WO2014125992A1 - 高誘電率材料用樹脂組成物、それを含む成形品、および着色用マスターバッチ - Google Patents
高誘電率材料用樹脂組成物、それを含む成形品、および着色用マスターバッチ Download PDFInfo
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- WO2014125992A1 WO2014125992A1 PCT/JP2014/052757 JP2014052757W WO2014125992A1 WO 2014125992 A1 WO2014125992 A1 WO 2014125992A1 JP 2014052757 W JP2014052757 W JP 2014052757W WO 2014125992 A1 WO2014125992 A1 WO 2014125992A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/307—Other macromolecular compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
- B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/42—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes polyesters; polyethers; polyacetals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/02—2 layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/204—Di-electric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
Definitions
- the present invention relates to a resin composition for a high dielectric constant material suitable for a material that needs to have a high dielectric constant, a molded article including the resin composition, and a coloring masterbatch.
- materials made of a ceramic-containing resin composition have been proposed as surface mount antenna materials having electrodes disposed on their surfaces, which are used in mobile communication devices such as mobile phones.
- a resin composition for example, Patent Document 1 in which spherical dielectric ceramic powder is mixed with a resin material in a ratio of 40 vol% to 70 vol% (volume%) with respect to the composition is disclosed.
- a resin composition composed of ceramic powder and resin has a problem that a high dielectric constant cannot be obtained unless the amount of ceramic powder added is increased, resulting in an increase in specific gravity and inability to reduce the weight of the antenna.
- the resulting molded product is brittle and has a problem in impact resistance.
- Non-Patent Document 1 For the purpose of imparting conductivity to a resin material, mixing of carbon material particles such as graphite and carbon black is generally performed. However, especially for carbon black, when the blending amount is less than the percolation threshold, it is possible to increase the dielectric constant while maintaining insulation, and the frequency dependence of the dielectric constant and their temperature dependence are also examined. (For example, Non-Patent Document 1).
- some means for improving the impact resistance of the resin composition molded product are also known.
- a method of blending an olefin copolymer with a resin is known (see, for example, Patent Document 2).
- PPS polyphenylene sulfide
- a sufficient impact resistance improvement effect is not obtained.
- typical high dielectric constant ceramics such as titanium oxide and alkaline earth metal titanate function as a catalyst to hydrolyze the polycarbonate resin. It was not possible to adopt. This is because there may be a problem that the resin viscosity is greatly reduced in a processing step that requires high heat such as extrusion.
- a resin composition having a high dielectric constant and a low dielectric loss tangent can be obtained by adding a specific amount of specific carbon black to a resin material.
- One embodiment of the present invention is a resin composition containing (A) a resin material and (B) carbon black, wherein (B) the characteristics of the carbon black are specific DBP (dibutyl phthalate) absorption and specific It is characterized by the amount of iodine adsorbed.
- DBP dibutyl phthalate
- a resin composition for a high dielectric constant material containing (A) 40-80% by mass of a resin material and (B) 20-60% by mass of carbon black,
- the carbon black (B) has a DBP absorption amount of 10 to 50 (mL / 100 g) and an iodine adsorption amount of 5 to 40 (mg / g)
- the resin composition for a high dielectric constant material has a dielectric constant of 4 or more and a dielectric loss tangent of 0.05 or less.
- Resin composition for high dielectric constant materials are examples of the present invention.
- the inventors have formulated a specific amount of specific carbon black into a polycarbonate resin, thereby providing a resin composition for a high dielectric constant material having a high dielectric constant, a low dielectric loss tangent, and thermal stability.
- a molded product obtained by molding two colors of this product and a polycarbonate resin solves the above problems, and the present invention has been completed.
- the present invention is as follows.
- Polycarbonate resin (a) and carbon black (b) having a DBP absorption of 10 to 50 (mL / 100 g) and an iodine adsorption of 5 to 40 (mg / g) are contained, and the polycarbonate resin (a ) Content of 40 to 80% by mass and carbon black (b) content of 20 to 60% by mass and polycarbonate resin (D) in two colors Molded product obtained by molding.
- the content of the polycarbonate resin (a) is 50 to 60% by mass
- the content of the carbon black (b) is 40 to 50% by mass.
- the molded product is composed of the resin composition (C) layer for a high dielectric constant material and the polycarbonate resin (D) layer, and the thickness of the polycarbonate resin (D) layer is 0.1 mm to 5 mm [ 8] to [8-6].
- the present invention is as follows. [11] A coloring masterbatch containing (E) carbon black and (F) resin material, wherein the (E) carbon black has a DBP absorption of 10 to 50 (mL / 100 g), ) A coloring masterbatch in which carbon black has an iodine adsorption of 10 to 30 (mg / g). [12] The coloring master batch according to [11], wherein the DBP absorption amount is 25 to 35 (mL / 100 g). [13] The coloring masterbatch according to [11] or [12], wherein the content ratio of the (E) carbon black is 10 to 90% by mass and the content ratio of the (F) resin material is 10 to 90% by mass. .
- the present invention it is possible to provide a resin composition for a high dielectric constant material excellent in dielectric constant, dielectric loss tangent, appearance, and the like, and a molded product including the same.
- a coloring masterbatch that is easy to mass-produce and hardly causes appearance defects in colored resin molded products.
- the fat composition for a high dielectric constant material according to the first aspect of the present invention contains (A) a resin material and (B) carbon black having specific physical properties. (B) Carbon black is characterized by low DBP absorption and low iodine adsorption.
- (A) Resin material As the resin material that becomes the base material of the resin composition for a high dielectric constant material, one having a low dielectric loss tangent is preferable.
- the resin may be either a thermoplastic resin or a thermosetting resin, but a thermoplastic resin capable of injection molding is preferred.
- low density polyethylene low density polyethylene, ultra low density polyethylene, ultra ultra low density polyethylene, high density polyethylene, low molecular weight polyethylene, ultra high molecular weight polyethylene, ethylene-propylene copolymer, polypropylene, acrylonitrile / butadiene / styrene copolymer (ABS resin) ), Modified polyphenylene ether resins such as alloys of polyphenylene ether resins and polystyrene resins, alloys of polyphenylene ether resins and polyamide resins, alloys of polyphenylene ether resins and polyolefin resins, polycarbonate resins, etc. Is mentioned.
- polyester resins typified by polybutylene terephthalate resin and polyethylene terephthalate resin
- polyamide MXD6 engineering plastics such as polyacetal resin, and alloys containing them. It is done.
- high-heat-resistant super engineering plastics such as liquid crystal polymer, polyphenylene sulfide resin, and polyimide resin, and alloys containing these can also be used.
- polycarbonate resins preferred are polycarbonate resins, modified polyphenylene ether resins, polyphenylene sulfide resins, and polycarbonate / ABS alloys, and particularly preferred are polycarbonate resins and polyphenylene ether resins, because they are excellent in moldability and heat resistance.
- It is a modified polyphenylene ether obtained by alloying a polystyrene resin.
- the carbon black used in the present invention has a DBP absorption of 10 to 50 (mL / 100 g) and an iodine adsorption of 5 to 40 (mg / g).
- the DBP absorption amount is 25 to 35 (mL / 100 g)
- the iodine adsorption amount is 10 to 30 (mg / g).
- the amount of DBP absorption is described in JIS K6217-4: 2001, and is expressed as the volume of DBP absorbed per 100 g (mL / 100 g).
- the iodine adsorption amount is described in JIS K6217-1: 2008, and is expressed as an iodine amount (mg / g) adsorbed per unit weight of carbon black. Both are commonly used as indicators of the characteristics of carbon black.
- carbon black exists in a state called an aggregate in which particles are fused, and is conceptually compared to a bunch of grapes.
- the degree of development of this aggregate is called a structure, and the DBP absorption amount is used as an index representing the degree of structure development.
- the iodine adsorption amount is the most representative index for measuring the total specific surface area including the pores of the carbon black particles.
- the percolation threshold is high, the insulating property is maintained, and it is considered that the resin composition can be provided with dielectric properties of high dielectric constant and low dielectric loss tangent.
- the frequency at which the carbon black particles in the resin composition are brought into contact and electrically connected Increases and the dielectric loss tangent increases.
- Carbon black with a developed structure is easier to obtain a resin composition with a higher dielectric constant, but there are problems of dielectric anisotropy due to the direction of the aggregate and an increase in dielectric loss tangent due to percolation. Particularly, it is not suitable for an antenna member.
- Carbon black having a DBP absorption of less than 10 increases the adherence of carbon black particles to the production apparatus during the production of carbon black, making continuous operation difficult (Japanese Patent Laid-Open No. 2011-98995). ). Therefore, it is difficult to stably obtain such carbon black. Moreover, carbon black whose iodine adsorption amount is less than 5 (mg / g) is not sold both in Japan and overseas, and it is difficult to purchase stably.
- the (B) carbon black used in the present invention is not particularly limited as long as it has a specific DBP absorption amount and iodine adsorption amount, and can be appropriately selected according to the purpose.
- oil furnace black produced by incomplete combustion of raw material oil by the oil furnace method
- ketjen black produced by the special furnace method
- acetylene black produced by using acetylene gas as a raw material
- Lamp black manufactured by thermal decomposition thermal black manufactured by pyrolysis of natural gas
- channel black supplemented by bringing a diffusion flame into contact with the bottom surface of the channel steel.
- Commercially available products include furnace black “Asahi # 8” and “Asahi Thermal” (Asahi Carbon Co., Ltd.).
- the surface pH of carbon black may be slightly alkaline or neutral to acidic.
- A When polycarbonate or polyester is used as the resin material, these resins are hydrolyzed by alkali. Tend. Accordingly, (B) carbon black is suitable from neutral to acidic and preferably has a surface pH of 3 to 8.
- the nitrogen adsorption specific surface area (N 2 SA) of (B) carbon black is preferably 5 to 40 m 2 / g, and more preferably 10 to 30 m 2 / g.
- the nitrogen adsorption specific surface area represents the total specific surface area of carbon black, as is the amount of iodine adsorption, and is useful as an indicator of the characteristics of carbon black.
