Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
  • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
  • C08G63/60—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds
  • C08G63/605—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds the hydroxy and carboxylic groups being bound to aromatic rings
• • 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
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B15/08—Layered products comprising a layer of metal comprising metal 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
  • B32B15/09—Layered products comprising a layer of metal comprising metal 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 comprising polyesters
• • 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
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
  • C08G69/44—Polyester-amides
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K1/00—Printed circuits
  • H05K1/02—Details
  • H05K1/03—Use of materials for the substrate
  • H05K1/05—Insulated conductive substrates, e.g. insulated metal substrate
  • H05K1/056—Insulated conductive substrates, e.g. insulated metal substrate the metal substrate being covered by an organic insulating layer
• • 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
  • B32B2264/102—Oxide or hydroxide
• • 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
  • B32B2264/104—Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
• • 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
  • B32B2307/206—Insulating
• • 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
  • B32B2307/704—Crystalline
• • 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
  • B32B2457/08—PCBs, i.e. printed circuit boards
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
  • H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
  • H05K2201/0203—Fillers and particles
  • H05K2201/0206—Materials
  • H05K2201/0209—Inorganic, non-metallic particles

Definitions

• the present invention relates to a laminate and a method for manufacturing the same.
• circuit boards are required to easily dissipate heat generated from mounted elements, that is, to have excellent heat dissipation.
• a metal base circuit board having a metal plate, an insulating layer provided thereon, and a circuit pattern provided thereon has been studied.
• the metal base circuit board is obtained by patterning a metal foil from a laminated board having a metal plate, an insulating layer provided thereon, and a metal foil provided thereon (for example, (See Patent Documents 1 to 8).
• an object of the present invention is to provide a laminate having excellent punching workability and bending workability, and to provide a metal base circuit board having excellent punching workability and bending workability.
• the present invention provides a laminate comprising a metal plate obtained by a rolling method, an insulating layer provided on the metal plate and containing a resin, and a metal foil provided on the insulating layer.
• the metal plate has a ten-point average roughness Rz (MD) in a rolling direction and a ten-point average roughness Rz (TD) in a direction perpendicular to the rolling direction on a surface in contact with the insulating layer, respectively.
• a laminated plate which is a metal plate having a size of 4 to 20 ⁇ m and a ratio of Rz (TD) to Rz (MD) (Rz (TD) / Rz (MD)) being 1.5 or less.
• the laminated board which has the process of obtaining the said metal plate by roughening the at least one surface of the raw material metal plate obtained by the rolling method Is also provided.
• the laminate of the present invention is excellent in punching workability and bending workability, and is excellent in heat dissipation.
• the laminated board of this invention is a laminated board which has a metal plate, the insulating layer provided on it, and the metal foil provided on it.
• the metal plate is a metal plate obtained by a rolling method, and at least one of the surfaces has independent 10-point average roughness in the rolling direction and 10-point average roughness in the direction perpendicular to the rolling direction.
• the ratio of the ten-point average roughness in the direction perpendicular to the rolling direction to the ten-point average roughness in the rolling direction (ten-point average roughness in the direction perpendicular to the rolling direction / tenth in the rolling direction).
• a metal plate having a rough surface with a point average roughness of 1.5 or less is used, and lamination is performed so that the rough surface is in contact with the insulating layer. That is, on the surface in contact with the insulating layer of the metal plate, when the ten-point average roughness in the rolling direction is Rz (MD) and the ten-point average roughness in the direction perpendicular to the rolling direction is Rz (TD), Rz (TD) MD) and Rz (TD) are each independently 4 to 20 ⁇ m, and Rz (TD) / Rz (MD) is 1.5 or less.
• Rz (MD) ten-point average roughness in the rolling direction
• TD ten-point average roughness in the direction perpendicular to the rolling direction
