Hot melt adhesive composition, pre-coat surface material for automotive interiors, automotive interior material, and method for manufacturing adhesives.

Abstract

To provide a hot-melt adhesive that has good adhesiveness to resin base materials, especially polyolefin base materials such as polypropylene, and also has workability (mold releasability) that allows easy release from a mold.SOLUTION: Provided is a hot-melt adhesive composition that contains a crystalline polyolefin (A) having a Shore A hardness of 80 or more, an amorphous polyolefin (B), and a polypropylene wax (C). The amount of the polypropylene wax (C) is 60 pts.wt. or more to 300 pts.wt. or less based on the total 100 pts.wt. of the crystalline polyolefin (A) and the amorphous polyolefin (B).SELECTED DRAWING: None

Description

[Technical Field] 【0001】 This disclosure relates to a hot-melt adhesive composition, a pre-coat surface material for automotive interiors using the same, and automotive interior materials. [Background technology] 【0002】 Hot-melt adhesives are solid at room temperature. They are heated and melted, applied to a substrate, and then bonded together by cooling and solidifying. Compared to solvent-based adhesives, hot-melt adhesives offer advantages such as reduced VOCs and improved productivity due to the elimination of the drying process. They are used in various applications, such as in automobile manufacturing. 【0003】 Patent Document 1 discloses a hot-melt adhesive composition comprising a hydrocarbon-based cyclic polymer, an α-olefin-based polymer, and a tackifying resin. 【0004】 Patent Document 2 discloses a hot-melt adhesive composition comprising an α-olefin copolymer polymerized using a multi-site catalyst, an α-olefin copolymer polymerized using a single-site catalyst, an ethylene-polar group-containing monomer copolymer, a hydrogenated tackifying resin, and a polypropylene-based wax in specific proportions. [Prior art documents] [Patent Documents] 【0005】 [Patent Document 1] WO2018 / 012593 [Patent Document 2] WO2018 / 100672 [Overview of the Initiative] [Problems that the invention aims to solve] 【0006】 When using hot-melt adhesives, depending on the type of bonding method, a step is required to remove the hot-melt adhesive from the mold (for example, vacuum forming). Patent documents 1 and 2 do not address the step of removing hot-melt adhesive from the mold. Conventional hot-melt adhesives take time to solidify from a molten state, and during that time, they cannot be easily removed from the mold, which can result in poor workability. Furthermore, when using conventional hot-melt adhesives, residual adhesive remains after removal from the mold, requiring manual removal and cleaning, which can also be problematic from a workability standpoint. 【0007】 Therefore, the present disclosure aims to provide a hot melt adhesive that has good adhesion to resin substrates, particularly polyolefin substrates including polypropylene, and also has good workability (mold release properties) that allows it to be easily peeled off the mold. [Means for solving the problem] 【0008】 In other words, this disclosure includes the following: [Section 1] Crystalline polyolefin (A) having a Shore A hardness of 80 or higher, Amorphous polyolefin (B) and Polypropylene-based wax (C) Includes, A hot-melt adhesive composition in which the amount of polypropylene-based wax (C) is 60 parts by weight or more and 300 parts by weight or less per 100 parts by weight of the total amount of crystalline polyolefin (A) and amorphous polyolefin (B). [Section 2] The hot melt adhesive composition according to item 1, wherein the melting point of the crystalline polyolefin (A) is 80°C or higher. [Section 3] The hot melt adhesive composition according to claim 1 or 2, wherein the crystalline polyolefin (A) comprises an ethylene-propylene copolymer. [Section 4] The hot-melt adhesive composition according to any one of Items 1 to 3, wherein the softening point of the amorphous polyolefin (B) is 100°C or higher. [Item 5] The hot-melt adhesive composition according to any one of Items 1 to 4, wherein the amorphous polyolefin (B) contains at least one selected from the group consisting of a binary copolymer of ethylene and propylene and a terpolymer of ethylene, propylene and butene. [Item 6] The hot-melt adhesive composition according to any one of Items 1 to 5, wherein the softening point of the polypropylene-based wax (C) is 130°C or higher. [Item 7] The hot-melt adhesive composition according to any one of Items 1 to 6, containing a tackifier (D). [Item 8] The hot-melt adhesive composition according to Item 7, wherein the softening point of the tackifier (D) is 90°C or higher. [Item 9] The hot-melt adhesive composition according to Item 7, wherein the tackifier (D) contains at least one selected from the group consisting of a hydrogenated petroleum resin, a terpene resin, and a terpene phenol resin. [Item 10] The hot-melt adhesive composition according to any one of Items 1 to 9, containing an antioxidant (E). [Item 11] The hot-melt adhesive composition according to any one of Items 1 to 10, containing an inorganic filler (F). [Item 12] The hot-melt adhesive composition according to any one of Items 1 to 11, containing an elastomer (G). [Item 13] The hot-melt adhesive composition according to any one of Items 1 to 12, having a melt viscosity at 180°C of 15,000 mPa·s or more and 100,000 mPa·s or less. [Item 14] The hot-melt adhesive composition according to any one of Items 1 to 13, which is for automotive interior materials. [Item 15] An automotive interior surface material, and a pre-coated surface material for automotive interiors, comprising a hot-melt adhesive layer formed from the hot-melt adhesive composition according to any one of items 1 to 14 on the back surface of the previous automotive interior surface material. [Item 16] An automotive interior trim, comprising an automotive interior molded product and the pre-coated surface material for automotive interiors according to item 15, which is adhered to the automotive molded product through the hot-melt adhesive layer. [Item 17] A method for manufacturing an adherent, The adherent has a first substrate and a second substrate adhered to the first substrate through a hot-melt adhesive layer formed from the hot-melt adhesive composition according to any one of items 1 to 14. A method for manufacturing an adherent, comprising a step of bringing a mold into contact with the hot-melt adhesive composition. 【Advantages of the Invention】 【0009】 The hot-melt adhesive of the present disclosure has good adhesiveness particularly to polyolefin substrates such as polypropylene, and also has good mold release properties, and is excellent in workability. 【Modes for Carrying Out the Invention】 【0010】 <Hot-Melt Adhesive Composition> The hot-melt adhesive composition of the present disclosure contains a crystalline polyolefin (A), an amorphous polyolefin (B), and a polypropylene-based wax (C). In addition to (A) to (C), the hot-melt adhesive composition of the present disclosure may further contain one or more selected from tackifiers (D), antioxidants (E), inorganic fillers (F), elastomers (G), plasticizers (H), and other additives as necessary. 【0011】 [(A) Crystalline Polyolefin] The hot-melt adhesive compositions of this disclosure contain a crystalline polyolefin (A). The crystalline polyolefin (A) is a polyolefin having high crystallinity. The crystalline polyolefin (A) is distinguished from other components described herein in terms of crystallinity, Shore A hardness, and / or molecular weight. Typically, the crystallinity of the crystalline polyolefin (A) is 20% or more. Typically, the Shore A hardness of the crystalline polyolefin (A) is 80 or more. Typically, the weight-average molecular weight of the crystalline polyolefin (A) is 40,000 or more. 【0012】 The degree of crystallinity of crystalline polyolefin (A) may be 20% or more, 25% or more, 30% or more, or 35% or more. The degree of crystallinity of crystalline polyolefin (A) may be 100% or less, 98% or less, 95% or less, 90% or less, or 85% or less. From the viewpoint of achieving better effects of this disclosure, it is preferable that the degree of crystallinity is above the lower limit of the above. The degree of crystallinity can be measured, for example, by differential scanning calorimetry, X-ray diffraction of the polymer, etc. In this disclosure, "crystalline" may mean the property of showing a clear endothermic peak originating from the crystalline portion in differential scanning calorimetry, while "amorphous" may mean the property of not showing a clear endothermic peak originating from the crystalline portion in differential scanning calorimetry. 