Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
  • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
  • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
  • D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
  • C08G18/44—Polycarbonates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
  • C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic

Definitions

• the present invention relates to a synthetic leather that does not cause deformation or the like even when sunscreen cream is attached.
• Polyurethane resins are widely used in various fields such as films, adhesives, automobile interior materials, and abrasives because they have excellent mechanical strength. Among them, in recent years, since the excellent texture can be obtained due to the flexibility of the polyurethane resin, many studies have been made for synthetic leather applications (see, for example, Patent Document 1).
• Polyurethane resins used for the production of the synthetic leather have recently been required to have high durability especially for automobile interior materials. Above all, in vehicle interior materials, in addition to conventional durability (heat resistance, light resistance, hydrolysis resistance, etc.), excellent chemical resistance to sunscreen cream is required. However, the fact is that no material having excellent chemical resistance to sunscreen cream has yet been found.
• the problem to be solved by the present invention is to provide a synthetic leather which does not cause deformation or the like even when sunscreen cream adheres.
• the present invention relates to a synthetic leather in which a base fabric (i), an adhesive layer (ii), an intermediate layer (iii), and a skin layer (iv) are sequentially laminated, and the intermediate layer (iii) is a polycarbonate polyol.
• the synthetic leather of the present invention does not cause deformation or the like even when sunscreen cream adheres (hereinafter abbreviated as “chemical resistance”).
• the synthetic leather of the present invention is a synthetic leather in which a base fabric (i), an adhesive layer (ii), an intermediate layer (iii), and an outer skin layer (iv) are sequentially laminated, and the intermediate layer (iii) Polyurethane resin (W) which is a reaction product of polyol (X) containing 70% by mass or more of polycarbonate polyol (x-1), aliphatic or alicyclic polyisocyanate (Y), and chain extender (Z) It is formed by the polyurethane resin composition containing this.
• the skin layer (iv) can be formed by a known method using a known material.
• a solvent-based urethane resin, a water-based urethane resin, a solvent-free urethane resin, a silicone resin, a polypropylene resin, a polyester resin, or the like is used. be able to.
• the intermediate layer (iii) is a reaction product of a polyol (X) containing 70% by mass or more of a polycarbonate polyol (x-1), an aliphatic or alicyclic polyisocyanate (Y), and a chain extender (Z). It is formed by the polyurethane resin composition containing the polyurethane resin (W) which is.
• the polyurethane resin composition used for the intermediate layer (iii) is: 1) use a specific amount or more of polycarbonate polyol (x-1) having excellent chemical resistance; 2) lower cohesive force than aromatic polyisocyanate. Since an aliphatic or cycloaliphatic polyisocyanate (Y) is used, it can be relaxed between the polymers of the polyurethane resin when sunscreen is attached, and there is no deformation such as swelling, and the shape of the synthetic leather is maintained. It is thought that it was possible. Moreover, it is thought that the effect improved more by introduce
• the synthetic leather of the present invention has excellent chemical resistance against various sunscreens by forming the intermediate layer (iii) with a specific polyurethane resin.
• a specific polyurethane resin For example, Neutrogena (registered trademark), which is known as sunscreen cream, has an ultraviolet absorbent having a hydroxyl group such as 2-hydroxy-4-methoxybenzophenone and 3,3,5-trimethylcyclohexyl salicylate contained in synthetic leather.
• the chemical resistance test using this becomes a very severe test because it leads to poor chemical resistance due to the affinity with the urethane bond in the polyurethane resin to be constituted.
• the synthetic leather of the present invention exhibits excellent chemical resistance even when the Neutrogena is used.
• polycarbonate polyol (x-1) for example, a reaction product of a carbonate ester and / or phosgene and a compound having two or more hydroxyl groups can be used.
• carbonate ester examples include dimethyl carbonate, diethyl carbonate, diphenyl carbonate, ethylene carbonate, and propylene carbonate. These compounds may be used alone or in combination of two or more.
• Examples of the compound having two or more hydroxyl groups include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,3-butanediol, 1,2-butanediol, and 2-methyl.
• the number average molecular weight of the polycarbonate polyol (x-1) is preferably in the range of 500 to 8,000, more preferably in the range of 700 to 5,000, from the viewpoint that even better chemical resistance is obtained. More preferably, the range is in the range of 800 to 3,000.
• the number average molecular weight of the polycarbonate polyol (x-1) is a value measured by a gel permeation chromatography (GPC) method.
