JP2000071402A - Polyester film for transfer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a high-speed transfer to be performed without transfer of a transfer layer to an opposite face, even when an adhesive layer for imparting a high-speed transfer function sticks to a PEs of the opposite face by providing a back face treatment layer consisting of a heat-curable resin and an alkyd resin modified by a saturated fatty acid, on one of the faces of a polyester film. SOLUTION: On one of the faces of a polyester(PEs) film manufactured by polycondensating an aromatic dicarboxylic acid such as terephthalic acid or isophthalic acid or an ester thereof and a glycol such as glycol, a back face treatment layer comprising a heat-curable resin and an alkyd resin modified by a saturated fatty acid is formed. The heat-curable resin to be used for the back face treatment layer is such as a urea resin, melamine resin or benzoguanamine resin. The alkyd resin modified by the saturated fatty acid is obtained by polymerizing an alkyd fat using myristic acid, palmitic acid, stearic acid, behenic acid or the like as the saturated fatty acid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to the production of a transfer polyester film (hereinafter abbreviated as PEs film), but can be applied to other PEs films for release.

[0002]

2. Description of the Related Art A transfer material is constituted by sequentially laminating a release layer, a design layer, an adhesive layer and the like on one side of a substrate PEs film. By imparting antistatic properties, antibacterial properties, and other various functions to these release layers, design layers, adhesive layers, and other layers, design effects and various functions can also be provided.

In recent years, as the design and various functions of a transferred product have been improved, the function of a transfer device has been improved, and applications in various fields other than decoration are being carried out. On the other hand, in order to improve productivity during transfer processing of transfer material,
It is desired to increase the transfer speed of the transfer material. As this means, an adhesive resin having a low glass transition point is used for the adhesive layer on the uppermost layer of the transfer layer laminated on the substrate PEs film, or an adhesive resin having a good affinity for the transferred material is selected and used. By doing so, it is possible to perform transfer at a low transfer temperature and a low transfer pressure, and it is possible to shorten the transfer time. As a result, it was possible to increase the transfer speed, and to improve the poor adhesion to the transfer object, and the quality and yield.

However, a transfer material in which an adhesive having a low glass transition point or an adhesive having a good affinity for a substrate PEs film is provided on the uppermost layer of the transfer layer is wound up in a roll shape.
It has been found that, even when the printing layer is transferred to the object using the roll-shaped transfer material, there is a problem that the printing layer is not partially or entirely transferred to the object.

When a silicone resin or a fluororesin is used as the resin for the back surface treatment layer of the substrate PEs film, a part of the back surface treatment layer of the substrate PEs film may have a surface opposite to the back surface transfer layer side. And there is a problem that the resin is contaminated by a silicone resin or a fluorine resin.

[0006] In these, after the transfer layer laminated on one side of the substrate PEs film is wound into a roll, blocking occurs due to the winding pressure of the roll and aging, and a part or the whole of the transfer layer is separated from the transfer layer. This is because the film was peeled from the mold layer and transferred to the surface of the substrate PEs film opposite to the transfer layer. A transfer material in which a transfer layer is laminated on one side of a substrate PEs film is generally manufactured and supplied in a roll state, and is transferred to a transfer target by various transfer devices or simultaneous transfer with molding. Therefore, such a problem is inevitable as long as the transfer material is rolled.

When a transfer layer is laminated on the surface opposite to the back treatment layer side by using a roll of a substrate PEs film provided with a back treatment layer made of the silicone resin or the fluorine resin, first, a release layer is formed. Are laminated. The release layer is generally composed of a paraffin-based release agent, a silicone resin-based release agent, a cellulose derivative-based, a melamine resin-based release agent, a polyolefin resin-based release agent, a fluororesin-based release agent, and a urea resin-based release agent. Mold,
The mixed release agent and the like are dissolved in an appropriate solvent to form a coating solution, which is applied to the surface of the substrate PEs film opposite to the back treatment layer side. However, since the surface of the substrate PEs film opposite to the back surface treatment layer is contaminated with silicone resin or fluorine resin, when the coating solution for the release layer is applied to the contaminated surface, repelling occurs in the coating solution. , Resulting in an uneven coating. The release layer thus formed unevenly,
Further, even when a transfer layer is formed by laminating a printing layer and an adhesive layer, and the transfer is performed on the material to be transferred using a transfer device, the transfer is not uniform because the release layer is formed unevenly. There was also a problem that transfer of the image could not be performed.