【0013】 The Shore A hardness of crystalline polyolefin (A) may be 80 or higher, 85 or higher, 90 or higher, or 95 or higher, preferably 85 or higher, more preferably 90 or higher. The Shore A hardness of crystalline polyolefin (A) may be 100 or lower, 99 or lower, 98 or lower, or 97 or lower. Shore A hardness can be used as an indicator of the cohesive force of the resin and can be one of the indicators of adhesion at room temperature and hot. It is preferable that the Shore A hardness be within the above range from the viewpoint of achieving the effects of this disclosure more effectively. 【0014】 The melting point of crystalline polyolefin (A) may be 60°C or higher, 70°C or higher, 80°C or higher, 90°C or higher, 100°C or higher, or 110°C or higher, preferably 80°C or higher. The melting point of crystalline polyolefin (A) may be 150°C or lower, 140°C or lower, 130°C or lower, 120°C or lower, 110°C or lower, 100°C or lower, or 90°C or lower, preferably 120°C or lower, for example 110°C or lower, or 100°C or lower. Being within the above range is preferable from the viewpoint of achieving the effects of this disclosure more favorably. 【0015】 The glass transition temperature of crystalline polyolefin (A) may be -150°C or higher, -125°C or higher, -100°C or higher, -75°C or higher, -50°C or higher, or -25°C or higher. The glass transition temperature of crystalline polyolefin (A) may be 20°C or lower, 10°C or lower, 0°C or lower, -10°C or lower, or -20°C or lower, preferably 0°C or lower, more preferably -10°C or lower. A glass transition temperature below the above upper limit is also preferable from the viewpoint of low-temperature adhesion. 【0016】 Crystalline polyolefin (A) is typically thermoplastic. The melt viscosity (MFR) of crystalline polyolefin (A) may be 3 g / 10 min or more, 5 g / 10 min or more, 7 g / 10 min or more, 10 g / 10 min or more, 12 g / 10 min or more, or 15 g / 10 min or more, preferably 5 g / 10 min or more, more preferably 7 g / 10 min or more. The MFR of crystalline polyolefin (A) may be 40 g / 10 min or less, 30 g / 10 min or less, 20 g / 10 min or less, 15 g / 10 min or less, or 10 g / 10 min or less. It is preferable that the MFR be in the range above the lower limit of the above limits, as this results in a lower melt viscosity and provides better coating stability. The MFR can be measured according to JIS K7210. 【0017】 The weight-average molecular weight of the crystalline polyolefin (A) may be 40,000 or more, 50,000 or more, 75,000 or more, 100,000 or more, 200,000 or more, 300,000 or more, or 500,000 or more, with 100,000 or more being preferred. The weight-average molecular weight of the crystalline polyolefin (A) may be 5,000,000 or less, 2,000,000 or less, 1,500,000 or less, 1,200,000 or less, 1,000,000 or less, 800,000 or less, 600,000 or less, 400,000 or less, or 200,000 or less, with 1,000,000 or less, for example, 600,000 or less being preferred. Having the weight-average molecular weight within the above range is preferable from the viewpoint of achieving the effects of this disclosure more effectively. 【0018】 Crystalline polyolefin (A) is a polymer having repeating units derived from olefins. Preferably, crystalline polyolefin (A) is an α-olefin-based polymer, particularly an α-olefin-based copolymer, having repeating units derived from α-olefins. Crystalline polyolefin (A) may be a homopolymer, copolymer, or a mixture thereof. The copolymer may take any form, such as random copolymerization, block copolymerization, or graft copolymerization. 【0019】 Examples of repeating units contained in crystalline polyolefin (A) include, for example, repeating units derived from ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, and 1-eicosene, which may be contained individually or in combination of two or more. 【0020】 The crystalline polyolefin (A) preferably contains repeating units derived from propylene among the repeating units described above, and may contain, for example, both repeating units derived from propylene and repeating units derived from other α-olefins (e.g., ethylene). Of the repeating units constituting the crystalline polyolefin (A), the repeating units derived from propylene may be 20 mol% or more, 30 mol% or more, 40 mol% or more, 50 mol% or more, 60 mol% or more, or 70 mol% or more, and preferably 30 mol% or more. 【0021】 Specific examples of crystalline polyolefins (A) include copolymers of olefins such as ethylene homopolymers, propylene homopolymers, ethylene-propylene copolymers, propylene-1-butene copolymers, ethylene-1-butene copolymers, ethylene-1-octene copolymers, ethylene-1-hexene copolymers, and ethylene-propylene-1-butene copolymers, with ethylene-propylene copolymers being a preferred example. These may be used individually or in combination of two or more types. 【0022】 Representative commercially available crystalline polyolefin (A) products include the Tuffmer series from Mitsui Chemicals, such as "Tuffmer XM-7090," "Tuffmer XM-7080," "Tuffmer XM-7070," "Tuffmer XM-5090," "Tuffmer XM-5080," "Tuffmer XM-5070," "Tuffmer BL-2491M," and "Tuffmer DF110"; the VERSIFY series from Dow Chemical, such as "VERSIFY3000" and "VERSIFY4200"; the Vistamaxx series from ExxonMobil, such as "Vistamaxx8880," "Vistamaxx3000," and "Vistamaxx3980FL"; and "L-MODU S901," "L-MODU S600," and "L-MODU S400" from Idemitsu Kosan. Furthermore, crystalline polyolefin (A) may be used alone or in combination of two or more types. 【0023】 [(B) Amorphous polyolefins] The hot-melt adhesive compositions of this disclosure include amorphous polyolefin (B). Amorphous polyolefin (B) is a polyolefin that is non-crystalline or has a small amount of crystallinity and can impart flexibility. Amorphous polyolefin (B) is distinguished from other components described herein in terms of crystallinity and / or molecular weight, etc. Typically, amorphous polyolefin (B) has a crystallinity of less than 20%. Typically, amorphous polyolefin (B) has a weight-average molecular weight of 40,000 or more. 【0024】 The degree of crystallinity of amorphous polyolefin (B) may be 0% or more, 3% or more, or 5% or more. The degree of crystallinity of amorphous polyolefin (B) may be less than 20%, 15% or less, 10% or less, 5% or less, 3% or less, or 1% or less. From the viewpoint of achieving better effects of this disclosure, it is preferable that the degree of crystallinity is below the above upper limit. The degree of crystallinity can be measured, for example, by differential scanning calorimetry, X-ray diffraction of the polymer, etc. 【0025】 The softening point of amorphous polyolefin (B) may be 70°C or higher, 80°C or higher, 90°C or higher, 100°C or higher, 110°C or higher, 120°C or higher, or 130°C or higher, preferably 80°C or higher, for example 100°C or higher. The softening point of amorphous polyolefin (B) may be 180°C or lower, 170°C or lower, 160°C or lower, 150°C or lower, 140°C or lower, 130°C or lower, 120°C or lower, or 110°C or lower, preferably 160°C or lower, for example 140°C or lower. Being within the above range is preferable from the viewpoint of achieving better effects of this disclosure. The softening point can be measured by the ring-sphere method. 【0026】 The glass transition temperature of amorphous polyolefin (B) may be -150°C or higher, -125°C or higher, -100°C or higher, -75°C or higher, -50°C or higher, or -25°C or higher. The glass transition temperature of crystalline polyolefin (A) may be 20°C or lower, 10°C or lower, 0°C or lower, -10°C or lower, or -20°C or lower, preferably 0°C or lower, more preferably -10°C or lower. A glass transition temperature below the above upper limit is also preferable from the viewpoint of low-temperature adhesion. 【0027】 Amorphous polyolefins (B) are typically thermoplastic. The MFR of amorphous polyolefins (B) may be 3 g / 10 min or more, 5 g / 10 min or more, 7 g / 10 min or more, 10 g / 10 min or more, 12 g / 10 min or more, or 15 g / 10 min or more, preferably 5 g / 10 min or more, more preferably 7 g / 10 min or more. The MFR of amorphous polyolefins (B) may be 40 g / 10 min or less, 30 g / 10 min or less, 20 g / 10 min or less, 15 g / 10 min or less, or 10 g / 10 min or less. It is preferable for the MFR to be in the range above the lower limit of the above limits, as this results in a lower melt viscosity and provides better coating stability. The MFR can be measured according to JIS K7210. 【0028】 The weight-average molecular weight of amorphous polyolefin (B) may be 40,000 or more, 50,000 or more, 75,000 or more, 100,000 or more, 200,000 or more, 300,000 or more, or 500,000 or more, with 100,000 or more being preferred. The weight-average molecular weight of amorphous polyolefin (B) may be 5,000,000 or less, 2,000,000 or less, 1,500,000 or less, 1,200,000 or less, 1,000,000 or less, 800,000 or less, 600,000 or less, 400,000 or less, or 200,000 or less, with 1,000,000 or less, for example, 600,000 or less being preferred. A weight-average molecular weight within the above range is preferable from the viewpoint of achieving better effects of this disclosure. 