JPH01192882A - Highly moisture-permeable leathery sheetlike material - Google Patents

Abstract

PURPOSE:To obtain the title highly moisture-permeable sheetlike material close to natural leather, by constituting a dry film of a specific undercoating layer and topcoating layer in combination in a leathery sheet prepared by laminating the dry film of a polyurethane elastomer to a substrate. CONSTITUTION:A polyurethane elastomer layer laminated to a substrate in a leathery sheetlike material obtained by a conventional dry method is constituted of (A) an undercoating layer consisting of a polyurethane elastomer containing 20-50wt.% polyethylene glycol as a polyol component and (B) a topcoating layer consisting of a polyurethane elastomer containing 5-18wt.% polyethylene glycol as a polyol component and the total amount of both is within the range of 20-70g/m<2> expressed in terms of the elastomer weight. Thereby, the aimed leathery sheet having a moisture permeability as high as 4mg/cm<2> hr, rich in water and heat resistance and excellent in fashionability and functionality is obtained. Furthermore, the weight ratio (elastomer weight ratio) of both layers (A) and (B) is preferably within the range of 2:1-3.5:1.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a novel leather-like sheet-like material, and more specifically, it has extremely high moisture permeability, excellent surface feel and texture, and is low cost. In particular, the present invention relates to a leather-like sheet material suitable for use as artificial leather for shoes, clothing, etc.

(Prior art) In recent years, as highly moisture permeable artificial leather, so-called wet-processed artificial leather, which is produced by wet-graining using polyurethane elastomer on a base material such as resin-impregnated nonwoven fabric, and then applying various finishing touches, has generally been used. ing.

However, this wet-processed artificial leather has a revolutionary high moisture permeability compared to the previous dry-processed artificial leather with a silver surface (dry coating), but its value is higher than that of natural leather. It falls far short of that. In addition, in the case of wet-processed artificial leather, the thickness (weight) of the grain side has to be kept within a certain level due to mechanical strength and processing constraints, so dry processing is preferable in terms of fashionability and functionality. It is often inferior to other methods, and is also disadvantageous in terms of cost.

On the other hand, it has been proposed to use an elastomer that itself has high moisture permeability as a polyurethane elastomer for silver surfaces to produce artificial leather with high moisture permeability using a dry method. However, this method has not yet been put to practical use because it generally has poor water pressure resistance and poor surface texture.

(Problems to be Solved by the Invention) The present invention was made under the above-mentioned technical circumstances, and its purpose is to provide high moisture permeability far superior to conventional wet-type artificial leather. The object of the present invention is to provide a novel leather-like sheet material that is lightweight, fashionable, and highly functional. Another object of the present invention is to provide a leather-like sheet material that is more cost-effective than wet-laid artificial leather.

(Means for Solving the Problems) That is, the present invention provides a leather-like sheet material formed by laminating a dry film of a polyurethane elastomer on a base material, wherein the dry film is made of a polyurethane elastomer of the following (A). This is a highly moisture permeable leather-like sheet material characterized by being comprised of an undercoat layer consisting of (A) and a top coat layer consisting of polyurethane elastomer (A).

(A) A polyurethane elastomer in which 20 to 50% by weight of its polyol component is polyethylene glycol (B) A polyurethane elastomer in which 5 to 18% by weight of its polyol component is polyethylene glycol In the leather-like sheet material of the present invention, The base material can be anything that is normally used as a base material for artificial leather, such as woven or knitted fabrics made of natural fibers, synthetic fibers, their raised fabrics and non-woven fabrics, as well as aggregates of these fibers filled with binders. Among these, those using a binder are particularly preferred.

As the fibers constituting the fiber aggregate, it is preferable to use fibers with a fineness of 6 d or less from the viewpoint of the texture of the resulting leather-like sheet material.

Various elastomers are suitable as binders to be applied to these fiber aggregates, such as polyurethane,
There are SBR, NBR1 polyacrylic acid esters, etc. Among them, polyurethane elastomer is the most preferred in terms of ease of binder processing, softness, and durability.