[0008]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned conventional problems, and an adhesive layer provided on a substrate PEs film for imparting a high-speed transfer function to a transfer material is provided. Even if it is in close contact with the surface opposite to the adhesive layer of the substrate PEs film, by providing the back surface treatment layer on that surface,
Provided is a transfer PEs film in which a transfer layer does not transfer.

[0009]

Means for Solving the Problems The present invention has been made in view of the above situation, and the polyester film for transfer which can solve the above problems is as follows.

(1) A polyester film for transfer, comprising a polyester film having a back surface treatment layer comprising a thermosetting resin (A) and an alkyd resin (B) modified with a saturated fatty acid on one surface. (2) The mixing weight ratio of the thermosetting resin (A) and the alkyd resin (B) modified with a saturated fatty acid is 10 / 90-9.
The transfer polyester film according to the above (1), wherein the ratio is 0/10. (3) The thermosetting resin (A) is a urea resin, a melamine resin, a benzoguanamine resin, a glycoluril resin,
The transfer polyester film according to the above (1) or (2), which is one of an epoxy resin. (4) A change in film haze when the back treatment layer is rubbed with a gauze containing at least one or a mixed solvent of at least one of toluene, methyl ethyl ketone, and ethyl acetate is 1.0% or less. The transfer polyester film according to any one of the above (1) to (3). (5) The transfer film according to any one of (1) to (4), wherein when the polyester film having the back treatment layer is wound into a roll, the back treatment layer does not transfer to the opposite surface of the film. Polyester film. (6) A transfer layer formed by sequentially forming a release layer, a printing layer, and an adhesive layer is laminated on the surface of the polyester film opposite to the surface on which the back treatment layer is provided. Lamination, under a load of 3 kg / cm ² at a temperature of 60 ° C.
The transfer polyester film according to any one of the above (1) to (5), wherein the transfer layer does not transfer to the back treatment layer side after the treatment for 4 hours. (7) The solid coating amount of the back treatment layer is 0.01 to 0.5.
g / m ² , wherein (1) to (6).
The polyester film for transfer according to the above. (8) The polyester film for transfer according to any one of (1) to (7), wherein the polyester film is a polyethylene terephthalate film.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The polyesters (PEs) used in the base film of the present invention include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid or esters thereof and ethylene glycol, diethylene glycol, 1-4 butanediol, Polyester produced by polycondensation of glycols such as neopentyl glycol and 1,4-cyclohexanedimethanol.

The polyester comprising the acid component and the glycol component can be produced by arbitrarily using a commonly used method. For example, a transesterification reaction is performed between a lower alkyl ester of an aromatic dicarboxylic acid and glycol, or a direct esterification of an aromatic dicarboxylic acid and glycol to substantially form a bisglycol ester of an aromatic dicarboxylic acid. Alternatively, a method of forming a low polymer thereof and then subjecting the resultant to polycondensation under reduced pressure at a temperature of 240 ° C. or less is employed. At this time, ordinary catalysts, stabilizers, various additives and the like can be optionally used. Representative examples of such polyesters include polyethylene terephthalate, polyethylene naphthalate, and poly (1,4-cyclohexylene dimethylene terephthalate), with polyethylene terephthalate being preferred. These polyesters may be homopolymers or those obtained by copolymerizing a small amount of the third component, or may be those obtained by mixing these polyesters.

The PEs film referred to in the present invention is a film formed by melt extrusion using a known method and then stretched, and a film having a thickness of 10 to 250 μm is preferably used. Further, the PEs film may contain various stabilizers, ultraviolet inhibitors, antistatic agents, lubricants, pigments, antioxidants, plasticizers, and the like.

The polyester film for transfer of the present invention comprises:
On one side, a backside treatment layer made of a thermosetting resin (A) and an alkyd resin (B) modified with a saturated fatty acid is provided. The used resin does not migrate, and the surface on the side where the transfer layer is laminated is not contaminated with the resin.

