JPH0554856B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a transparent resin molded product and a method for producing the same. More specifically, a resin composition in which a crystalline thermoplastic resin (A), an inorganic fibrous filler (B), and a liquid organic compound (C) are uniformly kneaded is molded by an injection molding method or an extrusion molding method, and then After that, the molded product
A solvent that is a good solvent for (C) and a poor solvent for (A)
This invention relates to a resin molded product and its manufacturing method, which is characterized by forming fine communicating pores in the molded product by extraction and removal of It has air permeability even though it is transparent, and it has air permeability while being partially permeable to organic solvents. [Prior Art] In recent years, various packaging forms and packaging materials have been improved for the purpose of improving the living environment. for example,
Packaging materials for dehumidifiers, air fresheners, insect repellents, deodorizers, deodorants, desiccants, etc. have traditionally been made using Japanese paper, non-woven fabrics,
Porous membranes, glass or plastic containers with openings, glass or plastic containers partially replaced with breathable materials, and the like are used to improve the living environment. JP-A-59-232127 discloses a container having a microporous wall and a method for manufacturing the same. The container is made by molding a resin composition containing a thermoplastic resin that is poorly soluble in a solvent, a thermoplastic resin or compound that is easily soluble in a solvent, and further an appropriate inorganic substance as necessary, and then molding the thermoplastic resin or compound. It is a container with a microporous wall obtained by solvent extraction. However, the substance to be extracted and removed is a polymeric substance such as a thermoplastic resin or a compound, and the specification clearly states that the substance to be extracted and removed is a component that can be at least partially eluted by a solvent. . Furthermore, it is described that the extraction solvent is a high boiling point solvent, and that the solvent is heated to 60 to 80°C during extraction. Furthermore, Japanese Patent Application Laid-Open No. 59-64640 describes a method for producing a porous sheet by melt-blending a crystalline, thermoplastic polymer with a compound such as mineral oil, dioctyl phthalate, or mineral spirits.
A method for producing a microporous sheet is disclosed in which a sheet is formed from a solution, cooled, phase separation is caused, and then stretched to remove the compound. In addition, Japanese Patent Publication No. 58-32171 describes a method for producing a porous membrane by mixing an inorganic fine powder, an organic liquid with an SP value of 8.42 to 9.9, and a polyolefin resin, followed by melt molding, and then extracting the organic liquid. A method for producing a microporous membrane is disclosed. [Problems to be solved by the invention] Conventional packaging materials or containers for dehumidifiers, fragrances, insect repellents, deodorizers, deodorants, desiccants, etc. are expensive due to their complicated shapes, and the lifespan of the drugs is limited. The disadvantage was that it was difficult to control. For example, dehumidifier containers intended to prevent the growth of mold have a double structure: a container with a raised bottom near the opening of the container containing the deliquescent agent, and a container that receives absorbed moisture; For example, sexual drugs are packaged in a porous sheet and placed in a molded product having mesh-like openings. However, it has the disadvantage that the medicine or absorbed moisture spills out when it falls over, and its double structure makes it expensive. As for porous sheets, they have low water resistance and low strength, so there is a risk that absorbed water will leak out, and because they have a double structure, they are expensive. In addition, fragrance containers are those in which fragrance is solidified with agar or petrolatum, etc., and placed in a glass or plastic container with a partially opening, or a container in which the fragrance is mixed with a volatile solvent and placed in a glass or plastic container with a partially opening. Or there are items placed in plastic containers. However, the solidification process is complicated and expensive, and it is difficult to control the lifespan of the drug. However, there is a drawback that the medicine inside the container spills when the container is tipped over, and the shape of the opening is complicated in order to properly volatilize the aromatic agent, resulting in an expensive product. As packaging materials or containers for the above-mentioned products, there is a demand for porous bodies that have appropriate air permeability, strong water resistance, and shape retention. In response to such demands, conventional porous materials have the following serious drawbacks. Sintered bodies are examples of porous bodies that have air permeability and shape retention properties, but they have large pore diameters of 0.5 to 50 μm, allowing gas to pass through them with almost no resistance, but they leak and cannot be used as containers for liquids. However, the content is limited to solids or granules with a large particle size, and manufacturing disadvantages include a narrow degree of freedom in shape and high cost. On the other hand, the container prepared by the method disclosed in JP-A No. 59-232127 has an uncertain pore shape because the material to be extracted is a polymeric substance that is solid at room temperature, and has a high passage capacity. In order to extract to a certain degree, severe process conditions such as high temperature and long time are required, and it has been extremely difficult to continuously obtain a product with passing ability. On the other hand, the above-mentioned Japanese Patent Application Laid-Open No. 59-64640 discloses a method for manufacturing a microporous sheet that