【0029】 Amorphous polyolefin (B) is a polymer having repeating units derived from olefins. Preferably, amorphous polyolefin (B) is an α-olefin-based polymer, particularly an α-olefin-based copolymer, having repeating units derived from α-olefins. Amorphous polyolefin (B) may be a homopolymer, copolymer, or a mixture thereof. The copolymer may take any form, such as random copolymerization, block copolymerization, or graft copolymerization. 【0030】 Examples of repeating units contained in amorphous polyolefins (B) include, for example, repeating units derived from ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, and 1-eicosene, which may be contained individually or in combination of two or more. 【0031】 The amorphous polyolefin (B) preferably contains repeating units derived from propylene among the repeating units described above, and may contain both repeating units derived from propylene and repeating units derived from other α-olefins (e.g., ethylene). Of the repeating units constituting the amorphous polyolefin (B), the repeating units derived from propylene may be 20 mol% or more, 30 mol% or more, 40 mol% or more, 50 mol% or more, 60 mol% or more, or 70 mol% or more, and preferably 30 mol% or more. 【0032】 Specific examples of amorphous polyolefins (B) include copolymers of olefins such as ethylene homopolymers, propylene homopolymers, ethylene-propylene copolymers, propylene-1-butene copolymers, ethylene-1-butene copolymers, ethylene-1-octene copolymers, ethylene-1-hexene copolymers, and ethylene-propylene-1-butene copolymers. Preferred examples include binary copolymers of ethylene-propylene and / or ternary copolymers of ethylene-propylene-butene. These may be used individually or in combination of two or more. 【0033】 Representative commercially available amorphous polyolefins (B) include the Bestplast series from Evonik, such as "Bestplast 308," "Bestplast 508," "Bestplast 520," "Bestplast 608," "Bestplast EP V2103," "Bestplast EP V2094," "Bestplast 708," "Bestplast 750," "Bestplast 751," "Bestplast 792," "Bestplast 828," "Bestplast 888," "Bestplast 891," and "Bestplast EP 807"; and the RT series from REXtac, such as "RT2280," "RT2385," "RT2585," and "RT2780." 【0034】 [(C) Polypropylene-based wax] The hot-melt adhesive composition of this disclosure contains a polypropylene-based wax (C). The polypropylene-based wax (C) is a wax having repeating units derived from propylene. The polypropylene-based wax (C) generally has a low molecular weight (less than 40,000), and by lowering the viscosity of the hot-melt adhesive, it can impart applicability and wettability to the adherend. Furthermore, the polypropylene-based wax (C) promotes the crystallization and solidification of crystalline polyolefin (A), improving the solidification rate of the hot-melt adhesive and improving mold release properties. 【0035】 The softening point of the polypropylene wax (C) is 90°C or higher, 100°C or higher, 110°C or higher, 120°C or higher, 130°C or higher, 140°C or higher, or 150°C or higher, preferably 110°C or higher, more preferably 120°C or higher, and even more preferably 130°C or higher. The softening point of the polypropylene wax (C) may be 220°C or lower, 210°C or lower, 190°C or lower, 180°C or lower, 170°C or lower, 160°C or lower, or 150°C or lower, preferably 190°C or lower, for example 160°C or lower. It is preferable that the softening point is within the above range from the viewpoint of achieving the effects of this disclosure more effectively. The softening point can be measured by the ring-ball method. It is also preferable that the softening point of the polypropylene wax (C) is below the above upper limit, as this allows for a lower melting temperature and shortens the working time. 【0036】 The weight-average molecular weight of the polypropylene wax (C) may be 3,000 or more, 5,000 or more, or 7,000 or more, with 3,000 or more being preferred. The weight-average molecular weight of the polypropylene wax (C) may be less than 40,000, 35,000 or less, 30,000 or less, 20,000 or less, or 10,000 or less, with 20,000 or less being preferred. A weight-average molecular weight within the above range is preferable from the viewpoint of achieving better effects in this disclosure. 【0037】 The polypropylene wax (C) may have repeating units other than those derived from propylene, such as repeating units derived from α-olefins. The polypropylene wax (C) may also be a low molecular weight polyolefin, particularly a low molecular weight α-olefin polymer. The polypropylene wax (C) may be a homopolymer, copolymer, or a mixture thereof. The copolymer may take any form, such as random copolymerization, block copolymerization, or graft copolymerization. 【0038】 Examples of repeating units that polypropylene-based wax (C) contains in addition to repeating units derived from propylene include, for example, repeating units derived from ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, and 1-eicosene, and these may be present individually or in combination of two or more. 【0039】 Of the repeating units constituting the polypropylene-based wax (C), the repeating units derived from propylene may be 20 mol% or more, 30 mol% or more, 40 mol% or more, 50 mol% or more, 60 mol% or more, or 70 mol% or more, and preferably 30 mol% or more. 【0040】 Examples of typical commercially available polypropylene waxes (C) include the Viscol series from Sanyo Chemical Industries, Ltd., such as "Viscol 660-P," "Viscol 550-P," "Viscol 440-P," and "Viscol 330-P"; the Highwax series from Mitsui Chemicals, Ltd., such as "Highwax 100P," "Highwax 200P," "Highwax 400P," "Highwax 800P," "Highwax 410P," and "Highwax 420P"; and the Ricosen series from Client Chemicals, Ltd., such as "Ricosen PP6102," "Ricosen PP6502," and "Ricosen PP7502." Polypropylene waxes (C) may be used alone or in combination of two or more types. Furthermore, waxes other than polypropylene waxes (C) may be blended in, as long as they do not impair the desired physical properties. 【0041】 [(D) Tackifier] The hot-melt adhesive compositions of this disclosure may contain a tackifier (D). The tackifier (D) can improve tackiness during melting. 【0042】 The softening point of the tackifier (D) is 90°C or higher, 100°C or higher, 110°C or higher, 120°C or higher, 130°C or higher, 140°C or higher, or 150°C or higher, preferably 110°C or higher, more preferably 120°C or higher, and even more preferably 130°C or higher. The softening point of the tackifier (D) may be 220°C or lower, 210°C or lower, 190°C or lower, 180°C or lower, 170°C or lower, 160°C or lower, or 150°C or lower, preferably 190°C or lower, for example 160°C or lower. It is preferable that the softening point is within the above range from the viewpoint of achieving the effects of this disclosure more effectively. The softening point can be measured by the ring-ball method. It is also preferable that the softening point of the tackifier (D) is below the above upper limit, as this allows for a lower melting temperature and shortens the working time. 【0043】 Examples of tackifiers (D) include rosin resins, rosin esters, disproportionated rosin esters, hydrogenated rosin esters, polymerized rosin, aliphatic hydrocarbon resins, aliphatic aromatic copolymer resins, aromatic petroleum resins, hydrogenated petroleum resins, terpene resins, hydrogenated terpene resins, modified terpene resins, hydrogenated modified terpene resins, terpene phenol resins, hydrogenated terpene phenol resins, styrene resins, coumarone resins, indene resins, etc. Among these, from the viewpoint of compatibility with polyolefins, preferred examples include hydrogenated petroleum resins, terpene resins, or terpene phenol resins. Tackifiers (D) are distinguished from other components such as polyolefins from the viewpoint of the presence or absence of intramolecular double bonds, intramolecular polar groups, intramolecular hydrocarbon groups, etc. 【0044】 Examples of typical commercially available tackifiers (D) include the Alcon series from Arakawa Chemical Co., Ltd., such as "Alcon P-90", "Alcon P-100", "Alcon P-115", "Alcon P-140", "Alcon M-90", "Alcon M-100", "Alcon M-115", and "Alcon M-135"; the "iMarb" series from Idemitsu Kosan Co., Ltd., such as "iMarb S-100", "iMarb S-110", "iMarb P-100", "iMarb P-125", and "iMarb P-140"; and "T-REZ HA125", "T-REZ HB125", and "T-REZ" from ENEOS Corporation. Examples include the T-REZ series such as "OP501," the YS Resin series or YS Polystar series from Yasuhara Chemical Co., Ltd., such as "YS Resin PX1250," "YS Resin PX1150," "YS Resin PX1000," "YS Resin PX1150N," "YS Resin TO125," "YS Resin TO115," "YS Resin TO105," "YS Polystar T160," "YS Polystar T145," "YS Polystar T130," "YS Polystar T115," "YS Polystar T100," and "YS Polystar UH115," and the FTR series from Mitsui Chemicals, such as "FTR6100," "FTR6110," and "FTR6125." The tackifier (D) may be used alone or in combination of two or more types. Furthermore, tackifiers with a softening point of less than 90°C may be blended in, as long as they do not impair the desired physical properties. 