The filling method and filling amount of the binder in the fiber aggregate (A) are the same as in the normal case, and there is no problem, but in this case as well, the child fiber aggregate is treated with polyvinyl alcohol before filling with the binder. To make the bond between the fiber and binder as non-adhesive as possible, such as by applying
This is desirable from the viewpoint of the flexibility and softness of the resulting base material and, ultimately, of the sheet-like material.

The leather-like sheet material of the present invention is a leather-like sheet material formed by laminating a polyurethane elastomer dry film on a base material as described above, in which the dry film is laminated with a specific undercoat layer as described above and a top layer. It is characterized in that it is composed of a coat layer.

Here, the undercoat layer is composed of a polyurethane elastomer obtained using a polyol containing only 20 to 50% by weight of polyethylene glycol as a polyol component, and mainly contributes to improving the moisture permeability of the sheet material. The layer is also composed of a polyurethane elastomer obtained using a polyol containing 5 to 18% by weight of polyethylene glycol as a polyol component, and mainly imparts a preferable dry-touch feel, water resistance, and heat resistance to the surface of the sheet material. Particularly helpful.

When such specific polyurethane elastomers are used in combination, a W /eA which is generally difficult to achieve not only with conventional dry-processing artificial leathers but also with wet-processing artificial leathers;
High moisture permeability of hr or more (JIS-
According to the method of 6549), it is easy to obtain a sheet-like article with favorable surface properties, and the present invention provides such a sheet-like article with high moisture permeability and excellent surface properties. be.

Among the combinations of polyurethane elastomers mentioned above, for example, if the elastomer in the top coat layer is replaced with another general polyurethane elastomer for surface finishing, a sheet form with extremely low moisture permeability may be obtained although the surface physical properties may be somewhat satisfactory. However, the object of the present invention cannot be achieved.

It is important that the weight fraction of polyethylene glycol in the polyol component of the polyurethane elastomer constituting the undercoat layer of the dry film in the leather-like sheet material of the present invention is within the range of 20 to 50%. be. When the weight fraction is less than 20%, the moisture permeability decreases;
%, the amount of water adsorption becomes too large, resulting in insufficient dimensional stability and poor adhesion to the base material.

Any polyol component other than polyethylene glycol can be used in the polyurethane elastomer (A). For example, polyester types such as polyethylene adipate, polybutylene adipate, polyhexamethylene adipate, and copolymers thereof, polylactone such as polycaprolactone, polyether types such as polypropylene glycol ether, polytetramethylene ether glycol, and special esters. Polybutylene carbonate, polyhexamethylene carbonate, etc. are used alone or as a copolymer.

Among these, from the viewpoint of weather resistance, hydrolysis resistance, flexibility, etc. of the elastomer film, it is desirable to use polyether type or polycarbonate type, and polycarbonate type is particularly preferred.

20 to 50% by weight of the polyethylene glycol mentioned above
The average molecular weight of the polyol contained is suitably 500 to 3,000, more preferably L D 00 to 2, OOO
It is. The molecular weight of each of these mixed polyols 6 may be the same or different, and when the molecular weight is the above-mentioned average, a polyurethane coating film with good elasticity and high moisture permeability can be obtained.

The organic diisocyanates used here include aromatic diisocyanates such as tolylene diisocyanate) 'N'a' diphenylmethane diisocyanate, 1,
Typical examples include aliphatic and alicyclic diisocyanates such as 6-hexamethylene diisocyanate and isophorone diisocyanate, but of course, any organic diisocyanate commonly used in conventional polyurethane elastomers can be used. Available.

There are no particular restrictions on the chain extender, and examples include glycols such as ethylene glycol, butylene glycol, and hexane glycol, hydrazine, ethylenediamine, 1,2-propylenediamine, hexamethylenediamine, tolylenediamine, and 4,4'diaminodiphenyl. Diamines such as methane, amino alcohol compounds, etc. are used.

