JPH0477250A - Leather-like grip cover - Google Patents

Abstract

PURPOSE:To obtain a leather-like grip cover which does not generate bleed of white powder as a result of its long use by laminating a skin layer consisting of a specific amount of leather powder with a specific characteristic and a specific amount of synthetic resin as main components on a base material. CONSTITUTION:A skin layer consisting mainly of 5 to 60 wt% of leather powder having 8 wt% or higher of skin component, 2 wt% or lower of oil/fat, a total of 0.5 wt% of lower of Na<+> ion and Ca<2+> ion which can be extracted in water and a mean grain diameter of D50 of 7mum or less and an average deflection of the mentioned grain diameter of 3mum or less, and 95 to 40 wt% of synthetic resin, is laminated on a base material to obtain a leather-like grip cover. Unwoven cloth impregnated with polyurethane resin 51 consists of a fine porous polyurethane resin layer 52, on which a polyurethane resin layer 54 is laminated through an adhesive 53. The unwoven cloth 51, fine porous polyurethane resin layer 52 and polyurethane resin layer 54 contain a specified amount of leather powder A respectively.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a leather-like grip cover, and particularly relates to the improvement of its surface layer, and is applicable to interior materials for automobiles such as steering link wheel (steering wheel) covers; various rackets; Can be used for exercise equipment such as golf clubs; grips of bags etc.

[Background technology]

For parts such as automobile steering wheels that are held by people or their bare hands for long periods of time, they are required to have good compatibility with the skin and a suitable fit.

From this point of view, Japanese Patent Application Laid-Open No. 1-61580 discloses that a skin layer made of urethane resin is provided on a base material made of olefin resin foam with an intermediate layer made of vinyl chloride resin foam. An example of synthetic leather suitable for a steering wheel cover is proposed in Japanese Utility Model Application No. 1-173071, in which a skin layer made of a resin containing leather powder is provided on a base material.

[Invention or problem to be solved]

However, in the case of a grip cover made of synthetic leather whose skin layer is made of resin, as in the case of the former, the disadvantage is that if you hold it for a long time, you will sweat and the contact surface will become slippery and slippery. There is.

In addition, grip covers with leather powder added to the epidermis like the latter do not have this drawback because they absorb sweat well, but the drawback is that white powder bleeds into the epidermis after long-term use. be.

The purpose of the present invention is to add leather powder with specific properties to the resin skin layer, so that even if the grip part is held with bare hands for a long time, it will not slip due to sweat, and even after long-term use. To provide a leather-like grip cover that does not cause white powder bleed and can therefore maintain stable performance over a long period of time.

[Means and effects for solving the problems] The leather-like grip cover of the present invention basically consists of a base material with a cortical portion of 8
5wt% or more, oil and fat content 2wt% or less, total amount of water-extractable Na+ ions and Ca2+ ions or 0.5wj
♀6 or less, and average particle size. is 7 μm or less and the standard deviation of the particle size is 3 μm or less.
It is constructed by laminating skin layers whose main components are ♀0 and 95 to 40 wt% of synthetic resin.

The materials used for the leather-like grip cover of the present invention will be explained.

The leather powder used for the epidermal layer has limited characteristic values such as cortical content as described above, and this is for the following reasons.

■) Cortex content of 85 wt% or more: A high cortical content means a small amount of impurities, and at the same time it is an important substance that improves the surface condition and touch feeling of products mixed in leather, paint, etc. It means to be a factor. In other words, the surface condition of the product can be efficiently improved by using a larger amount of powder or a smaller amount of powder.

2. Fat and oil content: 2wt% or less (preferably 0.5wt% or less) The oil and fat content present in animal hides deteriorates due to heat, etc., resulting in bad odors, coloring, and deterioration of surface texture due to bleed-out (sticky, slimy, etc.) of the mixed product. It causes a shiny feeling). Therefore, the lower the oil and fat content, the better.

