JPH0777789B2 - Leather grip cover - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a leather-like grip cover, and more particularly to improvement of a skin layer thereof, and relates to an interior material for an automobile such as a steering wheel (handle) cover; various rackets and golf. Exercise equipment such as clubs; can be used for grips such as shoes.

[Background technology]

For a portion such as an automobile handle that a person holds with a bare hand for a long time, it is required to have good fit with the skin and an appropriate fit.

From such a point of view, in JP-A-1-61580, a skin layer made of a urethane resin is provided on a base material made of an olefin resin foam via an intermediate layer made of a vinyl chloride resin foam. An example of a synthetic leather suitable as a handle cover is proposed, and Japanese Utility Model Laid-Open No. 1-173071 proposes a handle cover in which a skin layer made of a leather powder-added resin is provided on a base material.

[Problems to be Solved by the Invention] However, in the case of the clip cover using the synthetic leather whose outer skin layer is made of resin like the former, when it is gripped for a long time, it sweats and the contact surface Has the drawback that it becomes slippery and slippery.

Also, in the case of the grip cover in which leather powder is added to the skin layer like the latter, since it absorbs sweat well, there is no such drawback, but there is a drawback that white powder bleeds in the skin layer after long-term use. is there.

An object of the present invention is to add a specific property of skin powder to a resin skin layer, so that even if the grip portion is held for a long time with bare hands, it does not slip due to sweat, and even in long-term use. It is an object of the present invention to provide a leather-like grip cover that does not cause bleeding of white powder and can maintain stable performance for a long period of time.

[Means and Actions for Solving the Problems]

The leather-like grip cover of the present invention basically comprises a base material having a cortical content of 85 wt% or more, an oil and fat content of 2 wt% or less, and a total amount of water-extractable Na ⁺ ions and Ca 2 ⁺ ions. ₅ to 60% by weight of leather powder and synthetic resin having an average particle diameter D ₅₀ of 7 μm or less and a standard deviation of the particle diameter of 3 μm or less
It is composed by laminating a skin layer containing 95 to 40 wt% as a main component.

Materials used for the leather-like grip cover of the present invention will be described.

The leather powder used for the epidermis layer has limited characteristic values such as cortical content as described above, but this is for the following reason.

1) Cortical content 85 wt% or more: A high content of cortical content means that the amount of impurities is small, and at the same time, it is important to improve the surface condition and touch feeling of products mixed with leather and paint. It means to be a factor. That is, the surface state and the like of the product can be efficiently improved with a small amount of powder having a large cortical content.

2) Oil / fat content 2 wt% or less (preferably 0.5 wt% or less): The oil / fat content present in animal leather is deteriorated by heat, etc., and the surface texture deteriorates due to malodor, coloring and bleeding out of the mixed product (greasy, slimy, It causes a feeling of shiny). Therefore, the lower the oil and fat content, the better.

3) Total amount of free ions (Na ⁺ , Ca ²⁺ ) that can be extracted with water.
5 wt% or less: Of the impurities derived from leather raw materials, if the amount of free ions extracted with water is large, it will be affected by humidity, heat, etc. when commercialized, and its salts (eg NaCl, Na ₂ SO ₄ , CaSO ₄
Bleed out, which leads to deterioration of the product appearance.
As free ions that can be extracted with water, in addition to the cations of Na ⁺ and Ca ²⁺ , there are anions of Cl ^- and SO ₄ ^2- , but those that bleed out are those ions. Since it occurs only in the form of the counterion salt, it was defined as the total amount of the small cations Na ⁺ and Ca ²⁺ .

4) Average particle size D ₅₀ ≦ 7 μm and standard deviation δ ≦ 3 μm: The particle size is a decisive factor for thin-walled products. If the particle size is large, defects and surface texture deteriorate due to poor dispersion (roughness, Unevenness). On the other hand, the smaller the particle size is, the better the dispersion is, and the product having a small number of product defects (void, etc.) and the surface condition with a good touch feeling can be obtained. Also, a small standard deviation means that there is little inclusion of large particles in distribution.

The method for measuring the above characteristic values is as follows.

A) Cortical content and oil content: According to JIS K6550-1976 "Leather test method" 6.7 and 6.4.

