JP2005187515A - Dispersion of globular polyester resin particle for adhering nonwoven fabric and globular polyester resin particle for adhering nonwovwn fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dispersion of a globular polyester resin particle for adhering a nonwoven fabric, having excellent adhesion, water resistance and solvent resistance, and to provide a globular polyester resin particle for adhering a nonwoven fabric. <P>SOLUTION: The dispersion of the globular polyester resin particle for adhering the nonwoven fabric is a water dispersion of a globular resin particle that contains as the essential component a resin formed by neutralizing part or the whole of the carboxy group in a crystalline polyester resin (A) containing an alkyl group and/or an alkenyl group and a carboxy group. The globular polyester resin particle for adhering the nonwoven fabric is a globular resin particle that contains as the essential component a crystalline polyester resin (A) containing an alkyl group and/or an alkenyl group and a carboxy group, or one that contains as the essential component a resin formed by neutralizing part or the whole of the carboxy group in the polyester resin (A) with a basic compound. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a non-woven fabric adhesive spherical polyester resin particle dispersion and non-woven fabric adhesive spherical polyester resin particles having excellent adhesive strength, water resistance, and solvent resistance.

  Some non-woven fabrics can be designed to be soft and supple, and others can be hard and tough, depending on the purpose and application. Therefore, clothing materials such as adhesive interlining, artificial leather, insulating materials for printed wiring boards, separator materials for rechargeable batteries, automotive interior materials, air conditioning filters, industrial filter media, copier cleaning materials, medical products It is widely used in various fields ranging from daily necessities such as patch fabrics and sanitary materials to advanced materials.

As an adhesive used for processing such a nonwoven fabric, for example, a thermoplastic resin is heated to a temperature equal to or higher than the softening point of the resin, and an aqueous thermoplastic resin dispersion obtained in an aqueous medium in a softened state is heat-melted. A technique used as a wearing adhesive is known (for example, see Patent Document 1). However, the adhesive for heat fusion does not have sufficient adhesive strength, water resistance and solvent resistance.
JP 2001-19937 (page 2, pages 5-7)

  An object of the present invention is a spherical polyester resin particle dispersion for bonding nonwoven fabrics and spherical polyester resin particles for bonding nonwoven fabrics, which has excellent adhesive strength, water resistance and solvent resistance and can be suitably used as an adhesive for bonding nonwoven fabrics. Is to provide.

  As a result of intensive studies to solve the above problems, the inventors of the present invention contain an alkyl group having 4 to 20 carbon atoms and / or an alkenyl group and a carboxyl group having 4 to 20 carbon atoms, and a differential scanning calorimeter. Obtained by using a crystalline polyester resin having a heat of crystal fusion of 3 to 50 J / g and a weight average molecular weight (Mw) of 20,000 to 150,000 by gel permeation chromatography (GPC). Spherical polyester resin particles obtained by drying the aqueous dispersion of spherical polyester resin particles and the aqueous dispersion of the polyester resin particles have excellent adhesion, water resistance, solvent resistance, etc., and are non-woven fabrics. The present invention has been completed by finding out that it can be preferably used as an adhesive for use.

  That is, the present invention contains an alkyl group having 4 to 20 carbon atoms and / or an alkenyl group and a carboxyl group having 4 to 20 carbon atoms, and has a heat of crystal melting by a differential scanning calorimeter of 3 to 50 J / g. In addition, some or all of the carboxyl groups in the crystalline polyester resin (A) having a weight average molecular weight (Mw) of 20,000 to 150,000 by gel permeation chromatography (GPC) method are neutralized. The present invention provides a spherical polyester resin particle dispersion for bonding nonwoven fabric, which is an aqueous dispersion of spherical resin particles containing the resin as an essential component.

  Further, the present invention contains an alkyl group having 4 to 20 carbon atoms and / or an alkenyl group and a carboxyl group having 4 to 20 carbon atoms, and has a heat of crystal melting by a differential scanning calorimeter of 3 to 50 J / g, And a spherical resin particle containing, as an essential component, a crystalline polyester resin (A) having a weight average molecular weight (Mw) of 20,000 to 150,000 as determined by gel permeation chromatography (GPC), or Provided is a spherical polyester resin particle for bonding nonwoven fabric characterized in that it is a spherical resin particle containing, as an essential component, a resin obtained by neutralizing a part or all of the carboxyl groups in the polyester resin (A) with a basic compound. To do.

  Adhesion with strong adhesive strength and excellent water resistance and solvent resistance by using the non-woven fabric adhesive spherical polyester resin particle dispersion or non-woven fabric adhesive spherical polyester resin particle of the present invention as a heat-bonding adhesive for non-woven fabric adhesion The surface can be obtained and the improvement of the performance of various nonwoven fabric products can be expected.

The present invention is described in detail below.
The crystalline polyester resin (A) containing an alkyl group having 4 to 20 carbon atoms and / or an alkenyl group having 4 to 20 carbon atoms and a carboxyl group used in the present invention is, for example,
1. Of the dibasic acid and the divalent alcohol, the component having a crystalline component, and the component having an alkyl group having 4 to 20 carbon atoms or an alkenyl group having 4 to 20 carbon atoms, preferably have 4 to 20 carbon atoms. Essentially a dibasic acid having an alkyl group or an alkenyl group having 4 to 20 carbon atoms, if necessary, other dibasic acids and anhydrides thereof, trifunctional or more polybasic acids and anhydrides thereof, monobasic acids, A method of mixing other dihydric alcohols, trifunctional or higher alcohols, monohydric alcohols, etc., and dehydrating and condensing while measuring the acid value under heating in a nitrogen atmosphere,
2. A crystalline polyester resin having a carboxyl group at the end (which may contain a carboxyl group in the main chain) is heated and melted, and then an alkyl group having 4 to 20 carbon atoms or an alkenyl having 4 to 20 carbon atoms. A method of introducing an aliphatic monoepoxy compound having a group and ring-opening addition to a part of the terminal carboxyl group of the polyester resin,
3. A carboxyl group-containing crystalline polyester resin having a hydroxyl group at the terminal is dissolved by heating, and an acid anhydride having an alkyl group having 4 to 20 carbon atoms or an alkenyl group having 4 to 20 carbon atoms is added thereto, A method of ring-opening addition to a terminal hydroxyl group,
It can be obtained by a preparation method such as

  Examples of the alkyl group having 4 to 20 carbon atoms and the alkenyl group having 4 to 20 carbon atoms that the crystalline polyester resin (A) has include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, and isobutyl. Group, sec-butyl group, tert-butyl group, pentyl group, hexyl group, octyl group, nonyl group, isononyl group, dodecyl group, dodecenyl group and the like.

