JP3476541B2 - Transfer sheet for membrane press molding - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin sheet or a synthetic resin plate to be subjected to a membrane press molding such as a vacuum press molding or a pressure press molding before a membrane press molding. It is possible to transfer a desired function to the surface of a synthetic resin sheet or a synthetic resin plate, and further form the synthetic resin sheet or the synthetic resin plate by a membrane press molding method without removing the base film even after the transfer. Invention relating to a transfer sheet for membrane press molding,
In particular, the present invention relates to a transfer sheet for membrane press molding capable of imparting functions such as stain resistance, scratch resistance, and high gloss to the surface of a synthetic resin sheet or a synthetic resin plate. 2. Description of the Related Art A so-called membrane press forming method, which is a pressing method such as vacuum press forming or compressed air press forming,
Basically, it is as follows. That is, first, a synthetic resin sheet or a synthetic resin plate (hereinafter, simply referred to as a synthetic resin sheet, but always includes a synthetic resin plate) is heated to near its softening point, and is heated to an object having a predetermined shape (for example, a kitchen set). A wooden body in the shape of a door.), And an elastic membrane (for example, a rubber film) is further placed on this. Then, the surface of the subject is evenly covered with the synthetic resin sheet by applying the pressure of air or liquid to this. Then, a synthetic resin sheet deformed according to the shape of the subject (in this case, the shape of the door) is obtained. In the membrane press forming method performed in such a method, for example, when it is desired to impart functions such as stain resistance, scratch resistance, and high gloss to the surface of the synthetic resin sheet, these functions are used as a pretreatment for performing the membrane press forming. After applying (coating) a functional paint that can impart
Alternatively, after these functions are previously imparted to the surface of the synthetic resin sheet by a transfer method using a transfer sheet, the synthetic resin sheet is subjected to membrane press molding according to the above procedure (see, for example, JP-A-4-241943). .). By doing so, the surface of the obtained (deformed) synthetic resin sheet has functions such as stain resistance, scratch resistance, and high gloss. [0003] However, when a functional paint is preliminarily coated, a pattern such as a streak generated at the time of coating is generated. This method is not suitable when a close finish is required. In addition, when a UV paint that imparts UV aging resistance is used among functional paints, the UV paint often lacks elongation. Therefore, when membrane press molding is performed using a synthetic resin sheet coated with the UV paint, cracking occurs in the UV paint. Occurs. Furthermore, when performing a membrane press molding of a synthetic resin sheet having a function imparted to the surface using a transfer sheet, first transfer the function to the synthetic resin sheet surface using the transfer sheet, and then transfer the base film of the transfer sheet after the transfer. The membrane may be peeled, but if the membrane press molding is performed while the membrane is being peeled, the transferred function may be impaired.Therefore, a protective film for protecting the transferred function during membrane press molding is used for the transferred synthetic resin. It was necessary to perform membrane press molding after newly attaching to the sheet surface. That is, if the conventional transfer sheet is used, if the base film is left peeled, the base film is melted and the transferred function is impaired, so the base film must be peeled off, Unless a protective film different from the base film is affixed to protect the transferred functions, membrane press molding cannot be performed, which increases the number of steps, takes time, and requires extra cost, which is a problem. Was. The present invention has been made in view of the above problems, and an object of the present invention is to provide a transfer film for membrane press molding used when a synthetic resin sheet having a surface provided with a function using a transfer sheet is subjected to membrane press molding. Another object of the present invention is to provide a transfer sheet for membrane press molding that enables continuous membrane press molding without peeling the base film even after transfer to the surface of the synthetic resin sheet. [0005] The present invention relates to claim 1 of the present invention.
Transfer sheet for membrane press molding
When performing molding without
Membrane for synthetic resin sheet or synthetic resin sheet
Before performing the operation, set the desired function to the synthetic resin sheet in advance.
Or used to apply by transferring to synthetic resin plate surface
The transfer sheet for membrane press molding
Base film for transfer sheet for membrane press molding
As a biaxially stretched polycarbonate having a thickness of 12 μm to 100 μm.
