric is new or of high quality without any deterioration in quality.

The fiber treatment agent is not particularly limited as long as it contains the above-mentioned aliphatic saturated fatty acid having no double bond and / or the aliphatic saturated fatty acid compound having no double bond, and is usually used for a non-woven fabric. You can use things.
The total content (A) of the aliphatic saturated fatty acid having no double bond and the aliphatic saturated fatty acid compound having no double bond in the fiber treatment agent has the quality required for the fatty acid in the fiber treatment agent. From the viewpoint of suppressing yellowing, 1% by mass or more is preferable, and 10% by mass or more is more preferable in 100% by mass of the fiber treatment agent. From the same viewpoint, 70% by mass or less is preferable, 50% by mass or less is more preferable, and 30% by mass or less is further preferable. Here, the quality required for the fatty acid in the fiber treatment agent mainly includes the quality required for the productivity when the fiber is made into a non-woven fabric and the quality required for the performance of the product. The former is, for example, prevention of adhesion to a non-woven fabric manufacturing apparatus, heat resistance, and the like. The latter includes prohydrophobicity and durability of prohydrophobicity.

In the non-woven fabric for absorbent articles of the present invention, it is preferable that a color tone changing agent is added to the constituent fibers, and the amount of the addition is 1 mass with respect to the total mass of the fibers containing the color tone changing material, the fiber treatment agent and the like. % Or more is preferable. The "color tone changing agent" refers to an agent having an action of lowering the transmittance of light incident on the non-woven fabric and scattering it. By adding an amount of this color change agent to 1% by mass or more with respect to the total mass of the fiber, a so-called "full dull" fiber that does not transmit light most is obtained. As a result, if the fibers are not colored, the whiteness of the nonwoven fabric becomes high, and it is possible to give the impression that the product is hygienic. If there is a slight yellowing at this time, this point will be emphasized and become more noticeable. On the other hand, the non-woven fabric for absorbent articles of the present invention has a high effect of whiteness due to the "color tone changing agent", so that it is an aliphatic saturated fatty acid having no double bond and / or a fat having no double bond. It is recognized that the effect of suppressing yellowing and suppressing yellowing over time by containing the group saturated fatty acid compound is certain. That is, the effect of suppressing yellowing is conspicuous with respect to the whiteness whose lightness is enhanced by the "color tone changing agent", and the whiteness of the non-woven fabric is recognized as having higher purity.
What kind of fiber is used for suppressing yellowing and suppressing yellowing over time by containing an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond? It can also be obtained as a non-woven fabric (for example, a non-woven fabric made of so-called semidal fibers or bright fibers). However, in the case of the above-mentioned "the amount of the color tone changing agent added to the fiber is 1% by mass or more with respect to the total mass of the fiber", the effect is more strongly exhibited.

The above-mentioned "addition amount of the color tone changing agent" is more preferably 2% by mass or more, still more preferably 3% by mass or more, based on the total mass of the fibers. Further, 30% by mass or less is more preferable, and 10% by mass or less is further preferable. The "total mass of the fibers" is the total mass of the fibers incorporated as the constituent fibers of the nonwoven fabric, and is the mass containing all of the above-mentioned additives.

Here, the above-mentioned "semi-dull" fiber is a fiber having a relatively low light transmittance and having a mass of a color tone changing material of less than 1% by mass per fiber unit mass. The above-mentioned "full dull" fiber is a fiber having a low light transmittance and having a mass of 1% by mass or more of a color tone changing material per fiber unit mass. As a method for determining "semi-dull" and "full-dull", JIS L 1013: 2010 chemical fiber filament yarn test method and 8.25 ash measurement method are used. By this measuring method, the ash content per fiber unit mass can be obtained, and the ash content per fiber unit mass can be determined as the content of the color tone changing material.

Examples of the above-mentioned "color tone changing agent" include inorganic powders and organic powders having a refractive index different from that of the constituent fibers of the non-woven fabric.
Examples of the inorganic powder include titanium dioxide, porous silicon oxide (silica), porous silica, aluminum oxide (alumina), lime, and clay minerals. Examples of clay minerals include smectite, montmorillonite, bentonite, kaolinite, sericite, illite, gloconite, chlorite, zeolite, talc, and mizukanite.
Organic powders include polyethylene powder, polyester powder, polypropylene powder, polyacrylic powder, polyacrylate powder, cellulose powder, viscous powder, silk powder, silicone compound powder, and fluorine compound powder. , Etc. can be mentioned. Further, examples thereof include those obtained by coloring these organic powders with a dye.
Among these, titanium dioxide is particularly preferable in terms of the effect of changing the color tone, the price, and the ease of addition to the fiber.

