JPH0920880A - Resin coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a resin coating film having a good smooth and sweat-free skin touch and a characteristic hand touch on the surface of a product, etc., from a resin containing the mixture of a solvent with fine gelatin powder having a specific particle size. SOLUTION: Gelatin powder or gelatin granules are ground with a jet mill blowing out jet air cooled at -15 deg.C at a rate of 6-8kg/cm<2> to obtain the gelatin powder having a finer particle size than 6μm without deteriorating the hydrophilicity of the gelatin. The gelatin powder is homogeneously suspended in a solvent such as dimethylformamide or toluene. The gelatin to be charged in the jet mill is preferably preliminarily classified with a sieve or an air- classifying machine to obtain the gelatin powder containing the gelatin powder having diameters of <=100μm in an amount of >=90wt.%.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a resin film containing ground gelatin powder.

[0002]

2. Description of the Related Art Gelatin is a kind of derived protein which is insoluble in organic solvents, has a characteristic that it swells in cold water and dissolves in warm water to become a highly viscous sol, and at a concentration of 2 to 3% or more, it is a greenhouse. It is used as a modifier for synthetic rubber because of its property of forming an elastic gel.

Further, in order to provide similar stretchability to a film provided on the surface of various products, to provide a function of absorbing and releasing moisture, and to simultaneously provide a water repellent function and a ventilation property, these films are used. Attempts have been made to incorporate gelatin into the resin solution that produces

As a result of many experiments, it has been clarified that the finer the particle size of gelatin contained in these resin films and the like, the more specific effects are exerted on the resin films.

[0005] In particular, in order to provide a good smooth feeling without a sweaty feeling and a good hand feeling without sweating on the surface of a film formed on the surface of a product or the like, the particle size of the gelatin powder contained in the film is reduced. It was convenient to align them in a finer range.

Therefore, gelatin that has been powdered or granulated has been pulverized with a dry ball mill or the like, and classified before use.

[0007]

However, in the conventional method of pulverizing with a ball mill, it is difficult to re-pulverize gelatin, and a pulverized gelatin powder having a uniform quality and a uniform fine particle size is obtained. I couldn't produce it.

Further, such a characteristic peculiar to gelatin is impaired, or a resin film produced by using a crushed gelatin powder mixed with a gelatin powder having a relatively large particle size has a peculiar smoothness and feel. However, there is a drawback that the moisture absorption / release function, expansion / contraction function, water repellency function, etc. peculiar to gelatin mixed in this film are not provided.

In particular, in the crushing by the simple method of crushing and grinding by the dry ball mill which is the conventional method, in this crushing,
A large amount of heat was generated due to the grinding, and various inconveniences were caused by this heat generation.

First, the heat generated during the pulverization by the ball mill may sometimes cause the gelatin being pulverized to be partially in a viscoelastic gel state, and it often happens that the gelatin cannot be efficiently pulverized into fine powder. Alternatively, powdery or granular gelatin is fused together to form a viscoelastic block. In particular, such inconveniences occurred remarkably, for example, when the water content of the gelatin to be pulverized was high, or when the gelatin was pulverized under humid conditions.

Next, when water is rapidly removed from the gelatin being crushed by the heat generated during the crushing by the ball mill, the hydrophilicity of the crushed gelatin powder is impaired, and the swelling by the water or the elution function to hot water is lost. In particular, the crushed gelatin powder based on crushing under the condition that the water content in the crushed gelatin is less than 2% by weight has such viscoelasticity and adhesion as to the gelatin powder, including its hydrophilicity. It has a drawback that various properties such as elasticity and stretchability are impaired.

From this point of view, in order to pulverize powder or granular gelatin by the pulverization method using a dry ball mill, the heat generated by friction during pulverization is accumulated as much as possible, or the friction heat is excessively generated. I needed to crush it slowly, taking a long time to avoid it. For this reason,
The crushing efficiency of gelatin was poor, and the particle size of the crushed gelatin powder to be finished had to be stopped within a relatively large range, and a finer gelatin powder could not be obtained.

