Classifications

• • 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
  • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
  • C09J11/08—Macromolecular additives
• • 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
• • 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
  • C09J191/00—Adhesives based on oils, fats or waxes; Adhesives based on derivatives thereof
  • C09J191/06—Waxes

Definitions

• the present invention relates to a hot melt adhesive for positioning absorbent articles.
• Absorbent articles are articles that are fixed to clothing such as underwear and underwear in order to absorb body fluids generated from the body such as menstrual blood, vaginal discharge, urine, sweat, etc., and are used when body fluids adhere to clothing. It is used to prevent discomfort caused by
• absorbent articles for example, sanitary napkins, urine absorbing liners, breast pads, sweat armpit pads, paper diapers, etc. are known. These absorbent articles use a positioning hot melt adhesive to prevent them from being displaced from clothing during use.
• the absorbent article may move from the attached position during use, and body fluids may adhere to clothing. Furthermore, if the peel strength of the positioning hot melt adhesive is insufficient, some of the hot melt adhesive may remain on the clothing (so-called "glue residue") when removing the absorbent article after use. There are cases.
• fragrances such as mint have been applied to absorbent articles from the viewpoint of aroma deodorization, refreshing sensation, etc. of absorbent articles. Since the fragrance is volatile, it penetrates into the hot melt adhesive and reduces the cohesive force of the hot melt adhesive. When the cohesive force of the hot melt adhesive decreases, the shape of the hot melt adhesive tends to change, the peel strength decreases, and the adhesive residue described above tends to occur.
• hot-melt adhesives for positioning absorbent articles are required to be able to stay in place on clothing during use, and to be able to be peeled off after use without leaving any adhesive residue on clothing.
• Patent Document 1 describes (A) a thermoplastic block copolymer which is a copolymer of a vinyl aromatic hydrocarbon and a conjugated diene compound, and (B) ⁇ -methyl.
• a hot melt adhesive containing a styrene resin is described, which has a storage modulus G' of 8.0 ⁇ 10 Pa to 5.0 ⁇ 10 4 Pa at 50° C. and an angular velocity of 10 rad/s. has been done.
• Patent Document 2 describes a hot melt adhesive having (A) a thermoplastic block copolymer which is a copolymer of a vinyl aromatic hydrocarbon and a conjugated diene compound, The copolymer contains (A1) an unhydrogenated triblock styrene isoprene block copolymer and (A2) an unhydrogenated styrene butadiene block copolymer, and (B) ⁇ -methyl
• a hot melt adhesive is described that does not contain a styrene resin in an amount of 5 parts by weight or more based on 100 parts by weight of the total weight of (A) and (B).
• the hot melt adhesives of Patent Documents 1 and 2 contain an ⁇ -methylstyrene resin
• the resin contains a volatile component, and there is a problem in that the odor thereof is unpleasant.
• Patent Documents 1 and 2 have problems that when stored for a long period of time in the presence of fragrances such as mint, the shape changes, there is a lot of adhesive residue, and the peel strength cannot be maintained. There is.
• the present invention has been made in view of the above, and provides a product that has little odor, has little change in shape, leaves little adhesive residue, and maintains excellent peel strength even when stored for a long period of time in the presence of fragrance.
• the purpose of the present invention is to provide a hot melt adhesive for positioning absorbent articles.
• clothing such as underwear and underwear to which the hot melt adhesive for positioning the absorbent article is attached is also referred to as "attached clothing”.
• the styrenic block copolymer (A) contains a styrenic block copolymer (A1) and a styrenic block copolymer (A2),
• the styrenic block copolymer (A1) is a styrene-isoprene-styrene block copolymer (SIS) and/or a styrene-butadiene-styrene block copolymer (SBS), and any of these copolymers , the styrene content is 40% by mass to 50% by mass, and the diblock content is less than 1% by mass
• the styrenic block copolymer (A2) is SIS and/or SBS,
• the content of the wax (C) is 1 to 40 parts by mass based on 100 parts by mass of the styrenic block copolymer (A), Hot melt adhesive for positioning absorbent articles.
• Item 2. Item 2. The hot melt adhesive for positioning absorbent articles according to item 1, wherein the wax (C) is at least one selected from the group consisting of ethylene vinyl acetate copolymer wax, paraffin wax, polyethylene wax, and polypropylene wax.
• Item 3. Item 3.
• the hot melt adhesive for positioning absorbent articles according to item 1 or 2 wherein the tackifying resin (B) contains a C5 hydrogenated petroleum resin.
• the hot melt adhesive for positioning absorbent articles of the present invention has low odor, shows little change in shape, leaves little adhesive residue, and maintains excellent peel strength even when stored for a long period of time in the presence of perfume. I can do it.
