JP4095972B2 - Manufacturing method of precoat skin material for automobile interior material and automobile interior material - Google Patents

Description

  The present invention relates to a precoat skin material for automobile interior materials and a method for producing an automobile interior material. More specifically, in an automobile interior material manufactured by subjecting a skin material and a molded product to a heat bonding process using an adhesive, a precoat skin material obtained by applying an adhesive in advance and the precoat skin material are used. The present invention relates to a method for manufacturing an automobile interior material.

  Currently, many interior materials are used in automobiles in addition to instrument panels, doors, ceiling materials, rear trays, pillars, and the like. These interior materials are generally composed of a skin material and a molded product, and are usually bonded to each other while hot-molding the skin material according to the shape of the molded product using a solution-type adhesive. (Patent Document 1 and Patent Document 2).

  The skin material used here is a surface material such as a plastic sheet such as polyvinyl chloride or thermoplastic polyolefin, or a fiber material such as tricot, woven fabric, or nonwoven fabric, or polypropylene, polyethylene, polybutylene, and a copolymer of these olefins. Is a sheet-like material obtained by laminating a polyolefin-based foam produced by using, as a main component, by adhesion or heat fusion. The thickness of the skin material is generally about 0.3 to 1.5 mm, and the thickness of the polyolefin-based foam is generally about 1.5 to 3 mm. The molded products used here are injection molded products of various plastics such as acrylonitrile-butadiene-styrene resin (ABS resin), polypropylene, sheets, wood chips, essential powders, etc. with thermosetting resins and polyolefin resins. It means an essentially molded product or wood board hardened by hot press molding.

  Conventionally, solvent-based adhesives have been the mainstream for adhesives used in automobile interior materials, and are directly applied to molded products, and immediately transferred to a heat vacuum forming process after drying. As the adhesive, for example, chloroprene rubber, nitrile rubber, urethane, acrylic, polyester, and the like are used. Such an adhesive is applied to a molded product by spraying, but there are problems such as a large loss due to scattering, uneven coating easily, and deterioration of the working environment due to volatilization of an organic solvent. However, since the interior material has a complicated shape, there is no good application means other than spraying, and the application work must be performed for each molded product. On the other hand, a method of applying an adhesive to a polyolefin foam in advance and thermally bonding it to a molded product in a subsequent process has also been proposed, but in order to ensure sufficient adhesion to the molded product surface, Therefore, since the coated product is wound or cut and stored, it is blocked from the surface layer, so that there is a drawback that a release paper or a release film must be inserted. In addition, these release papers and release films not only require an extra step of peeling one by one in the bonding step, but also have the disadvantage of becoming industrial waste that is difficult to reuse.

  Hot melt adhesives are used in various industries because they have the convenience of being applied in a melted state and completed when they are cooled, and are environmentally compatible because they are solvent-free. As the base polymer, ethylene copolymers such as ethylene-vinyl acetate copolymer, polyethylene, amorphous polypropylene, crystalline polypropylene, crystalline polybutylene, styrene block copolymer, polyamide, polyester, etc. are mainly used. To this, various tackifier resins, oils, waxes and other various additives are added to obtain a hot melt adhesive. However, when ethylene copolymer, polyethylene, amorphous polypropylene, styrene block copolymer, etc. are used as the base polymer, low polar adherends such as polypropylene or high polarities such as wood and cloth Although it is possible to exhibit the adhesive performance of a thing, it has the fault that heat resistance is scarce (patent document 3).

  In order to ensure heat resistance, for example, (A) a method of making the base polymer have a high softening point and a high melting point, and (B) a method of lowering the melt index such as increasing the molecular weight to lower the high-temperature fluidity can be considered.

  In the case of (A), the active temperature of the adhesive is increased, and it is necessary to increase the skin temperature at the time of vacuum molding, and the adhesiveness cannot be ensured unless the molded product is preheated. In the case of (B), since the melt viscosity of the adhesive increases, it becomes difficult to apply the adhesive to the skin material. In addition, when a high melting crystalline wax is used, both heat resistance and coatability can be achieved, but the adhesive layer is brittle and easily broken, so the adhesive strength of the bonded product is not sufficient, and the impact resistance is remarkably poor. Not practical.