- the nitrogen adsorption specific surface area can be measured according to JIS K6217-2.
- the advantage that the nitrogen adsorption specific surface area of carbon black is in the above range is the same as the iodine adsorption amount, which is preferable in terms of dielectric constant, dielectric loss tangent, and the like.
- the ratio (N 2 SA / IA) between the nitrogen adsorption specific surface area and the iodine adsorption amount is preferably less than 1.3, and more preferably less than 1.1.
- (A) resin material and (B) carbon black are contained in an amount of (A) 40 to 80% by mass and (B) 20 to 60% by mass, respectively.
- (A) 50 to 60% by mass of the resin material and (B) 40 to 50% by mass of carbon black are contained.
- carbon black having the above specific DBP absorption amount and iodine adsorption amount the carbon black particles do not cause percolation within this range, and a resin composition having a high dielectric constant and a low dielectric loss tangent can be obtained.
- characteristics such as dielectric characteristics and percolation threshold theoretically depend on the volume fraction.
- the resin composition for a high dielectric constant material is preferably blended with a heat stabilizer in order to improve thermal stability in a high temperature atmosphere during melt kneading in the production and molding process of the resin composition and when the product is used.
- a heat stabilizer hindered phenol compounds, phosphite compounds, phosphonite compounds, zinc oxide, and the like are preferable.
- additives can be added to the resin composition for high dielectric constant materials as necessary.
- additives include fillers, reinforcing materials, weather resistance improvers, foaming agents, lubricants, fluidity improvers, impact resistance improvers, dyes, pigments, and dispersants.
- both organic and inorganic can be used as a filler or a reinforcing agent.
- glass fiber mica (white mica, black mica, gold mica, etc.), alumina, talc, wollastonite, potassium titanate,
- inorganic substances such as calcium carbonate and silica.
- These are preferably 1 to 100 parts by weight, more preferably 5 to 80 parts by weight, and still more preferably 5 to 60 parts by weight with respect to a total of 100 parts by weight of (A) resin material and specific (B) carbon black. It mix
- white mica and alumina are more preferable because they have an effect of reducing the dielectric loss tangent.
- the blending amount of white mica or alumina is preferably 5 to 100 parts by mass, and more preferably 10 to 50 parts by mass with respect to 100 parts by mass in total of (A) resin material and specific (B) carbon black.
- the impact resistance improver is not particularly limited as long as it is generally blended in a resin composition and can improve the impact resistance.
- SBS styrene-butadiene-styrene
- Styrene-butadiene block polymers such as SEBS (styrene-ethylene-butylene-styrene) and hydrogenated products thereof
- styrene-isoprene systems such as SIS (styrene-isoprene-styrene)
- SEPS styrene-ethylene-propylene-styrene
- From block polymers and their hydrogenated products olefin elastomers, polyester elastomers, silicone rubbers, acrylate rubbers, multilayered polymers including alkyl (meth) acrylate polymers, silicone rubbers and acrylate rubber components
- a vinyl monomer is graft polymerized to the composite rubber Composite rubber-based graft copolymer, and the like made. The blending
- the resin composition for a high dielectric constant material of the present invention contains (A) a resin material and specific (B) carbon black.
- (A) a resin material and specific (B) carbon black are melt-kneaded. It is manufactured through the process of. Moreover, it is also possible to obtain by the method of removing a solvent from the varnish uniformly disperse
- the carbon black (B) used in the present application has a DBP absorption amount of 10 to 50 (mL / 100 g) and an iodine adsorption amount of 5 to 40 (mg / g), but usually exceeds the upper limit of these numerical ranges. Dispersibility in molten resin is better than that of carbon black. Therefore, the resin composition for a high dielectric constant material of the present invention is suitable for production by melt kneading with an extruder.
- melt kneading for example, (A) resin material, (B) carbon black, and, if necessary, the above-mentioned heat stabilizer and additive are blended, and uniform using a Henschel mixer, ribbon blender, V-type blender, etc. After mixing, it can be carried out by heating and kneading in a molten state with a uniaxial or multiaxial kneading extruder, roll, Banbury mixer, Laboplast mill (Brabender) or the like. Instead of mixing and kneading all the components at once, some components can be mixed in advance or supplied in the middle of kneading without being mixed in advance.
- the kneading temperature and kneading time vary depending on the intended resin composition for a high dielectric constant material and the type of kneader, but the kneading temperature is usually 200 to 350 ° C., preferably 220 to 320 ° C., and the kneading time is 20 minutes. The following is preferred. When the temperature exceeds 350 ° C. or 20 minutes, the resin material has a problem of thermal deterioration, which may cause deterioration of physical properties and appearance defects of the molded product.
- the resin composition pellet for the high dielectric constant material thus obtained is a molding method generally used for thermoplastic resins, for example, an injection molding method, an extrusion molding method, a hollow molding method, a thermoforming method, a press molding. It can be formed into a molded article using a method or the like. Among these, the injection molding method is preferable from the viewpoint of productivity and product performance.
- the resin composition for a high dielectric constant material of the present invention can be easily produced.
- the appearance of the injection-molded product is good because it does not have a flow mark or the like, and is suitable for an antenna component.
- the dielectric constant of the resin composition is preferably 4 or more, more preferably 6 or more, still more preferably 8 or more, and particularly preferably 9 or more. This is because the antenna component cannot be made sufficiently small when the dielectric constant is small.
- the upper limit of the dielectric constant is not particularly limited from the viewpoint of miniaturization, but if the dielectric constant is too large, the antenna size becomes too small, so practically it is preferably 30 or less, more preferably 14 or less, and 12 or less. More preferred is 11 or less.
- the smaller the dielectric loss tangent the higher the radio wave emission efficiency from the antenna and the longer the battery, so 0.05 or less is preferable, 0.03 or less is more preferable, and 0.01 or less is particularly preferable.
- an antenna pattern of a conductor is formed on the surface of the molded article.
- an electroless standard for ABS is used.
- a pattern can be easily formed by copper plating or the like.
- the electroless copper plating process usually consists of pretreatment, chemical etching, catalyst addition, activation, and chemical plating processes.
- the formation of fine irregularities due to surface roughening in the chemical etching process is the process of plating metal and resin. It greatly affects the adhesion.
- the carbon black having the specific DBP absorption amount described above has good dispersibility in the resin, it does not bleed out even if the amount is large, and even if the surface is roughened, the carbon black particles are hardly released on the surface of the molded product. Therefore, the adhesiveness of the electroless copper plating with respect to a resin composition becomes favorable.
- A Resin material (a1) Polycarbonate resin Product of Mitsubishi Engineering Plastics Co., Ltd., “Product name: S-3000FN”
- A2 Polyphenylene ether resin Poly (2,6-dimethyl-1,4-phenylene) ether (hereinafter abbreviated as “PPE”); manufactured by Mitsubishi Engineering Plastics Co., Ltd., “trade name: PX100L”, measured in chloroform The intrinsic viscosity at 30 ° C. was 0.47 dl / g.
- HIPS High impact polystyrene resin
- HT478 Product name: HT478 manufactured by Nippon Polystyrene Co., Ltd., weight average molecular weight 200,000, MFR 3.0 g / 10 min (however, measured at 200 ° C. ⁇ 5 kg).
- the resin molded products for high dielectric constants of Examples A1 to A10 not only have excellent properties as a dielectric, but also are easy to manufacture and have an excellent appearance of the molded product.
- the molded articles of Comparative Examples A2 to A7 containing carbon black not specified in the present invention have inferior properties as a dielectric, and in particular increase the dielectric loss tangent. Also, the appearance of the molded product is bad. Furthermore, it can be seen that even when carbon black specified by the present invention is used, the improvement of the dielectric constant is insufficient when the content is small.
- the resin composition according to the first aspect is excellent as a dielectric, and is particularly suitable as a high dielectric constant material used in an antenna member required to have a high dielectric constant and a low dielectric loss tangent. Further, it has excellent mechanical strength, can be easily mass-produced, and has good appearance and plating adhesion. Since the specific gravity of carbon black is smaller than that of ceramic powder, the antenna can be reduced in size and weight. Therefore, the resin composition according to the first aspect is suitable as a material for antenna parts such as a mobile phone.
- the molded product according to the second aspect of the present invention is a resin composition for high dielectric constant materials (C) containing polycarbonate resin (a) and carbon black (b) characterized by low DBP absorption and low iodine adsorption. ) And polycarbonate resin (D).
- a polycarbonate resin serving as a base resin of the resin composition for high dielectric constant material (C) and a polycarbonate resin (as a counterpart material for two-color molding) D).
- a known polycarbonate resin can be employed without any particular limitation.
- Known polycarbonate resins include thermoplastic, aromatic polycarbonate resins, aliphatic polycarbonate resins, and aromatic-aliphatic polycarbonate resins. Of these, aromatic polycarbonate resins are preferred.
- the aromatic polycarbonate resin is generally obtained by reacting an aromatic dihydroxy compound with phosgene or a diester of carbonic acid.
- a compound in which one or more tetraalkylphosphonium sulfonates are bonded to the above aromatic dihydroxy compound, a polymer having a siloxane structure and containing phenolic OH groups at both ends, Oligomers can be used.
- the aromatic polycarbonate resin used in the present invention is preferably a polycarbonate resin derived from 2,2-bis (4-hydroxyphenyl) propane, or 2,2-bis (4-hydroxyphenyl) propane and other aromatics. And a polycarbonate copolymer derived from an aromatic dihydroxy compound. Further, two or more kinds of polycarbonate resins may be used in combination.
- the resin composition for high dielectric constant material (C) contains carbon black in a large amount of 20 to 60% by mass and is required to have a thin moldability. Therefore, the polycarbonate resin (a) as the base resin is preferably a polycarbonate resin having a relatively low viscosity. Specifically, methylene chloride is used as a solvent, and the viscosity average molecular weight converted from the solution viscosity measured at a temperature of 25 ° C. is preferably 15,000 to 25,000.
