JP2007321280A - Flame-retardant napped artificial leather - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flame-retardant napped artificial leather impairing neither surface quality appearance nor feeling, having good color fastness to light, fogging and blotting resistance, and suitably used as interior materials of a rolling stock, an automobile, an aircraft and a ship. <P>SOLUTION: The flame-retardant napped artificial leather comprises a fine fiber of ≤0.5 dtex and an elastic polymer, formed naps of the fine fiber on one surface, formed a flame-retardant layer on the other surface of the nap-formed surface, wherein the flame-retardant layer comprises a flame retardant (A) solid at room temperature, a thermoplastic resin (B) and a low viscosity substance (C) having 500-10,000 cps viscosity at room temperature. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flame-retardant artificial nail-finished leather that is suitably used for vehicles and interior products having good light fastness, fogging, and crease resistance without impairing surface quality and texture.

  Artificial leather has been used for various purposes such as interiors, clothing, shoes, bags, gloves, and vehicle seat upholstery. Among them, in the field used for interior materials of railway vehicles, automobiles, aircrafts and ships, artificial leather having flame retardancy that meets each flame retardancy standard is required.

  Conventionally, artificial leather based on fiber nonwoven fabric, especially napped-toned artificial leather based on ultra-fine fiber nonwoven fabric, has flame retardancy and the artificial leather's sensitivity (surface quality, touch and texture) And physical properties (light fastness including light fastness, fogging, abrasion resistance, etc.) are technical issues, and various flame retardant methods have been proposed.

  A method is disclosed in which a water-soluble flame retardant is made into an aqueous solution having a specific concentration and coated on the back surface of artificial leather (see Patent Document 1). In this method, the texture of the artificial leather is easily hardened. Further, since the elongation is easily fixed, it is difficult to follow the complicated shape of the sheet. Moreover, there is a concern that the flame retardant is wrinkled because it is water-soluble. Further, a method of mixing a flame retardant with impregnated polyurethane is disclosed (for example, see Patent Document 2). With this method, there is a possibility that the performance as a polyurethane resin may be lowered, and it is difficult to improve the polyurethane resin to a level that can withstand vehicle use that requires particularly severe light resistance. In addition, a technique is disclosed in which a phosphazene compound having a high phosphorus content is absorbed in a dyeing bath (see, for example, Patent Document 3). This technology is prone to contamination in the dyeing machine. Under continuous multi-batch processing, contamination during dyeing of other artificial leather due to contamination in the dyeing machine due to flame retardants dropped during dyeing and dispersion stabilizers in the flame retardants. It is difficult to avoid frequent defects, and it is necessary to clean the inside of the dyeing machine sufficiently. In addition, a special cleaning agent is required to remove contamination inside the dyeing machine, and in some cases, disassembly and cleaning of the dyeing machine is also required. It takes a lot of man-hours to switch between. Furthermore, an artificial leather is disclosed in which an ultrafine fiber nonwoven fabric made of phosphoric acid copolymer polyester is filled with a polymer elastic body containing aluminum hydroxide (see Patent Document 4). However, the copolymerized polyester is generally inferior to the regular polyester in terms of light resistance and friction resistance, and becomes a big handicap in the development of a vehicle seat that requires high light resistance and high friction strength. In addition, a technique that overcomes elution of a flame retardant during dyeing and deterioration of yarn physical properties by copolymerizing a phosphorus-based flame retardant with a thermoplastic synthetic fiber is also disclosed (see Patent Document 5). This method may limit the amount of phosphorus copolymerization due to cost problems. As mentioned above, the methods of flame retardant artificial leather proposed so far are to ensure the flame retardant performance and the sensitivity of artificial leather (particularly the surface quality, touch and texture of napped artificial leather) and physical properties. It was insufficient from the viewpoint of coexistence (fastness of dyeing including light resistance, fogging, crease resistance, wear resistance, etc.).

