WO2007105602A1

WO2007105602A1 - Hot melt adhesive sheet, display material and method for producing laminate

Info

Publication number: WO2007105602A1
Application number: PCT/JP2007/054584
Authority: WO
Inventors: Shigeki Nishimura
Original assignee: Mitsubishi Plastics, Inc.
Priority date: 2006-03-10
Filing date: 2007-03-08
Publication date: 2007-09-20
Also published as: JPWO2007105602A1

Abstract

Disclosed is a hot melt adhesive sheet which is composed of a multilayer sheet including a thermoplastic resin layer as an intermediate layer and hot melt adhesive layers arranged on both sides of the thermoplastic resin layer. The layers of the multilayer sheet are formed all at once by co-extrusion. This hot melt adhesive sheet has good handleability, and makes bonding operations easy. For example, this hot melt adhesive sheet enables to laminate a printed matter and a supporting body by exhibiting adequate adhesion at a temperature at which the supporting body such as a foam board is not thermally deformed and printing on the printed matter is not discolored.

Description

Specification

Hot melt adhesive sheet, display material, and laminate manufacturing method

The present invention relates to a hot melt adhesive sheet. More specifically, the present invention relates to a hot-melt adhesive sheet used for producing a display material by pasting a printed material on a support such as foam board, cardboard, and plastic board, and the produced display material.

Background art

[0002] Display materials such as sales promotion panels found in mass merchandisers and amusement halls have conventionally used paper and films that have been mass-printed by a printing press as supports such as foamed styrene boards and paperboard via adhesives. It has been produced by pasting together. In general, in order to use a large amount of printed matter having paper and film strength as a display material, a support such as a foamed polystyrene board or paperboard having a surface subjected to adhesive processing is used.

[0003] When producing a display material using a support that has been subjected to adhesive processing, air bubbles or wrinkles may enter between the printed material and the support in the actual bonding operation. It was easy for the trouble to occur. In addition, due to the characteristics of the adhesive, there is a problem that positioning and re-attachment are difficult because it cannot be removed once it is attached.

[0004] As a technique for solving such a problem, Patent Document 1 describes a multilayer hot melt film for adhering a skin material and a substrate. When a hot melt film is used, it is easy to handle because it has a high elastic modulus at normal temperature and does not exhibit adhesiveness, so it is easy to handle and can be laminated by thermocompression after positioning.

[0005] In Patent Document 2, paper, a hot-melt adhesive layer, and a release sheet are laminated in this order on a plate-like substrate, and the hot-melt adhesive is 40 ° C to 60 ° C. An exhibition panel base plate that exhibits adhesive activity in the temperature range is described.

Patent Document 1: JP-A-10-138418

Patent Document 2: Japanese Patent Laid-Open No. 11-305702

Disclosure of the invention

Problems to be solved by the invention [0006] However, the hot melt adhesive constituting the hot melt film described in Patent Document 1 uses a multilayer hot melt film having a high melting point to bond a printed material to a support at a high temperature. It was necessary to laminate with. When laminating at a high temperature, for example, when a foam board is used as a support, the foam board is thermally deformed, and a display with a smooth printed surface cannot be obtained. May cause the problem of discoloration.

[0007] Also, the display panel base plate described in Patent Document 2 is intended to solve the above problem by being able to be laminated at a low temperature. In order to produce, a transfer system was required for forming the hot melt adhesive layer. In addition, it was necessary to laminate paper in order to suppress foaming. For this reason, it was necessary to go through a two-step process, making it difficult to manufacture. In addition, since the display panel base plate of Patent Document 2 is already provided in the form of a plate-like substrate on which hot-melt adhesive is laminated, the user can flexibly apply other materials as a support. I could not respond.

[0008] Therefore, the present invention has good handleability and easy pasting work, for example, a temperature at which a support such as a foam board is not thermally deformed, and printing of printed matter is caused by heat. A hot-melt adhesive sheet that exhibits adhesiveness at temperatures that do not cause discoloration and can laminate the printed material and the support, and by using this hot-melt adhesive sheet, it can be flexibly applied to various adherends. In response to the above, an object of the present invention is to provide a method for producing a laminate that can easily produce a laminate such as a display material.

Means for solving the problem

[0009] The first aspect of the present invention is a multilayer sheet comprising a thermoplastic resin layer (10) as an intermediate layer, and hot-melt adhesive layers (20a, 20b) laminated on both surfaces thereof. Is a hot melt adhesive sheet (100) which is formed by coextrusion. Here, as a material for forming the hot-melt adhesive layer (20a, 20b), it is preferable to use a material having a melting point as low as possible and having non-tack properties at room temperature. Examples of adhesive resin include polyolefin resin such as ethylene acetate butyl copolymer resin, ethylene acrylate copolymer copolymer resin; polyester resin; polyurethane resin; Examples include xylene oxide-based resin. The hot melt adhesive layer (20a, 20b) may be formed of a single resin selected from these, or may be formed of two or more kinds of composite resins. Among these, it is preferable to use a polyalkylene oxide resin as the hot melt adhesive resin because it can exhibit hot melt properties at low temperatures.