- the counterpart polycarbonate resin (D) combined with the resin composition for high dielectric constant material (C) can be used without particular limitation as long as it has a molecular weight capable of exhibiting the original impact resistance of the polycarbonate resin. A viscosity average molecular weight of 20,000 to 30,000 is preferred. It is preferable to use a polycarbonate having a viscosity average molecular weight in the above range from the viewpoint of mechanical strength and moldability.
- Carbon black used in the present invention has a DBP absorption of 10 to 50 (mL / 100 g) and an iodine adsorption of 5 to 40 (mg / g).
- the DBP absorption amount is 25 to 35 (mL / 100 g)
- the iodine adsorption amount is 10 to 30 (mg / g).
- the amount of DBP absorption is described in JIS K6217-4: 2001, and is expressed as the volume of DBP absorbed per 100 g (mL / 100 g).
- the iodine adsorption amount is described in JIS K6217-1: 2008, and is expressed as an iodine amount (mg / g) adsorbed per unit weight of carbon black. Both are commonly used as indicators of the characteristics of carbon black.
- carbon black exists in a state called an aggregate in which particles are fused, and is conceptually compared to a bunch of grapes.
- the degree of development of this aggregate is called a structure, and the DBP absorption amount is used as an index representing the degree of structure development.
- the iodine adsorption amount is the most representative index for measuring the total specific surface area including the pores of the carbon black particles.
- the percolation threshold is high, the insulating property is maintained, and it is considered that the resin composition can be provided with dielectric properties of high dielectric constant and low dielectric loss tangent.
- the frequency at which the carbon black particles in the resin composition are brought into contact and electrically connected Increases and the dielectric loss tangent increases.
- Carbon black with a developed structure is easier to obtain a resin composition with a higher dielectric constant, but there are problems of dielectric anisotropy due to the direction of the aggregate and an increase in dielectric loss tangent due to percolation. Particularly, it is not suitable for an antenna member.
- Carbon black having a DBP absorption of less than 10 increases the adherence of carbon black particles to the production apparatus during the production of carbon black, making continuous operation difficult (Japanese Patent Application Laid-Open No. 2011-98995). . Therefore, it is difficult to stably obtain such carbon black. Moreover, carbon black whose iodine adsorption amount is less than 5 (mg / g) is not sold both in Japan and overseas, and it is difficult to purchase stably.
- the carbon black (b) used in the present invention is not particularly limited as long as it has a specific DBP absorption amount and iodine adsorption amount, and can be appropriately selected according to the purpose.
- oil furnace black produced by incomplete combustion of raw material oil by the oil furnace method
- ketjen black produced by the special furnace method
- acetylene black produced by using acetylene gas as a raw material
- Lamp black manufactured by thermal decomposition thermal black manufactured by pyrolysis of natural gas
- channel black supplemented by bringing a diffusion flame into contact with the bottom surface of the channel steel.
- Commercially available products include furnace black “Asahi # 8” and “Asahi Thermal” (Asahi Carbon Co., Ltd.).
- the nitrogen adsorption specific surface area (N 2 SA) of (b) carbon black is preferably 5 to 40 m 2 / g, and more preferably 10 to 30 m 2 / g.
- the nitrogen adsorption specific surface area represents the total specific surface area of carbon black, as is the amount of iodine adsorption, and is useful as an indicator of the characteristics of carbon black.
- the nitrogen adsorption specific surface area can be measured according to JIS K6217-2.
- the advantage that the nitrogen adsorption specific surface area of carbon black is in the above range is the same as the iodine adsorption amount, which is preferable in terms of dielectric constant, dielectric loss tangent, and the like.
- the ratio (N 2 SA / IA) between the nitrogen adsorption specific surface area and the iodine adsorption amount is preferably less than 1.3, and more preferably less than 1.1.
- the resin composition for high dielectric constant material (C) constituting the molded article of the present invention contains 40-80% by mass of polycarbonate resin (a) and 20-60% by mass of carbon black (b).
- the polycarbonate resin (a) is contained in an amount of 50 to 60% by mass and the carbon black (b) is contained in an amount of 40 to 50% by mass.
- the carbon black particles do not cause percolation within this range, and a resin composition having a high dielectric constant and a low dielectric loss tangent can be obtained.
- characteristics such as dielectric characteristics and percolation threshold theoretically depend on the volume fraction.
- carbon black (b) is contained in an amount of 20 to 60% by mass, the volume fraction corresponds to about 15 to 55% by volume.
- the resin composition for high dielectric constant material (C) constituting the molded article of the present invention improves the thermal stability in a high temperature atmosphere during melt kneading in the production and molding process of the resin composition and when the product is used. Therefore, it is preferable to add a heat stabilizer.
- a heat stabilizer hindered phenol compounds, phosphite compounds, phosphonite compounds, zinc oxide, and the like are preferable.
- additives can be added to the resin composition for high dielectric constant material (C) constituting the molded product of the present invention as necessary.
- additives include fillers, reinforcing materials, weather resistance improvers, foaming agents, lubricants, fluidity improvers, impact resistance improvers, dyes, pigments, and dispersants.
- both organic and inorganic can be used as fillers and reinforcing agents, but usually glass fiber, mica (white mica, black mica, gold mica, etc.), alumina, talc, wollastonite, calcium carbonate, silica
- an inorganic substance such as These are preferably 1 to 100 parts by weight, more preferably 5 to 80 parts by weight, and still more preferably 5 to 60 parts by weight with respect to a total of 100 parts by weight of the polycarbonate resin (a) and the specific carbon black (b). It mix
- white mica and alumina are more preferable because they have an effect of reducing the dielectric loss tangent.
- the amount of white mica or alumina is preferably 5 to 100 parts by mass, and more preferably 10 to 50 parts by mass.
- the counterpart polycarbonate resin (D) combined with the resin composition for high dielectric constant material (C) can contain an elastomer as an impact resistance improver in order to improve impact strength.
- the elastomer is not particularly limited, but a multilayer structure polymer is preferable.
- a multilayer structure polymer the thing containing an alkyl (meth) acrylate type polymer is mentioned, for example.
- These multilayered polymers are, for example, polymers produced by performing multi-stage seed polymerization continuously so that the polymer of the previous stage is sequentially coated with the polymer of the subsequent stage.
- the basic polymer structure is a polymer having an inner core layer that is a crosslinking component having a low glass transition temperature and an outermost core layer made of a polymer compound that improves adhesion to the matrix of the composition.
- a rubber component having a glass transition temperature of 0 ° C. or lower is selected as a component that forms the innermost core layer of these multilayer polymers.
- These rubber components include rubber components such as butadiene, rubber components such as styrene / butadiene, rubber components of alkyl (meth) acrylate polymers, polyorganosiloxane polymers and alkyl (meth) acrylate polymers. Or a rubber component using these in combination.
- examples of the component that forms the outermost core layer include an aromatic vinyl monomer, a non-aromatic monomer, or a copolymer of two or more thereof.
- aromatic vinyl monomer examples include styrene, vinyl toluene, ⁇ -methyl styrene, monochloro styrene, dichloro styrene, bromo styrene and the like. Of these, styrene is particularly preferably used.
- non-aromatic monomers examples include alkyl (meth) acrylates such as ethyl (meth) acrylate and butyl (meth) acrylate, vinyl cyanide such as acrylonitrile and methacrylonitrile, and vinylidene cyanide.
- the two-color molded product may be warped due to a difference in shrinkage from the counterpart material.
- an inorganic filler can be blended with the polycarbonate resin (D) as the counterpart material.
- the resin composition for high dielectric constant material (C) constituting the molded article of the present invention contains a polycarbonate resin (a) and a specific carbon black (b).
- the polycarbonate resin (a) and a specific carbon black (b) It is manufactured through a step of melt-kneading carbon black (b).
- Carbon black (b) used in the present invention has a DBP absorption amount of 10 to 50 (mL / 100 g) and an iodine adsorption amount of 5 to 40 (mg / g), which exceeds the upper limit of these numerical ranges. Dispersibility in molten resin is better than that of ordinary carbon black. Therefore, it is suitable for manufacturing by melt kneading with an extruder. Since carbon black does not function as a hydrolysis catalyst for polycarbonate resin, the polycarbonate resin does not decompose even at high temperatures during melting, and the thermal stability is good.
- melt kneading for example, carbon black (b) is added to polycarbonate resin (a), and heat stabilizers and additives as described above are blended as necessary, and uniform using a Henschel mixer, ribbon blender, V-type blender, etc. After mixing, it can be carried out by heating and kneading in a molten state with a uniaxial or multiaxial kneading extruder, roll, Banbury mixer, Laboplast mill (Brabender) or the like. Instead of mixing and kneading all the components at once, some components can be mixed in advance or supplied in the middle of kneading without being mixed in advance.
- the kneading temperature and kneading time vary depending on the intended high dielectric constant material resin composition (C), the type of kneading machine, etc., but the kneading temperature is usually 200 to 350 ° C., preferably 220 to 320 ° C., kneading time. Is preferably 20 minutes or less. When the temperature exceeds 350 ° C. or 20 minutes, the resin material has a problem of thermal deterioration, which may cause deterioration of physical properties and appearance defects of the molded product. Thus, the pellet of the resin composition (C) for high dielectric constant materials is obtained.
- the molded product of the present invention is obtained by molding the above-described resin composition for high dielectric constant material (C) and polycarbonate resin (D) in two colors. Two-color molding is performed by injection molding the other material as a secondary material on the surface layer of a molded product of a primary material made of one of the resin composition for high dielectric constant material (C) or the polycarbonate resin (D).
- a mold having a cavity with a length of 100 mm, a width of 100 mm, and a thickness of 1.5 mmt is used, and the resin composition for high dielectric constant material (C) is injection molded as a primary material.
- the molded body obtained by the above method is inserted into the mold, and then polycarbonate resin (D) is injection molded as a secondary material.
- polycarbonate resin (D) is injection molded as a secondary material.
- a polycarbonate resin (D) as a primary material and a resin composition (C) for a high dielectric constant material as a secondary material.
- the primary material may be an extruded product or a product obtained by thermoforming and molding the primary material. These molding conditions are not particularly limited as long as the resin does not deteriorate.