• the upper limit or lower limit of the numerical range of one step can be arbitrarily combined with the upper limit or lower limit of the numerical range of another step.
• the upper limit or lower limit of the numerical range may be replaced with a value shown in the Examples or a value that can be uniquely derived from the Examples.
• numerical values connected by " ⁇ " mean a numerical range that includes the numerical values before and after the " ⁇ " as lower and upper limits.
• a and/or B means “one of A and B” or “both A and B”, and specifically, “A", “B”, or “A and B”.
• room temperature means a temperature within the range of 20°C to 25°C.
• low temperature means a temperature of 5° C. or lower.
• Hot melt adhesive for positioning absorbent articles The hot melt adhesive of the present invention is used as an adhesive for positioning absorbent articles.
• the hot melt adhesive for positioning absorbent articles of the present invention has the following configurations (i) to (v): (i) Contains a styrenic block copolymer (A), a tackifying resin (B), a wax (C), and a liquid plasticizer (D). (ii)
• the styrenic block copolymer (A) contains a styrenic block copolymer (A1) and a styrenic block copolymer (A2).
• the styrenic block copolymer (A1) is a styrene-isoprene-styrene block copolymer (SIS) and/or a styrene-butadiene-styrene block copolymer (SBS), and further, these copolymers All of these have a styrene content of 40% by mass to 50% by mass, and a diblock content of less than 1% by mass.
• SIS styrene-isoprene-styrene block copolymer
• SBS styrene-butadiene-styrene block copolymer
• the styrenic block copolymer (A2) is SIS and/or SBS, and furthermore, each of these copolymers has a styrene content of 30% by mass to 39% by mass, and a diblock The content ratio is 55% by mass to 75% by mass.
• the content of wax (C) is 1 to 40 parts by mass based on 100 parts by mass of styrenic block copolymer (A).
• the hot melt adhesive for positioning absorbent articles of the present invention has the above-mentioned configurations (i) to (v), so that it has little odor and has excellent fragrance resistance (it can be used for a long period of time in the presence of fragrance). Even when stored, the shape changes little, there is little adhesive residue, and excellent peel strength can be maintained.
• the hot melt adhesive for positioning absorbent articles of the present invention has the following characteristics (a) to (e) by having the above-mentioned configurations (i) to (v): (a) Low odor (also referred to as "unpleasant odor"); (b) Even when stored in a high temperature environment for a long period of time (for example, stored at 50°C for 7 days) in the presence of a flavoring agent such as mint, the change in shape is small; (c) Even if the absorbent article is stored at room temperature for a long period of time (for example, stored at 23°C for 14 days) in the presence of fragrances such as mint, adhesive remains on the adhered clothing when the absorbent article is removed from the adhered clothing.
• the hot melt adhesive for positioning absorbent articles of the present invention having the above-mentioned configurations (i) to (v) may be simply referred to as “the present invention” or “the hot melt adhesive of the present invention”. .
• the hot melt adhesive of the present invention preferably does not contain ⁇ -methylstyrene resin in order to further reduce odor.
• not containing ⁇ -methylstyrene resin means that the hot melt adhesive does not substantially contain ⁇ -methylstyrene resin.
• the hot melt adhesive does not substantially contain ⁇ -methylstyrene resin means that the content of ⁇ -methylstyrene resin is preferably based on 100 parts by mass of the styrenic block copolymer (A). is 1 part by weight or less, more preferably 0.5 part by weight or less, even more preferably 0.1 part by weight or less, even more preferably 0.05 part by weight or less, particularly preferably 0.01 part by weight or less.
• the hot melt adhesive of the present invention contains no ⁇ -methylstyrene resin at all in order to further reduce odor. That is, in the present invention, it is most preferable that the content of the ⁇ -methylstyrene resin is 0 parts by mass based on 100 parts by mass of the styrenic block copolymer (A). In the present invention, it is most preferable to exclude hot melt adhesives containing ⁇ -methylstyrene resin.
• melt viscosity of the hot melt adhesive of the present invention at 160°C is preferably 1,000 to 4,000 mPa ⁇ s, more preferably 1,500 to 3,500 mPa ⁇ s, and 1,800 to 3,200 mPa ⁇ s. -s is even more preferred.
• melt viscosity refers to the viscosity of a hot melt adhesive that has been heated to a molten state at a constant temperature.
• the hot melt adhesive of the present invention contains a styrenic block copolymer (A).
• the styrenic block copolymer (A) is a block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene compound.
• Vinyl aromatic hydrocarbon means an aromatic hydrocarbon compound having a vinyl group.