[0010] The hot melt adhesive sheet (100) of the first present invention is provided with a hot melt adhesive layer, so that it is easy to handle and easy to laminate.

[0011] In the first present invention, the thermoplastic resin constituting the thermoplastic resin layer (10) includes polyethylene terephthalate, polybutylene terephthalate, polystyrene, acrylic resin, polylactic acid, polyvinyl chloride, and It is preferable that the resin is selected from the group consisting of polycarbonate, or a mixture of two or more types of resin selected from the group. By providing the thermoplastic resin layer (10) made of such a resin, rigidity can be imparted to the hot-melt adhesive sheet (100). Further, by selecting the thermoplastic resin based on the linear expansion coefficient, it is possible to reduce the difference in the linear expansion coefficient from the material to be bonded, such as a printed material and a support, to be bonded. This can prevent the display from warping due to the difference in linear expansion coefficient.

[0012] The hot melt adhesive sheet (100) of the first aspect of the present invention is disposed in a state where the hot melt adhesive sheet (100) is sandwiched between a first adherend and a second adherend. The first and second adherends can be used for bonding via the hot melt adhesive sheet by thermocompression bonding. Since the hot melt adhesive sheet (100) of the present invention is independent of the material to be adhered, it can flexibly cope with various materials to be adhered. Here, the “first adherend” and the “second adherend” are not particularly limited as long as they are sheet-like materials that can be bonded by the hot melt adhesive sheet (100) of the present invention. Examples include paper, wood, and resin sheet. This material to be bonded may be provided with printing or an embossed pattern. Examples of such an adherend include a printed material (60) and a support (50) as shown in FIG. Hereinafter, in the present specification, a case where the printed material (60) and the support (50) are employed as the adherend will be described, but this does not limit the range of the adherend.

[0013] Hot melt adhesive layer (20a, 20b) in hot melt adhesive sheet (100) of first invention It is preferable that the protective layer (30a, 30b) is laminated on at least one side of the protective layer (30a, 30b), and the protective layer (30a, 30b) is a layer mainly composed of polyolefin resin. Is preferred. Moreover, it is preferable that each layer of the hot-melt adhesive sheet (200) including the protective layers (30a, 30b) is collectively formed by coextrusion. Since the resin constituting the hot-melt adhesive layer (20a, 20b) is a low-melting hot-melt resin, when the hot-melt adhesive sheet (100) is cut and stacked, Blocking may occur due to heat. The protective layers (30a, 30b) have a role of preventing this blocking.

[0014] The second aspect of the present invention is a printed matter (60), a support (50), and the hot melt adhesive of the first aspect of the present invention sandwiched between the printed matter (60) and the support (50). A display material (300) comprising a sheet (100) and comprising a printed material (60) and a support (50) bonded together via a hot melt adhesive sheet (100).

[0015] A third aspect of the present invention is a method of manufacturing a laminate by bonding a first adherend and a second adherend, and includes a thermoplastic resin layer (10 ), A hot melt adhesive layer (20a, 20b) laminated on both surfaces thereof, and a protective layer (30a, 30b) laminated on at least one surface of the hot melt adhesive layer (20a, 20b) In the hot-melt adhesive sheet (200) configured as described above, the step of removing the protective layer (30a, 30b), the hot-melt adhesive sheet (100) from which the protective layer (30a, 30b) has been removed are A process of laminating the material to be bonded and the second material to be bonded, and thermocompression bonding, thereby bonding the first material to be bonded and the second material to be bonded to the hot melt adhesive sheet (100 And a step of adhering through the method of manufacturing a laminated body. The third method of the present invention is a method for producing a display material (200) using the first adherend as a printed matter (60) and the second adherend as a support (50). Can do.

[0016] According to the second and third aspects of the present invention, by using the hot melt adhesive sheet (100) independent of the printed matter (60) and the support (50), the printed matter on various supports (50). Display material (300) can be manufactured by pasting (60), and various display materials (300) suitable for each application can be easily manufactured. Further, since the hot melt adhesive sheet (100) that exhibits adhesiveness by heating is used, there is no problem of sticking at the time of alignment at the time of bonding. Hot melt adhesive sheet (100 ) Has a thermoplastic resin layer (10) as an intermediate layer and is given rigidity, so that the workability at the time of bonding is good. In addition, since the protective layer (30a, 30b) is provided on the surface during storage before lamination, blocking can be prevented.