• Rz (TD) MD) and Rz (TD) are each independently 4 to 20 ⁇ m
• Rz (TD) / Rz (MD) is 1.5 or less.
• the other surface of the metal plate that is, the surface opposite to the surface in contact with the insulating layer may be a mirror surface or a rough surface, and if it is a rough surface, the surface in contact with the insulating layer
• the ten-point average roughness in the rolling direction and the ten-point average roughness in the direction perpendicular to the rolling direction are each independently 4 to 20 ⁇ m, and the direction perpendicular to the rolling direction with respect to the ten-point average roughness in the rolling direction
• the ten-point average roughness ratio (ten-point average roughness in the direction perpendicular to the rolling direction / ten-point average roughness in the rolling direction) of 1.5 or less may be a rough surface. It may be a rough surface.
• Rz (MD) and Rz (TD) are preferably each independently 4 to 10 ⁇ m, and Rz (TD) / Rz (MD) is preferably 1.2 or less.
• Punching workability and bending workability are further improved.
• the ten-point average roughness of the surface of the metal plate is measured according to JIS B0601: 1994.
• Such a metal plate can be obtained by roughening at least one surface of the raw metal plate obtained by the rolling method uniformly and appropriately so as to be the predetermined rough surface.
• the roughening may be performed on both surfaces or only on one surface, but is preferably performed on both surfaces because the punching workability and bending workability of the laminate are further improved.
• the roughening may be performed by a dry surface roughening method such as blasting or polishing, or by a wet surface roughening method such as anodizing or etching. Among these, it is preferable to roughen the surface by blasting, whereby the punching workability and bending workability of the laminate are further improved.
• the blast treatment is a method of roughening the metal plate by spraying an abrasive such as alumina, steel grains, sand, glass beads or the like onto the metal plate by air pressure or centrifugal force.
• the material of the metal plate include aluminum, iron, and copper, and may be an alloy such as an aluminum alloy or stainless steel. Of these, copper and aluminum alloys are preferred.
• the metal plate may contain a nonmetal such as carbon, and may contain, for example, aluminum combined with carbon.
• the metal plate preferably has a high thermal conductivity, and the thermal conductivity is preferably 60 W ⁇ m ⁇ 1 ⁇ K ⁇ 1 or more.
• the thickness of the metal plate is usually 0.2 mm or more, preferably 0.5 mm or more, and this facilitates improving the heat dissipation of the laminated plate.
• the thickness of a metal plate is 5 mm or less normally, Preferably it is 1.5 mm or less, and it becomes easy to improve the punching workability and bending workability of a laminated board by this.
• the metal plate may have flexibility or may not have flexibility.
• the metal plate may have a single layer structure or a multilayer structure.
• the insulating layer is provided on the metal plate and contains a resin.
• the resin plays a role as an adhesive for bonding the metal plate and the metal foil and a function of flattening the surface of the insulating layer.
• the resin include thermoplastic resins such as polypropylene, polyamide, polyesters other than liquid crystal polyester, liquid crystal polyester, polyphenylene sulfide, polyether ketone, polycarbonate, polyether sulfone, polyphenylene ether, polyether imide; and phenol resin, epoxy resin And thermosetting resins such as polyimide resins and cyanate resins, and two or more of them may be used.
• liquid crystal polyester is preferable because of its high heat resistance and low dielectric loss.
• the liquid crystalline polyester is a polyester that exhibits liquid crystallinity in a molten state, and is preferably a liquid crystalline polyester that melts at a temperature of 450 ° C. or lower.
• the liquid crystal polyester may be a liquid crystal polyester amide, a liquid crystal polyester ether, a liquid crystal polyester carbonate, or a liquid crystal polyester imide.
• the liquid crystal polyester is preferably a wholly aromatic liquid crystal polyester using only an aromatic compound as a raw material monomer.
• a typical example of the liquid crystal polyester is polymerization (polycondensation) of an aromatic hydroxycarboxylic acid, an aromatic dicarboxylic acid, and at least one compound selected from the group consisting of an aromatic diol, an aromatic hydroxyamine, and an aromatic diamine.
• At least one selected from the group consisting of aromatic dicarboxylic acids and aromatic diols, aromatic hydroxyamines and aromatic diamines include a liquid crystal polyester obtained by polymerizing a compound and a liquid crystal polyester obtained by polymerizing a polyester such as polyethylene terephthalate and an aromatic hydroxycarboxylic acid.