3) Free ions extractable with water (Na”, Ca”)
Total amount of 0.5 wt% or less: Among the impurities derived from leather raw materials, if the amount of free ions extracted with water is large, the product will be affected by humidity, heat, etc., and the salts ( For example, NaC1, Na25
O<, Ca5O<, etc.) bleed out, leading to deterioration of product appearance. In addition to the cations Na'' and Ca''+, free ions that can be extracted with water include CI-
SO, "- anions exist or bleed out only in the form of salts of their counter ions, so the cations N?+ and C are present in small amounts.
It was defined as the total amount with a2+.

4) Average particle size Dso≦7μm and standard deviation σ≦3μm
: Particle size is a decisive factor for thin-walled products; if the particle size is large, it will lead to defects due to poor dispersion and deterioration of surface texture (smooth feel, uneven feel). On the other hand, the smaller the particle size, the better the dispersion, and a product with fewer product defects (such as voids) and a surface condition with a good touch feel can be obtained. Furthermore, a small standard deviation means that there are few large particles mixed in in the distribution.

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

A) Cortex and fat content.

JIS K6550-1976 r Leather Test Method J6.
7 and 6.4.

B) Free ions extractable with water (Na”, Ca”)
Total amount of 10 g of dried leather powder is stirred in 1007 nl of pure water all day and night to extract free ions in the leather powder. Na in the extract
+ Ca2+ is determined by atomic absorption method and determined as the amount extracted from leather powder.

C) Distribution of average particle size and standard deviation.

Several tens of mg of leather powder is dispersed in 1007 nl of methanol, and the particle distribution is measured using a Coulter Counter (manufactured by Coulter Electronics) to determine the average particle size and standard deviation.

Note that the density range of leather powder is usually 0.38 to 0.43 g/
cc (after drying leather powder at 120°C for 2 hours, JIS K
6721). If the density is too large,
If the particle size increases and exceeds the predetermined average particle size of 7 μm,
This is because if the density is too low, it may become leather powder or fibers, or a large amount of fibers may come out, making it difficult to uniformly disperse the synthetic resin.

The leather powder according to the present invention as described above can be produced by, for example, processing the leather powder raw material by coarsely pulverizing, drying, degreasing with a solvent, removing residual solvent, washing with water, dehydration, swelling treatment with steam, drying, finely pulverizing, and converting fine powder into coarse powder. After carrying out each step of classification with the powder, a further step of re-pulverizing the fine powder to an average particle size Dso = 7 μm or less and, if necessary, the step of re-pulverizing the fine powder to the average particle size Dso = 7 μm from the 50-7 powder I)s.

It can be manufactured by performing a step of classifying and removing fine powder of 2 μm or less.

To explain this manufacturing method in more detail, first, in order to facilitate fine pulverization in the subsequent process, the leather powder raw material is coarsely pulverized to a particle size of about 10 mm or less using a pulverizer such as a show crusher cutter mill or a hammer crusher. Crushed leather powder obtained by this method usually contains 40 to 60 wt% of water. Incidentally, as the raw material for the leather powder, shaching waste leather, floor leather, etc. can be used.

Next, in order to facilitate degreasing (removal of fats and oils) in a subsequent step, this water-containing coarse powder is dried until the moisture content is approximately 20 to 30 wt%.

Next, this dry coarse powder is mixed with an appropriate solvent to dissolve 2w of oil and fat.
Degreasing is performed until the content is t% or less, preferably 0.5wt% or less. Here, n-hexane, benzine, methylene chloride, acetone, ethyl acetate, toluene, etc. can be used as the degreasing solvent.

Subsequently, in order to remove residual solvent in the coarse powder, the coarse powder after degreasing is heat treated. For safety reasons, steam is usually used as the heat source, so this process is also called steam purging. Other heat sources that can be used include heated nitrogen and heated air.

Next, free ions (Na”, Ca2
”) is extracted and removed, and a water washing process and a dehydration process are performed in order to retain a certain amount of moisture in the coarse powder.This series of water washing operations can be repeated several times in a batch process or is effective.
For example, a certain amount of water is supplied to the coarse powder after the solvent has been removed, and after stirring for a desired time and bubbling with air if necessary, dehydration is usually carried out several times, preferably several times, depending on the amount of water supplied. Repeat 3 to 4 times. Continuous water washing operation requires a large amount of water and is not advantageous, but it is possible.