Regarding the polymerization of polyurethane elastomer (1), conventional methods can be applied as is.

That is, either bulk polymerization or solution polymerization may be used,
For film formation of polyurethane elastomer by a dry method, it is more preferable to use a solution polymerization method. The reaction method with the diisocyanate may be either a prepolymer method or a one-shot method, but it is preferable to use a solution polymerization method, especially a solution polymerization method that uses a solvent with a relatively low point, which is advantageous for dry film formation. The prepolymer method is suitable for this purpose.

When carrying out solution polymerization, suitable solvents include methyl ethyl ketone, dioxane, tetrahydrofuran, isopropyl alcohol, toluene, and anone, which have good drying properties and have a low to medium boiling point. Of course, N,N dimethylformamide and dimethyl sulfur are preferred.

The polyurethane elastomer used for the top coat layer has a polyol composition, organic diisocyanate, There is no problem as long as the chain extender, polymerization mode, polymerization solvent, etc. are the same.

If the weight fraction of polyethylene glycol in the polyol component of the polyurethane elastomer (B) is less than 5%, high moisture permeability cannot be achieved.On the other hand, if it exceeds 18%, the surface tack becomes strong and dry touch occurs. Difficulties arise in sexuality.

For use in the above-mentioned polyurethane elastomer binder coat layer constituting a two-layer dry coating layer in the leather-like sheet material of the present invention. Hereinafter, it may be simply indicated as ■] and polyurethane elastomer ■ [Top coat calendar month. The coating amount of
Is the total amount of B) applied 20 to 709/fl? , more preferably in the range of 50 to 507/vl, and it is particularly desirable that the relative coating weight ratio of ■ and (A) satisfies the range of 2.0:1 to 35:1; When this is done, it is possible to obtain a sheet-like product which has particularly high moisture permeability (4 q/cd 4 hr or more is easily achieved), and has excellent surface texture, texture, durability, etc. ■、(B
), the water pressure resistance of the sheet-like material tends to be insufficient;
When the amount exceeds 01/d, the texture becomes extremely rough and hard. In addition, even if the total coating amount is within the range of 20 to 70 l/d,
If the coating amount of the undercoat layer is less than 2.0 times that of the topcoat layer, high moisture permeability cannot be maintained, and
Flexibility becomes insufficient and bones develop, and for unknown reasons, water pressure resistance also tends to decrease, which is undesirable.On the other hand, if the ■/@ ratio exceeds 3.5, it is not desirable to It is observed that not only the surface feel to the touch is not good (but also the physical properties of the top coat layer, such as scratch resistance, etc.) are satisfactory.

The above-mentioned dry film layer can be formed on the surface of the base material by directly applying and drying an elastomer solution such as knife coating, roll coating, or gravure coating, or after forming a separate dry film on release paper. There are methods of laminating this on a base material, but among these, the gravure coating method is the best in that it can form a uniform and thin dry film, and it can be used as both a top coat layer and an undercoat layer. It is also suitable for use.

When using the gravure coating method, a gravure roll of usually 60 to 200 meshes, more preferably 100 to 150 meshes is used, and a coating solution containing a polyurethane elastomer (2) is first applied to the surface of the base material until the coating amount of the elastomer reaches the above-mentioned desired amount. After coating and drying to form an undercoat layer, apply a coating solution containing polyurethane elastomer ■ to the desired coating amount using the same gravure roll as above. 9
Bye. In this case, the elastomer solid content concentration in the coating solution is generally 10 to 60% by weight, more preferably 15 to 60% by weight, regardless of whether it is for undercoat or topcoat.
It is adjusted to a range of 25% by weight. Also, its viscosity is 500
~2,0OOCps (60°C) is preferred.

In addition, when using a method such as a knife coating method in which a relatively large amount of coating liquid is applied to the surface of the base material at once, it is necessary to prevent deterioration in texture due to penetration of (A) into the base material of the coating liquid. Therefore, the solid content concentration of the coating solution was increased, and the solution viscosity was 5.0.
It is desirable to set the temperature to about 00 to 20,000 cps (30°C).