- the two-color molded product is a laminate including a layer of a resin composition for high dielectric constant material (C) and a layer of polycarbonate resin (D). Since the layer of polycarbonate resin (D) has a role to bear impact resistance, it is preferable that the molded product has a layer thickness of 0.1 mm or more. Moreover, even if it is too thick, the Charpy impact value may decrease. Therefore, the thickness of the layer is preferably 0.1 to 5 mm.
- the molded product of the present invention can be easily manufactured.
- the appearance of the injection-molded product is also good for an antenna component because it has no flow mark or the like and is good.
- the antenna circuit is formed on the resin composition for high dielectric constant material (C) side of the two-color molded product. Since the dielectric characteristics required for the resin material for antenna use need only be in the vicinity of the antenna circuit, a polycarbonate resin (C having a high dielectric constant is not provided on the opposite side of the resin composition (C) layer for the high dielectric constant material. ) The layer does not affect the antenna performance.
- the dielectric constant of the high dielectric constant material resin composition (C) is preferably 4 or more, more preferably 6 or more, still more preferably 8 or more, and 9 or more. It is particularly preferred. This is because the antenna component cannot be made sufficiently small when the dielectric constant is small.
- the upper limit of the dielectric constant is not particularly limited from the viewpoint of miniaturization, but if the dielectric constant is too large, the antenna size becomes too small, so practically it is preferably 30 or less, more preferably 14 or less, and 12 or less. More preferred is 11 or less.
- Example B The second aspect will be described in more detail with reference to examples, but the present invention is not limited thereto. In the following examples, the following components were used.
- Polycarbonate resin Product of Mitsubishi Engineering Plastics Co., Ltd., “Product name: S-3000FN, viscosity average molecular weight 22,000” Carbon black; manufactured by Asahi Carbon Co., Ltd., “trade name: Asahi # 8”, DBP absorption 30 (mL / 100 g), iodine adsorption (AI) 12 (mg / g), nitrogen adsorption specific surface area (N 2 SA) 12 (m 2 / g), N 2 SA / AI 1.0 Thermal stabilizer; Tris (2,4-di-t-butylphenyl) phosphite; Adeka Argus Co., Ltd., "Product name: Adegas Tab 2112"
- the material was stable without bridging, and the operating conditions were also stable without fluctuation of the resin pressure.
- the extruded resin strand could be pelletized using a normal water-cooled tank without using a special mesh belt or other equipment. The following evaluation was performed using the obtained pellets.
- Dielectric properties A pellet of the resin composition for high dielectric constant material (C) is put into an injection molding machine (Toshiba Machine Co., Ltd., IS100F, clamping force 100t), cylinder temperature is 290 ° C to 310 ° C, mold A plate-shaped molded product having a size of 100 mm ⁇ 100 mm ⁇ thickness 3 mm was produced under the condition of a temperature of 100 ° C.
- the dielectric constant and dielectric loss tangent were measured at 1 GHz at room temperature using a material analyzer (manufactured by Agilent, 4291A). The dielectric constant was 9.4 and the dielectric loss tangent was 0.0081.
- Examples B1 to B4 and Comparative Example B1 A polycarbonate resin (S3000-FN) was used as a primary material, and square plates (100 ⁇ 100 mm) having thicknesses of 1 mmt, 1.5 mmt, and 2 mmt were manufactured by injection molding. Using the same polycarbonate resin, a sheet having a thickness of 1 mmt was produced by extrusion molding and cut into a size of 100 ⁇ 100 mm. These four types of primary materials were inserted into a mold having a cavity length of 100 mm, a width of 100 mm, and a thickness of 3 mm.
- Example B1 Using the resin composition for high dielectric constant material (C) as a secondary material, a two-color molded product having a thickness of 3 mmt was obtained by injection molding (Examples B1 to B4). Moreover, the resin composition for high dielectric constant materials (C) was injection-molded into the same mold without inserting a primary material, and a molded product having a thickness of 3 mmt was obtained (Comparative Example B1). Each molded product was evaluated for the following falling ball impact test.
- the resin molded products for the high dielectric constant materials of Examples B1 to B4 are not only excellent in properties as dielectrics, but also easy to manufacture, excellent in appearance of the molded products, and excellent in impact resistance. It turns out that it is goods.
- Comparative Example B1 which is not molded with two colors, is excellent in dielectric characteristics, but has very low impact characteristics and cannot be said to have sufficient characteristics for applications such as mobile phone devices.
- the molded product according to the second aspect is excellent as a dielectric, and is particularly suitable as a high dielectric constant material used for an antenna member that requires a high dielectric constant and a low dielectric loss tangent. Further, since two-color molding with polycarbonate having excellent impact characteristics is possible, a molded article having improved impact characteristics, which has been a problem in a single resin composition for a high dielectric constant material, is obtained.
- the coloring masterbatch according to the third aspect of the present invention includes (E) carbon black and (F) resin material having specific physical properties.
- (E) Carbon black is characterized by low DBP absorption.
- the carbon black used in the present invention has a DBP absorption of 10 to 50 (mL / 100 g), and preferably a DBP absorption of 25 to 35 (mL / 100 g).
- the amount of DBP absorption is described in JIS K6217-4: 2001, and is expressed as the volume of DBP (dibutyl phthalate) absorbed per 100 g (mL / 100 g), which is commonly used as an indicator of the characteristics of carbon black. ing.
- carbon black exists in a state called an aggregate in which particles are fused, and is conceptually compared to a bunch of grapes.
- the degree of development of this aggregate is called a structure, and the DBP absorption amount is used as an index representing the degree of structure development.
- the DBP absorption amount of carbon black exceeds 50 (mL / 100 g)
- carbon black having a DBP absorption of less than 10 (mL / 100 g) is difficult to continuously operate due to increased adhesion of carbon black particles to the production apparatus during the production of carbon black (Japanese Patent Laid-Open No. 2011-98995). ).
- the (E) carbon black used in the present invention is not particularly limited as long as it has a specific DBP absorption amount, and can be appropriately selected according to the purpose.
- oil furnace black produced by incomplete combustion of raw material oil by the oil furnace method ketjen black produced by the special furnace method, acetylene black produced by using acetylene gas as a raw material, and direct combustion of the raw material in a closed space
- Lamp black manufactured by thermal decomposition thermal black manufactured by pyrolysis of natural gas, and channel black supplemented by bringing a diffusion flame into contact with the bottom surface of the channel steel.
- Commercially available products include furnace black “Asahi # 8” and “Asahi Thermal” (Asahi Carbon Co., Ltd.).
- the iodine adsorption amount is another index of the shape of carbon black.
- the measurement method is described in JIS K6217-1: 2008, and is expressed as the amount of iodine adsorbed per unit weight (mg / g).
- the iodine adsorption amount is the most representative index indicating the total specific surface area including the pores of the carbon black particles, and has a certain degree of correlation with the DBP absorption amount.
- the carbon black (E) used in the present invention preferably has an iodine adsorption of 10 to 30 (mg / g).
- carbon blacks that are widely used for the purpose of imparting conductivity to the resin composition are preferably those having a large DBP absorption amount or iodine adsorption amount, whereas carbon blacks used in the present invention have a DBP absorption amount that is large. It is characterized in that it is limited to a low range.
- the surface pH of carbon black is somewhat alkaline and neutral to acidic.
- the resin material of the present invention is preferably a thermoplastic resin.
- polyolefin resins such as low density polyethylene, ultra low density polyethylene, ultra ultra low density polyethylene, high density polyethylene, low molecular weight polyethylene, ultra high molecular weight polyethylene, ethylene-propylene copolymer, polypropylene, polystyrene, impact resistance Styrene resins such as polystyrene, acrylonitrile / styrene copolymer (AS resin), acrylonitrile / butadiene / styrene copolymer (ABS resin), alloys of polyphenylene ether resin and polystyrene resin, polyphenylene ether resin and polyamide resin And modified polyphenylene ether resins such as alloys of polyphenylene ether resins and polyolefin resins, polycarbonate resins, and the like.
- AS resin acrylonitrile / styrene copolymer
- ABS resin
- polyester resins typified by polybutylene terephthalate resin and polyethylene terephthalate resin
- polyamide MXD6 engineering plastics such as polyacetal resin, and alloys containing them. It is done.
- high-heat-resistant super engineering plastics such as liquid crystal polymer, polyphenylene sulfide resin, and polyimide resin, and alloys containing these can also be used.
- the resin material can be used substantially without limitation by combining with the specific (E) carbon black.
- the resin material can be used substantially without limitation by combining with the specific (E) carbon black.
- preferred are polycarbonate resin, polystyrene resin, polyamide resin, polyester resin, and polyacetal resin.
- a polycarbonate resin is particularly preferred in that a higher concentration of carbon black can be added.
- Carbon black has high cohesiveness, and aggregates easily form secondary aggregates (agglomerates) due to Van Der Waals force, simple aggregation, adhesion, and entanglement. Even when blended in the resin, the aggregated structure is maintained, and this is considered to be a cause of “scratches” in the molded product.
- a masterbatch containing a high concentration of (E) carbon black has a significantly higher viscosity than the base (F) resin material, and thus it is difficult to give strong kneading that destroys this aggregated structure.
- F As a resin material, low-viscosity materials such as polystyrene, AS resin, and oligomer have been used.
- the resin material (F) has a low viscosity or is a different type from the resin to be colored, the mechanical properties of the resin composition after mixing, etc. It may be reduced. Therefore, it is desirable that the (F) resin material is the same type as the resin to be colored and has the same molecular weight.
- melt viscosity of the resin material (F) used in the present invention is not particularly limited.
- the pressure is preferably 100 to 2000 Pa ⁇ s (280 ° C., 100 / sec).
- the content ratio of (E) carbon black and (F) resin material is not particularly limited, but usually 10 to 90% by mass of (E) carbon black and 10 (F) resin material. ⁇ 90% by mass.
- the carbon masterbatch for coloring is required to contain carbon black at a high concentration and to be able to exist in a dispersed state without aggregation of carbon black particles.