Fin film and biaxially rolled 3.5 to 25 μm thick
Stretched polyester film and laminated film
Using the biaxially stretched polyester in the base film
A heat-resistant release layer is provided on
On it, directly or through a release layer, a protective layer, and has an adhesive layer, were sequentially formed configuration, the heat Lili
Base layer is epoxy-melamine resin, acrylic-melamine
Resin, melamine resin, urea resin, urea-melamine tree
Heat-resistant release made of either grease or silicone resin
Rolling agent, gravure coating
The biaxially stretched polyester film by
Apply to the side and then dry or cure it
The thickness will be between 0.1 μm and 3.0 μm
Transfer membrane for membrane press molding.
Using a sheet on the surface of the synthetic resin sheet or synthetic resin plate
Even after transferring the desired function by transfer,
Peel off the base film of the transfer sheet for lens press molding
Continue to perform membrane press molding without
That is characterized by The transfer sheet for membrane press molding according to the present invention has a thickness of 12 μm to 100 μm as a base film.
m biaxially stretched polyolefin film and thickness 3.5μ
Since a film obtained by laminating a biaxially stretched polyester film having a thickness of from 25 to 25 μm is used, a membrane according to the present invention is used when a synthetic resin sheet having a desired function transferred to the surface thereof by membrane press molding is used. If it is a transfer sheet for press molding, the membrane press is performed without peeling the base film, but even when the synthetic resin sheet partially expands at the time of the membrane press, for example, the curved surface part is extended, the base film is also similar to the elongation (Hereinafter, simply referred to as "(to the base film)"), so that the base film is peeled off and a new protective film is attached as in the past. This has the effect of eliminating the need. Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. The transfer sheet for membrane press molding according to the present invention is as follows. That is, when performing the membrane press molding, before performing the membrane press on the synthetic resin sheet to be subjected to the membrane press, it is used to impart a desired function by transferring the desired function to the surface of the synthetic resin sheet in advance. In the transfer sheet for membrane press molding obtained, as a base film of the transfer sheet for membrane press molding, a biaxially oriented polyolefin film having a thickness of 12 μm to 100 μm and a thickness of 3.5 μm to 2 μm
Using a film obtained by laminating a biaxially oriented polyester film of 5 μm, a protective layer and an adhesive layer are sequentially formed on the biaxially oriented polyester film side of the base film, directly or via a release layer, Even after imparting the desired function to the surface of the synthetic resin sheet by using the transfer sheet for membrane press molding, the membrane press molding is continued without removing the base film of the transfer sheet for membrane press molding. It can be performed. Further, a heat-resistant release layer is provided on the biaxially stretched polyester film side of the base film, and further thereon, directly or via a release layer, a protective layer and an adhesive layer may be sequentially formed. I do not care. Hereinafter, description will be made in order. First, a polyolefin film and a polyester film used as a base film will be described. As the polyolefin film, for example, a low-density polyethylene film, a linear-low-density polyethylene film, a polypropylene film, an ethylene-propylene copolymer film (including other copolymer films) and the like are used. On the other hand, as the polyester film, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene terephthalate / isophthalate copolymer and the like are used. These may be blended with two or more kinds of polymers. For example, when a polyethylene terephthalate / isophthalate copolymer is blended with polyethylene terephthalate, it is preferable. Further, a polyethylene terephthalate / isophthalate copolymer film may be combined with the polyethylene naphthalate film, for example. The polyolefin film and the polyester film used for the base film are biaxially stretched films. In the following description, “biaxial stretching” is omitted for the polyolefin film and the polyester film, but it is refused here that all films are biaxially stretched films. The reason for using a biaxially stretched film is that, as is known to those skilled in the art, this film has excellent thermal stability. The reason that it is preferable because it is excellent in thermal stability is that when the transfer sheet for membrane press molding in this example is actually used, for example, heat treatment is performed many times when performing a transfer step, For example, when an unstretched film is used as the base film, heat shrinkage occurs during the heat treatment, and therefore, there is a very high possibility that transfer will not be performed reliably and neatly. On the other hand, if a biaxially stretched film having excellent thermal stability is used, such as the transfer sheet for forming a membrane press in the present example, the base film does not undergo thermal shrinkage even after the heat treatment performed during transfer. That is, since the base film is not deformed, the transfer can be performed reliably and neatly. There is no particular limitation on the lamination of the polyolefin film and the polyester film, and a usual lamination method can be used. For example, a polyester polyurethane adhesive is applied to a polyester film, dried, and bonded to a polyolefin film. The thickness of the polyolefin film and polyester film used as the base film is as follows:
