JPH09308523A - Suede like sheet and manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suede like sheet which is slightly clogged, improved in retentive power of cosmetics and has a uniform suede like surface appearance and also a very thin thickness. SOLUTION: A suede like sheet is made by peeling a wet polyurethane coagulated layer having numberless pores having a pore size of 5-100 microns formed on a substrate while leaving a part of the layer on the substrate accompanied with the layer destruction. The method for manufacturing the suede like sheet comprises applying a polyurethane solution incorporated with 1-60 parts by wt. of particles having a particle diameter of 5-100 microns and being a water- soluble but insoluble in the solvent used for dissolving the polyurethane per 100 parts wt. of the polyurethane, coagulating it in a wet method and releasing the formed wet coagulated film from the substrate while leaving the thin film on the substrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suede-like sheet and a method for producing the same, more specifically, a suede-like sheet made of polyurethane, which is preferably used as a cosmetic puff material, and preferably has a thickness of 150 μ to 600 μ. And a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a suede-like sheet used as a cosmetic puff material, there is a method in which the surface layer of a polyurethane sheet obtained by wet coagulating a polyurethane solution is polished to make its surface suede-like. Are known. However, this method has a drawback in that the polishing debris is clogged with the porous layer on the surface of the polyurethane sheet during polishing. There is also a problem with the ability to retain cosmetics. Further, there is a drawback that it is difficult to obtain a thin suede-like sheet because a thickness of a certain thickness or more is required for polishing work.

[0003]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a suede-like sheet and a method for producing the same, which does not have the drawbacks of the conventional products and the conventional methods. More specifically, an object of the present invention is to provide a suede-like sheet which is not clogged, has an excellent ability to retain cosmetics, and has a uniform surface. It also provides a method for manufacturing a suede-like sheet that enables the acquisition of ultra-thin sheets.

[0004]

According to the studies made by the present inventors, the object of the present invention has been industrially advantageously achieved by the present invention having the following constitution.

[1] The hole diameter formed on the substrate is 5 μm to
A suede-like sheet formed by leaving a part of a polyurethane wet coagulation film layer having innumerable pores of 100μ on a base material and peeling it off with layer destruction.

[2] The suede-like sheet according to the above [1], which has a thickness of 150 to 600 µm.

[3] The suede-like sheet according to the above [1] or [2], wherein the base material is a polyester film.

[4] Particle size of 5 μ to 100 μ on the substrate
A water-soluble polyurethane-insoluble substance is added to the polyurethane solution in an amount of 1 to 60 parts by weight based on 100 parts by weight of polyurethane, and the resulting solution is wet-coagulated. A method for producing a suede-like sheet, which comprises peeling a thin film left on a surface of a base material.

[5] The substance having a particle size of 5 to 100 μm, which is soluble in water and insoluble in the solvent used for polyurethane, is selected from water-soluble polymers, inorganic salts and polysaccharides. The method for producing a suede-like sheet according to [4] above.

[6] The method for producing a suede-like sheet according to the above [5], wherein the water-soluble polymer is polyvinyl alcohol or carboxymethyl cellulose.

[7] The method for producing a suede-like sheet according to the above [5], wherein the inorganic salt is selected from glauber's salt, baking soda and salt.

[8] The method for producing a suede-like sheet according to the above [5], wherein the polysaccharide is sucrose.

[9] The method for producing a suede-like sheet according to the above [4] to [8], wherein the base material is a polyester film or a woven or non-woven fabric made of polyester fibers.

[10] A cosmetic puff which uses the suede-like sheet of the above [1] to [3] on the surface portion.

According to the present invention, when a sheet having a suede surface is manufactured by the wet coagulation method of polyurethane, the particle size of the inorganic salt, the water-soluble polymer, and the polysaccharide is added to the polyurethane solution applied on the substrate. By dispersing a substance that is 5μ to 100μ and is soluble in water and insoluble in the solvent used for polyurethane, a large space is opened in the obtained polyurethane microporous layer, and the layer wall of the microporous layer in contact with the substrate is thin,
Since it becomes thin and its part is easily broken, when the sheet is peeled from the base material, a thin film of polyurethane is likely to remain on the base material and at the same time, it is easily peeled off. Thus, according to the present invention, there is provided a suede-like sheet having no clogging, an excellent ability to retain cosmetics, and a uniform surface.

[0016]

The polyurethane used in the present invention may be of any type. For example, polyether type polyurethane, polyester type polyurethane, polycarbonate type polyurethane and the like can be mentioned. Of course, copolymerized polyurethanes and mixtures of two or more polyurethanes can also be used. The solvent for preparing the polyurethane solution is also not particularly limited, but dimethylformamide is preferably used.

In the present invention, various films, woven fabrics, knitted fabrics and non-woven fabrics are used as the substrate. Among them, polyester film, especially polyethylene terephthalate film, woven fabric, knitted fabric and non-woven fabric made of polyester fiber, especially polyethylene terephthalate fiber are preferably used.