【0045】 [(E) Antioxidants] The hot-melt adhesive composition of this disclosure may contain an antioxidant (E). Including an antioxidant (E) improves thermal stability and is preferable from the viewpoint of achieving the effects of this disclosure well. 【0046】 Examples of antioxidants (E) include, for example, hindered phenols, polyphenols, bisphenols, phosphates, thioethers, hydrosaltites, benzimidazoles, and aromatic secondary amines. 【0047】 Examples of typical commercially available antioxidants (E) include the Irganox series from BASF, such as "Irganox 1010," "Irganox 1035," "Irganox 1076," "Irganox 1098," "Irganox 1330," "Irganox 245," "Irganox 259," "Irganox 3114," "Irganox 565," and "Irgafos 168"; and the "ADEKA Stab" series from ADEKA, such as "ADEKA Stab AO-20," "ADEKA Stab AO-30," "ADEKA Stab AO-40," "ADEKA Stab AO-50," "ADEKA Stab AO-60," "ADEKA Stab AO-80," "ADEKA Stab AO-330," "ADEKA Stab PEP-8," "ADEKA Stab PEP-36," "ADEKA Stab HP-10," "ADEKA Stab 2112," and "ADEKA Stab AO-412S." Furthermore, antioxidant (E) may be used alone or in combination of two or more types. 【0048】 [(F) Inorganic fillers] The hot-melt adhesive composition of this disclosure may contain an inorganic filler (F). By adding the inorganic filler (F), it is possible to adjust the adhesiveness, sagging, specific gravity, etc. 【0049】 Examples of inorganic fillers (F) include calcium carbonate (heavy calcium carbonate, untreated surface calcium carbonate, surface-treated calcium carbonate (e.g., fatty acid-treated calcium carbonate), needle-shaped crystalline calcium carbonate), silica (fume silica, hydrophobic silica, precipitated silica, etc.), talc, mica, clay, chrysotile, wollastonite, carbon black, graphite, balloons (shirasu balloons, glass balloons, silica balloons, etc.), inorganic fibers (glass fibers, metal fibers, etc.), titanium dioxide, aluminum oxide, aluminum borate, silicon carbide, silicon nitride, potassium titanate, magnesium borate, titanium diboride, aluminum flakes, aluminum powder, iron powder, etc. Note that inorganic fillers (F) may be used alone or in combination of two or more types. 【0050】 [(G) Elastomer] The hot-melt adhesive compositions of this disclosure may contain an elastomer (G). The elastomer (G) is an elastic polymer. The elastomer (G) may be thermosetting or thermoplastic, preferably thermoplastic. The elastomer (G) is distinguishable from other components described herein in terms of crystallinity, Shore A hardness, and / or molecular weight. Typically, the elastomer (G) is not amorphous. Typically, the elastomer (G) has a Shore A hardness of less than 80. Typically, the elastomer (G) has a weight-average molecular weight of 40,000 or more. 【0051】 The Shore A hardness of elastomer (G) may be 20 or higher, 30 or higher, 40 or higher, 50 or higher, 60 or higher, or 70 or higher, preferably 40 or higher. The Shore A hardness of elastomer (G) may be less than 80, 75 or lower, 70 or lower, 65 or lower, or 60 or lower. From the viewpoint of achieving better effects of this disclosure, it is preferable that the Shore A hardness of elastomer (G) be within the above range. 【0052】 The MFR of elastomer (G) may be 3 g / 10 min or more, 5 g / 10 min or more, 7 g / 10 min or more, 10 g / 10 min or more, 12 g / 10 min or more, or 15 g / 10 min or more, preferably 5 g / 10 min or more, more preferably 7 g / 10 min or more. The MFR of elastomer (G) may be 40 g / 10 min or less, 30 g / 10 min or less, 20 g / 10 min or less, 15 g / 10 min or less, or 10 g / 10 min or less. It is preferable that the MFR be in the range above the lower limit above, as this results in a lower melt viscosity and provides coating stability. The MFR can be measured according to JIS K7210. 【0053】 The weight-average molecular weight of elastomer (G) may be 40,000 or more, 50,000 or more, 75,000 or more, 100,000 or more, 200,000 or more, 300,000 or more, or 500,000 or more, with 100,000 or more being preferred. The weight-average molecular weight of elastomer (G) may be 5,000,000 or less, 2,000,000 or less, 1,500,000 or less, 1,200,000 or less, 1,000,000 or less, 800,000 or less, 600,000 or less, 400,000 or less, or 200,000 or less, with 1,000,000 or less, for example, 600,000 or less being preferred. Having the weight-average molecular weight within the above range is preferable from the viewpoint of achieving the effects of this disclosure more effectively. 【0054】 Examples of elastomer (G) include rubber-based elastomers, olefin-based elastomers, styrene-based elastomers (e.g., hydrogenated or unhydrogenated styrene-based elastomers), vinyl chloride-based elastomers, urethane-based elastomers, ester-based elastomers, amide-based elastomers, and the like. From the viewpoint of compatibility, olefin-based elastomers are preferred. The olefin-based elastomer may be an olefin-based elastomer having repeating units derived from propylene. 【0055】 Representative commercially available elastomer (G) products include the Toughmer PN series from Mitsui Chemicals, such as "Toughmer PN-2070" and "Toughmer PN-3560"; the INFUSE series from Dow Chemical, such as "INFUSE9807," "INFUSE9817," and "INFUSE9990"; and the Vistamaxx series from ExxonMobil, such as "Vistamaxx6502" and "Vistamaxx6202." Elastomer (G) may be used alone or in combination of two or more types. 【0056】 [(H) Plasticizer] The hot-melt adhesive composition of this disclosure may contain a plasticizer (H). The plasticizer (H) is an oily substance such as a low molecular weight compound containing a chain-like alkyl group or an olefin oligomer. The plasticizer (H) can improve the applicability and wettability to the adherend by reducing the viscosity of the hot-melt adhesive. 【0057】 The weight-average molecular weight of the plasticizer (H) may be 100 or more, 300 or more, or 500 or more. The weight-average molecular weight of the plasticizer (H) may be less than 3000, 2500 or less, 20000 or less, 1500 or less, or 1000 or less, with 2000 or less being preferred. A weight-average molecular weight within the above range is preferable from the viewpoint of achieving the effects of this disclosure more effectively. 【0058】 Examples of plasticizers (H) include liquid paraffin, process oil, phthalate-based plasticizers, butene oligomers, butadiene oligomers, liquid ethylene-propylene oligomers, and liquid rubber, but from the viewpoint of compatibility, butene oligomers or liquid ethylene-propylene oligomers are preferred. 【0059】 Examples of typical commercially available plasticizers (H) include the polybutene series from NOF Corporation, such as "NOF Polybutene 0N," "NOF Polybutene 015N," "NOF Polybutene 3N," "NOF Polybutene 10N," "NOF Polybutene 30N," and "NOF Polybutene 200N"; and the Lucant series from Mitsui Chemicals, such as "Lucant LX004," "Lucant LX010," "Lucant LX020," "Lucant LX100," "Lucant LX200," "Lucant LX400," and "Lucant LX900Z." Note that plasticizers (H) may be used alone or in combination of two or more types. 【0060】 [(I) Other ingredients] The hot melt adhesive compositions of this disclosure may, in addition to the above, optionally contain other components (I). Examples of other components (I) include: colorants (e.g., iron oxide, titanium dioxide, other coloring pigments, dyes, etc.); organic solvents (methanol, ethanol, isopropyl alcohol, butanol, acetone, methyl ethyl ketone, ligroin, ethyl acetate, tetrahydrofuran, n-hexane, heptane, or isoparaffinic high-boiling point solvents, etc.); adhesives (silane coupling agents such as vinyltrimethoxysilane, vinyltriethoxysilane, aminosilane, mercaptosilane, epoxysilane, epoxy compounds such as glycidyl ether having a polyoxyalkylene skeleton, etc.); vulcanization accelerators (guanidines, aldehyde-amines, aldehyde-ammonias, thiazoles, sulfur Examples include: phenamides, thioureas, thirams, dithiocarbamates, xantates, etc.; vulcanization aids (long-chain fatty acids with 12 or more carbon atoms such as stearic acid, oleic acid, and palmitic acid, metal oxides such as zinc oxide, magnesium oxide, and lead oxide); anti-aging agents (hindered phenols, mercaptans, sulfides, dithiocarboxylates, thioureas, thiophosphates, thioaldehydes, etc.); UV absorbers and light stabilizers (benzotriazoles, hindered amines, etc.); thixotropes (colloidal silica, organic bentonite, fatty acid amides, hydrogenated castor oil, etc.); and other resin and polymer components (thermosetting resins, thermoplastic resins, etc.). These may be used individually or in combination of two or more types. 