WO2014088099A1 - 金属箔張積層板の製造方法 - Google Patents
金属箔張積層板の製造方法 Download PDFInfo
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- WO2014088099A1 WO2014088099A1 PCT/JP2013/082842 JP2013082842W WO2014088099A1 WO 2014088099 A1 WO2014088099 A1 WO 2014088099A1 JP 2013082842 W JP2013082842 W JP 2013082842W WO 2014088099 A1 WO2014088099 A1 WO 2014088099A1
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- metal foil
- clad laminate
- metal
- foil
- heating
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- 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
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0373—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement containing additives, e.g. fillers
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/0007—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B37/1009—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure using vacuum and fluid pressure
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B37/1018—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure using only vacuum
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
- B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
- B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
- B32B37/182—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only one or more of the layers being plastic
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- 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
- H05K1/0271—Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion
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- 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
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- 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/022—Processes for manufacturing precursors of printed circuits, i.e. copper-clad substrates
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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
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/021—Fibrous or filamentary layer
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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
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—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
- 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
- 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
- B32B2307/202—Conductive
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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
- B32B2307/206—Insulating
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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
- B32B2457/08—PCBs, i.e. printed circuit boards
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- 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
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0366—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement reinforced, e.g. by fibres, fabrics
Definitions
- the present invention relates to a method for producing a metal foil-clad laminate using a prepreg produced using a resin composition.
- Patent Document 1 As a method for producing a metal foil-clad laminate for a semiconductor plastic package, generally one or several prepregs are stacked using a multistage vacuum press or an autoclave, and copper or aluminum, etc. on one or both sides as desired. There is a manufacturing method in which a metal foil is arranged and laminated and formed (Patent Document 1). However, when the resin composition is filled with a large amount of inorganic filler in order to reduce the coefficient of thermal expansion of the laminate, this manufacturing method has a drawback that streaky irregularities occur at the voids and the ends of the laminate.
- a prepreg is placed in contact with a metal surface between metal foils, etc., laminated under vacuum while heating and pressing, and then the thermosetting resin in the prepreg is cured in a dryer.
- a method of manufacturing a metal foil-clad laminate has also been proposed (Patent Document 2).
- Patent Document 2 A method of manufacturing a metal foil-clad laminate has also been proposed (Patent Document 2).
- this manufacturing method also has a drawback that air remaining in the prepreg during heating in the dryer is thermally expanded, and the metal foil is expanded and voids are generated.
- the present invention has been made in view of the above problems. That is, the present invention is a metal in which generation of voids and unevenness is suppressed as compared with the conventional case even when a prepreg obtained from a curable resin composition containing a relatively large amount of an inorganic filler is used. It aims at providing the manufacturing method of a foil tension laminated board. Another object of the present invention is to provide a metal foil-clad laminate and the like that are excellent in various properties required as a printed wiring board material, particularly heat resistance and thermal expansion coefficient.
- the present invention provides the following ⁇ 1> to ⁇ 8>.
- ⁇ 1> (A) One or more prepregs are placed in contact with a metal surface between metal foils, and are laminated by heating and pressing in a vacuum state to obtain a metal foil-clad laminate, and (B) the above Lamination molding process for further heating and pressure treatment in a vacuum state on the metal foil-clad laminate, A method for producing a metal foil-clad laminate.
- the heating and pressurizing processes are performed under the conditions of a vacuum degree of 0.001 to 1 kPa, a heating temperature of 50 to 180 ° C., and a pressing pressure of 1 to 30 kgf / cm 2.
- ⁇ 1> The manufacturing method of the metal foil clad laminated board as described in ⁇ 1>.
- the heating and pressurizing treatment is performed under the conditions of a vacuum degree of 0.01 to 6 kPa, a heating temperature of 100 to 400 ° C., and a pressing pressure of 1 to 40 kgf / cm 2.
- ⁇ 1> or ⁇ 2> The manufacturing method of the metal foil tension laminated board as described in ⁇ 2>.
- ⁇ 4> In the bonding step (A), the metal foil-clad laminate according to any one of ⁇ 1> to ⁇ 3>, wherein an adhesive body having a peel strength of 0.01 to 0.1 kN / m is obtained. Production method.
- the heating and pressurizing treatment is performed using any of a multistage press, a multistage vacuum press, or a continuous molding machine, according to any one of ⁇ 1> to ⁇ 4>.
- Method for producing a metal foil-clad laminate ⁇ 6> ⁇ 1> to ⁇ 5>, wherein the prepreg is obtained by impregnating or applying a curable resin composition containing a thermosetting resin (a) and an inorganic filler (b) to a sheet-like fiber base material. The manufacturing method of the metal foil tension laminated board as described in any one of these.
- the production method of the present invention it is possible to stably produce a metal foil-clad laminate in which generation of voids and unevenness is suppressed, and various properties required as a printed wiring board material, particularly heat resistance and A metal foil-clad laminate having excellent thermal expansion coefficient and peel strength can be stably produced.
- the production method of the present invention can effectively suppress the occurrence of voids and unevenness even when a prepreg obtained from a curable resin composition containing a relatively large amount of an inorganic filler is used. .
- (A) one or more prepregs are disposed between metal foils so as to be in contact with the metal surface, and are laminated by heating and pressing in a vacuum state to obtain a metal foil-clad laminate.
- An adhesion process and
- one or more prepregs are placed between metal foils so as to be in contact with the metal surface (bonding), and the prepreg is vacuum laminated on the metal foil by heating and pressing. More specifically, one or more prepregs are disposed between the metal foils so as to be in contact with the metal surface to form a laminate, and the laminate is subjected to heating and pressure treatment in a vacuum state, A metal foil-clad laminate (adhesive) to which the prepreg is bonded is obtained.
- the same prepreg may be used or different prepregs may be used.
- different prepregs those in which one or all of the composition of the curable resin composition, the material of the sheet-like fiber substrate, the thickness of the sheet-like fiber substrate, and the like are different from each other can be used.
- a batch type laminator or a roll type laminator can be used. From the viewpoint of imparting smoothness, a batch type laminator is preferable.
- the heating temperature in the bonding step is not particularly limited, but from the viewpoint of enhancing the adhesion between the metal foil and the prepreg, the heating temperature in the (A) bonding step is preferably 50 ° C or higher, more preferably 60 ° C or higher. 70 ° C. or higher is more preferable, and 80 ° C. or higher is even more preferable.
- the heating temperature in the (A) adhesion step is preferably 180 ° C. or less, more preferably 170 ° C. or less, further preferably 160 ° C. or less, and 150 ° C. or less. Even more preferred.