  On the other hand, when polyamide, polyester, or the like is used, the heat resistance of the hot melt itself can be obtained, but the adhesion between low-polar adherends such as polypropylene is insufficient.

  In addition, an example in which crystalline polybutylene is used as a base polymer of a hot melt adhesive is also known, but it has a drawback in flexibility at low temperatures. Moreover, it was difficult to satisfy the heat resistance characteristics of about 100 ° C. required for this application.

  On the other hand, as a method for improving the disadvantages of the solvent-based adhesive method, for example, as shown in Patent Document 4, a composite molding process of a composite in which a hot melt adhesive is previously provided on a laminate composed of a skin material and a foam Although a method has been disclosed, this method tends to cause problems such as the convex shape that fixes the surface of the molded product in advance does not match the shape of the molded product.

  Further, as a hot melt adhesive, (A) an amorphous olefin polymer is 50 to 90% by weight, and (B) a crystalline polypropylene wax having a softening point of 120 ° C. or higher and / or an ethylene content of 65% by weight. % Is known as a hot-melt adhesive comprising 5 to 44% by weight of a crystalline ethylene polymer obtained by polymerizing at least% monomer, and (D) 1 to 20% by weight of a tackifying resin. (Patent Document 3).

However, such hot melt adhesives have the disadvantage that the 180 degree peel strength is low, the 100 ° C. creep is large, or both are poor.
JP 2001-226535 A JP 2000-198940 A JP-A-12-226561 Japanese Patent Laid-Open No. 62-264939

  Accordingly, an object of the present invention is to provide a precoat skin material for an automotive interior material and a method for producing an automotive interior material using an adhesive that is non-blocking and does not have blocking properties and has excellent durability and adhesive properties. is there.

  Another object of the present invention is to provide a precoat skin material for automobile interior material and a method for producing the automobile interior material, which can greatly shorten the bonding process for producing the automobile interior material. .

  Still another object of the present invention is to provide a precoat skin material for an automotive interior material that has good adhesion to an olefin material, exhibits excellent heat resistance, and is solvent-free, and a method for producing the automotive interior material. It is in.

The above-mentioned objects are achieved by the following (1) to ( 11 ).

  (1) Amorphous-poly (α-olefin) (A) having a melt viscosity in the range of 500 to 100,000 mPa · s / 190 ° C., a tackifier resin (B) having a softening point of 110 ° C. or higher by the ring and ball method, and A polypropylene-based wax (C) having a melting point of 120 ° C. or higher is an essential component, and a hot melt adhesive having a weight ratio of (A) and (C) of 100/50 to 100/100 is applied to the back surface of the automobile interior skin material. A precoat skin material for automobile interior, which is applied in advance.

  (2) The precoat skin material according to (1), wherein the automobile interior skin material is made of a surface material alone, and the hot melt adhesive is directly applied directly to the back surface of the surface material.

  (3) The automobile interior skin material comprises a surface layer material and a polyolefin foam layer adhered or heat-sealed to the back surface thereof, and the hot melt adhesive is applied to the surface of the polyolefin foam layer ( The precoat skin material as described in 1) or (2).

  (4) In any one of (1) to (3), the weight ratio of the amorphous-poly (α-olefin) (A) / tackifier resin (B) is 100/10 to 100/100. The precoat skin material described.

  (5) The precoat skin material according to any one of (1) to (4), wherein the thickness of the hot melt adhesive applied to the skin material is 10 to 500 μm.

  (6) The precoat skin material according to (4), wherein the hot melt adhesive further contains a polyolefin in an amount of 30% by weight or less based on the adhesive.

  (7) The precoat skin material according to (3), wherein the skin material is a thermoplastic plastic sheet or fiber material alone or a laminate of a polyolefin foam.

