JPH07288Y2 - Film composite sheet with drape - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a flexible, draping property in which a film having rubber elasticity having an uneven pattern on its surface (hereinafter abbreviated as an elastic film) is laminated and joined integrally. The present invention relates to a composite sheet that is rich in color and has a good appearance and touch.

[Conventional technology]

Conventionally, various uniaxially or biaxially stretched films in which polymer chains are highly oriented in the stretching direction and crystallized to form a dense surface are rigid and poor in flexibility, and are called so-called film-like, Shows gloss and texture.

Further, these stretched films can be provided with an uneven pattern by performing embossing or the like in a state where the surface thereof is heated to a temperature equal to or higher than the softening point of the film, but in this case, the form of the stretched film by heat or When the excellent physical properties are impaired or when the stretched film is laminated with the base material or the like, it is not always easy to peel from the base material or the like due to heat shrinkage of the stretched film layer and form an uneven pattern on the surface. That wasn't the case.

JP-B-55-51742 discloses a film product having an uneven pattern on its surface, which is obtained by stretching a film made of a polyolefin resin containing inorganic fine particles and forming a large number of voids inside to make it opaque. There is proposed a pseudo-skin-like product obtained by sticking synthetic paper to a sheet-like base material and embossing or rubbing the surface of the stuck body.

However, the film layer on the surface of this pseudo-derivative has insufficient crack resistance and abrasion resistance, and by embossing or rubbing, the film layer is cracked or fibrillated to form fluff. There is a problem in terms of durability and the like that the appearance is easily damaged.

On the other hand, an elastic film, for example, a film rich in elasticity obtained from a polyurethane-based polymer has excellent flexibility, but has a large elastic recovery property, and at a low temperature of 100 ° C. or lower,
It was difficult to form an uneven pattern by mechanical shaping such as embossing or wrinkling. In addition, since such an elastic film has high elongation and elastic recovery property, it is difficult to process it into a product and difficult to handle, so it is rarely used alone, and is represented by synthetic leather or artificial leather. It is often used by being laminated and integrated on various base materials such as knitted fabrics.

However, in the case of a composite sheet in which the elastic film is laminated on these various base materials and integrated, the uneven pattern is often due to the deformation of the base material layer, and when the uneven pattern is formed at a temperature of 100 ° C. or higher. The elastic film may be deteriorated or its physical properties may be deteriorated, and if it is formed at a low temperature of 100 ° C. or less, the uneven pattern formed on the elastic film surface easily disappears with time, and the thermoforming of the composite sheet or It was sometimes lost in post-processing steps such as heat bonding.

[Problems to be solved by the device]

The object of the present invention is to provide a composite surface layer made of an elastic film which is flexible and has a good drape property, which has excellent physical properties as an elastic film without being thermally deteriorated even though it has an uneven pattern. Is to provide a sheet.

[Means for Solving the Problems]

The composite sheet of the present invention comprises a film having rubber elasticity having an elongation of at least 300% under a load of 5 kg, a substrate, and a stretched film which is interposed and laminated between the film having the rubber elasticity and the substrate. It is characterized in that an uneven pattern is formed on the surface of the film which is composed of a void film and has rubber elasticity.

The figure is a schematic cross-sectional view showing one embodiment of such a composite sheet of the present invention. As shown in the figure, the composite sheet 1 of the present invention
Is composed of an elastic film layer 2, a stretched void film layer 3 and a base material layer 4 on the surface thereof.
Has an uneven pattern.

The elastic film used in the present invention is required to exhibit rubber elasticity such that the elongation under load of 5 kg is at least 300%, and it is necessary to stack films having such elastic recovery rate for the first time. It can be made into a flexible and drapeable composite sheet.