Further, the nonwoven fabric for absorbent articles of the present invention preferably contains fibers having a fineness of 3 dtex or less. By reducing the fineness, the scattering rate of the light incident on the non-woven fabric is increased. As a result, the whiteness of the nonwoven fabric is increased if the fibers are not colored, as described in the above-mentioned "color tone changing agent". The effects of suppressing yellowing and suppressing yellowing over time by containing an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond are more strongly exhibited. To. From this viewpoint, the fibers having a fineness of 3 dtex or less are preferably 20% by mass or more, more preferably 35% by mass or more, and most preferably all fibers are 3 dtex or less as the mass ratio to the total mass of the fibers of the entire nonwoven fabric. ..

The fineness of the fiber of 3 dtex or less is preferably 2 dtex or less, more preferably 1.5 dtex or less. The fineness of the fiber and the amount of the color tone changing agent added may be selectively adopted in the non-woven fabric for absorbent articles of the present invention, or both may be adopted at the same time.

(Measurement method of fineness)
The fineness of the fiber before the non-woven fabric processing can be obtained in accordance with JIS L1015.
The fineness of the non-woven fabric and the fineness of the fiber at each part of the non-woven fabric can be obtained from the fiber diameter of the fiber cross section. The cross-sectional shape of the fiber is measured with an electron microscope or the like, and the cross-sectional area of the fiber (in the case of a fiber formed of a plurality of resins, the cross-sectional area of each resin component) is measured. At the same time, the DSC (differential thermal analyzer) is used to specify the type of resin (in the case of a plurality of resins, an approximate component ratio), determine the specific gravity, and calculate the fineness. For example, in the case of a short fiber composed of polyethylene terephthalate (PET), the cross section is first observed and the cross section is calculated. Then, by measuring with DSC, it is identified that it is composed of a single component resin from the melting point and the peak shape, and that it is a PET core. Then, the fineness is calculated by calculating the mass of the fiber using the density and cross-sectional area of the PET resin.

As the fibers constituting the non-woven fabric for absorbent articles of the present invention, those usually used for this kind of articles can be adopted without particular limitation. For example, a fiber having a thermoplastic resin as a component can be mentioned. Examples of the thermoplastic resin include a polyolefin resin, a polyester resin, a polyamide resin, an acrylonitrile resin, a vinyl resin, and a vinylidene resin. Examples of the polyolefin resin include polyethylene, polypropylene, polybuden and the like. Examples of the polyester resin include polyethylene terephthalate and polybutylene terephthalate. Examples of the polyamide resin include nylon and the like. Examples of the vinyl resin include polyvinyl chloride and the like. Examples of the vinylidene resin include polyvinylidene chloride and the like. One of these various resins can be used alone or in combination of two or more, and variants of these various resins can also be used.
Further, a composite fiber can also be used as the fiber. As the composite fiber, side-by-side fiber, core-sheath fiber, core-sheath fiber having eccentric crimp, split fiber and the like can be used. When a composite fiber is used, a core-sheath fiber having a core made of polyethylene terephthalate and a sheath made of polyethylene is preferable.

Next, the film for absorbent articles of the present invention will be described.
In the film for absorbent articles of the present invention, the above-mentioned aliphatic saturated fatty acid having no double bond and / or the aliphatic saturated fatty acid compound having no double bond may be added by any method. However, from the viewpoint of the original function of fatty acid as a dispersant for molten resin during film production and as a pore-opening aid when forming a porous film, the film is produced by melt-kneading with a thermoplastic resin. Is preferable. When the film contains an inorganic filler and is used as a dispersant thereof, it may be used in a state of being previously applied to the surface of the inorganic filler. In this case, like the non-woven fabric, it has an embodiment containing only an aliphatic saturated fatty acid having no double bond, an embodiment containing only an aliphatic saturated fatty acid compound having no double bond, and a double bond. It includes an embodiment containing no aliphatic saturated fatty acid and an aliphatic saturated fatty acid compound having no double bond. At the time of film production, the aliphatic saturated fatty acid having no double bond is mainly used as a component for promoting the dispersion of the inorganic filler, and the aliphatic saturated fatty acid compound having no double bond is mainly used to open the film. Used as a component that promotes pores.
At that time, as described above, the content of the unsaturated fatty acid and the unsaturated fatty acid compound relative to the content (A) of the aliphatic saturated fatty acid having no double bond and the aliphatic saturated fatty acid compound having no double bond. The mass ratio (B / A × 100) of (B) is 1.5% by mass or less. As a result, as described above, the film for absorbent articles of the present invention has less yellowing and suppresses yellowing with time. That is, the saturation of yellowness is suppressed to a low level. As a result, the whiteness of the film for absorbent articles of the present invention is enhanced, and it is possible to give the viewer the recognition that the film is new or of high quality without any deterioration in quality.

As the material of the film, those usually used for absorbent articles can be used without particular limitation. For example, a thermoplastic resin is preferable. Examples of the thermoplastic resin include polyolefin resins and polyester resins. Among them, polyolefin resin is preferable, and polyethylene (for example, linear low density polyethylene (LLDPE) resin, polypropylene resin, polylactic acid resin and the like can be mentioned.