  (8) Amorphous-poly (α-olefin) (A) having a melt viscosity in the range of 500 to 50,000 mPa · s / 190 ° C., a tackifier resin having a softening point of 110 to 180 ° C. or higher (B) ) And a polypropylene wax (C) having a melting point of 120 to 170 ° C. or higher, the weight ratio of (A) to (C) is 100/50 to 100/100, and the amorphous-poly (α- An automobile characterized in that a hot melt adhesive having a weight ratio of (olefin) (A) / tackifier resin (B) of 100/10 to 100/100 is previously applied to the back surface of an automobile interior skin material. Precoat skin material for interior.

( 9 ) The precoat skin material according to (8), wherein the automobile interior skin material is made of a surface layer alone, and the hot melt adhesive is directly applied directly to the back surface of the surface layer material.

( 10 ) The automobile interior skin material comprises a surface layer material and a polyolefin foam layer bonded to the back surface thereof, and the hot melt adhesive is applied to the surface of the polyolefin foam layer. Precoat skin material.

( 11 ) A method for producing an automobile interior material, comprising: contacting the precoated skin material according to any one of (1) to ( 10 ) above with a molded product, and vacuum-forming and bonding the molded product without heating. .

  As a result of diligent research, the inventors of the present invention have used 100% as an adhesive by blending a specific amorphous-poly (α-olefin) (hereinafter referred to as APAO), a tackifier resin, and a high melting point wax in a specific ratio. It has been found that it can be bonded to various substrates at an active temperature of 100 to 150 ° C. while maintaining the heat resistance at 0 ° C.

  Furthermore, by pre-coating hot melt adhesive containing APAO, tackifier resin and polypropylene wax in specific proportions on polyolefin foam, there is no blocking and good adhesiveness can be obtained without heating the molded product. It was found that a precoat skin material can be provided.

  As described above, the precoat interior material for automobile interior according to the present invention, which can greatly shorten the bonding process for producing the automobile interior material, has good adhesion to the olefin material, Since it exhibits excellent heat resistance and is solvent-free, it is very useful industrially.

  As the component A of the hot melt adhesive used in the present invention, an amorphous-poly (having a melt viscosity of 500 to 100,000 mPa · s / 190 ° C., preferably 1,000 to 50,000 mPa · s / 190 ° C. is first used. α-olefin) (hereinafter abbreviated as APAO). That is, when the melt viscosity is less than 500 mPa · s / 190 ° C., sufficient cohesive force cannot be obtained. On the other hand, when the melt viscosity exceeds 100,000 mPa · s / 190 ° C., a hot melt adhesive using a roll coater or a curtain spray is used. The workability is reduced when applying. Specifically, for example, Ubetak UT2115 (propylene homopolymer, melt viscosity 1,500 mPa · s / 190 ° C), UT2180 (propylene homopolymer, melt viscosity 8,000-8,500 mPa · s / 190 ° C), UT2215 ( Propylene-ethylene copolymer, melt viscosity 1,500 mPa · s / 190 ° C., UT2280 (propylene-ethylene copolymer, melt viscosity 8,000-8,500 mPa · s / 190 ° C.), UT2330 (propylene-ethylene copolymer, melt viscosity 3 , 3,000-3,500 mPa · s / 190 ° C), UT2380 (propylene-ethylene copolymer, melt viscosity 8,000-8,500 mPa · s / 190 ° C), UT2535 (propylene-ethylene copolymer, melt viscosity 3,000-3). , 500 UT2535 (propylene-ethylene copolymer, melt viscosity 8,000-8,500 mPa · s / 190 ° C), UT2730 (propylene-butene-1 copolymer, melt viscosity 3,000-3,500 mPa ·). s / 190 ° C), UT2715 (propylene-butene-1 copolymer, melt viscosity 1,500 mPa · s / 190 ° C), UT2780 (propylene-butene-1 copolymer, melt viscosity 8,000-8,500 mPa · s / 190 ° C) ), E34200 (propylene-ethylene copolymer, melt viscosity 18,600 mPa · s / 190 ° C) (manufactured by Ube Industries, Ltd.), E27200 (propylene-butene-1 copolymer, melt viscosity 19,200 mPa · s / 190 ° C), ( As mentioned above, all are Ube Industries, Ltd.), Ves oplast 750 (propylene-ethylene-butene-1) terpolymer, melt viscosity 50,000 mPa · s / 190 ° C., Vestplast 520 (propylene-ethylene-butene-1) terpolymer, melt viscosity 22,000 mPa · s / 190 ° C.) All are manufactured by Degussa AG), etc., Eastoflex Amorphous Polyolefin M1030 (propylene / propylene-ethylene copolymer mixture, melt viscosity 3,000 mPa · s / 190 ° C.), E-1060 (propylene-ethylene copolymer, melt viscosity 6,000 mPa · s / 190 ° C.) (all of which are manufactured by Eastman Chemical).

