JP5110613B2 - Release material for resin base substrate and manufacturing method thereof - Google Patents

Description

  The present invention relates to a release material for a resin base substrate used for manufacturing a resin base substrate and a method for manufacturing the same.

  As one of the resin base substrates, there is a resin base printed substrate, and its manufacture is performed as follows. First, a glass cloth, paper or the like is impregnated with a resin, and then dried and semi-cured sheet (hereinafter referred to as prepreg) is produced. After stacking a plurality of laminates of this prepreg, copper foil, and stainless steel specular plate, a hot plate is placed on the top and bottom of the laminate and pressed. Next, by removing the hot plate and the mirror plate and disassembling the laminate, a resin-based printed board composed of a prepreg in which the resin is cured and a copper foil bonded to the surface thereof is manufactured. At this time, the flatness of the resin-based printed board is also adjusted. Moreover, the thing only of the prepreg manufactured without laminating | stacking copper foil is also used as a resin base printed circuit board.

  In the production described above, when the mirror plate and the prepreg (resin base printed board) are bonded by heating and pressing, and the laminate is disassembled, there is a problem that the mirror board is difficult to peel off from the produced resin base printed board. is there. In order to solve this problem, a laminate is formed by disposing a release material between the mirror plate and the prepreg. And in patent document 1, as a mold release material, the coating agent which mixed the silicone as a release agent with an epoxy resin, or the coating agent which further mixed the surface roughening agent as needed is provided in the single side | surface or both surfaces of aluminum foil. What has been proposed.

Japanese Patent Publication No. 4-9

However, when the release material of Patent Document 1 is used, adhesion between the mirror plate and the prepreg can be prevented, but the produced resin base printed circuit board and the release material are strongly bonded, and the release material becomes the resin base print. There is a problem that it is difficult to peel off from the substrate.
Similarly, in the production using a solution casting method of a resin film, which is one of the resin base substrates, there is a problem that a release material used as a support for the resin film is hardly peeled off from the resin film.

  Therefore, the present invention was devised to solve such a problem, and the problem is that it is excellent in releasability that can be easily peeled off from the resin base substrate when used in the manufacture of the resin base substrate. Another object of the present invention is to provide a release material for a resin base substrate and a method for manufacturing the same.

In order to solve the above problems, a release material for a resin base substrate according to the present invention is used for manufacturing a resin base substrate, and is formed on one or both surfaces of an aluminum foil and the aluminum foil. And a resin coating film made of resin and silicone, wherein the resin coating film has an adhesive strength of 1 to 200 g / cm with respect to the resin base substrate.

According to the above configuration, the resin coating film is composed of the epoxy resin as the main agent, the melamine resin as the curing agent, and the silicone as the release agent, and the adhesive strength to the resin base substrate is within a predetermined range. The releasability of the release material for the resin base substrate is improved, and the release material for the resin base substrate is easily peeled from the resin base substrate.
Moreover, since heat is efficiently transferred, the productivity of the resin base substrate is improved. Further, when used for a resin-based printed circuit board, since the generation of static electricity is small, the adhesion of foreign matter to the release material is small, and the cleanliness of the resin-based circuit board is improved. Furthermore, by providing the aluminum foil, it is possible to prevent contamination due to gas generated when the resin base substrate is manufactured.

In the release material for a resin base substrate according to the present invention, the resin coating film preferably has a film thickness of 0.5 to 5 μm.
According to the said structure, when the film thickness of a resin coating film is a predetermined range, it becomes easy to adjust the adhesive strength of a resin coating film to a predetermined range, and the peelability of the mold release material for resin base substrates further improves.

In the release material for a resin base substrate according to the present invention, the resin coating film is preferably 0.07 to 3 parts by mass of silicone with respect to 100 parts by mass of the epoxy resin.
According to the said structure, when the composition of a resin coating film is a predetermined range, it becomes easy to adjust the adhesive strength of a resin coating film to a predetermined range, and the peelability of the mold release material for resin base substrates further improves.

The mold release material for a resin base substrate according to the present invention contains at least one surface roughening particle selected from SiO ₂ , MgO, Al ₂ O ₃ , BaSO ₄ and Mg (OH) _{2 in the} resin coating film. Furthermore, it is preferable to contain.
According to the said structure, the surface of a resin film becomes uneven | corrugated by further containing the surface roughening particle | grains in the said resin coating film, The surface of a resin base substrate becomes uneven | corrugated by the unevenness | corrugation, and becomes a matte surface. .

