JP2003211612A - Urethane resin skin material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a urethane resin skin material having good emboss transfer properties and flexibility, excellent in surface damage resistance and fire retardancy and capable of being subjected to the fusion bonding processing due to a high frequency welder and the sewing due to a sewing machine. <P>SOLUTION: The urethane resin skin material comprises a thermoplastic urethane resin layer 1 and a soft polyurethane slab foam layer 2 and is characterized in that emboss processing 3 is applied to the thermoplastic urethane resin layer 1 and the soft polyurethane slab foam layer 2 is compressed so that the thickness thereof is reduced to 10-60% of the original thickness thereof. The thermoplastic urethane resin layer 1 may by a mixed resin layer comprising 50-95 wt.% of thermoplastic polyurethane and 50-5 wt.% of an acrylic soft resin. Further, a backing layer 4 comprising a knitted fabric or a nonwoven fabric may be provided to the back surface of the soft polyurethane slab foam layer and the knitted fabric or the nonwoven fabric may be a knitted fabric or a nonwoven fabric having stretchability. Further, a thermoplastic urethane resin sheet is superposed on the soft polyurethane slab foam layer and pressed under heating by an embossing roller to be integrally laminated to the soft polyurethane slab foam layer and emboss processing is applied to the thermoplastic urethane resin sheet to manufacture the urethane resin skin material. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin material used as a vehicle interior material for automobiles, a saddle for motorcycles, and a surface material for furniture such as chairs. More specifically, the present invention relates to a thermoplastic urethane resin layer and a flexible polyurethane slab foam. The present invention relates to a skin material having a layer and an embossed surface.

[0002]

2. Description of the Related Art A skin material used as a material constituting a surface of a vehicle interior material for automobiles, a saddle for motorcycles, furniture such as chairs and sofas is required to be flexible and strong. Generally, a soft polyvinyl chloride layer is formed on the surface of a knitted or non-woven fabric, or a sheet base material such as polyolefin foam. This soft polyvinyl chloride has various hardnesses. For general film applications, 100 to 100 parts by weight of polyvinyl chloride and 30 to 50 parts by weight of a plasticizer (diethylhexyl phthalate) are mixed to obtain a hardness of However, when used as a skin material, a plasticizer of 70-
It is required to have a hardness when blended at 100 parts by weight, that is, a material that is considerably soft. By the way, in recent years, due to the problem of recycling, polyolefin resin leather using random polypropylene, ethylene-vinyl acetate resin, hydrogenated styrene butadiene rubber, etc. in place of soft polyvinyl chloride, and thermoplastic polyurethane leather have been proposed.

Conventionally, as a thermoplastic polyurethane leather, there is known a leather in which a thermoplastic polyurethane layer is formed on a base material of knitted fabric or nonwoven fabric via a soft polyurethane foam layer. Various methods are conceivable for forming the flexible polyurethane foam layer on the base material through the flexible polyurethane foam layer. However, when a foamed flexible polyurethane mold foam is used, the skin layer of the foam has Therefore, there is a problem that the adhesiveness to the substrate or the thermoplastic polyurethane layer is poor. In addition, the method of applying unfoamed polyurethane to the substrate, laminating the thermoplastic polyurethane layer on it, and then foaming the unfoamed polyurethane makes it difficult to obtain a homogeneous product, and the deterioration of urethane due to heating is large. There is a problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and solves the above problems, and has excellent emboss transfer property, flexibility and resistance to surface scratches.
An object of the present invention is to provide a urethane resin-based skin material that can be welded by a high-frequency welder and can be sewn on a sewing machine, and a method for manufacturing the same.

[0005]

That is, the present invention comprises a thermoplastic urethane resin layer and a flexible polyurethane slab foam layer, wherein the thermoplastic urethane resin layer is embossed and the flexible polyurethane slab foam layer has the original thickness. The urethane resin-based skin material is characterized by being compressed and reduced to a thickness of 10 to 60% of the thickness. The thermoplastic urethane resin layer may be a mixed resin layer of 50 to 95 wt% of thermoplastic polyurethane and 50 to 5 wt% of acrylic soft resin. A backing layer of knitted fabric or non-woven fabric may be provided on the back surface of the flexible polyurethane slab foam layer.
This knitted fabric or nonwoven fabric may be a stretchable knitted fabric or nonwoven fabric.

