JP2001138467A - Method for manufacturing sheet-like multi-layered laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a sheet-like laminating mate rial by which it is possible to industrially manufacture a sheetlike multi-layered laminate having an interlayer adhesive force with high efficiency. SOLUTION: This method for manufacturing a sheetlike multi-layered laminate includes the step to heat the sheet-like multi-layered laminate comprising at least one layer of a sheet material laminated on a base sheet through an adhesive, in such a state that the laminate is wound around a core material more than 150 times in a roll-shaped fashion and under conditions pressurized by gas and at temperature below the melt point of a sheet member constituting the sheet-like multi-layered laminate for 12 or more hours.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a sheet-like laminate formed by laminating a plurality of sheets, which can be used as a functional material having a laminated structure for various electronic equipment parts. .

2. Description of the Related Art A laminated structural functional material widely used as a component of various electronic devices such as a computer, a printer, an electronic camera, a video recorder, and a portable communication device includes:
The performance has been greatly affected by the strength of the adhesive layer used to form a laminated structure.

If the strength of the adhesive layer in the laminated structure is low, the performance of electronic device parts may not be sufficiently exhibited, or deterioration with time may occur, resulting in failure of the device. In general, these electronic devices are required to have high quality performance reliability, and there must be no reduction in strength between materials of the laminated structure and no delamination. The adhesive strength between the laminates and the stability of the adhesive strength do not depend only on the composition of the adhesive itself, but have a great influence on the physical and chemical surface conditions and dirt conditions of the sheet material to be bonded. However, it is also greatly affected by gas or water, such as air or gas, existing between the adhesive and the adherend or in the adhesive. here,
The physical and chemical surface conditions and stains of the sheet material to be bonded can be dealt with by pretreatment of the sheet material, but the air and gas existing between the adhesive and the adherend and in the adhesive It is very difficult to industrially remove such gases and water. On the other hand, as a method of manufacturing a laminate sheet, for example, Japanese Patent Publication No. 2-26581 discloses that a fiber based on an aromatic polyamide is cured between two aluminum alloy sheets when heated to 120 ° C. Put the adhesive of the type that can be done, layer on the movable support,
In an autoclave, at a pressure of 6 bar and a temperature of 1
It is specified that the laminate is manufactured by raising the temperature to 20 ° C. and heating for 30 minutes (column 7, line 14 to column 8, line 8). Japanese Patent Application Laid-Open No. 63-182149 discloses that when laminating a laminated sheet in an autoclave, it is only necessary to consider laminating with care so that the foil surface of the laminated sheet does not come into contact with another foil-bonded metal plate. This was described (lower left column on page 3), and a rack capable of supporting only both ends of the laminate was prepared. A space of 1.5 mm was provided in this rack, and one copper-clad plate was inserted every 2.5 mm to obtain a total. 20
This rack was placed in an autoclave containing zero laminates, and the pressure was increased to 7 kg / cm3 in 10 minutes, and then raised from room temperature to 200 ° C. in 20 minutes, and 1
It is disclosed to hold for 0 minutes and then cool for 20 minutes. In these methods, it is difficult to efficiently control the generation and size of a gas generated in the adhesive layer, particularly, a bubble-shaped void (hereinafter, referred to as a bubble), and requires a support or a special rack. It is difficult to process long laminates without taking up a lot of space.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a sheet-like laminated material capable of industrially and extremely efficiently producing a sheet-like multilayer laminate having excellent interlayer adhesion. And

SUMMARY OF THE INVENTION The present invention provides at least one
After preparing the sheet-like multilayer laminate by laminating the sheet material of the layer on the base sheet via an adhesive, the multilayer laminate is wound around a core member so as to have a specific number of turns, and is applied by gas. When heated for 12 hours or more under pressure conditions, it is possible to efficiently control the generation of a space due to gas in the adhesive layer, particularly the generation and size of bubbles, and to produce a sheet-like multilayer laminate excellent in interlayer adhesion. It was based on the knowledge that it could be done.