  There are various types of such APAO (A). For example, homopolymers or copolymers such as atactic polypropylene and atactic polybutene-1, or copolymers such as propylene, ethylene and butene-1 Alternatively, there are terpolymers, propylene homopolymers, propylene-butene copolymers, propylene-ethylene copolymers, and the like.

As the B component of the hot melt adhesive used in the present invention, a tackifier resin (B
). The tackifier resin (B) has a softening point measured by a ring and ball method of 110 ° C. or higher, preferably 110 to 180 ° C., more preferably 120 to 160 ° C. There are various types of such tackifier resins (B). For example, for example, aliphatic petroleum resins, aromatic petroleum resins, fully hydrogenated aliphatic petroleum resins, fully hydrogenated Aromatic petroleum resin,
Measure one or more of partially hydrogenated aliphatic petroleum resin, partially hydrogenated aromatic petroleum resin, α-pinene resin, terpene resin, terpene modified phenol resin, styrene resin, rosin resin, and modified resins thereof. And adhesiveness can be acquired by mix | blending a suitable quantity. For example, there are rosin, hydrogenated rosin, esterified rosin, terpene, modified terpene resin, and the like. A preferred blending amount is 100 / weight ratio of APAO / tackifier resin.
10-100 / 100, preferably 100 / 30-100 / 60. When the tackifier resin is less than 10 parts by weight, the wettability of the precoat adhesive becomes poor at the time of vacuum forming, and the adhesiveness to the molded product is lowered. On the other hand, when it exceeds 100 parts by weight, the heat resistance is lowered. To do.

  Specific examples of the tackifier resin include YS resin PX1250 (softening point 125 ° C.), YS resin PX1150 (softening point 115 ° C.) and the like as terpene resins, and YS resin TO125 (softening point 125) as modified terpene resins. ), YS resin TO115 (softening point 110 ° C.), etc., hydrogenated terpene resins such as Clearon P125 (softening point 125 ° C.), Clearon P115 (softening point 115 ° C.), YS polystar U115 (softening point 115 ° C.), YS polystar 2130 (softening point 130 ° C), YS polystar 2115 (softening point 115 ° C), YS polystar S145 (softening point 145 ° C), YS polystar N125 (softening point 125 ° C), Mighty Ace G150 (softening point 150 ° C), Mighty Ace G125 (softening point 125 ° C), YS polystar T 130 (softening point 130 ° C.) (all of which are manufactured by Yasuhara Chemical Co., Ltd.), as terpene phenol resin, Tamanol 900 (softening point 120-135 ° C.), and rosin-modified phenol resin Tamanol 135 (softening point 130-140 ° C.) ( As described above, all are rosin esters such as pentalin 2541 (softening point 111-121 ° C.) (Rika Hercules Co., Ltd.), and modified rosin esters pentalin FK125 (softening point 122-128 ° C.) (Rika Hercules) As a maleic acid-modified rosin ester, there are pentaline 4741 (softening 120-130 ° C.) (manufactured by Rika Hercules Co., Ltd.) and the like.

  The C component of the hot melt adhesive used in the present invention includes polypropylene wax (C). The polypropylene wax (C) is a crystalline wax having a melting point of 120 ° C. or higher, preferably 120 to 170 ° C., more preferably 130 to 160 ° C. When other waxes are used, the melting point is low and sufficient heat resistance is not exhibited. As for the compounding quantity, it is preferable that the weight ratio of APAO / polypropylene wax is 100 / 50-100 / 100, especially 100 / 50-100 / 80. If the polypropylene wax is less than 50 parts by weight or more than 100 parts by weight, sufficient heat resistance cannot be obtained.