In the present invention, a flexible polyurethane slab foam sheet or a flexible polyurethane slab foam sheet lined with a knitted fabric or a non-woven fabric is overlaid with a thermoplastic urethane resin sheet and heated with an embossing roller,
A urethane resin system characterized in that the thermoplastic urethane resin layer is embossed on the thermoplastic urethane resin layer under pressure, and the flexible polyurethane slab foam layer is compressed and reduced to 10 to 60% of its original thickness. It is a method of manufacturing a skin material. The thermoplastic urethane resin sheet may be a sheet of a mixed resin of 50 to 95 wt% of thermoplastic polyurethane and 50 to 5 wt% of acrylic soft resin. The knitted woven fabric or nonwoven fabric may be a stretchable knitted woven fabric or nonwoven fabric.

[0007]

FIG. 1 is a sectional view showing an example of the urethane resin-based skin material of the present invention. In FIG. 1, 1
Is a thermoplastic urethane resin layer, 2 is a soft polyurethane slab foam layer, and 3 is an emboss. 4 is a backing layer of knitted woven fabric or nonwoven fabric. In this example, the emboss 3 applied from the surface of the thermoplastic urethane resin layer 1 by the embossing roller is the soft polyurethane slab foam layer 2
Has reached. Flexible polyurethane slab foam layer 2
Has been reduced in thickness to 10-60% of its original thickness. The thickness t of the soft polyurethane slab foam layer 2 of the embossed urethane resin-based skin material of the present invention is the distance from the top of the embossed diaphragm of the foam layer to the backing layer, as shown in FIG. .

The thermoplastic urethane resin layer in the skin material of the present invention is a layer of thermoplastic polyurethane or a mixed resin mainly composed of thermoplastic polyurethane. The thermoplastic polyurethane can be obtained by reacting a diisocyanate compound with a compound having two or more hydroxyl groups. Among them, a polyurethane-based thermoplastic elastomer (TPU) composed of a so-called soft segment and a hard segment, which is composed of a long chain polyol, a diisocyanate and a chain extender, can be preferably used. These preferably have a Shore A hardness of 65 to 95, and particularly 70 to 80.

Examples of the diisocyanate compound for synthesizing the thermoplastic polyurethane include tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, tolidine diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated dicyclohexylmethane diisocyanate, isophorone. Diisoianate or the like is used.

As the compound having two or more hydroxyl groups, a polyester polyol which is a condensation reaction product of a dibasic acid such as adipic acid or phthalic acid and a glycol such as ethylene glycol or 1,4-butanediol;
A polycarbonate-based polyol which is a reaction product of a carbonate such as ethylene carbonate and a glycol; a polyether-based polyol such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyethylene glycol-polypropylene glycol, or the like is used. In the synthetic resin leather of the present invention, it is preferable to use a polyether polyol because of its physical properties. Further, the thermoplastic polyurethane using a polyether polyol as a raw material has good aging resistance and calender processability, and is also preferable from this viewpoint.

As the chain extender, ethylene glycol,
Low molecular weight polyhydric alcohol such as 1,2-propylene glycol, 1,3-propylene glycol, butane 1,2 diol, butane 1,3 diol, butane 1,4 diol, butane 2,3 diol, hexane diol, or diamine , Water is used.

In the skin material of the present invention, as the thermoplastic urethane resin, a mixed resin of the above-mentioned thermoplastic polyurethane and an acrylic soft resin described later can be used. This mixed resin has an advantage that it can be favorably calendered, is excellent in flexibility, resilience, cold resistance and tear strength, and has an advantage that it can be welded by a high frequency welder. The blending ratio of the thermoplastic polyurethane and the acrylic soft resin is 50 to 95% by weight of the thermoplastic polyurethane,
Acrylic soft resin 60 to 5% by weight, preferably thermoplastic polyurethane 60 to 90% by weight, acrylic soft resin 40 to 10% by weight, more preferably thermoplastic polyurethane 70 to 90% by weight, acrylic soft resin 30 to 10% % By weight. If the thermoplastic polyurethane content is less than 50% by weight, the tear strength is not sufficient, and the seams tend to spread or tear when sewn. On the other hand, thermoplastic polyurethane is 9
If it exceeds 5% by weight, a hard feel is obtained.