That is, according to the present invention, a sheet-like multilayer laminate obtained by laminating at least one layer of a sheet material on a base sheet via an adhesive is formed into a roll with a core member having 150 or more turns. In a state where the sheet-like multilayer laminate is heated under a pressure of gas under a temperature of less than the melting point of the sheet member constituting the sheet-like multilayer laminate for 12 hours or more, provide.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The sheet-like multilayer laminate intended in the present invention means a flexible sheet-like multilayer laminate which can be bent and deformed relatively easily by physical force. This sheet-like multilayer laminate is formed by laminating at least one layer of a sheet material via a bonding agent, regardless of the same kind or different materials, on a base sheet, and specifically has a two-layer structure. Or a three-layer structure or a structure having four or more layers. As the base sheet as the first sheet member,
Metal sheets and synthetic resin sheets are mentioned, and especially, the thickness is 1
mm or less, more preferably 500 μm
It is as follows. Here, the metal sheet is preferably a metal foil. For example, in addition to copper foil, aluminum foil, zinc foil, tin foil, iron foil, nickel foil, lead foil, and other alloys such as stainless steel foil, plating treatment, oxidation treatment, etc. And foils made of various metal alloys.

The synthetic resin sheet may be a thermoplastic resin sheet or a thermosetting resin sheet, and is not particularly limited, but a thermoplastic resin sheet which is difficult to heat and fuse is preferred. The synthetic resin sheet may be composed of one layer, or may be a multilayer laminated sheet. Among them, polyethylene terephthalate, polybutylene terephthalate, polyphenylene sulfide, polyimide,
Sheets of polyethylene naphthalate, polystyrene, polycarbonate, polyvinyl alcohol, polyurethane, cellulose, acrylic, nylon, and fluororesin are preferred. As the second sheet member, the third sheet member, or more sheet members laminated on the base sheet as the first sheet member via an adhesive, the above-mentioned metal sheet or synthetic resin sheet is used. can give.

[0007] A preferred layer configuration of the sheet-like multilayer laminate is such that the first sheet member (base sheet) is a metal foil,
The second sheet member laminated thereon is a two-layer structure composed of a metal sheet or a synthetic resin sheet (more preferably a metal sheet), and the first sheet member (base sheet) is a metal foil. The second sheet member laminated on the sheet is a metal sheet or a synthetic resin sheet (more preferably a synthetic resin sheet), and the second sheet member laminated thereon is a metal sheet or a synthetic resin sheet (more preferably a metal sheet). )
And a three-layer structure comprising: The thickness of the sheet-like multilayer laminate of the present invention may be any thickness,
Or less, and more preferably 2 mm or less.

The adhesive used in the present invention is an acrylic, rubber, silicone, polyester or polyurethane pressure-sensitive adhesive (hereinafter abbreviated as "adhesive").
Is raised. Acrylic adhesives include butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isononyl (meth) acrylate, octyl (meth) acrylate, methyl (meth) acrylate,
Alkyl (meth) acrylates such as ethyl (meth) acrylate, acryl (meth) acrylates such as benzyl (meth) acrylate, cyclohexyl (meth) acrylate, and tetrahydrofuryl (meth) acrylate have an aromatic group and a fatty acid. 2-hydroxyethyl (meth) acrylate, hydroxy, acrylate substituted with a cyclic group, a heterocyclic group or a halogen atom, and a substance having an acryloyl group such as vinyl acetate, vinyl ether, styrene, acrylonitrile, etc. (Meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, hydroxyacrylates such as N-methylolacrylamide, acrylic acid, methacrylic acid, crotonic acid,
Acrylic carboxylic acids such as maleic acid, fumaric acid, itaconic acid, citraconic acid, acrylamide, methacrylamide, N-methyl (meth) acrylamide, N-methoxymethyl (meth) amide, N-ethoxymethyl (meth)
Acrylamide, N-butoxymethyl (meth) acrylamide, N-propoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N-
Homopolymers or copolymers synthesized using monomers generally used in the synthesis of acrylic polymers, such as acrylamides such as tert-butylacrylamide, N-octylacrylamide, diacetoneacrylamide, and glycidyl acrylates such as glycidyl (meth) acrylate It is a union, and there is no particular limitation on the polymerization method or molecular weight of the compound.