  Examples of the dibasic acid serving as the crystalline component include aromatic dibasic acids such as terephthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid, and aliphatic dibasic acids such as adipic acid and azelaic acid. Can be mentioned. Examples of the divalent alcohol used as the crystal component include ethylene glycol, 1,4-butanediol, 1,3-propanediol, 1,5-pentanediol, 1,6-hexanediol, and diethylene glycol. And aliphatic diols such as triethylene glycol and polyethylene glycol. As the crystalline component, both basic acid and alcohol may be used, or one of them may be used.

  In the crystalline polyester resin (A), 65 to 100 mol%, preferably 80 to 100 mol% of the acid component is terephthalic acid, and 70 to 100 mol%, preferably 80 to 100 mol% of the alcohol component. Is a crystalline polyester resin in which 1,5-pentanediol is used, a non-woven fabric adhesive spherical polyester resin particle dispersion and non-woven fabric adhesive spherical polyester resin particle having both excellent adhesive strength, water resistance, and solvent resistance. Since it is obtained, it is preferable.

  Examples of the dibasic acid having an alkyl group having 4 to 20 carbon atoms or an alkenyl group having 4 to 20 carbon atoms include n-butyl succinic acid, n-octyl succinic acid, n-dodecyl succinic acid, and n-dodecenyl succinic acid. Examples thereof include dibasic acids such as acids and anhydrides thereof.

  Examples of other dibasic acids and anhydrides used as necessary include maleic acid, fumaric acid, itaconic acid, oxalic acid, malonic acid, succinic acid, sebacic acid, decane-1,10- Aliphatic dibasic acids such as dicarboxylic acids; phthalic acid, tetrahydrophthalic acid and its anhydride, hexahydrophthalic acid and its anhydride, tetrabromophthalic acid and its anhydride, tetrachlorophthalic acid and its anhydride, het acid And aromatic or alicyclic dibasic acid such as isophthalic acid and cyclohexanedicarboxylic acid, etc.

  Examples of the tribasic or higher polybasic acid and anhydride thereof include trimellitic acid, trimellitic anhydride, methylcyclohexeric carboxylic acid, methylcyclohexeric carboxylic anhydride, and pyromellitic acid.

  Examples of the monobasic acid include benzoic acid and p-tert-butylbenzoic acid.

  Examples of other dihydric alcohols used as necessary include aliphatic diols such as 1,2-propylene glycol, dipropylene glycol and neopentyl glycol; bisphenol A Bisphenols such as bisphenol F; bisphenol A alkylene oxide adducts such as bisphenol A ethylene oxide adduct, bisphenol A propylene oxide adducts; xylylene glycol, cyclohexane di Examples thereof include aralkylene glycols such as methanol and hydrogenated bisphenol A, and alicyclic diols.

  Examples of the trifunctional or higher polyhydric alcohol include glycerin, trimethylolethane, trimethylolpropane, sorbitol, 1,2,3,6-hexanetetrol, 1,4-sorbitan, and pentaerythritol. And dipentaerythritol, 2-methylpropanetriol, 1,3,5-trihydroxybenzene, tris (2-hydroxyethyl) isocyanurate and the like.

  Moreover, the polyepoxy compound as shown below is also mentioned as a polyhydric alcohol more than trifunctional. For example, polyglycidyl ethers of various aliphatic or alicyclic polyols such as ethylene glycol, hexanediol, neopentyl glycol, trimethylolpropane, trimethylolethane, glycerin, pentaerythritol, sorbitol, hydrogenated bisphenol A;

Polyglycidyl ethers of compounds containing two phenolic hydroxyl groups such as hydroquinone, catechol, resorcin, bisphenol A, bisphenol S, bisphenol F, etc .; compounds containing two of the above-mentioned phenolic hydroxyl groups Diglycidyl ethers of derivatives of ethylene oxide or propylene oxide adducts of

Polyglycidyl ethers of various polyether polyols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol; polyglycidyl ethers of tris (2-hydroxyethyl) isocyanurate; adipic acid, butanetetracarboxylic acid, propanetricarboxylic acid Polyglycidyl esters of various aliphatic or aromatic polycarboxylic acids such as acid, phthalic acid, terephthalic acid, trimellitic acid;

Bisepoxides of various hydrocarbon-based dienes such as butadiene, hexadiene, octadiene, dodecadiene, cyclooctadiene, α-pinene, vinylcyclohexene; bis (3,4-epoxycyclohexylmethyl) adipate, 3,4-epoxycyclohexylmethyl And various alicyclic polyepoxy compounds such as -3,4-epoxycyclohexylcarboxylate; epoxidized products of various diene polymers such as polybutadiene and polyisoprene; and the like.

  Examples of the monohydric alcohol include higher alcohols such as stearyl alcohol.

  The manufacturing method 2. Examples of the aliphatic monoepoxy compound having an alkyl group having 4 to 20 carbon atoms or an alkenyl group having 4 to 20 carbon atoms to be used in castor oil fatty acid, coconut oil fatty acid, soybean oil fatty acid, tung oil fatty acid, etc. And monoglycidyl esters of various saturated or unsaturated fatty acids, and monoglycidyl esters of branched fatty acids such as Cardura E10 (manufactured by Shell Chemical Co., Ltd.), isononanoic acid and versatic acid.

  2. Production method 3 above. Examples of the acid anhydride having an alkyl group having 4 to 20 carbon atoms or an alkenyl group having 4 to 20 carbon atoms used in the above include, for example, n-butyl succinic anhydride, n-pentyl succinic anhydride, neopentyl succinic anhydride. Acid, n-hexyl succinic anhydride, n-heptyl succinic anhydride, n-octyl succinic anhydride, isooctyl succinic anhydride, 2-ethylhexyl succinic anhydride, n-dodecyl succinic acid, n-dodecyl succinic anhydride, isododecyl anhydride Succinic acid, n-dodecenyl succinic acid, n-dodecenyl succinic anhydride, isododecenyl succinic anhydride, 6-butyl-1,2,4-benzenetricarboxylic anhydride, 6-n-octyl-1,2,4-benzenetricarboxylic acid An acid anhydride etc. are mentioned. Of these, n-dodecenyl succinic anhydride is preferable.

  The aforementioned dibasic acid, its anhydride, trifunctional or higher polybasic acid, its anhydride, and monobasic acid may be used alone or in combination of two or more. Further, those in which a part or all of the carboxyl groups are alkyl esters, alkenyl esters or aryl esters can also be used.

  Further, the above-described dihydric alcohol, trifunctional or higher polyhydric alcohol, and monohydric alcohol may be used alone or in combination of two or more.