Dehydration is usually performed by filtration (draining or draining) for ease of operation, but other methods such as centrifugal dehydration may also be used.

The water temperature may be normal temperature, preferably 30°C or less.

Through the above series of water washing operations, the total amount of free Na'' ions and Ca2+ ions (dry weight equivalent) was reduced to 0.5.
If the amount is less than wt%, a water-containing coarse powder with a water content of usually 65 to 70% can be obtained. As a result of this series of water washing operations, the coarse powder usually retains a predetermined moisture content (65-70%), so this method only requires checking the moisture content of the coarse powder after dehydration, which has not been done in the past. This method has the advantage that the humidity conditioning step of replenishing water until the coarse powder after removing the solvent reaches a predetermined moisture content can be virtually eliminated.

Here, the reason why a predetermined amount of water is retained or supplied to the coarse powder is as follows. That is, in a dry state, even if pulverization is performed after steam steaming in the next step, pulverization will not proceed.

However, when steam-cooked coarse powder that contains water and is swollen, it is partially denatured by heat, and when dried, it becomes compact and hard, making it easier to crush and pulverize.

Next, in order to facilitate fine pulverization in the subsequent process, the coarsely crushed leather powder after dehydration is stirred and then subjected to a swelling treatment (steam cooking) using steam.

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

Next, in order to facilitate re-pulverization in the post-process, the coarsely crushed leather powder after drying is processed using Victory Mill, Holminobecolloid Mill, etc.
Finely pulverize using a dry pulverizer such as a jet mill, roller mill, or hammer mill until the average particle size is approximately 50 μm.

Next, for the same reason, the obtained finely pulverized leather powder is passed through a gravity classifier; an inertial classifier; a centrifugal classifier such as a cyclone or a micron separator; = 30 μm or less) and coarse powder (
For example, the coarse powder can be recycled to the pulverization process as required.

Subsequently, the fine powder was added until D60 = 7 μm or less,
Refine. Furthermore, the above as necessary. -7μm
The following step of classifying and removing fine powders with Dso = 2 μm or less from the fine powders may be performed. The re-pulverization step can be carried out using a jet mill, a colloid mill, or the like that is suitable for pulverization among the dry pulverizers described above. Further, the classification step can be carried out using a classifier as described above.

In the above method, a series of water washing operations were performed after the degreasing step, but this water washing operation can also 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. Typical thermoplastic resins include vinyl chloride resin, vinyl acetate resin, polystyrene, ABS resin, acrylic resin, polyethylene, polypropylene, fluororesin, polyamide resin, acetal resin, polycarbonate, urethane resin, thermoplastic elastomer such as ester resin, There are cellulose plastics, etc. Typical thermosetting resins include phenolic resin, urea resin, melamine resin, unsaturated polystyrene, epoxy resin, diallyl phthalate resin, thermosetting polyurethane resin, and silicone resin.

Among them, vinyl chloride resin and polyurethane resin are preferred.

The composition for forming a skin layer according to the present invention may contain additives commonly used in this field, such as antioxidants and ultraviolet absorbers, depending on the purpose of stabilizing quality and the usage environment. plasticizer,
Processability improvers such as stabilizers and lubricants; fillers: colorants such as dyes and pigments, etc. can be added in necessary amounts.

As antioxidants, alkylphenols, alkylenes,
Bisphenol, alkylphenol thioether,
Examples include β, β'-thiopropionate ester, organic phosphate ester, aromatic amine, and phenol/nickel complex.

As ultraviolet absorbers, salicylic acid esters such as phenyl salicylate; benzotriazoles such as 2-hydroxyphenylbenzotriazole; 2-hydroxybenzophenone, 2hydroxy-4-methoxybenzophenone, 2hydroxy-4-octoxybenzophenone and hydroxybenzophenones such as 2°2'-dihydroxy-4-methoxybenzophenone.