It is also possible to use a tackifier arbitrarily with the above compound as an adhesive main agent. Typical examples of the tackifier include rosin-based resins such as natural rosin such as gum rosin, tall oil rosin, wood rosin, and hydrogenated rosin. Rosin, polymerized rosin, modified rosin such as maleated rosin, rosin glycerin ester, hydrogenated rosin glycerin ester, polymerized rosin glycerin ester, rosin esters such as polymerized rosin pentaerythritol ester,
As the terpene-based resin, α-pinene, β-pinene, dipentene, limonene and the like, terpene phenol, aromatic modified polyterpene, aliphatic modified polyterpene, terpene phenolic resin such as hydrogenated polyterpene,
Aromatic hydrocarbon modified terpene resins can also be used. Also,
As the synthetic resin, petroleum resins such as aliphatic, alicyclic, and aromatic resins, coumarone indene resins, styrene resins, xylene resins, phenol resins, and rosin-modified phenol resins can be used.

The pressure-sensitive adhesive can be crosslinked by adding a crosslinking agent. Hexamethylene diisocyanate, tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate,
m-xylene diisocyanate, p-xylene diisocyanate, 1,5-naphthalenediisocyanate, isophorone diisocyanate, lysine diisocyanate,
Diisocyanates such as hydrogenated 4,4′-diphenylmethane diisocyanate, hydrogenated tolylene diisocyanate,
Alternatively, a bifunctional isocyanate adduct with a glycol or a diamine, or a trifunctional isocyanate such as a dimer, trimer, multimer, triphenylmethane triisocyanate, or polymethylene polyphenyl isocyanate of these isocyanates may be used. Is also possible. Other crosslinking agents include melamine-based resins, epoxy-based resins, metal chelates, aziridine-based resins, oxazoline-based resins, and the like.If these crosslinking agents have a crosslinking reaction function, types and compounds can be used. There is no particular limitation on the amount of addition.

Further, natural rubber (NR), styrene / butadiene copolymer rubber (SB)
R), polyisopropylene (PIB), isobutylene / isoprene copolymer rubber (butyl rubber: II
R), thermoplastic rubber (styrene / isoprene / styrene block copolymer, SIS or styrene / butadiene / styrene block copolymer, SBS or styrene / ethylene / butadiene / styrene: SEBS). Further, chloroprene rubber (CR), butadiene / acrylonitrile copolymer rubber (NBR), polybutadiene (BR) and the like can be mentioned. Furthermore, these can be masticated, mixed, mixed with powder, vulcanized, and an auxiliary agent can be added, and the tackifier shown in the acrylic pressure-sensitive adhesive can also be arbitrarily added. Polyester-based, urethane-based, and silicone-based pressure-sensitive adhesives can be mixed and treated in the same manner as acrylic-based pressure-sensitive adhesives, and can be widely used as long as they have a function as pressure-sensitive pressure-sensitive adhesives.

Further, thermosetting adhesives can be used as the adhesive, such as phenol, resorcinol,
Formaldehyde resins such as urea, melamine, benzoguanamine, furan, xylene, epoxy resins, unsaturated polyester resins, polydiallyl phthalate or condensates thereof, bismaleimide, triazine, bismaleimide triazine, etc., and are generally thermosetting resins Any substance can be used without particular limitation as long as it is classified as. Further, typical examples of the thermoplastic resin that can be used as the adhesive in the present invention include polyvinyl acetate, polymethyl acrylate, polystyrene, polyvinyl alcohol, polyvinyl butyral, methyl cyanoacrylate, polysulfone, polyimide, and polybenzo. There are imidazole, nylon, polyethylene, polypropylene, polyester, polyurethane, ethylene vinyl acetate, cellulose and the like, and any material can be used without particular limitation as long as it is generally classified as a thermoplastic resin.

As a typical example of the rubber-based adhesive, any material which is generally classified as a rubber-based adhesive in the same manner as the composition of the rubber-based pressure-sensitive adhesive can be used without any particular limitation.
Although the representative adhesive applied to the present invention has been described above,
It should be determined according to the required properties of a given multilayer laminate, and does not limit the composition of the adhesive, but it can be used as a mixture, copolymer, block, or graft of the composition. , A cross-linking agent, a powder mixture, an auxiliary agent and the like can also be used.