  Furthermore, for example, compounds having both a hydroxyl group and a carboxyl group in one molecule such as dimethylolpropionic acid, dimethylolbutanoic acid, 6-hydroxyhexanoic acid, or reactive derivatives thereof can be used.

  The crystalline polyester resin (A) is prepared by a preparation method 2. Aliphatic monoepoxy having an alkyl group having 4 to 20 carbon atoms and / or an alkenyl group having 4 to 20 carbon atoms at the terminal carboxyl group of the crystalline polyester resin (a2) having a carboxyl group at the terminal obtained by 2. Polyester resin (A2) having a terminal structure formed by ring-opening addition of a compound, or preparation method 3. The acid anhydride having an alkyl group having 4 to 20 carbon atoms and / or an alkenyl group having 4 to 20 carbon atoms is opened at the terminal hydroxyl group of the crystalline polyester resin (a3) having a hydroxyl group at the terminal obtained by If it is a polyester resin (A3) having a terminal structure obtained by addition, it is preferable because the dispersion of the resin particles in the aqueous medium is good, and among them, the dispersibility in the aqueous medium is good, Polyester resin (A3) is particularly preferred because of better adhesion, water resistance and solvent resistance. The crystalline polyester resin (a2) and the crystalline polyester resin (a3) used at this time may or may not already contain an alkyl group or alkenyl group.

  The crystalline polyester resin (A) may contain the terminal structure of the polyester resin (A2) and the terminal structure of the polyester resin (A3), respectively, in one molecule of the polyester resin, or these terminal structures. You may have both.

  Of the polyester resins (A2), a polyester resin having a terminal structure represented by the following general formula (1) and / or (2) is more preferable.

（式中のＲは、炭素原子数４〜２０のアルキル基または炭素原子数４〜２０のアルケニル基を表す。）

(R in the formula represents an alkyl group having 4 to 20 carbon atoms or an alkenyl group having 4 to 20 carbon atoms.)

  The alkyl group having 4 to 20 carbon atoms and the alkenyl group having 4 to 20 carbon atoms in the general formulas (1) and (2) may be linear or branched. For example, butyl group, isobutyl group, pentyl Group, neopentyl group, hexyl group, peptyl group, octyl group, isooctyl group, dodecyl group, dodecenyl group and the like.

  As an apparatus used in the preparation method described above, a batch-type manufacturing apparatus such as a reaction vessel equipped with a nitrogen inlet, a thermometer, a stirring device, a rectifying tower, etc. can be suitably used, and a deaeration port is provided. An extruder, a continuous reaction apparatus, a kneader, or the like can also be used. In the dehydration condensation, the esterification reaction can be accelerated by reducing the pressure of the reaction system as necessary. Furthermore, various catalysts can also be added to accelerate the esterification reaction.

  Preparation method 3. When the polyester resin (A2) is prepared by the above method, it is necessary to carry out the ring-opening addition reaction under the condition that the carboxyl group generated by the ring opening of the acid anhydride does not undergo the dehydration condensation reaction with other hydroxyl groups. There are no particular limitations on the conditions for the ring-opening addition reaction that does not cause water vaporization. For example, the temperature of the ring-opening addition reaction is lowered from about 240 ° C. at which dehydration occurs to about 200 ° C. If an inert gas such as nitrogen gas is introduced into the reaction system, minimize the amount. If dehydration condensation is performed by performing a vacuum reaction, stop the vacuum reaction. However, a method such as returning to a normal pressure reaction is common.

Next, the properties of the crystalline polyester resin (A) will be described.
The crystalline polyester resin (A) needs to have a weight average molecular weight (Mw) by the GPC method of 20,000 to 150,000. If it is less than 20,000, the adhesive strength is not sufficient, which is not preferable. If it is larger than 150,000, the wettability with the adherend is not good, and the adhesiveness, water resistance and solvent resistance are not sufficient, which is not preferable. The weight average molecular weight of the crystalline polyester resin (A) is more preferably 25,000 to 150,000.

  When the resin melt (I) containing the crystalline polyester resin (A) as an essential component is used as an aqueous dispersion, the polyester resin (A) is a base in order to improve the dispersibility in an aqueous medium. The acid value of the polyester resin (A) is preferably in the range of 5 to 140 mgKOH / g, particularly 6 to 100 mgKOH / g. It is particularly preferable that the range is

  Also, the hydroxyl value of the crystalline polyester resin (A) is preferably in the range of 5 to 100 mgKOH / g, particularly 7 to 70 mgKOH / g in order to improve the dispersibility in the aqueous medium. A range is particularly preferred.

  The crystalline polyester resin (A) needs to have a heat of crystal melting by a differential scanning calorimeter (hereinafter abbreviated as “DSC”) of 3 to 50 J / g. If the amount of heat of crystal fusion is less than 3 J / g or more than 50 J / g, it is not preferable because resin particles excellent in adhesion, water resistance and solvent resistance cannot be obtained. The amount of heat of crystal melting is more preferably in the range of 10 to 40 J / g. In the present invention, the heat of crystal fusion is measured by raising the temperature of the polyester resin to 240 ° C. and then dissolving 500 mg of the dissolved resin in a tin can having a diameter of 11 cm and a height of 13 cm at 25 ° C. The measurement was carried out by measuring three samples taken at random by crushing the resin left for a week, and determining the average value.

  The glass transition temperature by DSC (hereinafter abbreviated as “Tg”) is preferably in the range of −10 to 30 ° C., and in the range of −5 to 20 ° C. because of excellent adhesiveness, water resistance, and solvent resistance. It is more preferable that

As a manufacturing method of the spherical polyester resin particle dispersion for bonding nonwoven fabric of the present invention, as a preferable manufacturing method, for example,
Step (1) Crystalline polyester resin (A) and other additives such as water retention agents and dispersion aids as necessary are melt kneaded using a pressure kneader, heated three rolls, twin screw kneader, etc. To produce a resin melt (I),
Step (2) Next, the resin melt (I) is heated to a temperature equal to or higher than the melting temperature of the polyester resin (A) and, if necessary, in a heated aqueous medium containing a basic compound. And dispersed in a molten state by mechanical means,
Step (3) Thereafter, preferably immediately cooled rapidly,
The manufacturing method etc. which consist of processes, such as these, are mentioned.

Furthermore, as a manufacturing method of the spherical polyester resin particles for nonwoven fabric adhesion of the present invention, for example,
Step (4) After removing the basic compound as necessary from the non-woven fabric adhesion spherical polyester resin particle dispersion obtained by the above production method, the spherical polyester resin particles are separated,
Step (5) Drying the separated spherical polyester resin particles,
The manufacturing method etc. which consist of processes, such as these, are mentioned.