Specific examples of the elastic film having an elongation under load of 5 kg of at least 300% include, for example, diethylene-diisocyanate, trimethylene-diisocyanate, tetramethylene-diisocyanate, pentamethylene-diisocyanate, hexamethylene-diisocyanate,
Heptamethylene-diisocyanate, octamethylene-
Diisocyanate, toluylene diisocyanate, m
-Urethane-based resins obtained by the reaction of diisocyanates such as phenylenediisocyanate and p-phenylenediisocyanate with polyethers, polyesters, polyether / ester block copolymers, nylon composed of polyamide resin components, aromatics Dicarboxylic acid and aliphatic dicarboxylic acid as an acid component, 1.4
There is a film obtained by dry or wet film forming using a polyester containing butanediol as a glycol component, a polyolefin homopolymer or copolymer such as ethylene or propylene, and a mixture thereof.

further When Polyester consisting of a combination of, and-[CO-PA-CO
_{O-PE-O] n -} ( where, PA is _{- [NH (CH 2) 10} CO]
There are melt-extruded films of polyamide components such as _n − and — [NH (CH ₂ ) ₁₁ CO] _n − and polyamide components such as PE is a polyether component such as — [(CH ₂ ) _p O] _g −).

A thin film (stretched film, coating, etc.) having a thickness of 25 μm or less may be provided as a protective film on the surface of the elastic film.

The thickness of this elastic film is usually 5μ to 150μ.
The degree is good.

The concavo-convex pattern of the elastic film layer of the composite sheet of the present invention is formed by laminating the elastic film with a stretched void film, and by laminating the elastic film on the stretched void film, the stretched void film layer is formed. It is possible to prevent the occurrence of cracks and eliminate defects due to its low wear resistance. That is, in the present invention,
It can be said that the elastic film layer and the stretched void film layer are inseparable from each other in compensating for their weak points and utilizing the characteristics of both.

As such a stretched void film, a film-forming polyolefin containing a filler (inorganic filler),
It is a film obtained by forming a resin such as polyester, polyamide, or polyvinyl chloride by a known melt film forming method or the like and forming a large number of voids inside by stretching. Preferably, it is excellent in the formation of uneven patterns, mechanical properties, particularly good in crack resistance and wear resistance, the heat deterioration temperature of the heat-resistant film or less, preferably a film that can be shaped at a temperature of about 100 ℃ or less. , For example, the content of filler is 10-40% by weight,
A film obtained from a polyolefin resin or polyester resin having a void ratio of 30 to 60% is preferable.

The polyolefin-based resin contains at least 50% by weight or more of polypropylene resin, polyethylene or ethylene-propylene copolymer (random or block), prepten-1, ethylene-propylene-diene terephthalate with respect to the polypropylene resin. A resin mixture containing a resin such as an original copolymer may be used.

As the polyester resin, there is one containing at least 50% by weight or more of polyethylene terephthalate.

The stretched void film may be either a single film or a composite film. Further, it may be a stretched void film in which a stretched film made of the same resin component having no void is integrated on at least one surface.

Examples of fillers mixed in the resin forming the stretched void film include calcium carbonate, magnesium carbonate, alumina, aluminum silicate, kaolin, kaolinite, talc, clay, diatomaceous earth, dolomite, titanium oxide, magnesium oxide, and zeolite. Inorganic fine particles and polymer particles made of a synthetic resin different from the synthetic resin component forming the film, for example, for a film containing polyethylene terephthalate as a main component, particles made of a polyolefin resin, for polypropylene film Polymer particles having different compatibility with the polyester resin may be mentioned, and these fillers may be blended alone or in combination of at least two types. Among the inorganic fine particles, it is preferable to use one mainly composed of calcium carbonate.

In addition to the filler, a heat stabilizer, an antioxidant,
It goes without saying that various additives such as weathering agents, antistatic agents, nucleating agents and the like can be appropriately added.

The blending amount of these fillers is 10 to 10 with respect to the resin.
The content of 40% by weight, preferably 15 to 35% by weight, is preferable, and if it is less than 10% by weight, the stretch void film has insufficient concavo-convex formability and shrinkability, and the elastic film layer has a poor concavo-convex pattern developability. If the amount is more than 40% by weight, the mechanical properties of the stretched void film deteriorate.