Japanese Patent Publication No. 3-80914 Japanese Patent Laid-Open No. 7-18484 JP 2002-105881 A JP 2002-115183 A JP 2004-169197 A

  As mentioned above, ensuring flame retardancy and the sensitivity of artificial leather (especially the surface quality, touch and texture of brushed artificial leather) and physical properties (fastness of dyeing including light resistance, fogging, wrinkle resistance and There is a problem such as compatibility of wear resistance.

The inventors of the present invention have a flame retardancy that is suitably used and has flame retardancy that complies with each flame retardance standard of interior materials (including vehicle seat overlays) of railway vehicles, automobiles, aircraft, and ships. As a result of diligent studies in obtaining the artificial leather, the present invention has been achieved. That is, the present invention is composed of ultrafine fibers of 0.5 dtex or less and an elastic polymer, and napped by the ultrafine fibers is formed on one surface, and a flame retardant layer is formed on a surface different from the surface on which the napped is formed. In the flame-retardant artificial napped-tone artificial leather, the flame retardant layer comprises a flame retardant (A) that is solid at room temperature, a thermoplastic resin (B), and a low viscosity material having a viscosity of 500 to 10,000 cps at room temperature ( It is a flame-retardant napped artificial leather characterized by containing C).
And the surface in which the nap was formed differs from the water dispersion or aqueous solution which mixed the flame retardant (A), the thermoplastic resin (B), and the low viscosity substance (C) whose viscosity is 500-10000 cps at normal temperature. It is the manufacturing method of the flame-retardant napping artificial leather characterized by apply | coating to a surface and forming a flame-resistant layer.

  The flame-retardant napped-tone artificial leather of the present invention is a flame-retardant napped-toned artificial leather that does not impair the quality and texture of the surface, and has good light fastness, fogging, and crease resistance, It is a flame retardant napped artificial leather that is suitably used for interior materials including a veneer for vehicle, automobile, aircraft and ship seats.

The ultrafine fiber used in the present invention is not particularly limited, but it is important to use an ultrafine fiber of 0.5 decitex or less from the viewpoint that a natural leather-like texture can be obtained when it is a napped artificial leather. The ultrafine fiber may be an ultrafine fiber obtained by direct spinning using a single component, or may be an ultrafine fiber obtained from an ultrafine fiber generating composite fiber composed of at least two types of polymers. The ultrafine fiber generation type composite fiber is, for example, an extraction type composite fiber represented by a sea-island type composite fiber in which a remaining island component is fibrillated by dissolving or decomposing a sea component, or a mechanical / physical method. And split-type composite fibers that are fibrillated into ultrafine fibers made of each polymer by a chemical method using a treatment agent or the like. After spinning, the ultra-fine fiber generation type composite fiber is subjected to processing steps such as drawing, heat treatment, mechanical crimping, cutting, etc. as necessary, and is converted to a short fiber having a fineness of 1 to 15 dtex, and then a known method such as a card method. A non-woven fabric is formed by a method, or a non-woven fabric is made into a non-woven fabric as a long fiber by a known method such as a spunbond method without excessive mechanical stretching after spinning.
Polymers constituting ultrafine fibers can be melt-spun of melt-spinnable polyamides such as 6-nylon, 66-nylon, 12-nylon, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, or copolymers thereof. At least one polymer selected from various polyesters is used. In addition, the component extracted or decomposed and removed by the extractable composite fiber is a polymer having a different solubility or decomposability with respect to the ultrafine fiber component and the solvent or decomposing agent, and having a low compatibility with the ultrafine fiber component, and spinning conditions. Under the present invention, it is necessary that the polymer has a lower melt viscosity or a lower surface tension than the ultrafine fiber component, but in the present invention, it can be dissolved in hot-melt hot water if comprehensive consideration is given to environmental pollution, shrinkage characteristics during dissolution, etc. It is more preferable to use polyvinyl alcohol. Further, the above ultrafine fibers may be colored at the time of spinning by adding inorganic pigments and organic pigments typified by carbon black, titanium oxide, etc., as long as the effects of the present invention are not impaired, or known fiber additives. It is possible to add.