The thermosetting resin (A) used for the back transfer layer of the transfer polyester film of the present invention is preferably any one of urea resin, melamine resin, benzoguanamine resin, glycoluril resin and epoxy resin. Accordingly, curing can be promoted using an acid catalyst.
The alkyd resin (B) modified with a saturated fatty acid can be obtained by polymerizing the alkyd resin using myristic acid, palmitic acid, stearic acid, behenic acid or the like as the saturated fatty acid. Further, if necessary, a lubricating agent, an antistatic agent and the like can be contained in the back surface treatment layer.

The mixing weight ratio of the thermosetting resin (A) and the alkyd resin (B) modified with a fatty acid is 10/90 to
It is preferably 90/10. Particularly preferably, 2
0/80 to 80/20. When the mixed weight ratio of the alkyd resin (B) modified with the fatty acid exceeds 90%, the back treatment layer is insufficiently cured, so that the back treatment layer is easily eluted or swelled, and the back treatment without solvent resistance is performed. Layer.

These solvents are solvents used for a coating liquid when a release layer, a printing layer, and an adhesive layer are sequentially laminated on one surface of a substrate PEs film by coating. The release layer, the design layer, and the adhesive layer are laminated by coating each layer, and the solvent is removed in a drying step. However, the solvent cannot be completely removed in the drying step, and a trace amount of the solvent may remain in each layer to such an extent that the function as the transfer material is not impaired.

When the transfer layer formed on the substrate PEs film is wound up in a roll shape in a state containing these trace amounts of solvent, the back treatment layer having no solvent resistance can be formed with the roll winding pressure and aging. The residual solvent swells to increase the affinity of the back surface treatment layer and decrease the film strength.
This is because the affinity between the adhesive layer used to provide the high-speed transfer function and the back treatment layer having no solvent resistance increases, so that the adhesive layer and the back treatment layer are easily adhered to each other, and the transfer layer is subjected to the back treatment. This is because it is easy to transfer to the layer side. Further, even if the transfer layer is not transferred to the back treatment layer side, when the transfer to the object to be transferred by a heating roll using a transfer device, because the film strength of the back treatment layer that contacts the heating roll is weak, The back treatment layer is likely to be transferred to the roll, and the transfer property is likely to be impaired by contaminating the roll or depositing and depositing a degraded substance on the roll.

When the mixing weight ratio of the thermosetting resin (A) exceeds 90%, the affinity between the adhesive layer used for imparting high-speed transfer functionality and the back surface treatment layer is improved. The adhesive layer easily adheres to the back processing layer, and as a result, the transfer layer easily transfers to the back processing layer.

In the present invention, a method of providing a back surface treatment layer composed of a thermosetting resin (A) and an alkyd resin (B) modified with a saturated fatty acid on a PEs film of a substrate includes a reverse roll coater, a gravure coater, and a rod coater. And a method of applying outside the PEs film production process or a method of applying within the PEs film production process using an air doctor coater or an application device other than these.

As a method of applying in the PEs film manufacturing process, 1) a method of applying a coating solution to an unstretched film of PEs and successively or simultaneously biaxially stretching the film, 2) coating a uniaxially stretched PEs film, Further, there is a method of stretching in a direction perpendicular to the uniaxial stretching direction, 3) a method of applying to a biaxially stretched PEs film, 4) a method of applying to a biaxially stretched PEs film, and further stretching in the transverse and / or longitudinal directions. . When applying in the PEs film manufacturing process, a drying process may be appropriately provided.

The amount of coating when laminating the back surface treatment layer is 0.1.
It is preferably from 0.01 to 0.5 g / m ² . Particularly preferably, it is 0.03 to 0.3 g / m ² . When the coating amount is less than 0.01 g / m ² , the solvent resistance of the coating film becomes insufficient, and when the coating film is formed into a roll, a part of the transfer layer is easily transferred to the back treatment layer side. On the other hand, if it exceeds 0.5 g / m ² , curing of the thermosetting resin becomes insufficient, and the solvent resistance tends to deteriorate.