Among the above-mentioned adhesives, in the present invention, it is more preferable to use an adhesive obtained by adding an optional amount of a cross-linking agent to a thermoplastic and thermosetting adhesive. In the present invention, the adhesive can be applied to the substrate sheet or at least one layer of sheet material thereon to an arbitrary thickness, but the thickness is determined by the required characteristics of a predetermined laminate. It is preferable that the thickness be 500 μm or less, and more preferably 100 μm or less. The adhesive is
It can be applied on a substrate sheet or on at least one layer of sheet material thereon by a conventional method. However, in the case of small-scale production, a single sheet is applied using a mylar bar, an applicator, or a silk screen. Although production is possible, it is preferable to use a comma, a reverse, a direct gravure, a microgravure, a die,
It is preferable to apply by various coating methods such as air knife, bar, bead, curtain, spray, blade and the like. In the present invention, first, after applying an adhesive on a base sheet, a second sheet is laminated thereon, and then, if desired, an adhesive is further applied on the second sheet. By repeating the laminating operation in order such as laminating the sheets, a sheet-like multilayer laminate having a desired layer configuration can be manufactured. In addition, the width and length of the sheet-like multilayer laminate of the present invention can be arbitrarily set.

The above lamination step can be performed at room temperature, but can also be performed at a high temperature such as 300 ° C. or higher. In the case where a solvent evaporation type adhesive is used in the laminating step, it is preferable to remove the solvent by evaporation after the adhesive is applied and before the sheet member is placed on the adhesive and laminated.
Heating can be performed by a conventional method such as hot air heating. or,
When laminating the sheet member on the adhesive layer, it is preferable to laminate the sheet member by applying pressure, and it is more preferable to laminate the sheet member by applying pressure while heating. The feature of the present invention is that the multilayer laminate obtained in the above manufacturing process is subjected to a heating action under further pressurized conditions, wherein the requirement for pressurization is that the multilayer laminate is pressurized by gas. Yes, the requirement for heating is that the heating is performed at a temperature of 30 ° C. or higher and lower than the melting point of the sheet member constituting the multilayer laminate. At this time, it is preferable to pressurize and heat the entire multilayer laminate. Specifically, the multilayer laminate is preferably housed in a closed container, preferably an autoclave, and pressurized and heated. At this time, the sheet-like multilayer laminate is formed into a core material, for example, a circular column or cylindrical one having a cross section of about 70 to 200 mm in diameter, and the number of turns is 150 or more, preferably 250 or more.
It is more preferably 300 or more, and preferably 4000 or less, still more preferably 2000 or less, particularly preferably 300 to 2000, and more preferably housed in an autoclave in a rolled state. On this occasion,
It is preferable that both ends of the core material around which the sheet-shaped multilayer laminate is wound are supported by the support columns so that the lowermost portion of the sheet-shaped multilayer laminate does not contact the bottom surface of the autoclave. More preferably, the core is rotated in an autoclave together with the sheet-like multilayer laminate wound on the core.

The conditions for the pressing are as follows:
Although it should be determined according to the properties of the material and the adhesive, in practice, the gauge pressure is preferably 40 KPa or more, more preferably 100 to 500 KPa.
It is. The condition of the heating temperature is a temperature lower than the melting point of the sheet member constituting the sheet-like multilayer laminate, and a temperature within a range where the adhesive is cured. It is preferably 100 ° C or lower, particularly preferably 40 to 60 ° C. The heating time under pressure is 12 hours or more, preferably 24 hours or more, and particularly preferably 3 to 10 days.