• vinyl aromatic hydrocarbons include styrene, o-methylstyrene, p-methylstyrene, p-tert-butylstyrene, 1,3-dimethylstyrene, vinylnaphthalene, vinylanthracene, and the like. These vinyl aromatic hydrocarbons can be used alone or in combination of two or more. Among these vinyl aromatic hydrocarbons, styrene is preferred.
• a conjugated diene compound means a diolefin compound having at least one pair of conjugated double bonds.
• the conjugated diene compound include 1,3-butadiene, 2-methyl-1,3-butadiene (isoprene), 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, and 1,3-hexadiene. etc.
• These conjugated diene compounds can be used alone or in combination of two or more.
• 1,3-butadiene and isoprene are preferred.
• the styrenic block copolymer (A) contains a styrenic block copolymer (A1) and a styrenic block copolymer (A2).
• the main components of the styrenic block copolymer (A) are a styrenic block copolymer (A1) and a styrenic block copolymer (A2).
• the main components of the styrenic block copolymer (A) are the styrenic block copolymer (A1) and the styrenic block copolymer (A2) in the styrenic block copolymer (A).
• the mass ratio is usually more than 50% by mass, preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 99% by mass or more, particularly preferably 100% by mass. means.
• the styrenic block copolymer (A) substantially consists of a styrenic block copolymer (A1) and a styrenic block copolymer (A2).
• “consisting essentially” means that the inclusion of unavoidable impurities in addition to the listed components is allowed.
• the styrenic block copolymer (A1) is a styrene-isoprene-styrene block copolymer (SIS) and/or a styrene-butadiene-styrene block copolymer (SBS);
• the styrene content is 40% by mass to 50% by mass, and the diblock content is less than 1% by mass.
• the lower limit of the styrene content is preferably 41% by mass, more preferably 42% by mass, even more preferably 43% by mass, particularly preferably 44% by mass.
• the styrenic block copolymer (A1) is preferably SIS or SBS, more preferably SIS.
• the lower limit of the diblock content is preferably 0% by mass, more preferably more than 0% by mass.
• the fragrance resistance decreases (particularly, the peeling strength cannot be maintained).
• the styrene content in the styrenic block copolymer (A1) is less than 40% by mass and the diblock content is less than 1% by mass, the fragrance resistance decreases (especially, There will be a lot of glue residue).
• the styrenic block copolymer (A1) is SIS or SBS, and each of these copolymers has a styrene content of 40% by mass to 50% by mass, and a diblock content of 40% by mass to 50% by mass. is preferably less than 1% by mass.
• the lower limit of the styrene content is preferably 41% by mass, more preferably 42% by mass, even more preferably 43% by mass, particularly preferably 44% by mass.
• the lower limit of the diblock content is preferably 0% by mass, more preferably more than 0% by mass.
• the styrenic block copolymer (A1) is SIS, and it is more preferable that the styrene content of the SIS is 40% by mass to 50% by mass, and the diblock content is less than 1% by mass.
• the lower limit of the styrene content of the SIS is preferably 41% by mass, more preferably 42% by mass, even more preferably 43% by mass, particularly preferably 44% by mass.
• the lower limit of the diblock content is preferably 0% by mass, more preferably more than 0% by mass.
• styrenic block copolymer (A1) a wide variety of known commercially available products can be used.
• the styrenic block copolymer (A2) is SIS and/or SBS, and furthermore, each of these copolymers has a styrene content of 30% by mass to 39% by mass, and a diblock The content ratio is 55% by mass to 75% by mass.
• the lower limit of the styrene content is preferably 31% by mass, more preferably 32% by mass, even more preferably 34% by mass, particularly preferably 35% by mass.
• the upper limit of the diblock content is preferably 72% by mass, more preferably 70% by mass, even more preferably 68% by mass, particularly preferably 66% by mass.
• the styrenic block copolymer (A2) is preferably SIS or SBS, more preferably SBS.
• fragrance resistance decreases.
• the styrene content in the styrenic block copolymer (A2) exceeds 39% by mass and the diblock content is less than 55% by mass
• fragrance resistance decreases.
• the styrene content in the styrenic block copolymer (A2) is 30% by mass or more and 39% by mass or less, and the diblock content exceeds 75% by mass, fragrance resistance will decrease. (In particular, the shape change becomes large).
• the styrenic block copolymer (A2) is SIS or SBS, and each of these copolymers has a styrene content of 30% by mass to 39% by mass, and a diblock content of 30% by mass to 39% by mass. is preferably 55% to 75% by mass.
• the lower limit of the styrene content is preferably 31% by mass, more preferably 32% by mass, even more preferably 34% by mass, particularly preferably 35% by mass.
• the upper limit of the diblock content is preferably 72% by mass, more preferably 70% by mass, even more preferably 68% by mass, and particularly preferably 66% by mass.