Further, the polyester film for transfer of the present invention is obtained by using a gauze containing at least one or a mixed solvent of at least one of toluene, methyl ethyl ketone and ethyl acetate, which is an index of the solvent resistance of the back treatment layer. The change in film haze when the back treatment layer was rubbed was 1.0
% Or less ", and a release layer on the surface of the polyester film opposite to the surface on which the back treatment layer is provided,
A transfer layer formed by sequentially forming a printing layer and an adhesive layer is laminated, and the transfer layer and the surface of the back surface treatment layer are overlapped with each other, and 3 kg / cm
Under the load of ² , when treated at a temperature of 60 ° C. for 24 hours,
It is preferred that the transfer layer does not transfer to the back treatment layer side. These can be achieved by employing the above means, but are not limited only to the above means.

The transfer material using the PEs film for transfer of the present invention has a back surface treatment layer provided on one side of the substrate PEs film, and a transfer layer (release layer, print layer, (A layer in which an adhesive layer is sequentially laminated).

The release layer is released together with the base PEs film from the transfer layer when the base PEs film is peeled off after the transfer. The release layer material is paraffin-based release agent, silicone resin-based release agent, cellulose derivative-based release agent, melamine resin-based release agent, polyolefin resin-based release agent, fluororesin-based release agent, urea resin-based release agent A release agent and a mixture of these release agents can be used. As a method of forming the release layer,
There are a reverse coating method, a gravure coating method, a wire bar coating method, and a screen printing method.

The printing layer is usually formed on the release layer, but a release layer is further provided on the release layer for the purpose of improving the releasability.
A printing layer may be formed thereon. The release layer is a layer which becomes the outermost layer of the transferred object by being separated from the base PEs film when the base PEs film is separated after the transfer. Acrylic resin, polyester resin,
Cellulose type resin, polyvinyl chloride type resin, urethane type resin, polyvinyl acetate resin and the like can be used. If the release layer requires hardness, a thermosetting resin, an ultraviolet-curable resin, or the like can be used. The method for forming the release layer includes a reverse coating method, a gravure coating method, a wire bar coating method, and a screen printing method.

As the material of the printing layer, acrylic resin,
Examples include polyester-based resins, polyvinyl-based resins, polyamide-based resins, polyurethane-based resins, cellulose-based resins, and alkyd-based resins. These resins are colored with a pigment or dye as a binder to form a printing ink. As a method for forming the printing layer, a normal printing method such as an offset printing method, a gravure printing method, and a screen printing method may be used. The printing layer may be formed of a metal thin film layer or a combination of a metal thin film layer and a printing layer.

The metal thin film layer is formed by a vacuum deposition method, a sputtering method, an ion plating method, a plating method, or the like.
In some cases, a metal thin film layer is partially provided depending on a design to be expressed. As a method of partially forming a metal thin film layer, after forming a solvent-soluble resin on a portion that does not require a metal thin film layer, a metal thin film is formed on the entire surface thereof, and the metal thin film is washed with a solvent. There is a way to remove it. Water is often used as a solvent in this case. Also, as another method, a metal thin film is formed on the entire surface, and then a resist layer is formed on a portion where the metal thin film is to be left,
There is a method of removing the resist layer by etching with an acid or an alkali.

The adhesive layer is a layer for adhering each layer of transfer onto the object to be transferred. It is necessary to select a resin suitable for the material of the transfer object for the adhesive layer. For example, if the material of the transfer object is a polystyrene-based resin or a polycarbonate-based resin, an acrylic resin, a polystyrene-based resin having an affinity for these,
Polyamide resin, ester resin, urethane resin,
An ester urethane resin may be used. Also,
When the material of the transfer object is an acrylic resin, an acrylic resin is preferably used. Further, when the resin of the transfer object is polypropylene, a chlorinated polyolefin resin or the like can be used. Examples of the method for forming the adhesive layer include a gravure coating method, a reverse coating method, a wire bar coating method, and a comma doctor coating method.

As a method for transferring these transfer films,
After setting the transfer film so that the adhesive layer is in contact with the molding resin in the mold of the injection molding machine or the blow molding machine, and the method of transferring to the transferred object with the heating roll using the transfer device,
In general, so-called simultaneous molding transfer is performed in which a molding resin is injected or blown, a molded product is taken out from a mold after cooling, and a transfer film is peeled off.