Therefore, powder or granular gelatin is mixed and mixed with a liquid polymer or a resin solution diluted with various solvents, and the powder or granular gelatin mixed with the liquid polymer or resin solution is charged into a wet pulverizer. And then crushed.

The wet pulverization method has the drawbacks that the flow resistance of the liquid polymer or resin solution is large, stirring and pulverization are not performed smoothly, and the mixed gelatin is not uniformly dispersed in the polymer. Was. In particular, when the stirring of this kind of liquid polymer or resin solution is continued, the viscosity of these polymer or resin solutions tends to increase with time, and it may be difficult to perform a smooth pulverization treatment by a wet pulverizer. In many cases, when the pulverization temperature in the pulverizer was increased with the stirring of the pulverizer, such inconvenience on pulverization tended to occur more remarkably.

When gelatin is crushed by a dry ball mill, the device itself is provided with a cooling or exhaust device for removing the heat generated by the friction or impact, or a device for keeping the water content of gelatin constant. However, the crusher itself has the drawback of being large-scale.

Further, when powdered or granular gelatin is crushed by such a dry ball mill, the particle size of the gelatin powder produced varies depending on various conditions such as temperature and humidity in the crusher or agitation speed of the ball, resulting in a long particle size. Even if the powder is pulverized for a long time, the gelatin powder having a large particle size remains in the gelatin powder having a fine particle size.

Particularly when powdered or granular gelatin is crushed by a dry ball mill, the particle size is from 1.0 micron (in the case of elongated particles, measured on the short side, hereinafter referred to as μm) to about 50 μm. However, there is the disadvantage that a relatively large amount of gelatin powder with a relatively large particle size remains, while such an extremely fine particle size of gelatin powder is produced, which is a problem when crushing with a ball mill is continued for a long time. But it was the same.

As a result, when these gelatin powders are contained in a resin material such as a polyurethane resin solution to form a sheet or film, a part of the mixed gelatin protrudes from the surface of the sheet or film, and this causes In addition to giving a rough feeling to the surface, edge breakage easily occurs between the peripheral portion of the large gelatin particle and the sheet or film, and the large particle diameter of the gelatin particle falls off from the sheet or film, or from the portion. However, there was a problem that the surface of the film was cracked.

Particularly, the disadvantages associated with uneven particle size of gelatin powder on the surface are remarkable when an ultrathin film of about 0.002 mm is formed on the surface of a sheet, cloth, leather, paper or various molded products. It happened to.

Further, in the method for pulverizing gelatin powder by the above dry ball mill and the paint using the pulverized gelatin powder, granular or powdery gelatin is pulverized in a state of water content of about 10 to 15% by weight. This is mixed with various resin materials in its original state. However,
When such gelatin powder is mixed with a resin material, the finer the gelatin powder to be mixed, the more it tends not to be smoothly dispersed in the resin material. Especially, the target resin material is a viscous solution. In the case of a shape, etc., it has a drawback that it is not uniformly dispersed in this resin solution.

Furthermore, when this gelatin powder is mixed as a constituent of the film of various articles, the gelatin powder having a large particle diameter contained in the constituent elements of this film is formed on the surface of this film when the film is formed. There is an inconvenience of causing streaky scratches or clogging of the spray gun.

In view of the inconveniences in the conventional examples, the present invention eliminates the adverse effect on the crushed gelatin caused by the heat generated by the friction generated during the crushing of powdery or granular gelatin powder, and also provides a uniform grain in a short time. It enables the pulverization and molding of fine gelatin powder with a diameter, and does not impair the quality peculiar to gelatin, and forms a gelatin powder with a uniform particle size using a jet mill. The purpose of the present invention is to provide a resin film in which gelatin powder is uniformly mixed by preparing it in a suspension form.

