JP3056316B2 - Laminating sheet and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminating sheet provided with a primer layer and a release layer on one side of a base sheet, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, automobiles such as bumpers and spoilers
For example, when coating on the surface of a molded article having poor adhesion with paint, such as a vehicle body such as a motorcycle, a housing of OA equipment or a home appliance, a sanitary product, an aluminum sash, etc.
A method of applying a paint after providing a primer layer on the surface of a molded article or performing corona discharge treatment has been adopted.

[0003] However, for example, when a primer layer is provided on the surface of a molded article made of polypropylene (PP), it is necessary to wash once with trichloroethylene or the like. It takes time and productivity is low. In addition, there is a problem in that the corona discharge is applied to the surface of a molded article having a large volume, which requires a large-scale apparatus and low productivity.

In the case where a primer layer is provided on the surface or the surface of a molded article which has been subjected to corona discharge treatment is coated, a protection tape may be applied to the part to leave a part which is not desired to be coated. Then, after coating, it is necessary to take measures such as peeling off the protection tape, and there is a problem that the number of steps is increased and the process is complicated.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, in which a part of the surface of an adherend having poor adhesion to a paint is coated, and the remaining part is coated. It is an object of the present invention to provide a laminating sheet to be used by coating and laminating on the surface of an adherend so as to leave it without leaving it, and a method for producing the same.

[0006]

Means for Solving the Problems The invention of claim 1 of the present application is
A laminating sheet provided so that a primer layer is exposed on a part of one side of at least a base sheet that can be spread under heating, and a release layer is exposed on the remaining part of the one side. It is.

[0007] The invention according to claim 2 of the present application is to laminate a release layer having a slight adhesive layer on at least a part of one side of a base sheet that can be spread under heating so that the slight adhesive layer is in contact with the release layer. The method according to claim 1, wherein the laminating sheet is laminated so that the primer layer is exposed on the remaining portion where the release layer on one side is laminated.

[0008] The invention according to claim 3 of the present application relates to a base sheet which can be spread at least under heating so that a primer layer is exposed on a part of one side thereof, and then the primer layer on one side is laminated. 2. The method for producing a laminating sheet according to claim 1, wherein a release layer having a slightly adhesive layer is laminated on the portion of the sheet so that the slightly adhesive layer is in contact with the release layer.

In the present invention, the base sheet having at least extensibility under heating is made of the same material as the molding resin or a material having excellent compatibility in order to obtain adhesion to the molding resin of the adherend. Is preferred. Further, since the base sheet is usually stretched and attached to an adherend, the base sheet is formed of a sheet having ductility at least under heating. When the adhesion between the base sheet and the molding resin of the adherend is poor, a primer layer may be provided between the two.

In the present invention, the resin used for the base sheet having ductility at least under heating includes, for example, polypropylene, polyethylene, polyvinyl chloride, and the like.
Examples include polystyrene, acrylic polymers, polycarbonate, acrylonitrile-butadiene-styrene copolymer (ABS), and thermoplastic elastomers (polyolefin-based, polyurethane-based, etc.).

In the present invention, as the primer for forming the primer layer, those having excellent adhesion to a paint or the like applied to a substrate sheet and a molded article are used.
EVA type, elastomer type (styrene butanediene)
Hot-melt type such as styrene copolymer type, styrene-isoprene-styrene type, polyamide type, polyester type and the like are used. These primers
It is appropriately selected according to the type of the base sheet, the paint and the like to be used.

When the base sheet is polypropylene,
As a primer, chlorinated polypropylene is generally used. As the chlorinated polypropylene, an ordinary commercially available one can be used, and an acid-modified one is particularly preferably used. In addition, to further improve the adhesion with paints, etc.,
Add a small amount (less than 20% by weight) of the same resin as the resin used as a paint binder to the primer,
It is more preferable to use a resin in which a material similar to the resin used as the binder of the coating material is grafted in the primer.

In the present invention, the release layer having slight tackiness is preferably formed by laminating a laminate film made of a thermoplastic resin or rubber which can be spread at least under heating.

As the thermoplastic resin, for example, soft polyvinyl chloride, polyurethane, acrylic resin, polyester, ethylene-vinyl acetate copolymer, polyethylene,
Examples include polypropylene and polyethylene terephthalate.

