JPS59167290A - Substrate for transfer or exfoliated picture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention consists of an absorbent paper with an applied barrier layer and a water or heat soluble separating layer for receiving on one side a peelable printing layer and/or a lacquer layer. The present invention relates to a transfer or peelable image support.

Transfer or release images for use on ceramic products, porcelain, porcelain, enamel, pottery surfaces and the like are known. These mainly consist of a water-permeable paper support blade 1, on which a releasable adhesive coating is applied, for example consisting of a covering lacquer mask containing a decorative image consisting of inorganic pigments.

Known paper support (West German Patent Application No. 2551860)
No. 4,049,860) contains a water-soluble separation [i: on which a later releasable printing is performed. The separation layer is more or less hygroscopic and exhibits varying curling properties during storage.

If the transfer or release image is printed by an offset method, a dampening agent, e.g. water, is brought into contact with the separating layer as part of the process, followed by a powder dyeing agent, various pigments, e.g. gold oxidation, etc. Objects are image-wise distributed onto the surface. In this step, it cannot be excluded that the powdered bleaching agent also washes into the non-image areas due to the slightly viscous nature of the surface. This is particularly a problem if the sheet is subjected to this operation several times for multicolor printing. Subsequently, when a layer of image-fixing sinker is applied, the powder particles are also undesirably fixed in non-image areas, which means that, for example, after transfer or release of a release image to a Sesimink substrate, the powder particles are fixed in the non-image areas. Unusual impurity (N color) occurs in the area.

It is therefore an object of the present invention to provide a transfer or peeling method which reduces or eliminates the effect of moisture on the curling tendency of a support made of absorbent paper and which substantially eliminates the formation of stickiness on the separating layer surface. It helped by providing a support for the image.

Furthermore, it is an object of the present invention to enable or improve the printability (for example, in offset printing methods) of a heat-meltable separation layer when it is present.

This task also involves a transfer consisting of an absorbent paper with an applied barrier layer and a water- or heat-soluble separation layer for receiving a peelable printing layer and/or a layer of lacquer on one side. This problem can be solved by providing a hydrophobic top coat consisting of a polymerized acrylic ester on the separation layer of the image support. Advantageously, the dog coat coverage (less than 5 f'/m', especially about 0.5-2
9/lr? Exist within the range of

According to the invention, it is possible to obtain a barrier layer for a water-soluble separation layer from a printed, printed and/or lacquer layer, which itself completely repels impinging water jets. On the other hand, the transferred or peeled off image can be removed unhindered from the support depending on the size of the lacquer mask covering the image. This is because, when the separation layer dissolves, the dog coat of the invention decomposes or crumbles due to the coating strength being too low.

However, advantageously, a relatively thin layer of the dog coat of the invention can be applied in a continuous coating process from a low concentration to a support, for example by a screen roller or an intaglio printing press, in a final step without additional drying. It has been established that there is no need to connect the processes. Furthermore, the barrier layer achieves satisfactory printability in offset printing processes.

Polymerized acrylic esters have been found to be the most preferred materials for the hydrophobic dog coats of the present invention. On the one hand, these esters have good film-forming properties, and on the other hand, they exhibit low strength in thin layers and can therefore be decomposed during the stripping process of the separation layer. They have a significantly low water absorption capacity and, depending on the application method, can be incinerated without leaving any residue when transferred to an object together with a transferred or peeled-off image. Even during the heat-based peeling process, the thin top coat decomposes and does not interfere with subsequent processes.

Among the polymerized acrylic esters, 1 in the Al≧R group
~Alkyl methacrylate with 4 carbon atoms °0
Mono- or co-monoconjugates have proven to be particularly advantageous. Particularly suitable is methyltutaacrylate. Approximately 2
．． Any negative compound having a molecular weight within the range of 5,000 to 350,000 can be used. Those with a molecular weight of "m" are very useful. These range from about 100 to about 3500 as measured in a solution of 37.5% by weight in toluene: TIP
It has a viscosity of O,S.

The present invention will now be described in detail with the illustrated embodiment VC. The drawings are enlarged schematic cross-sectional views of supports for transfer or peel-off images. The drawings show a paper support having an average weight per unit area of about 100-200 lbs. The paper support has a barrier layer 2, which reduces the porosity of one surface of the paper. This may consist of surface tweezing or other paints with or without Q1 clay fillers made of, for example, starch, casein, glue, alkali metal resilicates, water glass, etc. Due to the presence of barrier layer 2, 1 is applied for separation layer 3.
Prevents excessive penetration and absorption of materials. It is selected from water-soluble hexa-, oligo- or polysaccharides. Especially using dextrins. The separating layer 3 can be formed using polymer examples such as phosphoricol or phosphoric vinyl alcohol, either individually or in admixture with each other.

