JPH07292399A - Split leather - Google Patents

Abstract

PURPOSE:To provide a split leather developing whitened tone similar to a natural leather with grain and having excellent embossing processability. CONSTITUTION:This split leather is produced by foaming a urethane-based resin skin layer containing 100 pts.wt. of a urethane-based resin and 10-70 pts.wt. of a long-chain fatty acid non-alkali metal salt on the surface of a base leather. The long-chain fatty acid non-alkali metal salt is a salt derived from one or more kinds of fatty acids selected from lauric acid, palmitic acid, stearic acid, oleic acid, linolic acid and linolenic acid and one or more kinds of metals selected from lead, zinc, cadmium, barium, magnesium, calcium, aluminum, lithium and strontium. The particle diameter of the salt is preferably 3-50mum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called split leather in which a surface layer of urethane resin is provided on the surface of a floor leather excluding a silver surface portion from natural leather, more specifically, a natural leather with a silver surface. It has a very similar appearance and texture, and also has a so-called whitening tone coloring property in which, when bent, the hue of the bent portion becomes whitish compared to the hues of other portions, like the natural leather with a silver surface. Regarding split leather with excellent pushability.

[0002]

2. Description of the Related Art Conventionally, natural leather having a silver surface has been widely used as a main body of shoes, bags, bags, miscellaneous goods, or accessories by being stamped into various shapes by pressing with heat and pressure. ing. However, a natural leather having a silver surface is expensive because animal resources are limited, and as an alternative, a skin layer made of a urethane-based resin is formed on the surface of a floor leather with the silver surface removed from the natural leather. So-called split leather was sometimes used.

[0003]

The above-mentioned floor leather, which is obtained as a by-product of natural leather with a silver surface, can be obtained at a relatively low cost and is cheaper than natural leather. However, it was impossible to form a sharp pattern by embossing as in the case of natural leather with a silver surface when embossing. Further, the silver-faced natural leather has a property that, when folded, the hue of the bent portion becomes whitish compared to other portions (hereinafter sometimes referred to as “whitening tone coloring”). No conventional split leather has such properties.

The present invention makes use of the excellent properties of the floor leather, which is a natural material that can be obtained in a large amount and is inexpensive, such as the suede-like appearance and moisture absorption and desorption of the back surface, the surface smoothness, and the uniformity of appearance. A split with an excellent texture and a high-quality surface layer that closely resembles the silver surface of natural leather, and has the same whitening coloring as the natural leather with a silver surface and excellent embossing processability. Intended to provide leather.

[0005]

The split leather of the present invention, which has been made to achieve the above object, has 10 parts by weight of a non-alkali metal long-chain fatty acid salt per 100 parts by weight of a urethane resin on the surface of a floor leather. It is characterized by forming a urethane resin skin layer containing up to 70 parts by weight. The non-alkali metal long-chain fatty acid salt, lauric acid, palmitic acid, stearic acid, oleic acid,
At least one fatty acid selected from linoleic acid and linoleic acid, and lead, zinc, cadmium, barium,
Magnesium, calcium, aluminum, lithium,
A compound consisting of one or more metals selected from strontium and having a particle size of 3 to 50 μm can be preferably used.

The present invention will be described below with reference to the drawings.
FIG. 1 is a partially enlarged cross-sectional view showing an embodiment of split leather of the present invention, in which 1 is split leather of the present invention, 2 is floor leather, 3 is a long-chain fatty acid salt of a non-alkali metal. Urethane resin skin layers and 4 are adhesive layers.

The floor leather 2 used in the present invention has a silver surface removed, tanned, buffed, and dyed as necessary, as compared with the natural leather used in conventional split leather. Floor leather can be used.

The urethane resin forming the urethane resin skin layer 3 formed on the surface of the floor leather 2 is a urethane resin conventionally used as a skin layer of split leather, such as a polyester urethane resin. ,
One-pack type or two-pack type (usually one-pack type) urethane such as polyether urethane resin, polycaprolactone urethane resin, polyester / ether copolymer urethane resin, polycarbonate urethane resin, polyamino acid / polyurethane copolymer resin A system resin can be used. Further, as the above urethane-based resin, a copolymer with a synthetic resin other than the above urethane-based resin, a mixture with polyvinyl chloride, synthetic rubber, etc. is used as long as it does not impair the properties of split leather. May be.

In the urethane resin of the present invention, if necessary, an antioxidant, an ultraviolet absorber, a pigment, a dye, a surfactant, an antistatic agent, a flame retardant, an anti-adhesive agent, a tackifier, a filler, Various additives such as a crosslinking agent may be added in an appropriate amount, and collagen powder may be added as necessary.