It is possible to use a polyolefin film having a thickness of 12 μm to 100 μm, preferably 20 μm to 70 μm, and a polyester film having a thickness of 3.5 μm to 25 μm, preferably 9 μm to 16 μm. This is preferable because the followability during processing becomes favorable. In the transfer sheet for forming a membrane press according to the present invention, a heat-resistant release layer may be provided as necessary, as described above. The heat-resistant release layer in the present example is not particularly limited, and can prevent fusion of the base film and the synthetic resin sheet in the generation of oligomers from the base film during membrane press molding, and further does not melt due to heat during molding. Anything can be used. For example, an epoxy-melamine resin, an acrylic-melamine resin, a melamine resin, a urea resin, a urea-melamine resin, a silicone resin, or the like, is coated with a heat-resistant release agent, such as a roll coating method or a gravure coating method, which is generally known. Formed by applying to the polyester film side of the base film by the method and drying (curing in the case of a curable coating film made of thermosetting resin, ultraviolet curable resin, electron beam curable resin, radiation curable resin, etc.) Is done. The thickness of the heat-resistant release layer is usually selected in the range of 0.1 μm to 3 μm, more preferably in the range of 0.3 μm to 1.5 μm. This is because if the thickness is less than 0.1 μm, there is no effect in preventing the generation of oligomers, and if it exceeds 3 μm, the drying speed becomes slow, resulting in inefficient production and poor economic efficiency. . As described above, in the transfer sheet for membrane press molding in the present embodiment, a heat-resistant release layer is provided directly or on a release layer on the biaxially stretched polyester film side of the base film. Through,
Although a protective layer and an adhesive layer are sequentially formed, a release layer can be provided as needed. The release layer will be described. If the release layer has good weather resistance, it can be used without any particular limitation. For example, acrylic resin, silicone resin, silicon resin
A release agent composed of an acrylic resin or the like is applied by a generally known coating method such as a roll coating method or a gravure coating method, and dried (thermosetting resin, ultraviolet curable resin, electron beam curable resin, radiation curable resin) In the case of a curable coating film such as by curing, it is formed by curing. The thickness of the release layer is usually 0.1 μm to
1.5 μm range, more preferably 0.3 μm to 1.0
A range of μm is selected. If the thickness is less than 0.1 μm, there is no mold releasing effect and there is no meaning in molding, and if it exceeds 1.0 μm, the durability of the protective layer is adversely affected. The resin used for the protective layer in this embodiment can be used without any particular limitation as long as it has good weather resistance, solvent resistance, scratch resistance, stain resistance and the like. For example, urethane resin, urethane-acrylic resin,
A coating agent composed of an acrylic resin, a silicone resin, a silicon-acrylic resin, a melamine resin, a urea resin, a urea-melamine resin, or the like is applied by a generally known coating method such as a roll coating method or a gravure coating method, and dried (heat). In the case of a curable coating film made of a curable resin, an ultraviolet curable resin, an electron beam curable resin, a radiation curable resin, or the like, it is formed by curing. The thickness of the protective layer is usually selected from a range of 0.5 μm to 20.0 μm, and more preferably, a range of 1.0 μm to 5.0 μm. If the thickness is less than 1 μm, it is not preferable because the protective layer cannot sufficiently exhibit the resistance, and if it exceeds 20.0 μm, the moldability and the handling of the transfer sheet for membrane press molding are adversely affected. The resin used for the adhesive layer in this embodiment can be used without any particular limitation as long as it has good weather resistance and adhesiveness. For example, it is formed by applying an adhesive made of an acrylic resin, a polyester resin, an epoxy resin, a urethane resin, or the like by a normal coating method such as a roll coating method or a gravure coating method, and then drying. The thickness of the adhesive layer is generally selected from the range of 0.3 μm to 20.0 μm, more preferably from 0.5 μm to 2.0 μm, depending on the surface shape of the adherend. If the thickness is less than 0.3 μm, a strong adhesion to the powerful resin sheet cannot be obtained.