[0017] In the third aspect of the present invention, the thermocompression bonding is preferably performed by heating the hot melt adhesive sheet (100) to 60 ° C to 120 ° C. By thermocompression bonding at such a temperature, thermal deformation of the support 50 such as foam board and discoloration of printing of the printed material 60 are prevented, and the printed material (60) and the support (50) are bonded. be able to.

[0018] In the first to third aspects of the present invention, the hot-melt adhesive layers (20a, 20b) are composed mainly of a resin (polyalkylene oxide) represented by the following general formula (1). It is preferable that the layer be a layer.

[0019] [Chemical 1]

• A'X'A'R ¹ (1)

[In the general formula (1), X ¹ is a residue of an organic compound having two or more active hydrogen groups, R ¹ is a dicarboxylic acid compound residue or a diisocyanate compound residue, and A ¹ is It is represented by the following general formula (2).

[0020] [Chemical 2]

In the general formula (2), Z is a hydrocarbon group having 1 or more carbon atoms, a, b and c are each an integer of 1 or more, and a mass ratio calculated from a, b and c, (44 (a + c) Z (molecular weight of at-oleinoxide having 3 or more carbon atoms) X b} is 80Z20 to 94Z6. ]

[0021] Here, the molecular weight of (X-oleinoxide having 3 or more carbon atoms is defined as [0022] [Chemical Formula 3] in the formula (2).

CH ₂ CHO Means the molecular weight of

[0023] By forming the hot-melt adhesive layer (20a, 20b) from the polyalkylene oxide as described above, a hot-melt adhesive sheet (100) having good handleability and easy bonding work is obtained. For example, when the printed product (60) and the support (50) are used for bonding, the printed product (60) is printed at a temperature at which the support (50) such as foam board does not thermally deform. The printed material (60) and the support (50) can be laminated at such a temperature that does not change color.

The invention's effect

[0024] The hot melt adhesive sheet (100) of the first aspect of the present invention is provided with the hot melt adhesive layers (20a, 20b), so that the handling property is good and the laminating work is easy. In addition, when the hot melt adhesive layer (20a, 20b) is composed of polyalkylene oxide, which is a preferable material, for example, when used for the purpose of adhering a printed material (60) and a support (50), Laminate the printed material (60) and the support (50) at such a temperature that the support (50) of the board or the like is not thermally deformed and at a temperature at which the printing of the printed material (60) does not change color. Can do.

[0025] Further, according to the second and third aspects of the present invention, the display material (300) can be produced by pasting the printed material (60) on various supports (50). A variety of suitable display materials (300) can be easily manufactured. Further, blocking can be prevented during storage before lamination.

Brief Description of Drawings

FIG. 1 (a) is a conceptual diagram showing a layer configuration of a hot melt adhesive sheet 100, and (b) is a conceptual diagram showing a layer configuration of a hot melt adhesive sheet 200.

FIG. 2 is a conceptual diagram showing a layer structure of a display material 300 produced by pasting a printed material 60 and a support 50 using the hot melt adhesive sheet 100 of the present invention.

Explanation of symbols

[0027] 10 Thermoplastic resin layer

20a, 20b Hommel adhesive layer

30a, 30b Protective layer

50 Support 60 Printed matter

100, 200 hommel adhesive sheet

300 Display material

BEST MODE FOR CARRYING OUT THE INVENTION

[0028] <Hot melt adhesive sheet>

FIG. 1 (a) shows the layer structure of the hot melt adhesive sheet 100 of the present invention. The hot-melt adhesive sheet 100 of the present invention has a thermoplastic resin layer 10 as an intermediate layer, and has hot-melt adhesive layers 20a and 20b laminated on both sides thereof. Hereinafter, each layer will be described.

[0029] (Hot-melt adhesive layer 20a, 20b)

As the hot melt adhesive for forming the hot melt adhesive layers 20a and 20b, it is preferable to use a material having a melting point as low as possible and having non-tack properties at room temperature. When the melting point of the hot melt adhesive is high, it is necessary to apply a large amount of heat during lamination, which may cause thermal deformation of the support 50 or discoloration of the printed material 60. In addition, when tackiness is exhibited at room temperature, adhesiveness is exhibited at room temperature, so that the workability is deteriorated even if the printed material 60 and the support 50 are aligned with each other.