B) Total amount of free ions (Na ⁺ , Ca ²⁺ ) extractable with water: 10 g of dried leather powder is stirred in 100 ml of pure water for 24 hours to extract the free ions in the leather powder. The amount of Na ⁺ and Ca ²⁺ in the extract is quantified by atomic absorption spectrometry and calculated as the amount extracted from leather powder.

C) Distribution of average particle size and standard deviation: Coulter counter (manufactured by Coulter Electronics Co.) by dispersing dozens of mg of leather powder in 100 ml of methanol
The distribution of particles is measured by and the average particle diameter and standard deviation are obtained.

The density range of the leather powder is usually 0.38 to 0.43 g / cc (measured according to JIS K6721 after drying the leather powder at 120 ° C for 2 hours). If the density is too high, the particle size increases and exceeds the prescribed average particle size of 7 μm. On the other hand, if the density is too low, the leather powder becomes fibrous or the hair fibers come out a lot and the synthetic resin is uniform. It may be difficult to disperse in.

The leather according to the present invention as described above is, for example, roughly crushed with respect to a leather powder raw material, dried, degreased with a solvent, removal of residual solvent,
Washing with water, dehydration, swelling treatment with steam, drying, fine pulverization,
After performing each step of classifying fine powder and coarse powder, the step of re-pulverizing the fine powder to an average particle diameter D ₅₀ = 7 μm or less and, if necessary, from the fine powder having D ₅₀ = 7 μm or less D ₅₀
It can be manufactured by performing a step of classifying and removing fine powder having a particle size of 2 μm or less.

This manufacturing method will be described in more detail. First, in order to facilitate the fine pulverization in the subsequent step, the leather powder raw material is coarsely pulverized to a particle size of about 10 mm or less with a coarse crusher such as a show crusher, a cutter mill and a hammer crusher. The coarsely crushed leather powder thus obtained usually contains 40 to 60 wt% of water. As the raw material for the leather powder, shaving waste leather, leather or the like can be used.

Next, in order to facilitate the degreasing (removal of oils and fats) in the subsequent process, the water-containing coarse powder is added until the water content becomes about 20 to 30 wt%.
dry.

Next, this dry crude powder was mixed with a suitable solvent to obtain a fat and oil content of 2 wt.
%, Preferably degreasing to 0.5 wt% or less.
Here, n-hexane, benzine, methylene chloride, acetone, ethyl acetate, toluene and the like can be used as the degreasing solvent.

Subsequently, in order to remove the residual solvent in the coarse powder, the coarse powder after degreasing is heat-treated. Since steam is usually used as a heat source for safety reasons, this process is also called steam purge. As other heat source, heated nitrogen, heated air, etc. can be used.

Next, extract mainly free ions (Na ⁺ , Ca ²⁺ ) in leather,
A water washing process and a dehydration process are performed in order to retain the predetermined water content in the coarse powder while removing it. It is effective to repeat this series of water washing operations several times in a batch system.For example, a certain amount of water is supplied to the crude powder after solvent removal, and after stirring for a desired time and bubbling with air if necessary, dehydration is performed. The method is usually repeated several times, preferably 3 to 4 times, depending on the amount of water supplied. The continuous washing operation uses a large amount of water and is not advantageous, but it is possible. Dehydration is usually
Although filtration (draining or draining) is carried out from the viewpoint of ease of operation, it may be carried out by another method such as centrifugal dehydration.

The water temperature may be room temperature, preferably 30 ° C or lower.

Free Na ⁺ ions and C
A water-containing coarse powder having a total amount of 0.5% by weight or less of a2 ⁺ ions (converted to dry weight) and a water content of 65 to 70% is usually obtained. This series of water washing operations will eventually cause the coarse powder to normally retain a certain amount of water (65-70%), so this method is conventionally performed only by confirming the water content of the coarse powder after dehydration. As described above, there is an advantage that the humidity control step of replenishing water until the coarse powder after removing the solvent has a predetermined water content can be virtually eliminated.

Here, the reason why the predetermined amount of water is retained or supplied to the coarse powder is as follows. That is, in the dry state, even if finely pulverized after steam steaming in the next step, pulverization does not proceed. However, when steam-steamed coarse powder containing water and thus swollen, it is partially heat-denatured, and when it is dried, it becomes tight and hard, and is easily ground and pulverized.

Next, in order to facilitate the fine pulverization in the subsequent step, the crushed leather powder after dehydration is subjected to a swelling treatment (steam steaming) with steam while stirring.