• the polyol (X) contains 70% by mass or more of the polycarbonate polyol (x-1) in order to obtain excellent chemical resistance.
• Other polyols that can be used in addition to the polycarbonate polyol (x-1) include, for example, polyoxyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol, polyoxyethylene polyoxypropylene glycol, polyoxyethylene poly Polyether polyols such as tetramethylene glycol; polyester polyols; polyacrylic polyols and the like can be used. These polyols may be used alone or in combination of two or more.
• the number average molecular weight of the other polyol is preferably in the range of 500 to 10,000, more preferably in the range of 700 to 5,000.
• the number average molecular weight of the other polyol is a value obtained by measurement in the same manner as the number average molecular weight of the polycarbonate polyol (x-1).
• Examples of the aliphatic or alicyclic polyisocyanate (Y) include tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, dodecamethylene diisocyanate, trimethylhexamethylene diisocyanate, 1,3-cyclopentylene diisocyanate, 1,3.
• polyisocyanates may be used alone or in combination of two or more. Among these, it is preferable to use isophorone diisocyanate and / or dicyclohexylmethane diisocyanate from the viewpoint that much more excellent chemical resistance is obtained.
• an aromatic polyisocyanate may be used in combination as long as the effects of the present invention are not impaired.
• aromatic polyisocyanate examples include 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 1-methyl-2,4-phenylene diisocyanate, 1-methyl-2,6-phenylene diisocyanate, 1-methyl- 2,5-phenylene diisocyanate, 1-methyl-3,5-phenylene diisocyanate, 1-ethyl-2,4-phenylene diisocyanate, 1-isopropyl-2,4-phenylene diisocyanate, 1,3-dimethyl-2,4- Phenylene diisocyanate, 1,3-dimethyl-4,6-phenylene diisocyanate, 1,4-dimethyl-2,5-phenylene diisocyanate, diethylbenzene diisocyanate, diisopropylbenzene diisocyanate, 1-methyl-3, Diethylbenzene diisocyanate, 3-methyl-1,5-diethylbenzene-2,4-diiso
• chain extender (Z) for example, a chain extender having an amino group, a chain extender having a hydroxyl group, or the like can be used. These chain extenders may be used alone or in combination of two or more. Among these, it is preferable to use a chain extender (c-1) having an amino group from the viewpoint of obtaining even better chemical resistance.
• chain extender having an amino group examples include ethylenediamine, 1,2-propanediamine, 1,6-hexamethylenediamine, piperazine, 2-methylpiperazine, 2,5-dimethylpiperazine, isophoronediamine, 4,4. '-Dicyclohexylmethanediamine, 3,3'-dimethyl-4,4'-dicyclohexylmethanediamine, 1,2-cyclohexanediamine, 1,4-cyclohexanediamine, aminoethylethanolamine, hydrazine, diethylenetriamine, triethylenetetramine, etc. Can be used. These chain extenders may be used alone or in combination of two or more. Among these, it is preferable to use isophorone diamine and / or dicyclohexylmethane diamine from the viewpoint that much more excellent chemical resistance is obtained.
• chain extender having a hydroxyl group examples include ethylene glycol, diethylene recall, triethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, hexamethylene glycol, Aliphatic polyol compounds such as sucrose, methylene glycol, glycerin, sorbitol; bisphenol A, 4,4′-dihydroxydiphenyl, 4,4′-dihydroxydiphenyl ether, 4,4′-dihydroxydiphenyl sulfone, hydrogenated bisphenol A, hydroquinone, etc. Aromatic polyol compounds; water and the like can be used. These chain extenders may be used alone or in combination of two or more.
• the polyurethane resin (W) for example, after the polyol (X) and preferably an organic solvent are charged and stirred, the polyisocyanate (Y) and further a chain extender (Z) are added. Examples thereof include a method of reacting at 50 to 100 ° C. for 3 to 10 hours. After the polyurethane resin is produced, an alcohol such as ethanol, methanol, or butanol may be added for the purpose of deactivating the remaining isocyanate groups.
• an alcohol such as ethanol, methanol, or butanol may be added for the purpose of deactivating the remaining isocyanate groups.
• organic solvent examples include ketone solvents such as N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, methyl ethyl ketone, methyl-n-propyl ketone, acetone, and methyl isobutyl ketone; Ester solvents such as methyl, ethyl formate, propyl formate, methyl acetate, ethyl acetate, isopropyl acetate, isobutyl acetate, isobutyl acetate and sec-butyl acetate; alcohol solvents such as methanol, ethanol, isopropyl alcohol and butanol can be used.