For example, the production of a nonwoven fabric composed of the above-mentioned ultrafine fibers or ultrafine fiber-generating fibers is made by, for example, defibrating with a card if short fibers and forming a web through a webber, and spinning by a spunbond method or the like if long fibers. At the same time, a web is formed, the obtained web is laminated to a desired weight and thickness, and then temporary entanglement treatment is performed by a known method such as needle punching or high-speed water flow as necessary. The basis weight of the web is set according to the basis weight of the target raised artificial leather, but is preferably in the range of 80 to 2000 g / m ² , more preferably in the range of 100 to 1500 g / m ² . In addition, in the case of the use as an upholstery material for a vehicle seat, it is also preferable to insert a woven or knitted fabric into the nonwoven fabric in order to ensure bagging properties. In this case, the knitted or knitted fabric is not particularly limited, and a known woven or knitted fabric can be used within the range allowed by the cost if the purpose can be achieved.

The nonwoven fabric can be further entangled from the viewpoint of improving mechanical strength. In this case, the entanglement method can be a known method such as needle punching or high-speed water flow as in the case of temporary entanglement. The number of punches at the time of needle punching is preferably in the range of 300 to 4000 punches / cm ² , more preferably in the range of 500 to 3500 punches / cm ² . If it is less than 300 punches / cm ² , the fibers are not sufficiently entangled. If it exceeds 4000 punches / cm ² , damage to the fibers constituting the nonwoven fabric will be conspicuous. It may decrease. The needle piercing depth in the needle punching treatment is deepened in the initial stage of the needle punch to increase the entanglement effect and the final process is shallower from the viewpoint of the surface abrasion resistance and fluff quality of the final raised artificial leather. Set so that the needle hole does not stand out.

  It is important to impart an elastic polymer to the inside of the obtained nonwoven fabric in terms of natural leather-like texture, fullness and mechanical properties. As the elastic polymer to be used, any known resin used for impregnation of artificial leather such as polyurethane and acrylic resin can be used. Of these, polyurethane resins are preferred in terms of texture and physical properties. The polyurethane resin was selected from at least one polymer diol selected from polyester diol, polyether diol, polyester ether diol, polylactone diol, polycarbonate diol and the like having an average molecular weight of 700 to 3000, aromatic diisocyanate or alicyclic diisocyanate. Solution polymerization method comprising at least one organic diisocyanate as the main component, another organic diisocyanate or organic triisocyanate, and a compound having two active hydrogen atoms such as low molecular diol, low molecular diamine, hydrazine, and hydroxyamine, if necessary Preferred examples include polyester ether polyurethanes, polylactone polyurethanes, and polycarbonate polyurethanes obtained by polymerization by melt polymerization, bulk polymerization, etc. It is. There are no particular restrictions on the method of applying the polyurethane, and the nonwoven fabric is dipped and niped in a polyurethane solution or dispersion, or the polyurethane solution or dispersion is applied onto the nonwoven fabric and slid into the nonwoven fabric with a roll that rotates at high speed. Methods and the like. Examples of the coagulation method of polyurethane include a method of dipping in a liquid containing a non-solvent of polyurethane and wet coagulating, or a method of gelling and then heat drying to dry coagulate.

  In the polyurethane solution or dispersion, additives such as a colorant such as carbon black and a pigment, a coagulation regulator, an antioxidant, and a dispersant can be blended as necessary. The proportion of polyurethane in the fiber base is 5 to 50 in terms of mass ratio as a solid content with respect to the fibers constituting the non-woven fabric before being made into ultrafine fibers in order to give the artificial leather a soft texture and elastic recovery. %, Preferably 10 to 40%. When the polyurethane ratio is less than 5%, it is difficult to form a dense elastic sponge (porous structure) and it is difficult to obtain a soft texture. When the polyurethane ratio exceeds 50%, the texture becomes rubber-like, so that it tends to be unfavorable as a material in the intended purpose of the present invention.