【0061】 The hot melt adhesive composition of this disclosure may be solvent-free and may not contain any solvent. 【0062】 The hot-melt adhesive compositions of this disclosure may be non-reactive and may not contain reactive additives. 【0063】 [composition] The amount of crystalline polyolefin (A) in the hot melt adhesive composition may be 2.5% by weight or more, 5% by weight or more, 7.5% by weight or more, 10% by weight or more, 12.5% ​​by weight or more, 15% by weight or more, 17.5% by weight or more, 20% by weight or more, 22.5% by weight or more, or 25% by weight or more, preferably 10% by weight or more, more preferably 15% by weight or more. The amount of crystalline polyolefin (A) in the hot melt adhesive composition may be 40% by weight or less, 35% by weight or less, 30% by weight or less, 25% by weight or less, 20% by weight or less, or 15% by weight or less, preferably 30% by weight or less. 【0064】 The amount of amorphous polyolefin (B) in the hot melt adhesive composition may be 2.5% by weight or more, 5% by weight or more, 7.5% by weight or more, 10% by weight or more, 12.5% ​​by weight or more, 15% by weight or more, 17.5% by weight or more, 20% by weight or more, 22.5% by weight or more, or 25% by weight or more, preferably 10% by weight or more, more preferably 15% by weight or more. The amount of amorphous polyolefin (B) in the hot melt adhesive composition may be 40% by weight or less, 35% by weight or less, 30% by weight or less, 25% by weight or less, 20% by weight or less, or 15% by weight or less, preferably 30% by weight or less. 【0065】 The amount of polypropylene wax (C) in the hot melt adhesive composition may be 10% by weight or more, 15% by weight or more, 20% by weight or more, 25% by weight or more, 30% by weight or more, 35% by weight or more, 40% by weight or more, 45% by weight or more, or 50% by weight or more, preferably 20% by weight or more, more preferably 30% by weight or more. The amount of polypropylene wax (C) in the hot melt adhesive composition may be 75% by weight or less, 70% by weight or less, 65% by weight or less, 60% by weight or less, 55% by weight or less, 50% by weight or less, or 45% by weight or less, preferably 65% ​​by weight or less, more preferably 50% by weight or less. 【0066】 The amount of tackifier (D) in the hot melt adhesive composition may be 2.5% by weight or more, 5% by weight or more, 7.5% by weight or more, 10% by weight or more, 12.5% ​​by weight or more, 15% by weight or more, 17.5% by weight or more, 20% by weight or more, 22.5% by weight or more, or 25% by weight or more, preferably 10% by weight or more, more preferably 15% by weight or more. The amount of tackifier (D) in the hot melt adhesive composition may be 40% by weight or less, 35% by weight or less, 30% by weight or less, 25% by weight or less, 20% by weight or less, or 15% by weight or less, preferably 30% by weight or less. 【0067】 The amount of antioxidant (E) in the hot melt adhesive composition may be 0.01% by weight or more, 0.05% by weight or more, 0.1% by weight or more, 0.3% by weight or more, 0.5% by weight or more, 0.75% by weight or more, or 1% by weight or more, preferably 0.1% by weight or more. The amount of antioxidant (E) in the hot melt adhesive composition may be 5% by weight or less, 4% by weight or less, 3% by weight or less, 2% by weight or less, or 1% by weight or less, preferably 3% by weight or less. 【0068】 The amount of inorganic filler (F) in the hot melt adhesive composition may be 1% by weight or more, 2.5% by weight or more, 5% by weight or more, 7.5% by weight or more, 10% by weight or more, 12.5% ​​by weight or more, or 15% by weight or more, preferably 2.5% by weight or more, more preferably 5% by weight or more. The amount of inorganic filler (F) in the hot melt adhesive composition may be 30% by weight or less, 25% by weight or less, 20% by weight or less, 15% by weight or less, 10% by weight or less, or 5% by weight or less. 【0069】 The amount of elastomer (G) in the hot melt adhesive composition may be 0.5% by weight or more, 1% by weight or more, 2% by weight or more, 3% by weight or more, 4% by weight or more, 5% by weight or more, 6% by weight or more, 7% by weight or more, 8% by weight or more, 9% by weight or more, or 10% by weight or more, preferably 1% by weight or more, more preferably 3% by weight or more. The amount of elastomer (G) in the hot melt adhesive composition may be 25% by weight or less, 20% by weight or less, 15% by weight or less, 10% by weight or less, 7.5% by weight or less, 5% by weight or less, or 2.5% by weight or less, preferably 15% by weight or less, more preferably 10% by weight or less. 【0070】 The amount of other component (I) in the hot melt adhesive composition of this disclosure may be appropriately selected depending on each component. The total amount of other component (I) in the hot melt adhesive composition may be 0.1% by weight or more, 0.2% by weight or more, 0.5% by weight or more, 1% by weight or more, 2.5% by weight or more, or 5% by weight or more. The total amount of other component (I) in the hot melt adhesive composition may be 30% by weight or less, 25% by weight or less, 20% by weight or less, 15% by weight or less, 10% by weight or less, 7.5% by weight or less, or 5% by weight or less, 2.5% by weight or less, or 1% by weight or less, preferably 20% by weight or less, more preferably 10% by weight or less. The amount of each of the other components (I) in the hot melt adhesive composition may be 0.01% by weight or more, 0.05% by weight or more, 0.1% by weight or more, 0.3% by weight or more, 0.5% by weight or more, 0.75% by weight or more, 1% by weight or more, or 2.5% by weight or more. Furthermore, the amounts of each of the other components (I) in the hot melt adhesive composition may be 10% by weight or less, 7.5% by weight or less, 5% by weight or less, 2.5% by weight or less, or 1% by weight or less. The amount of plasticizer (H) may be in accordance with the amount of other components (I). 【0071】 The total amount of crystalline polyolefin (A) and amorphous polyolefin (B) in the hot melt adhesive composition may be 5% by weight or more, 10% by weight or more, 15% by weight or more, 20% by weight or more, 25% by weight or more, 30% by weight or more, 35% by weight or more, 40% by weight or more, 45% by weight or more, or 50% by weight or more, preferably 20% by weight or more, more preferably 30% by weight or more. The total amount of crystalline polyolefin (A) and amorphous polyolefin (B) in the hot melt adhesive composition may be 80% by weight or less, 70% by weight or less, 60% by weight or less, 50% by weight or less, 40% by weight or less, or 30% by weight or less, preferably 60% by weight or less. Being within the above range is preferable from the viewpoint of achieving the effects of this disclosure well. 【0072】 The amount of crystalline polyolefin (A) may be 15 parts by weight or more, 25 parts by weight or more, more than 50 parts by weight, 75 parts by weight or more, 100 parts by weight or more, 125 parts by weight or more, or 150 parts by weight or more, per 100 parts by weight of amorphous polyolefin (B), preferably 25 parts by weight or more, more preferably 60 parts by weight or more, and even more preferably 75 parts by weight or more. The amount of crystalline polyolefin (A) may be 500 parts by weight or less, 450 parts by weight or less, 400 parts by weight or less, 350 parts by weight or less, 300 parts by weight or less, 200 parts by weight or less, 150 parts by weight or less, 100 parts by weight or less, 75 parts by weight or less, or 50 parts by weight or less, per 100 parts by weight of amorphous polyolefin (B), preferably 400 parts by weight or less, more preferably 300 parts by weight or less, and even more preferably 200 parts by weight or less. Being within the above range is preferable from the viewpoint of achieving the effects of this disclosure well. 【0073】 The amount of polypropylene wax (C) may be more than 50 parts by weight, 60 parts by weight or more, 70 parts by weight or more, 80 parts by weight or more, 90 parts by weight or more, 100 parts by weight or more, 110 parts by weight or more, or 120 parts by weight or more, relative to 100 parts by weight of the total amount of crystalline polyolefin (A) and amorphous polyolefin (B), preferably 60 parts by weight or more, more preferably 80 parts by weight or more, and even more preferably 90 parts by weight or more. The amount of polypropylene wax (C) may be 350 parts by weight or less, 300 parts by weight or less, 250 parts by weight or less, 200 parts by weight or less, 150 parts by weight or less, or 100 parts by weight or less, relative to 100 parts by weight of the total amount of crystalline polyolefin (A) and amorphous polyolefin (B), preferably 300 parts by weight or less, more preferably 250 parts by weight or less, and even more preferably 200 parts by weight or less. Being within the above range is preferable from the viewpoint of achieving the effects of this disclosure well. If the value is above the lower limit, the crystallization promoting effect may be improved, and mold release properties may be better. If the value is below the upper limit, adhesion may be improved. 