  Further, the hot melt adhesive composition of the present invention was selected from the group consisting of polyethylene, polypropylene and ethylene-styrene block copolymers for the purpose of adjusting viscosity, adjusting crystal speed, and adjusting adhesive properties at low temperatures. At least one polyolefin can be mixed. The amount used is 30% by weight or less, preferably 10% by weight or less, based on the entire adhesive composition.

  Examples of the antioxidant include hindered phenol antioxidants, phosphorus processing heat stabilizers, lactone processing heat stabilizers, sulfur heat resistance stabilizers, and the like.

  Moreover, various additives, such as an inorganic filler and a coloring agent, can be added as needed. Furthermore, in order to improve the compatibility of each component, various compatibilizers may be added.

  Each of these components becomes a hot melt adhesive by kneading with a kneader or the like under heating.

  When applying the hot melt adhesive composition thus obtained to the surface of the polyolefin foam on the surface of the skin material or the surface material, a roll coater, a die coater, a sprayer is used after the skin material is manufactured using a normal hot melt applicator. It may be applied directly by, for example, or may be applied to a release paper and then thermally transferred to the foam surface. Moreover, although application | coating thickness changes with smoothness etc. of the surface of the adherend used as a molded article, the film thickness of an adhesive bond layer is about 10-500 micrometers, More preferably, it is about 50-200 micrometers. That is, when the thickness is less than 10 μm, the adhesion area to the molded product becomes poor and the adhesiveness is lowered. On the other hand, when the thickness exceeds 500 μm, the skin material is not sufficiently softened within a predetermined time when the skin material is heated, and the wettability to the molded product cannot be obtained, and the adhesiveness decreases.

  As the skin material used in the present invention, heat-resistant plastic sheets such as polyvinyl chloride and thermoplastic polyolefin, and surface materials such as fiber materials such as tricot, woven fabric and non-woven fabric, or polypropylene, polyethylene, polybutylene and these olefins are used. This is a sheet-like material obtained by laminating a polyolefin-based foam produced by using the above copolymer as a main component and the surface layer agent by adhesion or heat fusion. The thickness of the skin material is generally about 0.3 to 1.5 mm, and the thickness of the polyolefin-based foam is generally about 1.5 to 3 mm. The molded products used here are injection molded products of various plastics such as acrylonitrile-butadiene-styrene resin (ABS resin), polypropyne, sheets, wood chips, essential powders, etc. with thermosetting resins and polyolefin resins. It means an essentially molded product or wood board hardened by hot press molding.

  The precoat skin material for automobile interior obtained by applying a hot melt adhesive can be cut into a predetermined size and mounted on a vacuum forming machine to be molded. In vacuum forming, the pre-coated skin material is softened by heating with hot air or far-infrared heat, and the adhesive surface of the pre-coated skin material is applied to the pre-coated skin material while evacuating from the molded product with micropores attached to the convex mold. It adheres to a molded product in close contact. At this time, the pre-coated skin material needs to be heated to a range of 100 ° C. to 150 ° C. at the time of bonding, but the molded product may be 5 ° C. or higher, and may be indoors adjusted to the living environment even in winter. In particular, it is not necessary to heat. Furthermore, when vacuum forming is mounted, a method of applying pressure from the skin surface with compressed air, a concave mold, a membrane or the like is also common, and preferable results are obtained. Further, since the molded product is used without heating, a line that has conventionally used a solvent-based adhesive or an emulsion-based adhesive can be used as it is. Furthermore, since it is a hot melt adhesive, there is a merit that it is solvent-free and has a great effect on the environment.

  Next, although an Example and a comparative example demonstrate this invention further in detail and the result of these specific examples is shown in Table 1, this invention is not limited by these examples. In the text, “parts” means parts by weight.

(Test method)
(Mounting test, heat-resistant creep) Immediately after bonding to the polypropylene plate, the skin material was cut into a width of 25 mm, peeled at 180 ° C. in a 20 ° C. atmosphere at a pulling rate of 200 mm / min, and the strength and fracture state were tested.

