WO2015002308A1 - Composition d'agent adhésif thermofusible, et article apte à absorber l'eau fabriqué à l'aide de celle-ci - Google Patents

Composition d'agent adhésif thermofusible, et article apte à absorber l'eau fabriqué à l'aide de celle-ci Download PDF

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Publication number
WO2015002308A1
WO2015002308A1 PCT/JP2014/067955 JP2014067955W WO2015002308A1 WO 2015002308 A1 WO2015002308 A1 WO 2015002308A1 JP 2014067955 W JP2014067955 W JP 2014067955W WO 2015002308 A1 WO2015002308 A1 WO 2015002308A1
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WIPO (PCT)
Prior art keywords
styrene
melt adhesive
adhesive composition
hot melt
block copolymer
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PCT/JP2014/067955
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English (en)
Japanese (ja)
Inventor
和頼 嶋村
裕貴 吉田
村本　禎
Original Assignee
積水フーラー株式会社
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Application filed by 積水フーラー株式会社 filed Critical 積水フーラー株式会社
Priority to CN201480001723.1A priority Critical patent/CN104411796B/zh
Publication of WO2015002308A1 publication Critical patent/WO2015002308A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J153/02—Vinyl aromatic monomers and conjugated dienes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/84—Accessories, not otherwise provided for, for absorbent pads
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L13/00—Compositions of rubbers containing carboxyl groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J113/00—Adhesives based on rubbers containing carboxyl groups

Definitions

  • the present invention relates to a hot melt adhesive composition, and more particularly to a hot melt adhesive composition suitably used for producing a water-absorbing article such as a paper diaper.
  • Assembly of water-absorbing articles such as paper diapers and sanitary napkins is performed by bonding members such as polyolefin resin films, nonwoven fabrics, tissues, and natural rubber with a hot melt adhesive.
  • Hot melt adhesives used in water-absorbing articles are mainly rubber hot melt adhesives composed mainly of styrene block copolymers, ethylene-propylene-butene copolymers, and ethylene-vinyl acetate copolymers.
  • An olefinic hot melt adhesive as a component is used.
  • rubber hot melt adhesives are widely used because they are excellent in adhesiveness, cohesive force, and creep resistance with respect to olefin hot melt adhesives.
  • a porous substrate (such as a tissue) made of a natural material such as a cellulosic material or a cotton-based material or a non-woven fabric subjected to a hydrophilization treatment is a hydrophilic porous substrate.
  • a hydrophilic porous substrate has a high polarity on the surface, whereas a rubber-based hot melt adhesive has a low polarity, so that the hydrophilic porous substrate and the rubber-based hot melt adhesive Low affinity. For this reason, even when a hot melted rubber-based hot melt adhesive and a hydrophilic porous substrate are pressure-bonded, the rubber-based hot melt adhesive hardly flows into the pores of the hydrophilic porous substrate.
  • Patent Document 1 discloses a hot melt adhesive composition further containing a wax modified with a carboxylic acid and / or a carboxylic acid anhydride in addition to a styrene block copolymer.
  • the wax modified with carboxylic acid and / or carboxylic acid anhydride can impart polarity to the hot melt adhesive composition, and thereby the affinity of the hot melt adhesive composition to the hydrophilic porous substrate. It becomes possible to improve the wet adhesion of the hot melt adhesive composition.
  • the hot melt adhesive composition of the cited document 1 exhibits the excellent fluidity with a low melt viscosity at a high temperature of 150 ° C. or higher due to the addition of the wax described above, the temperature is lower than that. Then, solidification proceeds rapidly, the melt viscosity increases, and the fluidity decreases. Therefore, the hot melt temperature of the hot melt adhesive composition at the time of coating is low, or the time (open time) from application of the hot melt adhesive composition to bonding of the hydrophilic porous substrate is long. If this is the case, the hydrophilic porous substrate is bonded to the hot melt adhesive composition whose solidification has progressed considerably and the fluidity has become low, and the hot melt adhesive composition has a fine structure of the hydrophilic porous substrate.
  • Patent Document 1 It becomes difficult to flow into the pores, and the contact area between the rubber-based hot melt adhesive and the hydrophilic porous substrate is reduced. For this reason, the hot melt adhesive composition of Patent Document 1 is required to exhibit sufficient adhesive strength to a wet hydrophilic porous substrate even when applied at a low temperature.