[0017]

According to the method of the present invention, it is possible to control and suppress the size of bubbles in the adhesive layer of the multilayer laminate, and it is necessary to provide a uniform adhesive force required for various electronic device parts. Thus, a multilayer laminate useful as a highly accurate and highly reliable material can be manufactured. In addition, by controlling the size of the bubbles, uniformity and fineness can be achieved, so that the adhesive strength of the product is improved, and the non-uniformity of the adhesive strength is reduced. In particular, the product is wound in a roll shape. , Can use less space,
Productivity can be improved. Also, in the adhesive design, it is possible to control bubbles in a system in which by-products are generated by a chemical reaction, so that the design range is expanded, and an adhesive design suitable for the application is made possible. Next, the present invention will be described with reference to examples.

[0018]

EXAMPLE 1 An adhesive having the composition shown in Table 1 was applied to an electrolytic copper foil (a) (thickness: 35 μm, width: 210 mm, length: 297 m) using an applicator so that the adhesive layer was uniform. It was applied to form an adhesive layer (b) (application thickness: 20 μm). After applying the adhesive, heat drying at 120 ° C. for 20 seconds is performed to dry the diluted solvent, and then an electrolytic copper foil (c) similar to the electrolytic copper foil (a) is placed on the laminate roll using a laminating roll. Lamination was performed to produce a laminate having a two-layer structure shown in FIG. This laminate is wound around a cylinder having a diameter of 200 mm (the number of turns is 41).
0), put in an autoclave, temperature 50 ° C, forced pressure 1
Pressure and heat treatment was performed for 7 days under the conditions of 00 KPa (gage pressure) (the conditions of the pressure and heat treatment were as follows: 50 ° C. × 100
KPa × 7 days). At this time, both ends of the core material around which the sheet-like multilayered product was wound were supported by using a support so that the lowermost portion of the sheet-like multilayered product did not contact the bottom of the autoclave. Example 2 Aluminum foil [A1N30H] as sheets (a) and (c)
-O (JIS-H-4160): thickness 30 μm, width 21
0 mm, length 297 m], and the thickness of the adhesive layer (b) was set to 3 μm using the adhesive shown in Table 1 as an adhesive. A laminate having a layer structure was manufactured. 45 ° C x as pressure and heat treatment conditions
Pressure and heat treatment were performed in the same manner as in Example 1 except that 100 KPa × 3 days was adopted. Example 3 SUS foil (SUS30) was used as sheets (a) and (c).
4: thickness 50 μm, width 210 mm, length 297 m) and the same procedure as in Example 1 except that the thickness of the adhesive layer (b) was 5 μm using an adhesive A as an adhesive.
Was manufactured. The pressure and heat treatment was performed in the same manner as in Example 1 except that the conditions of the pressure and heat treatment were 50 ° C. × 100 KPa × 10 days.

[0019]

[Table 1] Table-1 Formulation solids loading (parts by weight) adhesive Lee polyester - epoxy base resin 51.0% 100.0 Torirenshi Bu isocyanate - DOO trimethylol - Help Loja ° N'ata Bu transfected 75.0% 10.0 ethyl acetate - 110.0 adhesive B polyester base resin 30.0% 100.0 Torirenshi Bu isocyanate - DOO trimethylol - Help Loja ° N'ata Bu transfected 75.0% 6.0 ethyl acetate - 71.6

Example 4 An adhesive A having the composition shown in Table 1 was applied to an electrolytic copper foil (a) [thickness 35 μm, width 210 mm, length 297 m] using an applicator so that the adhesive layer was uniform. Thus, an adhesive layer (b) was formed (application thickness: 20 μm). After the adhesive is applied, heat drying at 120 ° C. for 20 seconds is performed to dry the diluted solvent, and then a PET film (c) (Lumilar # 25S10 manufactured by Toray Industries, Inc .: thickness 25 μm, width 210 mm, 297 m in length) and laminated thereon. On top of that, an adhesive A was further applied using an applicator so that the adhesive layer was uniform to form an adhesive layer (d) (application thickness 20 μm). After applying the adhesive, 120 ° C x 20 to dry the diluted solvent
After performing heat drying for 2 seconds, an electrolytic copper foil (e) similar to the electrolytic copper foil (a) was placed thereon and laminated by a laminating roll, and a laminate having a three-layer structure shown in FIG. 2 was produced. . The laminate was wound around a 200 mm diameter cylinder (384 turns), placed in an autoclave, and subjected to pressure and heat treatment at a temperature of 50 ° C. and a forced pressure of 100 KPa (gage pressure) for 7 days.