The acrylic soft resin used in the present invention is a resin having flexibility like ordinary polyvinyl chloride at room temperature. This acrylic soft resin is preferably a multilayer structure polymer, that is, a polymer in which two or more kinds of acrylic polymers form a core-shell type multilayer structure. These acrylic soft resins exhibit good flexibility at room temperature, have bending durability, and are excellent in weather resistance. An example of the acrylic soft resin used in the present invention will be shown. 30 to 99.9% by weight of at least one acrylic acid alkyl ester having an alkyl group having 1 to 12 carbon atoms and at least one methacrylic acid alkyl ester having an alkyl group having 1 to 8 carbon atoms 0
-70% by weight, 0-30% by weight of copolymerizable unsaturated monomer, 0.1-10% by weight of polyfunctional crosslinking monomer and / or polyfunctional grafting monomer 10 to 90 parts by weight of at least one polymer layer [A] having a Tg of 30 ° C. or lower and at least one alkyl acrylate ester having an alkyl group of 1 to 12 carbons 30 to 99 parts by weight %, At least one methacrylic acid alkyl ester having an alkyl group having 1 to 8 carbon atoms 1 to 7
0% by weight, Tg of -20 to 50 obtained by polymerizing a monomer mixture consisting of 0 to 30% by weight of a copolymerizable unsaturated monomer
It is a multi-layer structure polymer composed of a combination of 90 to 10 parts by weight of at least one polymer layer [B] at 0 ° C., and an acrylic soft multi-layer structure resin in which the outermost layer is the polymer layer [B]. .

Another example of the acrylic soft resin will be shown. 60 to 99.5% by weight of alkyl acrylate having an alkyl group having 1 to 8 carbon atoms, 0 to 39.5% by weight of a monofunctional monomer having one copolymerizable vinyl group, and a vinyl group or vinylidene. Rubber layers 30 to 8 obtained by polymerizing 0.5 to 5% by weight of a polyfunctional monomer having at least two groups
Monomers having 0 parts by weight, 40 to 100% by weight of methyl methacrylate, 0 to 60% by weight of alkyl acrylate having an alkyl group having 1 to 8 carbon atoms, and a copolymerizable vinyl group or vinylidene group. It is an acrylic soft multilayer structure resin composed of 20 to 70 parts by weight of a hard resin layer obtained by polymerizing 0 to 20% by weight, and the outermost layer is a hard resin layer.

Further, another example of the acrylic soft resin will be shown. (A) 80 to 98.99% by weight of methyl methacrylate, 1 to 20% by weight of alkyl acrylate having an alkyl group having 1 to 8 carbon atoms, and a polyfunctional grafting agent of 0.0
5 to 30 parts by weight of the innermost hard polymer layer obtained by polymerizing a monomer mixture consisting of 1 to 1% by weight and a polyfunctional crosslinking agent 0 to 0.5% by weight; (B) a carbon number of 1 to 8 70 to 99.5% by weight of alkyl acrylate having an alkyl group of
Methyl methacrylate 0-30% by weight, polyfunctional grafting agent 0.5-5% by weight and polyfunctional crosslinking agent 0-5% by weight
20 to 45 parts by weight of a hard polymer layer as an intermediate layer obtained by polymerizing a monomer mixture consisting of: (C) methyl methacrylate 9
The outermost hard polymer layers 50 to 7 obtained by polymerizing a monomer mixture of 0 to 99% by weight and 10 to 1% by weight of an alkyl acrylate having an alkyl group having 1 to 8 carbon atoms.
It is an acrylic soft multi-layer structure resin composed of 5 parts by weight and having an average particle size of 0.01 to 0.3 μm.

By blending a plasticizer into the above-mentioned thermoplastic urethane resin layer, the flexibility and feel of the product can be improved. In addition, the blending of the plasticizer can lower the processing temperature of the calendar processing of the mixed resin, and therefore can suppress the decomposition of the thermoplastic polyurethane during processing. Examples of the plasticizer include phthalic acid esters such as di-2-ethylhexyl phthalate, isobutyl phthalate and diisodecyl phthalate; trimellitic acid esters such as tri-2 ethylhexyl trimellitate; di-2 ethylhexyl adipate and di-isononyl adipate. , Aliphatic dibasic acid esters such as di-2 ethylhexyl sebacate; epoxidized soybean oil, epoxy-based plasticizers such as butyl epoxystearate, phosphate ester-based such as tricresyl phosphate, and citric acid such as tributyl acetylcitrate Esters and the like are used. Among these, aromatic carboxylic acid esters such as phthalic acid esters and trimellitic acid esters are particularly preferably used from the viewpoints of high plasticization efficiency and less problems such as bleeding. The blending amount of the plasticizer is 100
The amount is 0 to 50 parts by weight, preferably 3 to 20 parts by weight. Mixing in a large amount is not preferable because it causes migration and bleeding.

