JPH0549476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention comprises a support material and a pressure sensitive adhesive coating, a plastic bond transfer coating layer is disposed between the support material and the pressure sensitive adhesive coating, and a plastic bond transfer coating layer is disposed between the support material and the pressure sensitive adhesive coating. Transfer coating layers relate to flexible multilayer transfer tapes for correction and marking with stronger adhesion to the support as opposed to pressure-sensitive adhesive coatings.

Prior Art: A number of methods are known in which liquid systems containing pigments are used to conceal mistyped indicia.
In the office, a white pigment dispersion containing a highly volatile organic solvent is applied with a brush to correct typed text, etc. However, evaporation of highly volatile organic solvents is harmful to the environment. It is necessary to wait for a relatively long time until the evaporation is finished and modification types are possible. Application of the modified dispersion by brush generally does not result in a uniform coating.

A relatively good modification is made possible by DE 26 26 891, which describes a multilayer flexible transfer sheet, which consists of a flexible support coated with an adhesive separation layer, polyvinyl Consists of an alcohol-bonded transfer layer and a thin adhesive coat. The transfer layer also contains titanium white as pigment. After removing the support, the transfer layer serves as a correction coating for mistyped characters. It is not described for use with hand transfer rolls as described below in connection with the present invention and, as found in testing,
The desired smooth release of the correction coating cannot be achieved.

OBJECT OF THE INVENTION It is an object of the present invention to be able to apply the correction and marking transfer tape neatly and firmly to the areas where the plastic-bonded transfer coating layer is to be hidden, and without using manual tools. Another object of the present invention is to further improve the ease, speed and uniformity of application to paper by the use of .

Means for Solving the Problem: This problem is achieved by the present invention, wherein the plastic-bonded transfer coating layer contains a soluble cellulose derivative;
The derivative is present in the transfer coating layer in an amount of about 0.5 to 5% by weight.

The flexible transfer tape support according to the invention comprises:
It preferably comprises plastic films such as those used in connection with typewriter ribbon supports, such as polyethylene terephthalate, polypropylene, polyethylene, polyvinyl chloride and polycarbonate. Silicone coated papers are also suitable as supports. The silicone coating reduces adhesion between the plastic bonded transfer coating layer and the support. Instead of silicone coatings, various antiblocking agents can also be used, such as polytetrafluoroethylene.

Effect: The thickness of the support material is preferably about 10 to 60 μm, especially about 15 to 55 μm, the plastic bonding layer has a thickness of about 5 to 40 μm, especially about 15 to 25 μm,
The thickness of the pressure-sensitive adhesive film is about 1 to 8 μm, especially about 2 μm.
~5μm. In order to optimize the transfer tape according to the invention, it is suitable to choose a thickness ratio of pressure-sensitive adhesive coating and transfer coating layer of about 1:4 to 1:12, in particular about 1:8 to 1:10.

The pressure sensitive adhesive coating may consist of a commercially available pressure sensitive adhesive. These are materials that form elastic, permanently adhesive adhesives with high adhesive strength and adhere instantly to various surfaces under limited pressure at ambient temperatures. These are preferably applied in the form of an aqueous solution to the transfer coating layer already arranged on the support.
This is because in this way the already formed plastic-bonded transfer coating layer does not dissolve again. Of this type of pressure-sensitive adhesives, those based on acrylates are particularly advantageous. The starting material is rubber,
Viscous solutions or dispersions based on polyacrylate, polyvinyl ether or polyvinyl isobutylene. Polyacrylate materials are preferred.
Suitable commercially available products include Ucecryl 913R and
Ucecryl PC80 (located in Ammericht, Belgium)
commercially available from UCB) and plastic dispersions
VP859/6 (commercially available from Freihoff). Desirably, the pressure-sensitive adhesive to be applied, which is usually present in an aqueous medium, contains a wetting agent or a surfactant (sold under the trademark Byk W). The solution or dispersion of a pressure-sensitive adhesive for forming a pressure-sensitive adhesive coating comprises:
In particular about 1 to 5 g/m ² , advantageously about 2 to 4 g/m ²
is applied to the transfer coating layer in an amount of .

Preferably, the thermoplastic or thermoelastic polymer is used in the form of a solution or dispersion to form the plastic bond transfer coating layer. Within the scope of the invention, the following substances are advantageously used for solving the problem: (a) Polyurethanes with a molecular weight of 15,000 to 50,000, such as Permuthane U4924 from Stahl-Chemie or
Desmolac 2100 from Bayer; (b) Linear saturated polyesters with molecular weights between 20,000 and 30,000, such as from Goodyear Tire & Rubber.
Vitel PE 307, (c) Styrene-isoprene-styrene copolymers, such as Shell-Chemie's CariflexTR
1107, (d) acrylates and methacrylates, such as Pexigum 7H from Ro¨hm, (e) diphenylcarboxylic acid-modified polyamides, such as Scope 30 from Rhone-Poulenc or
Emerez 1533 from Emery Chemicals, (f) Vinylpropionate polymer dispersions, such as Propiofan 6D from BASF, (g) Water-soluble polymethacrylates containing carboxymethyl groups, such as Rohagit SD15 from Ro¨hm.