[0030] From such a viewpoint, as the hot melt adhesive resin for forming the hot melt adhesive layers 20a and 20b, for example, ethylene vinyl acetate copolymer resin, ethylene acrylate copolymer resin Polyolefin resin such as polyester resin, polyurethane resin, polyurethane resin, and polyalkylene oxide resin. The hot melt adhesive layers 20a and 20b may be formed of a single resin selected from these forces, or may be formed of two or more kinds of composite resins. In addition, an inorganic filler can be added to the hot melt adhesive layers 20a and 20b in order to change the adhesive properties. Examples of the inorganic filler include talc and silica. Further, as an additive for adjusting the glass transition point, it is possible to add a resin having compatibility or semi-compatibility with the hot melt adhesive resin and having a different glass transition point.

[0031] Further, the hot melt adhesive layer 20a on the printed material 60 side and the hot melt adhesive layer 20b on the support 50 side may be provided with a difference in adhesive force by using different hot melt adhesives. For example, printing It is also possible to configure so that the printed material 60 can be exchanged by setting the adhesive strength of the hot melt adhesive layer 20a on the layer 60 side to be slightly weak so that the printed material 60 can be peeled off. Note that the method of providing a difference in adhesive strength is not limited to using different hot melt adhesives, and a difference may be provided by adding the above-mentioned additives.

[0032] For the hot-melt adhesive layers 20a and 20b that adhere between the printed matter 60 and the support 50, the present inventor changed the temperature at which the support 50 does not undergo thermal deformation and the printing of the printed matter 60 is discolored. However, we examined a material that can be bonded at a relatively low temperature, which is such a temperature. According to the inventor's study, if the melting point of the adhesive is too high, it is necessary to increase the amount of heat when laminating, which may cause deformation of the support 50 or discoloration of the printed material 60. There is a case. On the other hand, when the melting point of the adhesive is too low, the elastic modulus of the adhesive is lowered at room temperature, and stickiness may be manifested, resulting in poor handling.

[0033] The melting energy of the adhesive is preferably 140 j / g or less. If the melting energy of the adhesive is too large, the amount of heat consumed for melting the crystal during lamination increases, and sufficient adhesion cannot be exhibited when it is desired to laminate in a short time. Through these studies, the inventor found a specific polyalkylene oxide compound that is a resin having a melting point of 60 ° C. or less, a melting energy of 140 jZg or less, and a property capable of adhering to various materials. .

[0034] From the above viewpoint, in the present invention, the hot melt adhesive layers 20a and 20b are represented by the following general formula.

The layer composed mainly of polyalkylene oxide composed of the repeating unit represented by (1) was decided. This resin can be attached to various supports 50 used in the display material 300. In addition, it has a melting point of around 60 ° C and has no tack at room temperature. In addition, the melting energy is 140 jZg or less, and sufficient adhesion can be achieved by laminating in a short time.

[0035] [Chemical 4]

In general formula (1), “X ¹ ” is a residue of an organic compound having two active hydrogen groups, For example, ethylene glycol, propylene glycol, bisphenol A, a-line polypropylene glycol, polytetramethylene glycol and the like can be mentioned. “” Is a dicarboxylic acid compound residue or a diisocyanate compound residue, and as the dicarboxylic acid compound residue, a cyclic dicarboxylic acid compound or a linear dicarboxylic acid compound is desirable. , Dicarboxylic acid, dicarboxylic anhydride, and lower alkyl ester of dicarboxylic acid.

[0037] Examples of the dicarboxylic acid include phthalic acid, isophthalic acid, terephthalic acid, malonic acid, succinic acid, sebacic acid, maleic acid, fumaric acid, adipic acid, and itaconic acid. Examples of the dicarboxylic acid anhydride include anhydrides of the above various dicarboxylic acids.

[0038] Further, as the lower alkyl ester of the dicarboxylic acid, methinoreestenole, dimethinoreestenole, ethinoreestenole, jetinoreestenole, propylester, dipropylester, etc. of the above various dicarboxylic acids Is mentioned. Particularly preferred are linear dicarboxylic acids having 12 to 36 carbon atoms and lower alkyl esters thereof, such as 1,10-decamethylene dicarboxylic acid, 1,14-tetradecamethylene dicarboxylic acid, 1,18-octadecamylene dicarboxylic acid. Acid, 1,32-dotriacontane methylene dicarboxylic acid and the like.

[0039] Examples of the diisocyanate-based compound residue include 4,4'-diphenylmethane diisocyanate, toluene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, hexame Examples include tylene diisocyanate and isophorone diisocyanate.

Among the above, as “”, it is preferable to use the above dicarboxylic acid anhydride and the lower alkyl ester of dicarboxylic acid from the viewpoint of easy reaction. These can be used alone or in combination of two or more.

Further, “8 ¹ ” is represented by the following general formula (2).