Subsequently, in order to facilitate the fine pulverization in the subsequent step, the coarsely crushed leather powder after the swelling treatment is dried until the water content becomes about 3 wt% or less. This drying step is usually performed by combining preliminary drying with a dryer and main drying after vacuum drying.

Next, in order to facilitate re-fine pulverization in the subsequent step, after the roughly crushed leather after drying, the Victory mill, ball mill, colloid mill,
Finely pulverize with a dry pulverizer such as a jet mill, roller mill or hammer mill until the average particle size reaches approximately 50 μm.

Then, for the same reason, the finely pulverized leather powder obtained is subjected to gravity classification, inertial classification, centrifugal classification such as cyclone and micron separator, and fine powder (for example, average particle size D ₅₀ = Classify into coarse powder (for example, D ₅₀ = 60 μm or more) and coarse powder (thickness of 30 μm or less) The coarse powder can be circulated to the fine pulverization step as needed.

Subsequently, the fine powder is re-pulverized until D ₅₀ = 7 μm or less. Further, if necessary, a step of classifying and removing the fine powder having D ₅₀ = 2 μm or less from the fine powder having D ₅₀ = 7 μm or less may be performed. The re-fine pulverization step can be carried out by a pulverizer suitable for pulverization, such as a jet mill or a colloid mill, among the dry pulverizers described above. The classifying step can be carried out by the classifier as described above.

In the above method, a series of washing operations were performed after the degreasing step, but this washing operation can be performed before degreasing or after pulverization.

The synthetic resin used in combination with the leather powder obtained as described above may be thermoplastic or thermosetting. Representative thermoplastic resins include vinyl chloride resin, vinyl acetate resin, polystyrene, ABS resin, acrylic resin, polyethylene, polypropylene, fluororesin, polyamide resin, acetal resin, polycarbonate, urethane-based, ester-based thermoplastic elastomer, and the like. There are cellulosic plastics and the like. Typical thermosetting resins include phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, diallyl phthalate resin, thermosetting polyurethane resin, and silicone resin. Of these, vinyl chloride resin and polyurethane resin are preferable.

The composition for forming a skin layer according to the present invention includes additives commonly used in this field, such as an antioxidant and an ultraviolet absorber, and a plasticizer, depending on the purpose such as stabilization of quality and the use environment. , Stabilizers, lubricants and other processability improving agents; fillers; dyes,
A required amount of a coloring agent such as a pigment can be added.

Antioxidants include alkylphenol, alkylene
Bisphenol, alkylphenol thioether,
There are β, β′-thiopropionic acid ester, organic phosphite ester, aromatic amine, phenol-nickel complex and the like.

As a UV absorber, salicylate such as phenyl salicylate; benzotriazole such as 2-hydroxyphenylbenzotriazole; 2-hydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoctane There are hydroxybenzophenone compounds such as xybenzophenone and 2,2'-dihydroxy-4-methoxybenzophenone.

Processability improvers include plasticizers such as dioctyl phthalate, dibutyl phthalate, tricresyl phosphate, trioctyl phosphate for vinyl chloride, tribasic lead sulfate, lead stearate, and dibasic lead phosphite. There are stabilizers such as, and lubricants such as stearic acid, lead stearate, and carnauba wax. For polyurethane, dimethylformamide,
There are solvents such as methyl ethyl ketone and isopropyl alcohol.

Fillers include calcium carbonate, white titanium, clay, mica and the like.

Examples of the base material include woven fabric, knitted fabric or non-woven fabric made of natural or chemical fibers; polyurethane resin, or non-woven fabric impregnated with polyurethane resin and leather powder. In particular, when a non-woven fabric impregnated with a polyurethane resin is used, artificial leather, that is, natural leather-like properties and structure can be obtained. Further, when a non-woven fabric impregnated with a polyurethane resin together with leather powder is used as a substrate, artificial leather containing leather powder can be obtained not only in the substrate but also in the surface layer and the fine porous resin intermediate layer as described later. Not only that, the hygroscopicity can be improved as compared with the synthetic leather type using woven or knitted fabric as a base material.

Next, a method for manufacturing the leather-like grip cover of the present invention will be described.

This leather-like grip cover is manufactured by laminating a skin layer on a substrate in principle.