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

Examples of fillers include calcium carbonate, titanium white, clay, and mica.

Examples of the base material include woven fabrics, knitted fabrics, or nonwoven fabrics made of natural or chemical fibers; polyurethane resins, or nonwoven fabrics impregnated with polyurethane resins and leather powder. In particular, when a nonwoven fabric impregnated with polyurethane resin is used, it is possible to obtain characteristics and structure similar to artificial leather, that is, natural leather.

In addition, when a nonwoven fabric impregnated with polyurethane resin and leather powder is used as a base material, it is possible to obtain artificial leather that contains leather powder not only in the base material but also in the skin layer and the microporous resin intermediate layer as described below. In addition, it can improve moisture absorption compared to synthetic leather types based on woven or knitted fabrics.

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

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

For example, when using polyurethane resin, lamination methods include a method of impregnating a base material with a resin solution containing leather powder, a wet method of applying the solution to the base material, or a method of forming a film or sheet containing leather powder with the solution. For example, a dry method may be used in which the substrate is prepared and then laminated onto a base material directly or via an adhesive. For example, in the case of polyvinyl chloride resin, there is a method in which a film or sheet is manufactured by extrusion molding or calendar molding from a heat-melted resin containing leather powder, and this is laminated onto a base material that has been previously coated with an adhesive and dried. .

In any case, when pellet, powder, block, or paste resin is used as the synthetic resin, the moisture content of the leather powder must be reduced to 0 or 0 to prevent foaming and powder hydrolysis during heating and mixing or kneading. 5 wt%, and this dried leather powder, resin, and additives if necessary are mixed or kneaded under heating and processed into pellets, powder, etc., and then
Form into a film or sheet. In addition, when using a solution, the resin is dissolved or dispersed in a suitable solvent, the leather powder and additives are added thereto if necessary, and after stirring and mixing, the resin is formed into a film or notebook shape. The mixing ratio of leather powder and synthetic resin is 10 to 99wt of synthetic resin.
%, the leather powder ranges from 90 to 1 wt%. When the proportion of leather powder exceeds 90 wt %, the film or sheet becomes brittle, and when it is less than 1 wt %, the addition effect is not effective. The leather powder content in the tatashi synthetic resin is preferably 5 to 50 wt% in the case of a film, and 10 to 50 wt% in the case of a sheet.
60 wt% is preferable.

The thickness of the film or sheet as the skin layer thus formed is suitably 5 μm or more, and the leather powder is preferably uniformly dispersed. In addition, leather powder may be exposed on the surface, and in this case, it is useful to further improve the touch feeling and the sense of warmth.

As a forming method, dry film forming, wet film forming, calendar molding, inflation molding, T-die molding, press molding, etc. can be used.

A specific laminating apparatus used in the above manufacturing method is shown in FIGS. 1 to 3.

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

FIG. 2 shows an impregnating coating apparatus, in which an impregnable substrate 20 is introduced into an impregnating tank 21, where it is impregnated with an impregnating coating liquid 22 consisting of a leather powder-containing solution. After the liquid has been squeezed out,
It is introduced into the coagulation/washing tank 24, where it is coagulated and washed with water 25, and further dried by the dryer 2B to form a laminate 27.

FIG. 3 shows a wet coating device similar to the device shown in FIG. The laminate 40 is sequentially introduced into a laminate 40, solidified and washed with water 36, 37, and 38, and further dried in a drier 39 to form a laminate 40.

Since the thus obtained laminate contains leather powder at least in the skin layer, it has a good feel as a grip material due to its moisture absorbing and releasing properties and uneven texture.

In the present invention, the skin layer can be made microporous, or a microporous resin intermediate layer can be provided between the base material and the skin layer.

To make the epidermis layer microporous, add a water-soluble polymer substance, an inorganic substance such as salt, or a fine powder of an organic substance such as sugar to the mixture or solution for forming the epidermal layer in advance, and add this as a base layer as described above. After forming a film or sheet in a material or on a substrate, the polymer substance in the film or sheet may be dissolved and removed by washing with water or hot water, followed by draining and drying.