[0023]

Means for Solving the Problems In order to achieve the above object, the resin film according to the present invention comprises mixing gelatin powder finer than 6 μm crushed by a jet mill into a solvent, and mixing the mixed gelatin powder. 6 μm in the formed resin film as a component of the molding resin solution for the resin film with the solvent containing
It has a constitution in which gelatin belonging to a finer range is uniformly contained.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a resin film according to a typical embodiment of the present invention will be described. Usually, solid gelatin that is prepared as a white powder or transparent flakes that is tasteless and odorless (herein, gelatin is mainly industrial gelatin, but various properties and concentrations of gelatin may be used, including glue. Is basically put in a jet mill in a state of air-dry water content (water content in the state of being left in the air = equilibrium water content) and pulverized. The pulverization by the jet mill is continued until the particles of the pulverized gelatin powder are in a range smaller than 6 μm in a state where the gelatin is not contacted and ground by the jet air.

In order to make the particle size of gelatin powder crushed by this jet mill uniform and to crush the crushed gelatin to the target particle size in a short time, the jet air used in the jet mill is The gelatin powder is jetted into the crusher as about 15 ° C., and the gelatin powder to be put into this jet mill is classified.
Fine gelatin powder belonging to a range smaller than μm is preferably classified by a sieve or an air classifier so as to be 90% by weight or more of the total amount of the gelatin powder.

The pulverization by the jet mill is continued until the grain size of the introduced grain or powdery gelatin becomes finer than 6 μm. Therefore, the grinding conditions such as the grinding time by the jet mill are as follows: the capacity of the jet mill, the air pressure and the air input amount used in the jet mill, the type and input amount of the gelatin to be input to the jet mill, and the jet mill. Although it may be changed as needed depending on various conditions such as the grinding temperature, it is necessary to grind the gelatin within the range where the temperature of the jet air during the grinding is not increased as much as possible so as not to deteriorate the quality of the ground gelatin.

Further, in order to make the crushing by the above-mentioned crusher more effective, the crushed gelatin is pre-crushed, and the particle size thereof is determined by air classification by true specific gravity or sieve classification by bulk. They are prepared and usually prepared by crushing with a dry crusher such as a turbo mill.

Further, the air used for crushing in this jet mill is dehumidified by cooling to about -15 ° C. to suppress the temperature rise due to impact crushing occurring in the jet mill as much as possible.

The average particle size of gelatin put into this jet mill is 100 μm, and jet air jetted into the jet mill is 6 kg / cm ^{2 to} 8 kg / cm ^2.
Moreover, when the air was cooled to -15 ° C and used, the hydrophilicity of the crushed gelatin was not impaired, and a gelatin powder having a particle size finer than 6 µm was obtained in a very short time compared with crushing by a dry ball mill. We were able to.

Since the gelatin is crushed by the air of the jet mill in this way, the gelatin being crushed is less likely to melt, swell, or harden due to the heat generated during the crushing. It has the feature that the moisture absorption and desorption phenomenon of gelatin inside is small. As a result, in the process of grinding the gelatin, the water content of the gelatin is not increased, and the gelatin does not fuse with each other or become soft and unsuitable for grinding or impact grinding.
Further, the quality does not deteriorate until the water content of the gelatin is reduced in the process of grinding the gelatin and the hydrophilicity is impaired. The gelatin powder pulverized in this way is mixed with a solvent and used for molding a resin film.

Example 1 Gelatin was pulverized with a turbo mill in the air-dry water content state and classified to have an average particle size of 34 μm. The water content of this gelatin powder was 12% by weight, but in actual grinding of gelatin powder, it was possible to use gelatin powder having a water content in the range of 5 to 15% by weight. 8 kg of crushed air of a jet of gelatin having an average particle diameter of 34 μm
/ Cm ² and a classification rotor at 7,000 rpm for 60 minutes, and gelatin powder having a particle size of less than 6 μm was produced while sequentially performing classification correction. The particle size distribution of the gelatin pulverized by this jet mill is as follows. The pulverized gelatin powder was classified by an air volume classifier based on the true specific gravity to obtain a gelatin powder having a range smaller than 6 μm. 10.00 μm or more to 0.0 wt% 9.00 〃 to less than 10.00 μm 39.4 〃 8.00 〃 to 9.00 〃 36.0 〃 7.00 〃 to 8.00 〃 0.0 〃 6 0.00 〃 to 7.00 〃 10.6 〃 5.00 〃 to 6.00 〃 7.0 〃 4.00 〃 to 5.00 〃 2.4 〃 3.00 〃 to 4.00 〃 3.0 〃 2.00 〃 to 3.00 〃 1.0 〃 1.00 〃 to 2.00 〃 0.5 〃 0.09 〃 to 1.00 〃 0.1 〃