When an ultrafine fiber generation type composite fiber is used as the fiber constituting the nonwoven fabric, the composite fiber is composed of at least one component (preferably a sea component component polymer) of the fiber component polymer with a solubilizer or decomposition agent. It is modified into ultrafine fibers or ultrafine fiber bundles by treatment or mechanical or chemical treatment. The modification treatment of the ultrafine fiber generating fiber may be performed before the polymer elastic body is applied. However, if the polymer elastic body is applied to the ultrafine fiber bundle after modification, the polymer elastic body adheres to the ultrafine fiber and the texture is hard. Therefore, it is preferable that the polymer is modified into an ultrafine fiber bundle after applying the polymer elastic body. When the modification treatment is performed before the polymer elastic body is applied, the polymer elastic body is applied after a temporary filler that can be dissolved and removed such as polyvinyl alcohol is applied to the nonwoven fabric so that the ultrafine fibers and the polymer elastic body do not adhere to each other. Thereafter, it is preferable to remove the temporary filler. Basis weight of the resulting sheet is preferably ^{300g / m 2 ~1500g / m 2} , 400~1000g / m 2 is more preferable. When it is less than 300 g / m ² , the napped-tone artificial leather obtained has low tear strength and tensile strength, and lacks practical strength. When it exceeds 1500 g / m ² , wrinkles are likely to occur on the surface and the quality tends to be poor. The thickness is preferably in the range of 0.3 mm to 4 mm, and more preferably 0.5 mm to 3.0 mm. When the thickness is less than 0.5 mm, the obtained napped-tone artificial leather has low tear strength and tensile strength, and lacks practical strength. When it exceeds 4 mm, the surface is likely to be wrinkled and inferior in quality.

  In addition, for the purpose of improving and adjusting the mechanical properties including the texture and sense of fullness of the artificial leather, and the surface abrasion resistance, any stage after modification to the ultrafine fiber bundle, that is, after the ultrafine treatment, It is also preferable to apply a small amount of the polymer elastic body to the surface where the nap is formed or the surface where the nap is formed in a state of a solution or a dispersion after the napping treatment and after the dyeing treatment. However, since the polymer elastic body applied at these stages adheres to the ultrafine fibers as described above, the desired texture and physical properties are within a range of about 10% or less in terms of solid content with respect to the basis weight of the ultrafine fibers. In addition to the above, it is added additionally.

After the sheet obtained above is adjusted to a desired thickness by slicing, buffing, etc., one side of the sheet is buffed by a known method such as sandpaper or a needle cloth, the ultrafine fibers are raised, and if necessary By post-processing such as dyeing, artificial leather with the desired appearance and texture is obtained.
The thickness of the obtained napped-tone artificial leather varies depending on the purpose of use, but when used as an upholstery material for a vehicle seat, the thickness is preferably 0.4 to 3.0 mm, and the apparent density is full and drape. It is preferable that it is 0.1-0.8 g / cm < ³ > at the point which brings a property and the outstanding mechanical property.

  The flame retardant treatment of the present invention comprises a flame retardant (A) (hereinafter sometimes simply referred to as a flame retardant (A)), a thermoplastic resin (B ) And a low-viscosity substance (C) having a viscosity of 500 to 10000 cps at room temperature.

  Here, the flame retardant (A) is solid at room temperature and is not particularly limited as long as it is water-insoluble or water-insoluble, but it has been dehalogenated from the viewpoint of conforming to recent environmental hormone regulations. Is preferably used. Examples of the dehalogenated flame retardant include phosphorus-containing compounds, nitrogen-containing compounds, phosphorus nitrogen compounds, sulfoamide compounds, phosphorus sulfoamide compounds, sulfur-containing nitrogen compounds, and the like. Can be used. From the viewpoint of flame retardancy, the flame retardant (A) is preferably a phosphorus compound. Examples of the phosphorus compound include guanidine phosphate, phosphate carbamate, phosphate ester, phosphate ester amide, and ammonium polyphosphate. In particular, an ammonium polyphosphate flame retardant having a high phosphorus content is preferable, and a type coated with a melamine resin or a silicon oxide-based resin is further preferable in order to make it hardly water soluble. The amount of flame retardant (A) attached must be determined from the standpoint of ensuring the necessary flame retardant performance and reducing the texture hardening. The weight of the napped artificial leather, the thickness, the ultrafine fiber, and the polymer type of the elastic polymer Although it increases or decreases depending on the ratio, it is generally preferable to contain 5 to 20% by mass with respect to the napped artificial leather in terms of achieving both flame retardancy and texture.