Note that when using a lamination method that involves a 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, a fine powder of water-soluble collagen, starch, seratin, etc. having a particle size of 0 umJd or less can be used.

On the other hand, in order to provide a microporous resin intermediate layer between the base material and the skin layer, a synthetic resin and a water-soluble polymer material are laminated on a non-impregnable base material according to the lamination method shown in Figures 2 and 3. A solution containing fine powder may be applied, washed with water, and dried. Note that leather powder may be added to this synthetic resin solution. As the synthetic resin, polyurethane resin is preferred.

In the microporous laminate obtained in this way, for example, in the case where the skin layer has been made microporous, the remaining leather powder absorbs water after the water-soluble polymer substance is dissolved and removed in the same way as a normal non-porous laminate. Moisture wicking and unevenness are maintained, and the microporous structure gives a matte feel similar to the pores of human skin.On the other hand, because the entire epidermis layer has become microporous, it is possible to create a non-porous laminate. It is inferior in durability and smoothness compared to.

FIG. 4 shows a typical example of the manufacturing process of the laminate and microporous laminate according to the present invention obtained as described above.

That is, the base material to which a wet layer coating is applied, if necessary, is wet impregnated. A film or sheet formed by kneading leather powder and synthetic resin is laminated on this base material using a welding agent if necessary, or a water-soluble substance is added to the leather powder and synthetic resin as necessary. A mixed solution is made by adding a solvent or the like, and then the mixture is coated and laminated to form a laminate. This laminate is washed to finally obtain a microporous laminate.

〔Example〕

The present invention will be explained in more detail below with reference to Examples.

Example 1 (Artificial leather type) Lump 12 of chrome-tanned cowhide waste leather (shaving leather)
00 kg was crushed using a crusher (manufactured by Hosoka Micron Co., Ltd.) into the original shape of the shaving waste leather (max: 1 cm width x 12
cm length), the leather is sequentially fed into a coarse crusher (hammer mill manufactured by Odate Co., Ltd., capacity: 600 kg/hr) to produce coarsely crushed leather powder with a particle size of approximately 10 mm or less. The moisture content of this coarse powder was 40 to 60 wt%.

Next, 350 kg of this wet coarsely crushed leather powder is placed in a vacuum dryer and dried until the moisture content becomes 20 to 30 wt%. Subsequently, 270 kg of this dry coarsely crushed leather powder was put into a degreasing machine,
1 while feeding n-hexane at 100β/min.
Stir for 15 minutes, perform extraction, defatte, and filter. The residual oil and fat content in the obtained coarse defatted powder was 0.5 wt% or less.

Next, the remaining solvent in this defatted coarsely crushed leather powder was heated at 1300C.
Purge with 2 kg/cnr G steam until the solvent (hexane) odor disappears.

The same degreasing machine was replenished with 2 m' of water at room temperature, and after stirring for 30 minutes, the water was drained by filtration. This hatch water washing operation is performed a total of four times to remove free ions such as metal ions and water-soluble components in the waste leather. Crushed leather powder after filtration and draining is 65-70wt
It contained % moisture.

Next, without adjusting the humidity, this was transferred to a steam steamer and steamed for 45 minutes at 130°C with 2ki/cnfG steam while stirring.

Next, the coarsely crushed leather powder after steaming was pre-dried in a dryer maintained at 90°C for 3 hours until the moisture content was 30-401%-t%, and then dried in a vacuum dryer at 45°C for 8 hours. 190 kg of dry coarse leather powder having a moisture content of 1+vt% or less is obtained.

Next, this was pulverized using a Fine Hefty Mill (manufactured by Hosokawa Micron Corporation) at 1700 rpm for 2 hours.

Subsequently, this was classified using a cyclone classifier to obtain 35 kg of fine leather powder with an average particle size of D5 [+= about 30 μm and D5
155 kg of coarse leather powder with a diameter of 0 to about 60 μm are obtained.