【0074】 The amount of tackifier (D) may be 10 parts by weight or more, 20 parts by weight or more, 30 parts by weight or more, 40 parts by weight or more, 50 parts by weight or more, or 60 parts by weight or more, based on 100 parts by weight of the total amount of crystalline polyolefin (A) and amorphous polyolefin (B), preferably 20 parts by weight or more, and more preferably 40 parts by weight or more. The amount of tackifier (D) may be 150 parts by weight or less, 125 parts by weight or less, 100 parts by weight or less, 75 parts by weight or less, 50 parts by weight or less, or 30 parts by weight or less, based on 100 parts by weight of the total amount of crystalline polyolefin (A) and amorphous polyolefin (B), preferably 100 parts by weight or less, and more preferably 75 parts by weight or less. Being within the above range is preferable from the viewpoint of achieving the effects of this disclosure well. 【0075】 The amount of inorganic filler (F) may be 5 parts by weight or more, 10 parts by weight or more, 15 parts by weight or more, 20 parts by weight or more, 25 parts by weight or more, or 30 parts by weight or more, relative to 100 parts by weight of the total amount of crystalline polyolefin (A) and amorphous polyolefin (B), preferably 10 parts by weight or more, more preferably 20 parts by weight or more. The amount of inorganic filler (F) may be 75 parts by weight or less, 60 parts by weight or less, 50 parts by weight or less, 40 parts by weight or less, 30 parts by weight or less, or 20 parts by weight or less, relative to 100 parts by weight of the total amount of crystalline polyolefin (A) and amorphous polyolefin (B), preferably 60 parts by weight or less, more preferably 40 parts by weight or less. Being within the above range is preferable from the viewpoint of achieving the effects of this disclosure well. 【0076】 The amount of elastomer (G) may be 0.5 parts by weight or more, 1 part by weight or more, 3 parts by weight or more, 5 parts by weight or more, 7 parts by weight or more, 10 parts by weight or more, 12 parts by weight or more, or 15 parts by weight or more, relative to 100 parts by weight of the total amount of crystalline polyolefin (A) and amorphous polyolefin (B), preferably 3 parts by weight or more, more preferably 10 parts by weight or more. The amount of elastomer (G) may be 60 parts by weight or less, 50 parts by weight or less, 40 parts by weight or less, 30 parts by weight or less, 20 parts by weight or less, 15 parts by weight or less, or 10 parts by weight or less, relative to 100 parts by weight of the total amount of crystalline polyolefin (A) and amorphous polyolefin (B), preferably 40 parts by weight or less, more preferably 20 parts by weight or less. Being within the above range is preferable from the viewpoint of achieving the effects of this disclosure well. 【0077】 [Physical properties] The hot melt adhesive composition of the present disclosure may have a melt viscosity at 180°C, which is a general coating temperature of hot melt adhesives, of 5,000 mPa·s or more, 7,500 mPa·s or more, 10,000 mPa·s or more, 12,000 mPa·s or more, 15,000 mPa·s or more, 20,000 mPa·s or more, or 25,000 mPa·s or more, preferably 10,000 mPa·s or more, more preferably 15,000 mPa or more. The hot melt adhesive composition of the present disclosure may have a melt viscosity at 180°C, which is a general coating temperature of hot melt adhesives, of 200,000 mPa·s or less, 150,000 mPa·s or less, 100,000 mPa·s or less, 50,000 mPa·s or less, 30,000 mPa·s or less, or 20,000 mPa·s or less, preferably 150,000 mPa·s or less, more preferably 100,000 mPa·s or less. If the melt viscosity is within the above range, it is preferable because there will be no occurrence of phenomena such as dripping or coating unevenness when applying to the adherend. The above melt viscosity is a value measured using a parallel plate type rheometer under the condition of a shear rate of 4.3 sec -1 -1. 【0078】 In the viscoelastic behavior when the hot melt adhesive composition of the present disclosure is quenched from 160°C at 33°C per minute, the storage elastic modulus at 60°C is 1×10 4 Pa or more, 5×10 4 Pa or more, 1×10 5 Pa or more, 5×10 5 Pa or more, 1×10 6 Pa or more, 2×10 6 Pa or more, or 3×10 6 Pa or more, preferably 1×10 5 Pa or more, more preferably 1×10 6 Pa or more. In the viscoelastic behavior when the hot melt adhesive composition of the present disclosure is quenched from 160°C at 33°C per minute, the storage elastic modulus at 60°C is 1×10 8 Pa or less, 5×10 7 Pa or less, 1×10 7 Pa or less, 5×10 6 Pa or less, 3×10 6 Pa or less, or 1×106 The storage modulus may be less than or equal to Pa. The above storage modulus was calculated using a parallel plate type rheometer at a shear rate of 4.3 sec. -1 These are values ​​measured under the following conditions. 【0079】 In the viscoelastic behavior of the hot melt adhesive composition of this disclosure when rapidly cooled from 160°C at 33°C per minute, the temperature at which tanδ becomes 1 or less may be 30°C or higher, 40°C or higher, 50°C or higher, 60°C or higher, or 70°C or higher, preferably 40°C or higher, more preferably 60°C or higher. In the viscoelastic behavior of the hot melt adhesive composition of this disclosure when rapidly cooled from 60°C at 33°C per minute, the temperature at which tanδ becomes 1 or less may be 100°C or lower, 90°C or lower, 80°C or lower, or 70°C or lower, preferably 80°C or lower. Note that tanδ is the loss tangent, and is the ratio of the storage shear modulus (G') to the loss shear modulus (G"), G'' / G'. tanδ was measured using a parallel plate type rheometer at a shear rate of 4.3 sec. -1 These are values ​​measured under the following conditions. 【0080】 <Method for manufacturing hot melt adhesive composition> The hot melt adhesive composition of this disclosure can be manufactured by mixing (A) to (C). For example, the hot melt adhesive composition can be manufactured by mixing (A) to (C) together with other components as needed using a heated mixing stirrer. 【0081】 <Adhesive and method for manufacturing the same> The adhesive body of this disclosure comprises a first substrate and a second substrate bonded to the first substrate via a hot-melt adhesive layer formed from a hot-melt adhesive composition. 【0082】 The process includes: a coating step of applying the disclosed hot melt adhesive composition to one surface of a first substrate to form a hot melt adhesive layer; and a bonding step of bonding the first substrate and a second substrate via the hot melt adhesive layer. The process may further include a curing step for crystallizing the hot melt adhesive layer. 【0083】 [Base material] There are no particular restrictions on the base materials used as the first and second base materials. Examples include wood materials; plastic materials such as polyolefins, polyvinyl chlorides, polyurethanes, polyesters, and epoxy resins; foams of the aforementioned plastic materials; rubber materials such as natural rubber and synthetic rubber; metal materials such as aluminum, iron, and stainless steel; and inorganic materials such as ceramics. There are no particular restrictions on the shape of each base material. For example, they may be in the form of a sheet, foil, plate, or molded body. Furthermore, each base material may consist of only one material, or it may consist of two or more materials. The material of the surface on which the adhesive layer of the base material is provided is preferably nonmetallic, more preferably a resin as described above, and even more preferably polyolefin, particularly polypropylene. 【0084】 [Coating process] In the coating process, various hot melt applicators can be used to coat the substrate, such as spray guns, comma coaters, die coaters, and roll coaters. When coating the substrate, it is usually heated to a temperature of 140°C to 200°C to melt the adhesive, and then applied in a molten state. After coating a release film or release paper, it may be used by heat-transferring it to another substrate. After coating, the hot melt adhesive layer on the substrate may be solidified by cooling. The pre-coated substrate (adhesive-containing substrate) obtained after the coating process may be used directly in the next molding process, or it may be stored before being used in the next process. 