- the minimum structural unit of carbon black is a primary aggregate (aggregate) in which fine particles are deposited. It can be said that the larger the number of fine particles per aggregate, the more developed the structure. Aggregates have a complex structure due to branching, so they have voids and the volume is larger as the carbon black has a well-developed structure. Since DBP oil is taken into voids present in the aggregate, the DBP absorption amount of carbon black is the amount of DBP necessary to fill the voids in the aggregate. Therefore, it is described that the DBP absorption amount is a method for evaluating the degree of development of the structure of carbon black.
- DBP oil equal to or less than the DBP absorption amount when DBP oil equal to or less than the DBP absorption amount is mixed with carbon black, all the added DBP oil is absorbed into the voids, and therefore, it does not become rough. That is, the particles are aggregated and the dispersion state is not good.
- DBP oil more than DBP absorption amount when DBP oil more than DBP absorption amount is added, since a DBP oil fills a space
- a higher concentration masterbatch is desirable because the proportion of the (F) resin material contained in the masterbatch can be reduced and the properties of the resin to be colored are not affected.
- the specific DBP absorption amount (E) carbon black used in the coloring masterbatch of the present invention can be blended with the resin at a high concentration. Therefore, the content ratio of (E) carbon black in the coloring masterbatch of the present invention is preferably 40 to 90% by mass, and more preferably 60 to 90% by mass. In this case, the content ratio of the (F) resin material in the coloring masterbatch is preferably 10 to 60% by mass, and more preferably 10 to 40% by mass.
- the coloring masterbatch of the present invention can be blended with a heat stabilizer in order to improve the thermal stability in a high temperature atmosphere at the time of melt-kneading in the production and molding process of the resin composition or when using the product.
- a heat stabilizer hindered phenol compounds, phosphite compounds, phosphonite compounds, zinc oxide, and the like are preferable.
- the well-known ultraviolet absorber added to a resin composition, the other dye / pigment, an antistatic agent, a flame retardant, a mold release agent, an impact improvement elastomer, etc. can also be mix
- the coloring masterbatch of the present invention contains a specific (E) carbon black and (F) resin material, for example, through a step of melt-kneading the specific (E) carbon black and (F) resin material. Manufactured.
- the carbon black (E) used in the present application has a DBP absorption of 10 to 50 (mL / 100 g), and has better dispersibility in the molten resin than ordinary carbon black exceeding the upper limit of this numerical range. . Therefore, it is suitable for manufacturing by melt kneading with an extruder.
- melt kneading for example, (E) carbon black (F) resin material and, if necessary, heat stabilizers and additives as described above are blended and mixed uniformly with a Henschel mixer, ribbon blender, V-type blender, etc. And then kneading in a molten state by heating with a uniaxial or multiaxial kneading extruder, roll, Banbury mixer, Laboplast mill (Brabender), pressure type kneader or the like.
- some components can be mixed in advance or supplied in the middle of kneading without mixing in advance.
- the kneading temperature and kneading time are usually 200 to 350 ° C., preferably 220 to 320 ° C., and the kneading time is preferably 20 minutes or less.
- the obtained pellet-like masterbatch may be melt-kneaded with the resin to be colored as it is to produce a colored molding material, but after coarsening with a pulverizer or the like according to the properties of the resin to be colored. May be used.
- a lump masterbatch obtained by using a Banbury mixer or a pressure kneader can also be used after coarsening to an appropriate size with a pulverizer or the like in accordance with the properties of the resin to be colored.
- the same resin as described in the above (F) resin material can be used as the base resin of the masterbatch.
- the resin to be colored is preferably the same as the resin material in the master batch.
- a molding material including the coloring masterbatch and a resin to be colored. Using this molding material, it is possible to produce a molded product according to the application.
- Example C The third aspect will be described in more detail with reference to examples, but the present invention is not limited thereto. In the following examples and comparative examples, the following components were used.
- Example C7 Cylinder temperature 270 ° C., screw rotation speed 300 rpm, discharge rate 20 kg / h.
- Comparative Example C2 Since the discharge was not stable, the cylinder temperature was 260 ° C., the screw rotation speed was 300 rpm, and the discharge amount was 2 kg / h.
- Comparative Examples C1 and C3 A master batch could not be manufactured because carbon was ejected from the vacuum vent.
- the coloring master batch was evaluated based on the ease of production during extrusion kneading.
- E Evaluate the ease of masterbatch production according to the following criteria from the situation of the extruder when mixing and kneading carbon black and
- F resin material with a twin screw extruder did. The results are shown in Table 4.