The film for absorbent articles of the present invention preferably contains an inorganic filler in an amount of 40% by mass or more based on the total mass of the film. As a result, a plurality of predetermined holes are formed in the film to form a breathable film. At the same time, light is easily scattered by the pores, and if the film is not colored, the whiteness is greatly increased as compared with the unopened film as in the above-mentioned non-woven fabric for absorbent articles of the present invention.
Contains aliphatic saturated fatty acids without double bonds and / or aliphatic saturated fatty acid compounds without double bonds due to the high effect of whiteness due to "inorganic filler" and "diffuse reflection of light by opening". It is recognized that the effect of suppressing yellowing and suppressing yellowing over time is certain. That is, the effect of suppressing yellowing is conspicuous with respect to the whiteness whose brightness is enhanced by the "inorganic filler" and the "opening", and the whiteness of the non-woven fabric is recognized as having higher purity.

From this viewpoint, the inorganic filler is more preferably 45% by mass or more, still more preferably 50% by mass or more, based on the total mass of the film. Further, the inorganic filler is preferably 70% by mass or less, more preferably 65% by mass or less, still more preferably 60% by mass or less, based on the total mass of the film, from the viewpoint of preventing the filler from agglomerating. The "total mass of the film" is the total mass of the film to be molded, and is the mass containing all of the above-mentioned additives.

From the viewpoint of improving the whiteness, the film for absorbent articles of the present invention preferably has a pore area ratio of 2.5% or more, more preferably 3.5% or more, and 4.5%. % Or more is more preferable. Further, the film for an absorbent article of the present invention has a perforated area from the viewpoint of preventing leakage of body fluid when used as an absorbent article and from the viewpoint of preventing tearing from the perforated portion during film production. The rate is preferably 26% or less, more preferably 16% or less, still more preferably 12% or less. The pores are formed by stretching during film production, and are formed by the above-mentioned aliphatic saturated fatty acid having no double bond and / or the aliphatic saturated fatty acid compound having no double bond and the inorganic filler. .. In particular, aliphatic saturated fatty acid compounds having no double bond promote pore opening. Also, the aliphatic saturated fatty acids having no double bond promote uniform dispersion of the inorganic filler in the film.

Examples of the inorganic filler include calcium carbonate, barium sulfate, zinc oxide, talc, zeolite, carbon, silica, and silicate minerals. Calcium carbonate is preferable from the viewpoint of easy availability, easy adjustment of particle size, and price.

(Measuring method of opening area ratio)
The perforation area ratio is the ratio of the area of the perforated part of the surface to the area of the entire film surface (area of the perforated part of the surface / film surface) by photographing the surface of the film with an electron microscope and using a gravimetric method or image analysis. It can be obtained as the total area × 100).

As described above, the non-woven fabric for absorbent articles and the film for absorbent articles of the present invention preferably have a high degree of whiteness. From the viewpoint of further enhancing the effect of the present invention, the sheet b value (hereinafter, also simply referred to as b value) is preferably 2 or less, and more preferably 1 or less. Further, the b value is preferably 0 or more. This b value is a b value of the Hunter Lab color system, and is measured by, for example, "Lab Scan XE" of HunterLab in the United States, and indicates the degree of blue to yellow tint of the object to be measured. When the target non-woven fabric and film are thin, a plurality of sheets are stacked and the measurement is performed without being affected by the color of the base.

The non-woven fabric for absorbent articles and the film for absorbent articles of the present invention are used as components of absorbent articles. Absorbent articles include, for example, diapers, menstrual napkins, urine pads, panty liners, and various other items having the function of absorbing and retaining human excrement.
The non-woven fabric for absorbent articles is used as various members of the absorbent article according to its function, and is incorporated into the absorbent article. For example, if it has liquid permeability, it is incorporated as a surface sheet, and if it has water repellency, it is incorporated as a side sheet. When it has liquid diffusivity, it is incorporated as a second sheet between the surface sheet and the absorber or as a covering sheet covering the outer surface of the absorber. Alternatively, it is made thinner and softer and incorporated as an exterior material that improves the feel of the outside (clothing side) of absorbent articles such as diapers.
On the other hand, the film for absorbent articles is a member that enhances leakage resistance, and is mainly incorporated as a back sheet on the non-skin surface side (clothing side) of the absorber.

Next, a preferred embodiment of the method for producing an absorbent article according to the present invention will be described.

First, as described above, "aliphatic saturated fatty acids having no double bond and / or aliphatic saturated fatty acid compounds having no double bond" are used using a raw material consisting of vegetable fats and oils that do not contain animal fats and oils. To manufacture. At this time, it is preferable to avoid the apparatus using the animal fat or oil before so that the animal fat or oil is not mixed. Thereby, the above-mentioned "mass ratio (B / A × 100) 1.5 mass% or less" can be realized. The vegetable oil can be appropriately selected depending on the intended purpose. For example, palm kernel oil and coconut oil are preferable as raw materials because they contain a large amount of saturated fatty acids.