[0042] [Chemical 5]

[0043] In the general formula (2), Z is a hydrocarbon group having 1 or more carbon atoms, and preferable examples include alkyl groups such as an ethyl group and a propyl group. a, b, c are each 1 or more It is an integer above, the mass ratio calculated from a, b, c, {44 X (a + c) Z (molecular weight of α-olefin oxide having 3 or more carbon atoms) X b} is 80Z20 ~ 94Z6.

[0044] Here, the molecular weight of a-refinoxide having 3 or more carbon atoms is defined by the formula (2).

[0045] [Chemical 6]

It means the molecular weight of CH ₂ CHO.

[0046] If this mass ratio is too small, the heat laminating property in a low temperature range is lowered, and if it is too large, the water resistance is poor. CZ (a + c) is set to 0.5 or more and less than 1.0.

[0047] Specific examples of the resin represented by the above general formula (1) include a polymer obtained by addition polymerization of ethylene glycol to ethylene glycol, addition polymerization of butylene oxide, and addition polymerization of ethylene oxide. Mention may be made of oxalate (weight average molecular weight: 150,000, melting point: 50 ° C., decomposition temperature: 230 ° C.) obtained by transesterification by adding methyl octadecane 1,18 dicarboxylate to alkylene oxide. . In addition, an anti-oxidant agent such as tocopherol can be added to the resin represented by the general formula (1), thereby avoiding problems such as thermal decomposition.

[0048] (Thermoplastic resin layer 10)

Since only the hot-melt adhesive layers 20a and 20b described above have poor film rigidity, the hot-melt adhesive sheet 100 of the present invention has the thermoplastic resin layer 10 as an intermediate layer. By having the thermoplastic resin layer 10, the handleability of the hot melt adhesive sheet 100 of the present invention is improved. In addition, by selecting the linear expansion coefficient as the thermoplastic resin forming the thermoplastic resin layer 10, the difference in linear expansion coefficient from the printed material or the support, which is the partner to be bonded, can be reduced. This can prevent the display from warping due to the difference in linear expansion coefficient.

[0049] Examples of the thermoplastic resin constituting the thermoplastic resin layer 10 include polyethylene terephthalate.

(PET), polybutylene terephthalate (PBT), polystyrene, acrylic resin, polylactic acid , Polyvinyl chloride (PVC), and polycarbonate. These rosins may be used alone or in admixture of two or more. Among these, PET and PBT are preferable because they can reduce a difference in linear expansion coefficient between a printed material having a low linear expansion coefficient and a support. In addition, a pigment can be added to the thermoplastic resin layer 10 in order to provide concealability, and a filler can be added to control rigidity and a linear expansion coefficient.

[0050] (Protective layer 30a ゝ 30b)

In the hot melt adhesive sheet 100 of the present invention, it is preferable that the protective layers 30a and 30b are laminated on at least one surface of the hot melt adhesive layers 20a and 20b. FIG. 1 (b) schematically shows a layer structure in which the protective layers 30a and 30b are stacked. Since the hot melt adhesive sheet of the present invention does not exhibit adhesiveness at room temperature as described above, it is excellent in handleability. However, it is preferable to provide the protective layers 30a and 30b in order to more reliably prevent blocking by heat that may be generated when the hot melt adhesive sheet 100 is cut and stacked or wound. The protective layers 30a and 30b are peeled off before being used as an adhesive sheet by being sandwiched between the printed material 60 and the support 50, for example.

[0051] As the material for the protective layers 30a and 30b, a material having high mold release properties such as fluorine resin, silicone-coated resin, polypropylene, and polyethylene can be used.

[0052] <Method for Producing Hot Melt Adhesive Sheet 100, 200>

The hot melt adhesive sheets 100 and 200 of the present invention are formed by batch extrusion by coextrusion. For example, a three-layer hot melt adhesive sheet 100 uses three extruders corresponding to each of the hot melt adhesive layers 20a and 20b and the thermoplastic resin layer 10, and a feed block or a multi-hold die. The film can be integrally formed by the coextrusion film forming method. The five-layer hot melt film 200 includes five extruders corresponding to the protective layers 30a and 30b, the hot melt adhesive layers 20a and 20b, and the thermoplastic resin layer 10, and a feed block or Using a multi-hold die, it can be formed integrally by co-extrusion film formation.

[0053] <Display material>

The structure of the display material 300 of the present invention is shown in FIG. The display material 300 of the present invention is , Printed matter 60, support 50, and hot melt adhesive sheet 100 of the present invention sandwiched between printed matter 60 and support 50, and printed matter 60 and support 50 are hot melt adhesive sheets. It is configured to be bonded through 100.

[0054] (Printed matter 60)

The printed material 60 can be, for example, general-purpose paper or a film whose surface is printed, and is not particularly limited. The display material 300 of the present invention is manufactured by a simple method using a general printed matter printed on such general-purpose paper.