• the aromatic hydroxycarboxylic acid, the aromatic dicarboxylic acid, the aromatic diol, the aromatic hydroxyamine, and the aromatic diamine are each independently replaced with a part or all of the polymerizable derivative. Also good.
• Examples of polymerizable derivatives of a compound having a carboxyl group such as aromatic hydroxycarboxylic acid and aromatic dicarboxylic acid include derivatives (esters) obtained by converting a carboxyl group into an alkoxycarbonyl group or an aryloxycarbonyl group, carboxyl Derivatives obtained by converting a group into a haloformyl group (acid halide) and derivatives obtained by converting a carboxyl group into an acyloxycarbonyl group (an acid anhydride) are included.
• polymerizable derivatives of hydroxyl group-containing compounds such as aromatic hydroxycarboxylic acids, aromatic diols and aromatic hydroxyamines include derivatives obtained by acylating hydroxyl groups and converting them into acyloxyl groups (acylated products) ).
• polymerizable derivatives of amino group-containing compounds such as aromatic hydroxyamines and aromatic diamines include derivatives (acylated products) obtained by acylating amino groups and converting them to acylamino groups.
• the liquid crystalline polyester preferably has a repeating unit represented by the following formula (1) (hereinafter sometimes referred to as “repeating unit (1)”), and the repeating unit (1) and the following formula (2)
• Ar 2 and Ar 3 each independently represent a phenylene group, a naphthylene group, a biphenylylene group, or a group represented by the following formula (4).
• X And Y each independently represents an oxygen atom or an imino group (—NH—), and each hydrogen atom in the group represented by Ar 1 , Ar 2 or Ar 3 is independently a halogen atom or an alkyl group. Alternatively, it may be substituted with an aryl group.
• (4) -Ar 4 -Z-Ar 5- Ar 4 and Ar 5 each independently represent a phenylene group or a naphthylene group.
• Z represents an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group, or an alkylidene group.
• halogen atom a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom are mentioned.
• alkyl group examples include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, s-butyl group, t-butyl group, n-hexyl group, 2-ethylhexyl group, Examples thereof include n-octyl group and n-decyl group, and the carbon number thereof is usually 1-10.
• aryl group examples include a phenyl group, an o-tolyl group, an m-tolyl group, a p-tolyl group, a 1-naphthyl group, and a 2-naphthyl group, and the number of carbon atoms is usually 6 to 20. .
• the hydrogen atom is substituted with these groups, the number is usually 2 or less for each of the groups represented by Ar 1 , Ar 2 or Ar 3 , and preferably 1 It is as follows.
• the alkylidene group examples include a methylene group, an ethylidene group, an isopropylidene group, an n-butylidene group, and a 2-ethylhexylidene group, and the number of carbon atoms is usually 1 to 10.
• the repeating unit (1) is a repeating unit derived from a predetermined aromatic hydroxycarboxylic acid.
• the repeating unit (1) includes a repeating unit (1) in which Ar 1 is a p-phenylene group (a repeating unit derived from p-hydroxybenzoic acid), and a repeating unit in which Ar 1 is a 2,6-naphthylene group ( 1) (Repeating unit derived from 6-hydroxy-2-naphthoic acid) is preferred.
• the repeating unit (2) is a repeating unit derived from a predetermined aromatic dicarboxylic acid.
• the repeating unit (2) (repeating unit derived from diphenyl ether-4,4′-dicarboxylic acid) is preferred.
• the repeating unit (3) is a repeating unit derived from a predetermined aromatic diol, aromatic hydroxylamine or aromatic diamine.
• a repeating unit (3) in which Ar 3 is a p-phenylene group (a repeating unit derived from hydroquinone, p-aminophenol or p-phenylenediamine) is preferable.
• the content of the repeating unit (1) is the total amount of all repeating units (the mass equivalent amount of each repeating unit (moles by dividing the mass of each repeating unit constituting the liquid crystal polyester by the formula amount of each repeating unit). Is usually 30 mol% or more, preferably 30 to 80 mol%, more preferably 30 to 60 mol%, still more preferably 30 to 40 mol%.
• the content of the repeating unit (2) is usually 35 mol% or less, preferably 10 to 35 mol%, more preferably 20 to 35 mol%, still more preferably 30 to 35 mol, based on the total amount of all repeating units. %.
• the content of the repeating unit (3) is usually 35 mol% or less, preferably 10 to 35 mol%, more preferably 20 to 35 mol%, still more preferably 30 to 35 mol, based on the total amount of all repeating units. %.
• the content of the repeating unit (1) is increased, the heat resistance, strength and rigidity are likely to be improved. However, if the content is too large, the solubility in a solvent is likely to be lowered.
• the ratio between the content of the repeating unit (2) and the content of the repeating unit (3) is expressed as [content of repeating unit (2)] / [content of repeating unit (3)] (mol / mol). In general, it is 0.9 / 1 to 1 / 0.9, preferably 0.95 / 1 to 1 / 0.95, and more preferably 0.98 / 1 to 1 / 0.98.