If it exceeds 50, the protective layer will be adversely affected, the drying speed will be slow, the efficiency will be inefficient, and the economic efficiency will be poor.
The transfer sheet for membrane press molding according to the present embodiment described above is used as follows. That is, as described in the prior art, the surface of the synthetic resin sheet to be subjected to membrane press molding, for example, is used for imparting a function such as weather resistance, specifically,
First, a desired function, for example, weather resistance is imparted to the surface of the synthetic resin sheet by transfer using a transfer sheet for membrane press molding by a known method, and then the synthetic resin sheet provided with the desired function on the surface by this transfer The membrane press is performed in a state where the transfer sheet for membrane press molding is adhered to the surface of the above, that is, in a state where the base film of the transfer sheet for membrane press molding is not peeled off. Then, the base film may be peeled from the obtained molded product, or the molded product may be distributed to the final stage while the base film is adhered, and may be peeled when actually used for the first time. Hereinafter, the present invention will be further described with reference to examples. Example 1 A polyethylene film having a thickness of 40.0 μm and a thickness of 9.
On a polyethylene terephthalate film side of a base film (composite film) laminated with a 0 μm polyethylene terephthalate film, a solution composed of 20 parts (parts by weight, the same applies hereinafter) of silicone resin, 45 parts of toluene, and 35 parts of methyl isobutyl ketone was applied. It was applied by a gravure coating method and dried to form a release layer having a thickness of 0.5 μm. Next, an acrylic resin 35 is formed on the release layer.
, A solution consisting of 1 part of silicone resin, 55 parts of methyl ethyl ketone and 10 parts of cyclohexane was applied by a gravure coating method and dried to form a protective layer having a thickness of 2.0 μm. Next, a solution consisting of 10 parts of acrylic resin, 40 parts of toluene and 30 parts of methyl ethyl ketone was applied on the protective layer by a reverse coating method and dried to form an adhesive layer having a thickness of 1.0 μm according to the present invention. A transfer sheet for membrane press molding was obtained. Example 2 A polyethylene film having a thickness of 20.0 μm and a thickness of 1
A 2.0 μm polyethylene terephthalate film,
15 parts of melamine resin, 35 parts of xylene, 50 parts of methyl isobutyl ketone on the polyethylene terephthalate film side of the base film (composite film) laminated with
Part, a solution consisting of gravure coating method,
After drying, a heat-resistant release layer having a thickness of 0.5 μm was formed.
Then, on this heat-resistant release layer, 20 parts of acrylic resin,
50 parts of methyl ethyl ketone, methyl isobutyl ketone 3
0 part of the solution was applied by a gravure coating method and dried to form a release layer having a thickness of 1.0 μm. Next, a solution composed of 35 parts of a urethane resin, 55 parts of methyl ethyl ketone, and 10 parts of cyclohexanone was applied onto the release layer by a gravure coating method, and dried to a thickness of 2.
A protective layer of 0 μm was formed. Next, a solution composed of 10 parts of a polyester resin, 40 parts of toluene, and 30 parts of methyl ethyl ketone was applied to the protective layer by a reverse coating method and dried to form an adhesive layer having a thickness of 1.0 μm according to the present invention. A transfer sheet for forming a membrane press was obtained. Example 3 A polypropylene film having a thickness of 20.0 μm, a polyethylene terephthalate film having a thickness of 9.0 μm,
Urea-melamine resin 20 parts, toluene 50 parts, methyl ethyl ketone 3
0 part of the solution was applied by a gravure coating method and dried to form a heat-resistant release layer having a thickness of 0.7 μm. Next, an acrylic resin 35 is formed on the heat-resistant release layer.