Example 5 Aluminum foil [A1N30H] was used as the sheets (a) and (e).
-O (JIS-H-4160): thickness 30 μm, width 21
0 mm, length 297 m], and the thickness of the adhesive layers (b) and (d) was 3 μm using the adhesive b shown in Table 1 as the adhesive.
m in the same manner as in Example 4 except that
A laminate having a layered structure was manufactured (400 turns). Pressure / heat treatment was performed in the same manner as in Example 4 except that 50 ° C. × 50 KPa × 4 days were employed as the pressure / heat treatment conditions. Example 6 SUS foil (SUS30) was used as sheets (a) and (e).
4: Using a PPS film as a sheet (c) using a thickness of 50 μm, a width of 210 mm, and a length of 297 m (Toray Co., Ltd., Torelina 1000 # 9 double-sided corona discharge treated product: thickness 9)
FIG. 2 shows the same manner as in Example 4 except that the thickness of the adhesive layers (b) and (d) was set to 5 μm using an adhesive A as an adhesive. A laminate having a three-layer structure was manufactured (winding number: 385). Pressure / heat treatment was performed in the same manner as in Example 4 except that 50 ° C. × 100 KPa × 10 days were employed as the pressure / heat treatment conditions. Comparative Examples 1 to 6 The pressure and heat treatment conditions in Examples 1 to 6 were not adopted,
Instead, comparative examples 1 to 6 were changed to normal temperature and normal pressure, respectively.

[0022]

[Table 2] Table-2 Material (a) (c) (e) Material type Thickness Material type Thickness Material type Thickness (μm) (μm) (μm) Example 1 Electrolytic Cu foil 35 Electrolytic Cu foil 35 --- Comparative example 1 Example 2 A1N30H- O 30 A1N30H-O 30-- Comparative Example 2 (Aluminum foil) (Aluminum foil) Example 3 SUS304 50 SUS304 50-- Comparative Example 3 (SUS foil) (SUS foil) Example 4 Electrolytic Cu foil 35 PET film 25 Electrolytic Cu foil 35 Comparative example 4 Example 5 A1N30H-O 30 PET film 25 A1N30H-O 30 Comparative example 5 (Aluminum foil) (Aluminum foil) Example 6 SUS304 50 PPS film 9 SUS304 50 Comparative example 6 (SUS foil) (SUS Foil)

The physical properties of the multilayer structure manufactured through the pressing and heating steps as described above were measured by the following methods. The adhesive strength was measured based on JIS K 6854 floating roller peeling test. In Examples 4 to 6 and Comparative Examples 4 to 6, the results of measurement when the sheet (a) / sheet (e) were peeled off are shown. Specimen size 130 mm × 130 mm with a maximum bubble diameter optical microscope
The largest bubble in the inside was confirmed, and the diameter of the bubble was measured. The results are shown in Table-3.

[0024]

[Table 3] Table-3 Example Maximum bubble diameter (μm) Adhesive force (g / 10mm) Immediately after lamination Example 1 40 5 or less 900 Comparative example 1 40 1000 or more 750 Example 2 60 5 or less 600 Comparative example 2 60 1000 or more 450 Example 3 30 5 or less 1450 Comparative Example 3 30 500 or more 1350 Example 4 40 5 or less 850/800 Comparative Example 4 40 10000 or more 700/680 Example 5 60 5 or less 550/530 Comparative Example 5 60 5000 or more 420/430 Example 6 30 5 or less 450/430 Comparative Example 6 30 5000 or more 370/350