Example 2 Gelatin powder pulverized by the above turbo mill and classified by the particle size of 100 μm was put into a jet mill to obtain 6 kg / c.
Milling air of m ² was cooled to −15 ° C. and sprayed into a jet mill to mill gelatin powder. Grinding with this jet mill was continued for 70 minutes while classifying with a classifying rotor of 7,000 rpm, most of which was 6 μm.
It was considered to be a finer range of gelatin powder. 8.0 μm or more to less than 9.0 μm 21.0% by weight 7.0 〃 to 8.0 〃 18.0 〃 6.0 〃 to 7.0 〃 15.0 〃 5.0 〃 to 6.0 〃 19 0.0 〃 4.0 〃 to 5.0 〃 12.0 〃 3.0 〃 to 4.0 〃 10.0 〃 2.0 〃 to 3.0 〃 3.0 〃 1.0 〃 to 2.0 〃 1.7 〃 0.09 〃 to 1.0 〃 0.3 〃 In this example, lowering of the water content in the crushed gelatin powder can be avoided more than in the above-mentioned Example 1 and the crushed gelatin powder is The quality was not impaired by the heat generated during grinding. Therefore, the gelatin powder pulverized by the method of Example 2 has the same hydrophilicity as that of the gelatin material before the pulverization treatment, and has the property of causing swelling due to moisture absorption, appropriate sol and gelation. Had.

The gelatin powder pulverized by the above method has the following features in the pulverization process and the produced gelatin powder. First, the granular or powdered gelatin put into the jet mill is crushed in a state of being wrapped in the air of the jet mill, so that the gelatin does not fuse with each other and the surface of the ball or the crusher is not crushed. No fusion. In particular, heat generated by grinding or impact of the ball is not dispersed and directly transmitted to the gelatin by the air of the jet mill, and there is no risk of deterioration of the gelatin or fusion of the gelatin due to the heat. In addition, when the gelatin is pulverized while being covered with low-temperature jet air, in the pulverization process of the gelatin, the gelatin becomes wet and swells or becomes sol-like, or water evaporates and heats in the pulverization process. No accompanying gelling phenomenon occurs. Therefore, the gelatin milled by this jet mill does not impair the swelling function specific to gelatin or the characteristics such as hydrophilicity and specific viscoelasticity. Also, it is possible to reliably and easily produce a fine gelatin powder having a uniform particle size without making it difficult to pulverize due to the dampness of gelatin and the increase in viscosity with heating during the pulverization process of gelatin. Can be. Furthermore, the gelatin powder obtained by the pulverization and classification has a particle size smaller than 6 μm in any case according to the above-mentioned pulverization method, and does not fuse with or entangle with each other. When this ground gelatin powder is mixed in a solvent, it is uniformly dispersed in the solvent, and the gelatin powder is generally dispersed like a suspension.

The gelatin thus pulverized using a jet mill is mixed and mixed with a solvent. Each of the gelatin powders mixed and mixed in these solvents floats in the solvent in an independent state and is shielded from the outside air. This facilitates the management of the pulverized gelatin powder, and the pulverized gelatin powder does not become wet, harden, or fuse with each other.

The gelatin powder crushed in this way is
It is added to the resin for film formation together with the mixed and mixed solution of gelatin powder. The method of mixing and the amount of mixing are appropriately determined according to the characteristics of the resin film to be molded.

