JP3085548B2 - Leather-like sheet laminate and molded product thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leather-like sheet laminate having good shape formed by thermoforming and a molded product thereof.

[0002]

2. Description of the Related Art Conventionally, a camera-like case, cases, and bags are processed by heating and molding a leather-like sheet. For example, Japanese Unexamined Patent Publication No. 63-65322 discloses forming a camera case by laminating a backing cloth on artificial leather and performing high-frequency processing. And JP-A-2-21805.

[0003]

In the case where a conventional leather-like sheet such as artificial leather is drawn and formed to produce a molded product, the temperature of the leather-like sheet is set to a high enough temperature for thermoforming. It is performed by a method of pressing a material to be molded under high pressure. For this reason, a molded product that emphasizes shapeability has a significantly impaired leather-like appearance, and is a product having a hardened touch and texture.

An object of the present invention is to provide an excellent leather-like sheet-like laminate which is easy to heat-mold at a low temperature, has good shapeability and does not impair the appearance of the leather , and a thermoformed laminate. /> Provide a molded article.

[0005]

SUMMARY OF THE INVENTION The present invention provides a fibrous sheet.
A coating layer consisting of a porous layer or a non-porous layer on one side
One of the silvered leather-like sheets or fibrous sheets
Suede-like leather-like sheet with a fiber raised surface on the surface
Object was a surface layer, on the back surface, the resin intermediate layer and backing layer
In the laminated body sequentially laminated , the resin intermediate layer is a resin having a molding temperature at least 30 ° C. lower than the molding temperature of the other layers .
A leather-like sheet stack, characterized in that Ranaru.

The present invention also provides a laminate comprising a surface layer of a leather-like sheet, a resin intermediate layer and a backing layer,
A leather-like sheet laminate characterized in that the intermediate layer is made of an ionomer resin and has a molding temperature at least 30 ° C. lower than the molding temperature of the other layers.

[0007] The present invention also provides a molded article of a leather-like sheet material characterized by being formed by thermoforming the above-mentioned leather-like sheet material laminate.

[0008] The leather-like sheet used in the present invention may be a knitted fabric, a woven fabric, a nonwoven fabric, or a fiber assembly obtained by integrating a knitted fabric and a nonwoven fabric made of synthetic fibers and / or regenerated fibers or natural fibers. Fabrics or those fabrics,
For example, polyurethane elastomer, acrylonitrile-butadiene-based polymer, fibrous sheet such as cloth containing an elastic polymer such as styrene-butadiene-based polymer,
In particular, a flexible and dignified fibrous sheet containing a polymer mainly composed of polyurethane elastomer in a fiber entangled nonwoven fabric of a synthetic fiber having a fineness of 3 denier or less is used as a base layer, and a polyurethane elastomer is provided on one surface of the fibrous sheet. Finishing the sheet-like material obtained by providing a porous layer or a non-porous surface coating layer of a polymer mainly composed of a polymer with high bending fatigue resistance such as plasticized polyvinyl chloride, and coloring it. Or a so-called silvery leather-like sheet having a smooth surface or a molded surface, or a so-called suede-like leather-like sheet obtained by forming a fibrous raised surface on one surface of the fibrous sheet. The thickness of the leather-like sheet is appropriately determined in accordance with the intended use of the product, but the normal thickness is 0.5 to 3.0 mm.

The resin constituting the intermediate layer is a resin having a molding temperature at least 30 ° C. lower than the molding temperature of the surface layer and the backing layer, and is usually a resin having a molding temperature in the range of 80 to 170 ° C. For resins with high molding temperatures, the thermoforming temperature for obtaining good shapeability is high, so there is no difference from conventional thermoforming of leather-like sheet-like products, resulting in molded articles with many defects, while for resins with low molding temperatures, Deformation may occur due to heat treatment applied in a later step, for example, curing of an adhesive. The molding temperature referred to in the present invention is determined by comparing the sheet material constituting each layer with a temperature at which the heat setting rate measured in accordance with JIS K-6546 "Hemispherical plasticity test method for leather" is 40% or more. A resin having a molding temperature difference of at least 30 ° C., preferably at least 40 ° C. is used. Examples of such a resin include polyethylene, ethylene copolymer, polypropylene, ethylene vinyl acetate copolymer or a partially saponified product thereof, polybutylene terephthalate, polyhexamethylene terephthalate, 6-nylon, 11-nylon, and 12-nylon. From the viewpoint of form stability after molding, it is necessary to use a resin having a flexural modulus at room temperature of 1500 kg / cm ² or more, preferably 2000 kg / cm ² or more. However, even if the resin satisfies the above requirements, for example, a resin such as isoprene rubber and butadiene rubber which does not maintain heat fixability for a long period of time is outside the scope of the present invention. By selecting a segment, a resin having a composition satisfying the above requirements can be obtained.