The non-alkali metal fatty acid salt added to the urethane resin includes at least one fatty acid selected from lauric acid, palmitic acid, stearic acid, oleic acid, linoleic acid, and linoleic acid, and lead, zinc, A compound composed of one or more metals selected from cadmium, barium, magnesium, calcium, aluminum, lithium, and strontium is suitable, but not limited thereto.

Specific examples of the non-alkali metal fatty acid salt include lead laurate, zinc laurate, cadmium laurate, barium laurate, magnesium laurate, calcium laurate, aluminum laurate, lithium laurate, and laurate. strontium,
Lead palmitate, zinc palmitate, cadmium palmitate, barium palmitate, magnesium palmitate, calcium palmitate, aluminum palmitate, lithium palmitate, strontium palmitate, lead stearate, zinc stearate, cadmium stearate, stearic acid. Barium, magnesium stearate, calcium stearate, aluminum stearate, lithium stearate, strontium stearate, lead oleate, zinc oleate, cadmium oleate, barium oleate, magnesium oleate, calcium oleate, aluminum oleate, olein. Lithium acid, strontium oleate,
Lead linoleate, zinc linoleate, cadmium linoleate, barium linoleate, magnesium linoleate, calcium linoleate, aluminum linoleate, strontium linoleate, lead linoleate, zinc linoleate, cadmium linoleate, barium linoleate,
Magnesium linoleate, calcium linoleate,
Examples thereof include aluminum linoleate, lithium linoleate, and strontium linoleate.

The particle size of the long-chain fatty acid metal salt of non-alkali metal is preferably in the range of 3 to 50 μm. If the particle size of the long-chain fatty acid metal salt of a non-alkali metal is too large, coating unevenness may occur during the production of the skin layer, making it difficult to form a uniform urethane-based resin skin layer 3. On the other hand, if the particle size is too small, the workability when blending the urethane resin solution for forming the urethane resin skin layer 3 will be poor, and the whitening tone coloring property will not be fully exhibited and the embossing processability will also deteriorate. There is a risk of

The amount of the long-chain fatty acid metal salt of non-alkali metal added is 100 parts by weight of the urethane resin.
It is 10 to 70 parts by weight, preferably 15 to 65 parts by weight. If the amount of the long-chain fatty acid metal salt of a non-alkali metal added is too large, the strength of the urethane-based resin skin layer 3 may decrease, and if the amount added is too small, the whitening tone coloring property may not be sufficiently exhibited, The embossing workability may also deteriorate.

As shown in FIG. 1, the urethane resin skin layer 3 is laminated on the floor leather 2 with an adhesive layer 5 provided if necessary. The adhesive forming the adhesive layer 5 is not particularly limited as long as it is used in a conventional split leather, but a two-component type urethane resin adhesive is usually used. As the urethane resin used as the adhesive, similar to the urethane resin forming the skin layer, for example, polyester urethane resin, polyether urethane resin, polycaprolactone urethane resin, polyester / ether copolymer urethane resin Polycarbonate-based urethane resin, polyamino acid / polyurethane copolymer resin urethane-based resin, a copolymer of these with a synthetic resin other than urethane-based resin, a mixture of polyvinyl chloride, synthetic rubber and the like can be used. Further, the adhesive layer 5 may be added with various additives as described above, if necessary.

As a method of manufacturing the split leather 1 of the present invention having the above-mentioned layer structure, the same method as the conventional split leather is adopted. For example, a urethane resin containing a long-chain fatty acid salt of a non-alkali metal on the surface of the release paper on which the release pattern is formed by adopting a release paper transfer method and having an uneven pattern resembling a silver surface uneven stop on the surface. The solution is applied by a doctor knife, a comma doctor, a roll coater, a gravure coater, a rotary screen, or other appropriate means and dried to form the urethane resin skin layer 3. Then, a resin solution for forming the adhesive layer 5 (usually a two-component urethane resin solution) is applied onto the skin layer 3 described above,
The floor leather 2 is attached by wet lamination or dry lamination. Further, if necessary, after sending to the aging step to complete the crosslinking reaction of the adhesive layer 5, the release paper with a squeeze pattern is peeled off, and the uneven pattern formed on the surface of the release paper has a urethane resin. The split leather 1 of the present invention having the urethane resin layer 3 transferred to the surface layer 3 and having a surface design similar to that of natural leather is obtained.

The split leather 1 of the present invention is not limited to the one composed of the urethane resin skin layer 3, the floor leather 2 and the adhesive layer 5 as shown in FIG. The intermediate skin layer 4 can be provided between the urethane-based resin skin layers 3.