  • the wax modified with carboxylic acid and / or carboxylic anhydride has low compatibility with other components contained in the hot melt adhesive composition. Therefore, by using such a wax, the thermal stability of the hot melt adhesive composition is lowered. If a hot-melt adhesive composition with low thermal stability is left in a heated and melted state for a long time, the hot-melt adhesive composition may be discolored or may be poorly coated due to gelation or carbonization. .
  • the present invention is capable of expressing excellent adhesive strength with respect to a wet hydrophilic porous substrate even at a relatively low temperature, and is a hot melt adhesive composition having excellent thermal stability.
  • the purpose is to provide goods.
  • the hot-melt adhesive composition of the present invention comprises a styrene-isoprene-styrene block copolymer having a styrene component content of 15 to 35% by weight, and a styrene-butadiene having a styrene component content of 15 to 35% by weight.
  • a styrene block copolymer and a thermoplastic block copolymer containing at least one selected from the group consisting of styrene-butadiene / butylene-styrene block copolymers having a styrene component content of 15 to 35% by weight ( A) 100 parts by weight, 0.05 to 10 parts by weight of a liquid rubber (B) having a carboxyl group and / or a carboxylic anhydride group in the molecule; A tackifying resin (C); It is characterized by containing.
  • thermoplastic block copolymer (A) examples include a styrene-isoprene-styrene block copolymer, a styrene-butadiene-styrene block copolymer, and a styrene-butadiene / butylene-styrene block copolymer.
  • a thermoplastic block copolymer may be used individually by 1 type, and may use 2 or more types together.
  • the content of the styrene component in the styrene-isoprene-styrene block copolymer is limited to 15 to 35% by weight, but preferably 20 to 30% by weight.
  • a styrene-isoprene-styrene block copolymer having a styrene component content that is too high may increase the solidification rate of the hot-melt adhesive composition that has been heated and melted, thereby reducing the wet adhesion of the hot-melt adhesive composition. There is.
  • the content of the styrene component in the styrene-butadiene-styrene block copolymer is limited to 15 to 35% by weight, but preferably 20 to 30% by weight. If the styrene-butadiene-styrene block copolymer has an excessively high styrene content, the solidification rate of the hot-melt adhesive composition heated and melted will increase, and the wet adhesion of the hot-melt adhesive composition may be reduced. There is.
  • the cohesive strength of the hot-melt adhesive composition itself may be reduced, and the adhesive strength may be insufficient.
  • the content of the styrene component in the styrene-butadiene / butylene-styrene block copolymer is limited to 15 to 35% by weight, but preferably 20 to 30% by weight.
  • a styrene-butadiene / butylene-styrene block copolymer having a styrene component content that is too high the solidification rate of the hot melt adhesive composition heated and melted is increased, and the wet adhesiveness of the hot melt adhesive composition is reduced. There is a risk of causing it.
  • the content of the styrene component in the thermoplastic block copolymer (A) is limited to 15 to 35% by weight with respect to the total amount of the thermoplastic block copolymer (A), but is 20 to 30% by weight. preferable.
  • the thermoplastic block copolymer (A) in which the content of the styrene component is too high the solidification rate of the hot melt adhesive composition heated and melted is increased, and the wet adhesiveness of the hot melt adhesive composition may be reduced. There is.
  • the thermoplastic block copolymer (A) in which the content of the styrene component is too low the cohesive force of the hot melt adhesive composition itself is lowered, and the adhesive force may be insufficient.
  • the weight average molecular weight (Mw) of the styrene-isoprene-styrene block copolymer is preferably 50,000 to 300,000, more preferably 70,000 to 250,000, and particularly preferably 100,000 to 200,000. If the styrene-isoprene-styrene block copolymer has a weight average molecular weight (Mw) that is too small, the cohesive strength of the hot-melt adhesive composition itself may be reduced and the adhesive strength may be insufficient.
  • melt viscosity of the hot melt adhesive composition may be too high and the fluidity may be impaired.
  • the weight average molecular weight (Mw) of the styrene-butadiene-styrene block copolymer is preferably 50,000 to 300,000, more preferably 70,000 to 250,000, and particularly preferably 100,000 to 200,000. If the styrene-butadiene-styrene block copolymer has a weight average molecular weight (Mw) that is too small, the cohesive strength of the hot-melt adhesive composition itself may be reduced and the adhesive strength may be insufficient.