Examples of the rubber include natural rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, isoprene rubber, butadiene rubber, chloroprene rubber, urethane rubber, silicone rubber, and acrylic rubber.

A film made of a mixture of these thermoplastic resins and rubbers can also be used. When the laminate film has poor adhesiveness to the base sheet and peels off at the time of winding or the like, a slightly tacky adhesive is appropriately laminated on the back surface of the laminate film.

The release layer may be provided by applying a material having slight adhesiveness to the base sheet instead of the laminate film. Also in this case, it is preferable that the release layer provided by application can be spread at least when heated.

In the present invention, the primer layer and the release layer are preferably provided with the same surface. If the difference between the primer layer and the release layer is large, it becomes difficult to wind up the lamination sheet uniformly.

As a method for providing the primer layer on the base sheet, a usual method such as a casting method or a laminating method is employed. For example, when using the casting method,
For example, a primer sufficiently dissolved or dispersed in an organic solvent is coated on a substrate using a coating device for low viscosity such as gravure coat, kiss coat, or three-roll coat, and then dried for solvent removal. It is produced by Alternatively, it is coated on a substrate with a hot melt coater.

In the case of using a laminating method, for example, a primer is applied on a PET film by casting and dried to form a laminate on a substrate. The thickness of the thus obtained base sheet having the primer layer provided on the surface thereof is preferably 100 to 1000 μm when the base sheet is attached to the surface of a molded article having irregularities. When affixing to the surface of a flat molded product, 50
~ 500 µm is preferred.

The thickness of the primer layer is preferably 1 to 30 μm. As a method for providing a release layer on the base sheet, a normal method similar to the above, such as a laminating method when a laminate film is used, a casting method when a coating material is used, and the like are employed.

The molded article to which the laminated sheet of the present invention is applied includes thermoplastic resin, unsaturated polyester resin, acrylic resin, epoxy resin, or a filler such as glass fiber to these resins for the base sheet. Additions and the like, and those made of steel plate, aluminum, wood, ceramics and the like can be mentioned.

A protective sheet is laminated on the laminating sheet provided so that the primer is partially exposed, if necessary. This protective sheet is used for forming a sheet for lamination.
It is used to protect the primer layer after molding, and is peeled off when the molded article is painted.

When a paint is applied to a molded article, the primer layer is exposed on the portion where the paint is desired to be applied, and the release layer is exposed on the portion not desired to be applied. Then, the paint is applied while the release layer is laminated. Then, at the time of completion of the coating, the release layer having slight adhesiveness is peeled off to obtain a coated molded article provided with a coated portion and a non-coated portion.

In the present invention, as a method for coating and laminating a laminating sheet on the outer surface of a molded article, for example, a mold used in an injection molding method, a stamping molding method, a sheet mold compound (SMC) press molding method, or the like can be used. Inserting a sheet for lamination and supplying resin and preforming, or completely divide the space with the adherend into two with the base sheet, evacuate each two layers, and convert the adherend to the laminate sheet It is possible to adopt a double vacuum coating method in which the laminating sheet is coated on the adherend by releasing the pressing vacuum, and a method of simultaneously coating the laminating sheet when manufacturing a molded article continuously, such as extrusion and drawing. it can.

When a laminating sheet is coated and laminated on a long adherend such as an aluminum sash, a commercially available profile laminator or the like can be used. At this time, in order to improve the adhesiveness with the adherend, on the back surface of the sheet for lamination,
It is preferable to provide an adhesive layer or the like. The laminating sheet provided with the pressure-sensitive adhesive layer on the back surface can be usually coated and laminated on the surface of the molded product directly by hand or using a double vacuum molding machine or the like.

According to the present invention, the molded article produced is used for applications such as vehicle bodies such as automobiles and motorcycles such as bumpers and spoilers, housings such as OA equipment and home appliances, sanitary products, and aluminum sashes. .

[0028]

The laminating sheet according to the first aspect of the present invention is provided so that the release layer is exposed on at least a part of one surface of the base sheet which can be spread under heating, so that the surface of the molded article is provided. By coating and laminating on the surface, it is possible to provide a sheet for coating and lamination in which a part of the surface is coated and the remaining part is not coated.