• the styrenic block copolymer (A2) is SBS, and the styrene content of SBS is 30% by mass to 39% by mass, and the diblock content is More preferably, it is 55% by mass to 75% by mass.
• the lower limit of the styrene content of SBS is preferably 31% by mass, more preferably 32% by mass, even more preferably 34% by mass, particularly preferably 35% by mass.
• the upper limit of the diblock content of SBS is preferably 72% by mass, more preferably 70% by mass, even more preferably 68% by mass, and particularly preferably 66% by mass.
• the styrene content (% by mass) in a styrenic block copolymer refers to the content (% by mass) of styrene blocks in the styrenic block copolymer.
• methods for measuring the styrene content in a styrenic block copolymer include, for example, proton nuclear magnetic resonance method (1H-NMR method) according to JIS K 6239-1:2017 and red A method using external spectroscopy (IR method) can be mentioned.
• the styrene block is a block containing units having a structure obtained by polymerizing styrene.
• a method for measuring the diblock content in a styrenic block copolymer for example, a method using gel permeation chromatography (GPC) can be mentioned.
• the measurement conditions for gel permeation chromatography are not particularly limited, but for example, using Waters' product name "ACQUITY APC" as a measuring device, the diblock content ratio in the styrenic block copolymer was measured under the following measurement conditions. can be measured.
• diblock means a copolymer consisting of a styrene block and a conjugated diene block (also referred to as a "styrene-conjugated diene block copolymer").
• a conjugated diene block is a block containing a unit having a structure obtained by polymerizing a conjugated diene compound. Examples of the conjugated diene compound include 1,3-butadiene, 2-methyl-1,3-butadiene (isoprene), 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, and 1,3-hexadiene. etc. These conjugated diene compounds can be used alone or in combination of two or more.
• the total styrene content in the hot melt adhesive of the present invention is preferably 8.5% by mass to 10.5% by mass.
• methods for measuring the total styrene content include, for example, proton nuclear magnetic resonance method (1H-NMR method) according to JIS K 6239-1:2017 and infrared spectroscopy (IR method) using a cast film. ).
• the styrenic block copolymer (A1) and the styrenic block copolymer (A2) are 100 parts by mass, the styrenic block copolymer (A1) and the styrenic block copolymer
• the mass ratio with (A2) [mass of styrenic block copolymer (A1):mass of styrenic block copolymer (A2)] is preferably 20:80 to 60:40, and 25:75 to 55: 45 is more preferable, and 30:70 to 50:50 is even more preferable.
• the content of the styrenic block copolymer (A) in 100% by mass of the hot melt adhesive of the present invention is preferably 10% to 40% by mass, more preferably 15% to 35% by mass, even more preferably 20% by mass.
• the amount is preferably 24% to 29% by weight, more preferably 24% to 29% by weight.
• the hot melt adhesive of the present invention contains a tackifying resin (B).
• the tackifier resin (B) include rosin compounds, terpene compounds, petroleum resins, and the like. These tackifier resins (B) can be used alone or in combination of two or more. Among these tackifier resins (B), petroleum resins are preferred, and hydrogenated petroleum resins are particularly preferred.
• rosin-based compounds include natural rosin, modified rosin, esterified product of natural rosin (rosin ester resin), glycerol ester of natural rosin, glycerol ester of modified rosin, pentaerythritol ester of natural rosin, and pentaerythritol ester of modified rosin. etc. These can be used alone or in combination of two or more.
• the rosin compound is preferably a rosin ester resin.
• terpene compound examples include copolymers of natural terpenes, three-dimensional polymers of natural terpenes, hydrogenated derivatives of copolymers of natural terpenes, terpene resins, and hydrogenated derivatives of phenolic modified terpene resins. These can be used alone or in combination of two or more.
• Examples of petroleum resins include C5 petroleum resins, C9 petroleum resins, C5C9 petroleum resins, dicyclopentadiene (DCPD) petroleum resins, DCPDC9 petroleum resins, and partially hydrogenated petroleum resins obtained by adding hydrogen to these petroleum resins. Examples include petroleum resins and fully hydrogenated petroleum resins. These petroleum resins can be used alone or in combination of two or more.
• C5-based petroleum resin is a petroleum resin made from the C5 fraction of petroleum
• C9-based petroleum resin is a petroleum resin made from the C9 fraction of petroleum
• C5C9-based petroleum resin is a petroleum resin made from the C9 fraction of petroleum. It is a petroleum resin made from C5 fraction and C9 fraction.
• Examples of the C5 fraction include cyclopentadiene, isoprene, and pentane.
• Examples of the C9 fraction include styrene, vinyltoluene, indene, and the like.
• As the C9-based petroleum resin and the C5C9-based petroleum resin those containing styrene, which is a type of C9 fraction, in the skeleton are preferred.