With respect to the non-woven fabric for absorbent articles of the present invention, the above-mentioned "aliphatic saturated fatty acid having no double bond and / or the aliphatic saturated fatty acid compound having no double bond" is mixed with a fiber treatment agent to obtain a desired content. Adjust the fiber treatment agent. Then, the obtained fiber treatment agent is attached to the fiber. At this time, in the fiber treatment agent, the content of the unsaturated fatty acid and the unsaturated fatty acid compound is relative to the content (A) of the aliphatic saturated fatty acid having no double bond and the aliphatic saturated fatty acid compound having no double bond. The mass ratio (B / A × 100) of (B) is 1.5% by mass or less.
The method for adhering the fiber treatment agent to the fiber is not particularly limited, and various methods used for producing the nonwoven fabric can be adopted without particular limitation. For example, application by spray, application by slot coater, application by roll transfer, immersion in fiber treatment agent and the like can be mentioned. These treatments may be performed on the fibers before webization, or may be performed after the fibers have been webized by various methods. The fibers to which the fiber treatment agent is attached to the surface are preferably dried by, for example, a hot air blowing type dryer. The non-woven fabric for absorbent articles of the present invention can be formed by a usual method. At that time, it is formed as having a basis weight, density, thickness, etc. according to the purpose.
When a color tone changing agent such as titanium dioxide described above is used, it is contained in advance at the time of forming the fiber.

On the other hand, with respect to the film for absorbent articles of the present invention, the above-mentioned "aliphatic saturated fatty acid having no double bond and / or the aliphatic saturated fatty acid compound having no double bond" is used as a raw material for the film. It is melt-mixed with a resin, and a film is produced from the melt mixture by a commonly used method. At this time, in the melt-kneaded product, the content of the unsaturated fatty acid and the unsaturated fatty acid compound is relative to the content (A) of the aliphatic saturated fatty acid having no double bond and the aliphatic saturated fatty acid compound having no double bond. The mass ratio (B / A × 100) of (B) is 1.5% by mass or less.
When the above-mentioned inorganic filler is used, it is added to the molten mixture.

The obtained nonwoven fabric for absorbent articles and film for absorbent articles of the present invention are incorporated as predetermined constituent members in the absorbent article according to the purpose. At that time, it is prepared by cutting the size and shape according to the purpose, and placed in a predetermined position with respect to other constituent members. Then, if necessary, it is rotated together with other members or folded and joined to produce the desired absorbent article.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.

(Example 1)
In the production of the non-woven fabric, it is a heat-sealing composite fiber of core-sheath type (core: polyethylene terephthalate (PET), sheath: polyethylene (PE)) with a fineness of 2.3 dtex and a fiber length of 51 mm, and the core portion is covered with a core-sheath type composite fiber. The one containing titanium dioxide was used. The heat-sealing core-sheath type composite fiber was not colored and was white.
As the fiber treatment agent, one having the following composition was used. The prepared heat-sealing core-sheath type composite fiber was immersed in the fiber treatment agent and dried to obtain a heat-sealing core-sheath type composite fiber to which the fiber treatment agent was attached. The amount of the fiber treatment agent attached to the total mass of the obtained fibers was 0.44% by mass. Further, the content of titanium dioxide in the fiber was 3% by mass with respect to the total mass of the obtained fiber.

(Ingredient composition of fiber treatment agent)
・ Dispersant: 3.0% by mass
・ Water: 42.1% by mass
-Dialkylsulfosuccinate potassium salt: 5.5% by mass
-Polyoxyethylene, polyoxypropylene, modified silicone [manufactured by Shin-Etsu Chemical Co., Ltd., X-22-4515]: 11.0% by mass
-Stealyll phosphate sodium salt as the main component: 13.7% by mass
-Alkyl (stearyl) betaine as the main component: 8.3% by mass
-Polyoxyethylene as the main component (number of moles added: 2) Stearyl amide: 16.4% by mass
In the preparation of the fiber treatment agent, a "fatty acid compound" produced from a raw material made of a vegetable fat or oil containing no animal fat or oil was mixed. This "fatty acid compound" is a "fatty acid saturated fatty acid having no double bond" of stearyl phosphate sodium salt, alkyl (stearyl) betaine, and polyoxyethylene (additional number of moles: 2) stearylamide as main components, respectively. It contained "compounds". The fatty acids containing stearic acid, which is the raw material of the above fatty acid compounds, include 0.2% by mass of myristic acid, 27.8% by mass of palmitic acid, 71.2% by mass of stearic acid, and 0.6% by mass of arachidic acid. A substance consisting of 0.2% by mass of monounsaturated fatty acid having 18 carbon atoms was used. The "aliphatic saturated fatty acid compound having no double bond" was a compound with myristic acid, palmitic acid, stearic acid, and arachidic acid, respectively, and the total amount was 99.8% by mass. The "unsaturated fatty acid compound" was a compound with a mono-unsaturated fatty acid having 18 carbon atoms, and the total amount was 0.2% by mass.
The mass ratio (B / A × 100) of the content (B) of the unsaturated fatty acid compound to the content (A) of the aliphatic saturated fatty acid compound having no double bond in the fiber treatment agent is 0.2. It was% by mass.