- the time for the bonding step is not particularly limited, but from the viewpoint of sufficiently flowing the resin, (A) the time for the bonding step is preferably 10 seconds or more, more preferably 15 seconds or more, and 20 seconds or more. More preferred is 25 seconds or more. From the viewpoint of improving productivity, the time for the (A) bonding step is preferably 600 seconds or less, more preferably 500 seconds or less, still more preferably 400 seconds or less, even more preferably 300 seconds or less, and even more preferably 200 seconds or less. Particularly preferred is 100 seconds or less.
- the degree of vacuum in the bonding step is not particularly limited, but from the viewpoint of preventing the entry of air into the laminated plate and preventing the generation of voids, the degree of vacuum in the (A) bonding step is preferably 1 kPa or less. 0.9 kPa or less is more preferable, 0.5 kPa or less is further preferable, 0.4 kPa or less is still more preferable, 0.3 kPa or less is particularly preferable, 0.2 kPa or less is particularly preferable, and 0.1 kPa or less is particularly preferable.
- the lower limit of (A) the vacuum in the bonding step is not particularly limited, but is preferably 0.001 kPa or more.
- the pressure of an adhesion process is not specifically limited, From a viewpoint of making a curable resin composition flow and improving adhesiveness with metal foil, the pressure of (A) adhesion process is 1 kgf / cm ⁇ 2 > or more. Is preferably 3 kgf / cm 2 or more, more preferably 5 kgf / cm 2 or more.
- the pressure of the bonding step is preferably 30 kgf / cm 2 or less, more preferably 25 kgf / cm 2 or less, more preferably 22 kgf / cm 2 or less, still more preferably 20 kgf / cm 2 or less, especially preferably 17 kgf / cm 2 or less, 15 kgf / cm 2 or less is particularly preferred.
- a vacuum laminator can be used as the batch laminator or roll laminator described above.
- Commercially available vacuum laminators include, for example, batch type vacuum pressure laminator MVLP-500 / 600, manufactured by Meiki Seisakusho Co., Ltd., batch type vacuum pressure laminator CVP-600, manufactured by Nichigo Morton, Ltd., Kitagawa Seiki Co., Ltd. Examples thereof include a vacuum laminator manufactured by Hitachi Industries, Ltd., a roll dry coater manufactured by Hitachi Industries, Ltd., and a vacuum laminator manufactured by Hitachi AC Corporation.
- the peel strength of the metal foil with respect to the prepreg is preferably 0.01 to 0.1 kN / m, and more preferably 0.02 to 0.1 kN / m.
- the peel strength of the metal foil means a value measured in accordance with the JIS C6481 test method for copper-clad laminates for printed wiring boards (refer to 5.7 peel strength). The measurement conditions are those described in the examples described later.
- the metal foil-clad laminate (adhesive) obtained in the above-mentioned (A) adhesion step is further subjected to heating and pressure treatment in a vacuum state, thereby achieving the purpose.
- a metal foil-clad laminate is obtained.
- the heating temperature in the laminate molding step is not particularly limited, but from the viewpoint of further improving the adhesion between the metal foil and the prepreg and the resin curability, the heating temperature in the (B) laminate molding step is 100 ° C or higher. Preferably, 120 ° C. or higher is more preferable, 130 ° C. or higher is further preferable, and 150 ° C. or higher is even more preferable.
- the heating temperature in the (B) lamination molding step is preferably 400 ° C. or lower, more preferably 350 ° C. or lower, still more preferably 330 ° C. or lower, and 300 ° C. or lower. Even more preferred.
- the heating temperature of the (B) lamination molding process is higher than the heating temperature of the (A) bonding process described above. In this way, by performing the (B) laminate molding step at a high temperature, a metal foil-clad laminate superior in appearance and various physical properties can be obtained.
- the time of the lamination molding step is not particularly limited, but is preferably 5 minutes or more, more preferably 10 minutes or more, further preferably 20 minutes or more, and more preferably 30 minutes or more from the viewpoint of further improving the resin curability. Even more preferred. Further, from the viewpoint of improving productivity, the time of the (B) lamination molding step is preferably 300 minutes or less, more preferably 280 minutes or less, further preferably 250 minutes or less, even more preferably 240 minutes or less, even more preferably 230 minutes or less. Is more preferable, and 220 minutes or less is particularly preferable.
- the degree of vacuum in the layer forming step is not particularly limited, but is preferably 0.01 kPa or more, more preferably 0.02 kPa or more, from the viewpoint of improving the productivity by reducing the degree of vacuum immediately after the treatment. 0.03 kPa or more is more preferable, and 0.05 kPa or more is even more preferable. Further, from the viewpoint of preventing the entry of air into the laminate and preventing the generation of voids, the degree of vacuum in the (B) laminate molding step is preferably 6 kPa or less, more preferably 5 kPa or less, still more preferably 4 kPa or less, and further 3 kPa. The following is still more preferable, 2 kPa or less is particularly preferable, 1 kPa or less is particularly preferable, and 0.5 kPa or less is particularly preferable.
- the pressure of the lamination molding process is not particularly limited, from the viewpoint of further improving the adhesion between the prepreg and the metal foil is preferably 1 kgf / cm 2 or more, 2 kgf / cm 2 or more is more preferred, 3 kgf / Cm 2 or more is more preferable.
- the pressure of the laminate molding step is preferably 40 kgf / cm 2 or less, more preferably 35 kgf / cm 2 or less , more preferably 33 kgf / cm 2 or less, still more preferably 30 kgf / cm 2 or less, especially preferably 25 kgf / cm 2 or less, 20 kgf / cm 2 or less is particularly preferred.
- the lamination molding step can be performed using various known apparatuses, for example, a laminated board for a printed wiring board or a multilayer board which is usually used. Specific examples thereof include a multistage press, a multistage vacuum press, a continuous molding machine, and an autoclave molding machine.
- the prepreg used in the above-described (A) adhesion step contains a curable resin composition and a sheet-like fiber base material.
- This prepreg can be obtained by impregnating or applying a curable resin composition to a sheet-like fiber base material, and heating and drying as necessary.
- the prepreg curable resin composition preferably contains a thermosetting resin (a) and an inorganic filler (b).
- thermosetting resin (a) is not particularly limited as long as it is a thermosetting resin generally used for printed wiring board materials.
- a thermosetting resin generally used for printed wiring board materials For example, an epoxy resin, a cyanate ester compound, a phenol resin, a maleimide compound, and a BT resin can be used. These can be used alone or in combination of two or more.
- the epoxy resin is not particularly limited as long as it is a compound having two or more epoxy groups in one molecule and having no halogen atom in the molecular skeleton.
- phenol phenyl aralkyl novolak type epoxy resin phenol biphenyl aralkyl type epoxy resin, naphthol aralkyl type epoxy resin, anthraquinone type epoxy resin, poly Oxynaphthylene type epoxy resins are preferred.