In the release material for a resin base substrate according to the present invention, the surface roughened particles preferably have a particle diameter of 15 nm to 4 μm.
According to the said structure, the unevenness | corrugation amount of the surface of a resin base substrate is adjusted because the particle diameter of the surface roughening particle | grains is a predetermined range.

In the release material for a resin base substrate according to the present invention, the resin base substrate is preferably a resin base printed substrate.
When the release material for a resin base substrate of the present invention is used for the production of a resin base printed substrate, a remarkable improvement in peelability and the like is observed.

  The production method according to the present invention is a method for producing the release material for a resin base substrate, wherein an epoxy resin as a main agent, a melamine resin as a curing agent, and a release agent on one or both sides of an aluminum foil A coating step of forming a resin coating film by applying a resin coating composed of silicone, and a baking step of baking the resin coating film at 125 to 240 ° C. for 0.5 to 60 seconds. And

  According to the said procedure, the resin coating film which has the adhesive strength of a predetermined range is formed in the single side | surface or both surfaces of aluminum foil by performing the baking process which performs the baking process of predetermined conditions to the resin coating film which has a predetermined composition.

The production method according to the present invention is a method for producing the release material for a resin base substrate, wherein an epoxy resin as a main agent, a melamine resin as a curing agent, and a release agent on one or both sides of an aluminum foil Application that forms a resin coating film by applying a resin paint composed of the above silicone and one or more kinds of surface roughening particles selected from SiO ₂ , MgO, Al ₂ O ₃ , BaSO ₄ and Mg (OH) ₂ And a baking step of baking the resin coating film at 125 to 240 ° C. for 0.5 to 60 seconds.

  According to the above procedure, the resin base substrate has a predetermined range of adhesive strength by performing a baking process in which a resin coating film having a predetermined composition further containing surface roughening particles is subjected to a baking process under predetermined conditions. The resin coating which makes the surface uneven | corrugated is formed in the single side | surface or both surfaces of aluminum foil.

In the production method according to the present invention, in the application step, the resin paint is preferably applied to one or both surfaces of the aluminum foil by a gravure coating method.
According to the said procedure, the film thickness of a resin coating film becomes uniform by apply | coating by the gravure coating method.

  In the manufacturing method according to the present invention, the resin base substrate is preferably a resin base printed substrate. When the manufacturing method according to the present invention is used for manufacturing a resin-based printed circuit board, a resin coating film having suitable adhesive strength and the like is formed on one side or both sides of an aluminum foil.

  According to the release material for a resin base substrate according to the present invention, when used for the production of a resin base substrate, it has excellent releasability that can be easily peeled off from the resin base substrate, and has excellent heat resistance. The cleanliness and productivity of the resin base substrate are improved. Moreover, according to the mold release material for resin base substrates which concerns on this invention, it is excellent in workability | operativity at the time of manufacturing a resin base substrate, and can adjust the surface shape of a resin base substrate. In particular, the release material for a resin base substrate according to the present invention has releasability and the like suitable for use in the manufacture of a resin base printed substrate that is one of the resin base substrates.

  According to the production method of the present invention, it is possible to produce a release material for a resin base substrate that is excellent in peelability and heat resistance and can improve the cleanliness and productivity of the resin base substrate. Moreover, according to the manufacturing method which concerns on this invention, the mold release material for resin base substrates which can adjust the surface shape of a resin base substrate can be manufactured. In particular, the manufacturing method according to the present invention can suitably manufacture a release material for a resin base substrate used for manufacturing a resin base printed circuit board which is one of the resin base substrates.

It is a perspective view which shows the structure of the mold release material for resin base substrates which concerns on this invention. It is a perspective view which shows the other structure of the mold release material for resin base substrates which concerns on this invention. It is a process flow which shows the manufacturing method of the mold release material for resin base substrates which concerns on this invention. It is a schematic diagram which shows the gravure coat method which is one of the coating methods. It is a schematic diagram which shows the manufacturing method of a resin base substrate. It is the schematic diagram after the heating pressurization with the hot plate which shows the usage method of the mold release material of FIG. It is the schematic diagram after the heating pressurization with the hot plate which shows the usage method of the mold release material of FIG. It is the schematic diagram after the heating pressurization with the hot plate which shows the other usage method of the mold release material of FIG. It is the schematic diagram after the heating-pressing by the hot plate which shows the other usage method of the mold release material of FIG. The other usage method of the mold release material of FIG. 1 is shown, (a) is before heating and pressing with a hot plate, (b) is a schematic diagram after heating and pressing. It is a schematic diagram which shows the manufacturing method of the resin film using a solution casting method.