Using the heat-bondable core-sheath type composite fiber to which the obtained fiber treatment agent was attached as raw cotton, a non-woven fabric having a basis weight of 18 g / m ² was produced by an air-through method. This non-woven fabric was used as a non-woven fabric sample for absorbent articles of Example 1. Also in the non-woven sample, the mass ratio (B / A × 100) of the content (B) of the unsaturated fatty acid compound to the content (A) of the aliphatic saturated fatty acid compound having no double bond is 0. It was 2% by mass. The obtained non-woven fabric was not colored and was white.

(Example 2)
A sample of the non-woven fabric for absorbent articles of Example 2 was prepared in the same manner as in Example 1 except that the content of titanium dioxide in the fiber was 0.2% by mass with respect to the total mass of the fiber.

(Comparative Example 1)
A non-woven fabric sample for an absorbent article of Comparative Example 1 was prepared in the same manner as in Example 1 except that a fatty acid compound was prepared from a raw material made of animal fat (beef tallow, lard) and mixed with a fiber treatment agent. ..
The raw materials for the fatty acid compounds are 0.4% by mass of myristic acid, 0.1% by mass of pentadecanoic acid, 28.9% by mass of palmitic acid, 1.3% by mass of margaric acid, 61.3% by mass of stearic acid, and nonadecil. 0.2% by mass of acid, 1.2% by mass of arachidic acid, 0.1% by mass of henicosyl acid, 0.6% by mass of behenic acid, 0.1% by mass of tricosyl acid, 0.2% by mass of lignoseric acid, 15 carbon atoms Mono-unsaturated fatty acid 0.6% by mass, mono-unsaturated fatty acid with 16 carbons 0.6% by mass, mono-unsaturated fatty acid with 17 carbons 1.7% by mass, di-unsaturated fatty acid with 17 carbons 1.1 It was composed of% by mass, 0.5% by mass of monounsaturated fatty acid having 18 carbon atoms, 0.5% by mass of monounsaturated fatty acid having 19 carbon atoms, and 0.6% by mass of diunsaturated fatty acid having 19 carbon atoms. .. Of these, "aliphatic saturated fatty acids without double bonds" include myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, nonadesyl acid, arachidic acid, henicosylic acid, behenic acid, tricosyl acid, and lignoceric acid. The total was 94.4% by mass. The "unsaturated fatty acid" includes a monounsaturated fatty acid having 15 carbon atoms, a monounsaturated fatty acid having 16 carbon atoms, a monounsaturated fatty acid having 17 carbon atoms, a diunsaturated fatty acid having 17 carbon atoms, and a monounsaturated fatty acid having 18 carbon atoms. It was composed of a fatty acid, a monounsaturated fatty acid having 19 carbon atoms, and a di-unsaturated fatty acid having 19 carbon atoms, and the total amount was 5.6% by mass.
The "aliphatic saturated fatty acid compounds having no double bond" were each a compound with the above-mentioned "aliphatic saturated fatty acid having no double bond", and the total amount was 94.4% by mass. Further, each of the "unsaturated fatty acid compounds" was a compound with the above-mentioned "unsaturated fatty acid", and the total amount was 5.6% by mass.
At this time, the mass ratio (B / A ×) of the content (B) of the unsaturated fatty acid compound to the content (A) of the aliphatic saturated fatty acid compound having no double bond in the fiber treatment agent and the non-woven fabric sample. 100) was 5.9% by mass.

(Comparative Example 2)
A sample of the non-woven fabric for absorbent articles of Comparative Example 1 was prepared in the same manner as in Example 2 except that the same fatty acid as in Comparative Example 1 was desired to be used.