This list is neither complete nor limiting in terms of selection. It will be readily apparent to those skilled in the art that other binders can be used, particularly as the nature of the binder plastic does not form the subject matter of the invention.

In order to achieve optimal practice of the invention, the nature of the plasticizer used must be taken into account when selecting a binder plastic for forming the transfer coating layer. When the transfer coating layer is applied to the surface to be modified or concealed, the plasticizer generally does not penetrate the thin pressure-sensitive adhesive coating, does not come into contact with the area to be modified or the colorant applied thereto, and does not interfere with the colorant. It is necessary to use a material that does not cause undesired dissolution and discoloration of the transfer coating layer. Common plasticizers such as silicones, castor oil and mineral oil have proven suitable. Other plasticizers which are used advantageously in other fields, such as phthalates and oleyl alcohol, are unsuitable. In exceptional cases, so-called "lakes" can be added to the plastic bonded transfer coating layer in order to prevent the adverse effects of plasticizers. The lake precipitates or renders the migrating colorant insoluble so that it does not migrate to the applied transfer coating layer and recolor it. Suitable lakes are tannins and tannin derivatives. Lakes of the type generally known in the ink and India ink art can be used. The lake is preferably about 0.5 to 5% by weight, especially 1.5 to 5% by weight, in the plastic bond transfer coating layer.
An amount of 3.5% by weight is present. About 2-2.5% by weight is particularly advantageous.

During the production of the transfer tape according to the invention, the binder plastic selected for forming the transfer coating layer is preferably in the form of a solution or, if a polymer dispersion is present, used as a dispersion. The choice of solvent will depend on the nature of the plastic used. Alcohols such as ethanol, isopropanol and butanol; ketones such as acetone and methyl ethyl ketone; esters such as methyl- and ethyl acetate; aromatic hydrocarbons such as toluene; aliphatics such as benzine with a boiling point range of 70-140°C It is advantageous to use low-boiling or medium-boiling organic solvents from the group of hydrocarbons, alone or in mixtures, and to use water alone or in admixture with low-boiling water-soluble organic solvents. The concentration of plastic in the solution or dispersion is not critical to the invention. As a rough guide, this concentration is
It ranges from about 3 to 15% by weight, especially from about 4 to 10% by weight. To form the transfer coating layer, the solution or dispersion is applied to the support in an amount of preferably 15 to 25 g/m ² , particularly preferably 18 to 22 g/m ² .

The term "colorant" in the present invention has a very broad meaning and is a collective noun for all color-imparting substances, including dyes and pigments, where the pigments also have filler properties. Dyes are colorants that, unlike insoluble pigments, are soluble in water, organic solvents, or binder plastics. Coloring may appear directly or may be expressed by fluorescence. Fluorescence is
For example, this applies to fluorescent light emission colors. When the transfer tape of the invention is used for modifying typed characters, image displays, etc., the plastic bonded transfer coating layer contains white pigments such as titanium white, precipitated calcium carbonate, alumina or colloidal silicic acid, among others. When coloring the transfer coating layer, the colorants used are inorganic pigments such as chrome yellow, ocher, iron oxide red, cobalt blue, ultramarine blue, Berlin blue, or alkali blue, phthalocyanine, azide dye, anthraquinonoid,
organic pigments such as metal complex pigments and carbon black and iron oxide black. Examples of fluorescent dyes are Dayglo's Blaze Orange T50, Ciba
Geigy's Maxilonbrillant Flavin 10 GFF,
Bayer AG's Pyranin and BASF's
Basonyl-Rot 540.

Control of the optimum hiding power of the transfer tapes of the present invention, particularly of the plastic bonded transfer coating layer, is effected by the pigment content. The optimum pigment content will vary depending on various factors such as the binder selected, the actual pigment and any additives added, and no particularly critical value or range can be stated. As a rough guide for the plastic/pigment ratio, a weight ratio of approximately 1:1 to 1:12, in particular 1:3 to 1:8, more preferably approximately 1:4 to 1:7, is indicated.

The main component of the plastic-bonded transfer coating layer of the transfer tape according to the invention is a soluble cellulose derivative as a release aid. Only through the use of such a release aid can a clean release be achieved under conditions of tensile stress when applying the transfer coating to the support. Particularly preferred cellulose derivatives are cellulose ethers soluble in organic solvents and/or water, such as methyl, ethyl, hydroxyethyl, ethylhydroxyethyl and carboxymethylcellulose; cellulose esters,
Examples are cellulose acetate, acetobutyrate and propionate. However, many other soluble cellulose derivatives are also suitable and achieve the desired effect. The cellulose basic structure in the soluble cellulose derivatives is important, and introduced groups such as ethyl groups result in derivatives that are soluble in particularly selected solvents.

