JPS59116479A - Leather like sheet article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention has excellent breathability, moisture permeability, and water repellency.

This invention relates to a silver-grained leather-like sheet material that is excellent in grain surface strength, appearance quality, texture, etc.

Conventionally, silvered leather-like sheets of various structures have been widely used as substitutes for natural leather for shoes, bags, belts, and even clothing. But from then on.

None of these sorted products satisfies both air permeability and moisture permeability at the same time, and even more satisfies when appearance quality, grain strength, and texture are taken into account.

There are two methods for imparting air permeability and moisture permeability to silver-covered leather-like sheets: 2) creating pores using a foaming agent, adding a water-soluble substance and extracting it to create pores, and wet coagulation. There are known methods for surface finishing porous membranes obtained by this method.

In these methods, the pores are randomly present. 1. If a large number of large pores are provided to satisfy both air permeability and moisture permeability, these pores become weak points, and the strength of the grain surface, especially It had drawbacks such as low cyclic tensile strength and cyclic shear strength, and loss of the depth of the single color of the surface gloss.

An object of the present invention is to provide a leather-like sheet material with silver finish that satisfies both air permeability and moisture permeability, and is also excellent in appearance quality and grain surface strength. That is, the leather-like sheet material of the present invention has the following structure.

(11) In a leather-like sheet material consisting of a fibrous base made of fibers or fibers and a polymer, and a silver surface, a plurality of pores are present in the grain surface, and the pores are mainly a concentration of a plurality of pores. A leather-like sheet material characterized by a group of pores.

In other words, 1) the present invention provides that when pores are provided on the silver surface of artificial leather in order to impart a certain degree of air permeability and moisture permeability, the pores are not provided randomly but are locally concentrated. be. As a result.

The following effects are produced.

Since the pores and non-porous areas have different gloss levels and different shades of color, the overall appearance has a harmonious, calm, two-tone gloss.

However, when kneading is applied, the ease with which the kneading can be applied is slightly different between the porous areas and the non-porous areas.

You can get a natural-looking massage.

In addition, it is preferable that a unique and unique effect can be obtained.0 Furthermore, such a table as "τ snow 4/I'1. 41! Water-based, does not impair the strength of the grain surface, but rather the non-porous area is affected by external forces. This is preferable because it shows strong resistance to

Although the sheet material of the present invention has excellent appearance quality and grain strength of 2 even if the area of the pores is large, these properties naturally deteriorate if the area of the pores is too large for the sheet as a whole. -If the area of the male pores is too small, it is unfavorable in terms of air permeability and moisture permeability. Therefore, moisture permeability. The points are moisture permeability 1. O'OOg/□・: It is preferable that 4' pores are present (,=U degrees).

The outline of an example of the method for obtaining the sheet product of the present invention is as follows.

First, a releasable support with a rough surface.

, by applying a thin layer of a high-molecular polymer solution having a uniform fluidity and removing a portion of the solvent of the solution to form a fibrous substrate <: tL
Put it on and peel it off after drying. Next, a releasable support having an uneven surface is pressed and dried, and then peeled off.

i, When using the IIIJ method, one of the convex parts of the concavo-convex support
1, some of the high molecular weight polymer in this area penetrates into the fibrous matrix, and pores are formed in this area. By adjusting the size, shape, pressure bonding conditions, etc. of the unevenness of the support, it is possible to obtain a sheet with a desired pore size and one area.

In addition, the thickness of the polymer coated on a smooth support depends on the size of the unevenness of the uneven support to which it is later pressure-bonded.

The thickness is determined by the IE bonding conditions, etc., and the important thing is that it has a thickness that allows pores to be formed by pressure bonding of the uneven support. Naturally, it also depends on the surface condition of the fibrous substrate.

In the above method, an uneven support may be used instead of the smooth support used initially. In this case, when pressurized with the uneven support for the second time, pores are substantially concentrated and formed in the thin portions of the concave portions of the uneven film that was first spread.

FIGS. 1 to 6 show the surface states of sheet products obtained when the uneven support is used and the film thickness is varied.