- cyanate ester compounds include naphthol aralkyl cyanate ester compounds, novolak cyanate esters, biphenyl aralkyl cyanate esters, bis (3,5-dimethyl 4-cyanatophenyl) methane, and bis (4-cyanato).
- naphthol aralkyl type cyanate ester compounds novolak type cyanate esters, biphenyl aralkyl type cyanate esters are particularly excellent because they have excellent flame retardancy, high curability, and low thermal expansion coefficient of cured products. preferable.
- phenol resin examples include cresol novolak type phenol resin, phenol novolak resin, alkylphenol novolak resin, bisphenol A type novolak resin, dicyclopentadiene type phenol resin, zylock type phenol resin, terpene modified phenol resin, polyvinylphenols, naphthol aralkyl.
- cresol novolac type phenol resins aminotriazine novolac type phenol resins, naphthalene type phenol resins, naphthol aralkyl type phenol resins, and biphenyl aralkyl type phenol resins are preferable.
- a novolak type phenol compound, a naphthol aralkyl type phenol resin, and a biphenyl aralkyl type phenol resin are more preferable.
- the maleimide compound is not particularly limited as long as it is a compound having one or more maleimide groups in one molecule, for example.
- Specific examples thereof include N-phenylmaleimide, N-hydroxyphenylmaleimide, bis (4-maleimidophenyl) methane, 2,2-bis ⁇ 4- (4-maleimidophenoxy) -phenyl ⁇ propane, bis (3,5 -Dimethyl-4-maleimidophenyl) methane, bis (3-ethyl-5-methyl-4-maleimidophenyl) methane, bis (3,5-diethyl-4-maleimidophenyl) methane, polyphenylmethanemaleimide compounds, these maleimides
- a prepolymer of a compound or a prepolymer of a maleimide compound and an amine compound may be mentioned, but the invention is not particularly limited thereto.
- cyanate ester compound and maleimide compound are dissolved in an organic solvent such as methyl ethyl ketone, N-methyl pyrodrine, dimethylformamide, dimethylacetamide, toluene or xylene in a solvent-free state and pre-polymerized. It is a thing.
- the cyanate ester compound and maleimide compound used in the synthesis of the BT resin are not particularly limited, and for example, the above-described cyanate ester compound and maleimide compound can be used.
- the above-described cyanate ester compound and maleimide compound can be used.
- naphthol aralkyl cyanate ester compounds, novolac cyanate ester compounds, and biphenyl aralkyl cyanate esters are used as the cyanate ester compounds.
- the flame retardancy, curability, and low thermal expansion coefficient of the printed circuit boards obtained from the viewpoint of As maleimide compounds, bis (4-maleimidophenyl) methane, 2,2-bis ⁇ 4- (4-maleimidophenoxy) -phenyl ⁇ propane, bis (3-ethyl-5-methyl-4-maleimidophenyl) Methane and polyphenylmethanemaleimide are preferred.
- silicone rubber powder may be added to the thermosetting resin (a) as necessary.
- Silicone rubber powder is a fine powder made of an addition polymer of vinyl group-containing dimethylpolysiloxane and methylhydrogenpolysiloxane. Addition of silicone rubber powder has the effect of reducing thermal expansion.
- the silicone rubber powder has strong cohesiveness and the dispersibility in the curable resin composition may deteriorate, so use a silicone rubber powder whose surface is coated with a silicone resin to improve dispersibility.
- the silicone resin covering the surface is not particularly limited, but polymethylsilsesquioxane in which siloxane bonds are crosslinked in a three-dimensional network is preferable.
- the average particle diameter (D50) of the silicone rubber powder is not particularly limited, but is preferably 0.5 to 15 ⁇ m in consideration of dispersibility.
- D50 is the median diameter (median diameter).
- the amount of silicone rubber powder blended is not particularly limited. From the viewpoint of moldability of the resulting curable resin composition, it is preferably 100 parts by mass or less, particularly 90 parts by mass or less, based on 100 parts by mass of the thermosetting resin (a). Is preferred.
- the minimum of the compounding quantity of silicone rubber powder is not specifically limited, From a viewpoint of expressing low thermal expansion, it is preferable that it is 1 mass part or more, More preferably, it is 3 mass parts or more.
- a curing accelerator can be used in combination with the thermosetting resin (a) as necessary.
- a curing accelerator in combination, the curing rate of the resulting curable resin composition can be appropriately adjusted.
- the curing accelerator used here is not particularly limited as long as it is generally used as a curing accelerator for the thermosetting resin (a). Specific examples thereof include, but are not particularly limited to, organic metal salts such as copper, zinc, cobalt, and nickel, imidazoles and derivatives thereof, and tertiary amines. These can be used alone or in combination of two or more according to the purpose.
- silicone resin powder can be used in combination with the thermosetting resin (a) as a flame retardant aid, if necessary.
- the silicone resin powder used as a flame retardant aid is separate from the silicone resin used in the surface coating of the silicone rubber powder described above.
- the compounding quantity of silicone resin powder is not specifically limited, From a moldable viewpoint, it is preferable that it is 30 mass parts or less with respect to a total of 100 mass parts of thermosetting resin (a), and especially 25 mass parts or less. It is preferable to use in a range.
- the minimum of the compounding quantity of a silicone resin powder is not specifically limited, From a viewpoint of fully expressing the function as a flame retardant adjuvant, it is preferable that it is 1 mass part or more, More preferably, it is 3 mass parts or more. is there.
- thermosetting resin (a) various polymer compounds such as other thermosetting resins, thermoplastic resins and oligomers thereof, and elastomers, as long as the desired characteristics are not impaired as required.
- Other flame retardant compounds and additives can be used in combination. These are not particularly limited as long as they are generally used.
- examples of the flame retardant compound include nitrogen-containing compounds such as melamine and benzoguanamine, and oxazine ring-containing compounds.
- Additives include UV absorbers, antioxidants, photopolymerization initiators, optical brighteners, photosensitizers, dyes, pigments, thickeners, lubricants, antifoaming agents, dispersants, leveling agents, brighteners And polymerization inhibitors. These can be used alone or in combination of two or more according to the purpose.
- Examples of the inorganic filler (b) include, but are not limited to, silica, alumina, mica, mica, silicate, barium sulfate, magnesium hydroxide, titanium oxide, and the like.
- silica and alumina are preferable, and silica such as amorphous silica, fused silica, crystalline silica, synthetic silica, and hollow silica is particularly preferable.
- the silica is preferably spherical. These can be used alone or in combination of two or more according to the purpose. In particular, it is preferable to use fused silica from the viewpoint of reducing the coefficient of thermal expansion.