As the lamination method, for example, when a polyurethane resin is used, a method of impregnating a leather powder-containing resin solution on a substrate, a wet method of applying the solution to a substrate, or a leather powder-containing film or sheet with the solution or the like is used. There is a dry method in which it is prepared and laminated on a substrate directly or via an adhesive. Further, for example, in the case of polyvinyl chloride resin, a method of producing a film or sheet by extrusion molding or calender molding of a leather powder-containing heat-melting resin, and laminating the film or sheet on a base material to which an adhesive has been applied in advance and dried has been mentioned. .

In any case, when a pellet-shaped, powder-shaped, block-shaped, or paste-shaped resin is used as the synthetic resin, the moisture content of the leather powder is 0.5 wt in order to prevent foaming and hydrolysis of the powder during heating mixing or kneading in advance. % Or less, and the dried leather powder, the resin and, if necessary, an additive are mixed or kneaded under heating, and processed into, for example, a pellet shape, a powder shape or the like, and then formed into a film or sheet shape. When a solution is used, the resin is dissolved or dispersed in a suitable solvent, the leather powder and additives, if necessary, are added thereto, and the mixture is stirred and mixed, and then formed into a film or sheet. In either case, the mixing ratio of leather powder and synthetic resin is 10 to 99 wt% of synthetic resin.
On the other hand, the leather powder is in the range of 90 to 1 wt%. If the proportion of leather powder exceeds 90% by weight, the film or sheet becomes brittle, and if it is less than 1% by weight, its effect is not obtained. However, the content of leather powder in synthetic resin is 5 to 50 wt% in the case of film.
Is preferable, and in the case of a sheet, 10 to 60 wt% is preferable.

The thickness of the film or sheet as the skin layer formed by kneading is preferably 5 μm or more, and the leather powder is preferably uniformly dispersed. Further, the leather powder may be exposed on the surface, and in this case, it is useful for improving touch feeling and temperature.

As the molding method, dry film formation, wet film formation, calender molding, inflation molding, T-die molding, press molding and the like can be used.

A specific laminating apparatus used in the above manufacturing method is shown in FIGS.

FIG. 1 shows a dry coating liquid 2 consisting of a leather powder-containing resin solution on a release paper 1 of a dry coating device, which is applied to a desired thickness by a knife roll 3 and dried in a drier 4 and then a cooling roll 5 The film is cooled by means of a film or sheet containing leather powder as a skin layer. Then, after the adhesive 6 is applied to the surface of this film or sheet,
In the nip roll 8, the substrate 7 (which may be impregnated or non-impregnated) separately supplied is laminated, dried in a dryer 9, and further cooled by a cooling roll 10 to be separated from the post-release paper 1. It becomes a laminated body 11. The dry coating liquid 2 forms a skin layer, and is produced, for example, by adding a plasticizer, a leather powder, a stabilizer, an auxiliary agent and the like to polyurethane resin.

FIG. 2 shows an impregnating coating apparatus, in which the impregnating base material 20 is introduced into the impregnating tank 21, where the impregnating coating liquid 22 consisting of the leather powder-containing solution is impregnated, and then the excess is provided by the mangle (squeeze roller) 23. After the liquid is squeezed, it is introduced into the coagulation / washing tank 24, where it is coagulated with water 25, washed with water, and further dried by a dryer 26 to form a laminate 27.

FIG. 3 shows a wet coating apparatus similar to the apparatus shown in FIG. 2, in which the base material 30 is coated with the wet coating liquid 32 including the leather powder-containing solution by the coating roll 31, and then the coagulation / washing tank 33, 34, 35 is used. Are sequentially introduced into a laminated body 40, coagulated with water 36, 37, 38, washed with water, and further dried by a dryer 39 to form a laminated body 40.

Since the laminated body thus obtained contains leather powder in at least the skin layer, it has a good feel as a grip material from the viewpoint of moisture absorption and release and unevenness.

Further, in the present invention, the skin layer can be made microporous, or a microporous resin intermediate layer can be provided between the substrate and the skin layer.

In order to make the skin layer finely porous, to the mixture or solution for forming the skin layer, an inorganic substance such as a water-soluble polymer substance or salt or an organic substance fine powder such as sugar is added in advance, and this is used as a base material as described above. After forming a film or sheet on the inside or on the substrate, it may be washed with water or hot water to dissolve and remove the polymer substance in the film or sheet, followed by draining and drying. In addition, when utilizing the laminating method involving the water washing step as shown in FIGS. 2 and 3, the step of dissolving and removing the water-soluble polymer substance can be omitted. As the water-soluble polymer substance fine powder, for example, fine powder of water-soluble collagen, starch, gelatin or the like having a particle size of 10 μm or less can be used.