  In the above production method, neutralization of the carboxyl group in the polyester resin (A) is performed by mixing with an aqueous medium containing a basic compound, but neutralization of the carboxyl group is limited to this method. For example, after neutralization with a basic compound of a carboxyl group, the resin melt (I) is dispersed in an aqueous medium by mechanical means, or the resin melt (I) is aqueous A method of neutralizing by adding a basic compound under stirring after being dispersed in a medium by mechanical means may be used.

  Examples of the basic compound that neutralizes the carboxyl group in the crystalline polyester resin (A) include alkali compounds such as sodium hydroxide, potassium hydroxide, and lithium hydroxide, carbonates thereof, acetates thereof, and the like. Furthermore, aqueous ammonia, methylamine, dimethylamine, trimethylamine, alkylamines such as ethylamine, diethylamine and triethylamine, alkanolamines such as diethanolamine, and the like can be mentioned. Among these, aqueous ammonia is preferable. These basic compounds may be used alone or in combination of two or more.

  The amount of the basic compound used is not particularly limited as long as the crystalline polyester resin (A) is stably dispersed in the aqueous medium. However, the basic compound is usually used with respect to the carboxyl group in the polyester resin (A). 0.5-6.0 times equivalent.

  If the basic compound that neutralizes the carboxyl group in the polyester resin (A) is highly volatile, such as ammonia, at the time of producing the non-woven fabric adhesive spherical polyester resin particles, the above-described production process ( It can be completely removed by separation in 4) and drying in step (5). If the basic compound is difficult to volatilize such as sodium hydroxide, it will remain in the spherical polyester resin particles obtained after the separation in step (4) and the drying in step (5). If there is no problem, it may be used as it is, or when the dispersion treatment in an aqueous medium is not performed thereafter, the base compound may be removed from the neutralized carboxyl group, and the carboxyl group may not be neutralized. . Various methods can be used to remove the basic compound. For example, there is a method in which a carboxyl group is liberated by adding a strong acid having a higher acidity than the carboxyl group.

  The aqueous medium may be pressurized as necessary during heating. When the melting temperature of the resin melt (I) is low, it is not always necessary to pressurize, but when the melting temperature is 100 ° C. or higher, it is necessary to pressurize so that the aqueous medium does not boil.

  The apparatus for finely dispersing the resin melt (I) in the step (2) in an aqueous medium by mechanical means is not particularly limited. For example, a Menton Gorin high-pressure homogenizer (Gorin), Continuous ultrasonic homogenizer (Nippon Seiki Co., Ltd.), Nanomizer (Nanomizer Co., Ltd.), Microfluidizer (Mizuho Industrial Co., Ltd.), Hallel homogenizer, Slasher (Mitsui Mining Co., Ltd.), Cavitron (Eurotech Co., Ltd.) Among these, Cavitron, which is a rotary continuous dispersion device, is preferable because of its high dispersion ability and easy production of spherical resin particles.

  The Cavitron, which is the above rotary continuous dispersing device, is coaxially arranged so that a stator having a ring-shaped projection having a slit and a rotor having a ring-shaped projection having a slit are engaged with each other with a space therebetween. The dispersion method using this is a rotating type continuous dispersing apparatus having a structure provided in the above, wherein a resin melt (I) and an aqueous medium are supplied to a central portion of the stator and the rotor, and the rotor is The dispersion apparatus is characterized in that the resin melt (I) is dispersed in the form of spherical particles in the aqueous medium by flowing in the direction from the central portion to the outer periphery through the slit and the interval while being rotated.

  Hereinafter, the manufacturing method using the rotary continuous dispersing apparatus as described above will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an example of a stator of a rotary continuous dispersion device used in the manufacturing method of the present invention, and FIG. 2 shows an example of a rotor of the rotary continuous dispersion device used in the manufacturing method of the present invention. FIG. 3 is a cross-sectional view showing an example of a main part of the rotary continuous dispersing device used in the present invention, and FIG. 4 is a view of a stator protrusion when the AA ′ cross section of FIG. 3 is viewed from the side. It is a figure showing the combination state of the rotor protrusion.

  As shown in FIGS. 1 to 4, the stator 1 of the rotary continuous dispersion device is installed at the center and includes a liquid inlet 2 at the center. On the circular surface of the stator 1, the protrusions 3 concentrically arranged in a ring shape with the stator are provided in one or more stages, and accordingly, in the gap between the protrusions, A circumferential groove 4 is formed. A plurality of slits 5 are formed between the protrusions.

  A driving shaft 6 is installed at the center of the inner wall facing the stator 1 in the dispersing device, and is connected to the driving device and rotated. The rotor 7 is fixed to the front end of the drive shaft so as to be parallel to the stator 1 and aligned with the center. On the surface of the rotor 7 facing the stator 1, projections 8 arranged in a ring shape concentrically with the rotor are provided in one or more stages. Therefore, an annular groove 9 is formed in the gap between the protrusions, like the stator. A plurality of slits 10 are formed between the protrusions.

  The stator 1 and the rotor 7 are used in a state of being engaged so that the protrusion 3 of the stator 1 and the protrusion 8 of the rotor 7 maintain a slight gap.

  The resin melt (I) and the heated aqueous medium (II) are supplied to the liquid inlet 2 of this dispersing apparatus, and the mixture of them is the protrusion of the innermost rotor 7 when the rotor 7 rotates. 8 enters the slit 10 of the rotor 1 and is discharged into the annular groove 9 from the outside of the protrusion 8 of the rotor 7 by centrifugal force, and then enters the slit 5 of the protrusion 3 of the stator 1 located on the innermost side. Further, the mixture flowing into the slit 5 is pushed out into the annular groove 4 of the stator 1.

  In this way, the mixture receives a centrifugal force by the rotation of the rotor 7 and flows in the slit from the liquid inlet to the discharge outlet. On the other hand, due to the gap between the slits of the rotor 7 and the stator 1, a differential pressure is generated by repeatedly containing and releasing the centrifugal flow of the mixture. Furthermore, a shearing force acts on the mixed liquid in a minute gap between the rotor 7 and the stator 1. The flow from the center to the outer circumferential direction and the circumferential flow collide at right angles, thereby generating a strong stirring and crushing effect, whereby the resin melt (I) is heated in the aqueous medium (II). A particle dispersion liquid dispersed in the form of particles is obtained.