  The thermoplastic resin (B) is added to serve as a binder in order to prevent the flame retardant from falling off when applied and dried, and is water-based in that it tends to adhere discontinuously in terms of texture and physical properties. Preference is given to using polyurethane emulsions. The thermoplastic resin (B) is preferably mixed in an amount of 5 to 100% by mass and more preferably 10 to 50% by mass with respect to the flame retardant (A). When the amount is less than 5% by mass, the flame retardant is likely to drop off, and when the amount exceeds 100% by mass, it is difficult to ensure flame retardancy.

  The low-viscosity substance (C) having a viscosity of 500 to 10,000 cps at normal temperature (hereinafter sometimes simply referred to as low-viscosity substance (C)) is used for the purpose of preventing texture hardening. In other words, the combination of the flame retardant (A) and the thermoplastic resin (B) that are solid at room temperature inevitably causes a texture hardening when applied to a napped artificial leather and a decrease in the balance of the texture, but it is liquid at room temperature. By adding the low-viscosity substance (C), the low-viscosity substance (C) acts as a plasticizer, and it is possible to greatly suppress the texture hardening when applied to the back surface. For that purpose, the low-viscosity substance (C) needs to be in a liquid state at room temperature, and is not particularly limited as long as it exhibits low-viscosity in the range of 500 to 10,000 cps. Since the coating amount can be reduced, the low viscosity substance (C) is preferably a flame retardant. In the case of a flame retardant, it is preferable to use a phosphorus flame retardant similarly to the flame retardant (A), and a phosphate ester flame retardant, a phosphate ester amide flame retardant and the like can be selected. Furthermore, when using it for the use of the upper material of a vehicle seat, it is preferable that the low viscosity substance (C) is non-volatile in consideration of fogging. The low viscosity substance (C) is preferably mixed in an amount of 0.2 to 20% by mass, more preferably 0.5 to 10% by mass, based on the flame retardant (A). If it is less than 0.2% by mass, the effect of the plasticizer is reduced and the prevention of texture hardening is weakened. If it exceeds 20% by mass, the low-viscosity substance (C) itself will be transferred to the surface and the surface quality of the napped artificial leather will be impaired, and it will tend to cause wrinkles. In addition, normal temperature said by this invention means the range of 5 to 30 degreeC, and it is preferable that the viscosity of a low-viscosity substance is especially the viscosity of the said range at 20 degreeC, and a flame retardant (A) at 20 degreeC. Is preferably a solid. The viscosity measuring method is not particularly limited, but a generally used rotational viscometer measuring method is used.

Application of the flame retardant (A), thermoplastic resin (B) and low viscosity substance (C) to the back surface of the raised artificial leather may be performed by coating the mixed solution as it is, but from the viewpoint of preventing texture hardening. Therefore, it is preferable to apply the liquid mixture by foaming. In this case, the foaming method is not limited to mechanical foaming or chemical foaming, but in the case of mechanical foaming, adding 1 to 3% by weight of a surfactant as a foaming agent to the above-mentioned mixed liquid adjusts the foaming ratio. From the point of being excellent in the texture of the obtained flame-retardant napped artificial leather.
As a coating method, a known coating method can be used, but a screen coating method is preferable because the amount of foaming liquid attached can be controlled relatively accurately.

  The drying method after applying the flame retardant can be performed by a known method using a known dryer such as a tenter dryer.

  Embodiments of the present invention will be described below with reference to examples, but the present invention is not limited to these examples. In addition, the description regarding the amounts and ratios of parts,%, etc. in the examples is all about mass unless otherwise specified. Moreover, the measurement with combustibility, fogging, and wrinkles was performed according to the measurement method shown below.