On the other hand, in order to provide the fine porous resin intermediate layer between the base material and the skin layer, the synthetic resin and the water-soluble polymer substance are formed on the non-impregnated base material according to the lamination method as shown in FIGS. 2 and 3. A solution containing fine powder may be applied, washed with water and dried. Note that leather powder can be added to this synthetic resin solution. A polyurethane resin is preferable as the synthetic resin.

The microporous laminate thus obtained, for example, in the case where the skin layer is made microporous, is absorbed by the remaining leather powder after dissolution and removal of the water-soluble polymer substance in the same manner as a normal non-porous laminate. While keeping moisture release and unevenness, it also gives a matt feeling similar to the pores of human skin by making it microporous, but on the other hand, since the entire epidermis layer is made into a microporous shade, it is a non-porous laminate. It is inferior to the body in durability and smoothness.

A representative example of the manufacturing process of the laminate and the microporous laminate according to the present invention obtained as described above is shown in FIG.

That is, the base material to which the wet layer coating is applied if necessary is wet-impregnated. On this base material, a film or sheet formed by kneading leather powder and a synthetic resin is laminated by using a welding agent as necessary, or a water-soluble substance and a solvent are added to the leather powder and the synthetic resin as necessary. Are added to form a mixed solution, and the mixed solution is applied and laminated to form a laminated body. This laminate is washed to finally obtain a fine porous laminate.

〔Example〕

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

Example 1 (artificial leather type) Preparation of leather powder Chunks of chrome-tanned cowhide waste leather (shaving leather) 1200
After disintegrating kg with a crusher (made by Hosokawa Micron) into the shape of the original shaving waste leather (max: 1 cm width x 12 cm length),
It is sent to a crusher (hammer mill made by Odate Co., Ltd .: capacity 600 kg / Hr) in order and made into a crushed leather powder with a particle size of about 10 mm or less. The water content of this coarse powder was 40 to 60 wt%.

Next, put 350 kg of this wet coarsely crushed leather powder in a vacuum dryer,
Dry until the water content is 20 ~ 30wt%. Then, put 270 kg of this dried coarsely crushed leather powder into a degreasing machine, and add n-hexane to 1
Stir for 1 hour and 15 minutes while feeding at 00 / min, extract, degrease, and filter. The residual oil and fat content in the obtained defatted coarse powder was 0.5 wt% or less.

Next, remove the residual solvent in this defatted coarsely crushed leather powder at 130 ° C, 2 kg / cm
Purge with ² G of steam until the odor of the solvent (hexane) disappears.

The degreasing machine is supplemented with 2 m ³ of room temperature water, stirred for 30 minutes, and then drained by filtration. This batch washing operation is carried out four times in total to remove free ions such as metal ions and water-soluble components in the scrap leather. The coarsely crushed leather powder after filtration and draining contained 65 to 70 wt% of water.

Next, this is transferred to a steam steamer without humidity control, and steamed with steam at 130 ° C. and 2 kg / cm ² G for 45 minutes while stirring.

Next, the steamed coarsely crushed leather powder is pre-dried for 3 hours with a dryer held at 90 ° C until the water content becomes 30-40wt%, and then dried at 45 ° C for 8 hours with a vacuum dryer to obtain a water content of 1wt%. 190 kg of the following dried coarsely crushed leather powder is obtained.

Next, this is finely pulverized for 2 hours at 1700 rpm with a fine Victory mill (manufactured by Hosokawa Micron).

Subsequently, this was classified with a cyclone classifier, and the average particle size was
35 kg of fine leather powder with D ₅₀ = about 30 μm and 155 kg of coarse leather powder with D ₅₀ = about 60 μm are obtained. The coarse leather powder having D ₅₀ = about 60 μm was circulated in the fine grinding step.

In addition, 35 kg of this D ₅₀ = about 30 μm leather powder is jet-milled (made by Seishin Enterprise Co., Ltd.) to obtain air pressure of 8 kg / cm ² G and air volume of 10
Re-pulverize under conditions of m ³ / min and throughput of 20 kg / Hr until the total amount becomes D ₅₀ ≦ 7 μm.