- Easy The motor current is a constant value, there is no fluctuation in the discharge amount, and there is no strand breakage. Although there is some volatilization from the vacuum vent, there is almost no discharge at the outlet, and the strands are not cut. Stable production is possible with almost no maintenance.
- Examples C1 to C7 (Easy) The extrusion characteristics were good, and a stable masterbatch could be produced at a discharge rate of 20 kg / h.
- Examples C8 to C14 As a result of observing the surface state of the molded product, no fuzz was observed. Comparative Example C4: On the surface of the molded product, a large number of bumps that were aggregated carbon black particles were observed.
- the molded product after the Charpy impact strength test includes a ductile fracture (the sample after the test is broken in a state where they are partly connected without separation) and a brittle fracture (the sample after the test is completely Is broken and destroyed. In Examples C8 to C10 and C13, all five tested were ductile fractures, but in Examples C11 to C12 and Comparative Example C4, one of the five tested was brittle fracture.
- the coloring masterbatch according to the third aspect is easily mass-produced, and a large amount of carbon black can be blended. And in the molding material obtained by mixing this coloring masterbatch and resin to be colored, carbon black can be uniformly dispersed. Accordingly, a molded product obtained from such a molding material is less likely to have an appearance defect such as “depression”. Further, a molded product obtained by mixing the coloring masterbatch with the resin to be colored has good impact strength.
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Abstract
Description
従来、携帯電話等の移動体通信機器などに用いられる、表面に電極を配置した表面実装アンテナ用材料として、セラミック含有樹脂組成物からなるものが提案されている。例えば、樹脂材料に球状の誘電体セラミックス粉末を、組成物に対する割合で40vol%~70vol%(体積%)混合した樹脂組成物(例えば特許文献1)などが開示されている。
しかしながら、セラミック粉末と樹脂からなる樹脂組成物は、セラミック粉末の添加量を多くしなければ高誘電率が得られず、結果的に比重が高くなりアンテナの軽量化に対応できないという問題がある。また、そのような樹脂組成物を成形した場合、得られる成形品は脆く、耐衝撃性に問題がある。携帯電話に代表される通信機器への適用の際には、落下衝撃に耐えられるだけの耐衝撃性を強く要求される。
従来、熱可塑性樹脂を黒色に着色する場合、樹脂あるいは樹脂組成物の粉末、ペレットあるいはペレットと粉末との混合物に、粉末あるいは粒状のカーボンブラックを配合し、それを押出機で溶融混練して押出し、切断してペレット状にする方法が広く行われている。しかしながらこのような方法において、カーボンブラックの粉末をそのまま樹脂または樹脂組成物に配合した場合、微粉による作業環境の汚染、ハンドリングの問題、さらに分級あるいは凝集などによるカーボンブラックのブツの発生、後続ロットへの色残り、色混じりなどの問題がある。
本発明の一態様は、(A)樹脂材料と(B)カーボンブラックとを含有する樹脂組成物であって、(B)カーボンブラックの特性が、特定のDBP(ジブチルフタレート)吸収量、かつ特定のヨウ素吸着量であることを特徴とする。これにより、高誘電率材料の用途、特にアンテナ部材用途に適した樹脂組成物を容易に得ることができる。
[1] (A)樹脂材料を40~80質量%及び(B)カーボンブラックを20~60質量%含有する高誘電率材料用樹脂組成物であって、
前記(B)カーボンブラックは、DBP吸収量が10~50(mL/100g)かつヨウ素吸着量が5~40(mg/g)であり、
前記高誘電率材料用樹脂組成物は、誘電率が4以上であり、誘電正接が0.05以下である、
高誘電率材料用樹脂組成物。
[2] 前記(A)樹脂材料を50~60質量%及び前記(B)カーボンブラックを40~50質量%含有し、前記(B)カーボンブラックのDBP吸収量が25~35(mL/100g)かつヨウ素吸着量が10~30(mg/g)である、[1]に記載の高誘電率材料用樹脂組成物。
[3] 前記(B)カーボンブラックは、窒素吸着比表面積が5~40m2/gである[1]又は[2]に記載の高誘電率材料用樹脂組成物。
[4] 前記(B)カーボンブラックは、窒素吸着比表面積とヨウ素吸着量との比が1.3未満である[1]~[3]のいずれかに記載の高誘電率材料用樹脂組成物。
[5] 前記(A)樹脂材料が、ポリカーボネート樹脂、変性ポリフェニレンエーテル樹脂、ポリフェニレンスルフィド樹脂又はポリカーボネート/ABSアロイである[1]~[4]のいずれかに記載の高誘電率材料用樹脂組成物。
[6] 前記(A)樹脂材料が、ポリカーボネート樹脂である[5]に記載の高誘電率材料用樹脂組成物。
[6-1] 前記(B)カーボンブラックは、表面pHが3~8である[1]~[6]のいずれかに記載の高誘電率材料用樹脂組成物。
[7] [1]~[6-1]のいずれかに記載の高誘電率材料用樹脂組成物を含む成形品。
[8] ポリカーボネート樹脂(a)及びDBP吸収量が10~50(mL/100g)かつヨウ素吸着量が5~40(mg/g)であるカーボンブラック(b)を含有し、前記ポリカーボネート樹脂(a)の含有量が40~80質量%、前記カーボンブラック(b)の含有量が20~60質量%である高誘電率材料用樹脂組成物(C)と、ポリカーボネート樹脂(D)とを2色成形して得られる成形品。
[8-1] 前記高誘電率材料用樹脂組成物(C)における、前記ポリカーボネート樹脂(a)の含有量が50~60質量%、前記カーボンブラック(b)の含有量が40~50質量%であり、前記カーボンブラック(b)のDBP吸収量が25~35(mL/100g)かつヨウ素吸着量が10~30(mg/g)である、[8]に記載の成形品。
[8-2] 前記高誘電率材料用樹脂組成物(C)は、誘電率が4以上であり、誘電正接が0.05以下である、[8]又は[8-1]に記載の成形品。
[8-3] 上記[6]に記載の高誘電率材料用樹脂組成物(C)及びポリカーボネート樹脂(D)を2色成形して得られる成形品。
[8-4] 前記カーボンブラック(b)は、窒素吸着比表面積が5~40m2/gである[8]~[8-3]のいずれかに記載の成形品。
[8-5] 前記カーボンブラック(b)は、窒素吸着比表面積とヨウ素吸着量との比が1.3未満である[8]~[8-4]のいずれかに記載の成形品。
[8-6] 前記ポリカーボネート樹脂(a)は、粘度平均分子量が15,000~25,000である[8]~[8-5]のいずれかに記載の成形品。
[9] 前記成形品が前記高誘電率材料用樹脂組成物(C)層及び前記ポリカーボネート樹脂(D)層からなり、該ポリカーボネート樹脂(D)層の厚さが0.1mm~5mmである[8]~[8-6]のいずれかに記載の成形品。
[10] 前記高誘電率材料用樹脂組成物(C)及び/又は前記ポリカーボネート樹脂(D)が、無機充填材を含有する[8]~[9]のいずれかに記載の成形品。
[11] (E)カーボンブラック及び(F)樹脂材料を含有する着色用マスターバッチであって、前記(E)カーボンブラックのDBP吸収量が10~50(mL/100g)であり、前記(E)カーボンブラックのヨウ素吸着量が10~30(mg/g)である着色用マスターバッチ。
[12] 前記DBP吸収量が25~35(mL/100g)である[11]に記載の着色用マスターバッチ。
[13] 前記(E)カーボンブラックの含有割合が10~90質量%、前記(F)樹脂材料の含有割合が10~90質量%である[11]又は[12]に記載の着色用マスターバッチ。
[14] 前記(E)カーボンブラックの含有割合が40~90質量%、前記(F)樹脂材料の含有割合が10~60質量%である[13]に記載の着色用マスターバッチ。
[15] 前記(F)樹脂材料が、ポリカーボネート樹脂、ポリスチレン系樹脂、ポリアミド系樹脂、ポリエステル系樹脂、ポリアセタール系樹脂からなる群から選ばれる1種以上である[11]~[14]のいずれかに記載の着色用マスターバッチ。
[16] 前記樹脂材料が、ポリカーボネート樹脂である[15]に記載の着色用マスターバッチ。
[16-1] 前記(E)カーボンブラックは、表面pHが3~8である[11]~[16]のいずれかに記載の着色用マスターバッチ。
[17] さらに熱安定剤を含有する[11]~[16-1]のいずれかに記載の着色用マスターバッチ。
[18] [11]~[17]のいずれかに記載の着色用マスターバッチと被着色樹脂を含有する成形材料。
本発明の第1態様に係る高誘電率材料用脂組成物は、(A)樹脂材料及び特定の物性を有する(B)カーボンブラックを含有したものである。(B)カーボンブラックはDBP吸収量が低く、ヨウ素吸着量が小さい事を特徴とする。
高誘電率材料用樹脂組成物の基材となる樹脂材料としては、誘電正接が低いものが好ましい。樹脂は熱可塑性樹脂又は熱硬化性樹脂のどちらでもよいが、射出成形が可能な熱可塑性樹脂が好ましい。例えば、低密度ポリエチレン、超低密度ポリエチレン、超超低密度ポリエチレン、高密度ポリエチレン、低分子量ポリエチレン、超高分子量ポリエチレン、エチレン-プロピレン共重合体、ポリプロピレン、アクリロニトリル/ブタジエン/スチレン共重合体(ABS樹脂)等のポリオレフィン系樹脂や、ポリフェニレンエーテル樹脂とポリスチレン系樹脂とのアロイ、ポリフェニレンエーテル樹脂とポリアミド系樹脂とのアロイ、ポリフェニレンエーテル樹脂とポリオレフィン系樹脂とのアロイ等の変性ポリフェニレンエーテル樹脂、ポリカーボネート樹脂などが挙げられる。この他にもポリブチレンテレフタレート樹脂、ポリエチレンテレフタレート樹脂などに代表されるポリエステル樹脂、ポリアミド6、ポリアミド66、ポリアミドMXD6などに代表されるポリアミド樹脂、ポリアセタール樹脂等のエンジニアリングプラスチックスやこれらを含むアロイも挙げられる。また所望により、液晶高分子、ポリフェニレンサルファイド樹脂、ポリイミド樹脂といった高耐熱性のスーパーエンジニアリングプラスチックスやこれらを含むアロイを用いることもできる。