[0029] In the method for producing a laminating sheet according to the second aspect of the present invention, the release layer having a slightly adhesive layer on at least a part of one surface of the base sheet which can be spread under heating is so arranged that the slightly adhesive layer abuts. Then, by laminating so that the primer layer is exposed on the remaining portion where the release layer on one side is laminated, on the base sheet, the release layers having different properties and different lamination means are respectively provided. And a primer layer, so that the sheet of claim 1 can be manufactured. Also, when using a material such as a laminate sheet that hardly fluctuates in width as a material for forming the release layer, by providing the release layer on a part of one surface of the base material sheet first, a primer provided on the remaining part of the one surface It is easy to regulate the width of the layer.

[0030] The method for producing a sheet for lamination according to the third aspect of the present invention comprises laminating a primer sheet on at least a portion of one side of a base sheet that can be spread under heating, and then, forming a primer layer on one side of the base sheet. By laminating a release layer having a slight adhesion layer on the remaining portion where the primer layer is laminated so that the slight adhesion layer is in contact with the release layer, the release layers having different properties and different lamination means are respectively formed on the base sheet. And a primer layer, so that the sheet of claim 1 can be manufactured. When a material which is easily thermally deformed is used as the release layer, a primer is applied to a part of one surface of the base sheet, dried through a drying zone to laminate the primer layer, and then peeled to the remaining part of the one surface. By providing the layer, thermal deformation of the release layer can be prevented.

[0031]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. First, the lamination sheet of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes a laminating sheet according to an embodiment of the present invention. The laminated sheet 1
A primer layer 12 is provided on at least one half of a base sheet 11 made of a thermoplastic resin, which can be spread under heating, so that a primer layer 12 is exposed. The release layer 13 provided with the layer 132 is provided so that the back surface side on which the pressure-sensitive adhesive layer 132 is provided faces the base material sheet 11 and the front surface side is exposed.

The exposed state of the primer layer and the release layer is not limited to the above example, but may be provided so that each part is exposed. When performing coating or the like, an arrangement can be appropriately selected such that a primer layer is provided on a portion where coating is desired and a release layer is provided on a portion where coating is not desired.

Next, an example of a method for manufacturing a laminating sheet according to the second aspect of the present invention will be described with reference to FIGS. The above-mentioned base material sheet 11 is continuously fed out from the feeding device 21. Further, the laminate film 131 having the pressure-sensitive adhesive layer 132 laminated on the back surface is continuously fed from the feeding device 22. A laminate film 131 is overlaid on one half of the base sheet 11 along the longitudinal direction with the pressure-sensitive adhesive layer 132 facing, and the laminate film 23 is laminated under high pressure while heating with a laminating roll 23, and the release layer 13 is stretched in the longitudinal direction. A partially laminated sheet provided so as to be exposed along is created.

The partially laminated sheet is guided between the turn rolls 24 to the coating device 25, and the remaining half of the base sheet 11 provided with the release layer 13 is exposed to the other half.
Along the longitudinal direction, the primer 121 is applied so as to be in contact with the kiss roll 251, passed through the drying zone 26 and taken up by the take-up device 27, and as shown in FIG. The production of is ended.

Next, an example of a method for manufacturing a laminating sheet according to the third aspect of the present invention will be described with reference to FIGS. The above-mentioned base material sheet 11 is continuously fed out from the feeding device 31. The base sheet 11 is guided to the gravure coating apparatus 32 and the primer 121 is continuously applied to one half of one side of the base sheet 11 along the longitudinal direction so as to pass through the kiss roll 321 and the backup roller 322. 33, and is dried to form a partially laminated sheet provided so that the primer layer 12 is exposed.

A laminate film 131 provided with an adhesive layer 132 on the back surface is continuously fed from a feeding device 34 to the remaining half of the partially laminated sheet provided so that the primer layer 12 is exposed. , Substrate sheet 1
1 and the pressure-sensitive adhesive layer 132 is turned on, and laminated by pressing strongly under heating with a laminating roll 35.
To complete the production of the laminating sheet 1 as shown in FIG.

The laminating sheet 1 is placed in an injection mold (not shown) with the surface on which the primer layer 12 and the release layer 11 are provided in close contact with the mold surface. By injection-molding the molten molding resin for molding into a mold, a coated laminated product covered with the laminating sheet 1 is obtained.

