JPS597594B2 - How to transfer paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION More specifically, the present invention is a method for transferring a pattern onto an object to be transferred, in which a pattern is transferred to an object to be transferred such as glass, porcelain, metal, Bakelite, etc. using a transfer paper, and then the image is printed. The present invention relates to an improved method of transfer.

In the above-mentioned transfer method that has been commonly used,
After the transfer painting is applied to the transferred object using transfer paper, many steps such as paper removal, varnish removal, washing, and drying of the transferred object are required, and defects such as image bleeding occur.

On the other hand, there are transfer methods that do not require water, such as the
The methods described in Japanese Patent Nos. 6-17318 and 47-12650 tend to lack simplicity in steps, such as requiring pretreatment with an organic solvent. The present invention aims to eliminate the drawbacks of the above-mentioned conventional methods,
Simply mark the transferred part of the object, that is, the part to be painted, by 8.
To provide an improved transfer method that simplifies the transfer process by simply heating the transfer paper to a transfer temperature of 00 to 150°C and directly pressing the transfer paper onto the transfer target area to transfer the pattern. .

The present invention will be explained in detail below.

The mount of the transfer paper used in the present invention is a commercially available release paper, and the heated transfer area is directly placed on the mount.
A low-molecular-weight thermosetting resin that softens and adheres to the transferred material at a transfer temperature of 150°C is replaced with a high-molecular-weight thermosetting resin that has a considerably larger molecular weight and does not have the property of softening and adhering to the transferred material at the above transfer temperature. 30 to 50 for thermosetting resins with the same molecular weight
A desired pattern is printed in accordance with the color tone using a decorative printing ink mainly containing a thermosetting resin added in an appropriate amount in a range of % by weight by an appropriate printing method such as screen printing. In addition, in the above-mentioned printing ink for decoration, the amount of the low molecular weight thermosetting resin added to the high molecular weight thermosetting resin is an important requirement that influences the transfer performance. In other words, the transfer performance of the transfer paper is (a) that clear resolution of the details of the image can be obtained during the transfer, (b) that there is no image bleeding or bleeding in the transferred image, and (c) that it does not transfer to the surface of the transferred object. (d) the transferred pattern has good durability after baking and hardening; and (e) the unused transfer paper has good storage stability. In response to this requirement, in the above-mentioned decorative printing inks, high molecular weight thermosetting resins are not suitable for low molecular weight thermosetting resins due to their characteristics (b), (d), and (e). However, regarding the above performance (c), it is inferior to low molecular weight thermosetting resins with a low melting point. Regarding performance (a) above, high-molecular weight thermosetting resins have low fluidity and cannot provide the desired resolution, while low-molecular weight thermosetting resins have fluidity but do not provide detailed image detail. This method also has the drawback of not being able to provide the desired resolution. As a result of various experiments, the inventor of the present application found that when a low molecular weight thermosetting resin is added in a range of 30 to 50% by weight to a high molecular weight thermosetting resin in a decorative printing ink,
It has been found that the transfer paper can be provided with the above-mentioned transfer performance to a substantially satisfactory degree. Therefore, printing inks for decoration are made by adding a low-molecular-weight thermosetting resin to a high-molecular-weight thermosetting resin, taking into consideration the pigments, curing agents, etc. that make up the ink, and the printing suitability depending on the printing method. The amount is 30-5
It is determined within the range of 0% by weight.

After printing a pattern on a backing paper using the above-mentioned printing ink for decoration, the desired transfer paper is obtained by leaving it to dry until the solvent in the ink components disappears. The transfer paper obtained in this way is directly pressed onto the transferred part of the transferred object that has been heated to a transfer temperature of 8 to 150 degrees Celsius, and if necessary, a rubber stopper-like object wrapped in gauze is used. The crimping effect is sufficient if it is crimped uniformly with a force of /A.

At this time, the low molecular weight thermosetting resin in the ink printed on the transfer paper is softened by the temperature of the transfer area, and the pattern on the transfer paper is well adhered to the transferred object. However, if the temperature of the transferred area, that is, the transfer site, is too high, the transferred pattern will bleed, while if it is too low, the pattern will not be completely transferred. Then,
If you leave it as it is, and when the temperature of the transferred area falls below 50℃, remove the backing paper and the pattern will be completely transferred to the object. Attachment is complete. The preheat temperature of the transfer site and the baking conditions are determined by the type of thermosetting resin, curing agent, organic pigment, etc. of the decorative printing ink used. In the case of the following example, the residual heat temperature of the transfer site of the transferred object is 110°C ± 10°C, the baking conditions for curing the thermosetting resin are a maximum temperature of 230 to 240°C, and the temperature increase rate is 1 hour and 30 minutes. Adjust to reach this maximum temperature.

Once this maximum temperature (actually reached 235°C) is reached, turn off the heat source, leave it to stand, and take it out at ~80°C. The duration is approximately 1 hour and 30 minutes to 2 hours. In this case, care must be taken because if the maximum temperature exceeds 250°C and is baked for a long time, the color will change, and if the maximum temperature is below 200°C, the hardness of the surface of the transferred pattern will be poor. Next, an example of a printing ink using a bisphenol A-based epoxy resin as a thermosetting resin will be shown.