A: Interfacial fracture from polypropylene plate (poor evaluation),
B: Destruction of foam of skin material (good evaluation),
C: Cohesive failure of the hot melt adhesive (poor evaluation).

  Further, the same bonded product was subjected to a creep test in a 90 ° direction under a 100 g load in a 100 ° C. atmosphere for 24 hours to test the shift length and the fracture state.

Example 1
100 parts of APAO (melt viscosity about 1,500 mPa · s / 190 ° C.) (Ubetak UT2715; manufactured by Ube Industries Co., Ltd.) and tackifier resin (softening point 140 ° C. by ring and ball method) (Alcon P140; manufactured by Arakawa Chemical Co., Ltd.) ) 30 parts and 5 parts of Irganox 1010 (Antioxidant manufactured by Ciba Specialty Chemicals) are melted with a heating kneader heated to 170 ± 10 ° C. and kneaded for 2 hours. Thereafter, 50 parts of polypropylene wax (melting point: 145 ° C.) (Biscol 660P; manufactured by Sanyo Chemical Industries, Ltd.) was added and kneaded for 2 hours to obtain a hot melt adhesive (I). The hot melt adhesive (I) is applied to the surface of a polypropylene foam of an automobile interior skin material (a surface layer material made of a polyolefin-based sheet and a 15-fold foam 25 mm-thick laminate composed mainly of polypropylene; manufactured by Okamoto Co., Ltd.). Using a heated roll coater heated to 170 ° C., it was applied to a thickness of 100 μm to obtain a precoat skin material for automobile interior. The precoat skin material was heated to a surface temperature of 150 ° C. and adhered to a polypropylene plate by vacuum forming. The adhesive had good adhesion to the polypropylene plate from the beginning, and high heat resistance was obtained.

Example 2
In the same manner as in Example 1, 100 parts of APAO (melt viscosity of about 1,500 mPa · s / 190 ° C.) (Ubetak UT2715; manufactured by Ube Industries Co., Ltd.) and tackifying resin (Alcon P140; manufactured by Arakawa Chemical Co., Ltd.) 30 And 2 parts of Irganox 1010 (Antioxidant manufactured by Ciba Specialty Chemical Co., Ltd.) were melted with a heating kneader heated to 170 ± 10 ° C. and kneaded for 2 hours. Thereafter, 100 parts of polypropylene wax (Biscol 660P; manufactured by Sanyo Chemical Industries, Ltd.) was added and kneaded for 2 hours to obtain a hot melt adhesive (II). The hot melt adhesive had good adhesiveness to the polypropylene plate from the beginning, and high heat resistance was obtained.

Example 3
In the same manner as in Example 1, 100 parts of APAO (melt viscosity about 19,000 mPa · s / 190 ° C.) (Ubetac E27200; manufactured by Ube Industries, Ltd.) and tackifier resin (softening point 140 ° C. by ring and ball method) ( 30 parts of Alcon P140 (manufactured by Arakawa Chemical Co., Ltd.) and 2 parts of Irganox 1010 (antioxidant manufactured by Ciba Specialty Chemical Co., Ltd.) are melted with a heating kneader heated to 170 ± 10 ° C. and kneaded for 2 hours. Thereafter, 80 parts of polypropylene wax (Biscol 660P; manufactured by Sanyo Chemical Industries, Ltd.) was added and kneaded for 2 hours to obtain a hot melt adhesive (III). The adhesive had good adhesion to the polypropylene plate from the beginning, and high heat resistance was obtained.

Example 4
In the same manner as in Example 1, 100 parts of APAO (melt viscosity of about 50,000 mPa · s / 190 ° C.) (Best Plast 750; manufactured by Degussa) and tackifier resin (softening point 140 ° C. by ring and ball method) (Alcon P140 Melting 30 parts of Arakawa Chemical Co., Ltd. and 2 parts of Irganox 1010 (antioxidant manufactured by Ciba Specialty Chemical Co.) with a heating kneader heated to 170 ± 10 ° C. and kneading for 2 hours. Thereafter, 80 parts of polypropylene wax (Biscol 660P; manufactured by Sanyo Chemical Industries, Ltd.) was added and kneaded for 2 hours to obtain a hot melt adhesive (IV). The adhesive had good adhesion to the polypropylene plate from the beginning, and high heat resistance was obtained.