• ketone solvents such as N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, methyl ethyl ketone, methyl-n-propyl ketone, acetone, and methyl
• organic solvents may be used alone or in combination of two or more.
• the amount used in the case of using the organic solvent is preferably in the range of 30 to 90% by mass in the polyurethane resin composition, for example, from the viewpoint of production stability, coating property, and film forming property. A range of ⁇ 80 mass% is more preferred.
• the weight average molecular weight of the polyurethane resin (W) obtained by the above method is in the range of 5,000 to 500,000 from the standpoint of further improving chemical resistance and film formability. The range of 10,000 to 300,000 is more preferable.
• the weight average molecular weight of the polyurethane resin (W) is a value measured in the same manner as the number average molecular weight of the polycarbonate polyol (x-1).
• the content of the alicyclic structure in the polyurethane resin (W) is preferably in the range of 4,500 to 7,000 mol / kg from the standpoint that even better chemical resistance is obtained. A range of ⁇ 6,000 mol / kg is more preferred.
• content of the said alicyclic structure is content of the alicyclic structure with respect to the total mass of the said polyol (X), aliphatic or alicyclic polyisocyanate (Y) used for a raw material, and the said chain extender (Z). Show.
• the urethane bond content in the polyurethane resin (W) is preferably in the range of 500 to 900 mol / kg, more preferably in the range of 700 to 800 mol / kg, from the viewpoint of obtaining even better chemical resistance. More preferred.
• content of the said urethane bond shows content of the urethane bond with respect to the total mass of the said polyol (X) used for a raw material, aliphatic or alicyclic polyisocyanate (Y), and the said chain extender (Z).
• the polyurethane resin composition used in the present invention contains the polyurethane resin (W) as an essential component, but may contain other additives as necessary.
• additives examples include surfactants, pigments, catalysts, flame retardants, plasticizers, softeners, stabilizers, waxes, antifoaming agents, dispersants, penetrants, fillers, antifungal agents, and antibacterial agents.
• UV absorbers, antioxidants, weathering stabilizers, fluorescent brighteners, anti-aging agents, thickeners, and the like can be used. These additives may be used alone or in combination of two or more.
• the adhesive layer (ii) can be formed by a known method using a known material.
• a solvent-based urethane resin, a water-based urethane resin, a solvent-free urethane resin, a silicone resin, a polypropylene resin, a polyester resin, or the like is used. be able to.
• a polyol (A) containing 70% by mass or more of a polycarbonate polyol (a-1), an aliphatic or an aliphatic resin is used from the viewpoint of obtaining even more excellent chemical resistance among those described above.
• a polyurethane resin composition comprising a cyclic polyisocyanate (B) and a polyurethane resin (D-1) having a hydroxyl group, which is a reaction product of a chain extender (C), and a crosslinking agent (D-2) It is preferable to use one.
• the polyol (A), aliphatic or alicyclic polyisocyanate (B), and chain extender (C) used as raw materials for the polyurethane resin (D-1) are used for forming the intermediate layer (iii).
• the same raw material as the polyurethane resin (W) can be used.
• the polyurethane resin (D-1) for example, the polyol (A), and preferably an organic solvent are charged and stirred, and then the polyisocyanate (B) and a chain extender (C) are added. Examples thereof include a method of reacting at 50 to 100 ° C. for 3 to 10 hours.
• the molar ratio of the total of the hydroxyl group and amino group which the said polyol (A) and the said chain extender (C) have, and the isocyanate group which the said polyisocyanate (B) has at the time of performing this urethanation reaction is in the range of 0.4 to 0.9 from the viewpoint that it exhibits good crosslinking with the crosslinking agent (X-2) described later, and further excellent adhesion and chemical resistance can be obtained.
• the range of 0.5 to 0.8 is more preferable.
• the weight average molecular weight of the polyurethane resin (D-1) obtained by the above method is 2,000 to 300,000 from the standpoint of obtaining more excellent chemical resistance, film formability, and adhesiveness.
• the range is preferable, and the range of 5,000 to 30,000 is more preferable.
• the weight average molecular weight of the polyurethane resin (D-1) is a value measured in the same manner as the number average molecular weight of the polycarbonate polyol (x-1).