Incidentally, the coarse leather powder having a diameter of about 60 μm was circulated to the pulverization step.

Furthermore, 3-5 kg of this D50-approximately 30 μm leather powder was heated at an air pressure of 8 k using a jet mill (manufactured by Seishin Enterprise Co., Ltd.).
g/cri G, air volume 10 m/min, throughput 2
Under the condition of 0kg/H, until the total amount or D50≦7μm,
Refine.

Finally, this was classified using a cyclone (manufactured by Seishin Enterprise Co., Ltd.) to produce 3325 kg of ultrafine leather powder with D50≦7μm and D
50" Ultra-fine leather powder less than 2μm (in bald filter)
Gain 1.75 kg.

Production of Leather Powder Containing Film The properties of the thus obtained ultrafine leather powder (I) so≦7 μm (hereinafter referred to as leather powder A) are shown in Table 1 below.

Production of leather-like grip cover Leather powder A was mixed with a polyurethane resin solution (80 wt% solid content).
; The solvent is a mixture of equal amounts of dimethylformamide and ethyl methyl ketone (the same applies hereinafter), and 20 w [% (based on solid content, the same applies hereinafter) is added, and this leather powder-containing solution is mixed using the impregnating coach ink device shown in Figure 2. A base material was prepared by impregnating a 2 denier, 70 g/m polyester nonwoven fabric with 30 g/m so that the solid content was 30 wt%, followed by coagulation, washing with water, and drying.

Next, a polyurethane resin solution containing 30 t% of leather powder A is applied to this base material using the wet coating device shown in Fig. 3, followed by coagulation, washing with water, and drying.
A microporous polyurethane resin layer having a thickness of 200 μm and containing 20% by weight was formed.

Next, using the dry coach ink device shown in Figure 1, a polyurethane resin solution containing 30 wt% of leather powder A is applied onto the release paper and dried to produce a 30 μm thick polyurethane resin film containing leather powder. The surface of the microporous resin layer of the base material was adhered and laminated to a thickness of about 10 μm using a urethane adhesive to produce a leather-like grip cover laminate having a microporous resin layer.

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

In FIG. 5, 51 is a nonwoven fabric impregnated with polyurethane resin as a base material, and a microporous polyurethane resin layer 52 is formed on this nonwoven fabric 51, and a polyurethane resin is applied to this microporous polyurethane resin layer 52 via an adhesive 53. Layers 54 are laminated. The nonwoven fabric 51, the microporous polyurethane resin layer 52, and the polyurethane resin layer 54 each contain a predetermined amount of leather powder A.

Example 2 (Dry synthetic leather type) A polyurethane resin solution containing 20 wt% of leather powder A was applied onto a release paper using the dry coating device shown in Fig. 1, and dried to form a 100 μm thick polyurethane resin film containing leather powder. Make this and 30 denier, 130-14
A leather-like grip cover laminate was manufactured by adhering and laminating a 0 g/rn' nylon tricot base material with a polyurethane resin adhesive to a thickness of 10 μm.

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

In FIG. 6, a polyurethane resin 64 containing leather powder A is attached to a nylon tricot base material 61 via an adhesive 63.
or laminated.

Example 3 (artificial leather type) In the lamination process of Example 1 using the dry coating apparatus shown in FIG. 1, leather powder A was added at 30 wt% and the average particle size was 6.
5 μm water-soluble collagen fine particles (molecular weight 1,000
) A leather-like grip cover was produced in the same manner as in Example 1, except that a polyurethane resin solution containing 20 wt% of
Furthermore, this was soaked in hot water for about 5 minutes, washed, and then dried.
A leather-like grip cover laminate in which the skin layer was made microporous was obtained.

Comparative Example 1 (Artificial leather type) In the method for producing leather powder of Example 1, the coarsely crushed leather powder after steam purging was directly transferred to a steamer before being washed with water, and the coarse powder had a water content of 65 to 65%. Example 1 except that water was added and the humidity was adjusted until the concentration reached 70 wt%, followed by steaming.
The same method as above was repeated to produce I) ultrafine leather powder with so≦7 μm (hereinafter referred to as leather powder B). The properties of leather powder B are shown in Table 1 below.