removes a specific compound blended with a polymer, but does not disclose a molded product by injection molding or blow molding. In addition, there were major limitations on the manufacturing method, such as the fact that micropores were created through the stretching process. On the other hand, the porous membrane prepared by the method disclosed in Japanese Patent Publication No. 58-32171 had the disadvantage of being water-wettable and having low water pressure resistance. There was a problem in that dimensional shrinkage of porous molded articles after extraction treatment occurred by more than 10% when inorganic fine powder was added. Therefore, it is an object of the present invention to provide a resin molded article that exhibits little dimensional shrinkage due to solvent treatment, has appropriate permeability and permeability, or has both sterilization and liquid tightness. [Means for Solving the Problems] According to the present invention, active agents such as dehumidifiers, fragrances, insect repellents, deodorizers, deodorants, desiccants, etc. can be packaged inexpensively and easily. Furthermore, by adjusting the maximum diameter and porosity of the open pores, the lifetime of the active agent can be controlled. Furthermore, gases can pass through, but liquids and solids can remain sealed. The resin molded product of the present invention is made of crystalline thermoplastic resin (A)
When 100 parts by weight, length is L, and diameter is D, L/
50 to 200 parts by weight of an inorganic fibrous filler (B) with a D of 15 or more, which is compatible with (A) above the melting temperature of (A) and does not substantially volatilize during the molding process, and is molded from room temperature. 20 to 150 parts by weight of a liquid organic compound (C) that has substantial fluidity within a temperature range, when the sum of (A) and (B) is 100 parts by weight.
A homogeneous resin composition consisting of parts by weight is molded by injection molding or extrusion molding, and then the molded product is treated with a solvent that is a good solvent for (C) and a poor solvent for (A). This resin molded product is characterized by forming fine communicating pores in the molded product by extracting and removing (C). In addition, the method for producing a resin molded product of the present invention includes 100 parts by weight of a crystalline thermoplastic resin (A), an inorganic fibrous filler ( B) 50 to 200 parts by weight and above the melting temperature of (A)
A liquid organic compound (C) that is compatible with (A), does not substantially volatilize during the molding process, and has substantial fluidity in the range of room temperature to molding temperature is added to 100% of the sum of (A) and (B). A homogeneous resin composition consisting of 20 to 150 parts by weight is molded by injection molding or extrusion molding, and then the molded product is molded into a resin composition that is a good solvent for (C) and
It is characterized by forming fine communicating pores in the molded product by extracting and removing (C) with a solvent that is a poor solvent for (A). The manufacturing method of the present invention described above will be detailed as follows. (1) 100 parts by weight of crystalline thermoplastic resin (A), length L,
50 to 200 parts by weight of an inorganic fibrous filler (B) whose L/D is 15 or more when the diameter is D, and which is compatible with (A) at a temperature higher than the melting temperature of (A) and is substantially A uniform liquid organic compound (C) that does not volatilize and has substantially fluidity in the range of room temperature to molding temperature, consisting of 20 to 150 parts by weight when the sum of (A) and (B) is 100 parts by weight. Make a molten body. At that time, if necessary, 0
~1 part by weight of a coupling agent may be added. (2) The melt is cooled and made into pellets by a known method, and molded into any desired shape by injection molding or extrusion molding. At this time, by adjusting the composition of the resin and the cooling temperature, spherulites of the crystalline thermoplastic resin are formed in the melt while incorporating the inorganic fibrous filler, and as this progresses, the liquid organic compound is separated from the spherulites. It is expelled, solid-liquid separation occurs, and the spherulites of the crystalline thermoplastic resin take in the inorganic fibrous filler and are connected, creating a structure in which the liquid organic compound exists between them. (3) The structure of the aggregate consisting of the inorganic fibrous filler containing the liquid organic compound and the fine spherulites of the crystalline plastic resin is firmly fixed by further cooling. (4) Molded products with this fixed structure can be extracted with liquid organic compounds by extraction using a good solvent for liquid organic compounds that is poorly soluble in crystalline thermoplastic resins and inorganic fibrous fillers. It is removed and further dried to form a microporous resin molded product consisting of an aggregate of the inorganic fibrous filler and fine spherulites of the crystalline thermoplastic resin. (5) The spherulites of crystalline thermoplastic resins have an amorphous part on the outer periphery, and during the process of drying and removing the solvent, the amorphous part deforms and prevents the distance between the centers of the spherulites from becoming closer. Therefore, by maintaining the distance between the spherulites, the inorganic fibrous filler maintains the dimensions of the molded product made in (4). Preferred examples of crystalline thermoplastic resins that can be used in the present invention are polyethylene, polypropylene; preferably homopolymers of isotactic polypropylene, poly(4-methylhentene)
1. Polybutene-1, polyamide; preferably nylon 6 or nylon 66, polyester; preferably polyethylene terephthalate, polyvinylidene chloride, polymer bonate, polyacetal, polysulfone, tetrafluoroethylene-ethylene copolymer. 2 of the crystalline thermoplastic resins as exemplified above.