In the above thermoplastic urethane resin layer, if necessary, a lubricant usually used for compounding synthetic resin,
An ultraviolet absorber, a light stabilizer, a pigment, an antibacterial agent, etc. may be blended. As the lubricant, aliphatic metal salts of stearic acid such as calcium, magnesium, zinc and barium, polyethylene wax, stearic acid, alkylenebis fatty acid amide and the like are used. 2- (2'-hydroxy-5'-methylphenyl) as UV absorber
Benzotriazole-based UV absorbers such as benzotriazole are used. Bis- (2
A hindered amine light stabilizer such as 2,6,6-tetramethyl-4-piperidyl) sebacate is used.
As the antibacterial agent, a silver-based inorganic antibacterial agent or the like is used.

The soft polyurethane slab foam layer in the skin material of the present invention is composed of a foam sheet obtained by cutting a soft polyurethane slab foam produced by a conventional method to an appropriate thickness. The raw material soft polyurethane is produced, for example, by using the following polyether type polyol or polyester type polyol and diisocyanate such as tolylene diisocyanate as the raw material. Here, the polyether type polyol is polyethylene glycol, polypropylene glycol, a polyethylene adduct of glycerin (molecular weight 3000 to 4000) and the like. The polyester type polyol is a polyester having hydroxyl groups at both terminals, which is obtained by condensing a polyol such as ethylene glycol, propylene glycol or sorbitol with a dicarboxylic acid such as oxalic acid, succinic acid or maleic acid.
By using a soft polyurethane slab foam sheet obtained by cutting a slab-molded soft polyurethane foam to an appropriate thickness, the emboss transfer property and the adhesive property with a thermoplastic urethane resin can be improved. The density of this flexible polyurethane slab foam sheet is 10-50.
kg / m ³ is preferred.

The flexible polyurethane slab foam layer may be a single layer or may be lined with a knitted fabric or a non-woven fabric. Materials for these knitted fabrics include polyamide fibers, polyester fibers, acrylic fibers, polypropylene fibers, cotton, rayon, and mixed yarns of these. The knitted fabric may be a double-sided knitted fabric, a plain knitted fabric, or the like, and the woven fabric may be a plain woven fabric, a twilled fabric, a satin woven fabric, or the like. In order to laminate a knitted woven fabric or a nonwoven fabric on a flexible polyurethane slab foam sheet, the use of a liquid adhesive makes the laminate uncomfortable to handle, so flame fusion (frame lamination) or adhesion by a hot melt film is preferable. A skin material lined with a knitted woven fabric or a non-woven fabric can be sewn. Further, a stretchable knitted fabric or nonwoven fabric can be used as the knitted fabric or nonwoven fabric. The skin material using this stretchable knitted fabric or nonwoven fabric is suitable for vacuum (pressure) forming.

The skin material of the present invention is manufactured as follows. That is, for example, a thermoplastic polyurethane or a mixed resin of a thermoplastic polyurethane and an acrylic soft resin in a predetermined ratio is blended with an additive such as a plasticizer and a lubricant, if necessary, and well kneaded, followed by calendar molding or A thermoplastic urethane resin sheet is prepared by extrusion into a sheet having a thickness of 0.1 to 1.0 mm. On the other hand, a slab of soft polyurethane slab-molded to a density of 10 to 50 kg / m ³ is cut into a thickness of 1 to 5 mm to prepare a soft polyurethane slab foam sheet, and a knitted woven fabric or a non-woven fabric is lined as necessary. On the soft polyurethane slab foam sheet prepared above, the above-mentioned thermoplastic urethane resin sheet is overlaid, then, if necessary, marble printed, coated with a matting agent, and then the sheet is heated to 150 to 200 ° C. , Press with a squeeze roll.
By this pressurization, they are laminated and integrated to obtain a skin material in which the soft polyurethane slab foam layer is embossed together with the thermoplastic urethane resin layer. At the time of this pressurization, the thickness of the flexible polyurethane slab foam sheet is 1% of the original thickness.
Compress and reduce the thickness to 0-60%. By this compression thickness reduction, a skin material having good adhesiveness, embossed transferability and texture can be obtained. When the thickness is greatly reduced to less than 10% of the original thickness, the texture of the skin material as a foamed product is insufficient. When the thickness is reduced to 10 to 40% of the original thickness, an extremely good product as a skin material can be obtained. Also, if the thickness reduction is reduced to a thickness exceeding 60% of the original thickness, avatars will occur, causing seat bending (when the skin material is bent, it does not bend naturally but deeply. Phenomenon that causes creases) is lost and commercialability is lost.