Hereinafter, the method for manufacturing a leather-like clip cover was followed in the same manner as in Example 1 except that this leather powder B was used instead of leather powder A.
A leather-like clip cover laminate was produced.

Comparative Example 2 (Dry Synthetic Leather Type) In Example 2, leather-like clip covers were produced according to the same method as in Example 2, except that leather powder B made in Comparative Example 2 was used in place of leather powder A. A grip cover laminate was manufactured.

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

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

Comparative Example 5 The same leather powder manufacturing method as in Example I was followed in Example 1, except that the re-pulverization step and the subsequent classification step were not performed.
) was manufactured. The properties of leather powder C are shown in Table 1 below.

Next, in Example 1, an attempt was made to manufacture a leather-like clip cover laminate according to the same method for manufacturing a leather-like clip cover as in Example 1, using this leather powder C in place of leather powder A, or Because the particle size of Powder C was large, it was not possible to impregnate the polynistil nonwoven fabric with a predetermined leather powder content, so the process was discontinued.

Table 1 Next, the leather-like clip cover laminate obtained as described above was evaluated for surface feel, adhesion of white powder to hands, and matte appearance, and the results shown in Table 2 were obtained.

The evaluation method is as follows.

surface texture.

15 mm in diameter with the laminate surface (skin layer side) outside
The feel after holding it in the palm of your hand for 15 minutes.

Sweat Resistance Test Surface condition when artificial juice was dropped onto the surface of the laminate and exposed to an environment of 30°C and 95% RH for 24 hours.

Matte tone: Evaluation is based on the appearance of the surface of the laminate and the feel of it by hand.

As is clear from this table, the leather-like grip cover laminates of Examples 1 to 3 all had a good surface feel.
There was no change in the sweat resistance test, and there was no white powder adhering to the hands.
In addition, the matte appearance was also good or excellent, whereas the leather-like grip cover laminates of Comparative Examples 1 and 2 using leather powder B, which has different characteristic values from the leather powder A according to the present invention, failed in the sweat resistance test. White powder is generated, as in Comparative Examples 3 and 4,
Although there was no change in the sweat resistance test for the leather-like clip cover laminate that did not contain any leather powder, the surface texture and matte appearance were poor. Since the powder content could not be impregnated, further processing was impossible.

〔Effect of the invention〕

According to the present invention as described above, even if the grip cover is held with bare hands for a long time, it will not slip due to sweat, and even after long-term use, no white powder bleat will occur, so it can be used for a long time. This has the effect of providing a leather-like clip cover that can maintain stable performance.

[Brief explanation of the drawing]

1 to 3 are schematic configuration diagrams showing an example of a dry coating device, an impregnation coating device, and a wet coating device for producing the leather-like one-knob force bar laminate of the present invention, and FIG. Typical manufacturing process diagram for the body,
FIG. 5 and FIG. 6 are cross-sectional views showing the structures of Example 1 and Example 2, respectively. 1...Release paper, 2,22.33...Coach ink liquid or leather powder-containing resin solution, 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, 5
I... Nonwoven fabric as base material, 52... Microporous polyurethane resin layer, 53.63... Adhesive, 54.64.
...Polyurethane resin layer, 1.Nylon tricone base material.

Claims (3)

[Claims] (1) On the base material, the cortex content is 85 wt% or more and the oil content is 2
wt% or less, water-extractable Na^+ ions and Ca^2
5 to 60 wt% of leather powder and synthetic resin 95 in which the total amount with ^+ ions is 0.5 wt% or less, the average particle size D_5_0 is 7 μm or less, and the standard deviation of the particle size is 3 μm or less
A leather-like grip cover characterized by laminating a skin layer containing ~40wt% as a main component. (2) The leather-like grip cover according to claim (1), wherein the skin layer is microporous. (3) The leather-like grip cover according to claim (1), further comprising a microporous resin intermediate layer laminated between the base material and the skin layer.