The leather-like sheet material of the present invention may be textured (embossed) or colored using a hot roll, if necessary. Embossing is performed in a state where there is no direct contact between the surface of the undercoat layer and a hot roll, for example, after gravure coating the topcoat layer component [polyurethane elastomer 0] at least once on the undercoat layer. . If the undercoat layer is directly embossed with a hot roll, a burn-in phenomenon will occur, and a sheet-like product with a good appearance cannot be obtained.

The sheet material can be colored by adding a desired coloring agent to either or both of the undercoat layer and the topcoat layer. A preferred embodiment is that only the undercoat layer is colored and the topcoat layer is uncolored so that it can function as a so-called clear layer.

In this way, a sheet-like product with a deep color tone and a desirable appearance can be obtained.

The leather-like sheet material of the present invention has a dry film layer (grain layer) comprising a layer (undercoat layer) of a flexible and highly moisture permeable polyurethane elastomer (B) made of a specific polyol composition, and a layer (undercoat layer) made of a specific polyol composition. It is composed of a layer (top coat layer) of polyurethane elastomer (A) which has a composition and exhibits a preferable surface feel of dry touch.Moreover, by combining the specific polyurethane elastomers, the presence of the top coat layer also makes it possible to create an undercoat layer. The high moisture permeability of the layer is not significantly impaired, and the adhesion between the undercoat layer and the top coat layer is also good, and the overall appearance and surface feel are excellent while maintaining high moisture permeability. It has good texture (softness) and durability. Also,
Since the top coat layer has excellent water resistance, the water pressure resistance is maintained at a practically sufficient level, and combined with its high moisture permeability, it is suitable for use in Chinese products, etc.

Furthermore, because the grain layer is thin, it is lighter than artificial leather with a wet grain surface, and is superior in terms of functionality and durability, and is also advantageous from a cost standpoint. .

Regarding the silver surface of artificial leather, it is generally better to design the undercoat layer to be somewhat soft and have a relatively low softening point, while the totsubu coat layer to be hard and have a high softening point. It is said that the characteristics of artificial leather are well-balanced, but in the case of the sheet-like product of the present invention, by specifying the polyol composition of the polyurethane elastomer for the silver surface as described above,
The above conditions are naturally satisfied regardless of the other elastomer components, and this point is also one of the features of the present invention.

Next, the present invention will be explained in more detail with reference to Examples.

In addition, parts and % regarding concentration in the examples represent parts by weight and % by weight, respectively. In addition, the physical properties of the sheet-like materials shown in each Example were evaluated by the following method.

1. Moisture permeability Measured according to the method specified in JIS-6549 2. Water resistance measured according to the method specified in JIS-L-1079,
1,000mH2O or more O (pass), 500~+, o
oo絽H20 was rated as △ (very good), and 500111H20 or less was rated as × (fail).

3. Dry touch property (surface feel) The feel of the grain side of the sample was evaluated by five specialized inspectors, and those with a surface feel of 4 Å or more that was close to calf natural leather were given a rating of ○ (pass), 2~ The case of 6 people was rated △ (fairly good), and the others were rated × (failed).

4. Boiling test The test piece (a ○ (pass), extreme (slight change is recognized as △ (good)
Those in which the top coat layer fell off or partially peeled off were rated x (fail).

Example 1 (1) Production of solution for polyurethane elastomer for undercoat Polytetramethylene glycol (molecules i1,5oo) 6
5 parts, polyethylene glycol (molecular weight 1. o o
o) 35 parts of the mixture was heated to 80° C. and dehydrated under reduced pressure in a nitrogen stream for 1 hour. While cooling the mixture to 40°C, 59 parts of 4,4' diphenylmethane diisocyanate was added with stirring, followed by reaction at 70°C for 120 minutes to prepare a prepolymer.