  • melt viscosity of the hot melt adhesive composition may be too high and the fluidity may be impaired.
  • the weight average molecular weight (Mw) of the styrene-butadiene / butylene-styrene block copolymer is preferably 50,000 to 300,000, more preferably 70,000 to 250,000, and particularly preferably 100,000 to 200,000. preferable.
  • Mw weight average molecular weight
  • melt viscosity of the hot melt adhesive composition may be too high and the fluidity may be impaired.
  • the weight average molecular weight (Mw) of the thermoplastic block copolymer (A) is preferably 50,000 to 300,000, more preferably 70,000 to 250,000, and particularly preferably 100,000 to 200,000.
  • Mw weight average molecular weight
  • the cohesive force of the hot-melt adhesive composition itself may be reduced and the adhesive force may be insufficient.
  • the melt viscosity of the hot melt adhesive composition may be too high and the fluidity may be impaired.
  • the weight of styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-butadiene / butylene-styrene block copolymer, and thermoplastic block copolymer (A) An average molecular weight means the measured value obtained by converting each in standard polystyrene using a gel permeation chromatography measuring device.
  • the hot melt adhesive composition of the present invention contains a liquid rubber (B) having a polar group in the molecule.
  • the polar group include a carboxyl group (—COOH) and a carboxylic anhydride group (—CO—O—CO—).
  • the liquid rubber (B) may have one or both of a carboxyl group and a carboxylic anhydride group.
  • liquid rubber means a rubber that exhibits a liquid state at 23 ° C. and 1.01 ⁇ 10 5 Pa (1 atm).
  • the liquid rubber (B) can be applied to a porous porous substrate (such as a tissue) made of a natural material such as a cellulose-based material or a cotton-based material, or a hydrophilic porous substrate such as a nonwoven fabric subjected to a hydrophilic treatment
  • a porous porous substrate such as a tissue
  • a natural material such as a cellulose-based material or a cotton-based material
  • a hydrophilic porous substrate such as a nonwoven fabric subjected to a hydrophilic treatment
  • the hot melt adhesive composition contains the liquid rubber (B), it exhibits a low melt viscosity after heating and melting and exhibits excellent fluidity, and also rapidly solidifies as the temperature decreases. It is highly suppressed that the melt viscosity increases and the fluidity decreases.
  • the hot-melt adhesive composition can exhibit excellent adhesive strength to the hydrophilic porous substrate, and the hydrophilic porous substrate wets such excellent adhesive strength. Even if it becomes a state, it can be maintained.
  • the hot melt adhesive composition of the present invention it is possible to improve the thermal stability of the hot melt adhesive composition. Therefore, after the hot melt adhesive composition of the present invention is heated and melted, the hot melt adhesive composition can be colored, gelled, or carbonized even when stored in a tank for a long time in the melted state. It is also possible to suppress the occurrence of high.
  • the liquid rubber (B) has an ⁇ -olefin homopolymer, ethylene- ⁇ -olefin copolymer, ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-propylene-diene as the main chain.
  • Hydrogenated copolymer ethylene-butylene copolymer, polyisoprene, polybutadiene, polypentadiene, polycyclopentadiene, styrene-butadiene block copolymer, acrylonitrile-butadiene copolymer, or acrylonitrile-butadiene copolymer
  • a liquid rubber made of a hydrogenated product and having a polar group at the end or side chain of the main chain may be mentioned.
  • a liquid rubber (B) may be used individually by 1 type, and 2 or more types may be used together.
  • the main chain of the liquid rubber (B) is preferably made of polyisoprene, polybutadiene, or styrene-butadiene block copolymer, and more preferably made of polyisoprene. Since such a liquid rubber (B) has excellent compatibility with the above-described thermoplastic block copolymer (A), the fluidity and thermal stability of the hot-melt adhesive composition heated and melted. Not only can be improved, but also wet adhesion can be improved.
  • the number average molecular weight (Mn) of the liquid rubber (B) is preferably 1,000 to 150,000, and more preferably 10,000 to 100,000. When the number average molecular weight (Mn) is too small, the liquid rubber (B) may reduce the cohesive strength of the hot melt adhesive composition and may result in insufficient wet adhesion. Further, in the case of the liquid rubber (B) having a number average molecular weight (Mn) that is too large, the melt viscosity of the hot melt adhesive composition may be excessively increased and the fluidity may be lowered.