(Example 3)
Linear low density polyethylene (LLDPE) was used as a raw material for the film. As shown below, calcium carbonate, a fatty acid and a fatty acid compound were mixed with the linear low-density polyethylene (the following mass% is the total mass of the entire linear low-density film after molding. The mass ratio to is shown.). The aliphatic saturated fatty acid having no double bond is used as a component for promoting the dispersion of the inorganic filler (calcium carbonate), and the aliphatic saturated fatty acid compound having no double bond is used as a component for promoting the pore opening of the film. board.
(i) Calcium carbonate particle size 1 μm 53% by mass
(ii) Fatty acids and fatty acid compounds produced from raw materials made of vegetable fats and oils that do not contain animal fats and oils ・ Fatty acids containing stearic acid as the main component 1% by mass
・ Fatty acid compound containing stearic acid as the main component 4% by mass
The above-mentioned "fatty acid containing stearic acid as a main component" is a mixture containing stearic acid as a main component, and the mixture is 0.2% by mass of myristic acid, 27.5% by mass of palmitic acid, 71.4% by mass of stearic acid, and arachidic acid. It consisted of 0.7% by mass of acid and 0.2% by mass of monounsaturated fatty acid having 18 carbon atoms. Of these, the "aliphatic saturated fatty acid having no double bond" was composed of myristic acid, palmitic acid, stearic acid, and arachidic acid, and the total amount was 99.8% by mass. The "unsaturated fatty acid" consisted of 0.2% by mass of monounsaturated fatty acid having 18 carbon atoms.
The above-mentioned "fatty acid compound containing stearic acid as a main component" is a compound of the above-mentioned "fatty acid" and the following alcohol. It is composed of% by mass, 72.4% by mass of stearyl alcohol, 0.5% by mass of arachidyl alcohol, and 0.2% by mass of an alcohol having 18 carbon atoms having one double bond as an unsaturated aliphatic alcohol, and is a fatty acid compound. Was an ester compound containing stearyl stearate as a main component, which consisted of each combination. Of these, the "aliphatic saturated fatty acid compound having no double bond" is an ester of the "aliphatic saturated fatty acid having no double bond" and the "saturated fatty alcohol", and the total amount thereof is 99. It was 0.6% by mass. The "unsaturated fatty acid compound" is an ester of the "unsaturated fatty acid" and the "saturated fatty alcohol", an ester of the "saturated fatty acid" and the "unsaturated fatty alcohol", or the "unsaturated fatty acid". And the above-mentioned "unsaturated fatty acid alcohol", and the total amount thereof was 0.4% by mass.
The total amount of "aliphatic saturated fatty acid without double bond" and "aliphatic saturated fatty acid compound without double bond" as a whole is 99.6% by mass, and "unsaturated fatty acid" and "unsaturated fatty acid" The total amount of "unsaturated fatty acid compound" was 0.4% by mass.
The content of the unsaturated fatty acid and the unsaturated fatty acid compound (B) with respect to the content (A) of the aliphatic saturated fatty acid having no double bond and the aliphatic saturated fatty acid compound having no double bond in the film. The mass ratio (B / A × 100) was 0.4% by mass.
Next, the mixture as described above was melt-kneaded, injection-molded into a sheet, and uniaxially stretched at a draw ratio of 2.7 times. As a result, a sample of the film for absorbent articles of Example 3 was obtained. The basis weight of the obtained sample was 18 g / m ² . The obtained film was not colored and was white.

(Example 4)
A sample of the film for an absorbent article of Example 4 was prepared in the same manner as in Example 3 except that the draw ratio was 2.0 times and the calcium carbonate was 37% by mass.

(Comparative Example 3)
A sample of the film for absorbent articles of Comparative Example 3 was prepared in the same manner as in Example 3 except that fatty acids and fatty acid compounds were prepared from raw materials made of animal fats and oils (beef tallow, lard) and mixed with the film raw materials. Made.
The above-mentioned "fatty acid" is a mixture containing stearic acid as a main component, and the mixture is 0.5% by mass of myristic acid, 0.1% by mass of pentadecanoic acid, 28.6% by mass of palmitic acid, 1.2% by mass of margaric acid, 64.4% by mass of stearate, 0.2% by mass of nonadesilic acid, 1.3% by mass of arachidic acid, 0.1% by mass of henicosyl acid, 0.5% by mass of behenic acid, 0.1% by mass of tricosyl acid, lignoseric acid 0.2% by mass, monounsaturated fatty acid with 15 carbon atoms 0.3% by mass, monounsaturated fatty acid with 16 carbon atoms 0.3% by mass, monounsaturated fatty acid with 17 carbon atoms 0.8% by mass, carbon number 17 di-unsaturated fatty acids 0.6% by mass, 18-carbon mono-unsaturated fatty acids 0.3% by mass, 19-carbon mono-unsaturated fatty acids 0.2% by mass, 19-carbon di-unsaturated fatty acids 0. It consisted of 3% by mass. Of these, "aliphatic saturated fatty acids without double bonds" include myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, nonadesyl acid, arachidic acid, henicosylic acid, behenic acid, tricosyl acid, and lignoceric acid. The total was 97.2% by mass. The "unsaturated fatty acid" includes a monounsaturated fatty acid having 15 carbon atoms, a monounsaturated fatty acid having 16 carbon atoms, a monounsaturated fatty acid having 17 carbon atoms, a diunsaturated fatty acid having 17 carbon atoms, and a monounsaturated fatty acid having 18 carbon atoms. It was composed of a fatty acid, a monounsaturated fatty acid having 19 carbon atoms, and a di-unsaturated fatty acid having 19 carbon atoms, and the total amount was 2.8% by mass.
The above-mentioned "fatty acid compound" is a compound of the above-mentioned "fatty acid" and the following alcohol, and the alcohol is a saturated aliphatic alcohol of 0.1% by mass of myristyl alcohol, 0.1% by mass of pentadecyl alcohol, and palmityl alcohol 25. 8% by mass, 1-heptadecanol 1.2% by mass, stearyl alcohol 68.1% by mass, nonadecyl alcohol 0.2% by mass, arachidyl alcohol 1.2% by mass, heneicosanol 0.1% by mass , Behenyl alcohol 0.5% by mass, Elsyl alcohol 0.1% by mass, Lignoceryl alcohol 0.2% by mass, and as unsaturated aliphatic alcohol, alcohol with 15 carbon atoms having one double bond 0.3 Mass%, alcohol with 16 carbon atoms with one double bond 0.3 mass%, alcohol with 17 carbon atoms with one double bond 0.7 mass%, carbon number 17 with two double bonds 0.5% by mass of alcohol, 0.2% by mass of alcohol with 18 carbon atoms having one double bond, 0.2% by mass of alcohol with 19 carbon atoms having one double bond, and two double bonds. The alcohol compound having 19 carbon atoms was 0.2% by mass, and the fatty acid compound was an ester compound containing stearyl stearate as a main component composed of each combination. Of these, the "aliphatic saturated fatty acid compound having no double bond" is an ester of the "aliphatic saturated fatty acid having no double bond" and the "saturated fatty alcohol", and the total amount thereof is 94. It was 0.7% by mass. The "unsaturated fatty acid compound" is an ester of the "unsaturated fatty acid" and the "saturated aliphatic alcohol", an ester of the "saturated fatty acid" and the "unsaturated fatty acid", or the "unsaturated fatty acid". And the above-mentioned "unsaturated fatty acid", and the total amount thereof was 5.3% by mass.
The total amount of "aliphatic saturated fatty acid without double bond" and "aliphatic saturated fatty acid compound without double bond" as a whole is 95.2% by mass, and "unsaturated fatty acid" and "unsaturated fatty acid" The total amount of "unsaturated fatty acid compound" was 4.8% by mass.
The content of the unsaturated fatty acid and the unsaturated fatty acid compound (B) with respect to the content (A) of the aliphatic saturated fatty acid having no double bond and the aliphatic saturated fatty acid compound having no double bond in the film. The mass ratio (B / A × 100) was 5.0 mass%.