The area of the pores varies depending on the film thickness. The thicker the membrane, the more pores there are (Figure 1), and conversely, the thicker the membrane, the smaller the area of the pores (Figure 6).

In either case, the pores are not random but are locally concentrated. Figures 4 and 5 show examples in which the pores are randomly arranged, and the difference between the two and the sheet material of the present invention is recognized regardless of the number of pores.

As an example 7 of another method for obtaining the sheet material of the present invention, holes with a diameter of Φ1 may be mechanically provided in a leather-like sheet material having no pores. In this case as well, the holes are not provided at random, but in one concentrated manner as in the present invention.

Examples of the high molecular weight polymer for forming a silver surface include:

Polyurethane, polyurethane urea, polyamino acid, polyurethane amino acid type, polyamide, polyvinyl chloride,
These include polyester, polyvinyl acetate, polyacrylonitrile, natural rubber, synthetic rubber, and mixtures thereof, and if necessary, pigments, dyes, plasticizers, fillers,
Stabilizers and the like may also be added. In particular, polyurethane resin is preferred because of its soft feel, bending resistance, and abrasion resistance.

A transparent material is preferable for coalescence, and a colored transparent material is more preferable because it subtly intertwines with the color of the base layer and has a unique color matching effect.

Fibrous substrates are usually fine-grained natural and synthetic fibers.

Non-woven fabrics and woven fabrics consisting of ultra-fine fibers and ultra-fine fiber bundles formed from sea-island type fibers, peelable and split type fibers, etc.

It is a knitted fabric or a laminated or sandwiched product of these materials, and is coated with a polymer elastomer solution and/or kneaded or dispersion liquid, if necessary. At least one side of these fibrous substrates may be provided with a fluffy layer by raising, puff ink, or the like. It is preferable that such a fibrous substrate is colored, but if it is uncolored, it may be colored after imparting a silver surface. It is desirable to form a silver surface on this fluff layer. The finer the denier, the higher the fiber density of the fur layer.

Since the grain layer can be made thinner, products with a soft texture and excellent appearance quality can be obtained. If the surface of the fibrous substrate is made up of fine fibers and/or bundles thereof, the coating layer of the high molecular weight polymer can be made thinner due to its smoothness, reducing the rubbery feel (repellency) and creating a leather-like texture. Like and desirable.

In addition, the fibrous substrate may have two different hues and/or brightnesses.
When the two surfaces are coated with transparent or semi-transparent resin layers having the above colors, it is possible to provide a sheet product with a complex and rich three-dimensional effect. Such profits can be obtained by using two or more types of ultrafine fiber materials with different dyeability and dyeing each with different types of dyes (Japanese Patent Application No. 18969/1983).

In addition, one layer of fluff is forcibly exposed and the piloerection slopes.

A pattern is formed by portions that differ in at least one of the length of the nap and the thickness of the nap, and when covered with a transparent or translucent polymer, a unique pattern is permanently imparted. Such polishing, abrasion with a roll of sandpaper, or other mechanical, chemical, or thermal treatment J! 1! etc. (Patent application 1987)
-1891-904° As the support, smooth or uneven metal sheets, plastic sheets, resin-impregnated fibrous sheets, papers, etc. can be used. The size of the unevenness, the depth 2 ratio, etc. may be determined depending on the desired performance 2 quality.

The high molecular weight polymer can be applied to the support by various means such as knife coating, reverse roll coach ink, etc. In addition, it may be subjected to a massaging process to the extent that the effects of the present invention are not impaired.
It may be finished, heat treated, or heat pressed.

Embodiments of the present invention will be shown below, but the present invention is not limited thereto. Unless otherwise specified, 1% and parts are by weight.

Example 1 Island component is 70 parts polyester, sea component is 3 parts polystyrene
36 pieces of Shimamoto consisting of 0 parts, single thread Denny/l' 5.5
1. Needle punched felt was made using fiber length 511III+1. Next, this was shrunk, and an emulsion of solvent-resistant polyurethane was impregnated with the polyester resin to a solid content of 15%, and then the polystyrene was extracted and removed with trichlene. Furthermore, the polycabrolactone thread was impregnated with a 12% DMF solution of polyurethane, coagulated in water, thoroughly washed in hot water at 80°C, and dried. Next, both sides were puffed twice with #100 sandpaper, then twice with #150 sandpaper, and dyed at high temperature and pressure at 120°C with a jet dyeing machine to a thickness of 0.6 mm and a basis weight of 200 g. A dyed fibrous substrate with naps on both sides of /m' was obtained.