[0032]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples. In the examples and comparative examples, “parts” means “parts by weight”.

1) Change in haze Using a Gakushin type friction tester (manufactured by Yamaguchi Kagaku Sangyo Co., Ltd.), the gauze was reduced to at least one of toluene, methyl ethyl ketone and ethyl acetate, or 1/1 of any two of the above. Impregnate the mixed solvent. The back surface treatment layer of the transfer polyester film is rubbed 10 times with a load of 500 g.
The haze (%) of the rubbed film is measured with a haze meter (manufactured by Tokyo Denshoku Co., Ltd.), and the difference from the haze value before rubbing is calculated.

2) Transferability of Back Processing Layer to PEs Film The surface of the PEs film on the non-processing surface side and the surface on the back processing layer side are overlapped, and a load of ² kg / cm ² is applied. After standing for 15 minutes, the non-processed surface and the back-processed layer side of the superposed films are manually peeled off, and the non-processed surface is made up of 3% solid content of paraffin wax with a solvent using a wire bar # 3. Hand coat. The coated surface was visually determined and ranked as follows. No coated cissing ○ Coated cissing ×

3) Adhesion between Back Treatment Layer and Transfer Layer Adhesive An ester resin having a glass transition point of 6 ° C. is dissolved as an adhesive on a surface of the PEs film opposite to the back treatment layer with a solvent to obtain a solid content of 20%. Of the coating liquid. After hand-coating with a wire bar # 5 and drying, the surface on the side of the adhesive layer and the surface on the side of the back treatment layer are overlapped and treated at a temperature of 60 ° C. for 24 hours under a pressure of 3 kg / cm ² . The surface of the film on the side of the adhesive layer and the surface of the film on the back side are peeled off by hand, and the adhesion (blocking) is visually determined. No adhesion between adhesive layer and backside treatment layer ○ Adhesion between adhesive layer and backside treatment layer × (breaking of film may occur)

4) Amount of solid coating A film sample is cut into a size of 10 cm × 10 cm. Using a direct balance (manufactured by Shimadzu Corporation), weigh the g
Measure up to four decimal places in units. After the measurement, the coated surface is completely removed with a solvent of methyl ethyl ketone. Measure the weight again and calculate the weight difference. If the weight difference is multiplied by 100,
The solid coating amount (g / m ² ) can be calculated.

[Production of Alkyd Resin Modified with Saturated Fatty Acid] Phthalic anhydride and glycerol are heated to 180 ° C. to form a first stage syrup, and molten stearic acid is added to esterify free hydroxyl groups. Heating is continued from 180 ° C. to 220 ° C. until the acid value becomes 10 (KOH mg / g) to obtain a stearic acid-modified alkyd resin.

Example 1 Methylated melamine resin (Sumitomo Chemical Industries: Sumimar M-
100) 7 parts, stearic acid-modified alkyd resin 3 parts, P-toluenesulfonic acid 1 part as acid catalyst, toluene 9
A coating solution having a solid content of 10% by weight dissolved and prepared in 0 parts was gravure coated on one surface of a biaxially stretched polyethylene terephthalate film having a thickness of 25 μm. After coating, the coating was dried at a temperature of 160 ° C. for 30 seconds, and a solid coating amount of 0.05 g /
It provided back coating layer of m ^2. Table 1 shows the properties of the obtained PEs film for transfer.

Example 2 In Example 1, 3 parts of melamine resin (Sumitomo Chemical Co., Ltd .: Sumimar M-100) and alkyd stearate resin 7 were used.
Example 1 was repeated except that a coating solution prepared by dissolving 1 part of P-toluenesulfonic acid in 90 parts of toluene was used. Table 1 shows the properties of the obtained PEs film for transfer.
Shown in

Example 3 In Example 1, a polyethylene terephthalate film having a thickness of 38 μm was used, and the solid coating amount was 0.20 g / m 2.
Except that it was set to ² , it was the same as Example 1. Table 1 shows the properties of the obtained PEs film for transfer.