• tackifier resin (B) petroleum resins are preferable in terms of the odor and thermal stability of hot melt adhesives, and C5 petroleum resins, C9 petroleum resins and C5C9 petroleum resins are preferred. More preferred are C5 hydrogenated petroleum resins, C9 hydrogenated petroleum resins and C5C9 hydrogenated petroleum resins.
• the tackifying resin (B) more preferably contains a C5-based hydrogenated petroleum resin and/or a rosin ester resin in terms of superiority in hot melt adhesive fragrance tests.
• the tackifier resin (B) is at least one selected from the group consisting of a C5 hydrogenated petroleum resin, a C9 hydrogenated petroleum resin, a C5C9 hydrogenated petroleum resin, and a rosin ester resin. It is preferable to contain a C5-based hydrogenated petroleum resin and a C9-based hydrogenated petroleum resin, and it is more preferable to contain a C5-based hydrogenated petroleum resin, a C9-based hydrogenated petroleum resin, and a C5C9-based hydrogenated petroleum resin. It is even more preferable to contain a C5 hydrogenated petroleum resin, a C9 hydrogenated petroleum resin, a C5C9 hydrogenated petroleum resin, and a rosin ester resin.
• the content of the tackifier resin (B) is preferably 150 to 300 parts by mass, more preferably 160 to 285 parts by mass, and even more preferably The amount is preferably 170 to 260 parts by weight, more preferably 180 to 240 parts by weight.
• the content of the tackifying resin (B) in 100% by mass of the hot melt adhesive of the present invention is preferably 40 to 70% by mass, more preferably 45 to 65% by mass, even more preferably 50 to 60% by mass. be.
• the tackifying resin (B) contains a C5 hydrogenated petroleum resin, a C9 hydrogenated petroleum resin, and a C5C9 hydrogenated petroleum resin
• the content of the C5C9 hydrogenated petroleum resin is It is preferably 10 to 35 parts by weight, more preferably 15 to 30 parts by weight, based on 100 parts by weight of the total weight of the added petroleum resin and C9 hydrogenated petroleum resin.
• tackifying resin (B) As the tackifying resin (B), a wide variety of known commercially available products can be used. Commercially available products include, for example, the product name "Arkon M100” manufactured by Arakawa Chemical Co., Ltd., which is a C9-based hydrogenated petroleum resin, and the product name "Easttac C100L", manufactured by Eastman Chemical Co., which is a C5-based hydrogenated petroleum resin. Examples include “Rigalite C8010", a C5C9-based hydrogenated petroleum resin manufactured by Eastman Chemical Co., and "KOMOTACK KS2100", a rosin ester resin manufactured by Guangdong KOMO Corporation.
• the hot melt adhesive of the present invention contains wax (C).
• the content of the wax (C) is 1 to 40 parts by weight based on 100 parts by weight of the styrenic block copolymer (A). If the content of wax (C) exceeds 40 parts by mass based on 100 parts by mass of the styrenic block copolymer (A), the tack of the surface of the hot melt adhesive will decrease, resulting in poor fragrance resistance (especially peeling). strength) decreases significantly.
• the content of wax (C) is preferably 4 to 35 parts by mass, more preferably The amount is from 6 to 30 parts by weight, even more preferably from 8 to 25 parts by weight, particularly preferably from 10 to 20 parts by weight.
• the reason why fragrance resistance is improved by containing the wax (C) is not clear, but it is presumed as follows. That is, in the present invention, by containing the wax (C), a wax layer is formed on the surface of the hot melt adhesive, thereby preventing aromatic components contained in the fragrance from entering the hot melt adhesive. be able to.
• the softening of the styrene domain of the styrenic block copolymer (A) contained in the hot melt adhesive of the present invention is suppressed, and the cohesive force of the hot melt adhesive is improved, resulting in improved fragrance resistance. Guessed.
• the content of wax (C) in 100% by mass of the hot melt adhesive of the present invention is preferably 0.4 to 10% by mass, more preferably 0.6 to 8% by mass, and even more preferably 0.8 to 10% by mass.
• the amount is 6% by weight, more preferably 1 to 4% by weight.
• wax (C) examples include mineral waxes such as paraffin wax and microcrystalline wax; polyolefin waxes such as polyethylene wax, polypropylene wax, and Fischer-Tropsch wax; and vinyl acetate wax such as ethylene vinyl acetate copolymer (EVA) wax. Examples include wax. These waxes (C) can be used alone or in combination of two or more.
• the wax (C) is preferably at least one selected from the group consisting of ethylene vinyl acetate copolymer wax, paraffin wax, polyethylene wax, and polypropylene wax, from the viewpoint of further improving fragrance resistance; At least one selected from the group consisting of vinyl copolymer wax, paraffin wax, and polypropylene wax is more preferred.