• the urethane bond content in the polyurethane resin (D-1) is preferably in the range of 500 to 900 ⁇ mol / g, and more preferably in the range of 750 to 850 ⁇ mol / g from the viewpoint of obtaining even better chemical resistance. A range is more preferred.
• content of the said urethane bond shows content of the urethane bond with respect to the total mass of the said polyol (A) used for a raw material, aliphatic or alicyclic polyisocyanate (B), and the said chain extender (C).
• crosslinking agent (D-2) for example, a polyisocyanate crosslinking agent, a melamine crosslinking agent, or the like can be used. These crosslinking agents may be used alone or in combination of two or more. Among these, it is preferable to use a polyisocyanate crosslinking agent from the viewpoint of exhibiting good crosslinking with the polyurethane resin (D-1) and obtaining further excellent adhesion and chemical resistance.
• polyisocyanate crosslinking agent examples include polyisocyanates such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate; and these trimethylolpropanes.
• polyisocyanates such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate; and these trimethylolpropanes.
• the content of the cross-linking agent (D-2) is such that the polyurethane resin (D-1) can form a good cross-link, and more excellent adhesion and chemical resistance can be obtained. It is preferably in the range of 0.1 to 40 parts by weight, more preferably in the range of 0.2 to 20 parts by weight with respect to 100 parts by weight of the solid content of (D-1).
• the polyurethane resin composition contains the polyurethane resin (D-1) and a crosslinking agent (D-2), and if necessary, other additives that can be used for the intermediate layer (iii). You may contain.
• Examples of the base fabric (i) include polyester fiber, polyethylene fiber, nylon fiber, acrylic fiber, polyurethane fiber, acetate fiber, rayon fiber, polylactic acid fiber, cotton, hemp, silk, wool, glass fiber, carbon fiber, Nonwoven fabrics, woven fabrics, knitted fabrics and the like made of these blended fibers can be used.
• the synthetic leather of the present invention for example, after forming a skin layer (iv) on a release-treated substrate by a known method, the polyurethane resin is formed on the skin layer (iv). After the composition is applied and dried, an intermediate layer (iii) is obtained, and then an adhesive layer (ii) is formed on the intermediate layer (iii) by a known method, and the adhesive layer (ii) ) And the base fabric (i).
• Examples of the coating method of the resin composition when forming the layers (ii) to (iv) include a method using a gravure coater, knife coater, pipe coater, comma coater, roll coater, applicator and the like. .
• the drying after coating the resin composition may be performed, for example, for 1 to 60 minutes using a drier adjusted to 80 to 120 ° C., for example.
• the film thickness after drying of the layers (ii) to (iv) is appropriately determined depending on the intended use, and is, for example, in the range of 0.001 to 10 mm.
• a surface treatment layer (v) may be provided on the skin layer (iv) as necessary.
• the synthetic leather of the present invention has excellent chemical resistance that does not cause deformation or the like even when sunscreen cream (particularly Neutrogena) adheres.
• DMF N, N-dimethylformamide
• H12MDI 4,4′-dicyclohexylmethane diisocyanate
• IPDA isophoronediamine
• PC-2 number average molecular weight
• PET-1 1,6-hexanediol and adipic acid
• Preparation Example 1 Preparation of skin layer compounding liquid 100 parts by mass of a solvent-based urethane resin (“Crisbon NY-331” manufactured by DIC Corporation) and 20 parts by mass of a black pigment (“DILAC L-1770S” manufactured by DIC Corporation) The mixture was stirred at 2,000 rpm for 2 minutes with a mixer, and then defoamed using a vacuum defoamer to obtain a skin layer compounding liquid.
• a solvent-based urethane resin (“Crisbon NY-331” manufactured by DIC Corporation)
• DILAC L-1770S a black pigment
• Example 1 On the release paper ("EK-100D” manufactured by Lintec Co., Ltd.), after applying the skin layer mixture liquid obtained in Preparation Example 1 with a knife coater (application thickness 150 ⁇ m), using a hot air dryer The skin layer was obtained by drying at 70 ° C. for 2 minutes and then at 120 ° C. for 2 minutes. Further, the intermediate layer polyurethane resin (W-1) composition obtained in Synthesis Example 1 was applied onto this skin layer using a knife coater (application thickness 150 ⁇ m), and then a hot air dryer was used. And dried at 70 ° C. for 2 minutes and then at 120 ° C. for 2 minutes.