The above-mentioned thermoplastic urethane resin sheet is preferably formed by calendering, but by blending the resin with a (meth) acrylic polymer, the melt tension during calendering can be adjusted, and calendering can be performed. Can be smoothed. This (meth) acrylic polymer is, for example, 50 to 90% by weight of methyl methacrylate.
And other ethylenically unsaturated monomers copolymerizable therewith 5
Molecular weight 50-500 obtained by copolymerizing 0-5% by weight
Most copolymers are preferred. Other ethylenically unsaturated monomers include, for example, methacrylic acid esters of alcohols having 2 to 18 carbon atoms, acrylic acid esters of alcohols having 2 to 18 carbon atoms, styrene, α-methylstyrene, acrylonitrile, maleic acid, and itacone. Such as acids. (Meta)
The amount of the acrylic polymer compounded is 0 to 30 parts by weight, preferably 2 to 10 parts by weight, based on 100 parts by weight of the mixed resin.

Further, by mixing the thermoplastic urethane resin with an inorganic substance powder such as calcium carbonate, antimony oxide, colloidal silica, magnesium silicate or magnesium hydroxide, the tackiness at the time of calendering is reduced to give a calender. Processing can be smoothed. Calcium carbonate is particularly preferable. The amount of the inorganic compounded is 0 to 30 parts by weight, preferably 5 to 100 parts by weight of the mixed resin.
20 parts by weight.

The skin material of the present invention is excellent in so-called sticking property and high-frequency welder property, and is used for vehicle interiors such as automobiles (seats, headrests, tonneau covers, sun visors, ceilings, etc.), interior interior materials, and motorcycle saddles. It is suitable for the skin material of, and the skin material of furniture (chair, sofa, etc.). A product lined with a knitted woven fabric or a non-woven fabric is suitable for a product to be sewn, and a product lined with a stretchable knitted fabric or a non-woven fabric is suitable for a vacuum (compressed) molding material.

[0024]

Example Production of thermoplastic urethane resin sheet: thermoplastic polyurethane (UHE-75A: manufactured by Mitsubishi Chemical Corporation, polyurethane using special ether-based polyol, Shore A hardness 75), thermoplastic polyurethane (UE
-80: manufactured by Mitsubishi Chemical Co., using ether polyol, Shore A hardness 80), acrylic soft resin (SA-100)
00P: manufactured by Kuraray Co., Ltd., methyl methacrylate-alkyl acrylate copolymer (metabrene P-530A:
Mitsubishi Rayon Co., Ltd.), calcium carbonate (NS-
A: Nitto Koka Kogyo Co., Ltd.), antioxidant (PEP-36: Asahi Denka Kogyo Co., Ltd.), plasticizer (# 124: Kao Co., phthalate ester), lubricant (polyethylene wax), UV absorption. An agent (benzotriazole type), a light stabilizer (HALS) and a pigment were mixed in the proportions shown in Table 1 (numerals indicate parts by weight) and calendered to a thickness of 0.
A 15 mm thermoplastic urethane resin sheet was molded. Example 1 On a polyether-based soft polyurethane slab foam sheet having a thickness of 3 mm and a density of 40 kg / m ³ (500EA: manufactured by Kurashiki Spinning Co., Ltd.), a composition having a composition of 0.15 mm shown in Example 1 of Table 1 was formed. The thermoplastic urethane resin sheets of 1 were stacked, heated to 180 ° C., passed through an embossing roller, and embossed at the same time as heat lamination. Embossing was performed from the surface of the thermoplastic urethane resin sheet. Thickness 1.0 mm (The thickness of the flexible polyurethane slab foam sheet layer is about 0.8
A good embossed transfer skin material of 5 mm (compressed to 28% of the original thickness) was obtained. This skin material was suitable as a laminated skin material for a saddle of a motorcycle.
The thickness of the flexible polyurethane slab foam sheet layer was measured with a caliper by making a notch and exposing the cross section.