[0055] (Support 50)

As the support 50, for example, a general-purpose foamed styrene board, paperboard or the like can be used, and is not particularly limited. Conventionally, for example, it has been necessary to purchase a foamed styrene board whose surface has been subjected to adhesive processing. In this case, there has been a problem that other materials cannot be handled flexibly. In addition, in the case where a general-purpose support is subjected to adhesion processing in a separate process, there is a problem in that the production efficiency deteriorates because the number of processes increases. On the other hand, the display material 300 of the present invention is manufactured by a simple method using a general-purpose support 50.

[0056] <Manufacturing Method of Display Material 300>

(Process to peel off protective layers 30a and 30b)

Prior to the manufacture of the display material 300, first, the hot melt adhesive sheet 200 described above is cut into a predetermined shape. The hot melt adhesive sheet 200 is preferably cut in accordance with the shape of the printed material 60 or the support 50. This is because it is preferable that the hot melt adhesive sheet 200 exists on the entire surface of the printed material 60 and the support 50 so that the surface of the printed material 60 is not uneven.

[0057] Then, the protective layers 30a and 30b are peeled off from the hot melt adhesive sheet 200 to obtain the form 100 shown in FIG. 1 (a). As described above, the protective layers 30a and 30b exist on the hot melt adhesive sheet until immediately before the operation of attaching the printed material 60 and the support 50. As a result, it is possible to prevent blocking when the hot melt adhesive sheet 200 is stored.

[0058] (Lamination process) The hot melt adhesive sheet 100 that has been cut into a predetermined shape and from which the protective layers 30a and 30b have been peeled off is laminated in a state of being sandwiched between the printed material 60 and the support 50. The hot-melt adhesive sheet 100 described above has the thermoplastic resin layer 10 as an intermediate layer, so that rigidity is maintained. As a result, in the laminating process, the hot melt adhesive sheet 100 can be stretched cleanly, and wrinkles and bubbles can be prevented. In addition, since the hot melt adhesive layers 20a and 20b have non-tack properties at room temperature, it is possible to easily perform alignment work that does not stick to the printed material 60 or the support 50 in the lamination process. Good quality.

[0059] (Thermocompression bonding process)

Thermocompression bonding is applied to the form obtained by sandwiching the hot melt adhesive sheet 100 between the printed material 60 and the support 50 obtained in the above laminating step. As a result, the printed material 60 and the support 50 can be bonded via the hot melt adhesive sheet 100 to produce the display material 300.

[0060] The hot-melt adhesive layers 20a and 20b in the hot-melt adhesive sheet 100 used in the method of the present invention are made of a resin that can be hot-melt bonded at a low temperature with a low melting point. Thus, the printed material 60 and the support 50 can be laminated at a temperature at which the support 50 such as a foam board is not thermally deformed and at a temperature at which printing of the printed material 60 is not discolored.

[0061] From such a point, in the manufacturing method of the display 300 of the present invention, it is preferable that the thermocompression bonding is performed by heating the hot melt adhesive sheet to 60 to 120 ° C.

Example

[0062] Production of hot melt adhesive sheet>

(Example 1)

Addition polymerization of ethylene oxide to ethylene glycol, followed by calopolymerization with butylene oxide, followed by ester exchange reaction of polyalkylene oxide obtained by addition polymerization of ethylene oxide with octadecane 1,18 methyl dicarboxylate To obtain rosin A having a weight average molecular weight of 150,000. The melting point and melting energy of this resin A were measured. The melting point was 55 ° C and the melting energy was 120 j / g. Hot melamine A The resin constituting the adhesive layers 20a and 20b was used. PETG (manufactured by Eastman, PETG6763) was used as the resin constituting the thermoplastic resin layer 10, and polyethylene (manufactured by Nippon Polyethylene, LC600A) was used as the resin constituting the protective layers 30a and 30b. Using five extruders, in the layer structure of polyethylene 30aZ resin A20aZPETG10Z resin A20bZ polyethylene 30b, these resins were melt coextruded to form a hot melt adhesive sheet 200 using a multi-hold die. Produced.

[0063] (Example 2)

A hot-melt adhesive sheet 200 was produced in the same manner as in Example 1 except that EVA-based resin “Hirodyne 7524” (manufactured by Hirodine) was used instead of resin A.

[0064] (Example 3)

A hot melt adhesive sheet 200 was produced in the same manner as in Example 1 except that EEA-based resin “HPRAS201” (manufactured by Mitsui DuPont Polychemical Co., Ltd.) was used instead of resin A.

[Example 4]

A hot melt adhesive sheet 200 was prepared in the same manner as in Example 1 except that polyester resin “Polyester SP-170” (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was used instead of resin A.