• a knife coater application thickness 150 ⁇ m
• DMF N, N-dimethylformamide
• IPDI isophorone diisocyanate
• octylic acid The organic solvent solution of the urethane prepolymer which has an isocyanate group was obtained by adding 0.2 mass part of stannous and making it react at 75 degreeC. Next, 636 parts by mass of DMF was added thereto, cooled to 40 ° C., 10 parts by mass of isophoronediamine (hereinafter abbreviated as “IPDA”) was added, and the polyurethane resin was chain-extended by mixing and stirring. .
• IPDA isophoronediamine
• polyurethane resin (X-1-1) composition 6.0 parts by mass of monoethanolamine was added and mixed to obtain a polyurethane resin (X-1-1) composition.
• the polyurethane resin (D-1-1) composition was mixed with 10% by mass of an HDI adduct to obtain a polyurethane resin composition.
• the organic solvent solution of the urethane prepolymer which has an isocyanate group was obtained by making it react. Next, 638 parts by mass of DMF was added thereto, the mixture was cooled to 40 ° C., 12 parts by mass of 4,4′-dicyclohexylmethanediamine (hereinafter abbreviated as “H12MDA”) was added, and the mixture was stirred to obtain polyurethane. The resin was chain extended. Next, 6.0 parts by mass of monoethanolamine was added and mixed to obtain a polyurethane resin (D-1-3) composition. Immediately before coating to form an adhesive layer, the polyurethane resin (D-1-3) composition was mixed with 10% by mass of an HDI adduct to obtain a polyurethane resin composition.
• H12MDA 4,4′-dicyclohexylmethanediamine
• the organic solvent solution of the urethane prepolymer which has an isocyanate group was obtained by making it react.
• 636 parts by mass of DMF was added thereto, cooled to 40 ° C., 10 parts by mass of IPDA were added, and the polyurethane resin was chain-extended by mixing and stirring.
• 6.0 parts by mass of monoethanolamine was added and mixed to obtain a polyurethane resin (D-1-4) composition.
• the polyurethane resin (D-1-4) composition was mixed with 10% by mass of an HDI adduct to obtain a polyurethane resin composition.
• Example 9 On the release paper ("EK-100D” manufactured by Lintec Co., Ltd.), after applying the skin layer mixture liquid obtained in Preparation Example 1 with a knife coater (application thickness 150 ⁇ m), using a hot air dryer The skin layer was obtained by drying at 70 ° C. for 2 minutes and then at 120 ° C. for 2 minutes. Further, the intermediate layer polyurethane resin (W-1) composition obtained in Synthesis Example 1 was applied onto this skin layer using a knife coater (application thickness 150 ⁇ m), and then a hot air dryer was used. And dried at 70 ° C. for 2 minutes and then at 120 ° C. for 2 minutes.
• a knife coater application thickness 150 ⁇ m
• the number average molecular weights of the polyols and the like used in the synthesis examples and the like are values measured under the following conditions by gel permeation chromatography (GPC) method.
• Measuring device High-speed GPC device (“HLC-8220GPC” manufactured by Tosoh Corporation) Column: The following columns manufactured by Tosoh Corporation were connected in series. "TSKgel G5000" (7.8 mm ID x 30 cm) x 1 "TSKgel G4000” (7.8 mm ID x 30 cm) x 1 "TSKgel G3000” (7.8 mm ID x 30 cm) x 1 “TSKgel G2000” (7.8 mm ID ⁇ 30 cm) ⁇ 1 detector: RI (differential refractometer) Column temperature: 40 ° C Eluent: Tetrahydrofuran (THF) Flow rate: 1.0 mL / min Injection amount: 100 ⁇ L (tetrahydrofuran solution with a sample concentration of 0.4 mass%) Standard sample: A calibration curve was prepared using the following standard polystyrene.
• the synthetic leather of the present invention was found to have excellent chemical resistance.
• Comparative Examples 1 and 2 are embodiments in which the amount of the polycarbonate polyol of the polyurethane resin (X) used for the intermediate layer (iii) is less than the range specified in the present invention, but the chemical resistance was poor. .

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Dispersion Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
• Polyurethanes Or Polyureas (AREA)
• Laminated Bodies (AREA)

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• 2017
  • 2017-10-26 WO PCT/JP2017/038608 patent/WO2018105261A1/ja active Application Filing
  • 2017-10-26 JP JP2018540882A patent/JP6455644B2/ja active Active
  • 2017-11-03 TW TW106138145A patent/TW201829876A/zh unknown

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