The void ratio of the stretched void film is 30% to 70%, preferably 30% to 55%. This void rate is 60
%, The mechanical strength will decrease significantly, and if less than 30%, the concavo-convex pattern forming property will decrease.

Here, the void ratio (%) means that when the density of a film having a void is ρ ₀ , the film is thermocompression bonded near the melting point of the synthetic resin of the component, and the density of the film in which the void is filled is ρ, It is a value defined by the following formula.

The density of the film is calculated from the weight and the volume (thickness x area) of the film. The void ratio is a value before the unevenness is formed on the composite sheet of the present invention. Void ratio (%) = [(ρ−ρ ₀ ) / ρ] × 100 The elastic film and the stretched void film are respectively It is preferable to perform corona discharge treatment in an atmosphere of air, carbon dioxide gas or an inert gas to improve adhesion and adhesiveness for composite integration.

The thickness of the composite film obtained by laminating the elastic film and the stretched void film is preferably 30 μ to 200 μ, and the constituent ratio of the thickness of the composite film (stretched void film / elastic film) is preferably 0.75 or less. If the thickness of the stretched void film in this composite film is too large, the composite film peels from the substrate layer, or the morphological stability of the composite sheet itself is impaired, and if it is too thin, the unevenness of the elastic film layer in the composite sheet The pattern developability decreases.

On the other hand, the base material layer 4 not only supports the composite film layer, but also by appropriately selecting its type and combining it with the uneven pattern, the flexibility, volume and cushioning property of the composite sheet of the present invention can be obtained. In addition, it is possible to improve mechanical strength, especially tear resistance, and further improve the non-film-like appearance or feel. Examples of such a flexible substrate include various knitted fabrics, non-woven fabrics, papers, foams and the like. These base materials may be impregnated to make good use of the drape property, applied, treated such as brushed, and it is preferable to use a knitted fabric that does not impair the flexibility and the drape property of the composite sheet. Good.

As the adhesive for joining and integrating the films constituting the composite sheet of the present invention and between the composite film and the substrate, a reactive or self-crosslinking polyacrylic ester adhesive, urethane adhesive Examples thereof include synthetic polymer adhesives such as adhesives and epoxy adhesives, and rubber adhesives.

Furthermore, the composite sheet of the present invention can be subjected to metal deposition, printing, etc. on the stretched void film layer, and
At least one laminating surface between the elastic film layer and the stretched void film layer and between the stretched void film and the base material is provided with a thin fabric under a condition that does not impair the flexibility or drapeability of the composite sheet of the present invention. It is possible to add an appearance and a function according to the use and purpose by interposing a cloth or the like.

As a method of manufacturing the composite sheet of the present invention, it is general that an elastic film and a stretched void film are laminated and bonded in advance to form a composite film, and a base material is bonded to the stretched void film surface of the composite film. However, it is also possible to bond the stretched void film to the base material, and superpose the elastic film on the stretched void film surface for bonding.

The elastic film surface of the composite sheet thus obtained is subjected to embossing with an embossing roll or embossing plate, mechanical rubbing, wrinkling with a tumbler, creping with crepe paper, pleating, etc., alone or in combination. Then, the uneven pattern is provided.

In order to prevent thermal deterioration of the elastic film layer constituting the composite sheet, a temperature at which the stretched void film layer selectively heat shrinks, preferably heat treated at a temperature of 100 ° C. or less, at the same time as imparting mechanical unevenness, It is preferable that the stretched void film layer is heat-shrinked. Further, by performing heat treatment under such conditions, it is possible to form wrinkles due to thermal contraction of the stretched void film on the elastic film surface.

The composite sheet of the present invention having an uneven pattern thus obtained can form an uneven pattern on the elastic film surface by a simple operation such as rubbing by hand, and the uneven pattern of a product manufactured from this composite sheet It can be changed by the user himself.

〔Example〕

 Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1 Melt index (MI) based on ASTM-D1238 is 1.0
20% by weight of calcium carbonate having a particle size of 1.7 μ was blended with the polypropylene resin of 1. to prepare a resin composition. This resin composition was melt-cast by a known melt-casting method to prepare an unstretched film. This unstretched film is set to 3.5 in the vertical direction.
The film was stretched biaxially 9 times in the horizontal direction and heat-fixed to prepare a stretched void film having a thickness of about 60μ.