In the present invention, the substances soluble in water and insoluble in the solvent used for polyurethane include inorganic salts such as Glauber's salt, baking soda, and salt, water-soluble polymers such as polyvinyl alcohol, carboxymethyl cellulose, and sucrose. Polysaccharides such as can be used. Water-soluble polymers are preferably used.
This material needs to have a particle size of 5-100 μm. When the particle size is less than 5 μ, it is difficult to expect the desired effects of the present invention, which is not preferable. Further, if the particle diameter exceeds 100 μ, too large pores are generated in the obtained sheet, and the morphological stability of the sheet deteriorates, which is not preferable.

In the present invention, the addition amount of such a substance is
It must be 1 to 60 parts by weight with respect to 100 parts by weight of polyurethane. If the amount added is less than 1 part by weight, the polyurethane microporous layer does not have a large space, so that the layer wall of the microporous layer in contact with the base material becomes thick and the sheet does not peel uniformly from the base material, and is difficult to peel off. Therefore, it is not preferable. On the other hand, if the amount added exceeds 60 parts by weight, the polyurethane microporous layer has too many large spaces, and as a result, the adhesion of the polyurethane resin to the substrate is reduced and the polyurethane resin peels off during wet coagulation. Therefore, it is not preferable.

[0020]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[Example 1] to [Example 3] and [Comparative Example] 4 shown in Table 1 in the polyethylene terephthalate film.
Polyurethane solutions of various types were coated at a rate of 640 g / m ² each, and the solution containing 10% by weight of dimethylformamide was used as a coagulating solution in a bath at 30 ° C.
The polyurethane coating liquid was wet-coagulated by immersion for 10 minutes, washed with water for 10 minutes, and dried with hot air at 140 ° C. The obtained polyurethane sheet was peeled from the polyethylene terephthalate film to prepare four types of polyurethane sheets. (Corresponding to Comparative Examples and Examples 1 to 3, respectively.) Specific product names of the polyethylene terephthalate film and the compound used for the compounding are as follows. In addition,
The additives in Table 1 include a foam stabilizer, a foaming agent, an antisettling agent, an antioxidant and a pigment.

Polyurethane elastomer: "CRISVON" MP-10 manufactured by Dainippon Ink and Chemicals, Inc.
5 Water-soluble polymer A (PVA): "Kuraray ball" made by Kuraray Co., Ltd. PVA-205S Water-soluble polymer A (CMC): "Serogen" made by Daiichi Kogyo Seiyaku Co., Ltd. Polyethylene terephthalate film: Unitika Ltd. Table 2 shows the peeling conditions of the polyurethane sheets of Examples 1 to 3 and Comparative Example.

[0023]

[Table 1]

[0024]

[Table 2]

As is clear from Table 2, the polyurethane sheets obtained in Examples 1 to 3 have good smoothness on the peeled surface. Moreover, it had a suede-like surface. On the other hand, the polyurethane sheet of the comparative example had a poor peeling condition and the smoothness of the peeled surface was also poor.

[Example 4] A polyurethane sheet was produced in the same manner as in Example 1 except that the substrate was changed from a polyethylene terephthalate film to a nonwoven fabric of polyethylene terephthalate fibers. This was a polyurethane sheet with a smooth suede surface.

[0027]

According to the present invention, there is provided a suede-like sheet having no clogging, an excellent ability to retain cosmetics, and a uniform surface. Therefore, this suede-like sheet is extremely useful as a puff material for makeup, for example. According to the present invention,
A new and useful manufacturing method for obtaining such a suede-like sheet has been provided.

Claims (10)

[Claims] 1. The pore size formed on the substrate is 5 to 100.
A suede-like sheet obtained by leaving a part of a polyurethane wet coagulation membrane layer having innumerable pores of μ on a substrate and peeling it off with layer destruction. 2. The suede-like sheet according to claim 1, which has a thickness of 150 to 600 μm. 3. The suede-like sheet according to claim 1, wherein the base material is a polyester film. 4. A polyurethane obtained by adding 1 to 60 parts by weight of a substance having a particle size of 5 to 100 μm, soluble in water and insoluble in a solvent used for polyurethane on 100 parts by weight of polyurethane on a substrate. A method for producing a suede-like sheet, which comprises applying a solution, performing wet coagulation, and then peeling off the generated wet coagulation film while leaving a thin film on the surface of the substrate. 5. A substance having a particle size of 5 μm to 100 μm, which is soluble in water and insoluble in the solvent used for polyurethane, is selected from water-soluble polymers, inorganic salts and polysaccharides. The method for producing a suede-like sheet according to claim 4. 6. The method for producing a suede-like sheet according to claim 5, wherein the water-soluble polymer is polyvinyl alcohol or carboxymethyl cellulose. 7. The method for producing a suede-like sheet according to claim 5, wherein the inorganic salt is selected from Glauber's salt, baking soda and salt. 8. The method for producing a suede-like sheet according to claim 5, wherein the polysaccharide is sucrose. 9. The method for producing a suede-like sheet according to claim 4, wherein the base material is a polyester film, a woven fabric or a non-woven fabric made of polyester fibers. 10. A cosmetic puff comprising the suede-like sheet according to claim 1 on its surface.