<Release material for resin base substrate>
An embodiment of a release material for a resin base substrate (hereinafter referred to as a release material) according to the present invention will be described in detail with reference to the drawings.
The release material is used when the resin base substrate is manufactured. In the present invention, the resin base substrate is a resin base printed substrate (hereinafter referred to as a printed substrate) used for fixing and wiring an electronic component, or a resin film manufactured by a solution casting method, or the like. . The shape of the release material is a coil shape or a sheet shape, and is cut into a predetermined length when used. Details of how to use the release material will be described later.

As shown in FIGS. 1 and 2, the release materials 1 </ b> A and 1 </ b> B include an aluminum foil 2 and a resin coating 3 formed on one or both sides of the aluminum foil 2, and the resin coating 3 is applied to the resin base substrate. The adhesive strength is within a predetermined range.
Each configuration will be described below. In addition, although it demonstrates taking the case of the mold release materials 1A and 1B used for manufacture of printed circuit boards 11A and 11B (refer FIGS. 5-9) which are one of the resin base boards, it is one of the resin base boards. The same applies to the release materials 1A and 1B used for manufacturing the resin film 11D (see FIG. 11).

(Aluminum foil)
The alloy type of aluminum (including the aluminum alloy) constituting the aluminum foil 2 is not particularly limited, but it is preferable to select an alloy type such that the proof stress of the aluminum foil 2 is 140 to 270 MPa. Examples of such alloy types include JIS-regulated 1000 series and 3000 series alloys. Moreover, if the proof stress of the aluminum foil 2 is less than 140 MPa, the workability at the time of manufacturing a printed circuit board tends to be lowered, and if the proof stress exceeds 270 MPa, the manufacturing cost of the release materials 1A and 1B tends to be high. Moreover, the foil thickness of the aluminum foil 2 is preferably less than 200 μm, more preferably 20 to 50 μm in consideration of workability and manufacturing cost. In addition, the aluminum foil 2 also has an effect | action which prevents the tensile wrinkle of the copper foil of a printed circuit board from the difference in the linear expansion coefficient of aluminum and copper.

(Resin coating film)
The resin coating 3 is made of an epoxy resin, a melamine resin, and silicone. The resin coating film 3 has an adhesive strength of 1 to 200 g / cm. The adhesive strength is achieved by performing a baking process under a predetermined condition on the resin coating film 3 having a predetermined composition in the method for manufacturing the release materials 1A and 1B described later.

  Epoxy resins include bisphenol A type epoxy resin, bisphenol F type epoxy resin, novolac type epoxy resin, brominated epoxy resin, amine type epoxy resin, flexible epoxy resin, hydrogenated bisphenol A type epoxy resin, phenoxy resin, Examples thereof include brominated phenoxy resin.

  Examples of the melamine-based resin include methyl etherified melamine resin, butylated urea melamine resin, butylated melamine resin, methylated melamine resin, and butyl alcohol-modified melamine resin. The melamine resin may be a mixed resin of the resin and a butylated urea resin, a butylated benzoguanamine resin, or the like.

  The number average molecular weight of the epoxy resin is preferably 2000 to 3000, and the number average molecular weight of the melamine resin is preferably 500 to 1000. By having such a number average molecular weight, the resin can be made into a paint and the adhesive strength of the resin coating film can be easily adjusted to a predetermined range.

  Examples of silicone include methylphenylpolysiloxane, methylhydropolysiloxane, dimethylpolysiloxane, modified dimethylpolysiloxane, and mixtures thereof. Here, the modification is, for example, epoxy modification, alkyl modification, amino modification, carboxyl modification, alcohol modification, fluorine modification, alkylaralkyl polyether modification, epoxy polyether modification, polyether modification, alkyl higher alcohol ester modification, polyester modification. And acyloxyalkyl modification, halogenated alkylacyloxyalkyl modification, halogenated alkyl modification, aminoglycol modification, mercapto modification, hydroxyl group-containing polyester modification, and the like.