Mixtures of more than one species can also be used. The length of the inorganic fibrous filler that can be used in the present invention is 15 times or more the diameter. Specifically, potassium titanate fiber (Teismo, manufactured by Otsuka Chemical), calcium metasilicate needle crystal (NYAD,
manufactured by NYCO), magnesium oxide fiber (OMS,
(manufactured by Ube Industries). However, asbestos, attapulgite, glass fibers, carbon fibers are also suitable for use. The following table shows an example of the general properties of the above inorganic fibrous filler.

[Table] General inorganic fillers are roughly divided into forms depending on the purpose of use: fibrous, plate-like, needle-like, flaky,
There are spherical and irregular shapes. As a result of repeated comparative studies aimed at reducing dimensional shrinkage of resin molded products, the present inventors found that plate-like, flaky, spherical, and amorphous shapes are relatively less effective in reducing dimensional shrinkage. On the other hand, in the case of fibrous or acicular shapes, the effect of reducing dimensional shrinkage is remarkable, and furthermore, the strength, air permeability, and moisture permeability can also be improved. The proportion of the inorganic fibrous filler used is 50 to 200 parts by weight, preferably 70 to 180 parts by weight, based on 100 parts by weight of the crystalline thermoplastic resin. If the proportion of the inorganic fibrous filler is less than 50 parts by weight, the effect of preventing dimensional shrinkage and reinforcing effect will be poor, and if it exceeds 200 parts by weight, kneading and molding will become difficult. The liquid organic compound that can be used in the present invention must exhibit substantial fluidity in the range from room temperature to molding temperature, must not be substantially volatile during molding, and must be compatible with the crystalline thermoplastic resin used. It is necessary to be compatible with the crystalline thermoplastic resin above the melting point. Specifically, the boiling point
The initial boiling point is preferably 180°C or higher, and in the case of a mixture, the initial boiling point is preferably 180°C or higher, and more preferably the boiling point or initial boiling point is 200°C. Liquid organic compounds exhibiting the above characteristics include hydrocarbons having a carbon number of 11 to 80, either as a single substance or as a mixture, and among them liquid paraffin, polybutene, and naphthenic oil are preferred. However, phthalates, phosphates, fatty acid esters, alkyl epoxy stearates, epoxidized soybean oil, diisodecyl 4,5 epoxytetrahydrophthalate, chlorinated paraffins, polyester plasticizers, perfluorocarbons, polyethylene glycols are also suitable for use. . However, not all of the crystalline thermoplastic resins and liquid organic compounds exemplified above can be used in any combination, and the liquid organic compound can be used in combination with the crystalline thermoplastic resin and the liquid organic compound at a temperature equal to or higher than the melting temperature of the crystalline thermoplastic resin and the liquid organic compound. It is necessary to choose from compatible ones. Table 1 shows examples of combinations of crystalline thermoplastic resins and liquid organic compounds suitable for use in the present invention, and examples of solvents suitable for use.