• the liquid crystal polyester may have two or more repeating units (1) to (3) independently.
• the liquid crystalline polyester may have repeating units other than the repeating units (1) to (3), and the content thereof is usually 10 mol% or less, preferably with respect to the total amount of all repeating units. 5 mol% or less.
• the liquid crystalline polyester has a repeating unit (3) in which X and / or Y is an imino group as the repeating unit (3), that is, a repeating unit derived from a predetermined aromatic hydroxylamine and / or an aromatic diamine. Having the repeating unit derived from is preferable because it has excellent solubility in a solvent, and it is more preferable that the repeating unit (3) has only the repeating unit (3) in which X and / or Y is an imino group.
• the liquid crystal polyester is preferably produced by melt polymerization of raw material monomers corresponding to the repeating units constituting the liquid crystal polyester, and solid-phase polymerization of the obtained polymer (prepolymer).
• melt polymerization may be carried out in the presence of a catalyst.
• this catalyst include metal compounds such as magnesium acetate, stannous acetate, tetrabutyl titanate, lead acetate, sodium acetate, potassium acetate, and antimony trioxide,
• nitrogen-containing heterocyclic compounds such as 4- (dimethylamino) pyridine and 1-methylimidazole, and nitrogen-containing heterocyclic compounds are preferably used.
• the flow starting temperature of the liquid crystalline polyester is usually 250 ° C. or higher, preferably 250 ° C. to 350 ° C., more preferably 260 ° C. to 330 ° C.
• the flow start temperature is also called flow temperature or flow temperature, and the temperature is raised at a rate of 4 ° C./min under a load of 9.8 MPa (100 kg / cm 2 ) using a capillary rheometer while liquid crystal polyester is used.
• the proportion of the resin in the insulating layer is preferably 30 to 60% by volume, more preferably 35 to 55% by volume. If this ratio is too small, the adhesion between the insulating layer and the metal plate or the metal foil is lowered, or the surface flatness of the insulating layer is lowered.
• the insulating layer preferably further contains at least one inorganic filler selected from the group consisting of aluminum oxide, silicon oxide, boron nitride, and aluminum nitride.
• the inorganic filler By including the inorganic filler in the insulating layer, the heat dissipation of the laminate is improved.
• a surface-treated inorganic filler may be used in order to improve adhesion with a resin and dispersibility in a liquid composition described later.
• Examples of surface treatment agents that can be used for this surface treatment include silane coupling agents, titanium coupling agents, aluminum coupling agents, zirconium coupling agents, long chain fatty acids, isocyanate compounds, and epoxy groups and methoxysilyl groups. And polymers having an amino group or a hydroxyl group.
• the proportion of the inorganic filler in the insulating layer is preferably 40 to 70% by volume, more preferably 45 to 65% by volume. If this ratio is too small, the heat dissipation of the laminate will decrease. On the other hand, if this ratio is too large, the punching workability and bending workability of the laminate will be reduced.
• the insulating layer may contain components other than the resin and the inorganic filler, for example, organic fillers and additives.
• the proportion of the insulating layer in the insulating layer is usually 0 to 10 in total when plural types are included. % By volume.
• organic fillers include cured epoxy resins, crosslinked benzoguanamine resins, and crosslinked acrylic resins.
• additives include leveling agents, antifoaming agents, antioxidants, ultraviolet absorbers, flame retardants, and colorants.
• the insulating layer may contain inorganic fillers other than aluminum oxide, silicon oxide, boron nitride, and aluminum nitride as inorganic fillers, but the proportion of the inorganic fillers is plural. In some cases, the total amount is usually 0 to 10% by volume.
• the metal foil is provided on the insulating layer and faces the metal plate with the insulating layer interposed therebetween.
• the metal foil material include copper and aluminum, and may be an alloy.
• the thickness of the metal foil is usually 10 to 500 ⁇ m.
• Production of the laminated board of the present invention is as follows. (A): First, a laminated intermediate of a metal foil and an insulating layer is produced, and then this laminated intermediate is used as a roughened surface of the metal plate with the insulating layer surface as a bonding surface.
• the insulating layer is preferably formed by applying a liquid composition containing a resin and a solvent to a support and drying (solvent removal) the resulting coating film.
• the laminated intermediate body of the metal foil and insulating layer in said (A) can be manufactured by using metal foil as a support body.