• the wax (C) is an ethylene-vinyl acetate copolymer wax, since the fragrance resistance is further improved.
• the wax (C) a wide variety of known commercially available products can be used as the wax (C).
• Commercially available products include, for example, ethylene vinyl acetate copolymer wax “AC400” manufactured by Honeywell, paraffin wax “SN-9” manufactured by Nippon Seirin Co., Ltd., and polypropylene wax manufactured by Licosene.
• the product name is "PP6102" manufactured by Manufacturer.
• liquid plasticizer means having fluidity at room temperature (for example, 25° C.) (that is, changing its shape to match the container when placed in a container).
• liquid plasticizer (D) examples include polybutene, paraffinic process oil, naphthenic process oil, aromatic process oil, liquid paraffin, hydrocarbon synthetic oil, and the like. Among these, at least one of polybutene and process oil is preferred. Further, as the process oil, at least one of paraffinic process oil and naphthenic process oil is more preferable. In the present invention, the liquid plasticizer (D) is more preferably a paraffinic process oil and/or a naphthenic process oil in order to further improve the adhesiveness of the hot melt adhesive.
• liquid plasticizers (D) can be used alone or in combination of two or more.
• polybutene examples include homopolymers of isobutene, copolymers of isobutene and n-butene, and the like.
• polybutene As the polybutene, a wide variety of known commercially available products can be used. Commercially available products include, for example, the product name "10N” manufactured by NOF Corporation, the product name "Indopol H-100” manufactured by Ineos, the product name “Nisseki Polybutene” manufactured by Nippon Petrochemical, and the product name “Nisseki Polybutene” manufactured by Nippon Petrochemical. Examples include the product name ⁇ Tetrax'' manufactured by Manufacturer.
• paraffinic process oil As the paraffinic process oil, a wide variety of known commercially available products can be used. Commercially available products include, for example, the product name "PW-32" manufactured by Idemitsu Kosan, the product name “Diana Fresia S32” manufactured by Idemitsu Kosan, the product name "PS-32” manufactured by Idemitsu Kosan, and the product name "PS-32” manufactured by Idemitsu Kosan. Examples include the product name "PW-90".
• aromatic process oil a wide variety of known commercially available products can be used.
• Commercially available products include, for example, the product name "Aromax” manufactured by Nippon Oil Co., Ltd.
• liquid paraffin As the liquid paraffin, a wide variety of known commercially available products can be used. Commercially available products include the product name "P-100” manufactured by MORESCO and the product name "Kaydol” manufactured by Sonneborn.
• hydrocarbon synthetic oil As the hydrocarbon synthetic oil, a wide variety of known commercially available products can be used. Commercially available products include "Lucant HC-10” manufactured by Mitsui Chemicals, "Lucant HC-20” manufactured by Mitsui Chemicals, and the like.
• the content of the liquid plasticizer (D) in 100% by mass of the hot melt adhesive of the present invention is preferably 8 to 30% by mass, more preferably 10 to 28% by mass, even more preferably 12 to 26% by mass, More preferably, it is 15 to 24% by mass.
• the content of the liquid plasticizer (D) is preferably 35 to 95 parts by mass based on 100 parts by mass of the styrenic block copolymer (A). Parts by weight, more preferably 40 to 90 parts by weight, even more preferably 45 to 85 parts by weight, particularly preferably 50 to 80 parts by weight.
• the former:latter ratio is particularly preferably 60:9 to 60:13.
• the content of the liquid plasticizer (D) is preferably 65 to 65 parts by mass based on 100 parts by mass of the styrenic block copolymer (A).
• the amount is 90 parts by mass, more preferably 75 to 80 parts by mass.
• the hot melt adhesive of the present invention may contain an antioxidant (E). Antioxidants are used to prevent oxidative deterioration of hot melt adhesives.
• antioxidant (E) examples 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-t-butylphenol), 2,2'-methylenebis(4-ethyl-6-t-butylphenol), 2,4-bis(octylthiomethyl)- o-Cresol, 2-t-butyl-6-(3-t-butyl-2-hydroxy-5-methylbenzyl)-4-methylphenylacrylate, 2,4-di-t-amyl-6-[1 -(3,5-di-t-amyl-2-hydroxyphenyl)ethyl]phenylacrylate, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)]acrylate, tetrakis[methylene- Hinderedered
• the content of the antioxidant (E) is preferably 0.00 parts by mass based on 100 parts by mass of the styrenic block copolymer (A) in order to further improve the thermal stability of the hot melt adhesive during melting.