  The number of rotations of the rotor 7 of this dispersing device is controlled by a drive motor connected to the drive shaft. As the rotational speed increases and the peripheral speed increases, the particle diameter of the resin melt (I) dispersed in the aqueous medium (II) decreases due to the large centrifugal force and shearing force. In the case of producing spherical particles using a rotor having a diameter of 10 cm, a preferable rotational speed is 3,000 to 10,000 rpm.

  The spherical polyester resin particle dispersion for bonding nonwoven fabric obtained from the production method of the present invention and the spherical polyester resin particle diameter in the spherical polyester resin particle for bonding nonwoven fabric are used for the acid value and neutralization of the crystalline polyester resin (A). It can be easily adjusted by controlling factors such as the type and amount of the basic compound to be used (amount relative to the carboxyl group) and the weight ratio of the polyester resin (A) to the aqueous medium. For example, when the amount of the basic compound used for neutralization is increased with respect to the carboxyl group of the polyester resin (A) even under the same material and conditions, spherical polyester particles having a small volume average particle size are obtained. When the amount is reduced, spherical polyester particles having a large volume average particle can be obtained.

  The spherical polyester resin particles and the non-woven fabric adhesive spherical polyester resin particles in the non-woven fabric adhesive spherical polyester resin dispersion according to the present invention are characterized in that their shapes are spherical. Since the polyester resin particles are spherical, the fluidity as a powder is excellent, and the wettability to the adherend is improved. The “spherical shape” referred to in the present invention is a broad concept including not only a true spherical shape but also an elliptical shape, etc., but it does not include a sharp pointed portion in the shape. A spherical shape is preferable from the viewpoint of improving durability against adhesive strength, water resistance, and solvent resistance.

  The spherical polyester resin particle dispersion for bonding nonwoven fabric and the spherical polyester resin particle for bonding nonwoven fabric according to the present invention include a crystalline polyester resin (A) and other resin components such as a polyester resin other than the crystalline polyester resin (A). , Phenol resin, epoxy resin, petroleum resin, ketone resin, coumarone resin, rosin, rosin phenol resin, acrylic resin, alkyd resin, silicone resin, fluorine resin, polyolefin, polyvinyl chloride, etc. It can also be used in combination as long as the effect is not impaired.

  The non-woven fabric adhesive spherical polyester resin particle dispersion or non-woven fabric adhesive spherical polyester resin particle according to the present invention depends on the use method, use site, etc. of the non-woven fabric adhesive spherical polyester resin particle dispersion or non-woven fabric adhesive spherical polyester resin particle. More preferable adhesive force can be obtained by controlling the volume average particle diameter of the spherical polyester resin particles in a suitable range. For example, when adhering the outer material and the lining, a dispersion or particles composed of relatively small spherical polyester resin particles having a volume average particle diameter of 0.5 to 15 μm are preferable in terms of improving the adhesive strength, and 1 to 10 μm is preferable. More preferably, 2-7 micrometers is still more preferable. Moreover, when preparing an adhesive interlining etc., it is preferable at the point which forms the dispersion layer and particle | grains which consist of spherical polyester resin particles with a volume average particle diameter of 40-250 micrometers, and a thick particle | grain.

  Non-woven fabric adhesive spherical polyester resin particle dispersion and non-woven fabric adhesive spherical polyester resin particles according to the present invention are applied to a non-woven fabric and heat-sealed when the non-woven fabric adhesive spherical polyester resin particles are put into practical use as a hot-melt adhesive (hot melt adhesive). As, for example, a scatter ring method in which spherical polyester resin particles for bonding non-woven fabric are uniformly spread on the surface of the non-woven fabric and heated and fused, and spherical polyester resin particles for bonding non-woven fabric are applied to the surface of the non-woven fabric using a gravure roll. Powder dot method for transferring and heat-sealing, spray that disperses spherical polyester resin particles for non-woven fabric adhesion in water or spherical polyester resin particle dispersion for non-woven fabric adhesion on the surface of the base fabric as it is, spray to heat-dry and fuse Method, paste the paste or dispersion onto the surface of the nonwoven fabric using a coating screen with pores. After forming the anchor layer by applying to the surface of the non-woven fabric using the coating screen having pores, the paste dot method, which is coated in the shape of a paste, heat-dried and fused, and the paste or dispersion is applied to the surface of the nonwoven fabric using a coating screen having pores. Furthermore, after spraying the non-woven fabric adhesive spherical polyester resin particles, there is a method such as a double-dot method in which excess thermoplastic resin powder is removed and heat-dried and fused, and these can be used properly according to the type of non-woven fabric. Among them, the spherical polyester resin particle dispersion for bonding nonwoven fabric and the spherical polyester resin particle for bonding nonwoven fabric of the present invention can be particularly preferably used for forming the double dot anchor layer.

  Further, as an adhesion method, an adhesive applicator is used which is formed into a powder, chip, tape, string, film, or nonwoven fabric, and is bonded to an adherend and heated and melted. The dispersion is applied to the adherend in a molten state, either dispersed in the aqueous medium (II) or after the dispersion is added with other additive components such as anti-settling agent, preservative, etc. to the adherend. Application by an appropriate method such as-, or application of the non-woven fabric adhesive spherical polyester resin particles to an adherend with a powder coating apparatus or the like.

  The spherical polyester resin particle dispersion for bonding nonwoven fabric and the spherical polyester resin particle for bonding nonwoven fabric of the present invention can be used for nonwoven fabrics made from various materials. Examples of materials include natural fibers such as cotton, hemp, silk, and wool; regenerated fibers such as rayon and cupra; semisynthetic fibers such as acetate and triacetate; polyester, nylon, acrylic, urethane, polyethylene, polyvinyl chloride, and the like. Examples include synthetic fibers. Especially, it can use preferably with respect to the nonwoven fabric which used the synthetic fiber as the raw material, and can use it more preferably with respect to the nonwoven fabric which used the raw material of polyester.

  The spherical polyester resin particle dispersion for bonding nonwoven fabric and the spherical polyester resin particle for bonding nonwoven fabric of the present invention can be preferably used for woven fabrics. Examples of the woven fabric include woven fabrics of various fibers such as the above-described natural fibers, regenerated fibers, semi-synthetic fibers, and synthetic fibers. Moreover, it can be used not only for bonding non-woven fabrics but also for bonding non-woven fabrics and woven fabrics.

  The spherical polyester resin particle dispersion for bonding nonwoven fabric and the spherical polyester resin particle for bonding nonwoven fabric of the present invention can be used for bonding nonwoven fabrics used in various fields. For example, it can be used in the field of clothing such as adhesive interlining, the field of protection such as smoke masks, the field of medicine such as leukocyte separators, the field of building such as soundproofing materials, and the field of automobiles such as automobile interiors. It is preferably used for bonding non-woven fabrics used in the field, and more preferably used in the production of adhesive cores in the clothing field.