• the laminated intermediate body of the metal plate and insulating layer in said (B) can be manufactured by using a metal plate as a support body.
• a support other than the metal foil and the metal plate as the support for example, a resin film such as a polyester film, a polypropylene film, a fluororesin film, a nylon film, or a polymethylpentene film, the support was formed on the support.
• a laminated intermediate of the metal foil and the insulating layer in (A) can be produced, and the insulating layer formed on the support is
• a laminated intermediate of the metal plate and the insulating layer in (B) can be produced, and the insulating layer formed on the support is removed from the support.
• the insulating film in (C) can be produced.
• the solvent a solvent that can dissolve the resin to be used, specifically, a solvent that can be dissolved at a concentration of 1% by mass or more at 50 ° C.
• solvents include halogenated hydrocarbons such as dichloromethane, chloroform, 1,2-dichloroethane, 1,1,2,2-tetrachloroethane, o-dichlorobenzene; p-chlorophenol, pentachlorophenol, pentafluorophenol Halogenated phenols such as diethyl ether, tetrahydrofuran, 1,4-dioxane, etc .; ketones such as acetone and cyclohexanone; esters such as ethyl acetate and ⁇ -butyrolactone; carbonates such as ethylene carbonate and propylene carbonate; amines such as triethylamine Nitrogen-containing heteroaromatic compounds such as pyridine; nitriles such as acetonitrile and succinonitrile; amides such as N, N-dimethylform
• an aprotic compound particularly a solvent mainly comprising an aprotic compound having no halogen atom, is preferred, and the proportion of the aprotic compound in the entire solvent is:
• the content is preferably 50 to 100% by mass, more preferably 70 to 100% by mass, and still more preferably 90 to 100% by mass.
• an amide such as N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone and the like because the resin is easily dissolved.
• the solvent is preferably a solvent mainly composed of a compound having a dipole moment of 3 to 5 because the resin is easily dissolved, and the ratio of the compound having a dipole moment of 3 to 5 in the entire solvent is Preferably, it is 50 to 100% by mass, more preferably 70 to 100% by mass, and still more preferably 90 to 100% by mass, and a compound having a dipole moment of 3 to 5 is used as the aprotic compound. preferable.
• the solvent which has as a main component the compound whose boiling point in 1 atmosphere is 220 degrees C or less is preferable, and the ratio of the compound whose boiling point in 1 atmosphere in the whole solvent is 220 degrees C or less Is preferably 50 to 100% by mass, more preferably 70 to 100% by mass, and still more preferably 90 to 100% by mass.
• the aprotic compound a compound having a boiling point at 1 atm of 220 ° C. or less is used. It is preferable.
• the content of the resin in the liquid composition is usually 5 to 60% by mass, preferably 10 to 50% by mass, more preferably 15 to 45% by mass with respect to the total amount of the resin and the solvent, and a desired viscosity.
• the liquid composition is preferably prepared by dispersing the inorganic filler and, if necessary, other components in a solution obtained by dissolving the resin and other components, if necessary, in a solvent.
• the inorganic filler may be dispersed in the solution while being pulverized by a ball mill, three rolls, a centrifugal stirrer, a bead mill or the like.
• Examples of the method of applying the liquid composition to the support include a roll coating method, a bar coating method, a screen printing method, a die coater method, and a comma coater method. Plate type).
• the coating film is preferably dried by evaporating the solvent from the coating film.
• drying the coating film formed on the support, and transferring the resulting dried film from the support to the metal foil or metal plate by thermocompression bonding or the like Is preferably performed so that a part of the solvent remains in the dry film.
• the amount of solvent in the dry film is preferably 1 to 25% by mass.
• the drying temperature is usually 50 to 180 ° C, preferably 80 to 150 ° C.
• the dry film formed on the support or the dry film transferred to the metal foil or metal plate is preferably heat-treated when a thermoplastic resin is used as the resin, thereby adjusting its molecular weight and crystallinity. Therefore, an insulating layer having excellent adhesion and thermal conductivity can be obtained.
• the heat treatment is usually performed at 250 to 350 ° C., preferably 270 to 320 ° C. in an inert gas atmosphere such as nitrogen gas.
• an inert gas atmosphere such as nitrogen gas.
• the laminated sheet of the present invention can be obtained by laminating with a metal foil by thermocompression bonding or the like.
• the insulating layer formed on the support is peeled from the support to obtain an insulating film, as described in (C) above, the insulating film is used as a metal plate with the rough surface of the metal plate as a bonding surface.