  The adhesive strength of the resin coating 3 is the unit length (1 cm) of the force (maximum strength) required to peel the release materials 1A, 1B (resin coating 3) from the surfaces of the printed boards 11A, 11B (prepreg 12). ) And the test method is performed according to the peeling method described in FIG. 6 of JISC6481-1996. Specifically, the release materials 1A and 1B (resin coating film 3) are printed boards 11A and 11B (prepreg 12). The surface was peeled upward at an angle of 90 degrees. The peeling rate was 50 mm / min, and peeling was performed at room temperature.

  When the adhesive strength is less than 1 g / cm, when the laminate is disassembled, the release materials 1A and 1B are already peeled off, and workability is deteriorated. When the adhesive strength exceeds 200 g / cm, the peelability of the resin coating film 3 (release materials 1A, 1B) is reduced, and the release materials 1A, 1B can be peeled from the prepreg 12 (printed boards 11A, 11B). It becomes difficult.

  The resin coating film 3 preferably has a film thickness of 0.5 to 5 μm. When the film thickness is less than 0.5 μm, the resin coating film 3 is too thin and difficult to form, so that the productivity is likely to decrease. Moreover, when a film thickness exceeds 5 micrometers, the further improvement of the peelability of the resin coating film 3 is not seen, but the manufacturing cost of the resin coating film 3 (release material 1A, 1B) tends to become high. Moreover, the film thickness of the resin coating film 3 is achieved by applying a resin coating in a predetermined application amount in a method for manufacturing the release materials 1A and 1B described later.

  It is preferable that the resin coating 3 is 0.07-3 mass parts of silicone with respect to 100 mass parts of epoxy resins. Silicone functions as a release agent for the resin coating film 3. When the amount of silicone is less than 0.07 parts by mass, the adhesive strength of the resin coating film 3 is increased, so that the peelability of the resin coating film 3 is likely to be lowered. When silicone exceeds 3 mass parts, since the adhesive strength of the resin coating film 3 becomes small, workability at the time of peeling deteriorates.

  As for the resin coating film 3, it is more preferable that a melamine resin is 40-55 mass parts with respect to 100 mass parts of epoxy resins. The melamine resin functions as a curing agent. When the melamine-based resin is less than 40 parts by mass, the hardness of the resin coating film 3 is lowered and the adhesive strength is increased, so that the peelability of the resin coating film 3 is likely to be lowered. When the melamine-based resin exceeds 55 parts by mass, the adhesive strength increases due to insufficient curing of the resin coating film 3, so that workability at the time of peeling deteriorates.

In addition to the epoxy resin, melamine resin and silicone, the resin coating 3 is one or more kinds of surface roughened particles selected from SiO ₂ , MgO, Al ₂ O ₃ , BaSO ₄ and Mg (OH) _2. It is preferable to further contain. When the resin coating film 3 contains surface roughening particles, the surface of the resin coating film 3 becomes uneven. Due to the unevenness, the surface of the prepreg 12 (printed substrates 11A and 11B) becomes uneven and becomes a matte surface. Although content of the surface roughening particle | grains will not be specifically limited if the resin coating film 3 is uneven | corrugated, 1-10 mass parts is preferable with respect to 100 mass parts of epoxy resins.

  The particle diameter of the surface roughened particles is preferably 15 nm to 4 μm. Here, the particle diameter means an average particle diameter (average value of the maximum particle diameter and the minimum particle diameter) measured from a scanning electron microscope (SEM) photograph or the like. When the particle diameter of the surface roughened particles is in the above range, the unevenness on the surface of the resin coating film 3 can be easily adjusted, and as a result, the unevenness on the surface of the prepreg 12 can be easily adjusted. Specifically, the amount of unevenness on the surface of the prepreg 12 is about 4.0 μm in terms of the maximum height roughness Ry defined by JIS.

<Manufacturing method of release material>
Next, the manufacturing method of a mold release material is demonstrated.
As shown in FIG. 3, the mold release material manufacturing method includes an application step S <b> 1 and a baking step S <b> 2. Hereinafter, each step will be described. In addition, although it demonstrates taking the case of the mold release material used for manufacture of printed circuit board 11A, 11B (refer FIGS. 5-9) which is one of the resin base boards, resin film 11D which is one of the resin base boards The same applies to the release material used for manufacturing (see FIG. 11). Moreover, the structure of a mold release material refers to FIG. 1, FIG.