(Comparative Example 4)
A sample of the non-woven fabric for absorbent articles of Comparative Example 4 was prepared in the same manner as in Example 4 except that the same fatty acid and fatty acid compound as in Comparative Example 3 were desired to be used.

(test)
The following tests were performed on each of the obtained samples.

(1) Sheet b value With respect to the obtained nonwoven fabric and film, the sheet b value (hunter Lab system b value) was measured using a colorimeter (trade name: Labscan XE, manufactured by HunterLab). The non-woven fabric and the film were measured by stacking 64 sheets each without being affected by the color of the base. The smaller the sheet b value, the higher the whiteness, and the lower the sheet b value, the lower the saturation of yellowness, and it is judged that there is no more "yellowing".

(2) Diaper sensory evaluation test Using the non-woven fabric samples of Examples 1 and 2 and Comparative Examples 1 and 2 as the surface sheet of the diaper, Kao Corporation's diaper "Mary's Sarasara Air Through M size" (trade name, made in 2018) It was replaced with a surface sheet and joined. These were used as diaper samples of Examples 1 and 2 and Comparative Examples 1 and 2, respectively.
The film samples of Examples 3 and 4 and Comparative Examples 3 and 4 were used as the back sheet of the diaper, and were replaced with the back sheet of the diaper "Mary's Sarasara Air Through M size" (trade name, made in 2018) manufactured by Kao Corporation and joined. .. These were used as diaper samples of Examples 3 and 4, and Comparative Examples 3 and 4, respectively.
The yellowing of the diapers obtained above was evaluated as follows.
First, samples A to C, which serve as criteria for evaluation, were prepared by the following method. Specifically, during the production of the film of Example 3, the stretch ratio is adjusted (the b value decreases when the film is stretched significantly), and calcium carbonate is produced as a raw material in different mines. By properly using different calcium carbonates (increasing the b value and appropriately replacing the calcium carbonate in the mine), the following three types of films having different b values were obtained (Samples A to C). The b values of the samples A to C were measured by the same method as in the above-mentioned (1) Sheet b value test.
Sample A: b value = 0.5
Sample B: b value = 0.8
Sample C: b value = 1.1
Next, sample A was set to 5 points, sample B was set to 3 points, and sample C was set to 0 points. Based on these, 10 panels (late 20s to late 40s) visually observed each example and each comparative example. The degree of yellowing of the diaper sample (yellowing of the front sheet and back sheet) was judged. The evaluation points of each panel were averaged and used as the sensory evaluation points of each sample.
5 points: Pure white 4 points: Not pure white but does not feel yellow 3 points: Slightly yellowish 2 points: Yellowish 1 point: Yellowishness that leads to yellowing 0 points: Yellowishness is felt (this evaluation) "Yellowness" in the above means that the coloring to the extent that the yellow color can be slightly recognized can be visually confirmed, and "yellowness" means a deep yellowness (saturation) so that the sample is recognized as deteriorated. High) coloring can be visually confirmed.)