  • the number average molecular weight (Mn) of liquid rubber (B) means the measured value obtained by converting with standard polystyrene using a gel permeation chromatography measuring apparatus.
  • liquid rubber (B) which has a polar group in a molecule
  • examples of liquid polyisoprene having a carboxyl group include a product name “Kuraprene LIR-410” manufactured by Kuraray Co., Ltd.
  • examples of the liquid polyisoprene having a carboxylic anhydride group include a product name “Kuraprene LIR-403” manufactured by Kuraray Co., Ltd.
  • liquid acrylonitrile butadiene copolymer having a carboxyl group include a product name “CTBN 1300 ⁇ 8” manufactured by BF Goodrich.
  • the content of the liquid rubber (B) in the hot melt adhesive composition is limited to 0.05 to 10 parts by weight with respect to 100 parts by weight of the thermoplastic block copolymer (A). 10 parts by weight is preferable, and 3 to 10 parts by weight is more preferable.
  • the hot melt adhesive composition in which the content of the liquid rubber (B) is too low the wet adhesiveness may be low.
  • the thermal stability may be low.
  • Tackifying resin (C) The hot melt adhesive composition of the present invention contains a tackifying resin (C).
  • Tackifying resins (C) include natural rosin, modified rosin, hydrogenated rosin, natural rosin glycerol ester, modified rosin glycerol ester, natural rosin pentaerythritol ester, modified rosin pentaerythritol ester, hydrogenated rosin penta Erythritol ester, natural terpene copolymer, three-dimensional polymer of natural terpene, hydrogenated derivative of hydrogenated terpene copolymer, polyterpene resin, hydrogenated derivative of phenolic modified terpene resin, aliphatic petroleum hydrocarbon resin, fat Hydrogenated derivatives of aromatic petroleum hydrocarbon resins, aromatic petroleum hydrocarbon resins, hydrogenated derivatives of aromatic petroleum hydrocarbon resins, cycloaliphatic petroleum hydrocarbon resins, hydrogenated derivatives of cycloaliphatic petroleum hydrocarbon resin
  • the softening point of the tackifier resin (C) is preferably 80 to 120 ° C, more preferably 100 to 120 ° C. According to the tackifying resin (C) whose softening point is within the above range, the wet adhesiveness of the hot melt adhesive can be further improved.
  • the softening point of the tackifier resin (C) is a value measured by a method according to JIS K6863.
  • the content of the tackifying resin (C) in the hot melt adhesive composition is preferably 10 to 500 parts by weight, more preferably 40 to 400 parts by weight, per 100 parts by weight of the thermoplastic block copolymer (A). Preferably, 150 to 300 parts by weight are most preferable.
  • the adhesive force may be low.
  • the hot melt adhesive composition having a too high content of the tackifier resin (C) becomes a hard and brittle cured product after curing, there is a possibility that the low-temperature adhesiveness of the hot melt adhesive composition is lowered. .
  • the hot melt adhesive composition of the present invention may contain other additives in addition to the thermoplastic block copolymer (A), the liquid rubber (B) and the tackifying resin (C).
  • other additives include a plasticizer (D), an antioxidant, an ultraviolet absorber, and a filler.
  • plasticizer (D) examples include paraffinic process oil, naphthenic process oil, and aromatic process oil. Of these, paraffinic process oil and naphthenic process oil are more preferable, and paraffinic process oil is particularly preferable. According to these plasticizers, a hot melt adhesive composition having excellent wet adhesive strength can be provided. In addition, these plasticizers may be used independently and 2 or more types may be used together.
  • Paraffinic process oil contains aliphatic chain hydrocarbons.
  • the carbon number of the aliphatic chain hydrocarbon contained in the paraffinic process oil is not particularly limited, but is preferably 16 to 40, more preferably 20 to 30.
  • the number average molecular weight (Mn) of the paraffinic process oil is preferably 100 to 1500, and more preferably 250 to 1000. If the number average molecular weight (Mn) is too small, the paraffinic process oil may reduce the cohesive strength of the hot-melt adhesive composition, resulting in insufficient wet adhesion. Moreover, in the case of a paraffinic process oil having a number average molecular weight (Mn) that is too large, the melt viscosity of the hot melt adhesive composition may be excessively increased and the coatability may be reduced.