The above-mentioned inner skin layer 4 is usually the same as the outer skin layer 3, for example, polyester type urethane resin, polyether type urethane resin, polycaprolactone type urethane resin, polyester / ether copolymer type urethane resin, polycarbonate type urethane. Resins, polyamino acid / polyurethane copolymer resins Urethane resins, copolymers of these with synthetic resins other than urethane resins, mixtures of polyvinyl chloride, synthetic rubber, etc. , UV absorbers, pigments, dyes, surfactants,
It is composed of various additives such as an antistatic agent, a flame retardant, an anti-adhesive agent, a tackifier, a filler, a cross-linking agent and a urethane resin to which collagen powder is added.

The inner skin layer 4 may be a single layer or a multi-layer, and when it is a multi-layer, it may have different compositions. Further, the lamination with the skin layer may or may not interpose the adhesive layer 5.
Further, the inner skin layer 4 may be a foam layer or a microporous layer.

[0019]

The split leather of the present invention develops a whitening tone coloring property by incorporating a long-chain fatty acid salt of a non-alkali metal in the surface layer of the polyurethane resin, like the natural leather with a silver surface, and the non-alkali metal. Since the degree of whitening of the split leather surface can be changed according to the amount of the long-chain fatty acid salt added, the surface design can be varied. In addition, the split leather of the present invention,
When the embossing process is performed using heat and pressure, the surface does not become rough, and a sharp pattern can be formed by the embossing process as in the case of natural leather with a silver surface.

[0020]

The present invention will be described in more detail with reference to specific examples, but the present invention is not limited to the examples described below.

[Example 1] A one-pack type polyester system containing 15 parts by weight of zinc stearate (average particle diameter 3 µm) per 100 parts by weight of a polyurethane resin, containing a coloring agent on release paper with a perforated pattern. Polyurethane resin solution (solid content 20%) was applied to 100 g / m ² and applied.
It was dried at 0 ° C. for 3 minutes to form a polyurethane resin skin layer having a dry thickness of 20 μm. On the obtained skin layer,
A two-component polyester polyurethane solution containing no colorant (solid content: 50%) was applied at 130 g / m ² and dried at 90 ° C. for 3 minutes, and then a thickness of 1.5
mm floor leather was laminated. Then, the mixture was left at room temperature for 48 hours to complete the crosslinking reaction, and the release paper was peeled off to obtain a split leather of the present invention. The obtained split leather had excellent surface smoothness, had a uniform appearance, and had a soft texture, and was very similar to natural leather with a silver surface.

Further, when this split leather was bent outward, the hue of the bent portion changed to a whitish color as compared with the hues of the other portions, like a leather with a silver surface. Moreover, the obtained split leather was subjected to embossing with a mold in which a geometric pattern was engraved using a heat press machine (processing conditions: temperature 160 ° C., pressure 8 kg
/ Cm ² , time 4 seconds), the surface was not roughened, and split leather having a geometric pattern sharply embossed on the surface was obtained.

[Example 2] A one-pack polyester containing 30 parts by weight of cadmium laurate (average particle size: 10 µm) per 100 parts by weight of a polyurethane resin, containing a coloring agent on release paper with a perforated pattern. System polyurethane resin solution (solid content 20%) is applied so as to be 110 g / m ² and dried at 110 ° C. for 3 minutes to obtain a dry thickness of 22.
A polyurethane resin skin layer of μm was formed. On the obtained skin layer, a two-component polyester polyurethane solution containing no colorant (solid content 60%) was applied so as to have a concentration of 120 g / m ^2, and immediately after that, a floor leather having a thickness of 1.3 mm was applied. Pasted together Then, the mixture was left standing at room temperature for 48 hours to complete the crosslinking reaction, and the release paper was peeled off to obtain a split leather of the present invention. The obtained split leather had excellent surface smoothness, had a uniform appearance, and had a soft texture, and was very similar to natural leather with a silver surface.

Further, when this split leather was bent to the outside, the hue of the bent portion changed to a whitish color than the hues of the other portions, like natural leather with a silver surface. Further, the obtained split leather was embossed with a mold in which a patchwork pattern was engraved using a heat press machine (processing conditions: temperature 160 ° C., pressure 8 kg / cm ² , time 4 seconds). , Split leather with a smooth surface and a patchwork pattern sharply embossed on the surface was obtained.

Example 3 On a release paper with a leather pattern, a coloring agent was contained, and 100 parts by weight of a polyurethane resin was added.
A one-pack type polyester-based polyurethane resin solution (solid content 20%) containing 40 parts by weight of cadmium stearate (average particle size 10 μm) was applied at 130 g / m ² and dried at 100 ° C. for 3 minutes. And dry thickness 26μ
m polyurethane resin skin layer was formed. A two-pack type polyester polyurethane solution (solid content 50%) containing no colorant was applied onto the obtained skin layer so as to be 130 g / m ² and dried at 90 ° C. for 3 minutes to obtain a thickness. 1.8 mm floor leather was laminated. After this, at room temperature 48
Leave it for a while to finish the crosslinking reaction, peel off the release paper,
The split leather of the present invention was obtained. The obtained split leather had excellent surface smoothness, had a uniform appearance, and had a soft texture, and was very similar to natural leather with a silver surface.