(Coating process: S1)
In the coating step S1, a resin coating made of an epoxy resin as a main agent, a melamine resin as a curing agent, and silicone as a release agent is applied to one surface or both surfaces of the aluminum foil 2 to form a resin coating film 3. It is a process of forming. The resin paint is obtained by adding silicone to a resin solution obtained by dissolving an epoxy resin and a melamine resin in an organic solvent such as alcohol. Moreover, it is preferable that the compounding quantity (addition quantity) in a resin coating is 40-55 mass parts of melamine type resins, and 0.07-3 mass parts of silicone with respect to 100 mass parts of epoxy resins.

The coating method in the coating step S1 is not particularly limited as long as the resin coating film 3 can be formed, but a gravure coating method, a bar coating method, a roll coating method, a curtain flow coating method, a method using an electrostatic coating machine, or the like. The gravure coating method is preferable in view of the uniformity of the resin coating film 3 and the simplicity of work. Moreover, as an application quantity, 1.0-2.0 g / m < ² > is preferable as a resin amount so that it may become the resin film 3 preferable film thickness: 0.5-5 micrometers.

  The gravure coating method is a method in which the resin coating film 3 is formed on the surface of the aluminum foil 2 by transferring the resin coating filled in the recesses (cells) provided on the roll surface onto the aluminum foil. Specifically, as shown in FIG. 4, the lower part of the lower roll 22 provided with the cells 23 on the surface is immersed in the resin paint, and the resin paint is pumped into the cells 23 by the rotation of the lower roll 22. And while arrange | positioning the aluminum foil 2 between the lower roll 22 and the upper roll 21 arrange | positioned above the lower roll 22, pressing the aluminum foil 2 against the lower roll 22 with the upper roll 21, By rotating the roll 22 and the upper roll 21, the aluminum foil 2 is conveyed, and the resin paint pumped into the cell 23 is transferred (applied) to one surface of the aluminum foil 2.

  Further, by disposing the doctor blade 24 on the carry-in side of the aluminum foil 2 so as to contact the surface of the lower roll 22, excess resin paint pumped up on the roll surface other than the cell 23 is removed, and the aluminum foil is removed. A predetermined amount of resin paint is applied to the surface of 2. In addition, when the count (size and depth) of the cell 23 is large, or when the viscosity of the resin paint is high, the resin coating film 3 formed on one surface of the aluminum foil 2 is difficult to be smooth. Therefore, the smoothing roll 25 may be disposed on the carry-out side of the aluminum foil 2 to maintain the smoothness of the resin coating film 3.

  In addition, when forming the resin coating film 3 on both surfaces of the aluminum foil 2, after forming the resin coating film 3 on one surface of the aluminum foil 2, the aluminum foil 2 is turned over, and the lower roll 22 and the upper side again. It arrange | positions between the rolls 21. In the same manner as described above, the resin paint in the cell 23 of the lower roll 22 is transferred (applied) to the back surface of the aluminum foil 2.

(Baking process: S2)
The baking step S2 is a step of subjecting the resin coating film 3 formed in the step S1 to a baking treatment at 125 to 240 ° C. (baking temperature) for 0.5 to 60 seconds (baking time). In this way, the adhesive strength of the resin coating film 3 to the printed boards 11A and 11B (prepreg 12) is controlled within a predetermined range by subjecting the resin coating film formed of the resin coating of a predetermined blending amount to a baking process under predetermined conditions. Is done. In the present invention, the baking temperature is the ultimate temperature of the aluminum foil 2. Moreover, a conventionally well-known apparatus is used as a heating means used for a baking process.

  When the baking temperature is less than 125 ° C. or the baking time is less than 0.5 seconds, the resin coating film 3 becomes insufficiently cured, the adhesive strength of the resin coating film 3 exceeds 200 g / cm, and the peelability is lowered. To do. Moreover, when baking temperature exceeds 240 degreeC, the resin coating film 3 deteriorates, adhesive strength exceeds 200 g / cm, and the workability | operativity at the time of peeling deteriorates. Further, when the baking time exceeds 60 seconds, the productivity is deteriorated.