  • commercially available products can be used as the paraffinic process oil.
  • Commercially available products include, for example, the product name “NA Solvent” manufactured by Nippon Oil and Fats, the product name “PW-380” manufactured by Idemitsu Kosan Co., Ltd., the product name “Diana Fresia S32” manufactured by Idemitsu Kosan Co., Ltd., and the product name “PS-32” manufactured by Idemitsu Kosan Co., Ltd. ", Trade name” IP-Solvent 2835 "manufactured by Idemitsu Petrochemical Co., Ltd., trade name” Neothiozole “manufactured by Sanko Chemical Co., Ltd., and the like.
  • the naphthenic process oil is not particularly limited as long as it contains an aliphatic cyclic hydrocarbon, but the aliphatic cyclic hydrocarbon contained in the naphthenic process oil preferably has 3 or more carbon atoms. More preferably.
  • the number average molecular weight (Mn) of the naphthenic process oil is preferably 100 to 1500, and more preferably 250 to 1000.
  • a naphthenic process oil having a number average molecular weight (Mn) that is too small may reduce the cohesive strength of the hot melt adhesive composition, resulting in insufficient wet adhesion.
  • a naphthenic process oil having a number average molecular weight (Mn) that is too large there is a possibility that the melt viscosity of the hot melt adhesive composition is excessively increased and the coatability is lowered.
  • the number average molecular weight (Mn) of the paraffinic process oil and the naphthenic process oil is a measured value obtained by conversion with standard polystyrene using a gel permeation chromatography measuring device, respectively. Means that.
  • the content of the plasticizer (D) in the hot melt adhesive composition is preferably 25 to 250 parts by weight, more preferably 50 to 150 parts by weight with respect to 100 parts by weight of the thermoplastic block copolymer (A). preferable.
  • a hot melt adhesive composition in which the content of the plasticizer (D) is too high there is a possibility that the creep resistance is lowered, or the cohesive force is lowered and the wet adhesiveness is lowered.
  • the hot melt adhesive composition in which the content of the plasticizer (D) is too low the solidification rate after heating and melting becomes too high, and the adhesiveness, particularly wet adhesiveness, may be lowered.
  • Antioxidants include 2,6-di-t-butyl-4-methylphenol, n-octadecyl-3- (4′-hydroxy-3 ′, 5′-di-t-butylphenyl) propionate, 2, 2′-methylenebis (4-methyl-6-tert-butylphenol), 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 2,4-bis (octylthiomethyl) -o-cresol, 2 -T-butyl-6- (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 2,4-di-t-amyl-6- [1- (3,5 -Di-t-amyl-2-hydroxyphenyl) ethyl] phenyl acrylate, 2- [1- (2-hydroxy-3,5-di-tert-pentylphenyl)] acrylate, tetrakis [m
  • UV absorber examples include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-t-butylphenyl) benzotriazole, 2- (2 ′ -Hydroxy-3 ', 5'-di-t-butylphenyl) -5-chlorobenzotriazole and other benzotriazole ultraviolet absorbers; 2-hydroxy-4-methoxybenzophenone and other benzophenone ultraviolet absorbers; salicylic acid ester Examples include ultraviolet absorbers, cyanoacrylate ultraviolet absorbers; hindered amine light stabilizers. An ultraviolet absorber may be used individually by 1 type, and may use 2 or more types together.
  • filler examples include mica, calcium carbonate, kaolin, talc, titanium oxide, diatomaceous earth, urea resin, styrene beads, calcined clay, and starch.
  • the hot melt adhesive composition of the present invention is used for bonding various members such as a woven fabric, a nonwoven fabric, a tissue, an elastic member, and a polyolefin resin film.
  • the hot melt adhesive composition of the present invention has a hydrophilic property such as a porous base material (such as a tissue) made of a natural material such as a cellulose-based material or a cotton-based material, and a nonwoven fabric subjected to a hydrophilization treatment. Since it can exhibit excellent wet adhesion even to a porous substrate, it is suitably used for adhering constituent members in the production of water-absorbent articles.
  • the water absorbent article has a first constituent member, a second constituent member, and the hot melt adhesive composition of the present invention.
  • the first constituent member is bonded and integrated with the second constituent member by the hot melt adhesive composition.
  • at least one is a hydrophilic porous base material among a 1st structural member and a 2nd structural member.