[0066] (Comparative Example 1)

A hot-melt adhesive sheet 100 was produced in the same manner as in Example 1, except that the polyethylene layer was not formed in Example 1.

[0067] (Comparative Example 2)

One side of the release paper was coated with a tack-based hot melt adhesive (Hirodyne 35S: made by Hirodine) mainly composed of synthetic rubber. In addition, by laminating an EVA-based hot melt adhesive on one side of bleached kraft paper weighing lOOgZm ^2. A release paper was laminated on the other side of the kraft paper with a tack-based hot melt adhesive. Thereafter, the EVA hot melt adhesive side was hand-stretched with a 7 mm thick polystyrene extruded plate-like foam so that the temperature of the hot melt adhesive was 100 ° C.

[0068] (Comparative Example 3)

A 7 mm thick polystyrene extruded plate foam was applied with adhesive and laminated with release paper. (Mirapane: Stock Board iJSP) was used.

[0069] (Reference Example 1)

As the resin constituting the hot melt adhesive layers 20a and 20b, 100 parts by mass of polyethylene glycol (molecular weight 500) was added to 100 parts by mass of the same resin A as in Example 1 above. A hot melt adhesive sheet 200 was obtained in the same manner as in Example 1 except that the fat mixture was used. The melting point of the resin mixture was 30 ° C.

[0070] (Reference Example 2)

An EVA hot melt adhesive sheet (EVA resin single layer, melting point 65 ° C., product name Fusion 400 00) was used as a single layer hot melt adhesive sheet.

[0071] <Evaluation method (1)>

The hot melt adhesive sheet prepared above was evaluated according to the following method.

(Blocking test)

The samples prepared in Examples 1 to 4 and Comparative Examples 1 to 3 were cut into 10 cm squares, and 5 sheets were stacked and allowed to stand at 80 ° C. for 24 hours under a load of 500 g to confirm the presence or absence of blocking. In Examples 1 to 4 and Comparative Examples 2 to 3, they were not blocked. On the other hand, in Comparative Example 1, it was blocked and could not be peeled off.

[0072] (Lamination of printed matter on foam board)

For the hot-melt adhesive sheets 200 of Examples 1 to 4, after peeling off the protective layers 30a and 30b, and with the hot-melt adhesive sheet of Comparative Example 1 as it is, a 900 mm × 1200 mm poster (weighing 128 gZm ² , offset) And a 7 mm thick polystyrene extruded plate foam (Miraboard S: manufactured by iJSP Co., Ltd.) and a thermal laminating machine (Lamimonkey: manufactured by Lamy Corporation) Lamination was performed at a roll temperature of 100 ° C and 5 mm / second. Ten display materials were produced by the same operation. For Comparative Example 2, the release paper was peeled off, and the above posters were stacked and laminated under the same conditions. For Comparative Example 3, remove the release paper, and then paste the above poster by hand.

For Examples 1 to 4 and Comparative Examples 1 and 2, all 10 sheets were able to be laminated without any problem. In Comparative Example 3, 5 out of 10 sheets contained air and air.

[0073] (Lamination of printed matter on magnet sheet)

For the hot melt adhesive sheets 200 of Examples 1 to 4, after the protective layers 30a and 30b were peeled off, the hot melt adhesive sheet of Comparative Example 1 was left as it was, and a 900 mm × 1200 mm poster (weighed 128 gZm ² , Sandwiched between the same size of magnet force lar sheet D (made by Chiray Magnet Co., Ltd.) and a heat laminating machine (Lamimonkey: made by Lamy Corporation) at a roll temperature of 100 ° C and 5 mmZ sec. Laminated. In the production method of the present invention, it was possible to cope with various supports in this way. On the other hand, in Comparative Examples 2 and 3, since the support that had already been bonded was used, it was difficult to handle various supports.

[0074] <Evaluation method (2)>

The hot melt adhesive sheets prepared in Example 1, Reference Example 1 and Reference Example 2 were evaluated by the following methods.

[0075] (Lamination test)

Using a printed paper 60 with a thickness of 500 μm and a support 50 with a 5 mm thick foam board (KP panel: manufactured by JSP), the hot melt adhesive sheet prepared above is sandwiched between them. Then, heat lamination was performed using a heat laminating machine (Lami Monkey: manufactured by Lamy Corporation). In the embodiment having the protective layers 30a and 30b, lamination was performed after peeling them off. In addition, the conditions for thermal lamination are described in the evaluation results.

[0076] The results of the laminate test are shown in Table 1.

[0077] [Table 1]

(table 1 )

(Example 1)

The hot melt adhesive sheet 100 of the present invention could be sandwiched between the paper and the foam board without any problem, and the handleability was good. In addition, it can be laminated without any problems by laminating at a roll temperature of 70 ° C and a roll speed of 7 mm / sec, has a smooth surface, and has no discoloration of printing. Display 300 was obtained.