As is evident from the results in Table 3, when the multilayer laminate was manufactured and allowed to stand at atmospheric pressure (Comparative Example), the maximum bubble diameter in the adhesive layer of the multilayer laminate was as follows: 10000
μm or more, but when a pressure / heating step is performed according to the present invention (Example), the maximum bubble diameter becomes as small as 5 μm or less,
A high bubble suppression effect was confirmed. Then, as is clear from the comparison between the comparative example and the example, it can be seen that when the maximum bubble diameter in the adhesive layer is small, the adhesive strength is high. Example 7 An adhesive A having a composition shown in Table 1 was used for SUS foil (a) [SU
S304, thickness 80 μm, width 145 mm, length 50 m] using a gravure roll (hatched plate: 80 lines) so that the adhesive layer was uniform to form an adhesive layer (b) (application thickness 18). １９19 μm). After the adhesive was applied, heat drying at 120 ° C. for 20 seconds was performed to dry the diluted solvent.
SUS foil having adhesive layer thus obtained (a)
SUS foil (b) immediately before the heat laminating roll
[SUS304, thickness 30 μm, width 145 mm, length 50
m] and heat laminating roll (temperature 5
By passing through 0 ° C. and a pressure of 0.61 MPa), a laminate having a two-layer structure was produced. The above steps were continuously performed, and the produced two-layer laminate was wound into a cylinder having a diameter of 76 mm in a roll shape (number of turns: 170). This was put into an autoclave, pressurized and heated under the conditions of a temperature of 53 ° C. and a forced pressure of 200 KPa (gage pressure), and sampled at predetermined intervals for 3 to 168 hours to evaluate the state of generation of bubbles. At this time, both ends of the core material around which the sheet-like multilayered product was wound were supported by using a support so that the lowermost portion of the sheet-like multilayered product did not contact the bottom of the autoclave. Example 8 A sheet-like multilayer laminate was obtained in the same manner as in Example 7, except that the forced pressure in the autoclave was set to 500 KPa (gage pressure). The SUS foil (b) side of the sheet-like multilayer laminate obtained in Examples 7 and 8 was brought into contact with ferric chloride (concentration: 42 ° Be) at room temperature to completely dissolve and remove the SUS foil (b). Then, the number of bubbles per 10 cm ^{2 of} the appeared adhesive layer was measured with a microscope (magnification: 50 times). The results are shown in Table-4.

[0026]

[Table 4] Table-4 The number of bubbles per between 1 cm ² heating and pressurization (number) (times) Example 7 Example 8 3 744 1005 6 170 315 9 108 138 12 19 31 24 6 10 48 0 0 72 0 0 168 0 0

From these results, it can be seen that when the processing time exceeds 12 hours, the amount of air bubbles decreases drastically, and when the processing time exceeds 24 hours, the amount decreases further.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a laminate having a two-layer structure of the present invention manufactured in Examples 1 to 3.

FIG. 2 is a cross-sectional view of a laminate having a three-layer structure of the present invention manufactured in Examples 4 to 6. In the figures, (a), (c) and (e) are sheet members, and (b) and (d) improve the force of the adhesive layer n and control the generation of gas and the shape of bubbles in the adhesive layer. Indicates the sheet to be used.

Continuing from the front page (72) Inventor Shoichi Sueyama 2773-2 Takenoshita, Koyama-cho, Sunto-gun, Shizuoka Prefecture F-term in the Koyama Plant of Panak Co., Ltd. 4F100 AB01A AB17 AB33 AK01A AK41G AK51G AK53G AT00A AT00B BA02 CB00 EC182 EH012 EH46 EJ192 EJ212 EJ422 EJ942 GB41 JK06 JL02

Claims (5)

[Claims] 1. A sheet-like multilayer laminate obtained by laminating at least one layer of a sheet material on a base sheet via an adhesive is wound into a core member in a roll shape with 150 or more turns. A method for producing a sheet-like multilayer laminate, characterized in that the sheet-like multilayer laminate is heated at a temperature lower than the melting point of the sheet member constituting the sheet-like multilayer laminate for 12 hours or more under a gas pressurizing condition. 2. The heating time is 24 hours or more.
The manufacturing method as described. 3. The method according to claim 1, wherein the gas pressure is 40 KPa or more, the heating temperature is 30 ° C. or more, and the melting point is lower than the melting point of the sheet material constituting the multilayer laminate. 4. The method according to claim 1, wherein the base sheet is a metal foil. 5. The method according to claim 1, wherein the sheet material is a metal foil or a synthetic resin sheet.