Finally, this was classified with a cyclone (manufactured by Seishin Enterprise Co., Ltd.) to obtain 33.25 kg of ultrafine leather powder with D ₅₀ ≦ 7 μm and D ₅₀ = 20 μm.
Obtain 1.75 kg of ultrafine leather powder (in bag filter) of m or less.

Manufacture of leather powder-containing film: The properties of the ultrafine leather powder having D ₅₀ ≦ 7 μm (hereinafter referred to as leather powder A) thus obtained are shown in Table 1 below.

Manufacture of leather-like grip cover 20% by weight of leather powder A in polyurethane resin solution (80 wt% in solid content; solvent is an equal mixture of dimethylformamide and ethyl methyl ketone, the same applies below) (based on solid content, the same applies below)
It was added and the leather powder containing solution, as a solid content 30 wt% by using an impregnation coating apparatus of FIG. 2, 2 denier, 70 g / m ² after 30 g / m ² impregnated with polyester nonwoven fabric, coagulated and washed with water And dried to make the substrate.

Next, a polyurethane resin solution containing 30 wt% of leather powder A was applied to this base material using the wet coating apparatus shown in FIG. 3, followed by coagulation / water washing and drying, and 200 μm thick containing 30 wt% of leather powder A. The microporous polyurethane resin layer of was formed.

Next, using the dry coating apparatus shown in FIG. 1, a polyurethane resin solution containing 30% by weight of leather powder A is applied onto release paper and dried to prepare a 30 μm thick leather powder-containing polyurethane resin film. Adhere to the microporous resin layer surface of the base material with a urethane adhesive to a thickness of about 10 μm, and stack
A leather-like grip cover laminate having a microporous resin layer was produced.

The structure of the leather-like grip cover laminate of Example 1 is shown in FIG.

In FIG. 5, reference numeral 51 is a polyurethane resin-impregnated non-woven fabric as a base material, and a fine porous polyurethane resin layer 52 is formed on this non-woven fabric 51, and the polyurethane resin is bonded to the micro porous polyurethane resin layer 52 with an adhesive 53. Layers 54 are stacked. Nonwoven fabric 51, microporous polyurethane resin layer 52
Each of the polyurethane resin layer 54 and the polyurethane resin layer 54 contains a predetermined amount of leather powder A.

Example 2 (dry synthetic leather type) A polyurethane resin solution containing 20% by weight of leather powder A was applied onto release paper using the dry coating apparatus shown in FIG.
Dry to make a 100μm thick leather powder-containing polyurethane resin film, and add 30μ denier, 130-140g / m ² nylon tricot base material to the polyurethane resin adhesive for 10μ
A leather-like grip cover laminate was manufactured by adhering and laminating to a thickness of m.

The structure of the leather-like grip cover laminate of Example 2 is shown in FIG.

In FIG. 6, the adhesive material 63 is attached to the nylon tricot base material 61.
Polyurethane resin 64 containing leather powder A is laminated via.

Example 3 (artificial leather type) In the laminating step of Example 1 using the dry coating apparatus shown in FIG. 1, 30% by weight of leather powder A and an average grain size of 6.5 μm were used.
20% by weight of water-soluble collagen particles (molecular weight of about 1,000)
A leather-like grip cover was manufactured in the same manner as in Example 1 except that the polyurethane resin solution containing the same was used, and the leather-like grip cover was immersed in hot water for about 5 minutes for washing and then dried to make the skin layer finely porous. A leather-like grip cover laminate was obtained.

Comparative Example 1 (artificial leather type) In the method for manufacturing the leather powder shown in FIG. 1, the coarsely crushed leather powder after steam purging was directly transferred to a steamer without washing, and the coarse powder had a water content of 65- The same method as in Example 1 was repeated except that water was replenished, the humidity was adjusted to 70 wt%, and then steaming was carried out to produce an ultrafine leather powder with D ₅₀ ≦ 7 μm (hereinafter referred to as leather powder B). . The table below shows the properties of the leather powder B.
Shown in 1.

Hereinafter, according to the same method for producing the leather-like grip cover as in Example 1 except that the leather powder B was used in place of the leather powder A,
A leather-like grip cover laminate was produced.

Comparative Example 2 (Dry Synthetic Leather Type) According to the same method as in Example 2 except that the leather powder B made in Comparative Example 1 is used in place of the leather powder A in Example 2, the leather-like grip cover is manufactured in a leather-like manner. A grip cover laminate was produced.