An elastic film made of polyurethane with a thickness of about 25μ was bonded to this stretched void film using a urethane adhesive "Seika Bond" E260 / C26 manufactured by Dainichiseika Co., Ltd., and laminated to obtain a composite film. It was

Then, using the above urethane-based adhesive, a 50/50 mixed-spun plain weave of polyester fiber and rayon was bonded to the stretched void film surface of this composite film as a scratch.

The resulting composite sheet was heated at about 110 ° C. to emboss the surface of the polyurethane elastic film to form an uneven pattern.

The obtained composite sheet having an uneven pattern on the surface was flexible and rich in drape, and had a unique gloss and touch due to the uneven pattern.

Example 2 Biaxially stretched void ester film containing filler "Lumirror" E60, 50μ (manufactured by Toray Industries, Inc.) "Hytrel" elastic polyester (manufactured by Toray DuPont) with urethane adhesive on one side 4056) was joined to a sheet of melt extruded 70μ.

Then, on the stretched void film surface of this composite sheet, a urethane adhesive (“Seika Bond” E260 / C26 manufactured by Dainichiseika Kogyo Co., Ltd.) was used with a 50/50 blended plain weave of polyester fiber and rayon as a base material. Joined.

The obtained composite sheet was rubbed at room temperature (clamping machine manufactured by Yamasa Giken Co., Ltd.).

The elastic polyester surface has a skin-like look without the wrinkle-like pattern disappearing.

Comparative Example 1 An elastic polyester (Hytrel "4056" manufactured by DuPont Toray Co., Ltd.) was melt-extruded at 70 μm and bonded to a 50/50 blended plain weave base material of polyester fiber and rayon. This composite sheet was kneaded at room temperature (clamping machine manufactured by Yamasa Giken Co., Ltd.).

No uneven wrinkled pattern could be applied to the surface of the elastic polyester.

[Effect of device]

Since the surface of the composite sheet of the present invention has an elastic film layer having excellent elasticity, it is flexible and has a good drape property, and the unevenness of the surface makes the appearance and gloss rich in variation and decorative. It is excellent, soft to the touch and warm.

Furthermore, the composite sheet of the present invention has an uneven pattern formed by mechanical shaping by embossing or wrinkling without substantially deteriorating or damaging the elastic film layer by selecting the type of the stretched void film. Can be formed. By combining this mechanical shaped pattern with the above-mentioned metal vapor deposition, printing, etc., the surface of the composite sheet of the present invention can be made more complicated, beautiful and precise, and diversified as a product. it can.

The composite sheet of the present invention has excellent flexibility and is capable of forming a concavo-convex pattern on the elastic film layer due to the stretched void film layer. It has a feature that an uneven pattern can be easily formed by rubbing. Due to this feature, before or after commercialization, the composite sheet of the present invention is subjected to artificial rubbing treatment to form wrinkles having different shapes, numbers, sizes, depths, etc., and the appearance and gloss of each product can be improved. It is possible to change, that is, individualize.

Therefore, the composite sheet of the present invention can be used alone or in combination with existing materials for clothing, and by taking advantage of its good drapeability, curtains, table cloths, chair covers, wall materials, floor materials, and cover materials. It can be applied to many fields such as materials, furniture, interior materials for automobiles, binding materials such as books and stationery, bags, and materials for bags.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of the composite sheet of the present invention. 1 ... Composite sheet, 2 ... Elastic film layer, 3 ... Stretched void film layer, 4 ... Base material layer.

Claims (1)

[Scope of utility model registration request] 1. Elongation under a load of 5 kg is at least 300%.
A film having rubber elasticity, a base material, and a stretched void film interposed between the film having rubber elasticity and the base material, and having a concavo-convex pattern on the surface of the film having rubber elasticity. A film composite sheet having a drape property formed.