  The particle size distribution of the polyester resin particles in the spherical polyester resin particles and the non-woven fabric adhesive spherical polyester resin particles in the spherical polyester resin particle dispersion for bonding nonwoven fabric according to the present invention is a distribution of volume average particle diameter using Coulter Multisizer 2. In the measurement, it is usually 1.36 or less.

In the present invention, the particle size distribution of the spherical polyester resin particles refers to a value “√ (D16 / D16 / D16 / D84) ”, where the 16% diameter is the volume particle diameter of the particles at a position where the weight when the weight of the particles is integrated from the larger volume particle diameter side is 16% of the total weight. The 84% diameter refers to the volume particle diameter of the particles at a position where the weight when the weight of the particles is integrated is 84% of the total weight. A larger value indicates a larger particle size distribution, and a smaller value indicates a smaller particle size distribution. That this number is 1.36 or less
As a spherical polyester resin particle for bonding nonwoven fabrics, the particle size distribution is extremely narrow, and the wettability to the adherend is markedly improved compared to conventional hot-melt adhesives by mechanical grinding. It is excellent in workability such as being able to bond with.

  Next, the present invention will be described specifically by way of examples. In the examples, “parts” and “%” are based on weight unless otherwise specified.

In this example, the measurement of the weight average molecular weight by the GPC method was performed using Shodex GPC SYSTEM-21 [manufactured by Showa Denko KK].
The melt viscosity of the resin or resin particles was measured using a Koka-type flow tester [manufactured by Shimadzu Corporation, CFT-500]. The measurement conditions are a temperature increase rate of 6 ° C./min, a load of 10 kg, and a die of 1 mmφ × 1 mm. The crystal melting heat was measured using a differential scanning calorimeter [Seiko Electronic Thermal Analysis System (DSC220)] at a temperature elevation rate of 10 ° C./min. The Tg was measured by measuring the heat of crystal fusion, quenching with liquid nitrogen, and again measuring at a temperature rising rate of 10 ° C./min.

Synthesis Example 1 [Synthesis of Crystalline Polyester Resin (A)]
979 parts of 1,5-pentanediol (89.5 mol% with respect to alcohol component) and 55 parts of trimethylolpropane (3 parts) were added to a 3 liter flask equipped with a stirrer, nitrogen inlet tube, temperature sensor and rectifying column. .9 mol% with respect to alcohol component), PEG-1500 (polyethylene glycol manufactured by NOF Corporation; hydroxyl value 198.6 mg KOH / g) and 137 parts (2.3 mol% with respect to alcohol component) were charged, and an additional hour was required. Then, the temperature was raised to 150 ° C., and after confirming that the inside of the reaction system was uniformly stirred, 1.2 parts of dibutyltin oxide and 1566 parts of terephthalic acid (92.1 mol% to acid component) were added. . Further, while distilling off the generated water, the temperature was raised from the same temperature to 245 ° C. in 6 hours, the temperature was raised, and the dehydration condensation reaction was continued at 245 ° C. for another 14 hours. At 7.7 mg KOH / g, the reaction temperature was lowered to 230 ° C., 120 parts of phthalic anhydride (7.9 mol% with respect to the acid component) was added, followed by addition reaction for 30 minutes, and the acid value was 26.7 mg KOH / g. 115 parts (4.3 mol% with respect to alcohol component) of Cardura E10 [Glycidyl ester of branched fatty acid (10 carbon atoms) manufactured by Shell Chemical Co., Ltd.] were added, and the reaction was further performed for 30 minutes. Finally, the temperature (T4) at which the acid value is 16.9 mgKOH / g, the weight average molecular weight by GPC is 42,000, the melt viscosity is 1 × 10 ⁴ Pa · s is 105 ° C., Tg is 1 ° C., crystal melting A polyester resin having a heat quantity of 25.3 J / g was obtained. This is abbreviated as crystalline polyester resin (A1).

Synthesis example 2 (same as above)
979 parts of 1,5-pentanediol (93.5 mol% with respect to alcohol component) and 55 parts of trimethylolpropane (4 parts) were added to a 3 liter flask equipped with a stirrer, nitrogen inlet tube, temperature sensor and rectifying column. .1 mol% with respect to alcohol component) and 137 parts of PEG-1500 (2.4 mol% with respect to alcohol component) were added, and the temperature was raised to 150 ° C. over 1 hour, and the reaction system was uniformly stirred. Then, 1.2 parts of dibutyltin oxide and 1566 parts of terephthalic acid (96.1 mol% to acid component) were added. Further, while distilling off the generated water, the temperature was raised from the same temperature to 245 ° C. in 6 hours, the temperature was raised, and the dehydration condensation reaction was continued at 245 ° C. for another 14 hours. 100 parts of dodecenyl succinic anhydride (3.9 mol% with respect to the acid component) was added at 7.7 mg KOH / g, and then the reaction was performed for 30 minutes. Finally, a polyester resin having an acid value of 16.7 mgKOH / g, a weight average molecular weight of 38,500 by GPC method, T4 of 120 ° C., Tg of 3 ° C., and a crystal melting heat of 35.1 J / g was obtained. . This is abbreviated as crystalline polyester resin (A2).

Synthesis example 3 (same as above)
979 parts of 1,5-pentanediol (93.5 mol% with respect to alcohol component) and 55 parts of trimethylolpropane (4 parts) were added to a 3 liter flask equipped with a stirrer, nitrogen inlet tube, temperature sensor and rectifying column. .1 mol% with respect to alcohol component) and 137 parts of PEG-1500 (2.4 mol% with respect to alcohol component) were added, and the temperature was raised to 150 ° C. over 1 hour, and the reaction system was uniformly stirred. Then, 1.2 parts of dibutyltin oxide and 1096 parts of terephthalic acid (67.3 mol% to acid component) were added. Further, while distilling off the generated water, the temperature was raised from the same temperature to 245 ° C. over 6 hours, and after confirming that the resin solution was clear, 470 parts of isophthalic acid (28.9 mol% to acid component) ) Was added, and the dehydration condensation reaction was continued for an additional 14 hours at 245 ° C., after which the acid value was monitored, the acid value was 9.0 mgKOH / g, the reaction temperature was lowered to 230 ° C., and dodecenyl succinic anhydride 100 Part (3.9 mol% to acid component) was added, and then the reaction was carried out for 30 minutes. Finally, the acid value is 18.4 mgKOH / g, the weight average molecular weight by GPC method is 51,000, the temperature (T4) at which the melt viscosity is 1 × 10 ⁴ Pa · s is 60 ° C., and Tg is 7.2 ° C. A polyester resin having a heat of crystal fusion of 3 J / g was obtained. This is abbreviated as crystalline polyester resin (A3).