  • the first constituent member and the second constituent member may be constituent members used in water-absorbent articles, for example, elastic members such as rubber, woven fabric, non-woven fabric, paper, polyolefin resin film, and A hydrophilic porous substrate is mentioned. These structural members may be used individually by 1 type, and may use 2 or more types together.
  • the hydrophilic porous substrate include a porous substrate made of cellulose or cotton and a porous substrate subjected to a hydrophilic treatment.
  • Examples of the porous substrate made of cellulose or cotton include tissue.
  • Examples of the porous substrate subjected to the hydrophilic treatment include nonwoven fabrics and woven fabrics subjected to the hydrophilic treatment.
  • Water-absorbent articles are intended to absorb body fluids such as blood, urine, sweat, pus, gastric juice, saliva, nasal secretion mucus, and other fluids.
  • Other liquids include water, beverages, and waste liquids.
  • Examples of water-absorbing articles include disposable diapers, sanitary napkins, panty liners, incontinence pads, portable toilets, portable waste disposal bags, animal waste disposal sheets, hospital gowns, surgical lab coats, wound dressings, first aids
  • Examples include adhesive bandages and freshness-preserving materials such as meat and fish. Among these, a paper diaper is preferable.
  • a paper diaper is basically composed of a liquid-impermeable back sheet made of a polyolefin resin film or the like, a liquid-permeable top sheet made of a nonwoven fabric or the like, and an absorbent body disposed therebetween.
  • the absorber is used with its surface covered with a water-absorbing paper such as a tissue.
  • the water-absorbent article employs a structure that prevents excrement from leaking out by fitting an elastic member such as rubber in a stretchable manner to fit around the wearer's legs and waist.
  • the hot-melt adhesive of the present invention is used to bond and integrate hydrophilic porous substrates such as tissues together with other hydrophilic porous substrates such as tissue and non-woven fabrics. It is suitably used for bonding and integrating the porous base material, or for bonding and integrating the hydrophilic porous base material such as tissue and other constituent members such as a polyolefin resin film and an elastic member.
  • the method for bonding and integrating the constituent members with the hot melt adhesive composition of the present invention is not particularly limited, and a known method can be used.
  • a method in which a hot-melt adhesive composition heated and melted is applied to one constituent member, the other constituent member is superimposed on the applied hot-melt adhesive composition, and then the components are pressure-bonded. Is used.
  • the heating and melting temperature of the hot melt adhesive composition is preferably 135 to 180 ° C.
  • the heating and melting temperature is generally set to 150 ° C. or higher.
  • the melt viscosity of the hot melt adhesive composition is rapidly increased and the fluidity is lowered.
  • the applied hot melt adhesive composition becomes hydrophilic such as nonwoven fabric or tissue. In some cases, it becomes difficult to flow into the pores of the porous substrate, and sufficient wet adhesion cannot be obtained with respect to the hydrophilic porous substrate.
  • the hot melt adhesive composition of the present invention can be easily applied with a low melt viscosity even at a relatively low temperature of 150.degree. Furthermore, the hot melt adhesive composition of the present invention is suppressed from rapidly solidifying with a decrease in temperature, and can maintain excellent fluidity even at a relatively low temperature. Therefore, even if the hot melt temperature of the hot melt adhesive composition during coating is less than 150 ° C., particularly 135 to 145 ° C. or the open time after coating is long, the hot melt adhesive composition The material flows into the pores of the hydrophilic porous substrate, and a sufficient contact area between the hot melt adhesive composition and the hydrophilic porous substrate is obtained. In contrast, excellent adhesive strength can be maintained.
  • the coating method of the hot melt adhesive composition that has been heated and melted is not particularly limited, and a known method is used.
  • a known method is used.
  • the hot melt adhesive composition of the present invention can be gradually solidified with a decrease in temperature after heating and melting. Therefore, even if the hot melt temperature of the hot melt adhesive composition is low or the time until the adherend is bonded to the coated hot melt adhesive composition becomes long, The adhesive composition can maintain excellent fluidity, and can easily flow into the pores of the compressed hydrophilic porous substrate.
  • the constituent members of the hot melt adhesive composition of the present invention are excellent. Adhesive strength can be maintained. Therefore, when the hot melt adhesive composition of the present invention is used for a water-absorbing article such as a paper diaper, leakage of urine and the like to the outside can be highly suppressed.