Example 5
In the same manner as in Example 1, 100 parts of APAO (melt viscosity 22,000 mPa · s / 190 ° C. (Best Plast 520; manufactured by Degussa)) and tackifier resin (softening point 140 ° C. by ring and ball method) (Arcon P140; 30 parts of Arakawa Chemical Co., Ltd.) and 2 parts of Irganox 1010 (Antioxidant manufactured by Ciba Specialty Chemical Co.) are melted in a heating kneader heated to 170 ± 10 ° C. and kneaded for 2 hours. -Based wax (Viscol 660P; manufactured by Sanyo Chemical Industries, Ltd.) 80 parts was added and kneaded for 2 hours to obtain a hot melt adhesive (V), which has good adhesiveness to the polypropylene plate from the beginning. Thus, high heat resistance was obtained.

Example 6
In the same manner as in Example 1, APAO (melt viscosity 19,000 mPa · s / 190 ° C. (Ubetak E27200; manufactured by Ube Industries, Ltd.), tackifier resin (softening point 140 ° C. by ring and ball method) (Alcon P140; Arakawa Chemical) Co., Ltd.) 30 parts and Irganox 1010 (Antioxidant manufactured by Ciba Specialty Chemicals Co., Ltd.) are melted in a heating kneader heated to 170 ± 10 ° C. and kneaded for 2 hours. (Biscol 660P; Sanyo Chemical Industries, Ltd.) 80 parts was added and kneaded for 2 hours to obtain a hot melt adhesive (VI), which had good adhesiveness to the polypropylene plate from the beginning, High heat resistance was obtained.

Example 7
In the same manner as in Example 1, 100 parts of APAO (melt viscosity of about 8,000 mPa · s / 190 ° C.) (Ubetak UT2780; Ube Industries, Ltd.) and tackifier resin (softening point 140 ° C. by ring and ball method) ( 80 parts of Alcon P140 (manufactured by Arakawa Chemical Co., Ltd.) and 2 parts of Irganox 1010 (antioxidant made by Ciba Specialty Chemical Co., Ltd.) are melted with a heating kneader heated to 170 ± 10 ° C. and kneaded for 2 hours. Thereafter, 80 parts of polypropylene wax (Biscol 660P; manufactured by Sanyo Chemical Industries, Ltd.) was added and kneaded for 2 hours to obtain a hot melt adhesive (VII). The adhesive had good adhesion to the polypropylene plate from the beginning, and high heat resistance was obtained.

Example 8
In the same manner as in Example 1, 100 parts of APAO (melt viscosity about 8,000 mPa · s / 190 ° C.) (Ubetak UT2780; manufactured by Ube Industries) and tackifying resin (softening point 140 ° C. by ring and ball method) (Alcon P140) Melting 100 parts of Arakawa Chemical Co., Ltd.) and 2 parts of Irganox 1010 (Antioxidant manufactured by Ciba Specialty Chemical Co.) with a heating kneader heated to 170 ± 10 ° C. and kneading for 2 hours. Thereafter, 80 parts of polypropylene wax (Biscol 660P; manufactured by Sanyo Chemical Industries, Ltd.) was added and kneaded for 2 hours to obtain a hot melt adhesive (VIII). The adhesive had good adhesion to the polypropylene plate from the beginning, and high heat resistance was obtained.

Comparative Example 1
The hot melt adhesive tackifying resin obtained in Example 1 was replaced with a tackifying resin having a low softening point (softening point of 100 ° C. by ring and ball method) (Alcon P100; manufactured by Arakawa Chemical Co., Ltd.), and an automotive interior skin material Was coated on a polypropylene foam surface and adhered to a polypropylene plate.

  In this bonded product, material destruction of the skin material was observed at 180 ° peeling, but displacement was observed at 100 ° C. creep.