[Table] The proportion of the liquid organic compound used is 20 to 150 parts by weight, preferably 25 to 100 parts by weight, based on 100 parts by weight of the crystalline thermoplastic resin and inorganic fibrous filler. It is. If the proportion of the liquid organic compound is less than 20 parts by weight, the molded product will be substantially impermeable to gas or liquid, and if it is more than 150 parts by weight, it will be difficult to injection mold or extrude into any shape. Even if it could be molded, the strength would be extremely weak. In preparing the molten mixture of the crystalline thermoplastic resin, inorganic fibrous filler, and liquid organic compound, a known kneader such as a single screw extruder, twin screw extruder, Banbury mixer, kneader, etc. is used. It will be done. Generally, the molten mixture is once cooled to form a pellet-like resin molded product using a known device and then prepared. However, in the extrusion molding method, it may be possible to directly mold the material into a sheet or tube through a die or the like from a kneader. In the injection molding method or the extrusion molding method, it is preferable to prepare a resin molded product having fluidity suitable for each molding method and maintain the cylinder temperature at the plasticization temperature of the resin molded product. The plasticizing temperature of the resin molded product tends to be lower than that of the crystalline thermoplastic resin itself, and another feature of the present invention is that the electric power required to heat the cylinder of the molding machine can be reduced. Cooling conditions are very important in order to obtain a microporous molded product of constant quality. That is, in the present invention, spherulites of crystalline thermoplastic resin are formed, and during the
Since these are interconnected pores, it is important to cool the crystallization under conditions that give the highest crystallization rate. The cooling temperature suitable for the present invention must be adjusted depending on the content of the inorganic fibrous filler and liquid organic compound, the desired porosity, the maximum pore diameter, etc., but it is 150°C lower than the melting point of the resin composition. It is preferred to adjust between temperatures. If the cooling temperature is too low, the molded product becomes substantially impermeable to gas or liquid, and if the cooling temperature is too high, molding becomes difficult. After molding, extract the liquid organic compound present between the spherulites of the crystalline thermoplastic resin and the inorganic fibrous filler using a good solvent for the liquid organic compound and a solvent that is poorly soluble in the crystalline thermoplastic resin. It is removed to obtain a microporous molded product. As a solvent that satisfies the above properties,
Although various options are possible, it should be determined in consideration of the extraction power, toxicity, flammability, ease of recovery, ease of removal from resin moldings, etc. of the liquid organic compound. Solvents that satisfy the above properties include halogenated hydrocarbons, such as methylene chloride, dichloromethane, perchlorethylene, 1,1,1-trichloroethane, and trichlorofluoromethane (Freon-11 ), trichlorotrifluoroethane (Freon-113), and other fluorinated hydrocarbons. Fluorinated hydrocarbons are preferred, and trichlorotrifluoroethane (Freon-113) is more preferred. Further, since halogenated hydrocarbons have a very high ability to dissolve liquid organic compounds even at room temperature, the extraction process can be performed without heating, which is a great advantage in terms of production. However, kerosene, methylethyleketone, acetone, cyclohexane and water can also be used. The time required for extraction depends on the content of liquid organic compounds,
Although it varies depending on the shape of the molded product and the porosity of the resin molded product, the time is 30 seconds to 20 minutes, preferably 1 to 20 minutes.
It's 15 minutes. If the treatment time is too short, residual impurities will increase and the porosity will be low; if the treatment time is too long, problems will arise in terms of economy in terms of the amount of solvent used and production. Extraction methods include immersion, showering, steam cleaning, ultrasonic cleaning, boiling, etc., but the method should be determined to minimize loss due to solvent evaporation and ensure efficient processing. . The shape of the resin molded product can be selected in any way depending on the intended use. The wall thickness of the part that has the ability to substantially permeate gas or liquid is 0.05 to 5 mm.
is preferred. The porosity defined by the formula below is 5 to 50%
It is preferable that The portion of the resin molded product that has porosity does not need to be the entire molded product, as long as at least a portion thereof has this property. The porosity here is defined by the following formula. Porosity (%) = Density of resin composition - Density of porous molded material / Density of resin composition x 100 If the extraction solvent attached to the molded material is a low boiling point solvent, no special drying process is required. This can be carried out by natural drying, but if necessary, a drying step may be provided to perform the drying treatment. If it is necessary to make the surface of the formed product hydrophilic depending on the application, it is also possible to make the surface hydrophilic by performing corona treatment, plasma treatment, oxidizing agent treatment, or surfactant treatment after the above steps. . Further, the maximum pore diameter of the molded product is preferably 15 μm or less. The maximum pore size is measured by diluting a solution of polystyrene latex with uniform particle size [Uniform Latex Particles, manufactured by Dow Chemical Company] to a solid content of 0.1wt%.