Example 2 On a 30th polyester / rayon blended smooth knitted fabric, a hot melt film (made by Aicello Kagaku Co., Ltd.), a polyether type soft polyurethane slab foam sheet (thickness 3 mm and density 40 kg / m ³ ) (500E)
(A: manufactured by Kurashiki Spinning Co., Ltd.) and thermoplastic urethane resin sheets having a composition shown in Example 2 of Table 1 and having a thickness of 0.15 mm are sequentially stacked, heated to 180 ° C., and passed through an embossing roller to heat four layers. It was embossed at the same time as it was laminated.
Embossing was performed from the surface of the thermoplastic urethane resin sheet.
A well embossed transferred skin material having a thickness of 1.2 mm (the flexible polyurethane slab foam sheet layer was compressed to a thickness of about 0.75 mm (25% of the original thickness)) was obtained. This skin material was suitable as a sewing skin material for chairs.

Example 3 A soft polyurethane slab foam sheet of polyester type having a thickness of 3 mm and a density of 30 kg / m ³ (40M5: manufactured by Kurashiki Spinning Co., Ltd.) was frame-laminated with a Woolie nylon plain knit fabric having a thickness of 0.2 mm. On the soft polyurethane slab foam layer surface of this laminate, a 0.15 mm thick thermoplastic urethane resin sheet having the composition shown in Example 1 of Table 1 was overlaid, heated to 180 ° C., passed through an embossing roller, and heat-laminated while simultaneously embossing. did.
Embossing was performed from the surface of the thermoplastic urethane resin sheet.
A well embossed transferred skin material having a thickness of 1.1 mm (the flexible polyurethane slab foam sheet layer was compressed to a thickness of about 0.75 mm (25% of the original thickness)) was obtained. This skin material was suitable as a high-frequency welder-applied skin material for a motorcycle saddle.

Example 4 On a 210 denier polyurethane elastic yarn (spandex) plain weave fabric, a polyether type soft polyurethane slab foam sheet (500 EA: manufactured by Kurashiki Spinning Co., Ltd.) having a thickness of 3 mm and a density of 40 kg / m ³ was prepared. And a thermoplastic urethane resin sheet having a composition of 0.15 mm and having a composition shown in Example 4 in Table 1 (coated with a urethane-based adhesive), successively laminated, 1
It was heated to 80 ° C., passed through an embossing roller, heat laminated, and simultaneously embossed. Embossing was performed from the surface of the thermoplastic urethane resin sheet. 1.2mm thick (Soft polyurethane slab foam sheet layer has a thickness of about 0.75
A well embossed transfer skin material (compressed to 25 mm (25% of the original thickness)) was obtained. This skin material was suitable as a vacuum forming skin material for a saddle of a motorcycle.

Example 5 Polyether soft polyurethane slab foam having a thickness of 3 mm and a density of 40 kg / m ³ on a polyurethane spunbonded nonwoven fabric (Espancione UHF80: manufactured by Kanebo Gosei Co., Ltd.) having a thickness of 0.31 mm. Sheet (5
00EA: manufactured by Kurashiki Spinning Co., Ltd., and Example 5 in Table 1.
Thermoplastic urethane resin sheets with a thickness of 0.15 mm having the composition shown in are sequentially stacked, and a urethane adhesive is used at 180 ° C.
It was heated to, passed through an embossing roller, heat laminated, and simultaneously embossed. Embossing was performed from the surface of the thermoplastic urethane resin sheet. Thickness 1.2mm (Soft polyurethane slab foam sheet layer is about 0.74mm thick
A good embossed transferred skin material (compressed to 25% of the original thickness) was obtained. This skin material was suitable as a vacuum forming skin material for a saddle of a motorcycle.