Synthesis Example 4 (Synthesis of polyester resin for comparison)
Into a 3 liter flask equipped with a stirrer, nitrogen inlet tube, temperature sensor and rectifying column, 979 parts of 1,5-pentanediol, 55 parts of trimethylolpropane, and 137 parts of PEG-1500 were added. After taking time, the temperature was raised to 150 ° C., and after confirming that the reaction system was uniformly stirred, 1.2 parts of dibutyltin oxide and 1566 parts of terephthalic acid were added. Further, while distilling off the generated water, the temperature was raised from the same temperature to 245 ° C. in 6 hours, the temperature was raised, and the dehydration condensation reaction was continued at 245 ° C. for another 14 hours. At 7.7 mg KOH / g, the reaction temperature was lowered to 230 ° C., 65 parts of phthalic anhydride was added, and then an addition reaction was carried out at the same temperature for 30 minutes. Finally, the acid value was 17.2 mg KOH / g, according to GPC method. A polyester resin having a weight average molecular weight of 38,000, T4 of 123 ° C., Tg of 8 ° C., and crystal heat of fusion of 40.1 J / g was obtained. This is abbreviated as a comparative polyester resin (x1).

Synthesis example 5 (same as above)
1,234 parts of ethylene oxide adduct of bisphenol A (average added mole number 2.2, hydroxyl value 360 mgKOH / g) in a 3 liter flask equipped with a stirrer, nitrogen inlet tube, temperature sensor and rectifying column Then, 274 parts of diethylene glycol and 110 parts of trimethylolpropane were charged, and 1.25 parts of dibutyltin oxide was added while stirring the mixture by raising the temperature to 140 ° C. over 1 hour. Thereafter, 1,122 parts of terephthalic acid was added, and the temperature was further increased to 245 ° C. over 3 hours. The dehydration condensation reaction was continued at 245 ° C. for an additional 4 hours while distilling off the generated water. Monitored, 114 parts of dodecenyl succinic anhydride was added at an acid value of 5.8 mg KOH / g, followed by addition reaction for 30 minutes, and finally the acid value was 16.3 mg KOH / g, and the weight average molecular weight by GPC method was 75. A polyester resin having a Tg of 110 ° C. and a Tg of 50 ° C. was obtained. When the heat of crystal fusion of this polyester resin was measured, the peak of heat of fusion did not appear and it did not have a crystal structure. This is abbreviated as polyester resin (x2).

Example 1
The crystalline polyester resin (A1) was heated to 150 ° C. to obtain a resin melt, and transferred to Cavitron CD1010 (manufactured by Eurotech Co., Ltd.) at a rate of 100 g / min. A separately prepared aqueous medium tank is filled with 1.0% strength diluted ammonia water obtained by diluting reagent ammonia water with ion-exchanged water, and heated to 120 ° C. with a heat exchanger, 0.1 liter per minute [polyester resin ( A1) was transferred to the Cavitron simultaneously with the resin melt at a rate of 2 times the theoretical neutralization amount of the carboxyl group in A1). A polyester resin (A1) is dispersed under operating conditions of a rotor rotation speed of 7500 rpm and a pressure of 5 kg / cm ² to produce a dispersion having a temperature of 135 ° C., and the temperature is cooled to 35 ° C. in 10 seconds, and then from the outlet. I took it out. When the shape of the polyester resin particles in the polyester resin particle dispersion for adhesive was determined according to the following definition, the shape was spherical and granulation was extremely good. The concentration of the nonvolatile content was 50.4%. The volume average particle size of the polyester resin particles was 1.8 μm and the particle size distribution was 1.36 as measured by Coulter Multisizer 2. This polyester resin particle dispersion for adhesives is abbreviated as (D-1).
Next, (D-1) was filtered, and the polyester resin was washed with water and dried to obtain polyester resin particles for adhesive. This is abbreviated as (P-1). T4 of (P-1) was 105 ° C. and Tg was 1 ° C.

Definition of the shape of polyester resin particles.
Determined according to the following definition by visual observation with a microscope (300 times) (the same applies hereinafter).
(1) Spherical shape Appropriately a perfect sphere by visual observation or an ellipsoid with a ratio (a / b) of the major axis length (a) to minor axis length (b) of less than 2 Are present in the field of view of the microscope in an amount of 80% or more (average value of 10 fields).
(2) A string-like ellipsoid whose ratio (a / b) of the length (a) of the major axis to the length (b) of the minor axis is 2 or more on the number basis in the field of view of the microscope. Existence of 20% or more (average value of 10 fields of view).
(3) Amorphous shape A shape that has been crushed without any regularity in shape, and has a sharp point.

  Test pieces were prepared using the obtained (D-1) and (P-1), and tested for adhesive strength, water resistance, and solvent resistance. The results are shown in Table 1 together with the resin particle diameter. The test piece production method and each test method are as follows.

<Test piece preparation method>
(D-1) and (P-1) are uniformly sprayed on a commercially available polyester nonwoven fabric so that the coating amount is 25 g / m ^{2 in} terms of solid content, and then a commercially available polyester cloth is superimposed on the coated surface. In addition, thermocompression bonding was performed from above and below with a hot press machine. The bonding condition is 140 ° C./8 seconds at a pressure of 3 kg / cm ² .

<Testing method for adhesive strength>
Using a Tensilon tensile tester, 180 ° peel adhesion was evaluated according to JIS L-1086 (adhesive peel test method). The measurement conditions are a temperature of 20 ° C. and a relative humidity of 60%.

<Water resistance test method>
The test piece after thermocompression bonding was kept in warm water at a temperature of 60 ° C. for 30 minutes under a constant temperature condition, and then the peel adhesive strength was measured according to the above adhesive strength test method.

<Solvent resistance test method>
The test piece after thermocompression bonding was kept in petroleum benzene at room temperature for 30 minutes under a constant temperature condition, and then the peel adhesive strength was measured according to the test method for adhesive strength.

Example 2
Polyester resin particles having a volume average particle diameter of 1.2 μm and a particle size distribution of 1.34, as in Example 1, except that the polyester resin (A2) was used instead of the polyester resin (A1) of Example 1. A dispersion was obtained. This is abbreviated as (D-2). When the shape of the polyester resin particles in (D-2) was determined, it was spherical.
Next, (D-2) was filtered, and the polyester resin was washed with water and dried to obtain polyester resin particles. This is abbreviated as (P-2). T4 of (P-2) was 119 ° C. and Tg was 4 ° C. Evaluation similar to Example 1 was performed, and the results are shown in Table 1 together with the resin particle diameter.