  • thermoplastic block copolymers (A1) to (A11), liquid rubbers (B1) to (B4), wax, and tackifying resin used in the production of the hot melt adhesive composition A detailed description of each of C1) to (C3), the plasticizers (D1) to (D2), and the antioxidant is given below.
  • Styrene-butadiene-styrene block copolymer (A6) [no polar group, styrene component content 35 wt%, weight average molecular weight (Mw) 100,000, product name “Asaprene T-438”, manufactured by Asahi Kasei Chemicals Corporation] Styrene-butadiene-styrene block copolymer (A7) [no polar group, styrene component content 45 wt%, weight average molecular weight (Mw) 70,000, manufactured by Asahi Kasei Chemicals Corporation, product name “Asaprene T-439”] Styrene-butadiene / butylene-styrene block copolymer (A8) [no polar group, styrene content 30% by weight, weight average molecular weight (Mw) 100,000, manufactured by Asahi Kasei Chemicals, product name “Tuftec P1500”] Styrene-but
  • SIS copolymer SIS copolymer
  • SBS copolymer styrene-butadiene-styrene block copolymer
  • the styrene-butadiene / butylene-styrene block copolymer is simply described as “SBBS copolymer”
  • the styrene-ethylene / propylene-styrene block copolymer is simply described as “SEPS copolymer”
  • styrene-ethylene / The butylene-styrene block copolymer was described simply as “SEBS copolymer”.
  • Liquid polybutadiene (B3) having a carboxylic acid anhydride group Liquid polybutadiene (B3) having a carboxylic acid anhydride group [Liquid rubber having a main chain made of polybutadiene and having a carboxylic acid anhydride group at the end or side chain of the main chain: Number average molecular weight (Mn) 31,000, 23 C., liquid at 1.01 ⁇ 10 5 Pa (1 atm), melting point 0 ° C.
  • Liquid polyisoprene (B4) [No polar group: Number average molecular weight (Mn) 54,000, liquid at 23 ° C., 1.01 ⁇ 10 5 Pa (1 atm), melting point 0 ° C. or less, manufactured by Kuraray Claprene LIR-50 "]
  • Polyethylene (PE) wax having a carboxylic acid anhydride group [number average molecular weight (Mn) 1,400, solid at 23 ° C., 1.01 ⁇ 10 5 Pa (1 atm), melting point 104 ° C., manufactured by Innospec, Product name “Viscowax 261”]
  • Phenol-based antioxidant product name “IRGANOX1010” manufactured by BASF)
  • Examples 1 to 14 and Comparative Examples 1 to 9 Thermoplastic block copolymers (A1) to (A11), liquid rubbers (B1) to (B4), waxes, tackifying resins (C1) to (C3), plasticizers (D1) to (D2), and After adding the antioxidant in the mixing amounts shown in Tables 1 and 2 into a stirring kneader equipped with a heating device, kneading while heating at 150 ° C. for 1 hour, hot melt adhesion An agent composition was produced.
  • test piece was stored for 24 hours in an atmosphere of 23 ° C. and 50% relative humidity, and immersed in water at 23 ° C. for 1 minute. Then, the test piece was taken out from water and the wet test piece was obtained by wiping off water. And about the test piece of the wet state, based on JISK6854, the T-type peeling test was done at the tensile rate of 100 mm / min, and adhesive strength (x10 ⁇ -2 > N / 20mm) was measured. The obtained adhesive strength is shown in the column of “Wet adhesive strength” in Tables 1 and 2.
  • Thermal stability 1 After the hot melt adhesive composition is melted by heating to 140 ° C., the degree of coloration of the hot melt adhesive composition before the heating test conforms to the color test method for chemical products specified in JIS K0071. The Gardner color number was measured. Next, 20 g of the hot melt adhesive composition is put in a glass bottle, put in a 190 ° C. hot air dryer without covering the glass bottle, and left for 72 hours, and then the degree of coloring of the hot melt adhesive composition The number of Gardner colors was measured according to the color test method for chemical products specified in JIS K0071. Tables 1 and 2 show the difference in Gardner color number before and after heating at 190 ° C.
  • Thermal stability 2 50 g of the hot-melt adhesive composition dissolved by heating the hot-melt adhesive composition to 140 ° C. is put in a glass jar and put in a 190 ° C. hot air dryer without covering the glass jar for one week. Then, the hot melt adhesive composition after the heating test was visually confirmed to check for the occurrence of gelation and carbonization.