- the average particle diameter (D50) of the inorganic filler (b) is not particularly limited, but is preferably 5 ⁇ m or less, more preferably 4 ⁇ m or less, further preferably 3 ⁇ m or less, and more preferably 2 ⁇ m or less from the viewpoint of improving the insulation reliability. Even more preferred is 1.5 ⁇ m or less, particularly preferred is 1 ⁇ m or less.
- the lower limit of the average particle diameter (D50) of the inorganic filler (b) is preferably 0.01 ⁇ m or more, more preferably 0.05 ⁇ m or more, and further preferably 0.1 ⁇ m or more from the viewpoint of improving dispersibility. preferable.
- the average particle diameter (D50) is 0.01 as the inorganic filler (b) from the viewpoint of improving the impregnating property of the resin varnish into the sheet-like fiber base material and reducing the linear thermal expansion coefficient of the cured product. It is preferable to use an inorganic filler (b) of ⁇ 0.3 ⁇ m.
- the average particle diameter (D50) of the inorganic filler can be measured by a laser diffraction / scattering method based on the Mie scattering theory.
- the particle size distribution of the inorganic filler can be created on a volume basis by a laser diffraction particle size distribution measuring device, and the median diameter can be measured as the average particle diameter.
- an inorganic filler dispersed in water by ultrasonic waves can be preferably used.
- a laser diffraction type particle size distribution measuring apparatus for example, LA-500 manufactured by Horiba Ltd. can be used.
- the content of the inorganic filler in the curable resin composition is not particularly obtained locally, but from the viewpoint of preventing a decrease in the mechanical strength of the cured product or improving the film thickness uniformity, a thermosetting resin ( 1100 mass parts or less are preferable with respect to a total of 100 mass parts of a), and 1000 mass parts or less are especially preferable.
- the lower limit of the content of the inorganic filler (b) in the curable resin composition is that of the thermosetting resin (a) from the viewpoint of reducing the thermal expansion coefficient or imparting rigidity to the prepreg. 80 parts by mass or more is preferable with respect to 100 parts by mass in total, and 90 parts by mass or more is particularly preferable.
- the inorganic filler (b) described above is preferably treated with a surface treatment agent in order to improve moisture resistance or dispersibility.
- a surface treatment agent used here include aminopropylmethoxysilane, aminopropyltriethoxysilane, ureidopropyltriethoxysilane, N-phenylaminopropyltrimethoxysilane, and N-2 (aminoethyl) aminopropyl trimethoxysilane.
- Aminosilane coupling agents such as glycidoxypropyltrimethoxysilane, glycidoxypropyltriethoxysilane, glycidoxypropylmethyldiethoxysilane, glycidylbutyltrimethoxysilane, (3,4-epoxycyclohexyl) ethyltrimethoxy Epoxysilane coupling agents such as silane, mercaptosilane coupling agents such as mercaptopropyltrimethoxysilane and mercaptopropyltriethoxysilane, methyltrimethoxysilane, Silane coupling agents such as kutadecyltrimethoxysilane, phenyltrimethoxysilane, methacroxypropyltrimethoxysilane, imidazolesilane, triazinesilane, hexamethyldisilazane, hexaphenyldisilazane
- silane coupling to the thermosetting resin (a) in order to improve the dispersibility of the inorganic filler or to improve the adhesive strength between the resin and the inorganic filler or glass cloth. It is also possible to contain an agent and a wetting and dispersing agent.
- the silane coupling agent is not particularly limited as long as it is a silane coupling agent generally used for surface treatment of inorganic substances.
- Specific examples thereof include aminosilanes such as ⁇ -aminopropyltriethoxysilane, N- ⁇ - (aminoethyl) - ⁇ -aminopropyltrimethoxysilane, epoxysilanes such as ⁇ -glycidoxypropyltrimethoxysilane, Examples include vinyl silanes such as ⁇ -methacryloxypropyltrimethoxysilane, cationic silanes such as N- ⁇ - (N-vinylbenzylaminoethyl) - ⁇ -aminopropyltrimethoxysilane hydrochloride, and phenylsilanes. However, it is not particularly limited to these. These can be used alone or in combination of two or more according to the purpose.
- the wetting and dispersing agent is not particularly limited as long as it is a dispersion stabilizer used for paints.
- wet dispersing agents such as registered trademarks Disperbyk-110, 111, 180, 161, 2000, 2008, 2009, registered trademarks BYK-W996, W9010, and W903 manufactured by Big Chemie Japan Co., but are not limited to these. Not. These can be used alone or in combination of two or more according to the purpose.
- the content of the curable resin composition in the prepreg is not particularly limited, but is preferably 75% by mass or less, more preferably 70% by mass or less, and still more preferably 65% by mass or less from the viewpoint of reducing the linear thermal expansion coefficient. 60 mass% or less is still more preferable, and 55 mass% or less is especially preferable. Further, from the viewpoint of improving adhesion with copper foil and suppressing the generation of voids, the content of the curable resin composition in the prepreg is preferably 30% by mass or more, more preferably 32% by mass or more, and 34% by mass. The above is more preferable, 36% by mass or more is still more preferable, 38% by mass or more is particularly preferable, 40% by mass or more is particularly preferable, and 42% by mass or more is particularly preferable.
- the sheet-like fiber base material used for the prepreg is not particularly limited, and one or more selected from glass fibers, organic fibers, glass nonwoven fabrics, and organic nonwoven fabrics can be used.
- sheet-like fiber base materials such as glass fiber, an aramid nonwoven fabric, and a liquid crystal polymer nonwoven fabric, are preferable from a viewpoint of reducing the linear thermal expansion coefficient of a prepreg.
- glass fiber is more preferable, and glass cloth is more preferable.
- E glass fiber, T glass fiber, and Q glass fiber are preferable, T glass fiber and Q glass fiber are more preferable, and Q glass fiber is more preferable from the viewpoint that the linear thermal expansion coefficient can be reduced.
- Q glass fiber means the glass fiber for which the content rate of silicon dioxide occupies 90% or more.
- the thickness of the sheet-like fiber base material is not particularly limited.
- the thickness of the sheet-like fiber base material is preferably 200 ⁇ m or less, more preferably 175 ⁇ m or less, further preferably 150 ⁇ m or less, even more preferably 125 ⁇ m or less, even more preferably 100 ⁇ m or less, and even more preferably 85 ⁇ m.
- the following are particularly preferred: From the viewpoint of improving the handleability, the thickness of the sheet-like fiber substrate is preferably 1 ⁇ m or more, more preferably 5 ⁇ m or more, further preferably 10 ⁇ m or more, still more preferably 15 ⁇ m or more, and particularly preferably 20 ⁇ m or more. 25 ⁇ m or more is particularly preferable.