[0079] (Reference Example 1)

When a hot melt adhesive sheet was sandwiched between paper and foam board, the hot melt adhesive sheet sticked to the foam board, making it difficult to work. Lamination was possible without problems by laminating at a roll temperature of 50 ° C and a roll speed of 7 mmZsec.

[0080] (Reference Example 2)

Although a single-layer hot-melt adhesive sheet could be sandwiched between paper and foam board, the hot-melt adhesive sheet was not stiff, which necessitated a process to stretch the sheet, resulting in poor workability. . Lamination was possible at a roll temperature of 160 ° C and a roll speed of 7 mmZsec, but the foamed board was deformed and the paper was discolored.

In addition, the brand name mentioned in the above description is a trademark or registered trademark of each company.

[0081] While the present invention has been described above in relation to the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. The scope of the claims and the overall specification of the invention are not limited to those described above, and can be appropriately changed without departing from the gist or philosophy of the readable invention. Manufacture of hot melt adhesive sheets, display materials, and laminates with such changes Methods and display manufacturing methods are also to be understood as being within the scope of the present invention. Industrial applicability

[0082] The hot-melt adhesive sheet 100 of the present invention is used for manufacturing a display material to be displayed in a commercial area or an exhibition hall.

Claims

Claims [1] A multi-layer sheet comprising a thermoplastic resin layer as an intermediate layer and a hot-melt adhesive layer laminated on both sides thereof, wherein each layer is formed by batch extrusion Adhesive sheet. [2] The hot melt adhesive sheet according to claim 1, wherein the hot melt adhesive layer is a layer mainly composed of a resin represented by the following general formula (1). [Chemical 1] • A'X'A'R1- (1)

[Chemical 2]

[3] A resin that is selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polystyrene, acrylic resin, polylactic acid, polybutyl chloride, and polycarbonate. 3. The hot melt adhesive sheet according to claim 1 or 2, wherein the hot melt adhesive sheet is a mixture of two or more kinds of resins selected from the group.

[4] The hot melt adhesive sheet is placed in a state of being sandwiched between the first adherend and the second adherend, and is subjected to thermocompression bonding so that the first adherend and the second adherend are placed. 4. The hot melt adhesive sheet according to claim 1, which is used for adhering an adhesive to the adhesive through the hot melt adhesive sheet.

[5] The hot-melt adhesive sheet is disposed between the printed material and the support, and is used for bonding the printed material and the support through the hot-melt adhesive sheet by thermocompression bonding. Claim 1. The hot melt adhesive sheet according to claim 1, wherein the force is the first term

[6] A protective layer is laminated on at least one surface of the hot melt adhesive layer in the hot melt adhesive sheet, and the protective layer is a layer mainly composed of polyolefin resin, The hot melt adhesive sheet according to any one of claims 1 to 5, wherein each layer including the protective layer is formed by coextrusion.

[7] The printed matter, the support, and the hot melt adhesive sheet according to claim 1 sandwiched between the printed matter and the support, and the printed matter and the support. A display material, which is formed by being bonded to a holder via the hot melt adhesive sheet.

[8] A method of manufacturing a laminate by bonding a first adherend and a second adherend, comprising a thermoplastic resin layer as an intermediate layer, and a hot melt adhesive laminated on both sides A step of peeling off the protective layer in a hot melt adhesive sheet comprising a layer and a protective layer laminated on at least one surface of the hot melt adhesive layer;

Laminating the hot melt adhesive sheet from which the protective layer has been peeled, sandwiched between the first adherend and the second adherend,

Bonding the first adherend and the second adherend via the hot melt adhesive sheet by thermocompression bonding;

The manufacturing method of the laminated body provided with.

[9] The method for producing a laminate according to claim 8, wherein the thermocompression bonding is performed by heating the hot melt adhesive sheet to 60 ° C to 120 ° C.

[10] The hot melt adhesive layer is composed mainly of a resin represented by the following general formula (1)! The method for producing a laminate according to claim 8 or 9, wherein the laminate is a layer.

[Chemical 3]

[Chemical 4]

In the general formula (2), Z is a hydrocarbon group having 1 or more carbon atoms, a, b and c are each an integer of 1 or more, and a mass ratio calculated from a, b and c, (44 (a + c) Z (molecular weight of at-oleinoxide having 3 or more carbon atoms) X b} is 80Z20 to 94Z6. The first article to be adhered is a printed material, the second article to be adhered is a support, and the laminate to be manufactured is a display material. The manufacturing method of the laminated body as described in (1).