Example 3
Polyester resin particles having a volume average particle diameter of 1.9 μm and a particle size distribution of 1.35, as in Example 1, except that the polyester resin (A3) is used instead of the polyester resin (A1) of Example 1. A dispersion was obtained. This is abbreviated as (D-3). When the shape of the polyester resin particles in (D-3) was determined, it was spherical.
Next, (D-3) was filtered, and the polyester resin was washed with water and dried to obtain polyester resin particles. This is abbreviated as (P-3). T4 of (P-3) was 61 ° C. and Tg was 7.5 ° C. Evaluation similar to Example 1 was performed, and the results are shown in Table 1 together with the resin particle diameter.

Comparative Example 1
Polyester resin particles having a volume average particle size of 10.4 μm and a particle size distribution of 1.47, in the same manner as in Example 1, except that the polyester resin (x1) was used instead of the polyester resin (A1) of Example 1. A dispersion was obtained. This is abbreviated as (D-4). When the shape of the polyester resin particles in (D-4) was determined, it was a string.
Next, (D-4) was filtered, and the polyester resin was washed with water and dried to obtain polyester resin particles. This is abbreviated as (P-4). T4 of (P-4) was 123 ° C. and Tg was 8 ° C.
The same evaluation as in Example 1 was performed, and the results are shown in Table 2 together with the resin particle diameter.

Comparative Example 2
Polyester resin particles having a volume average particle size of 1.4 μm and a particle size distribution of 1.32 in the same manner as in Example 1 except that the polyester resin (x2) was used instead of the polyester resin (A1) of Example 1. A dispersion was obtained. This is abbreviated as (D-5). When the shape of the polyester resin particles in (D-5) was determined, it was spherical.
Next, (D-5) was filtered, and the polyester resin was washed with water and dried to obtain polyester resin particles. This is abbreviated as (P-5). T4 of (P-5) was 109 ° C. and Tg was 49 ° C. The same evaluation as in Example 1 was performed, and the results are shown in Table 2 together with the resin particle diameter.

  Adhesion with strong adhesive strength and excellent water resistance and solvent resistance by using the non-woven fabric adhesive spherical polyester resin particle dispersion or non-woven fabric adhesive spherical polyester resin particle of the present invention as a heat-bonding adhesive for non-woven fabric adhesion The surface can be obtained and the improvement of the performance of various nonwoven fabric products can be expected.

It is a perspective view which shows an example of the stator of the rotation type continuous dispersion apparatus used by this invention. It is a perspective view which shows an example of the rotor of the rotary type continuous dispersion apparatus used by this invention. It is sectional drawing showing an example of the principal part of the rotary type continuous dispersion apparatus used by this invention. FIG. 4 is a diagram illustrating a combined state of a stator protrusion and a rotor protrusion when the A-A ′ portion of FIG. 3 is viewed from a side surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 Liquid inlet 3 Stator protrusion 4 Stator circumferential groove 5 Stator protrusion slit 6 Rotor drive shaft 7 Rotor 8 Rotor protrusion 9 Rotor circumferential groove 10 Rotor protrusion slit

Claims (10)

  It contains an alkyl group having 4 to 20 carbon atoms and / or an alkenyl group and a carboxyl group having 4 to 20 carbon atoms, has a heat of crystal melting by a differential scanning calorimeter of 3 to 50 J / g, and has a gel permeation -A resin obtained by neutralizing part or all of the carboxyl groups in the crystalline polyester resin (A) having a weight average molecular weight (Mw) of 20,000 to 150,000 as determined by the chromatography chromatography (GPC) method is essential. A spherical polyester resin particle dispersion for bonding nonwoven fabric, which is an aqueous dispersion of spherical resin particles contained as a component.   The crystalline polyester resin (A) has an acid anhydride having an alkyl group having 4 to 20 carbon atoms or an alkenyl group having 4 to 20 carbon atoms bonded to the terminal hydroxyl group of the polyester resin having a hydroxyl group at the terminal. The spherical polyester resin particle dispersion for bonding nonwoven fabric according to claim 1, which is a polyester resin obtained by ring-opening addition.   The spherical polyester resin particle dispersion for bonding nonwoven fabric according to claim 1 or 2, wherein the crystalline polyester resin (A) has a glass transition temperature (Tg) of -10 to 30 ° C.   The nonwoven fabric according to claim 1 or 2, wherein 65 to 100 mol% of the acid component constituting the crystalline polyester resin (A) is terephthalic acid and 70 to 100 mol% of the alcohol component is 1,5-pentanediol. Spherical polyester resin particle dispersion for bonding.   The spherical polyester resin particle dispersion for nonwoven fabric bonding according to any one of claims 1 to 4, wherein the spherical resin particles have a volume average particle diameter of 0.5 to 15 µm.   It contains an alkyl group having 4 to 20 carbon atoms and / or an alkenyl group and a carboxyl group having 4 to 20 carbon atoms, has a heat of crystal melting by a differential scanning calorimeter of 3 to 50 J / g, and has a gel permeation -Spherical resin particles containing, as an essential component, a crystalline polyester resin (A) having a weight average molecular weight (Mw) of 20,000 to 150,000 as determined by the chromatography chromatography (GPC) method, or the polyester resin (A) A spherical polyester resin particle for bonding nonwoven fabric, comprising spherical resin particles containing, as an essential component, a resin obtained by neutralizing some or all of the carboxyl groups therein with a basic compound.   The crystalline polyester resin (A) has an acid anhydride having an alkyl group having 4 to 20 carbon atoms or an alkenyl group having 4 to 20 carbon atoms bonded to the terminal hydroxyl group of the polyester resin having a hydroxyl group at the terminal. The spherical polyester resin particles for bonding nonwoven fabric according to claim 6, which is a polyester resin obtained by ring-opening addition.   The spherical polyester resin particles for bonding nonwoven fabric according to claim 6 or 7, wherein the crystalline polyester resin (A) has a glass transition temperature (Tg) of -10 to 30 ° C.   The nonwoven fabric according to claim 6 or 7, wherein 65 to 100 mol% of the acid component constituting the crystalline polyester resin (A) is terephthalic acid and 70 to 100 mol% of the alcohol component is 1,5-pentanediol. Spherical polyester resin particles for bonding. The spherical polyester resin particles for bonding nonwoven fabric according to any one of claims 6 to 9, wherein the spherical resin particles have a volume average particle diameter of 0.5 to 15 µm.

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