• the amount is 1 to 10 parts by weight, more preferably 0.5 to 8 parts by weight, even more preferably 1.0 to 6 parts by weight, particularly preferably 1.5 to 5 parts by weight.
• antioxidant In the present invention, a wide variety of known commercial products can be used as the antioxidant (E). Examples of commercially available products include the product name "Evernox 10" manufactured by EVERSPRING CHEMICAL, and the product name "IRGANOX 1010" manufactured by BASF.
• the hot melt adhesive of the present invention may contain various additives as necessary.
• various additives include ultraviolet absorbers, fine particle fillers, and the like. UV absorbers are used to improve the light resistance of hot melt adhesives.
• UV absorber a wide range of known ultraviolet absorbers can be used, such as 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-t Benzotriazole UV absorbers such as -butylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-t-butylphenyl)-5-chlorobenzotriazole, 2-hydroxy-4-methoxy
• UV absorbers such as -butylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-t-butylphenyl)-5-chlorobenzotriazole, 2-hydroxy-4-methoxy
• UV absorbers such as -butylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-t-butylphenyl)-5-chlorobenzotriazole, 2-hydroxy-4-methoxy
• particulate filler a wide variety of known particulate fillers can be used, such as calcium carbonate, kaolin, talc, titanium oxide, mica, styrene beads, and the like. These particulate fillers can be used alone or in combination of two or more.
• the content of the above additive in 100% by mass of the hot melt adhesive of the present invention is preferably 10% by mass or less, more preferably 5% by mass or less.
• Method for producing hot melt adhesive for positioning absorbent articles The method for producing the hot melt adhesive of the present invention is not particularly limited.
• C a method in which liquid plasticizer (D), antioxidant (E), and various additives added as necessary are placed in a stirring kneader equipped with a heating device and kneaded while heating. can be mentioned.
• the heating temperature during kneading is not particularly limited, and is preferably 100 to 200°C, more preferably 120 to 180°C.
• the kneading time is not particularly limited, and is preferably 40 to 140 minutes, more preferably 60 to 120 minutes.
• the raw materials used in the examples and comparative examples are as follows.
• Example and comparative example The above-mentioned raw materials, in the amounts shown in Table 1, were put into a stirring kneader equipped with a heating device, then kneaded while heating at 150 ° C. for 90 minutes, and cooled until solid. A hot melt adhesive was produced. In addition, all the numerical values of each raw material in Table 1 mean "parts by mass.”
• melt viscosity measurement test The hot-melt adhesive was heated and melted, and in accordance with the Japan Adhesive Industry Association standard JAI-7, using a Brookfield RVF viscometer and thermocell, spindle No. The melt viscosity (mPa ⁇ s) of each hot melt adhesive at 160° C. was measured using No. 27 at a rotation speed of 20 rpm. The measurement results are shown in Table 1, "Melt viscosity at 160°C (mPa ⁇ s)".
• the numerical value of the odor level was set based on the sense of the subject and according to the following evaluation criteria. ⁇ Evaluation criteria> 1: I didn't smell anything (it was odorless) 2: I could sense a faint odor 3: I could sense what kind of smell it was 4: I felt a strong odor 5: I felt a strong pungent odor
• the average value of the odor level of 10 subjects was calculated, and the odor of the hot melt adhesive was evaluated according to the following evaluation criteria.
• the horizontal distance between the starting point and the ending point was 3. 4: The horizontal distance between the start point and the end point was 3.0 mm or more and less than 3.5 mm. 5: The horizontal distance between the start point and the end point was 2.5 mm or more and less than 3.0 mm. 6: The horizontal distance between the starting point and the ending point was 2.0 mm or more and less than 2.5 mm. 7: The horizontal distance between the starting point and the ending point was 1.5 mm or more and less than 2.0 mm. 8: The horizontal distance between the starting point and the ending point was 1.5 mm or more and less than 2.0 mm.
• the horizontal distance was 1.0 mm or more and less than 1.5 mm 9: The horizontal distance between the start point and the end point was 0.5 mm or more and less than 1.0 mm 10: The horizontal distance between the start point and the end point was 0.0 mm or more and 0 It was less than .5mm
• Test piece 1 (Fragrance resistance test 1: room temperature peel strength) 4 lines of each hot melt adhesive molded to a thickness of 30 ⁇ m and a width of 3.6 mm are applied to release paper at 1.5 mm intervals, and then bonded to a polyethylene film (base material) and molded to a length of 70 mm and a width of 25 mm. Test piece 1 was prepared in this manner.
• a diluted solution was prepared by diluting 0.01 g of peppermint oil (manufactured by Taiyo Seiyaku Co., Ltd.) with 0.3 mL/p of acetone (solvent) in an amount sufficient to wet a nonwoven fabric measuring 70 mm long and 25 mm wide.