ml is passed through and the capture efficiency is determined by the formula below. Capture efficiency (%) = C _F - C _P / C _F × 100 C _F : Latex concentration of the stock solution C _P : Latex concentration of the liquid that has passed through the porous body Find the capture efficiency from latex with a small particle size and calculate this value. The particle size when it reaches 100% for the first time is the maximum pore size of the molded product. Furthermore, when the molded product according to the present invention was observed using a scanning electron microscope, it was found that micropores were present on the surface.
The cross section is composed of an aggregate of crystalline thermoplastic resin spherulites and inorganic fibrous fillers, and has a structure similar to a sintered body made of ultrafine particles, with many curved paths. It was observed that The resin molded product of the present invention obtained by the above-described method of the present invention and having the above-described micropores generally has the following product properties, and is useful for many of the above-mentioned packaging materials. . That is, for example, a molded product injection molded into a pipe shape with an inner diameter of 14 mm and a wall thickness of 1 mm has a compressive strength of 2 kg or more in the direction perpendicular to the axis, an air permeability of 1 ml/cm ² ·min or more, and a water resistance of 1 kg/cm 2 min. ^cm2 . [Examples] The present invention will be explained in more detail below using Examples and Comparative Examples. The physical properties of the resin molded products shown in the examples were measured by the following method. Shape of molded product: A pipe shape with an outer diameter of 14 mm, wall thickness of 1 mm, and length of 26 mm was molded using an injection mold. This was extracted and used as a sample. Air permeability: 0.8Kg/cm ² from one side when both ends of the above sample are closed.
Clean compressed air was introduced, the air that permeated through the thick side wall was collected in water, its volume was measured, and the air permeability was determined using the formula below. Air permeability = permeated air volume (ml) / time (min) x surface area of sample (cm ² ) Water pressure resistance: Close both ends of the sample above and fill the inside of the sample with water.
High-pressure air of 1 kg/cm ² was applied from one side, and the presence or absence of water leaking from the side of the molded product was visually confirmed. Compressive strength: The breaking strength was measured when the above sample was pressed perpendicularly to the axis with a round rod having a diameter of 10 mm. Dimensional shrinkage rate: The change in length of the sample before and after the extraction process was measured, and the dimensional shrinkage rate was determined from the following formula. Dimensional shrinkage rate (%) = Length before extraction - Length after extraction / Length before extraction x 100 Example 1 100 parts by weight of polypropylene with MI = 20 (manufactured by Chitsuso Corporation, "K-1800"), Aspect ratio: 20
70 parts by weight of calcium metasilicate needle crystals (“NYAD-G” manufactured by NYCO), liquid paraffin with an initial boiling point of 286°C (“KP-15” manufactured by Idemitsu Kosan Co., Ltd.) 85
Parts by weight were mixed and kneaded in a twin-screw extruder, cooled in water, and pellets were prepared. Next, molding was performed using an injection molding machine with the cylinder temperature adjusted to 190°C. At this time, the mold temperature was adjusted to 90°C±5°C using a temperature controller. After releasing the mold, the molded product was soaked in trichlorotrifluoroethane (“Fronsolve” manufactured by Asahi Glass Co., Ltd.) for 3
The sample was immersed with stirring for a minute, then transferred to fresh trichlorotrifluoroethane, and the same operation was repeated three times to extract and remove liquid paraffin, followed by drying in an oven at 40°C for 10 minutes. Table 3 shows the physical properties of the obtained molded product. Comparative Example 1 100 parts by weight of polypropylene with MI = 20 (manufactured by Chitsuso Corporation, "K-1800"), calcium carbonate with an average particle size of 5 μm (manufactured by Nitto Funka Co., Ltd., "NF-
In the same manner as in Example 1, 70 parts by weight of liquid paraffin (manufactured by Idemitsu Kosan Co., Ltd., "KP-15") having an initial boiling point of 286° C., 70 parts by weight of "KP-15") were molded, extracted and dried. Table 3 shows the physical properties of the molded product obtained. Comparative Example 2 100 parts by weight of polypropylene (manufactured by Chitsuso Corporation, "K-1800") with MI = 20, 50 parts by weight of liquid paraffin with an initial boiling point of 286°C ("KP-15", manufactured by Idemitsu Kosan Co., Ltd.)