【0085】 [Adhesion process] In the bonding process, the hot-melt adhesive layer may be heated and re-melted as needed. Methods for heat activation include, but are not limited to, heating, ultrasound, high frequency, and microwaves. Reactivation is preferably performed immediately before pressing the pre-coated substrate and the second substrate together. Pressing the pre-coated substrate and the second substrate together is performed before the hot-melt adhesive composition layer solidifies. There are no particular restrictions on the pressing method; examples include press bonding and vacuum forming. The second substrate may or may not be heated. Furthermore, if the hot-melt adhesive composition layer is reactivated, heating is not required during pressing, but heating may be applied simultaneously with pressurization as needed. 【0086】 The heating activation temperature is 100 to 200°C, preferably 100 to 180°C, and more preferably 120 to 160°C, based on the surface temperature of the hot melt adhesive layer. The pressure applied during bonding between the first and second substrates may be 0.01 to 0.5 MPa, preferably 0.01 to 0.20 MPa, and more preferably 0.01 to 0.10 MPa. The bonding time may be, for example, 1 to 300 seconds, preferably 1 to 60 seconds, and more preferably 10 to 30 seconds. 【0087】 [Contact and separation process with the mold] The method for manufacturing an adhesive according to the present disclosure preferably includes a step in which a mold and a hot-melt adhesive composition come into contact. The hot-melt adhesive composition according to the present disclosure may be in contact with the mold during the coating step or the bonding step. For example, the method for manufacturing an adhesive according to the present disclosure can be suitably used in a vacuum forming process that includes a step in which a mold and a hot-melt adhesive composition come into contact. 【0088】 The material of the mold is not limited, but examples include metal and ceramic, with metal being preferred (for example, aluminum, iron, stainless steel, and various other alloys). 【0089】 The method for manufacturing the adhesive according to the present disclosure may further include a step of peeling the hot melt adhesive layer formed from the hot melt adhesive composition from the mold. The hot melt adhesive layer may be peeled from the mold after cooling. 【0090】 <Automotive interior materials and methods for manufacturing the same> [Automotive Interior Materials] The automotive interior materials of this disclosure include an automotive interior molded article and an automotive interior surface material (hereinafter also referred to as "surface material") bonded to the automotive interior molded article via a hot-melt adhesive layer formed from the hot-melt adhesive composition of this disclosure. The surface material may be a surface material derived from a hot-melt adhesive layer-containing surface material (pre-coated surface material). Examples of automotive interior materials include door trims, instrument panels, ceiling materials, rear trays, pillars, and the like. 【0091】 The material of the molded product for automotive interiors is not particularly limited as long as it is used for automotive interior materials. Examples include paper, wood and other woody materials; plastic materials such as polyolefins (polypropylene, polyethylene, ethylene-propylene copolymer, etc.), polyvinyl chloride, polyurethane, polyester, epoxy resin, nylon, polyester, polycarbonate, polyurethane, acrylic, ABS, PCABS, etc.; rubber materials such as natural rubber and synthetic rubber; metal materials such as aluminum, iron, and stainless steel; and inorganic materials such as ceramics. The molded product for automotive interiors may consist of only one material or may consist of two or more materials. The material of the surface on which the adhesive layer of the molded product for automotive interiors is provided is preferably a non-metallic material as described above, more preferably a resin material as described above, and even more preferably a polyolefin including polypropylene. 【0092】 The surface material is not particularly limited as long as it is made of a material used in automotive interior materials, and examples include plastic sheets such as polyolefin, flexible polyvinyl chloride, and polyurethane; foams of the aforementioned plastics; rubber sheets such as natural rubber and synthetic rubber; fabric materials such as woven fabrics and nonwoven fabrics; and metal foils such as aluminum. The surface material may consist of only one layer, or it may contain two or more layers of the same or different materials. Examples of surface materials containing two or more layers include sheet materials in which one or more layers of the aforementioned plastic foams are laminated to one or more layers of the aforementioned plastic sheets, rubber sheets, fabric materials, and metal foils. Examples of such laminated sheet materials include flexible polyvinyl chloride with polyolefin foam, olefin-based thermoplastic elastomer with polyolefin foam, and fabric with polyurethane foam. The material of the surface on which the adhesive layer of the surface material is provided is preferably the aforementioned surface material which is nonmetallic, more preferably the aforementioned surface material which is made of resin, and even more preferably polyolefin such as polypropylene. 【0093】 [Manufacturing method for automotive interior materials] The method for manufacturing automotive interior materials according to this disclosure is a method for manufacturing an adhesive body, wherein the adhesive body is an automotive interior material, the first base material is a surface material, and the second base material is a molded product for automotive interiors. Conversely, the adhesive body is an automotive interior material, the first base material is a molded product for automotive interiors, and the second base material is a surface material. 【0094】 An example of a method for manufacturing automotive interior materials is a step of applying the hot melt adhesive composition of this disclosure to the back surface of a surface material (for example, the foamed layer surface of the surface material) to obtain a surface material containing a hot melt adhesive layer (pre-coated surface material); a step of reactivating the obtained pre-coated surface material with a far-infrared heater or the like to melt the hot melt adhesive layer, and then pressing the surface material and the molded product for automotive interiors together via the hot melt adhesive layer. Furthermore, a curing step for crystallizing the hot melt adhesive layer may be included. Note that if heat bonding is possible in the step of pressing with the substrate, reactivation with a far-infrared heater or the like may not be necessary. Note that the back surface of the surface material means the surface that faces the molded product for automotive interiors when bonding the surface material to the molded product for automotive interiors. [Examples] 【0095】 The present disclosure will be described in more detail below with reference to examples and comparative examples, but this disclosure is not limited thereto. 【0096】 <Examples 1-13 and Comparative Examples 1-5> A hot melt adhesive composition was obtained by mixing the components listed below at 180°C using a mixing and stirring machine (Moriyama Seisakusho Co., Ltd. dual-arm kneader SV-1-1) with the composition shown in Table 1 below. 【0097】 [Table 1] 【0098】 [Component A] • A-1: ​​Dow Chemical's Versify 4200 (melting point 84°C, Shore A hardness 94, propylene-ethylene copolymer) • A-2: Dow Chemical's Versify 3000 (melting point 108°C, Shore A hardness 96, propylene-ethylene copolymer) [Component B] • B-1: Evonik VESTOPLAST 792 (softening point 108°C, propylene-ethylene-butene copolymer) • B-2: REXTAC RT2585 (softening point 132°C, propylene-ethylene copolymer) [Component C] • C-1: Viscol 660-P manufactured by Sanyo Chemical Industries, Ltd. (softening point 145°C, weight-average molecular weight 8000, polypropylene wax) • C-2: Sanyo Chemical Industries, Ltd.'s Sunwax 171-P (softening point 107°C, weight-average molecular weight 9500, polyethylene wax) [Component D] • D-1: Alcon P140 manufactured by Arakawa Chemical Co., Ltd. (softening point 140°C, hydrogenated petroleum type) • D-2: Alcon P90 manufactured by Arakawa Chemical Co., Ltd. (softening point 90°C, hydrogenated petroleum-based) • D-3: YS Resin PN1150 manufactured by Yasuhara Chemical Co., Ltd. (softening point 115°C, terpene-based) • D-4: YS Polystar T145 manufactured by Yasuhara Chemical Co., Ltd. (softening point 145°C, terpene phenol type) [Component E] • E-1: BASF Irganox 1010 (melting point 110°C, hindered phenol type) • E-2: BASF Irgaphos 168 (melting point 183°C, phosphorus-based) [Component F] F-1: Calcium carbonate 300 mesh product manufactured by Shiraishi Calcium Co., Ltd. [Ingredient G] • G-1: Toughmer PN-2070 manufactured by Mitsui Chemicals (melting point 140°C, Shore A hardness 75, propylene-based elastomer) G-2: ExxonMobil VISTAMAXX6202 (Vicat softening point 48°C, Shore A hardness 61, propylene-based elastomer) 【0099】 The hot-melt adhesive compositions obtained in Examples 1-13 and Comparative Examples 1-4 were used to measure melt viscosity and cooling viscoelasticity as follows. In addition, samples for adhesion tests were prepared as follows, and mold release properties, initial creep, adhesive strength, and heat creep resistance were evaluated. 