It is another object of the present invention to provide a molded article which imparts particularly good shapeability and toughness to the leather-like sheet-like laminate of the present invention and does not impair the appearance and feel of the leather-like sheet-like article. In this case, for example, a copolymer of olefin or olefin such as ethylene or propylene and another vinyl monomer and 3 to 10 mol% of a metal salt such as methacrylic acid or acrylic acid or a vinyl monomer which forms a metal crosslink is copolymerized. By using an ionomer resin obtained by cross-linking the obtained copolymer with metal ions for the intermediate layer, low-temperature thermoforming can be performed and a laminate having good shape stability can be obtained. The thickness of these resin layers is appropriately selected depending on the thickness of the leather-like sheet and the thickness of the laminate, but is usually a film or sheet having a thickness of 20 to 500 μm. If the thickness is out of this range, a sufficient fixing effect cannot be obtained or the thermoforming cycle becomes longer, which is not preferable.

The backing material of the leather-like sheet laminate is appropriately selected depending on the use of the molded article. Usually, a knitted fabric made of synthetic fiber and / or regenerated fiber or natural fiber,
Woven fabrics, non-woven fabrics or fabrics such as fiber aggregates of knitted and non-woven fabrics, or those fabrics, for example, polyurethane elastomer, acrylonitrile-butadiene-based polymer, styrene-butadiene-based polymer such as elastic polymer A material selected from the contained fibrous sheet, polyester, polyethylene, polypropylene, polyamide, ethylene vinyl acetate or a partially saponified product thereof, a synthetic resin film such as a vinyl chloride polymer, a sheet, or the like is used. In particular, when a leather-like sheet containing an elastic polymer in a non-woven fabric is used as a backing material, deep drawing can be performed, and even from the appearance of the laminate, it becomes a single leather-like sheet itself, and a high-quality molded product Is obtained.

Next, a method for forming a leather-like sheet-like laminate and a method for producing a molded article comprising the same comprises applying a resin film or a sheet-like material and a backing material to the back surface of a desired leather-like sheet, The temperature at which is softened or melted,
Preferably, a hot plate press or a hot roll press is performed at a temperature of 170 ° C. or less to produce a leather-like sheet-like product laminate in advance, or melt the resin for the intermediate layer between the back surface and the backing of the leather-like sheet-like material. A method of extruding and forming a laminate by a roll press, and then thermoforming a molded article having a desired shape at a molding temperature of the intermediate resin layer. The material is placed on a molding die and thermoformed at a molding temperature of the intermediate resin layer, preferably at a temperature of 170 ° C. or less, to form a molded body of a desired shape composed of a leather-like sheet-like laminate at once. How to

[0013] The molded article of the leather-like sheet laminate includes cases, bags, luggage, school bags, shoes, daily necessities, furniture furniture, interior decoration articles, sporting goods, and interiors of automobiles and vehicles. Processed into materials and parts for clothing design and used. In particular, it is suitable as a deep drawn product.

Next, a leather-like sheet laminate of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a leather-like sheet laminate, and FIG. 1 (1) is a leather-like sheet laminate comprising a surface layer of a silvered leather-like sheet 2, a resin intermediate layer 4 and a backing layer 5. FIG. 1 (2) shows a leather-like sheet-like laminate composed of a surface layer of a suede-like leather-like sheet 3, a resin intermediate layer 4 and a backing layer 5.

[0015]

According to the present invention, as a laminate comprising a surface layer of a leather-like sheet, a resin intermediate layer and a backing layer, a resin having a molding temperature of at least 30 ° C. lower than that of other layers, By using the ionomer resin, the leather-like sheet-like laminate can be thermoformed at a low temperature and imparts good shapeability and toughness, and the appearance and feel of the leather-like sheet-like thing Can be obtained.

[0016]

Next, embodiments of the present invention will be described with reference to examples. In the examples, parts and% relate to weight unless otherwise specified.

Example 1, Comparative Example 1 The surface of a fibrous base layer made of an entangled nonwoven fabric of nylon ultrafine fiber bundle fibers and a polyester / polyether-based polyurethane elastomer was finished to an ultrafine fiber raised surface, and dyed and finished. On the back side of the obtained 0.8 mm-thick suede-like leather-like sheet (heat treatment temperature exceeding 140% at a heat setting rate exceeding 40%), an ionomer resin film having an average thickness of 100 μm (ethylene-methacrylic acid copolymer A sheet-like product obtained by slicing the above-mentioned fibrous base layer to a thickness of 0.4 mm (heat treatment temperature exceeding 40%) was applied to the crosslinked metal, heat treatment temperature of 65 ° C. exceeding a heat setting rate of 40% as an intermediate layer. (C ° C or higher) as a backing, heat-treats the backing at 95 ° C. on the heat-treated drum surface, presses it at a gauge pressure of 1.5 kg / cm ² , and laminates the leather-like sheet. I got a body.