parts by weight were molded, extracted and dried in the same manner as in Example 1. Table 3 shows the physical properties of the obtained molded product. Comparative Example 3 100 parts by weight of polypropylene (manufactured by Chitsuso Corporation, "K-1800J") with MI = 20, 70 parts by weight of 20 denier polyester fiber monofilament cut into approximately 1 mm length, fluidity with an initial boiling point of 286°C 85 parts by weight of paraffin (manufactured by Idemitsu Kosan Co., Ltd., "KP-15") were mixed and kneaded in the same manner as in Example 1, molded, extracted and dried. Table 3 shows the physical properties of the obtained molded product. Example 4 100 parts by weight of polypropylene with MI=20 (manufactured by Chitsuso Corporation, "K-1800"), aspect ratio: 3
(L/D=3) 70 parts by weight of calcium metasilicate needle crystals (NYAD-1250 manufactured by NYCO), liquid paraffin with an initial boiling point of 286°C (manufactured by Idemitsu Kosan Co., Ltd.,
85 parts by weight of "KP-15") were mixed and kneaded in the same manner as in Example 1, molded, extracted and dried. Table 3 shows the physical properties of the obtained molded product.

【table】

[Table] Examples 2 to 8 Resin compositions having the components and proportions shown in Table 4 were mixed and kneaded using a twin-screw extruder and cooled with water to produce pellets. Thereafter, a molded product was obtained in the same manner as in Example 1 except that the molding conditions and extraction conditions shown in Table 5 were used. Table 6 shows the physical properties of the molded product obtained.

【table】

【table】

【table】

【table】

[Table] [Effects of the invention] As described above, the present invention provides crystalline thermoplastic resins,
After melt-mixing an inorganic fibrous filler and a liquid organic compound, it is molded into an arbitrary shape by injection molding or extrusion molding, and by controlling the cooling temperature at that time, the crystals that appear can be reduced. The size of the spherulites of the crystalline thermoplastic resin is determined, and then treated with a good solvent of a liquid organic compound to remove the liquid organic compound present between the spherulites of the crystalline thermoplastic resin and the inorganic fibrous filler. This method extracts and removes the spherulites of the crystalline thermoplastic resin and creates a space between the spherulites and the inorganic fibrous filler, and uses the communicating pores to allow gas or liquid to pass through. It is a good microporous crystalline thermoplastic resin molded product. Furthermore, since the inorganic fibrous filler is entangled with the spherulites of the crystalline thermoplastic resin, it is possible to obtain a molded product with a small shrinkage rate during the extraction process. Therefore, the resulting products are used to package vaporizable air fresheners, insect repellents, rust preventives, antifungal agents, deodorizers, moisture repellents, deodorants, and other products using various sintered bodies. It can be applied to things that move liquid.

Claims (1)

[Claims] 1. 100 parts by weight of crystalline thermoplastic resin (A), length L,
50 to 200 parts by weight of an inorganic fibrous filler (B) whose L/D is 15 or more when the diameter is D, and which is compatible with (A) at a temperature higher than the melting temperature of (A) and which is substantially A liquid organic compound (C) that does not volatilize and has substantial fluidity in the range from room temperature to molding temperature is added to the sum of (A) and (B) by 100%.