The solvent used above is typically an organic solvent, and a solvent suitable for a resin material such as a resin solution containing crushed gelatin is used. And this solvent requires that the gelatin be insoluble, typically dimethylformamide, toluene,
Methyl ethyl ketone and the like are used other methanol, isopropyl alcohol, n-butanol, benzyl alcohol, ethyl acetate, butyl acetate, acetone, methyl isobutyl ketone, cyclohexane, tetrahydrofuran,
Dioxane, xylol, 2-nitropropane, ethane dichloride, trichlorethylene, perchlorethylene, methyl cellosolve, ethyl cellosolve and the like are used.

Since such a solvent is insoluble in gelatin, even if gelatin is mixed into the solvent, the gelatin does not swell or melt, and the water content in the gelatin is absorbed by the solvent. The gelatin does not harden. In addition, during storage of gelatin, it has a feature that gelatin put in this solvent is stored in the same state as when it is mixed in this solvent.

The resin mixed with the solvent containing the gelatin powder is a resin suitable for the film to be produced, and is made into a solution by the solvent. That is, the gelatin powder is usually pulverized using a solvent suitable for the resin material of the resin film to be molded.

Therefore, various resin films are formed by selecting the solvent and the resin material used for the above-mentioned mixing of the gelatin powder.

The resin mixed with the solvent containing the gelatin powder may be in the form of paste, powder or liquid, and the paste or viscosity can be adjusted by adjusting the blending amount of the solvent. It is in the form of a high solution or a dilute solution having a low viscosity.

In this way, a film is formed using the resin liquid containing the solvent. Various coatings are applied on the surface of cloth, paper, leather or wood products and other products, and
A method of immersing cloth, paper, etc. in a resin solution mixed with the solvent, and coating the surface of the release paper,
The resin film on the surface of the release paper is created by a method of transferring and adhering it to the surface of cloth, resin sheet, paper, leather or the like.

The film thus produced has a thickness of 0.0 because the particle size of the gelatin powder contained in these materials is within the range of 6 μm or less.
Even in the range of 2 to 0.002 mm, the mixed gelatin powder did not stand up or stick out from the surface of this film, and the film was smooth and had a good feel to the touch.

Further, by eluting a part of the gelatin powder contained in the resin molded product of the film formed as described above, a large number of pores finer than several microns are formed on the surface of this film. be able to.

By providing pores finer than 2 to 3 μm on the surface of the film, the film is provided with air permeability. Particularly, the air permeability of the film is about 0.0004 μm. It has the feature that it allows water vapor of a certain particle size to pass through but does not allow water droplets to pass through. From this, water resistance and moisture permeability can be provided to the film.

Therefore, 0.02-0.00 containing the above-mentioned gelatin powder on the surface of various fabrics, leathers, wood products, etc.
When a film having a thickness of 2 mm is formed and the gelatin powder of this film is eluted, the water resistance and moisture permeability peculiar to these cloths, leathers, wood products, etc. are brought about. By the way, the diameter of a raindrop is usually 2000 μm, and even a fine rain shower has a diameter of 100 μm, and it does not pass through the fine holes provided in this film or the like. Also, raindrops attached to the surface of the film do not seep through the fine holes due to the surface tension.

Example 3 A polyurethane resin coating solution was prepared by using the solvent containing the gelatin powder, a film-like film was formed by this coating solution, and the film-like film was transferred onto the surface of the woven or knitted fabric.