This leather-like sheet-like laminate is used as a skin material for a handbag, cut into a desired handbag mold, ironed at a low temperature, fixed and fixed, and sewn and attached members. The product obtained is excellent in mold cohesion and shape retention, and a good product without impairing the appearance of suede-like solid napped, terry-like appearance, elastic touch, etc. Obtained.

For comparison, a handbag was similarly processed using a leather-like sheet laminate obtained by laminating the suede-like leather-like sheet of Example 1 and a sliced sheet through a polyurethane adhesive. However, since the mold was not sufficiently formed, the mold was not cohesive.

Example 2 A colored porous coating layer of a polyester-based polyurethane elastomer was formed on the surface of a fibrous base layer composed of an entangled non-woven fabric of polyethylene terephthalate ultrafine fiber bundle fibers and a polyester-based polyurethane elastomer, followed by coloring and embossing. 1.2mm-thick leather-like sheet material having a treated surface (heat treatment temperature 140
On the base layer surface of the base material layer (100 ° C. or higher), an ionomer resin film having an average thickness of 100 μm (a cross-linked metal of an ethylene-methacrylic acid copolymer, a heat treatment temperature of more than 40% and a heat treatment temperature of 65 ° C.)
, And heat-treated from the backing surface at 95 ° C of the heat-treating drum at a heat treatment drum surface temperature of 1.5 kg / cm. Pressing at ² gave a leather-like sheet laminate. This leather-like sheet-like laminate was molded at a molding temperature of 145 ° C. using a vacuum draw molding machine to form a camera lid.

The obtained molded article is excellent in unity and shape retention of the mold, and has good appearance without damaging the solid-like appearance and elastic touch of the leather-like surface. A product having excellent bending fatigue resistance against bending was obtained.

Example 3 and Comparative Example 2 The unstretched film of a polyhexamethylene terephthalate-based polyester film having an average thickness of 150 μm was used as the resin for the intermediate layer on the surface of the leather-like sheet-like material with silver of Example 2 (heat fixation ratio: 40). % Heat treatment temperature of 75 ° C.) as an intermediate layer, and further, a laminate having nylon tricot as a backing is placed on a molding die for the outside of a bag, deep-drawn at a molding temperature of 150 ° C., and then The bag obtained by attaching the reinforcing material of the body of the bag, holding the handle, etc. has excellent mold cohesion and shape retention, and has a solid leather-like sheet-like material with a solid appearance and elasticity. The touch was good without impairment.

For comparison, a nylon tricot was laminated on the silver-skinned leather-like sheet of Example 2 via a polyurethane adhesive and deep-drawn at a molding temperature of 150 ° C., but sufficient drawing could not be performed. The cohesion of the mold was poor and the shape retention was not good. Then, in order to obtain a molded body having the same degree of mold cohesion and shape retention as in Example 3, the molding temperature was raised to 185 ° C. and deep drawing was performed. As a result, the molded body was entirely hardened and had a leather-like appearance. The tactile sensation was impaired, resulting in a vinyl-like product.

[0024]

The leather-like sheet laminate of the present invention can be thermoformed at a low temperature, imparts good shapeability and toughness, and has a solid feeling of the leather-like sheet material. A leather-like sheet-like molded product having a stable form, high delamination strength and high bending fatigue resistance, which does not impair the good appearance and tactile sensation, can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a leather-like sheet laminate of the present invention.

[Explanation of symbols]

 1 Leather-like sheet laminate, 2 Leather-like sheet with silver, 3 Suede-like leather-like sheet, 4 Resin intermediate layer, 5 Backing layer.

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI D06N 3/08 DAD D06N 3/08 DAD // A45C 3/00 A45C 3/00 Z (58) Field surveyed (Int.Cl. ⁷ , DB name) D06N 3/00-3/18 A45C 5/02 B32B 7/02 B32B 27/12 B32B 27/32 101 A45C 3/00

Claims (3)

(57) [Claims] 1. A porous layer or a porous layer on one surface of a fibrous sheet.
A leather-like sheet with silver provided with a coating layer consisting of a non-porous layer
Forming a fiber-raised surface on one side of a sheet or fibrous sheet
Suede-like leather-like sheet as the surface layer
To, the laminate resin intermediate layer and backing layer are sequentially stacked
Oite, leather-like sheet laminate the resin intermediate layer is characterized in that it consists of at least 30 ° C. lower molding temperature of the resin than the molding temperature of the other layers. 2. The leather-like sheet-like laminate according to claim 1, wherein the resin intermediate layer of the leather-like sheet-like laminate according to claim 1 is made of an ionomer resin. 3. A molded article of a leather-like sheet laminate obtained by thermoforming the leather-like sheet laminate of claim 1 or 2.