- the manufacturing method of the prepreg is not particularly limited, but the following method is preferable.
- the prepreg can be produced by a known hot melt method, solvent method or the like.
- the hot melt method without dissolving the curable resin composition in an organic solvent, the curable resin composition and a release paper having good releasability are once coated and laminated on a sheet-like fiber substrate, or by a die coater.
- This is a method for producing a prepreg by direct coating or the like.
- the sheet-like fiber base material is impregnated into the sheet-like fiber base material by immersing the sheet-like fiber base material in a resin composition varnish obtained by dissolving the curable resin composition in an organic solvent, and then dried. Is the method. It can also be prepared by continuously laminating an adhesive film made of a curable resin composition laminated on a support from both sides of a sheet-like reinforcing base material under heating and pressure conditions.
- Examples of the organic solvent used in preparing the resin composition varnish include ketones such as acetone, methyl ethyl ketone, and cyclohexanone, acetic acid such as ethyl acetate, butyl acetate, cellosolve acetate, propylene glycol monomethyl ether acetate, and carbitol acetate.
- Examples thereof include carbitols such as esters, cellosolve and butyl carbitol, aromatic hydrocarbons such as toluene and xylene, dimethylformamide, dimethylacetamide, N-methylpyrrolidone and the like, but are not particularly limited thereto. These can be used alone or in combination of two or more according to the purpose.
- the drying conditions of the resin composition varnish are not particularly limited, but the curable resin composition needs to have appropriate fluidity and adhesiveness from the viewpoint of developing higher adhesiveness in the vacuum heating and pressure bonding step. On the other hand, if a large amount of organic solvent remains in the prepreg, it can cause swelling after curing. Therefore, the content ratio of the organic solvent in the curable resin composition is preferably 5% by mass or less, and more preferably 2% by mass or less.
- the specific drying conditions vary depending on the curability of the curable resin composition, the amount of the organic solvent in the resin composition varnish, and the like, but when a resin composition varnish containing 30 to 60% by mass of an organic solvent is used. It is preferable to dry at 80 to 180 ° C. for 3 to 13 minutes. It is to be noted that suitable conditions can be appropriately set by conducting a simple pre-experiment in consideration of the resin composition varnish and the like.
- the thickness of the prepreg is not particularly limited, but is preferably 20 ⁇ m or more, more preferably 25 ⁇ m or more, still more preferably 30 ⁇ m or more, still more preferably 35 ⁇ m or more, and even more preferably 40 ⁇ m or more from the viewpoint of ensuring the desired rigidity as the prepreg. Is particularly preferred. From the viewpoint of reducing the thickness of the metal-clad laminate, the thickness of the prepreg is preferably 250 ⁇ m or less, more preferably 180 ⁇ m or less, further preferably 150 ⁇ m or less, still more preferably 120 ⁇ m or less, and even more preferably 90 ⁇ m or less. The thickness of the prepreg can be easily controlled by adjusting the amount of impregnation of the curable resin composition.
- Metal foil Although it does not specifically limit as metal foil, For example, copper foil, aluminum foil, etc. are used suitably. Specifically, JTC foil (manufactured by JX Nippon Mining & Metals Co., Ltd.), MT18Ex (manufactured by Mitsui Mining & Smelting Co., Ltd.) and the like are listed as commercial products.
- a printed wiring board can be manufactured by using the metal foil-clad laminate obtained by the manufacturing method of the present embodiment.
- a printed wiring board can be manufactured by the following method, for example. First, a metal foil-clad laminate of this embodiment is prepared. An etching process is performed on the surface of the metal foil-clad laminate to form an inner layer circuit, thereby producing an inner layer substrate. The inner layer circuit surface of the inner layer substrate is subjected to a surface treatment to increase the adhesive strength as necessary, then the required number of the prepregs are stacked on the inner layer circuit surface, and a metal foil for the outer layer circuit is stacked on the outer side. Then, it is integrally molded by heating and pressing.
- a multilayer laminate is produced in which an insulating layer made of a cured product of a sheet-like fiber base material and a thermosetting resin composition is formed between the inner layer circuit and the metal foil for the outer layer circuit.
- a plated metal film is formed on the wall surface of the hole to connect the inner layer circuit and the metal foil for the outer layer circuit.
- a printed wiring board is manufactured by performing an etching process on the metal foil for forming an outer layer circuit.
- the resin composition layer (the layer made of the curable resin composition of the present embodiment) of the metal foil-clad laminate obtained by the manufacturing method of the present embodiment constitutes an insulating layer in the printed wiring board. become.
- Example 1 36 parts by mass of an ⁇ -naphthol aralkyl-type cyanate ester compound (cyanate equivalent: 261 g / eq.) Synthesized by the method described in JP-A-2009-35728, polyphenylmethane maleimide (BMI-2300, Daiwa Kasei Kogyo ( 24 parts by mass) and 40 parts by mass of phenol biphenyl aralkyl type epoxy resin (NC-3000-FH, epoxy equivalent: 320 g / eq., Nippon Kayaku Co., Ltd.) were dissolved and mixed with methyl ethyl ketone.
- BMI-2300 polyphenylmethane maleimide
- Nippon Kayaku Co., Ltd. phenol biphenyl aralkyl type epoxy resin
- the obtained mixture was mixed with 2 parts by mass of a wetting and dispersing agent (registered trademark Disperbyk-161, manufactured by Big Chemie Japan Co., Ltd.), 190 parts by mass of spherical fused silica (SC2050MB, manufactured by Admatex Co., Ltd.), and a silicone resin.
- a wetting and dispersing agent registered trademark Disperbyk-161, manufactured by Big Chemie Japan Co., Ltd.
- SC2050MB spherical fused silica
- Admatex Co., Ltd. spherical fused silica
- silicone resin 30 parts by mass of silicone rubber powder (KMP-600, manufactured by Shin-Etsu Chemical Co., Ltd.), 0.02 parts by mass of zinc octylate (manufactured by Nippon Chemical Industry Co., Ltd.), 2,4,5- 1 part by mass of triphenylimidazole (manufactured by Wako Pure Chemical Industries, Ltd.) was further mixed to obtain a resin composition
- This varnish is diluted with methyl ethyl ketone, impregnated and coated on a T glass woven fabric having a thickness of 0.1 mm and a mass of 104 g / m 2 , dried by heating at 160 ° C. for 4 minutes, and a resin composition content of 50% by mass.
- a prepreg was obtained.