<Flammability measurement>
Test method: Test method for fabric material for sheet skin (JASO M 403-88 6.20 Established by the Society of Automotive Engineers of Japan)
Take five test pieces each having a width of 100 mm and a length of 356 mm from the vertical and horizontal directions, and attach a first marked line at a position 38 mm from the end and a second marked line at a position 254 mm from the first marked line, Hold the U-shaped clamp with the surface facing down. An indirect flame is burned at the end of the first marked line for 15 seconds with a burner with a predetermined calorific value, the time from when the flame reaches the first marked line until it reaches the second marked line is measured, calculate.
Combustion rate (mm / min) = 60 × D / T
D: Combustion distance (mm), T: Time required to burn Dmm (s)
Fire extinguishing in front of the marked line ... Exceeding the self-extinguishing marked line before the marked line, extinguishing in 60 seconds and within a combustion distance of 50 mm ... Self-extinguishing burning speed 100 mm / min or less ... Above ... flammability

<Fogging measurement>
Test method: Test method for fabric material for sheet skin (JASO M 403-88 6.22 Automobile Technical Association established)
Put a 70mm diameter circular test piece into the beaker of the haze tester with the back side up, cover the transparent glass plate, heat in an oil bath at 100 ° C for 5 hours, and integrate the fog on the glass plate after heating. Using a spherical light transmittance measuring device (specified in JIS K6714), the calculation is performed according to the following equation.
Haze value (%) = (T4 / T2-T3 / T1) × 100
T1: incident light amount, T2: total light transmission amount, T3: light amount scattered by the apparatus,
T4: Amount of light scattered by the device and glass plate

<Measure with wrinkles>
A test piece cut in a 20 cm square is placed on a horizontal base, and 10 ml of water is dropped onto the center of the test piece. Let it dry at room temperature as it is, and observe the state of the surface stain.

[Manufacture of napped artificial leather]
Sea-island composite fiber staples with island component polyethylene terephthalate and sea component low density polyethylene (20 islands, polyethylene terephthalate: low density polyethylene = 60: 40, fineness 4.0 decitex, fiber length 51 mm, crimp number 12 mountains / inch), a web is produced through the steps of a card and a cross wrapper, a needle punch of 40 P / cm ² is performed as a temporary entanglement process, and a nonwoven fabric made of ultrafine fiber generating fibers with a basis weight of 400 g / m ² Got. Using a single barb felt needle, the nonwoven fabric was needle punched with a punch number of 1400 P / cm ² to obtain a nonwoven fabric with a basis weight of 370 g / m ² . The obtained non-woven fabric was impregnated with a 15% DMF solution of polyether polyurethane, and this was immersed in a mixed liquid bath of dimethylformamide (hereinafter sometimes abbreviated as DMF) and water to wet-solidify the polyurethane, Further, the remaining DMF is washed away with water, and then the polyethylene as a sea component is extracted and removed in a 85 ° C. toluene bath. Thus, a base for artificial leather having a basis weight of 295 g / m ² and a thickness of 0.8 mm was obtained.

  One side of the obtained substrate was buffed twice with No. 180 sandpaper to make the thickness 0.7 mm while smoothing the surface, then the opposite side was twice with No. 240 sandpaper and No. 400 sand. Buffing was performed twice with paper to make a raised surface made of polyethylene terephthalate ultrafine fibers, and a suede-like artificial leather before dyeing was obtained.

  Next, this suede-like artificial leather is immersed in a hot water bath at 80 ° C., left for 20 minutes, allowed to adjust to hot water and relaxed at the same time, using a high-pressure liquid dyeing machine, bath ratio 1: 15, dyed with disperse dye and dried to obtain a dyed suede-like artificial leather. The obtained suede-like artificial leather had a high-quality fluffy feel, a touch and a soft texture.