Then, the base material sheet 11 is coated on the molded article main body 41 as shown in FIG. A coating film 42 is provided on the primer layer 12 thus applied, and a coated molded article 4 in which the coating is not applied to the portion from which the release layer 13 has been removed is obtained.

In the following examples, the base sheet 11,
As the primer layer 12, the release layer 13, and the paint, two levels were appropriately combined as follows.

1. Base material sheet (1) Polypropylene (PP) sheet having a thickness of 500 μm formed by calendering (2) PP having a thickness of 300 μm formed by calendering
-Based thermoplastic elastomer sheet

[0042] 2. Primer layer Primer (manufactured by Sanyo Kokusaku Pulp Co., Ltd .: trade name “Supercron 822” chlorinated polypropylene) is applied so that the thickness after drying becomes 10 μm, and dried at 80 ° C. for 15 minutes. 100 parts by weight of epoxy resin (manufactured by Yuka Shell Epoxy Co., Ltd .: trade name “Epicoat 828”)
Apply 5 parts by weight so that the thickness after drying is 10 μm, and dry at 80 ° C. for 15 minutes

[0043] 3. Release layer 13 (a) 5 μm of an acrylic pressure-sensitive adhesive was applied to the back surface of a polyethylene terephthalate (PET) film (10 μm thick ).
(b) A slightly adhesive film in which an acrylic adhesive is laminated in a thickness of 5 μm on the back surface of the PP film (thickness: 10 μm)

4. Paint I. Quick-drying acrylic urethane paint (Dai Nippon Paint Co., Ltd .: trade name "Auto Magnum") II. Soft touch paint (Cashew Co., Ltd .: trade name "Senosoft II")

Example 1 A. Preparation of Base Sheet Using (1) as the base sheet 11, using the primer layer, and using (a) as the release layer, the laminating sheet 1 as shown in FIG. 1 was formed by the forming method as shown in FIG. I got

B. Production of Coated Laminated Product First, the primer layer / release layer side was brought into close contact with the mold surface of the mold by using both the vacuum forming method and the pressure forming method for the base sheet 1 described above. Next, injection molding was performed at a temperature of 230 ° C. at the tip of the nozzle of the injection molding machine using polypropylene (trade name “BC3” manufactured by Mitsubishi Yuka Co., Ltd.) as a resin for molding the main body.
A coated laminate having a substantially U-shaped cross section in which the primer layer 12 and the release layer 13 on the surface were partially exposed was manufactured.

C. Coating adhesion test On the primer layer 12 of the coating of the above-mentioned coated laminate, using I as a coating, the coating was dried to a thickness of 40 μm.
m and dried, and then the release layer 13 was peeled off and the surface of the primer layer 12 was painted.
As a result, a coated molded product 4 was obtained as shown in FIG.

Using a cutter knife, a straight line reaching the base of the coated molded article (substrate made of thermosetting resin) was formed on the coated surface of the coated molded article 4 obtained as described above at an interval of 2 mm. Then, eleven straight lines were drawn parallel to each other, and then eleven straight lines orthogonal to the straight lines were drawn in the same manner to form a grid-like portion. Further, an adhesive tape (manufactured by Sekisui Chemical Co., Ltd., trade name: Sekisui Tape) was adhered to the cross-cut portion, and the remaining number of cross-cut cells was examined by peeling off the adhesive tape (hereinafter referred to as a cross-cut adhesion test. Name). as a result,
The ratio of the mass where the coating layer remained was 100/100.
Was individual. That is, in the cross-cut adhesion test, peeling of the coating layer was not recognized.

Table 1 shows the conditions and results. Example 2 (2) was used as the base material 11, (b) was used as the release layer 13, and II was used as the paint, and the paint was applied so that the thickness after drying was 30 μm. Except that it was dried in the same manner as in Example 1,
I got

The coating molded article 4 was subjected to a coating film adhesion test. As a result, the ratio of the mass where the coating layer remained was 100/100. That is, in the cross-cut adhesion test, peeling of the coating layer was not recognized.

Table 1 shows the conditions and results. Example 3 Lamination sheet 1 using primer 12
Was manufactured in the same manner as in Example 1 except that was manufactured by the manufacturing method shown in FIG.