- a stack of 3 ⁇ m thick electrolytic copper foil (MT-Ex, manufactured by Mitsui Mining & Smelting Co., Ltd.) is placed on the upper and lower surfaces of the stack of two prepregs stacked, Using a vacuum laminator CVP-600 manufactured by Nichigo Morton Co., Ltd., this laminate is heated and pressurized for 60 seconds at a vacuum degree of 0.05 kPa, a heating temperature of 130 ° C., and a pressure of 3 kgf / cm 2. Thus, an adhesive body in which the copper foil and the prepreg were bonded was obtained.
- layer forming step of (B) described above using a multi-stage vacuum press for printed wiring boards, layer forming is performed for 120 minutes at a vacuum degree of 1 kPa, a heating temperature of 220 ° C., and a pressure of 10 kgf / cm 2.
- a double-sided copper-clad laminate double-sided metal foil-clad laminate having a thickness of 0.2 mm was obtained.
- Example 2 3 ⁇ m thick electrolytic copper foil (MT-Ex, manufactured by Mitsui Mining & Smelting Co., Ltd.) was placed on the upper and lower surfaces of the stack of the two prepregs produced in Example 1 to form a laminate, and the above-mentioned (A ) Using a vacuum laminator CVP-600 manufactured by Nichigo-Morton Co., Ltd., and heating and heating the laminate for 60 seconds at a vacuum degree of 0.05 kPa, a heating temperature of 130 ° C., and a pressure of 20 kgf / cm 2. By performing the pressure treatment, an bonded body in which the copper foil and the prepreg were bonded was obtained.
- MT-Ex manufactured by Mitsui Mining & Smelting Co., Ltd.
- layer forming step of (B) described above using a multi-stage vacuum press for printed wiring boards, layer forming is performed for 120 minutes at a vacuum degree of 1 kPa, a heating temperature of 220 ° C., and a pressure of 10 kgf / cm 2.
- a double-sided copper-clad laminate double-sided metal foil-clad laminate having a thickness of 0.2 mm was obtained.
- Example 3 Except for using 940 parts by mass of alumina (AA-3, manufactured by Sumitomo Chemical Co., Ltd.) instead of spherical fused silica, and omitting the blending of the silicone rubber powder whose surface was coated with silicone resin, the same as in Example 1.
- alumina AA-3, manufactured by Sumitomo Chemical Co., Ltd.
- spherical fused silica spherical fused silica
- Example 4 3 ⁇ m thick electrolytic copper foil (MT-Ex, manufactured by Mitsui Mining & Smelting Co., Ltd.) is placed vertically on the top and bottom surfaces of the stack of two prepregs produced in Example 3 as the stacking step (A). Using a vacuum laminator CVP-600 manufactured by Nichigo Morton Co., Ltd., this laminate is heated and pressurized for 90 seconds at a vacuum degree of 0.05 kPa, a heating temperature of 120 ° C., and a pressure of 15 kgf / cm 2. Thus, an adhesive body in which the copper foil and the prepreg were bonded was obtained.
- MT-Ex manufactured by Mitsui Mining & Smelting Co., Ltd.
- layer forming step of (B) described above by using a multi-stage vacuum press for printed wiring boards, layer forming is performed for 130 minutes at a vacuum degree of 2 kPa, a heating temperature of 220 ° C., and a pressure of 30 kgf / cm 2.
- a double-sided copper-clad laminate double-sided metal foil-clad laminate having a thickness of 0.2 mm was obtained.
- Comparative Example 1 (B) In place of the laminate molding step, in the heating oven, in the atmosphere, except that the heat treatment is performed at 220 ° C. for 120 minutes to thermally cure the curable resin composition, the same as in Example 1, A double-sided copper-clad laminate (double-sided metal foil-clad laminate) having a thickness of 0.2 mm was obtained.
- Comparative Example 2 Same as Example 1 except that the bonding step (A) is omitted and the processing conditions of the lamination molding step (B) are changed to 130 minutes at a vacuum degree of 2 kPa, a heating temperature of 220 ° C., and a pressure of 30 kgf / cm 2. Thus, a double-sided copper-clad laminate (double-sided metal foil-clad laminate) having a thickness of 0.2 mm was obtained.
- Comparative Example 4 A prepreg was produced in the same manner as in Example 1 except that the amount of spherical fused silica was changed to 60 parts by mass and the amount of the silicone rubber powder whose surface was coated with a silicone resin was changed to 3 parts by mass. Using the obtained prepreg, omitting the bonding step (A), and changing the processing conditions of the lamination molding step (B) to 130 minutes at a vacuum degree of 2 kPa, a heating temperature of 220 ° C., and a pressure of 30 kgf / cm 2. Obtained a double-sided copper-clad laminate (double-sided metal foil-clad laminate) having a thickness of 0.2 mm in the same manner as in Example 1.
- the peel strength of the copper foil was measured using the bonded body obtained by the bonding step (A). Furthermore, using the obtained double-sided copper-clad laminate, the moldability, the coefficient of thermal expansion, and the glass transition temperature were evaluated. These results are shown in Tables 1 and 2.
- Peel strength of copper foil After the obtained double-sided copper foil-clad laminate was cut into a size of 10 ⁇ 100 mm with a dicing saw, a measurement sample was obtained in which the copper foil on the surface was left.
- a copper clad laminate test method for printed wiring boards see 5.7 Peel strength
- AG-IS an autograph
- Formability Swelling of the copper foil of the pressed double-sided copper-clad laminate was confirmed, and the copper foil was etched, the appearance was observed, and the presence or absence of voids and the occurrence of unevenness from the ends were confirmed.
- the coefficient of thermal expansion and the glass transition temperature were measured by the following method after removing the copper foil by etching the metal-clad laminate.
- Coefficient of thermal expansion The temperature was increased from 40 ° C. to 340 ° C. at 10 ° C. per minute with a thermomechanical analyzer (TA Instruments), and the linear expansion coefficient in the plane direction from 60 ° C. to 120 ° C. was measured. The measurement direction was the longitudinal direction (Warp) of the glass cloth of the laminate.
- Glass transition temperature Measured with a dynamic viscoelasticity analyzer (TA Instruments) according to JIS C6481.
- the present invention can be widely and effectively used in various applications such as electrical / electronic materials, machine tool materials, and aviation materials that require high insulation, low coefficient of thermal expansion, or high heat resistance.
- the present invention can be used particularly effectively in the field of printed wiring boards that require high heat resistance, low coefficient of thermal expansion, high peel strength with metal foil, and the like.