In the production method according to the present invention, the resin coating in the coating step includes an epoxy resin as a main agent, a melamine resin as a curing agent, silicone as a release agent, SiO ₂ , MgO, Al ₂ O _3. Or one or more types of surface roughened particles selected from BaSO ₄ and Mg (OH) ₂ .

  Specifically, the resin coating is obtained by further adding surface roughening particles to the above-described silicone-added resin solution. By further adding such surface roughening particles to the resin coating, the surface of the resin coating 3 becomes uneven, and the unevenness causes the printed boards 11A and 11B (prepreg 12) to become a matte surface. And in order to obtain printed circuit board 11A, 11B which has such a matt surface, the compounding quantity (addition quantity) of the surface roughening particle | grains in resin coating is 1-10 with respect to 100 mass parts of epoxy resin. It is preferable that it is a mass part. Moreover, it is more preferable that the particle diameter of the surface roughened particles is 15 nm to 4 μm.

  The production method according to the present invention is as described above. However, in carrying out the present invention, other steps may be included between or before and after each step within a range that does not adversely affect each step. . For example, a cleaning process for cleaning the surface of the aluminum foil 2 may be performed before the coating process S1.

<How to use release material>
Next, a method for using the release material will be described with an example of manufacturing a printed circuit board which is one of the resin base boards.
The printed circuit board with copper foil is manufactured by the following procedure.

  As shown in FIG. 5, a glass cloth or paper is impregnated with an epoxy resin, a phenol resin, a polyimide resin, and the like, and a dried semi-cured prepreg 12 is prepared. The copper foil 13 is disposed so as to face one surface of the semi-cured prepreg 12. And it arrange | positions so that the resin coating film 3 of the mold release material 1A which concerns on this invention may face the other surface of the prepreg 12. FIG. Moreover, the mirror surface board 4 (for example, stainless steel board) is each arrange | positioned so that the copper foil 13 and the aluminum foil 2 of the mold release material 1A may be faced, and a laminated body is comprised. After stacking a plurality of the laminates, the hot plates 5 are arranged above and below.

Next, a pressure of 30 kg / cm ² or more is applied to the hot plate 5 at 150 to 300 ° C. for 1 hour or more. As a result, the resin of the prepreg 12 is cured, the copper foil 13 is bonded to one surface, and the release material 1A is bonded to the other surface through the resin coating 3 (see FIG. 6). In general, since the size of the copper foil 13 is set to be larger than that of the semi-cured prepreg 12, the prepreg 12 is prevented from exuding to the outside due to heat and pressure.

  After the heating and pressurization, the hot plate 5 and the mirror plate 4 are removed, the laminate is disassembled, and the release material 1A (resin coating film 3) adhered to the cured prepreg 12 is peeled off, thereby attaching the copper foil. A plurality of printed circuit boards 11A are manufactured. The release material 1A may be peeled off manually by an operator or using a robot or the like.

  Although the example using the release material 1A (see FIG. 1) in which the resin coating 3 is formed on one side of the aluminum foil 2 has been described above, the release material in which the resin coating 3 is formed on both sides of the aluminum foil 2 The case where 1B (refer FIG. 2) is used is demonstrated below as an example.

  As shown in FIG. 7, a semi-cured prepreg 12, copper foil 13, and mirror plate 4 are arranged in this order on both sides of the release material 1B to constitute a laminate. By stacking a plurality of the laminates and heating and pressing in the same manner as described above, the prepreg 12 to which the resin is cured and the copper foil 13 is adhered is bonded to both sides of the release material 1B (resin coating film 3). Manufactured. The laminate is disassembled in the same manner as described above, and the release material 1B (resin coating film 3) is peeled from the prepreg 12 to produce a plurality of printed boards 11A with copper foil.

Next, manufacture of the printed circuit board which does not have copper foil is demonstrated.
As shown in FIG. 8, the release material 1 </ b> A and the mirror plate 4 are arranged in this order on both sides of the semi-cured prepreg 12 so that the resin coating 3 faces the prepreg 12, thereby forming a laminate. A plurality of the laminates are stacked and heated and pressed in the same manner as described above to produce a product in which the release material 1A (resin coating film 3) is bonded to both sides of the cured prepreg 12. The laminate is disassembled in the same manner as described above, and the release material 1A (resin coating film 3) is peeled from the prepreg 12 to produce a plurality of printed circuit boards 11B composed of only the prepreg 12.