Next, 680 parts of a mixed solvent of tetrahydrofuran:dioxane = 1:1 was added to uniformly dissolve the prepolymer, and 14 parts of 1,4-butylene glycol was added thereto for chain elongation at 80°C for 180 minutes. After continuing the reaction, 12 parts of ethanol was added to stop the reaction. (The molar ratio of polyol:diisocyanate:chain extender is 1:3:2.

) The solid content concentration of the polyurethane elastomer (A) solution for undercoat obtained here was 25.0%, and the viscosity was 1.800 cps/30°C. Also,
The weight fraction of polyethylene glycol in the polyol was 35%.

(2) Polyurethane elastomer for top coat ■Production of solution Other than setting the weight fraction of polyethylene glycol (hereinafter abbreviated as PEG) in the polyol component to 1%, the molar ratio of polyol: diisocyanate: chain extender,
Polymerization was carried out while adjusting the type of reaction solvent, solid content concentration, reaction temperature, time, etc. to be the same as in (1) above to obtain a polyurethane elastomer (A) solution for a top coat.

Its solid content concentration is 24.8%, and its viscosity is 1.500
c p s / 30°C.

(3) Manufacture of sheet-like products 1.0 denier nylon short fiber nonwoven fabric (thickness 2, 2
A base material (thickness 1.2゜, basis weight 400
A solution prepared by mixing carbon black in an amount equivalent to 05% of the solid content of the elastomer with the polyurethane elastomer solution obtained in (1) above was applied to the sliced surface of the elastomer with an apparent density of 0.33. An undercoat layer was formed by coating 8 times using a gravure coating method using an Egravure roll. Next, on top of that, the polyurethane elastomer solution for the top coat obtained in (2) above,
Coating was carried out six times using the same 100 mesh gravure roll to obtain the desired sheet-like product.

A sample was taken at an intermediate stage in the gravure coating process and the undercoat and top coat amounts were measured using a precision gravimetric method.The results showed that the undercoat component was coated with 0Flrd, which was very large over the entire surface of the base material. It was coated uniformly and beautifully. Also, the top coat component ■ was coated at 11 F/F7/[■/@ ratio = 2.7
1 This final finished product had a soft texture, and the appearance and feel closely resembled that of natural leather with small wrinkles.

Table 1 shows the physical properties of the leather-like sheet material of the present invention obtained here.

For comparison, Table 1 also lists the physical property values of the sheet-like products of each comparative example manufactured as follows.

Comparative Example 1: On the same base material as above, a polyurethane elastomer solution for the undercoat of (1) (carbon black mixture ω equivalent to 0.5% by weight of the elastomer solid content) was applied using a 100 messier gravure roll. Sheet-like material obtained by coating ゛C 10 times (coating amount 35y)
/go).

Comparative Example 2: A sheet-like product obtained by coating the same base material as above with the polyurethane elastomer ■ solution for the top coat of (2) 5 times using a 100 mesh gravure roll (coating amount + ay /m').

Comparative Example 3: A sheet material obtained in the same manner as Comparative Example 2 except that the coating was repeated 10 times (coating amount: 55 y/g).

Comparative Example 4: In place of the top coat polyurethane elastomer ■ solution in (2), 1,4 butylene gelicol adipate (molecular weight 600), 4,4' diphenylmethane diisocyanate and ethylene gelcol were added at a molar ratio of + Sheet-like material obtained in the same manner as in the example of the present invention except that a conventional dry-touch top coating agent reacted at a ratio of 4:3 (solid content coating amount of top coating agent 11y/g) As shown in Table 1, the leather-like sheet material of the present invention has extremely high moisture permeability (even wet-processed artificial leather generally has a moisture permeability of about 6 ■/d·hr at most), and is superior to other artificial leathers. It is also extremely excellent in terms of the physical properties it should possess.