The top coat of the present invention is designated 4.

As mentioned above, a polymerized acrylic ester is used for this purpose. The topcoat has the ability to reduce and/or retard the penetration of water into the paper from the printing and/or ranker layer side, thus preventing deformation of the paper support (curling tendency) and, on the other hand, preventing the dissolution process of the separation layer. It acts so as not to interfere with the peeling process. For these reasons, it has been found that it is disadvantageous to apply the topcoat v as thinly as possible, and therefore a coating weight of less than 55'/- is sufficient.

It has been found that applying a coating weight in the range from 0.5 to A297 m' is the most disadvantageous for commercial applications.

The tongue coat 4 is applied as a solution onto the water bathable NiL layer 3 using a screen roller or an intaglio printing press. As the bath agent, an aromatic compound with a boiling point of 100 ft. ft., for example toluene, or a common ketone or ester is used. When applying the solution, care should be taken so that the solvent used does not affect the underlying separation layer 3 VC and does not have a substantial dissolving effect.

The working viscosity of the bath liquid should be polymerized acrylic ester,
Resulting from the selection of bath additives and solids concentration of the bath liquid. This also depends on the application method chosen.

The following experiments demonstrate advantageous embodiments of the topcoat of the present invention with respect to the properties of the pigment in the non-image area and quantitative and qualitative results with respect to the water absorption capacity of the paper support by the topcoat surface depending on the coating weight. This is what is shown.

A sheet of paper with a weight per unit area of 150 centimeters and a barrier layer made of starch and a separation layer made of textrin on the surface, suitable as a support for a release image, was coated with methyl methacrylate as a top coat. [Elbasite (Elv)
aci+e(3)) 2010゜Teubon Co., USA] at a dry coating amount of 0.5 and 1.

3 and 52h? It was applied from a 2.5-chi solution. An untreated support was used as a control.

The sheet was sprinkled with pigment (in this case iron oxide) and then wiped off with a clean wool band.

It was confirmed that pigment particles remained on the sheet of paper used as a control. This was visible to the naked eye as a brownish discoloration. Furthermore, the number of sheets is already 0.
．． 5f! It was found that at the minimum coating amount of /-, it appeared to have no hue, and at the coating amount of 52/-, there was almost no hue.

In order to determine the amount of water absorbed by the paper support over the surface of the paper support adjacent to the separating layer, sheets were subjected to seven tests according to the method of Cobb, as previously described. In this case, contact was made with a defined amount of liquid.

At this time, the amount of water absorbed per R was measured for an action time of 2 minutes.

The obtained values are summarized in the table below: Top coat Water absorption (2 minutes)
y/lr? 0
〉30 0.5 20 8 5 2 These values show a clear dependence of water absorption on the amount of top coat applied. But 1.0.5ri/n? It was found that a water absorption amount of 2 (H', /-) in the top coat, which dictates the coating amount, still has a water repellent effect for several hours. There is already enough to do that.

In another test, a pre-moistened rubber roll was rolled over the paper surface. The sheets without the topcoat of the invention curled towards the back side of the paper due to water absorption, whereas the sheets with the topcoat of the invention remained curly and flat. In this case, 0.5f/rr? The behavior of the sheets coated with P corresponded to sheets with already high coating weights.

Summary based on experiments p1 The top coat of the present invention has a separation layer that reduces surface tackiness, prevents undesirable adhesion of pigments, prevents water absorption on one side of the paper support, and prevents curling of the paper support. It has been found that this can be delayed or prevented so that it no longer occurs.

Despite the asymmetrical structure of the material according to the invention with respect to water absorption on both sides of the paper, no change in flatness properties occurs during storage under varying air humidity conditions, unlike uncoated paper.

[Brief explanation of the drawing]

The drawing is a schematic cross-sectional view of the transfer or peelable image support of the present invention. 1...Paper support 2...Barrier layer 3...Separation layer
4... Tomp coat

Claims (1)

[Claims] 1. Peelable printing layer and/or lacquer layer on one side @
A transfer or peelable image support consisting of an absorbent paper having a barrier layer applied thereon and a water or heat soluble separation layer for reception on the separation layer, wherein a hydrophobic tompcoat consisting of a polymerized acrylic ester is provided on the separation layer. A support for transfer or peelable images, characterized in that: 2 Is the amount of Tompcoat applied 59/n? The support according to claim 1 dd, which is less than or equal to 3. The amount of Tompcoat applied is about 0.5-29/rr? The support according to claim 2, which is within the range of . 4. The polymerized acrylic ester is a mono- or copolymer of alkyl methoxylate containing 1 to 4 carbon atoms. The support according to any one of claims 1 to 3. 5. The support according to claim 4, wherein the polymerized acrylic ester is methyl methacrylate.