A homogeneous resin composition consisting of 20 to 150 parts by weight is molded by injection molding or extrusion molding, and then the molded product is used as a good solvent for (C) and for (A). A resin molded product characterized in that fine communicating pores are formed in the molded product by extracting and removing (C) with a solvent that is a poor solvent. 2. The crystalline thermoplastic resin is selected from the group consisting of polyethylene, polypropylene, poly4-methylpentene-1, polybutene-1, polyamide, polyester, polyvinylidene chloride, polycarbonate, polyacetal, polysulfone, and tetrafluoroethylene-ethylene copolymer. The resin molded article according to claim 1, which is at least one substance or a mixture of two or more substances. 3. The resin according to claim 1 or 2, wherein the inorganic fibrous filler is at least one substance or a mixture of two or more selected from the group of potassium titanate, potassium metasilicate, and magnesium oxide. Molded object. 4 Claims 1 to 4, characterized in that the liquid organic compound has an initial boiling point or boiling point of 180°C or higher
The resin molded article according to any one of Item 3. 5 The liquid organic compound is liquid paraffin, liquid polybutene, naphthenic oil, phthalate ester,
Phosphate ester, fatty acid ester, alkyl epoxy stearate, epoxidized soybean oil, diisodecyl 4/5 epoxytetrahydroxyphthalate,
The resin molding according to any one of claims 1 to 4, which is at least one or two or more selected from the group of chlorinated paraffin, polyester plasticizer, polyethylene glycol, and perfluorocarbon. thing. 6. The resin according to any one of claims 1 to 5, wherein the solvent is at least one or two or more selected from the group of halogenated hydrocarbons, ketones, cyclohexanone, water, and kerosene. Molded object. 7. The resin molded article according to any one of claims 1 to 6, wherein the molded article has a wall thickness of 0.05 to 0.5 mm and a porosity of 5 to 50%. 8. The resin molded article according to any one of claims 1 to 7, wherein the maximum pore diameter of the communicating pores is 15 μm or less. 9. The resin molded article according to any one of claims 1 to 9, wherein the resin molded article has a dimensional shrinkage rate of 5% or less when the liquid organic compound is extracted and removed. 10 100 parts by weight of crystalline thermoplastic resin (A), 50 to 200 parts by weight of inorganic fibrous filler (B) whose L/D is 15 or more, where L is the length and D is the diameter, and (A) A liquid organic compound (C) that is compatible with (A) above the melting temperature of (A), does not substantially volatilize during the molding process, and has substantial fluidity in the range of room temperature to molding temperature is added to (A) and (B). ) the sum of
A homogeneous resin composition consisting of 20 to 150 parts by weight when expressed as 100 parts by weight is molded by injection molding or extrusion molding, and then the molded product is used as a material that is a good solvent for (C) and (A). 1. A method for producing a resin molded product, which comprises forming fine communicating pores in the molded product by extracting and removing (C) with a solvent that is a poor solvent for the resin. 11. The size of the pore diameter of the communicating pores formed by solid-liquid separation from a uniform resin composition by controlling the mold temperature and/or the temperature of the atmosphere through which the molten resin passes during the injection molding process or extrusion molding process. 11. The method for manufacturing a resin molded article according to claim 10, which comprises controlling the following: 12 The crystalline thermoplastic resin is polyethylene, polypropylene, poly4-methylpentene-1, polybutene-1, polyamide, polyester, polyvinylidene chloride, polycarbonate, polyacetal, polysulfone, tetrafluoroethylene-
At least one selected from the group of ethylene copolymers
Claim 10~ which is a species or two or more species.
The method for producing a resin molded article according to any one of Item 11. 13. According to any one of claims 10 to 12, the inorganic fibrous filler is at least one or two or more selected from the group of potassium titanate, potassium metasilicate, and magnesium oxide. A method of manufacturing a resin molded product. 14 The initial boiling point or boiling point of the liquid organic compound is 180℃
Claim 10 characterized by the above
The method for producing a resin molded article according to any one of Items 1 to 13. 15 The liquid organic compound is liquid paraffin, liquid polybutene, naphthenic oil, phthalate ester, phosphate ester, fatty acid ester, alkyl epoxy stearate, epoxidized soybean oil, 4.
5 epoxytetrahydroxyphthalate diisodecyl, chlorinated paraffin, polyester plasticizer,
The method for producing a resin molded article according to any one of claims 10 to 14, wherein the resin molding is at least one or two or more selected from the group of polyethylene glycol and perfluorocarbon. 16 Claim 1, wherein the solvent is at least one or two or more selected from the group of halogenated hydrocarbons, ketones, cyclohexanone, water, and kerosene.
The method for producing a resin molded article according to any one of Items 0 to 15. 17. The method for producing a resin molded article according to any one of claims 10 to 16, wherein the molded article has a wall thickness of 0.05 to 0.5 mm and a porosity of 5 to 50%. 18. The method for producing a resin molded product according to any one of claims 10 to 17, wherein the maximum pore diameter of the communicating pores is 15 μm or less. 19. The method for producing a resin molded article according to any one of claims 10 to 18, wherein the dimensional shrinkage rate when the organic compound is extracted and removed from the resin molded article is 5% or less.