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Abstract
Description
<1>
(A)金属箔の間に、一枚以上のプリプレグを金属面と接するように配置し、真空状態で加熱及び加圧して積層し、金属箔張積層板を得る接着工程、並びに
(B)前記金属箔張積層板に対してさらに真空状態で加熱及び加圧処理を施す積層成形工程、
を有する、金属箔張積層板の製造方法。
<2>
前記(A)接着工程において、真空度が0.001~1kPa、加熱温度が50~180℃、且つ、加圧圧力が1~30kgf/cm2の条件下で前記加熱及び加圧処理を実施する、<1>に記載の金属箔張積層板の製造方法。
<3>
前記(B)積層成形工程において真空度が0.01~6kPa、加熱温度が100~400℃、且つ、加圧圧力が1~40kgf/cm2の条件下で前記加熱及び加圧処理を実施する、<1>又は<2>に記載の金属箔張積層板の製造方法。
<4>
前記(A)接着工程において、金属箔のピール強度が0.01~0.1kN/mの接着体を得る、<1>~<3>のいずれか一項に記載の金属箔張積層板の製造方法。
前記(B)積層成形工程において、多段プレス機、多段真空プレス機又は連続成形機のいずれかを用いて前記加熱及び加圧処理を行う、<1>~<4>のいずれか一項に記載の金属箔張積層板の製造方法。
<6>
前記プリプレグが、熱硬化性樹脂(a)及び無機充填材(b)を含む硬化性樹脂組成物をシート状繊維基材に含浸又は塗布して得られるものである、<1>~<5>のいずれか一項に記載の金属箔張積層板の製造方法。
<7>
前記無機充填材(b)の前記プリプレグにおける含有量が、前記熱硬化性樹脂(a)100質量部に対して、80~1100質量部である、<6>に記載の金属箔張積層板の製造方法。
<8>
<1>~<7>のいずれか一項に記載の製造方法で得られた金属箔張積層板を絶縁層に使用する、プリント配線板。
まず、本実施形態の製造方法を構成する工程の一つである、(A)接着工程について述べる。
上述した(A)接着工程において用いるプリプレグは、硬化性樹脂組成物とシート状繊維基材を含有する。このプリプレグは、シート状繊維基材に硬化性樹脂組成物を含浸又は塗布し、必要に応じて加熱乾燥させることで、得ることができる。
上記プリプレグの硬化性樹脂組成物は、熱硬化性樹脂(a)及び無機充填材(b)を含有するものが好ましい。
プリプレグに用いるシート状繊維基材は、特に限定されず、ガラス繊維、有機繊維、ガラス不織布、有機不織布から選択される1種又は2種以上を使用することができる。なかでも、プリプレグの線熱膨張係数を低下させるという観点から、ガラス繊維、アラミド不織布、液晶ポリマー不織布等のシート状繊維基材が好ましい。これらのなかでも、ガラス繊維がより好ましく、ガラスクロスが更に好ましい。ガラス繊維のなかでも、線熱膨張係数を低下させることができるという観点から、Eガラス繊維、Tガラス繊維、Qガラス繊維が好ましく、Tガラス繊維、Qガラス繊維がより好ましく、Qガラス繊維が更に好ましい。なお、Qガラス繊維とは、二酸化珪素の含有率が90%以上を占めるガラス繊維のことをいう。
金属箔としては、特に限定されないが、たとえば銅箔、アルミニウム箔等が好適に用いられる。具体的には、JTC箔(JX日鉱日石金属(株)製)、MT18Ex(三井金属鉱業(株)製)などが市販品として挙げられる。
本実施形態の製造方法により得られた金属箔張積層板を用いることで、プリント配線板を製造することができる。プリント配線板は、例えば、以下の方法により製造することができる。まず、本実施形態の金属箔張積層板を用意する。この金属箔張積層板の表面にエッチング処理を施して内層回路の形成を行い、内層基板を作製する。この内層基板の内層回路表面に、必要に応じて接着強度を高めるための表面処理を行い、次いでその内層回路表面に上述したプリプレグを所要枚数重ね、更にその外側に外層回路用の金属箔を積層し、加熱加圧して一体成形する。このようにして、内層回路と外層回路用の金属箔との間に、シート状繊維基材及び熱硬化性樹脂組成物の硬化物からなる絶縁層が形成された多層の積層板が製造される。次いで、この多層の積層板にスルーホールやバイアホール用の穴あけ加工を施した後、この穴の壁面に内層回路と外層回路用の金属箔とを導通させるめっき金属皮膜を形成し、更に外層回路用の金属箔にエッチング処理を施して外層回路を形成することで、プリント配線板が製造される。このとき、本実施形態の製造方法により得られた金属箔張積層板の樹脂組成物層(本実施形態の硬化性樹脂組成物からなる層)が、このプリント配線板において絶縁層を構成することになる。
特開2009-35728号公報に記載の方法で合成したα-ナフトールアラルキル型シアン酸エステル化合物(シアネート当量:261g/eq.)36質量部と、ポリフェニルメタンマレイミド(BMI-2300、大和化成工業(株)製)24質量部と、フェノールビフェニルアラルキル型エポキシ樹脂(NC-3000-FH,エポキシ当量:320g/eq.、日本化薬(株)製)40質量部とを、メチルエチルケトンで溶解混合した。得られた混合物に、湿潤分散剤(登録商標Disperbyk-161、ビッグケミージャパン(株)製)2質量部と、球状溶融シリカ(SC2050MB、アドマテックス(株)製)190質量部と、シリコーンレジンで表面を被覆したシリコーンゴムパウダー(KMP-600、信越化学工業(株)製)30質量部と、オクチル酸亜鉛(日本化学産業(株)製)0.02質量部と、2,4,5-トリフェニルイミダゾール(和光純薬社製)1質量部とをさらに混合して、樹脂組成物ワニスを得た。このワニスをメチルエチルケトンで希釈し、厚さ0.1mm、質量104g/m2であるTガラス織布に含浸塗工し、160℃で4分間加熱乾燥して、樹脂組成物含有量50質量%のプリプレグを得た。
このプリプレグを2枚重ねたスタックの上下面に、3μm厚の電解銅箔(MT-Ex、三井金属鉱業(株)製)をそれぞれ配置して積層体とし、上述した(A)接着工程のとして、ニチゴー・モートン(株)製真空ラミネーターCVP-600を使用して、真空度0.05kPa、加熱温度130℃、圧力3kgf/cm2で60秒間、この積層体に加熱及び加圧処理を行うことで、銅箔とプリプレグとが接着された接着体を得た。次に、上述した(B)の積層成形工程として、プリント配線板用多段真空プレスを使用して、真空度1kPa、加熱温度220℃、圧力10kgf/cm2で120分間、積層成形を行うことで、厚み0.2mmの両面銅張積層板(両面金属箔張積層板)を得た。