On the other hand, products coated with only polyurethane elastomer (B) for undercoat (Comparative Example 1) or only polyurethane elastomer (B) for top coat (Comparative Example 2.3) have excellent moisture permeability and other physical properties. It is not possible to satisfy these requirements at the same time, and it is impossible to obtain a well-balanced artificial leather. In addition, when a conventional urethane-based top coat agent (Comparative Example 4) was used as a top coat agent instead of polyurethane elastomer (■), the high moisture permeability of the undercoat polyurethane elastomer (A) was impaired. The moisture permeability is as low as that of regular dry-processed artificial leather.

In addition, in the sheet-like material of the present invention and the sheet-like material of Comparative Example 1,
Furthermore, kid-like embossing (150℃ x 3 se
c, 30vf/m), the sheet-like material of the present invention exhibited a natural leather-like appearance with excellent three-dimensional effect;
On the other hand, the sheet-like material of Comparative Example 1 caused a burn-in phenomenon and was difficult to embossing.

Example 2 In addition to setting the weight fraction of PEG in the polyol component as shown in Table 2, the types of polyol, diisocyanate, chain extender, their molar ratios, reaction solvent, reaction temperature, elastomer solid content concentration, etc. A polymerization reaction was carried out under the same settings as in Example 1-(1) to obtain solutions of seven types of polyurethane elastomers having different PEG weight fractions.

All of these elastomer solutions had a solid content concentration of 24.
5 to 25.4%, and viscosity of 1.700 to 1.880
It was in the range of cps/30°C.

Example 1-(
Sheet-like products were obtained in exactly the same manner as in 3), and the physical properties of these sheet-like products are shown in Table 2.

As is clear from the results in Table 2, it is important for the polyurethane elastomer for undercoating that the PEG content in the polyol component is in the range of 20 to 50%, more preferably 25 to 50%.

If the weight fraction of PEG is lower than 20%, the moisture permeability will be insufficient, while if it is higher than 50%, the hygroscopicity will be too large and the silver surface will tend to swell and dissolve in the boiling test, making it unpractical as a silver surface. It becomes something.

Example 6 PEG weight fraction in polyol component was 3.5.8°12
, + 6 or 18%, but the same as in the example + - (2
), solutions of six types of polyurethane elastomers with different PEG weight fractions were prepared. Their solids concentration and viscosity were in the range of 24.6-25.6% and 1.400-1.580 cp8/30 °C, respectively.

The polyurethane elastomer solution obtained here and the solution of the polyurethane elastomer with a PEG weight fraction of 20% prepared in Example 2 were used as top coating agents, but the sheets were prepared in the same manner as in Example 1-(3), respectively. A similar product was produced.

The physical properties of these sheet materials are shown in Table 6, and as is clear from the results, the weight fraction of PEG in the polyol component of the polyurethane elastomer for top coat is 5 to 18.
%, more preferably 5 to 16%.

When the PEG weight fraction is lower than 5%, the moisture permeability is no different from that of conventionally used top coat agents, and is insufficient.On the other hand, when it is higher than 18%, it lacks dry touch properties and also fails in the boiling test. Passed.

Example 4 Example 1-(+
) and (2) to obtain a solution for a polyurethane elastomer for an undercoat and a zero solution for a polyurethane elastomer for a topcoat.

The solid content concentration and viscosity of each polyurethane elastomer solution are (A) 24.5% and 1.600 as a solution.
cps/ 30°C, 25.8% as 0 solution, 1.7
00 cps/30°C, and was suitable as a polyurethane elastomer solution for gravure coating.

This elastomer solution was gravure-coated on the surface of the substrate according to Example 1-(3) to obtain a sheet-like product, which was made soft and had a good texture and appearance with small wrinkles. The evaluated physical properties were as follows.

Silver surface thickness 65 microns, to/@ ratio 2.5, moisture permeability &3
mg/cJ, hr1 water pressure resistance, dry touch, and boiling tests all passed.