Comparative Example 2
The hot-melt adhesive polypropylene wax (Biscol 660P; manufactured by Sanyo Chemical Industries Co., Ltd.) blended in Example 1 is used in an amount of 20 parts, pre-coated on the polypropylene foam surface of the automobile interior skin material, and bonded to the polypropylene plate. did.

  In this bonded product, material destruction of the skin material was observed at 180 ° peeling, but displacement was observed at 100 ° C. creep.

Comparative Example 3
The hot-melt adhesive obtained in Example 1 was mixed with a polypropylene wax (Biscol 660P; manufactured by Sanyo Chemical Industries Co., Ltd.) in an amount of 200 parts, pre-coated on the polypropylene foam surface of the automobile interior skin material, and adhered to the polypropylene plate. did.

  This bonded product had low adhesion to the polypropylene plate when peeled at 180 °, and displacement was observed even at 100 ° C. creep.

Comparative Example 4
Tackifier resin of hot-melt adhesive obtained in Example 1 (softening point 140 ° C. by ring and ball method) (Alcon P140; manufactured by Arakawa Chemical Co., Ltd.) 20 parts, polypropylene wax (Biscol 660P; Sanyo Chemical Industries) 120 parts by weight), pre-coated on the polypropylene foam surface of the automobile interior skin material, and adhered to the polypropylene plate.

  In this bonded product, material destruction of the skin material was observed at 180 ° peeling, but displacement was observed at 100 ° C. creep.

Claims (11)

  Amorphous-poly (α-olefin) (A) having a melt viscosity in the range of 500 to 100,000 mPa · s / 190 ° C., a tackifier resin (B) having a softening point of 110 ° C. or higher by the ring and ball method, and a melting point of 120 A hot-melt adhesive having a polypropylene wax (C) at a temperature of 0 ° C. or higher and having a weight ratio of (A) to (C) of 100/50 to 100/100 is applied in advance to the back surface of the automobile interior skin material. A precoat skin material for automobile interiors.   The precoated skin material according to claim 1, wherein the automobile interior skin material is made of a surface material alone, and the hot melt adhesive is directly applied directly to the back surface of the surface material.   3. The automobile interior skin material comprises a surface layer material and a polyolefin foam layer bonded or heat-sealed to the back surface thereof, and the hot melt adhesive is applied to the surface of the polyolefin foam layer. The precoat skin material as described in 2.   The precoat skin material according to any one of claims 1 to 3, wherein a weight ratio of the amorphous-poly (α-olefin) (A) / tackifier resin (B) is 100/10 to 100/100.   The precoat skin material according to any one of claims 1 to 4, wherein a coating thickness of the hot melt adhesive on the skin material is 10 to 500 µm.   The pre-coated skin material according to claim 4, wherein the hot melt adhesive further contains 30% by weight or less of polyolefin with respect to the adhesive.   The precoat skin material according to claim 3, wherein the skin material is a thermoplastic sheet or fiber material alone or a laminate of a polyolefin foam.   Amorphous-poly (α-olefin) (A) having a melt viscosity in the range of 500 to 50,000 mPa · s / 190 ° C., a tackifier resin (B) having a softening point of 110 to 180 ° C. or higher and a melting point Is an essential component of a polypropylene wax (C) having a temperature of 120 to 170 ° C. or higher, the weight ratio of (A) to (C) is 100/50 to 100/100, and the amorphous-poly (α-olefin) ( A precoat for automobile interior, wherein a hot melt adhesive having a weight ratio of A) / tackifier resin (B) of 100/10 to 100/100 is applied in advance to the back surface of the automobile interior skin material Skin material.   The precoated skin material according to claim 8, wherein the automobile interior skin material is made of a surface layer material alone, and the hot melt adhesive is directly applied directly to the back surface of the surface material.   The precoated skin material according to claim 8, wherein the automobile interior skin material comprises a surface layer material and a polyolefin foam layer bonded to the back surface thereof, and the hot melt adhesive is applied to the surface of the polyolefin foam layer. . A method for manufacturing an automobile interior material, comprising: contacting a pre-coated skin material according to any one of claims 1 to 10 with a molded product, and vacuum-bonding the molded product without heating.