実施例1で作製したプリプレグを2枚重ねたスタックの上下面に、3μm厚の電解銅箔(MT-Ex、三井金属鉱業(株)製)をそれぞれ配置して積層体とし、上述した(A)の接着工程として、ニチゴー・モートン(株)製真空ラミネーターCVP-600を使用して、真空度0.05kPa、加熱温度130℃、圧力20kgf/cm2で60秒間、この積層体に加熱及び加圧処理を行うことで、銅箔とプリプレグとが接着された接着体を得た。次に、上述した(B)の積層成形工程として、プリント配線板用多段真空プレスを使用して、真空度1kPa、加熱温度220℃、圧力10kgf/cm2で120分間、積層成形を行うことで、厚み0.2mmの両面銅張積層板(両面金属箔張積層板)を得た。
球状溶融シリカの代わりにアルミナ(AA-3、住友化学(株)製)940質量部を使用し、シリコーンレジンで表面を被覆したシリコーンゴムパウダーの配合を省略すること以外は、実施例1と同様に行なって、プリプレグを作製した。このようにして得られた作成したプリプレグを2枚重ねたスタックの上下面に、3μm厚の電解銅箔(MT-Ex、三井金属鉱業(株)製)をそれぞれ配置して積層体とし、上述した(A)の接着工程として、ニチゴー・モートン(株)製真空ラミネーターCVP-600を使用して、真空度0.05kPa、加熱温度140℃、圧力5kgf/cm2で60秒間、この積層体に加熱及び加圧処理を行うことで、銅箔とプリプレグとが接着された接着体を得た。次に、上述した(B)の積層成形工程として、プリント配線板用多段真空プレスを使用して、真空度1kPa、加熱温度230℃、圧力10kgf/cm2で130分間、積層成形を行うことで、厚み0.2mmの両面銅張積層板(両面金属箔張積層板)を得た。
実施例3で作製したプリプレグを2枚重ねたスタックの上下面に、3μm厚の電解銅箔(MT-Ex、三井金属鉱業(株)製)を上下に配置し、(A)の積層工程として、ニチゴー・モートン(株)製真空ラミネーターCVP-600を使用して、真空度0.05kPa、加熱温度120℃、圧力15kgf/cm2で90秒間、この積層体に加熱及び加圧処理を行うことで、銅箔とプリプレグとが接着された接着体を得た。次に、上述した(B)の積層成形工程として、プリント配線板用多段真空プレスを使用して、真空度2kPa、加熱温度220℃、圧力30kgf/cm2で130分間、積層成形を行なうことで、厚み0.2mmの両面銅張積層板(両面金属箔張積層板)を得た。
(B)の積層成形工程に代えて、加熱オーブン内で、大気中、220℃、120分間の熱処理を行なって硬化性樹脂組成物を熱硬化させること以外は、実施例1と同様にして、厚み0.2mmの両面銅張積層板(両面金属箔張積層板)を得た。
(A)の接着工程を省略し、(B)の積層成形工程の処理条件を真空度2kPa、加熱温度220℃、圧力30kgf/cm2で130分間に変更すること以外は、実施例1と同様にして、厚み0.2mmの両面銅張積層板(両面金属箔張積層板)を得た。
(A)の接着工程を省略し、(B)の積層成形工程の処理条件を真空度2kPa、加熱温度220℃、圧力30kgf/cm2で130分間に変更すること以外は、実施例3と同様にして、厚み0.2mmの両面銅張積層板(両面金属箔張積層板)を得た。
球状溶融シリカの配合量を60質量部に、シリコーンレジンで表面を被覆したシリコーンゴムパウダーの配合量を3質量部に変更すること以外は、実施例1と同様にして、プリプレグを作製した。得られたプリプレグを用い、(A)の接着工程を省略し、(B)の積層成形工程の処理条件を真空度2kPa、加熱温度220℃、圧力30kgf/cm2で130分間に変更すること以外は、実施例1と同様にして、厚み0.2mmの両面銅張積層板(両面金属箔張積層板)を得た。
成形性:プレスした両面銅張積層板の銅箔の膨れを確認し、また、銅箔をエッチングして、外観を観察し、ボイドの有無と、端部からのムラの発生を確認した。
熱膨張率:熱機械分析装置(TAインスツルメント製)で40℃から340℃まで毎分10℃で昇温し、60℃から120℃での面方向の線膨張係数を測定した。測定方向は積層板のガラスクロスの縦方向(Warp)を測定した。
ガラス転移温度:JIS C6481に従い、動的粘弾性分析装置(TAインスツルメント製)で測定した。
Claims (8)
- (A)金属箔の間に、一枚以上のプリプレグを金属面と接するように配置し、真空状態で加熱及び加圧して積層し、金属箔張積層板を得る接着工程、並びに
(B)前記金属箔張積層板に対してさらに真空状態で加熱及び加圧処理を施す積層成形工程、
を有する、金属箔張積層板の製造方法。 - 前記(A)接着工程において、真空度が0.001~1kPa、加熱温度が50~180℃、且つ、加圧圧力が1~30kgf/cm2の条件下で前記加熱及び加圧処理を実施する、
請求項1に記載の金属箔張積層板の製造方法。 - 前記(B)積層成形工程において、真空度が0.01~6kPa、加熱温度が100~400℃、且つ、加圧圧力が1~40kgf/cm2の条件下で前記加熱及び加圧処理を実施する、
請求項1又は2に記載の金属箔張積層板の製造方法。 - 前記(A)接着工程において、金属箔のピール強度が0.01~0.1kN/mの接着体を得る、
請求項1~3のいずれか一項に記載の金属箔張積層板の製造方法。 - 前記(B)積層成形工程において、多段プレス機、多段真空プレス機又は連続成形機のいずれかを用いて前記加熱及び加圧処理を行う、
請求項1~4のいずれか一項に記載の金属箔張積層板の製造方法。 - 前記プリプレグが、熱硬化性樹脂(a)及び無機充填材(b)を含む硬化性樹脂組成物をシート状繊維基材に含浸又は塗布して得られるものである、
請求項1~5のいずれか一項に記載の金属箔張積層板の製造方法。 - 前記無機充填材(b)の前記プリプレグにおける含有量が、前記熱硬化性樹脂(a)100質量部に対して、80~1100質量部である、
請求項6に記載の金属箔張積層板の製造方法。 - 請求項1~7のいずれか一項に記載の製造方法で得られた金属箔張積層板を絶縁層に使用する、
プリント配線板。
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JP7563441B2 (ja) | 2022-10-13 | 2024-10-08 | 味の素株式会社 | 金属箔付き樹脂シート |
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CN105517325B (zh) * | 2015-11-30 | 2018-07-24 | 卢美珍 | 印刷电路板的覆金属层叠板结构 |
CN105517321B (zh) * | 2015-11-30 | 2018-06-19 | 燕山大学里仁学院 | 电子元件封装体的覆金属层基板结构 |
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