Example 5 A nonwoven fabric made of 1.5 denier polyethylene terephthalate fiber (thickness: 2.0 denier, Nikkan 300y/27/, apparent density: 15) was impregnated with an ester-type polyurethane elastomer solution and wet coagulated. Base material obtained by slicing (thickness 1.5 words, basis weight 520 f/W
Example +-(
In exactly the same manner as in 3), five types of sheet-like products with a grain layer thickness of about 35 microns (solid content coating amount of about 4 oy/m) and different (Al/(A) ratios) were obtained. The evaluation results are shown in Table 4.

1'51- As shown in Table 4, the moisture permeability is particularly good when the ratio of Since the test results also tend to be poor, it is generally desirable to avoid using 65.

Example 6 Poly 1,6 hexane glycol carbonate glycol (molecule i+, 000) and PEG as polyol components
(molecular weight too), and the weight fraction of PEG is 3
Using polyol mixtures that are 0% or 12%, the molar ratio of polyol:diisocyanate:chain extender is j:
A polyurethane elastomer solution was prepared in the same manner as in Example 1-(+) except that the ratio was 3.5:2.5 and a 1:1 mixture of toluene and isopropanol was used as the polymerization solvent.

Next, the obtained PEG with a weight fraction of 60% (solid content concentration 24.8%, viscosity 1.900 cps/30°C
) as an undercoat component, and the same 12% (solid content concentration 25.6%, viscosity 1,600 cps/
50°C) as a top coat component,
A sheet-like product was produced in the same manner as in Example 1-(3) except for the above.

The moisture permeability of this sheet-like material is 68η/cd, hr
All other evaluation performances were also passed. In addition, the appearance of small wrinkles on the surface was similar to that of natural leather, and the appearance was also favorable.

Example 7 The polyurethane elastomer solution for top coat obtained in Example 1-(2) was coated on polypropylene-treated calf-like textured release paper and dried to a thickness of 1.
A 2 micron film is formed, and the same
The polyurethane elastomer 0 solution for undercoat obtained in Example 1-(1) was coated so that the average thickness after drying was 25 microns and dried [(A)/
■Ratio -2,3].

Separately, an isocyanate crosslinking agent of 5y/Pd was applied to the base material obtained in Example 1-G), and the above dry film was laminated thereon, and after drying and airing, the release paper was peeled off. A sheet-like product was obtained.

The sheet-like material obtained here has a wrinkle feeling similar to that of natural leather, and a moisture permeability of 6.57 Iv/cJ, hr.
It passed the water pressure resistance, dry touch property, and boiling test.

Example 8 A single-sided raised fabric of polyester/cotton twill fabric dated '55097td was impregnated with an ester-type polyurethane elastomer solution so that the weight ratio of fiber to facial elastomer was 65:65, wet coagulation, and drying. A sheet-like product was obtained in exactly the same manner as in Example 1-G), except that the impregnated woven fabric was used as a base material and a dry film was formed on the non-raised surface of the base material.

Its moisture permeability was very excellent at Z2q/hr, CD, and all other evaluation performances passed.

= 35- In addition, the surface had a wrinkled appearance similar to natural leather.

Claims (3)

[Claims] (1) A leather-like sheet material formed by laminating a dry film of a polyurethane elastomer on a base material, the dry film comprising an undercoat layer made of the polyurethane elastomer of (A) below, and a polyurethane elastomer of (B). A highly moisture permeable leather-like sheet-like material comprising a top coat layer consisting of: (A) A polyurethane elastomer in which 20 to 50% by weight of its polyol component is polyethylene glycol (B) A polyurethane elastomer in which 5 to 18% by weight of its polyol component is polyethylene glycol (2) The highly moisture permeable leather-like sheet material according to claim 1, which has a moisture permeability of at least 4 mg/cm^2. (3) The total weight of the undercoat layer and topcoat layer is in the range of 20 to 70 g/m^2 in terms of elastomer weight, and the weight ratio of both layers is the same in terms of elastomer weight ratio of 2:1 to 3.5. The highly moisture permeable leather-like sheet material according to claim 1 or 2, which has a range of: 1.