本発明で用いるカーボンブラックは、DBP吸収量が10~50(mL/100g)であり、かつヨウ素吸着量が5~40(mg/g)である。好ましくは、DBP吸収量が25~35(mL/100g)であり、かつヨウ素吸着量が10~30(mg/g)である。DBP吸収量はJIS K6217-4:2001に測定方法が記載されており、100gあたりに吸収されるDBPの容積(mL/100g)で表示される。また、ヨウ素吸着量はJIS K6217-1:2008に測定方法が記載されており、カーボンブラックの単位重量当たりに吸着されるヨウ素量(mg/g)で表示される。ともにカーボンブラックの特性の指標として慣用されている。
また、窒素吸着比表面積とヨウ素吸着量との比(N2SA/IA)は、1.3未満であることが好ましく、1.1未満であることがより好ましい。N2SA/IAが上記範囲であるカーボンブラックを、後述する量で添加することにより、より優れた誘電率、誘電正接を有する樹脂組成物を得ることができる。このような樹脂組成物は、安定した誘電性能を発現することができる。
上記第1の態様を実施例によりさらに詳しく説明するが、本発明はこれらに限定されるものではない。なお、以下の実施例において、各成分として次に示すものを用いた。
(a1)ポリカーボネート樹脂
三菱エンジニアリングプラスチックス株式会社製品、「商品名:S-3000FN」
(a2)ポリフェニレンエーテル樹脂
ポリ(2,6-ジメチル-1,4-フェニレン)エーテル(以下「PPE」と略記する);三菱エンジニアリングプラスチックス株式会社製品、「商品名:PX100L」、クロロホルム中で測定した30℃の極限粘度0.47dl/g。
(a3)ハイインパクトポリスチレン樹脂(以下「HIPS」と略記する)
日本ポリスチレン株式会社製、「商品名:HT478」、重量平均分子量 200,000、MFR 3.0g/10分(但し、200℃×5kgの条件にて測定)。
(b1)旭カーボン株式会社製、「商品名:旭#8」
(b2)旭カーボン株式会社製、「商品名:アサヒサーマル」
(b3)旭カーボン株式会社製、「商品名:旭#15」
(b4)旭カーボン株式会社製、「商品名:旭#35」
(b5)東海カーボン株式会社製、「商品名:シーストTA」
(b6)東海カーボン株式会社製、「商品名:シーストS」
(b7)東海カーボン株式会社製、「商品名:トーカブラック#7270SB」
(b8)東海カーボン株式会社製、「商品名:トーカブラック#7100F」
(c1)テトラキス(2,4―ジ-t-ブチルフェニル)[1、1-ビフェニル]-4,4’-ジイルビスホスフォナイト;チバスペシャルティケミカルズ社製、「商品名:IRGAFAS P-EPQ」
(c2)トリス(2,4-ジ-t-ブチルフェニル)ホスファイト;アデカアーガス(株)社製、「商品名:アデガスタブ2112」
表1と表2に示す割合で、ポリカーボネート樹脂、ポリフェニレンエーテル樹脂、ポリスチレン系樹脂、カーボンブラック及び熱安定剤を配合し、タンブラーミキサーにて均一に混合した。これを二軸押出機(日本製鋼所製、「TEX30α」、スクリュー径30mm、L/D=63)の上流部分に投入し、シリンダー温度265℃、スクリュー回転数400rpmにて溶融混練して樹脂組成物のペレットを製造した。得られたペレットを100℃×4時間乾燥させた後、次の(1)及び(2)の評価を行った。評価結果を表1と表2に示す。
(1)誘電特性
上記の方法で得られた樹脂組成物ペレットを用い、射出成形機(東芝機械株式会社製、IS100F、型締め力100t)にて、シリンダー温度290℃~310℃、金型温度100℃の条件で、100mm×100mm×厚み3mmの板状成形品を製造し、マテリアルアナライザー(アジレント社製、4291A)を用いて室温で1GHzにて誘電率及び誘電正接を測定した。
なお、カーボンブラックを含有しないポリカーボネート単独、及び変性ポリフェニレンエーテル単独の誘電特性を、参考例A1、A2として表2に示す。
上記の方法で得られた樹脂組成物ペレットを用い、射出成形機(東芝機械株式会社製、IS100F、型締め力100t)にて、シリンダー温度290℃~310℃、金型温度100℃の条件で、100mm×100mm×厚み3mmの板状成形品を製造した。得られた成形品に生じるフローマークの外観評価を、目視にて行った。目視による評価は、5点満点の点数(5点:極めて良好、4点:良好、3点:やや良好、2点:やや悪い、1点:悪い)で行った。
実施例A4及び比較例A4の外観評価で用いた板状成形品を用い、標準ABS用無電解銅メッキ条件による前処理、化学エッチング、触媒付加、活性化及び化学メッキの工程で、厚み2μmの銅被膜が形成されたメッキ被覆体を作製した。メッキ被膜の密着性の評価は、JIS-H8504-15(引きはがし試験)にて行った。前記メッキ被覆体において、メッキ被膜上に2mm間隔で縦横方向に、被メッキ体に至る切り込みを入れて、格子状碁盤目25個を形成した。その後、この格子状碁盤目に、JIS Z1522の規定を満たすニチバン株式会社製セロハンテープCT-18を貼って勢い良く剥離した。メッキ被膜表面に残存した前記碁盤目の個数を計数することにより、テープ剥離による被膜残存率を評価した。
本発明の第2態様に係る成形品は、ポリカーボネート樹脂(a)及びDBP吸収量が低くヨウ素吸着量が小さい事を特徴とするカーボンブラック(b)を含む高誘電率材料用樹脂組成物(C)とポリカーボネート樹脂(D)との2色成形品である。
本発明の成形品では、高誘電率材料用樹脂組成物(C)のベース樹脂となるポリカーボネート樹脂(a)と、2色成形の際に複合する相手材としてのポリカーボネート樹脂(D)がある。いずれも、特段の制限なく公知のポリカーボネート樹脂を採用することが可能である。公知のポリカーボネート樹脂としては、熱可塑性の、芳香族ポリカーボネート樹脂、脂肪族ポリカーボネート樹脂、芳香族-脂肪族ポリカーボネート樹脂を挙げられるが、中でも芳香族ポリカーボネート樹脂が好ましい。該芳香族ポリカーボネート樹脂は、芳香族ジヒドロキシ化合物をホスゲンまたは炭酸のジエステルと反応させることによって得るのが一般的である。
本発明で用いるカーボンブラックは、DBP吸収量が10~50(mL/100g)であり、かつヨウ素吸着量が5~40(mg/g)である。好ましくは、DBP吸収量が25~35(mL/100g)であり、かつヨウ素吸着量が10~30(mg/g)である。DBP吸収量はJIS K6217-4:2001に測定方法が記載されており、100gあたりに吸収されるDBPの容積(mL/100g)で表示される。また、ヨウ素吸着量はJIS K6217-1:2008に測定方法が記載されており、カーボンブラックの単位重量当たりに吸着されるヨウ素量(mg/g)で表示される。ともにカーボンブラックの特性の指標として慣用されている。
上記第2の態様を実施例によりさらに詳しく説明するが、本発明はこれらに限定されるものではない。なお、以下の実施例において、各成分として次に示すものを用いた。
カーボンブラック ; 旭カーボン株式会社製、「商品名:旭#8」、DBP吸収量 30(mL/100g)、ヨウ素吸着量(AI) 12(mg/g)、窒素吸着比表面積(N2SA) 12(m2/g)、N2SA/AI 1.0
熱安定剤 ; トリス(2,4-ジ-t-ブチルフェニル)ホスファイト;アデカアーガス(株)社製、「商品名:アデガスタブ2112」
ポリカーボネート樹脂(S-3000FN)6kg、カーボンブラック(旭#8)4kg及び熱安定剤(アデガスタブ2112)3g配合し、タンブラーミキサーにて均一に混合した。これを二軸押出機(日本製鋼所製、「TEX30α」、スクリュー径30mm、L/D=63)の上流部分に投入し、シリンダー温度265℃、スクリュー回転数400rpmにて溶融混練して高誘電率材料用樹脂組成物(C)のペレットを製造した。原料供給口では、材料がブリッジなどすることなく安定しており、運転条件も樹脂圧力が変動することなく安定していた。押し出された樹脂ストランドは、特別なメッシュベルトなどの設備を使うことなく、通常の水冷槽を利用してペレタイズすることができた。得られたペレットを用い、以下の評価を行った。
高誘電率材料用樹脂組成物(C)のペレットを射出成形機(東芝機械株式会社製、IS100F、型締め力100t)に投入し、シリンダー温度290℃~310℃、金型温度100℃の条件で、100mm×100mm×厚み3mmの板状成形品を製造した。マテリアルアナライザー(アジレント社製、4291A)を用いて、室温で1GHzにて、誘電率及び誘電正接を測定した。誘電率は9.4、誘電正接は0.0081であった。
高誘電率材料用樹脂組成物(C)のペレットを射出成形機(東芝機械株式会社製、IS100F、型締め力100t)に投入し、シリンダー温度290℃~310℃、金型温度100℃の条件で、100mm×100mm×厚み3mmの板状成形品を製造した。得られた成形品に生じるフローマークの外観評価を、目視にて行った。評価は5点満点(5点:極めて良好、4点:良好、3点:やや良好、2点:やや悪い、1点:悪い)で行い、5点であった。
一次材としてポリカーボネート樹脂(S3000-FN)を用い、射出成形で厚さ1mmt、1.5mmt及び2mmtの角板(100×100mm)を製造した。同じポリカーボネート樹脂を用いて、押出成形により厚み1mmtのシートを製造し、100×100mmの大きさにカットした。これら4種類の厚みの一次材を、キャビティー長さ100mm、幅100mm、厚さ3mmtである金型にインサートした。二次材として上記高誘電率材料用樹脂組成物(C)を用い、射出成形にて厚さ3mmtの2色成形品を得た(実施例B1~B4)。また、同じ金型に、一次材をインサートせずに高誘電率材料用樹脂組成物(C)を射出成形して、厚さ3mmtの成形品を得た(比較例B1)。各成形品につき、下記の落球衝撃試験評価を行った。
JIS K7211に基づいて行った。2色成形品の高誘電率材料用樹脂組成物(C)側の面を鉄球が衝突する面として試験を実施し、ステアケース法の計算を用いて50%衝撃破壊エネルギーE50を計算して、2色成形品の衝撃特性を評価した。結果を表3に示す。
本発明の第3態様に係る着色用マスターバッチは、特定の物性を有する(E)カーボンブラックおよび(F)樹脂材料を含む。(E)カーボンブラックは、DBP吸収量が低いことを特徴とする。
本発明で用いるカーボンブラックは、DBP吸収量が10~50(mL/100g)であり、好ましくはDBP吸収量が25~35(mL/100g)である。DBP吸収量はJIS K6217-4:2001に測定方法が記載されており、100gあたりに吸収されるDBP(ジブチルフタレート)の容積(mL/100g)で表示され、カーボンブラックの特性の指標として慣用されている。
本発明の樹脂材料は、熱可塑性樹脂であることが望ましい。例えば、低密度ポリエチレン、超低密度ポリエチレン、超超低密度ポリエチレン、高密度ポリエチレン、低分子量ポリエチレン、超高分子量ポリエチレン、エチレン-プロピレン共重合体、ポリプロピレンなどのポリオレフィン系樹脂や、ポリスチレン、耐衝撃性ポリスチレン、アクリロニトリル/スチレン共重合体(AS樹脂)、アクリロニトリル/ブタジエン/スチレン共重合体(ABS樹脂)などのスチレン系樹脂、ポリフェニレンエーテル樹脂とポリスチレン系樹脂とのアロイ、ポリフェニレンエーテル樹脂とポリアミド系樹脂とのアロイ、ポリフェニレンエーテル樹脂とポリオレフィン系樹脂とのアロイ等の変性ポリフェニレンエーテル樹脂、ポリカーボネート樹脂などが挙げられる。この他にもポリブチレンテレフタレート樹脂、ポリエチレンテレフタレート樹脂などに代表されるポリエステル樹脂、ポリアミド6、ポリアミド66、ポリアミドMXD6などに代表されるポリアミド樹脂、ポリアセタール樹脂等のエンジニアリングプラスチックスやこれらを含むアロイも挙げられる。また所望により、液晶高分子、ポリフェニレンサルファイド樹脂、ポリイミド樹脂といった高耐熱性のスーパーエンジニアリングプラスチックスやこれらを含むアロイを用いることもできる。
また必要に応じて樹脂組成物に添加される公知の紫外線吸収剤、その他の染顔料、帯電防止剤、難燃剤、離形剤や衝撃改良用エラストマーなどを配合することもできる。
得られたペレット状のマスターバッチは、そのまま被着色樹脂と溶融混練して、着色された成形材料を製造してもよいが、被着色樹脂の性状に合わせて粉砕機などで粗粒子化してから使用してもよい。バンバリーミキサーや加圧ニーダーを利用して得られた塊状のマスターバッチも、被着色樹脂の性状に合わせて粉砕機などで適切なサイズに粗粒子化してから使用することができる。
上記第3の態様を実施例によりさらに詳しく説明するが、本発明はこれらに限定されるものではない。なお、以下の実施例、比較例において、各成分として次に示すものを用いた。
(e1)旭カーボン株式会社製、「商品名:旭#8」、DBP吸収量 30(mL/100g)、PH=7.5、ヨウ素吸着量12(mg/g)
(e2)三菱化学株式会社製、「商品名:MA600」、DBP吸収量 115(mL/100g)、PH=7、ヨウ素吸着量40(mg/g)