Ammonium polyphosphate flame retardant aqueous dispersion with a solid content of 40% coated with a silicon oxide resin on the surface opposite to the surface on which the napped surface of the napped artificial leather obtained above is formed (Nikka Chemical Co., Ltd.) Nikkafinon HF-36D flame retardant is 100 parts in a solid state at 20 ° C., 50 parts of an aqueous polyurethane emulsion having a solid content of 40% (Evafunal HA-107C manufactured by Nikka Chemical Co., Ltd.) and an aqueous phosphate ester flame retardant solution Nikkafinon HF-53 made by Hua Chemical Co., Ltd. The viscosity of the flame retardant is 2000 to 5000 cps at 20 ° C). A screen coating using a 1140 μm mesh roll was applied at a coating amount of 90 g / m ² and dried at 140 ° C. for 2 minutes and 30 seconds to obtain a flame-retardant napped artificial leather. The obtained flame-retardant napping artificial leather reproduces the surface feeling before flame retardant treatment, and the texture is slightly inferior to that of untreated, but there is no feeling of bending and it can be used as a seat skin material sufficiently Met. The flammability was self-extinguishing, the fogging value was 7%, and the wrinkle level was at a level with no particular problem.

Comparative Example 1
A flame retardant raised artificial leather was obtained by applying a flame retardant on the back surface in the same manner as in Example 1 except that the phosphoric ester-based flame retardant aqueous solution was not blended. Although the obtained flame-retardant artificial nail-finished leather reproduced the surface feeling before the flame-retardant treatment, the texture was significantly roughened compared to the untreated one and could not be used for the sheet skin material. The flammability was self-extinguishing, the fogging value was 4%, and the wrinkle level was at a level with no particular problem.

Comparative Example 2
Example 1 A mixed solution of 40 parts of a phosphoric ester flame retardant (Nikka Finenon HF-53 manufactured by Nikka Chemical Co., Ltd.) and 50 parts of an aqueous polyurethane emulsion having a solid content of 40% (Evafunal HA-107C manufactured by Nikka Chemical Co., Ltd.) In the same manner as above, it was applied to the back surface of the napped-tone artificial leather to obtain a flame-retardant napped-artificial leather. The resulting flame-retardant artificial napped-tone artificial leather reproduces the surface feeling before the flame retardant treatment, and the texture is almost as flexible as the untreated one, but the flammability is flammable. Yes, the fogging value was 20%, and when it was wrinkled, a white stain could be visually confirmed.

The flame-retardant napped-tone artificial leather of the present invention is a flame-retardant napped-artificial leather that does not impair the quality and texture of the surface, and has good light fastness, fogging, and crease resistance. It is a flame-retardant napped artificial leather that is suitably used for aircraft and marine interior materials.

Claims (8)

A flame retardant napping comprising an ultrafine fiber of 0.5 decitex or less and an elastic polymer, and napped by the ultrafine fiber is formed on one surface, and a flame retardant layer is formed on a surface different from the surface on which the napped is formed In the artificial leather, the flame retardant layer contains a flame retardant (A) that is solid at room temperature, a thermoplastic resin (B), and a low viscosity substance (C) that has a viscosity of 500 to 10,000 cps at room temperature. Characterized by flame retardant artificial leather. The flame-retardant napped artificial leather according to claim 1, wherein the low-viscosity substance (C) having a viscosity of 500 to 10,000 cps at room temperature is a flame retardant containing a phosphorus atom. The flame retardant napped artificial leather according to claim 1 or 2, wherein the thermoplastic resin (B) comprises an aqueous polyurethane emulsion. The flame retardant napping artificial leather according to any one of claims 1 to 3, wherein the flame retardant (A) is contained in an amount of 5 to 20 mass% with respect to the napped artificial leather. The flame retardant napped artificial leather according to any one of claims 1 to 4, wherein the thermoplastic resin (B) is 5 to 100 mass% with respect to the flame retardant (A). The flame retardancy according to any one of claims 1 to 5, wherein the low-viscosity substance (C) having a viscosity of 500 to 10,000 cps at room temperature is 0.2 to 20% by mass relative to the flame retardant (A). Napped artificial leather. An upholstery material for a vehicle seat, comprising the flame retardant artificial artificial leather according to any one of claims 1 to 6. An aqueous dispersion or aqueous solution in which a flame retardant (A), a thermoplastic resin (B), and a low-viscosity substance (C) having a viscosity of 500 to 10000 cps at room temperature is mixed on a surface different from the surface on which napping is formed. A method for producing a flame-retardant napped artificial leather, which is coated to form a flame-retardant layer.