(3) Preservation evaluation test The obtained nonwoven fabric / film was stored in a bag filled with a gas containing 200 ppm of nitrogen (N ₂ ) (1 week, temperature: 40 ° C.).
The evaluation was made by visually comparing the non-woven fabric / film before storage with the non-woven fabric / film after storage.

As shown in Table 1, in Example 1, the sheet b value was lower and the yellowness was lower than that of Comparative Example 1 in which the content of titanium dioxide imparting whiteness was the same. In the diaper sensory evaluation test, Comparative Example 1 was evaluated as "2" and yellowish, whereas Example 1 was evaluated as "4" and did not feel yellow and had a high degree of whiteness. Recognized.
Further, similar results were obtained in the comparison between Example 2 and Comparative Example 2 in which the content of titanium dioxide was lower than that of Example 1 and Comparative Example 1. That is, in Example 2, the sheet b value was lower and the yellowness was lower than that of Comparative Example 2. In the diaper sensory evaluation test, Comparative Example 2 was evaluated as "1" and was found to feel yellowing leading to yellowing, whereas Example 2 was evaluated as "2" and was evaluated as yellowing leading to yellowing. I didn't feel it.

As shown in Table 2, in Example 3, the sheet b value is lower and the yellowness is lower than that of Comparative Example 3 in which the content of the inorganic filler and the draw ratio are the same and the pore area ratio is the same. It was a good one. In the diaper sensory evaluation test, Comparative Example 3 was evaluated to be slightly yellowish with an evaluation of "3", whereas Example 3 was recognized to be pure white with an evaluation of "5".
Further, similar results were obtained in the comparison between Example 4 and Comparative Example 4, in which the content of the inorganic filler was smaller than that in Example 3 and Comparative Example 3 and the pore area ratio was small. That is, in Example 4, the sheet b value was lower and the yellowness was lower than that of Comparative Example 4. In the diaper sensory evaluation test, Comparative Example 4 was evaluated to have a yellowish color with an evaluation of "2", whereas Example 4 had an evaluation of "3" and had a slight yellowness. Did not feel yellowish.

Further, in the storage evaluation for one week, yellowing occurred in Comparative Examples 1 to 4, whereas all of Examples 1 to 4 did not generate yellowing and no change in the degree of whiteness was observed.

From the above, it can be seen that the non-woven fabric for absorbent articles and the film for absorbent articles of the present invention have less yellowing and suppress yellowing with time. As a result, the whiteness of the non-woven fabric for absorbent articles of the present invention is enhanced, and the viewer is given the impression that the non-woven fabric is of good quality with little deterioration.

Claims (9)

A non-woven fabric having a fiber treatment agent, wherein the fiber treatment agent contains an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond, and the double bond is formed. The mass ratio (B /) of the total content (B) of the unsaturated fatty acid and the unsaturated fatty acid compound to the total content (A) of the aliphatic saturated fatty acid having no fatty acid and the aliphatic saturated fatty acid compound having no double bond. A non-fatty acid for absorbent articles having A × 100) of 1.5% by mass or less. The nonwoven fabric for absorbent articles according to claim 1, wherein the fibers constituting the nonwoven fabric contain a color tone changing agent, and the content of the color tone changing agent in the fibers is 1% by mass or more with respect to the total mass of the fibers. .. The nonwoven fabric for absorbent articles according to claim 1 or 2, wherein the nonwoven fabric contains fibers having a fineness of 3 dtex or less. A film containing an aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond, the aliphatic saturated fatty acid having no double bond and a double bond. The mass ratio (B / A × 100) of the total content (B) of the unsaturated fatty acid and the unsaturated fatty acid compound to the total content (A) of the aliphatic saturated fatty acid compound having no The following film for absorbent articles. The film for an absorbent article according to claim 4, which contains 40% by mass or more of an inorganic filler with respect to the total mass of the film. The film for an absorbent article according to claim 4 or 5, wherein the pore area ratio is 2.5% or more. An absorbent article having the nonwoven fabric according to any one of claims 1 to 3 or the film for an absorbent article according to any one of claims 4 to 6. An aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond is produced from a raw material made of a vegetable fat or oil that does not contain animal fat and oil, and has the double bond. A fiber treatment agent containing a non-aliphatic saturated fatty acid and / or an aliphatic saturated fatty acid compound having no double bond is prepared, and the fiber treatment agent is attached to the fiber to form a non-woven fabric having the fiber. A method for producing an absorbent article, which comprises a step of incorporating a non-fatty acid. An aliphatic saturated fatty acid having no double bond and / or an aliphatic saturated fatty acid compound having no double bond is produced from a raw material made of a vegetable fat or oil that does not contain animal fat or oil, and has the double bond. An absorbent article comprising the steps of melt-mixing a non-aliphatic saturated fatty acid and / or a non-double-bonded aliphatic saturated fatty acid compound with a thermoplastic resin to form a film from the melt mixture and incorporating the film. Production method.