Further, when this split leather was bent to the outside, the hue of the bent portion changed to whiter than the hues of the other portions like natural leather with a silver surface. Further, the obtained split leather was embossed with a mold in which a mesh pattern was engraved using a heat press machine (processing conditions: temperature 160 ° C., pressure 7 k
(g / cm ² , time: 4 seconds), there was no surface roughness, and split leather was obtained in which the mesh pattern was sharply embossed on the surface of split leather.

Example 4 A release paper with a leather pattern containing a coloring agent was added to 100 parts by weight of a polyurethane resin.
A one-pack type polyester-based polyurethane resin solution (solid content 20%) containing 60 parts by weight of zinc laurate (average particle size 10 μm) was applied at 150 g / m ² and applied.
Drying was performed at 0 ° C. for 3.5 minutes to form a polyurethane resin skin layer having a dry thickness of 30 μm. A two-pack type polyester polyurethane solution (solid content 50%) containing no colorant was applied onto the obtained skin layer so as to be 130 g / m ² and dried at 90 ° C. for 3 minutes to obtain a thickness. 1.5
mm floor leather was laminated. Then, the mixture was left standing at room temperature for 48 hours to complete the crosslinking reaction, and the release paper was peeled off to obtain a split leather of the present invention. The split leather obtained had excellent surface smoothness, had a uniform appearance, and was very similar to natural leather with a silver surface.

Further, when this split leather was bent to the outside, the hue of the bent portion changed to a whitish color than the hues of the other portions, like natural leather with a silver surface. Further, the obtained split leather was embossed with a mold in which a floral pattern was engraved using a heat press machine (processing conditions: temperature 160 ° C., pressure 8 kg /
(cm ² , time: 4 seconds), there was no surface roughness, and split leather having a floral pattern sharply embossed on the surface of split leather was obtained.

Comparative Example 1 A split leather was obtained in the same manner as in Example 1 except that zinc stearate was not added to the polyurethane resin solution forming the polyurethane resin skin layer. The obtained split leather was not whitened even when bent, and when it was embossed under the same conditions as in Example 1, the surface roughness was remarkable.

[Comparative Example 2] Polyurethane resin A polyurethane resin solution for forming a skin layer was added with a polyurethane resin 10
Split leather was obtained in the same manner as in Example 1 except that 5 parts by weight of zinc stearate was added to 0 parts by weight. The obtained split leather was slightly whitened when it was bent, but its effect was low, and when it was embossed under the same conditions as in Example 1, rough surface was generated.

Comparative Example 3 Polyurethane Resin A polyurethane resin solution for forming a skin layer was mixed with 10% of polyurethane resin.
Split leather was obtained in the same manner as in Example 1 except that 90 parts by weight of zinc stearate was added to 0 parts by weight. The split leather obtained had a weak skin layer strength and was not suitable for practical use.

[0032]

INDUSTRIAL APPLICABILITY The split leather of the present invention develops a whitening tone coloring property by adding a long-chain fatty acid salt of a non-alkali metal in the surface layer of the polyurethane resin, and therefore has a property close to that of a natural leather with a silver surface. The split leather can be suitably used as a main body of shoes, bags, bags, miscellaneous goods, or accessories. Further, since it is also excellent in embossing workability, it is possible to form a sharp pattern by embossing, as in the case of the natural leather with a silver surface.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view showing an embodiment of a split leather of the present invention.

FIG. 2 is a partially enlarged sectional view showing another embodiment of the split leather of the present invention.

[Explanation of symbols]

 1 Split leather 2 Floor leather 3 Urethane resin skin layer 4 Middle skin layer 5 Adhesive layer

Claims (3)

[Claims] 1. A split characterized in that a surface layer of urethane resin containing 10 to 70 parts by weight of a long-chain fatty acid salt of a non-alkali metal is formed on 100 parts by weight of urethane resin on the surface of floor leather. leather. 2. The non-alkali metal long-chain fatty acid salt is one or more fatty acids selected from lauric acid, palmitic acid, stearic acid, oleic acid, linoleic acid, and linoleic acid, and lead, zinc, cadmium, barium, The split leather according to claim 1, which is a compound comprising at least one metal selected from magnesium, calcium, aluminum, lithium, and strontium. 3. The split leather according to claim 1, wherein the particle size of the long-chain fatty acid salt of non-alkali metal is in the range of 3 to 50 μm.