The above ingredients are thoroughly kneaded using three rolls. The curing agent used in the above ink is determined on the condition that it has a long pot life. That is, BF3-monoethylamine B
F3・NH2・CH2・CH, (manufactured by Hashimoto Kasei) (hereinafter B
It is abbreviated as F3-MEA. ) to butyl cellosolve 10
A solution containing % by weight was used. The mixing ratio of this curing agent and ink was BF3-M to ink 20 of Example 1.
EAlO % solution 2 is suitable, and in the case of the ink of Example 2 it is BF3-MEAlO % solution 3 for 20 ink amounts. Immediately before printing, both are sufficiently kneaded in this ratio and then printed on the mount. In the above, bisphenol A is used as the main thermosetting resin of the printing ink for decoration.
Although an example using a thermosetting epoxy resin has been shown, it is possible to use other thermosetting resins.

The present invention is carried out as described above, and the transfer paper is directly pressed onto the transferred part by simply heating the transferred part of the transferred object, that is, the part to be painted, to a transfer temperature of 80 to 150°C. The transfer method of the present invention allows for good transfer of the image, and also allows the transferred image to be printed as is to harden the thermosetting resin of the image to complete the transfer. It has the advantage of being simpler than other methods.

Next, the second invention of the present invention will be explained. When the transferred part of the transferred object has a complicated shape or when it is necessary to accurately determine the transfer position, if the transfer paper's backing is paper, it will be difficult for the transfer paper to fit into the transferred part. It has the disadvantage that it is difficult to press and it is not easy to accurately determine the transfer position. In order to eliminate this drawback, the second invention is a further improvement of the first invention. That is, in the second invention, the base of the transfer sheet is a transparent polypropylene film coated with a water-soluble resin, and the above-mentioned painting material used in the first invention is applied on top of the transfer sheet. A transfer sheet is obtained by printing an appropriate pattern using printing ink. In the second invention, as in the case of the first invention, the transferred portion of the transferred object is heated to a transfer temperature of 8°C to 150°C, the above-mentioned transfer sheet is directly pressed onto the transferred portion, and then released. After cooling, remove the polypropylene film from the transfer sheet, transfer the design on the transfer sheet to the object, wash off the water-soluble resin film remaining on the transferred area with water, and then print the transferred design as is. This is used to harden the thermosetting resin of the pattern.

Although the transfer sheet is directly pressure-bonded to the transferred area heated to a transfer temperature of ~150°C, the base of the transfer sheet is polypropylene film, so the transferred area has a complicated shape. It also softens and blends well and can be pressed, resulting in good transfer of the pattern.

In addition, since the polypropylene film is transparent, when pressing the transfer sheet onto the transfer target area, the lower transfer target area can be seen through the base from above, so the transfer position of the image on the transfer sheet can be transferred to the desired location. has the advantage that it can be determined accurately and easily. Next, after directly press-bonding the transfer sheet to the transferred area as described above, when the base polypropylene film is peeled off, only the film can be easily peeled off because the water-soluble resin coating is applied on top of the polypropylene film. The water-soluble resin remains covering the surface of the transferred image.

It may be baked as is, but since this will change the finished color tone, the resin layer is removed by washing with water and the transferred design is printed as is without drying.
An example in which a water-soluble resin coating was applied on a transparent polypropylene film is as follows. As the resin, a water-soluble acrylic resin 1CH2-CIH+, which has particularly good releasability to polypropylene film, was used.

Claims (1)

[Scope of Claims] 1. A low molecular weight thermosetting resin that softens and adheres to the transferred object at the transfer temperature of the heated transferred area as shown below is placed on the mount, and the above transfer material has a considerably larger molecular weight than the above transfer temperature. For painting, the thermosetting resin is made by adding an appropriate amount in the range of 30 to 50% by weight to the same high-molecular-weight thermosetting resin that softens at temperature and does not have the property of adhering to the transferred object. Prepare a transfer paper with a suitable pattern printed on it using printing ink, and apply the transferred part of the object such as glass, porcelain, metal, Bakelite, etc. to 80%.
The transfer paper is heated to a transfer temperature of 150 °C to 150 °C, and the transfer paper is directly pressed onto the transfer target. After cooling, the mount of the transfer paper is peeled off and the pattern on the transfer paper is transferred to the transfer target. A method for transferring a pattern onto an object to be transferred, characterized by curing a thermosetting resin of the pattern by printing the transferred pattern as it is. 2. A water-soluble resin coating is applied on a transparent polypropylene film, and on top of that is a low molecular weight thermosetting resin that softens and adheres to the transferred object at the transfer temperature of the heated transferred area as shown below. A thermosetting resin with an appropriate amount in the range of 30 to 50% by weight is added to the same high molecular weight thermosetting resin that has a considerably larger molecular weight and does not soften at the above transfer temperature and does not have the property of adhering to the transferred material. Prepare a transfer sheet printed with an appropriate pattern using a decorative printing ink mainly composed of a synthetic resin, and apply the transferred part of the object such as glass, porcelain, metal, Bakelite, etc. to a transfer temperature of 80° to 150°C. The above transfer sheet is directly pressed onto this transfer target area, and after cooling,
Peel off the polypropylene film of the transfer sheet, transfer the design on the transfer sheet to the object to be transferred, wash off the water-soluble resin coating remaining on the transferred area with water, and then bake the transferred design as it is to heat the design. A method for transferring a pattern onto a transfer object, which method comprises curing a curable resin.