• the laminate of the present invention can be obtained by sandwiching between metal foils and bonding them together by thermocompression bonding or the like.
• a metal base circuit board is formed by patterning the metal foil from the laminate thus obtained, forming a circuit pattern, and performing a punching process such as a cutting process or a drilling process or a bending process as necessary. Is obtained.
• the patterning of the metal foil is performed, for example, by forming a mask pattern on the metal foil and removing the exposed portion of the metal foil by etching.
• Thickness of the metal plate obtained by the rolling method is a mirror surface (ten-point average roughness in the rolling direction: 1.2 ⁇ m, ten-point average roughness in the direction perpendicular to the rolling direction: 2.4 ⁇ m)
• a metal plate obtained by roughening one surface of a 0 mm aluminum alloy plate by blasting, wherein one surface is a rough surface having the ten-point average roughness shown in Table 1, and the other surface Metal plates (1) to (4) having a thickness of 1.0 mm and having a mirror surface were used.
• the said aluminum alloy plate was used as a metal plate (5) as it was.
• a press machine (“80 ton press” from Aida Engineering Co., Ltd.) under the conditions of a holder pressure of 20 kN, a knockout force of 59 kN, and a press speed of 60 SPN using a total punching die for an aluminum plate
• the presence or absence of chipping of the insulating layer on the cut surface was confirmed with an optical microscope.
• a transistor (“C2233” manufactured by Toshiba Corporation) is attached to this land using solder, and the obtained laminated plate with the transistor is attached to the water cooling device, and the metal plate is connected to the cooling surface of the water cooling device via the silicone grease layer. Set to face each other. Next, the power P of 30 W is supplied to the transistor, the temperature T1 of the transistor and the temperature T2 of the cooling surface of the water cooling device are measured, and the value of the ratio T1-T2 between the temperature T1 and the temperature T2 with respect to the power P (T1-T2) / P was defined as thermal resistance.
• the liquid crystal polyester had a flow start temperature of 270 ° C.
• [Preparation of liquid crystal polyester solution] 2200 g of liquid crystal polyester was added to 7800 g of N, N-dimethylacetamide and heated at 100 ° C. for 2 hours to obtain a liquid crystal polyester solution. The viscosity of this solution was 400 cP.
• Boron nitride and aluminum oxide were added to the liquid crystal polyester solution, and the mixture was stirred for 5 minutes with a centrifugal stirring deaerator to obtain a liquid composition.
• the liquid composition was applied to a polyester film having a thickness of 100 ⁇ m so that the thickness of the coating film was about 90 ⁇ m, and then dried at 100 ° C. for 20 minutes.
• the obtained intermediate laminate of the polyester film and the dried film is passed between a pair of hot rolls heated to 150 ° C., with the copper foil having a thickness of 35 ⁇ m overlapped so that the dried film is in contact with the copper foil.
• the dry film and the copper foil were thermocompression bonded.
• the polyester film was peeled off, and the resulting laminated intermediate of the copper foil and the dried film was heat treated at 290 ° C. for 3 hours to obtain a laminated intermediate of the copper foil and the insulating layer.
• the laminated intermediate body of copper foil and an insulating layer was piled up with the metal plate.
• the metal plate (1) to (4) is used as the metal plate, the rough surface of the metal plate is brought into contact with the insulating layer, and when the metal plate (5) is used as the metal plate, the metal plate One side of the plate was in contact with the insulating layer.
• heat treatment was performed at 340 ° C. for 20 minutes while applying a pressure of 20 MPa, and the insulating layer and the metal plate were thermocompression bonded.
• the obtained laminated plate was evaluated for punching workability and bending workability, and the thermal resistance of the insulating layer was measured and shown in Table 2.

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Laminated Bodies (AREA)
• Polyamides (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Polyesters Or Polycarbonates (AREA)
• Insulated Metal Substrates For Printed Circuits (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=51428445

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (3)

Citations (6)

Family Cites Families (1)

• 2014
  • 2014-02-26 CN CN201480010195.6A patent/CN105075404B/zh active Active
  • 2014-02-26 TW TW103106428A patent/TWI622492B/zh active
  • 2014-02-26 KR KR1020157026239A patent/KR20150122720A/ko not_active Application Discontinuation
  • 2014-02-26 JP JP2015503080A patent/JP6385917B2/ja active Active
  • 2014-02-26 WO PCT/JP2014/055526 patent/WO2014133189A1/ja active Application Filing

Patent Citations (6)

Also Published As

Similar Documents

Legal Events