(f1)ポリカーボネート樹脂
三菱エンジニアリングプラスチックス株式会社製品、「商品名:H-4000FN」
粘度平均分子量16000、溶融粘度250Pa・s(280℃、100/sec)
(f2)ポリカーボネート樹脂
三菱エンジニアリングプラスチックス株式会社製品、「商品名:S-3000FN」
粘度平均分子量22000、溶融粘度850Pa・s(280℃、100/sec)
(f3)芳香族ポリアミド樹脂
三菱エンジニアリングプラスチックス株式会社製品、「商品名:レニー6001」、
粘度平均分子量17000、溶融粘度100Pa・s(280℃、100/sec)
(g1)ホスファイト系酸化防止剤;アデカアーガス(株)社製、「商品名:アデガスタブ2112」
(g2)ヒンダードフェノール系酸化防止剤;BASFジャパン株式会社、「商品名:イルガノックス1098」
(h1)ポリカーボネート樹脂
三菱エンジニアリングプラスチックス株式会社製品、「商品名:S-3000FN」
粘度平均分子量22000
(h2)ガラス繊維強化芳香族ポリアミド樹脂
三菱エンジニアリングプラスチックス株式会社製品、「商品名:レニー1002H」、
(レニー6001にガラス繊維を30%配合したもの)
表4に示す割合で、カーボンブラック、ポリカーボネート樹脂、ポリアミド樹脂及び熱安定剤を配合し、タンブラーミキサーにて均一に混合した。これを二軸押出機(日本製鋼所製、「TEX30α」、スクリュー径30mm、L/D=63)の最上流部分に投入し、溶融混練により着色用マスターバッチを製造した。押出し混練条件は、以下の通りである。
(実施例C1~C6) : シリンダー温度265℃、スクリュー回転数400rpm、吐出量20Kg/h。
(実施例C7) : シリンダー温度270℃、スクリュー回転数300rpm、吐出量20Kg/h。
(比較例C2) : 吐出が安定しないためシリンダー温度260℃、スクリュー回転数300rpm、吐出量2Kg/hに変更して製造した。
(比較例C1、C3) : 真空ベントよりカーボンが噴出したためマスターバッチを製造できなかった。
(1)マスターバッチ製造容易性
(E)カーボンブラックおよび(F)樹脂材料を混合して2軸押出機で溶融混練する際の押出機の状況から、マスターバッチ製造容易性を下記の規準に従い評価した。結果を表4に示す。
(容易) モーター電流が一定値であり、吐出量変動もなく、ストランドの切断もない。真空ベントからは若干の揮発があるが、吐出口のメヤニもほとんど発生せずに、ストランドが切断されることもない。メンテナンスの必要もほとんどなく、安定した製造が可能な状態。
(困難) 吐出が不安定であり、ストランドが頻繁に切断して、連続的な製造が困難な状況。あるいは吐出口にメヤニが大量に蓄積し、頻繁にメンテナンスする必要がある状況。断続的な製造や、吐出を低下させて少量製造することは可能な状態。
(不可能) 押出機内部で(E)カーボンブラックと(F)樹脂材料の溶融混練がされておらず、真空ベントからカーボンブラックが噴出する。少量でも製造することが出来ない状態。
比較例C2:(困難)吐出20Kg/hではカーボンブラックと樹脂の混練が安定せずに、樹脂ストランドが頻繁に切断した。このため、吐出を2Kg/hまで落としてマスターバッチを製造した。
比較例C1、C3:(不可能)押出機の真空ベントよりカーボンが噴出した。押出条件を調整しても、連続的にストランドを吐出させるのは不可能であった。
実施例C1~C7で得られたマスターバッチM1~M7及び比較例C2で得られたM8と被着色樹脂とを、押出し機で溶融混練して、カーボンブラック配合量が1.0質量%となるように、成形材料を製造した。二軸押出機(日本製鋼所製、「TEX30α」、スクリュー径30mm、L/D=63)を用い、シリンダー温度265℃、スクリュー回転数400rpm、吐出量20Kg/hで、着色ペレットとして成形材料を得た。得られた着色ペレットを射出成形して、(2)成形品外観の評価を行った。結果を表5に示す。また、被着色樹脂がポリカーボネートS-3000FNである場合の実施例C8~C13及び比較例C4について、(3)シャルピー衝撃強度による耐衝撃性評価を行った。結果を表5に示す。
着色ペレットを100℃×4時間乾燥させた。その後、射出成形機(東芝機械株式会社製、IS100F、型締め力100t)にて、シリンダー温度290℃~310℃、金型温度100℃の条件で、100mm×100mm×厚み3mmの板状成形品を製造した。得られた成形品に生じる「ブツ」の外観評価を、目視にて行った。
外観評価は、成形品の表面に斜めに光を当て、カーボンブラック凝集粒子の目立ち方について判定した。目視による評価は、5点満点の点数(5点:極めて良好、4点:良好、3点:やや良好、2点:やや悪い、1点:悪い)で行った。
ISO179-1及び179-2に準拠して行った。上記の方法で得られた着色ペレットを、100℃×4時間乾燥させた。その後、射出成形機(東芝機械株式会社製、IS100F、型締め力100t)にて、シリンダー温度290℃~310℃、金型温度100℃の条件で、10mm×80mm×厚み4mmの試験片を成形した。試験片にノッチを加工し、23℃の温度でシャルピー衝撃強度(kJ/m2)を測定した。
実施例C8~C14:成形品の表面状態を観察した結果、ブツは認められなかった。
比較例C4:成形品の表面には、凝集したカーボンブラック粒子であるブツが多数認められた。
(衝撃強度について)
シャルピー衝撃強度試験後の成形品には、延性破壊(試験後のサンプルが、分離せずに一部つながっている状況で破壊している)のものと、脆性破壊(試験後のサンプルが、完全に分断されて破壊される)のものが存在する。実施例C8~C10、C13は、試験した5本がすべて延性破壊となったが、実施例C11~C12、比較例C4は試験した5本のうち1本が脆性破壊となった。
Claims (18)
- (A)樹脂材料を40~80質量%及び(B)カーボンブラックを20~60質量%含有する高誘電率材料用樹脂組成物であって、
前記(B)カーボンブラックは、DBP吸収量が10~50(mL/100g)かつヨウ素吸着量が5~40(mg/g)であり、
前記高誘電率材料用樹脂組成物は、誘電率が4以上であり、誘電正接が0.05以下である、
高誘電率材料用樹脂組成物。 - 前記(A)樹脂材料を50~60質量%及び前記(B)カーボンブラックを40~50質量%含有し、前記(B)カーボンブラックのDBP吸収量が25~35(mL/100g)かつヨウ素吸着量が10~30(mg/g)である、請求項1に記載の高誘電率材料用樹脂組成物。
- 前記(B)カーボンブラックは、窒素吸着比表面積が5~40m2/gである請求項1又は2に記載の高誘電率材料用樹脂組成物。
- 前記(B)カーボンブラックは、窒素吸着比表面積とヨウ素吸着量との比が1.3未満である請求項1~3のいずれか1項に記載の高誘電率材料用樹脂組成物。
- 前記(A)樹脂材料が、ポリカーボネート樹脂、変性ポリフェニレンエーテル樹脂、ポリフェニレンスルフィド樹脂又はポリカーボネート/ABSアロイである請求項1~4のいずれか一項に記載の高誘電率材料用樹脂組成物。
- 前記(A)樹脂材料が、ポリカーボネート樹脂である請求項5に記載の高誘電率材料用樹脂組成物。
- 請求項1~6のいずれか一項に記載の高誘電率材料用樹脂組成物を含む成形品。
- 請求項6に記載の高誘電率材料用樹脂組成物(C)及びポリカーボネート樹脂(D)を2色成形して得られる成形品。
- 前記成形品が前記高誘電率材料用樹脂組成物(C)層及び前記ポリカーボネート樹脂(D)層からなり、該ポリカーボネート樹脂(D)層の厚さが0.1mm~5mmである請求項8に記載の成形品。
- 前記高誘電率材料用樹脂組成物(C)及び/又は前記ポリカーボネート樹脂(D)が、無機充填材を含有する請求項8又は9に記載の成形品。
- (E)カーボンブラック及び(F)樹脂材料を含有する着色用マスターバッチであって、前記(E)カーボンブラックのDBP吸収量が10~50(mL/100g)であり、前記(E)カーボンブラックのヨウ素吸着量が10~30(mg/g)である着色用マスターバッチ。
- 前記DBP吸収量が25~35(mL/100g)である請求項11に記載の着色用マスターバッチ。
- 前記(E)カーボンブラックの含有割合が10~90質量%、前記(F)樹脂材料の含有割合が10~90質量%である請求項11又は12に記載の着色用マスターバッチ。
- 前記(E)カーボンブラックの含有割合が40~90質量%、前記(F)樹脂材料の含有割合が10~60質量%である請求項13に記載の着色用マスターバッチ。
- 前記(F)樹脂材料が、ポリカーボネート樹脂、ポリスチレン系樹脂、ポリアミド系樹脂、ポリエステル系樹脂、ポリアセタール系樹脂からなる群から選ばれる1種以上である請求項11~14のいずれか一項に記載の着色用マスターバッチ。
- 前記樹脂材料が、ポリカーボネート樹脂である請求項15に記載の着色用マスターバッチ。
- さらに熱安定剤を含有する請求項11~16のいずれか一項に記載の着色用マスターバッチ。
- 請求項11~17のいずれか一項に記載の着色用マスターバッチと被着色樹脂を含有する成形材料。
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| JP2017155106A (ja) * | 2016-02-29 | 2017-09-07 | 三菱エンジニアリングプラスチックス株式会社 | ポリカーボネート樹脂組成物の製造方法 |
| JP2017155107A (ja) * | 2016-02-29 | 2017-09-07 | 三菱エンジニアリングプラスチックス株式会社 | ポリカーボネート樹脂組成物の製造方法 |
| JPWO2017217504A1 (ja) * | 2016-06-17 | 2019-04-11 | 日本電気株式会社 | セルロース系樹脂組成物、成形体及びこれを用いた製品 |
| JP2021001240A (ja) * | 2019-06-19 | 2021-01-07 | Dic株式会社 | 樹脂着色用マスターバッチ、ポリアミド樹脂組成物、成形品およびそれらの製造方法 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017155106A (ja) * | 2016-02-29 | 2017-09-07 | 三菱エンジニアリングプラスチックス株式会社 | ポリカーボネート樹脂組成物の製造方法 |
| JP2017155107A (ja) * | 2016-02-29 | 2017-09-07 | 三菱エンジニアリングプラスチックス株式会社 | ポリカーボネート樹脂組成物の製造方法 |
| JPWO2017217504A1 (ja) * | 2016-06-17 | 2019-04-11 | 日本電気株式会社 | セルロース系樹脂組成物、成形体及びこれを用いた製品 |
| JP2021001240A (ja) * | 2019-06-19 | 2021-01-07 | Dic株式会社 | 樹脂着色用マスターバッチ、ポリアミド樹脂組成物、成形品およびそれらの製造方法 |
| JP7696693B2 (ja) | 2019-06-19 | 2025-06-23 | Dic株式会社 | 樹脂着色用マスターバッチ、ポリアミド樹脂組成物、成形品およびそれらの製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2957602A4 (en) | 2016-09-28 |
| CN104995262A (zh) | 2015-10-21 |
| TWI609906B (zh) | 2018-01-01 |
| US10546665B2 (en) | 2020-01-28 |
| KR102018232B1 (ko) | 2019-09-04 |
| US20200118706A1 (en) | 2020-04-16 |
| EP2957602A1 (en) | 2015-12-23 |
| JP6319287B2 (ja) | 2018-05-09 |
| CN104995262B (zh) | 2019-09-03 |
| US20150380125A1 (en) | 2015-12-31 |
| KR20150118116A (ko) | 2015-10-21 |
| TW201500425A (zh) | 2015-01-01 |
| JPWO2014125992A1 (ja) | 2017-02-02 |
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