Next, a 5% solution of one-component polyurethane is applied to a releasable support with an uneven surface at a clearance of 0.02 m /m, and after drying, a 15% solution of two-component polyurethane is applied to the support with a clearance of 0. After coating to a thickness of 0.02 m/m and removing a portion of the solvent, it was laminated to the above fibrous substrate, fixed with a clearance of 0.1 m/m, dried, cooled, and peeled off.

Then, it was pressed using a metal roll heated to 100° C. with an uneven pattern on its surface.

The structure obtained was as shown in Figure 1.

The appearance quality was similar to natural leather in terms of two-color gloss, one-color depth, and texture. The breathability of this item is 09cc/cm”
, sec (JIS L 1079), moisture permeability is 4
, 8002 g/m', V (es z 02081).The water repellency was 95 points (JIS L 1079), which was extremely excellent.Natural leather (sheep) measured for comparison
The air permeability is 0.3 cc/Cm', SeQ, and the moisture permeability is 4.500 g/m', e.

The water repellency was 60 points.

As for the grain surface strength, we used a Scots type shear fatigue tester and determined that jIl + length ratio 15%? Observe changes in appearance (occurrence of cracks) after repeating 10,000 times 1. However, abnormally ↓2.
<;Mera no 1 was missing. Comparison natural leather (Nubu) O;
111 people) - Occurrence of cracks was observed.

Furthermore, the material is kneaded and pressurized using a rotating drum under moist heat, giving it a rough texture that gives it a natural feel and a warm appearance and feel. , the leather that is closer to natural leather is 1゛, condition No. 1, and I (). The air permeability of this thing is 0.95'C/c
m ec, moisture permeability is 5,050 cc/m', ? , the water repellency is 95 points, and the grain strength is A as above.
Phase stability [7], but no abnormality was observed 1. Examples 2 to 3 Same as Example 1. However, Xansol was obtained by changing the thickness of the silver film and varying the area of the pores.

The quality characteristics of JL et al.'s product are listed in Table 1.

Example 4 Cilia 1 (an undyed substrate was used, and after imparting a silver surface, t
f Evening flow f←High 1.1++'+High 1f using a coloring machine: Follow the procedure of Example 1 except for dyeing, to obtain a -C leather-like/-gold product.

This one has a texture of 1'f fFI V (1, 1,') with an irregular fill, giving it a natural feel with a depth of 11.
,! 11 and -・Body 1 [It is of a certain texture/-9
- Husband゛jKji Rent 115 4i&#If Jj As the base, polyester filament I 50 t3/''
l'', weft 162/1l-=J weaving/,-,2/
', S twill was dyed at a high temperature using a liquid jet brown color machine [-1:, Dyeing 1-, fiber & II substrate was dyed 7', -,,, and then the same Jj method as in Example 1 was applied. A V-shaped sheet product was obtained. /,
A convex support was used instead of a support with a diameter of 1/7 to 1'fl. - Ventilation of this thing 1'4Q: i 1.1,
e, "= m', sec, transparency W is 5.500 g
/+n', 24 hours, 2 breathability, moisture permeability are both excellent / this 1,

[Brief explanation of drawings]

Fig. 1-61 is a microscopic photograph of the surface of a leather-like sheet according to the present invention. Figs. 4 and 5 are II'T
1 is a micrograph of the surface of a conventional example. 1st section 2nd figure 3i 4m 5th agony = 439-

Claims (1)

[Claims] (1) In a leather-like sheet material consisting of a fibrous base made of fibers or fibers and a polymer, and a silver surface, a plurality of pores are present in the grain surface, and the pores are mainly composed of a plurality of pores. A leather-like sheet material characterized by a concentrated group of pores.