Example 4 The procedure of Example 1 was repeated, except that the stearic acid was replaced by a behenic acid-modified alkyd resin of a saturated fatty acid. Table 1 shows the properties of the obtained PEs film for transfer.

Example 5 The procedure of Example 1 was repeated, except that the melamine resin was replaced by a glycoluril resin (Mitsui Cytec: Cymel 1170). The obtained PE for transfer
Table 1 shows the properties of the s-film.

Example 6 In Example 1, a benzoguanamine resin (Dainippon Ink Chemical: Super Beckamine T) was used in place of the melamine resin.
D-126), except that it was changed to D-126). Table 1 shows the properties of the obtained PEs film for transfer.

Comparative Example 1 The procedure of Example 1 was repeated except that the polyethylene terephthalate film was not provided with a back surface treatment layer. Table 1 shows the properties of the obtained PEs film.

Comparative Example 2 The procedure of Example 1 was repeated, except that the back treatment layer was changed to an addition reaction type silicone resin (DK-Q3-203 manufactured by Dow Corning). Table 1 shows the properties of the obtained polyester film for transfer.

Comparative Example 3 Methylated melamine resin (Sumitomo Chemical Industries: Sumimar M-
100) The procedure of Example 1 was repeated except that 10 parts and 1 part of P-toluenesulfonic acid as an acid catalyst were dissolved in 90 parts of toluene. Table 1 shows the properties of the obtained PEs film for transfer.
Shown in

Comparative Example 4 10 parts of alkyd stearate resin and P-
Example 1 was repeated except that 1 part of toluenesulfonic acid was dissolved in 90 parts of toluene. Table 1 shows the properties of the obtained PEs film for transfer.

[0048]

[Table 1]

[0049]

The transfer polyester film of the present invention has a specific back treatment layer on one side of the base polyester film, and a transfer material having a transfer layer provided on the opposite side of the back treatment layer is formed into a roll. The uppermost adhesive layer of the transfer layer used for imparting the winding and high-speed transfer functions is PEs on the opposite surface.
The transfer layer does not transfer to the opposite surface because the specific back surface treatment layer having the solvent resistance and the appropriate hardness is provided even if it is brought into close contact. Therefore, the transfer layer (adhesive layer / print layer) can be transferred from the transfer material to the transfer target at a high speed. The present invention is applicable not only to the transfer polyester film but also to the release P film.
The invention can be applied to an Es film or the like.

Claims (8)

[Claims] 1. A transfer polyester film comprising a polyester film and a back surface treatment layer comprising a thermosetting resin (A) and an alkyd resin (B) modified with a saturated fatty acid on one surface. 2. The mixing weight ratio of the thermosetting resin (A) and the alkyd resin (B) modified with a fatty acid is 10/90.
The polyester film for transfer according to claim 1, wherein the ratio is from 90 to 90/10. 3. The thermosetting resin (A) is a urea resin,
3. The polyester film for transfer according to claim 1, wherein the polyester film is any one of a melamine resin, a benzoguanamine resin, a glycoluril resin, and an epoxy resin. 4. The change in film haze when the back treatment layer is rubbed with gauze containing at least one or a mixed solvent of at least one of toluene, methyl ethyl ketone, and ethyl acetate is 1.0% or less. The polyester film for transfer according to claim 1, wherein: 5. The transfer polyester according to claim 1, wherein when the polyester film having the back surface treatment layer is wound into a roll, the back surface treatment layer does not transfer to the opposite surface of the film. the film. 6. A transfer layer formed by sequentially forming a release layer, a printing layer, and an adhesive layer on a surface of the polyester film opposite to the surface on which the back treatment layer is provided. The surfaces are superimposed and the temperature is 6 under a load of 3 kg / cm ^2.
The transfer polyester film according to any one of claims 1 to 5, wherein the transfer layer does not transfer to the back treatment layer side when treated at 0 ° C for 24 hours. 7. The solid coating amount of the back treatment layer is 0.01
Transfer polyester film of claim 1 to 6, wherein it is to 0.5 g / m ^2. 8. The transfer polyester film according to claim 1, wherein the polyester film is a polyethylene terephthalate film.