  When the release material 1B is used, as shown in FIG. 9, the release material 1A and the mirror plate 4 are disposed so that the semi-cured prepreg 12 and the resin coating 3 face the prepreg 12 on both sides of the release material 1B. Are arranged in this order to constitute a laminate. By stacking a plurality of the laminates and applying heat and pressure in the same manner as described above, the release material 1A (resin coating film 3) is bonded to one surface of the cured prepreg 12, and the release material 1B (resin coating film 3) is bonded to the other surface. Is produced. The laminate is disassembled in the same manner as described above, and the release material 1A (resin coating film 3) and the release material 1B (resin coating film 3) are peeled off from the prepreg 12 to obtain a printed circuit board 11B composed only of the prepreg 12. Several are manufactured.

  As shown in FIGS. 10A and 10B, a release material 1A or a release material 1B (not shown) according to the present invention includes a resin-coated copper foil 15 in which an adhesive resin 14 is applied to a copper foil 13 as a core material. It is also used for manufacturing a multilayer printed circuit board 11C that is bonded to 16 and laminated. On both sides of the core material 16, the resin-coated copper foil 15, the release material 1 </ b> A or the release material 1 </ b> B, and the mirror plate 4 are arranged in this order to constitute a laminate. A plurality of multilayer printed boards 11C are manufactured by stacking a plurality of the laminates, heating and pressing in the same manner as described above, and then disassembling the laminates. Here, the mold release material 1A or the mold release material 1B has a function as a mold release material and a copper foil 13 in addition to a function as a cover that receives the exudation of the adhesive resin 14 of the copper foil 15 with resin by heating and pressing. It also has the effect of preventing wrinkles.

  As described above, by using the release material 1A or the release materials 1A and 1B, the printed boards 11A, 11B, and 11C that have been adjusted to have flatness are used as the release materials 1A and 1B as the printed boards 11A, 11B, and 11C. It is manufactured without causing the problem that it is difficult to peel off from.

In addition, a method of using the release material will be described with an example of production using a solution casting method of a resin film that is one of the resin base substrates.
The solution casting method is difficult to produce by the melt extrusion method, which is a general method for producing resin films, and is easily melt-decomposable, a resin having a high melting point, such as polyester, polyimide, triacetylcellulose, diacetylcellulose, polychlorinated It is used when producing a resin film with vinyl, polyvinyl alcohol, polycarbonate or the like. And the resin film manufactured by the solution casting method has no orientation of the polymer and no directionality in strength and optical properties, high thickness accuracy, excellent smoothness, transparency and gloss. To polarizing films, polarizing film protective films, phase films and the like.

  In the solution casting method, as shown in FIG. 11, first, a resin solution in which a resin is dissolved in a solvent is poured from a hopper 31 onto a release material 1A (1B) fed by a plurality of feeding rollers 32. Adhere. That is, the release material 1A (1B) is used as a support for the resin solution. The release material 1A (1B) to which the resin solution is attached is fed into the heating means 33 such as an oven by the feeding roller 32. Inside the heating means 33, the solvent of the resin solution cast on the release material 1A (1B) evaporates, and a laminate in which the resin film 11D is formed on the release material 1A (1B) is manufactured. Next, the laminate composed of the release material 1A (1B) and the resin film 11D is sent out from the heating means 33 by a plurality of delivery rollers 34 and cooled. The cooled laminate is wound up by the winding drum 35. And resin film 11D is manufactured by peeling release material 1A (1B) from the wound laminated body.

  As described above, by using the release material 1A (1B), the resin film 11D is manufactured without causing a problem that the release material 1A (1B) is difficult to peel from the resin film 11D.

Thickness: 20 μm aluminum foil (1000 series alloy, yield strength: 140 MPa) on one side,
The resin paint shown in Table 1 was applied with a bar coater to form a resin coating film. Thereafter, a release material was produced by baking treatment under the conditions shown in the table.

  About the produced release material (No. 1-16), the peelability test was done in the following procedure, the adhesive strength of the resin coating film (release material) with respect to a printed circuit board was measured, and the peelability of the release material was evaluated. The results are shown in Table 1.