Comparative Example 3 (Artificial leather type) In Example 1, a leather-like grip cover laminate containing no leather powder was produced according to the method for producing the leather-like grip cover ratio of Example 1 without using the leather powder A.

Comparative Example 4 (Dry Synthetic Leather Type) In Example 2, a leather-like grip cover laminate containing no leather powder was produced according to the method for producing the leather-like grip cover ratio of Example 2 without using the leather powder A. .

Comparative Example 5 Leather powder having a D _{50 of} about 30 μm (hereinafter referred to as Leather Powder C) according to the same method as in Example 1 except that the re-pulverization step and the subsequent classification step were not performed in Example 1. Was manufactured. The properties of the leather powder C are shown in Table 1 below.

Next, in Example 1, this leather powder C was used in place of the leather powder A, and an attempt was made to produce a leather-like grip cover laminate according to the same method for producing a leather-like grip cover as in Example 1. Since the particle size of the powder C was large, it was not possible to impregnate the polyester non-woven fabric with the predetermined leather powder content, so the process was stopped.

Next, with respect to the leather-like grip cover laminate obtained as described above, the feel of the surface, the adhesion of white powder to the hand and the matte tone were evaluated, and the results shown in Table 2 were obtained.

The evaluation method is as follows.

Surface texture: The surface of the laminate (outer skin layer side) is placed outside, and a cylindrical shape with a diameter of 15 mm is obtained. The texture after gripping this with a palm for 15 minutes.

Sweat resistance test: An artificial sweat solution is dropped on the surface of the laminate, and 24 at 30 ° C and 95% RH.
The condition of the surface when exposed to time.

Matte: Evaluated by the appearance of the surface of the laminate and the feel of the hand.

As is clear from this table, the leather-like grip cover laminates of Examples 1 to 3 all have good surface feel,
No change in sweat resistance test, no white powder on hands,
In addition, while the matte tone is also good or excellent, the leather-like grip cover laminates of Comparative Examples 1 and 2 using the leather powder B having a characteristic value different from that of the leather powder A according to the present invention have a sweat resistance test. White powder was generated, and as in Comparative Examples 3 and 4,
The leather-like grip cover laminate containing no leather powder had no change in the sweat resistance test, but the surface feel and matte tone were not good, and in Comparative Example 5, as described above, the predetermined leather was used in the impregnation step. Since the powder content could not be impregnated, further processing became impossible.

〔The invention's effect〕

According to the present invention as described above, even if the grip cover is held with a bare hand for a long time, it does not slip due to perspiration, and bleeding of white powder does not occur even in long-term use, and therefore, over a long period of time. There is an effect that a leather-like grip cover capable of maintaining stable performance can be provided.

[Brief description of drawings]

1 to 3 are schematic configuration diagrams showing a dry coating device, an impregnation coating device, and a wet coating device, respectively, for producing the leather-like grip cover laminate of the present invention, and FIG. 4 is a representative of the laminate. 5A and 5B are sectional views showing the structures of the first and second embodiments, respectively. 1 …… Release paper, 2,22,33 …… Coating liquid or resin solution containing leather powder, 3 …… Knife roll, 4,26,39 …… Dryer, 5,10 …… Cooling roll, 7,20, 30 ... Base material, 11,27,40
...... Laminate, 22 …… Impregnation tank, 24,33,34,35 …… Coagulation and washing tank, 25,36,37,38 …… Water, 51 …… Nonwoven fabric as base material, 52 …… Microporous Polyurethane resin layer, 53,63 …… Adhesive, 54,64 …… Polyurethane resin layer, 61 …… Nylon tricot base material.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B62D 1/04 9142-3D C14B 7/04

Claims (3)

[Claims] 1. Corrosion content of 85 wt% or more and oil content on the base material
Leather having a content of 2 wt% or less, a total amount of water-extractable Na ⁺ ions and Ca 2 ⁺ ions of 0.5 wt% or less, and an average particle size D ₅₀ of 7 μm or less and a standard deviation of the particle size of 3 μm or less. Powder 5
A leather-like grip cover, which is obtained by laminating a skin layer mainly composed of 60 wt% and a synthetic resin of 95 to 40 wt%. 2. The leather-like grip cover according to claim 1, wherein the skin layer is finely porous. 3. The leather-like grip cover according to claim 1, further comprising a fine porous resin intermediate layer laminated between the base material and the skin layer.