, A solution composed of 30 parts of xylene and 35 parts of methyl isobutyl ketone was applied by a gravure coating method and dried to form a protective layer having a thickness of 1.7 μm. Next, 15 parts of acrylic resin, 5 parts of methyl ethyl ketone
A solution composed of 0 parts and 35 parts of toluene was applied by a gravure coating method and dried to form an adhesive layer having a thickness of 0.5 μm, thereby obtaining a transfer sheet for forming a membrane press according to the present invention. Example 4 A polyethylene film having a thickness of 60.0 μm and a thickness of 6.
A solution consisting of 38 parts of acryl-urethane resin, 35 parts of xylene, and 30 parts of methyl isobutyl ketone is applied to the polyethylene terephthalate film side of a base film (composite film) obtained by laminating a 0 μm polyethylene terephthalate film with a gravure coating method. And dried to form a protective layer having a thickness of 2.0 μm. Then, on this protective layer, 20 parts of an acrylic resin, 70 parts of methyl ethyl ketone, and 10 parts of cyclohexanone were applied by a reverse coating method and dried to form an adhesive layer having a thickness of 1.0 μm. A transfer sheet for forming was obtained. Comparative Example 1 A solution composed of 20 parts of a silicone resin, 45 parts of toluene, and 35 parts of methyl isobutyl ketone was applied on a 25 μm-thick polyethylene terephthalate film (base film) surface by a gravure coating method and dried. Then, a release layer having a thickness of 0.5 μm was formed. Next, a solution composed of 35 parts of an acrylic resin, 1 part of a silicon resin, 55 parts of methyl ethyl ketone, and 10 parts of cyclohexanone is applied on the release layer by a gravure coating method and dried to form a protective layer having a thickness of 2.0 μm. did. Next, a solution composed of 10 parts of an acrylic resin, 40 parts of toluene, and 30 parts of methyl ethyl ketone was applied on the protective layer by a reverse coating method and dried to form an adhesive layer having a thickness of 1.0 μm to obtain a transfer sheet. Was. Comparative Example 2 A solution comprising 15 parts of melamine resin, 35 parts of xylene and 50 parts of methyl isobutyl ketone was applied on a surface of a polyethylene terephthalate film (base film) having a thickness of 12 μm by a gravure coating method and dried. Then, a heat-resistant release layer having a thickness of 0.5 μm was formed. Next, on this heat-resistant release layer, a solution composed of 20 parts of an acrylic resin, 50 parts of methyl ethyl ketone, and 30 parts of methyl isobutyl ketone was applied by a gravure coating method and dried.
A release layer having a thickness of 1.0 μm was formed. Next, on this release layer, 35 parts of urethane resin, 55 methyl ethyl ketone
And a solution consisting of 10 parts of cyclohexanone by a gravure coating method and dried to form a protective layer having a thickness of 2.0 μm. Then, on this protective layer, 10 parts of polyester resin, 40 parts of toluene, 30 parts of methyl ethyl ketone
Part, a solution consisting of a reverse coating method,
After drying, an adhesive layer having a thickness of 1.0 μm was formed to obtain a transfer sheet. The transfer sheets of Examples 1-4 and the transfer sheets of Comparative Examples 1-2 were used for the membrane press-forming of a polyvinyl chloride sheet, and the transfer was carried out. I ran the press. Then, the shape of the polyvinyl chloride sheet on which the membrane press molding was completed, the followability with the shape of the transfer sheet for the membrane press molding or the shape of the transfer sheet, the releasability of the base film after the molding, the appearance, and the stain resistance were evaluated. . Table 1 shows the results.