(Peelability test)
A copper foil (thickness: 18 μm) is disposed so as to face one surface of the prepreg, and is disposed so that the resin coating film of the release material faces the other surface of the prepreg. In addition, a stainless steel plate (thickness: 300 μm) is disposed so as to face the copper foil and the aluminum foil of the release material, and a laminate is obtained. And a hot plate is arrange | positioned at the upper and lower sides of this laminated body, the pressure of 30 kg / cm < ² > is applied to a hot plate at 180 degreeC for 1 hour, and the printed circuit board which consists of a prepreg which copper foil adhered is produced. As the prepreg, a prepreg (product name: GEA-67N, manufactured by Hitachi Chemical Co., Ltd.) in which a glass cloth is impregnated with an epoxy resin was used.

Next, the laminate is disassembled at room temperature, and the release material adhered to the prepreg side of the printed circuit board is peeled off at an angle of 90 degrees with respect to the surface of the prepreg at a rate of 50 mm / min (see JIS C6481). 6), the peel strength at that time was measured, and the maximum value was defined as the adhesive strength of the release material.
As evaluation criteria for peelability, peelability is good when the adhesive strength is 1 to 200 g / cm (◯), and peelability is poor when the adhesive strength is less than 1 g / cm or exceeds 200 g / cm (× ).

From the results of Table 1, it was confirmed that Examples (No. 1 to 10) were superior to Comparative Examples (No. 11 to 16) in peelability.
Moreover, in the said Example, although resin coating was apply | coated with the bar coater, even when apply | coated by the gravure coating method, it was excellent in peelability.

DESCRIPTION OF SYMBOLS 1A, 1B Release material 2 Aluminum foil 3 Resin coating film 4 Mirror surface plate 5 Hot plate 11A, 11B Printed circuit board 11C Multilayer printed circuit board 11D Resin film 12 Prepreg 13 Copper foil 14 Adhesive resin 15 Copper foil with resin 16 Core material S1 Application process S2 Baking process

Claims (10)

A release material for a resin base substrate used for manufacturing a resin base substrate,
Aluminum foil,
Formed on one or both sides of the aluminum foil, and comprising a resin coating film comprising an epoxy resin, a melamine resin and silicone,
A release agent for a resin base substrate, wherein an adhesive strength of the resin coating film to the resin base substrate is 1 to 200 g / cm.   The release material for a resin base substrate according to claim 1, wherein the resin coating film has a thickness of 0.5 to 5 μm.   3. The release material for a resin base substrate according to claim 1, wherein the resin coating film is 0.07 to 3 parts by mass of silicone with respect to 100 parts by mass of the epoxy resin. The one or more surface roughening particles selected from SiO ₂ , MgO, Al ₂ O ₃ , BaSO ₄ and Mg (OH) ₂ are further contained in the resin coating film. The mold release material for resin base substrates as described in any one of Claims 3.   5. The release material for a resin base substrate according to claim 4, wherein a particle diameter of the roughened particles is 15 nm to 4 μm.   The mold release material for a resin base substrate according to claim 1, wherein the resin base substrate is a resin base printed substrate. It is a manufacturing method of the mold release material for resin base boards according to any one of claims 1 to 3,
An application step of forming a resin coating film on one or both sides of an aluminum foil by applying a resin coating composed of an epoxy resin as a main agent, a melamine resin as a curing agent, and silicone as a release agent;
And a baking step of baking the resin coating film at 125 to 240 ° C. for 0.5 to 60 seconds. A method for producing a mold release material for a resin base substrate. It is a manufacturing method of the mold release material for resin base boards according to claim 4 or 5,
On one or both sides of the aluminum foil, an epoxy resin as a main agent, a melamine resin as a curing agent, silicone as a release agent, SiO ₂ , MgO, Al ₂ O ₃ , BaSO ₄ and Mg (OH) ₂ An application step of applying a resin paint comprising one or more types of surface roughening particles selected from the above to form a resin coating film;
And a baking step of baking the resin coating film at 125 to 240 ° C. for 0.5 to 60 seconds. A method for producing a mold release material for a resin base substrate.   9. The method for producing a release material for a resin base substrate according to claim 7, wherein in the applying step, the resin paint is applied to one side or both sides of an aluminum foil by a gravure coating method.   The method for producing a release material for a resin base substrate according to claim 7, wherein the resin base substrate is a resin base printed substrate.

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