Gelatin powder finer than 6 μm 10 parts by weight Toluene 70 parts by weight Polyurethane resin solid content 30 parts by weight This resin solution was applied on the surface of a release paper by a doctor knife coating method to a thickness of 0.008 mm, and Was dried and then peeled off from the release paper to form a film-like film having a thickness of 0.008 mm. Also, the release paper was peeled off while adhering to the surface of the non-woven fabric having a thickness of 1.5 mm without peeling off the film to form a skin layer on the surface of the non-woven fabric. Then, when this nonwoven fabric was immersed in hot water at 60 ° C. and washed with hot water for 15 minutes, gelatin powder contained in the film disappeared corresponding to 35% by weight of the total amount. In addition, when a coating film was formed by increasing the amount of the gelatin powder mixed by 5 parts by weight between 3 parts by weight and 30 parts by weight, the above-mentioned Example 3 was obtained.
When the amount of gelatin powder was 3 parts by weight at a ratio of 3, the gloss of the film surface produced was good, and while it had sufficient waist strength, there was a sticky feeling upon contact. In addition, the coating surface containing 35 parts by weight of gelatin powder has a contact resistance peculiar to gelatin and a good feel to the skin, but when a strong force acts on the coating surface, wrinkles are generated on the coating surface. In the product in which the film of (1) was laminated, the surface of the base material was partially exposed when the surface was twisted. Therefore, the optimal amount of the gelatin powder is 3 to 30 parts by weight. However, the amount of the gelatin powder can be further changed depending on the type of the molding resin for the film, the amount of the solvent used, the molding conditions, and the like.

In the elution of gelatin powder by washing with hot water as described above, the higher the temperature of the hot water used, the greater the amount of gelatin powder contained can be eluted in a shorter time, but the film or laminate film is damaged. Or, there is a disadvantage that the base material is damaged. From this fact, comprehensively taking into consideration the type of fabric on which the film is laminated, the material properties and the material properties of the film itself, the amount of gelatin powder contained in the film, the amount of gelatin powder eluted from the film, etc. ,
This film or the gelatin powder contained in the film is eluted. In the polyurethane resin film of the above example, it is ideal to elute the contained gelatin powder with hot water or hot water of 60 to 150 ° C, and the elution amount of the contained gelatin powder is small with hot water of 60 ° C or less, It took a long time.

Example 4 Toluene 70 parts by weight Gelatin powder finer than 6 μm 10 parts by weight Polyvinyl chloride resin 30 parts by weight The vinyl chloride film produced in this Example 4 has increased flexibility and is more stretchable than a conventional vinyl chloride film. Significantly increased and provided a moisture absorption function. In addition, a film was formed with the above blending amount.

Example 5 Toluene 70 parts by weight Gelatin powder finer than 6 μm 10 parts by weight Acrylic resin 30 parts by weight When a film was formed with the resin solution having the compounding ratio of Example 5, excellent abrasion resistance and moisture absorption function were obtained. It was made to have a film.

Example 6 Toluene 70 parts by weight Gelatin powder finer than 6 μm 10 parts by weight Polyvinyl chloride resin 15 parts by weight Acrylic resin 15 parts by weight A film formed using the resin solution having the compounding ratio of Example 6 is hygroscopic. And has a good contact resistance and an appropriate feeling of touch.

Example 7 Ground gelatin powder was mixed and mixed in toluene. Toluene having this ground gelatin powder was mixed with polyester of a two-component reaction type urethane paint, and then isocyanate was added and blended, and a film thickness of 0 was obtained by a spray gun. A coating film of 0.006 mm was obtained. This coating film had an excellent matte effect, and had a good texture when touched with no stickiness. In this example, a coating film was formed in the range of 10 to 40% by weight of gelatin powder relative to the total weight of polyester and gelatin powder in the two-component reactive urethane resin coating material.

Example 8 A liquid urethane resin solution (yellowing-free one-component polyurethane, non-volatile content 30%) was mixed with a mixture of methyl ethyl ketone to prepare 2 parts.
The mixture was adjusted to 0 to 50 poise (25 ° C.), 100 parts by weight of this urethane resin was mixed with 50 parts by weight of gelatin powder together with toluene, and the mixture was stirred and mixed so as to be 100 poise (25 ° C.). This mixture was sprayed on a PVC plate with a spray gun and dried at 100 ° C. for 1 minute to obtain a coating film having good hygroscopicity and a high matting effect.