Example 6 On a polyether type soft polyurethane slab foam sheet (500EA: manufactured by Kurashiki Spinning Co., Ltd.) having a thickness of 3 mm and a weight of 40 kg / m ³ , a composition having a composition of 0 in Example 6 in Table 1 was used. A 15 mm thermoplastic urethane resin sheet is laminated with a calendar tick-off roll. Then 180
It was heated to ℃, passed through an embossing roller, and embossed.
Embossing was performed from the surface of the thermoplastic urethane resin sheet.
A well embossed transfer skin material having a thickness of 1.0 mm (the flexible polyurethane slab foam sheet layer was compressed to a thickness of about 0.85 mm (28% of the original thickness)) was obtained. This skin material was suitable as a laminated skin material for a saddle of a motorcycle.

Examples 7 to 9 and Comparative Examples 1 to 2 The execution of Table 1 was performed on a polyether type soft polyurethane slab foam sheet (500EA: manufactured by Kurashiki Spinning Co., Ltd.) having a thickness of 3 mm and a density of 40 kg / m ^3. Thermoplastic urethane resin sheets having a composition shown in Examples 7 to 9 and Comparative Examples 1 to 2 and having a thickness of 0.15 mm were stacked, heated to 180 ° C., passed through an embossing roller, and embossed at the same time as heat lamination.
Embossing was performed from the surface of the thermoplastic urethane resin sheet.
And the skin gap material of Examples 7-9 of Table 1 and Comparative Examples 1-2 was produced, changing the roll gap conditions at the time of this embossing process. For each, the thickness of the skin material and the thickness of the foam sheet layer were measured. The residual thickness ratio of the foam sheet layer after embossing (that is, the percentage of the thickness of the foam layer after embossing with respect to the thickness of the foam sheet layer before embossing) was calculated, and the texture was examined.
The results are shown in Table 1 together with the results of Examples 1 to 6.

[0031]

[Table 1]

[0032]

EFFECT OF THE INVENTION The urethane resin-based skin material of the present invention has a good emboss transfer property, and thus can be beautifully embossed and has excellent durability. Further, it has good flexibility, restorability, cold resistance, surface scratch resistance, and flame retardancy. Further, it has the advantage that it can be sewn on a sewing machine and can be welded by a high-frequency welder. Therefore, it is useful as a vehicle interior material for automobiles, a bag material, and a skin material for furniture, which can replace the conventional skin material using soft polyvinyl chloride.

[Brief description of drawings]

FIG. 1 is a sectional view of a skin material of the present invention.

[Explanation of symbols]

1 thermoplastic urethane resin layer, 2 soft polyurethane slab foam layer, 3 embossing, 4 backing layer

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 4F100 AK25A AK51A AK51B AL05A                       BA02 BA03 BA07 BA10A                       BA10C DG12C DG15C DJ01B                       EJ17B EJ40A GB33 JB16A                       JJ07 JK08C JK13B JK14                       JK17B JL01

Claims (6)

[Claims] 1. A thermoplastic urethane resin layer and a soft polyurethane slab foam layer, wherein the thermoplastic urethane resin layer is embossed, and the soft polyurethane slab foam layer has a thickness of 10 to 60% of its original thickness. Urethane resin-based skin material characterized by being compressed and reduced in thickness. 2. A thermoplastic urethane resin layer comprising 50 to 95% by weight of thermoplastic polyurethane and 50 to 50% of acrylic soft resin.
The urethane resin-based skin material according to claim 1, which is a mixed resin layer with 5% by weight. 3. The urethane resin-based skin material according to claim 1, wherein a backing layer made of a knitted woven fabric or a non-woven fabric is provided on the back surface of the flexible polyurethane slab foam layer. 4. The urethane resin-based skin material according to claim 3, wherein the knitted woven fabric or nonwoven fabric is a stretchable knitted woven fabric or nonwoven fabric. 5. A flexible polyurethane slab foam sheet,
Alternatively, on a soft polyurethane slab foam sheet lined with a knitted woven fabric or a non-woven fabric, a thermoplastic urethane resin sheet is overlaid, heated and pressed by an embossing roller to be laminated and integrated, and the thermoplastic urethane resin layer is embossed, and A method for producing a urethane resin-based skin material, which comprises compressing and reducing the thickness of the flexible polyurethane slab foam layer to 10 to 60% of the original thickness. 6. A thermoplastic urethane resin sheet comprising 50 to 95% by weight of thermoplastic polyurethane and acrylic soft resin 5.
The method for producing a urethane resin-based skin material according to claim 5, which is a sheet of a mixed resin with 0 to 5% by weight.