  • “good” and “bad” are as follows. “Good”: Neither gelation nor carbonization occurred. “Bad”: Gelation or carbonization occurred.
  • the hot melt adhesive composition of the present invention is suitably used for water-absorbing articles for absorbing body fluids such as blood, urine, sweat, pus, gastric juice, saliva, and nasal secretion mucus.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Polymers & Plastics (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

La présente invention concerne une composition d'agent adhésif thermofusible qui est caractérisée en ce qu'elle comprend : 100 parties en poids d'un copolymère séquencé thermoplastique (A) comprenant au moins un constituant choisi dans le groupe constitué par un copolymère séquencé styrène-isoprène-styrène ayant une teneur en constituant styrène située dans la plage allant de 15 à 35 % en poids, un copolymère séquencé styrène-butadiène-styrène ayant une teneur en constituant styrène située dans la plage allant de 15 à 35 % en poids et un copolymère séquencé styrène-butadiène/butylène-styrène ayant une teneur en constituant styrène située dans la plage allant de 15 à 35 % en poids ; de 0,05 à 10 parties en poids d'un caoutchouc liquide (B) comprenant un groupe carboxyle et/ou un groupe anhydride d'acide carboxylique dans la molécule ; et une résine conférant une adhésivité (C).
PCT/JP2014/067955 2013-07-05 2014-07-04 Composition d'agent adhésif thermofusible, et article apte à absorber l'eau fabriqué à l'aide de celle-ci WO2015002308A1 (fr)

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Cited By (3)

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WO2018123665A1 (fr) * 2016-12-27 2018-07-05 横浜ゴム株式会社 Composition thermofusible
JPWO2021006330A1 (fr) * 2019-07-11 2021-01-14
EP3916053A1 (fr) 2020-05-27 2021-12-01 Bostik SA Composition adhésive thermofusible ayant une force de collage humide améliorée

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JP6544942B2 (ja) 2015-02-20 2019-07-17 ヘンケルジャパン株式会社 ホットメルト接着剤及び使い捨て製品
WO2018061865A1 (fr) 2016-09-28 2018-04-05 日本ゼオン株式会社 Procédé de fabrication de structure d'emballage
WO2018230210A1 (fr) * 2017-06-12 2018-12-20 株式会社Moresco Adhésif thermofusible
CN111148812A (zh) * 2017-10-03 2020-05-12 株式会社Moresco 粘合剂组合物
JP7356008B2 (ja) * 2019-10-03 2023-10-04 横浜ゴム株式会社 スチールコード接着用ゴム組成物及びコンベヤベルト
JP2022134662A (ja) * 2021-03-03 2022-09-15 住友ゴム工業株式会社 テニスボール用水性接着剤

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Publication number Priority date Publication date Assignee Title
WO2018123665A1 (fr) * 2016-12-27 2018-07-05 横浜ゴム株式会社 Composition thermofusible
US11149172B2 (en) 2016-12-27 2021-10-19 The Yokohama Rubber Co., Ltd. Hot melt composition
JPWO2021006330A1 (fr) * 2019-07-11 2021-01-14
WO2021006330A1 (fr) * 2019-07-11 2021-01-14 株式会社クラレ Polymère diène conjugué modifié et composition polymère contenant ledit polymère diène conjugué modifié
JP7289915B2 (ja) 2019-07-11 2023-06-12 株式会社クラレ 変性共役ジエン系重合体及び該変性共役ジエン系重合体を含む重合体組成物
US11884780B2 (en) 2019-07-11 2024-01-30 Kuraray Co., Ltd. Modified conjugated diene polymer and polymer composition including said modified conjugated diene polymer
EP3916053A1 (fr) 2020-05-27 2021-12-01 Bostik SA Composition adhésive thermofusible ayant une force de collage humide améliorée
WO2021239404A1 (fr) 2020-05-27 2021-12-02 Bostik Sa Composition d'adhésif thermofusible ayant une résistance améliorée au mouillé

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CN104411796A (zh) 2015-03-11
CN106753092B (zh) 2020-12-08
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CN106753092A (zh) 2017-05-31
JP5404958B1 (ja) 2014-02-05
JP2015028118A (ja) 2015-02-12

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