It was shown to. The evaluation of the followability of the transfer sheet to the molded shape in Table 1 is as follows. ◎: No problem at all ：: There is some problem in the ability to follow deep dents, but it is practical level △: Cannot follow depending on the molding pattern ×: Cannot follow general molding [0025] Base after molding in Table 1 The evaluation of the peelability of the film is as follows. ◎: Peeling can be performed without any problem. ○: Depending on the molding pattern, there may be heavy peeling, but the film can be peeled without breaking. Δ: Depending on the molding pattern, peeling failure occurs at corners and edges. ×: Corner and edge The peeling failure occurs at the portion. The appearance evaluation of the transfer surface after molding in Table 1 is as follows. ◎: Good gloss with no cracks ○: No crack but slightly reduced gloss depending on the molding pattern △: Cracks are generated and gloss is reduced depending on the molding pattern ×: Cracks are generated and gloss is reduced The contamination evaluation of the transfer surface after molding in Table 1 is as follows. ：: Characters written by magic can be erased by IPA ○: Characters written by magic can be erased by IPA and some parts remain faint △: Some characters written by magic cannot be erased by IPA ×: Magic Cannot be erased by IPA (Magic = Magic Ink (registered trademark)) (IPA =
(Isopropyl alcohol) From Table 1, it can be seen that the transfer sheets for forming a membrane press according to the present invention according to Examples 1 to 4 are comparative examples 1 to 2.
It is recognized that the above four points are extremely superior to the transfer sheet of No. The transfer sheet for membrane press molding according to the present invention has a thickness of 12 μm to 1 μm as a base film.
Since a film obtained by laminating a biaxially stretched polyolefin film of 00 μm and a biaxially stretched polyester film of 3.5 μm to 25 μm in thickness is used, it is extremely excellent in membrane press molding. In fields where membrane pressing is performed, such as molded parts for interior and exterior of automobiles, miscellaneous goods, light electrical appliances, furniture furniture, and the like, the industrial effect is extremely high as a method for obtaining a membrane pressed molded article subjected to a surface protection treatment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing a basic configuration of a transfer sheet for membrane press molding of the present invention. FIG. 2 is a schematic sectional view showing the configuration of another embodiment of the transfer sheet for membrane press molding of the present invention. [Description of Signs] 1 Biaxially stretched polyolefin film 2 Biaxially stretched polyester film 3 Release layer 4 Release layer 5 Protective layer 6 Adhesive layer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-216377 (JP, A) JP-A-7-256671 (JP, A) JP-A-4-241943 (JP, A) JP-A-7-206 88948 (JP, A) JP-A-7-132553 (JP, A) JP-A-3-2000 (JP, A) JP-A-6-115295 (JP, A) JP-A-5-21437 (JP, Y2) 4-5358 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41M 3/12 B29C 51/14 B32B 27/32 B44C 1/17

Claims (1)

(57) [Claims] [Claim 1] When performing membrane press molding, before performing a membrane press on a synthetic resin sheet or a synthetic resin plate to be subjected to a membrane press, a desired function is previously determined. Is transferred to the surface of the synthetic resin sheet or the synthetic resin plate by using a transfer sheet for membrane press molding. As a base film of the transfer sheet for membrane press molding, biaxial stretching with a thickness of 12 μm to 100 μm Polyolefin
Film and 3.5 µm to 25 µm thick biaxially stretched polye
A biaxially stretched polyester film in the base film using a film obtained by laminating a stell film and
On the lum side, a heat-resistant release layer is provided, and further thereon, directly or via a release layer, a protective layer and an adhesive layer are sequentially formed, and the heat-resistant release layer has Epoxy-melamine resin, acrylic-melamine resin,
Lamin resin, urea resin, urea-melamine resin, silicon
Resin, heat-resistant release treatment agent consisting of any of the following, roll coating method, or gravure coating method,
Is applied to the biaxially stretched polyester film side
And then drying or curing it,
Is formed to have a thickness of 0.1 μm to 3.0 μm.
Te becomes, even after the application by transferring the desired function to the synthetic resin sheet or synthetic resin sheet surface by using the transfer sheet for a membrane press molding, not peeled off the base film of the transfer sheet for a membrane press molding conditions A transfer sheet for membrane press molding, characterized in that membrane press molding can be performed as it is.