• mL/p means the amount of moisture per nonwoven fabric (one piece).
• a nonwoven fabric measuring 70 mm long and 25 mm wide was soaked in the diluted solution and dried at 23° C. for 1 hour. The dried nonwoven fabric was attached to the side opposite to the adhesive layer attachment side of the polyethylene film of Test Piece 1, and sandwiched between glass plates.
• the prepared test piece 2 and a cotton cloth for JIS dyeing fastness test (Kanakin No. 3: simulated adhered clothing) conforming to JIS L 0803 were cured for 30 minutes in a 23°C environment, and then heated at 300 mm/min using a 2 kg roller. It was pasted together by going back and forth at a speed of . Thereafter, the test piece 2 was peeled in a direction of 180° C. at a tensile rate of 300 mm/min in an atmosphere of 23° C., and the peel strength (N/25 mm) was measured.
• the measured value of peel strength (N/25 mm) was evaluated according to the following evaluation criteria ( ⁇ or ⁇ is a pass, and these evaluations indicate that the fixation to the simulated clothing is good and that slipping is effectively prevented. ).
• ⁇ Evaluation criteria> ⁇ : Peel strength (N/25mm) was 2.0 or more and 3.5 or less ⁇ : Peel strength (N/25mm) was 1.0 or more and less than 2.0 ⁇ : Peel strength (N/25mm) ) was 0.5 or more and less than 1.0 ⁇ : Peel strength (N/25mm) was 0 or more and less than 0.5
• a diluted solution was prepared by diluting 0.01 g of peppermint oil (manufactured by Taiyo Seiyaku Co., Ltd.) with 0.3 mL/p of acetone (solvent) in an amount sufficient to wet a nonwoven fabric measuring 70 mm long and 25 mm wide.
• a nonwoven fabric measuring 70 mm long and 25 mm wide was soaked in the diluted solution and dried at 23° C. for 1 hour. The dried nonwoven fabric was attached to the side opposite to the adhesive layer attachment side of the polyethylene film of Test Piece 1, and sandwiched between glass plates.
• the prepared test piece 2 and a cotton cloth for JIS dyeing fastness test (Kanakin No. 3: simulated adhered clothing) conforming to JIS L 0803 were bonded together at 23°C, and then bonded to a glass plate at 40°C.
• the sample was sandwiched between the tubes and cured for 2 hours at 40° C. under a load of 2 kg. Thereafter, the temperature was returned to 23° C. in the bonded state, and then the test piece 2 was peeled off in the 180° C. direction at a tensile rate of 500 mm/min.
• Test piece 1 was prepared in this manner.
• a diluted solution was prepared by diluting 0.01 g of peppermint oil (manufactured by Taiyo Seiyaku Co., Ltd.) with 0.3 mL/p of acetone (solvent) in an amount sufficient to wet a nonwoven fabric measuring 70 mm long and 25 mm wide.
• mL/p means the amount of moisture per nonwoven fabric (one piece).
• a nonwoven fabric measuring 70 mm long and 25 mm wide was soaked in the diluted solution and dried at 23° C. for 1 hour. The dried nonwoven fabric was attached to the side opposite to the adhesive layer attachment side of the polyethylene film of Test Piece 1, and sandwiched between glass plates.
• the prepared test piece 2 and a cotton fabric for JIS dyeing fastness test (Kanakin No. 3: simulated adhered clothing) conforming to JIS L 0803 were cured for 30 minutes in a 5°C environment, and then heated at 300 mm/min using a 2 kg roller. It was pasted together by going back and forth at a speed of . Thereafter, the test piece 2 was peeled in a direction of 180° C. at a tensile rate of 300 mm/min in an atmosphere of 5° C., and the peel strength (N/25 mm) was measured.
• the measured value of peel strength (N/25 mm) was evaluated according to the following evaluation criteria ( ⁇ , ⁇ , or ⁇ is a pass, and these evaluations indicate that the fixation to the simulated clothing is good and does not shift. (can be effectively suppressed).
• ⁇ Evaluation criteria> ⁇ : Peel strength (N/25mm) was 2.0 or more and 3.5 or less ⁇ : Peel strength (N/25mm) was 1.0 or more and less than 2.0 ⁇ : Peel strength (N/25mm) ) was 0.3 or more and less than 1.0 ⁇ : Peel strength (N/25mm) was 0 or more and less than 0.3
• Table 1 shows the results of each Example and each Comparative Example.

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• Adhesives Or Adhesive Processes (AREA)
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• 2023
  • 2023-04-19 JP JP2024517231A patent/JPWO2023210453A1/ja active Pending
  • 2023-04-19 WO PCT/JP2023/015537 patent/WO2023210453A1/ja not_active Ceased

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