Example 9 A film having a thickness of 0.006 mm obtained by coating a release liquid with a mixed solution obtained by mixing a solvent containing 30 parts by weight of gelatin powder in 100 parts by weight of a urethane resin and drying it. The film-like coating was transferred to a textile substrate and laminated. The surface of the woven fabric created in this way has no sticky feeling,
The feel was also excellent.

Example 10 A one-pack type urethane resin containing gelatin powder (mixed solution of non-volatile content of 30% by weight using gelatin powder-containing methyl ethyl ketone as a solvent) was coated on release paper with comma roll, and dried.
Further, on this coating layer, a two-pack type urenta resin containing gelatin powder (a mixed solution of non-volatile content of 50% by weight using gelatin powder-containing methyl ethyl ketone as a solvent) was applied,
After drying, a laminated film was formed, and the laminated film was peeled off from the release paper and laminated and bonded to the surface of the nonwoven fabric.
The surface of the non-woven fabric having the film-like laminate film had no sticky feeling, and the adhesive strength was the same as that of the laminate adhesion containing no gelatin powder.

[0056]

In the present invention, the gelatin powder is pulverized in the state of being separated by the air of the jet mill, so that the gelatin powders do not directly touch each other and are fused to each other.

Further, when the gelatin powder is crushed, heat is not generated due to impact crushing, and there is no problem of fusion between gelatin powders or quality deterioration due to heat change.

Furthermore, since the gelatin powder is crushed in the state of being wrapped in the air of the jet mill, the gelatin powder does not extremely dry or swell in the crushing process. From this, there is little inhibition of hydrophilicity due to drying of the gelatin powder, and there is little inconvenience that the gelatin powder becomes viscous with swelling and the pulverization is inhibited. From these facts, it was possible to reliably and efficiently produce a gelatin powder having a particle size in a range smaller than 6 μm.

Furthermore, since the gelatin pulverized into fine powder is dispersed in a solvent in a suspension state, the film can be blended smoothly with the molding resin, and the gelatin can be mixed in the resin mixture. It has the feature that gelatin powder is uniformly dispersed.

Therefore, when a film is formed by using a resin mixture containing gelatin powder belonging to a finer range than 6 μm above, the film is formed with the gelatin powder uniformly dispersed in the film. It is formed. From this fact, this film has a characteristic that moisture absorption and desorption characteristic of gelatin, an appropriate contact resistance, and stretchability are brought and electrostatic charge is prevented.

Further, since the particle size of gelatin powder contained in this film is finer than 6 μm, it was made possible to form this film thinly. Especially as a film 0.00
A film having a thickness of 6 mm was formed, and the mixed gelatin powder did not stand up or stick out from the surface of the formed film, and the surface was good in touch and smooth.

Further, since the gelatin powder is uniformly exposed on the surface of the formed film, hygroscopicity is effectively provided on the surface of this film, and a good feeling of touch is provided.

Furthermore, when the mixed gelatin powder is eluted from the surface of the film to be formed, countless fine holes of several microns are formed on the surface of this film, which is peculiar to the surface of the film to be formed. It has the feature of providing a moisture absorbing / releasing function, especially a water vapor permeable function.

When the surface of the film formed above is subjected to a sanding treatment, the moisture absorption function and the water vapor permeation function of the gelatin powder contained in the film and the good feel to the skin are further promoted. .

The film using the gelatin powder according to the present invention is used as a synthetic leather material for various furnitures, personal belongings such as bags, interior materials for automobiles, etc., because of its characteristic content in the above, and is also not electrostatically charged. It is used for various electronic devices and keyboards for these operators.

Further, the film having the gelatin powder on the surface can be produced or used by the same method or the same method as the method for forming a film not containing gelatin powder. From this, the film using the crushed gelatin powder according to the present invention can be used as a means such as surface makeup of all commodities in daily life.

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Claims (1)

[Claims] 1. Gelatin in the form of powder or granules is crushed by a jet mill and classified to obtain gelatin powder having a particle size smaller than 6 microns, and the gelatin powder is a solvent such as dimethylformamide and toluene. A resin film characterized by being mixed and mixed with a part of a resin film composition to be formed.