The coated molded article 4 was subjected to a coating film adhesion test. As a result, the ratio of the mass where the coating layer remained was 100/100. That is, in the cross-cut adhesion test, peeling of the coating layer was not recognized.

Table 1 shows the conditions and results. Example 4 (2) was used as the base sheet 11, the primer layer 12 was used, b was used as the release layer 13, and the thickness after drying was 30 using II as the paint.
μm and dried, and the lamination sheet 1 was manufactured by the manufacturing method shown in FIG.
A coated molded product 4 was obtained in the same manner as in Example 1.

The coated molded article 4 was subjected to a coating film adhesion test. As a result, the ratio of the mass where the coating layer remained was 100/100. That is, in the cross-cut adhesion test, peeling of the coating layer was not recognized.

Table 1 shows the conditions and results. Comparative Example 1 A coated molded article was obtained in the same manner as in Example 1, except that the base sheet (1) without the primer layer 12 and the release layer 13 was used.

The coated molded article was subjected to a coating film adhesion test. As a result, the ratio of the mass where the coating layer remained was 0/100. That is, in the cross-cut adhesion test, the entire coating layer was peeled off.

Table 1 shows the conditions and results. Comparative Example 2 Except that the base sheet (2) without the primer layer 12 and the release layer 13 was used, and that II was used as a coating material to apply the coating so that the thickness after drying was 40 μm, and the coating was dried. In the same manner as in Example 1, a coated molded product was obtained.

The coated molded article was subjected to a coating film adhesion test. As a result, the ratio of the mass where the coating layer remained was 0/100. That is, in the cross-cut adhesion test, the entire coating layer was peeled off.

Table 1 shows the conditions and results.

[0060]

[Table 1]

[0061]

The laminate sheet according to the first aspect of the present invention has the above-described structure. By coating and laminating on the surface of a molded article, a part of the surface is coated and the other part is coated. Can be provided as a sheet for lamination that can be easily applied with no coating or the like.

Since the method for producing a sheet for lamination according to the second aspect of the present invention is configured as described above, a release layer and a primer layer having different properties and different lamination means are provided on the base sheet. Can be manufactured to produce the sheet of claim 1. In addition, when a material such as a laminate sheet, which hardly fluctuates in width, is used as a material for forming the release layer, it is easy to regulate the width of a primer layer provided later. Since the method for producing a sheet for lamination according to the third aspect of the present invention is configured as described above, a release layer and a primer layer having different properties and different lamination means are respectively exposed on the base sheet. So that
The sheet of claim 1 can be manufactured. When a material which is easily thermally deformed is used as the peeling layer, the thermal deformation of the peeling layer can be prevented by providing the peeling layer later.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a laminating sheet of the present invention.

FIG. 2 is a front view illustrating an example of a method for manufacturing a laminating sheet of the present invention.

FIG. 3 is a front view illustrating another example of the method for manufacturing a sheet for lamination of the present invention.

FIG. 4 is a longitudinal perspective view showing an example of a painted molded product manufactured using the lamination sheet obtained according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamination sheet 4 Painted article 11 Base sheet 12 Primer layer 13 Release layer 21, 22, 31, 34 Feeding device 23, 35 Laminating roll 25 Coating device 26, 33 Drying zone 27, 36 Winding device 32 Gravure coating device 41 Molded product body 42 Painting

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 B05B 1/00-17/08 B05D 1/00-7/26

Claims (3)

(57) [Claims] 1. A base sheet which can be spread at least under heating so that a primer layer is exposed on a part of one surface and a release layer is provided on a remaining part of the one surface. A sheet for lamination, characterized in that: 2. A release layer having a slightly adhesive layer is laminated on at least a part of one surface of a substrate sheet that can be spread under heating so that the slightly adhesive layer is in contact with the release sheet. 2. The method for producing a sheet for lamination according to claim 1, wherein the layer is laminated so as to expose the primer layer on the remaining portion. 3. A base sheet which can be spread at least under heating, so that a primer layer is exposed on a part of one side thereof, and then the remaining part where the primer layer is laminated on one side is slightly adhered. The method for producing a sheet for lamination according to claim 1, wherein the release layer having the layer is laminated so that the slightly adhesive layer is in contact with the release layer.