【0100】 [Melting viscosity] Using a parallel plate rheometer, at a temperature of 180°C and a shear rate of 4.3 sec, -1 The measurements were taken under the specified conditions. The results are shown in Table 1. 【0101】 [The temperature at which the storage modulus and tanδ become 1 or less during rapid cooling] The viscoelastic behavior of a sample rapidly cooled from 160°C to 33°C per minute using a parallel plate rheometer was measured at a shear rate of 4.3 sec. -1 Measurements were taken under the specified conditions. The storage modulus at 60°C was recorded. The temperature at which tanδ became 1 or less was also recorded. The results are shown in Table 1. The temperature at which tanδ becomes 1 or less can be used as an indicator of mold release properties. At the beginning of the measurement, since the hot melt adhesive is in a molten state, viscosity predominates over elasticity, so tanδ is greater than 1. However, as the hot melt adhesive solidifies with rapid cooling, elasticity becomes dominant over viscosity. The temperature at which tanδ becomes 1 or less can be considered the temperature at which the hot melt adhesive solidifies. 【0102】 [Preparation of sample 1 for adhesion test] The above adhesive was applied to the surface of the surface material (TPO / PPF, total thickness 4 mm) at 180°C using a roll coater to create an adhesive layer of 100 g / m². Next, within one day of adhesive application, the surface material was heated to over 160°C using a far-infrared heater, immediately after which it was placed on top of an aluminum plate (thickness 1 mm) and compressed under conditions of 0.1 MPa for 15 seconds to obtain a laminate (adhesion test sample 1). 【0103】 [Mold release properties] Within one minute of obtaining the laminate (adhesion test sample 1), the peel strength (N / 25mm) at a 90-degree peel was measured using a push-pull gauge. 〇:10N / 25mm or more ×: Less than 10N / 25mm 【0104】 [Preparation of sample 2 for adhesion test] The above adhesive was applied to the surface of the surface material (TPO / PPF, total thickness 4 mm) at 180°C using a roll coater to create an adhesive layer of 100 g / m². Next, within one day of adhesive application, the surface material was heated to over 160°C using a far-infrared heater, immediately after which it was placed on top of a PP board (thickness 2 mm) and compressed under conditions of 0.1 MPa for 15 seconds to obtain a laminate (adhesion test sample 2). 【0105】 [Initial Creep] After obtaining the laminate (adhesion test sample 2), a load of 200 g / 25 mm was applied in a 60°C atmosphere at a 90-degree angle, and the peel length (mm) after 5 minutes was measured. The results are shown in Table 1. BA: Interfacial fracture on the substrate side FB: Material failure of the surface material CF: Cohesive failure of adhesives The number after the state of destruction indicates the percentage of destruction. 【0106】 [Adhesive strength] The laminate (adhesion test sample 2) was cured at 25°C for 24 hours, and the peel strength (N / 25mm) at 180° peel was measured. The PP board was fixed with a jig, and the surface material was peeled off by pulling. The peeling speed was measured at 200 mm per minute. The results are shown in Table 1. 【0107】 [Heat-resistant creep] After curing the laminate (adhesion test sample 2) at 25°C for 24 hours, a load of 100g or 200g / 25mm was applied in a 90-degree angle direction in an 80°C atmosphere, and the peel length (mm) after 24 hours was measured. The results are shown in Table 1. 【0108】 [result] In the samples of Examples 1 to 13, good mold release properties and adhesive properties were obtained. In Comparative Example 1, mold release properties and heat creep resistance were reduced because crystalline polyolefin (A) was not included. In Comparative Examples 2 and 3, mold release properties were reduced because the amount of polypropylene-based wax included was outside the scope of this disclosure. In Comparative Example 4, mold release properties and heat creep resistance were reduced because polyethylene-based wax was used. [Industrial applicability] 【0109】 The hot-melt adhesive composition of this disclosure can be used, for example, as a solvent-free adhesive with no VOC emissions, and has excellent adhesion and heat resistance to resin substrates, especially olefin substrates. Furthermore, it can be easily peeled off the mold (for example, when bonded using a vacuum forming method), making it suitable for use as an adhesive for automotive interiors.

Claims

[Claim 1] Crystalline polyolefin (A) having a Shore A hardness of 80 or higher, Amorphous polyolefin (B), Polypropylene-based wax (C) and Tackifier (D) Includes, The amount of the polypropylene-based wax (C) is 60 parts by weight or more and 300 parts by weight or less, relative to 100 parts by weight of the total amount of the crystalline polyolefin (A) and the amorphous polyolefin (B). The weight-average molecular weight of the crystalline polyolefin (A) is 40,000 or more. The weight-average molecular weight of the amorphous polyolefin (B) is 40,000 or more. A hot-melt adhesive composition wherein the weight-average molecular weight of the polypropylene-based wax (C) is 35,000 or less. [Claim 2] The hot melt adhesive composition according to claim 1, wherein the melting point of the crystalline polyolefin (A) is 80°C or higher. [Claim 3] The hot melt adhesive composition according to claim 1, wherein the crystalline polyolefin (A) comprises an ethylene-propylene copolymer. [Claim 4] The hot melt adhesive composition according to claim 1, wherein the amorphous polyolefin (B) has a softening point of 100°C or higher. [Claim 5] The hot melt adhesive composition according to claim 1, wherein the amorphous polyolefin (B) comprises at least one selected from the group consisting of ethylene-propylene binary copolymers and ethylene-propylene-butene terpolymers. [Claim 6] The hot melt adhesive composition according to claim 1, wherein the softening point of the polypropylene-based wax (C) is 130°C or higher. [Claim 7] The hot melt adhesive composition according to claim 1, wherein the softening point of the tackifier (D) is 90°C or higher. [Claim 8] The hot melt adhesive composition according to claim 1, wherein the tackifier (D) comprises at least one selected from the group consisting of hydrogenated petroleum resin, terpene resin, and terpene phenol resin. [Claim 9] The hot melt adhesive composition according to claim 1, comprising an antioxidant (E). [Claim 10] The hot melt adhesive composition according to claim 1, comprising an inorganic filler (F). [Claim 11] The hot melt adhesive composition according to claim 1, comprising elastomer (G). [Claim 12] The hot melt adhesive composition according to claim 1, wherein the melt viscosity at 180°C is 15,000 mPa·s or more and 100,000 mPa·s or less. [Claim 13] A hot melt adhesive composition according to claim 1, for use in automotive interior materials. [Claim 14] A surface material for automotive interiors, and a pre-coated surface material for automotive interiors comprising a hot-melt adhesive layer formed from the hot-melt adhesive composition described in any one of claims 1 to 13 on the back surface of the automotive interior surface material. [Claim 15] An automotive interior material comprising a molded product for automotive interiors, and the automotive interior precoat surface material according to claim 14, which is bonded to the automotive molded product via the hot melt adhesive layer. [Claim 16] A method for manufacturing an adhesive, The adhesive body comprises a first substrate and a second substrate bonded to the first substrate via a hot melt adhesive layer formed from the hot melt adhesive composition described in any one of claims 1 to 13. A method for manufacturing an adhesive, comprising the step of bringing a mold into contact with the hot melt adhesive composition.

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