The amount of cellulose derivative added to the transfer coating layer is not critical and depends on the nature of the plastic, pigment and other additives added. In particular, about
Amounts of 1.5 to 3.5% by weight are advantageous. A range of about 2-2.5% by weight is even more advantageous. These values relate to dry matter. The quantity ratio of cellulose derivative to plastic can also be used as a basis for the composition of the transfer coating layer. As a rough guide, the ratio of cellulose derivative to plastic is approximately 1:2 to
1:20, especially about 1:4 to 1:10.

Further additives can be added to the transfer coating layer to control the application method and properties of the transfer coating layer applied to the support. This is especially true of hiding power improvers such as aluminosilicates, colorants such as carbon black, e.g. Ciba
Said lakes of basic dyes, especially in the form of gallic acid derivatives, such as Geigy's Printan.

The materials of the individual coatings of the transfer tapes of the invention are generally defined by the adhesion tension between the pressure-sensitive adhesive coating and the transfer coating layer [work of adhesion corresponding to the Giuplet equation (KLWolf “Physik und Chemie
Springer Velag 1957, p164
)] is higher than the adhesion tension between the support material and the transfer coating layer. If, in special cases, this is not fulfilled, a suitable anti-adhesive agent must be applied to the support material in order to fulfill this basic requirement. In such cases, another requirement is taken into account, that the transfer coating formed on the support is non-adhesive to other materials, in particular to the paper with which it comes in contact. The transfer tape of the invention can then be used effectively with the following adhesion tension conditions, where the symbol S is the adhesion tension ratio between the various materials, i.e. S ₁ is the paper/pressure-sensitive adhesive coating, S ₂ is the adhesion tension ratio between the various materials. Transfer coating layer/pressure-sensitive adhesive coating, S ₃ is transfer coating layer support material, S ₄
is the ratio of transfer coating layer/paper, S ₅ is the ratio of pressure-sensitive adhesive coating layer/support material, the following requirements are taken into account: S ₁ is higher than S ₃ , S ₂ is higher than S ₃ , S ₅ is higher than S ₂ , and S ₅ is smaller than S ₃ . Furthermore, the free surface of the transfer coating applied to the substrate, in particular paper, must have no outward adhesion, ie S ₄ is zero or close to zero. In other words, the applied transfer coating layer should not be tacky on contact with the hand or paper.

A feature of the advantageous process for producing the transfer tapes of the invention is that a suitable plastics solution containing said cellulose derivatives is applied in a customary manner, for example with a doctor blade, to a support in the form of a flexible film, and the solvent is enriched. The aqueous dispersion containing the pressure-sensitive adhesive is then applied to the formed plastic bond transfer coating layer by conventional application methods such as a doctor blade or roll coater, followed by evaporation of the water. It is to let.

When using the transfer tape according to the invention, it is advantageous to use commercially available applicators which are capable of roll-transferring the transfer coating layer with the pressure-sensitive adhesive and simultaneously winding up the support material. The transfer tape according to the invention is thereby particularly easy to handle. The applicator is formed by a commercially available manual instrument. A particularly suitable device of this type is a so-called hand roller, in which a supply spool wrapped with transfer ribbon is arranged in an easily grippable casing, the ribbon being led out from an applicator leg projecting from the casing, and from which the casing It is rewound onto the take-up spool inside. Appropriate gearing between the spools within the casing ensures that the transfer ribbon is properly tensioned at all times. To use a transfer ribbon, the user picks up the casing and attaches the outer peelable transfer coating layer to the support material to be transferred (e.g. for making modifications), which is passed over the end edge by the applicator leg. (typed paper sheet). During crimping, the user moves the instrument relative to the substrate, thereby transferring, for example, an opaque or fluorescent coating layer to the support, and the flexible support being unwound from a supply spool and onto a take-up spool. It is wound up.

The transfer tape of the present invention is particularly suitable for use as a correction means for the purpose of concealing and correcting erroneously typed letters, markings and drawings in offices, schools and homes. Another use of transfer tapes is the colored marking of surfaces, documents or signs or the like, the transfer ribbon having a transfer coating layer containing colored pigments. Another use is the explanation and emphasis of text points, symbols or drawings. For this purpose, the transfer coating layer is particularly transparent and colored with a daylight fluorescent colorant. In all the applications mentioned here, it is applied dry, ie without smearing of liquid films and evaporation of harmful solvents, so that immediate retyping is particularly advantageous. Thus, according to the transfer tape of the present invention, for example, a concealing coating layer can be applied easily, quickly and uniformly to a support material. If the transfer coating layer of the transfer tape according to the invention is transparent, i.e. does not contain coating pigments, for example, it can be used for mere concealment without any coloring effect and for the preservation or protection of prints that are sensitive to effects such as air. can.

Example: The invention will now be explained by way of example.

Example 1: To form a colorant-containing transfer coating layer, the following dispersion is first prepared: Solvent-soluble polyurethane (Permuthane)
U4924) (25% in isopropyl alcohol/toluene mixing ratio 1:1) 19.0 parts by weight Isopropanol 10.0 parts by weight Toluene 35.0 parts by weight Lake (Printan G) 1.0 parts by weight Ethylcellulose N7 (peeling aid) 1.0 parts by weight Titanium dioxide (Kronos RN34) 29.0 parts by weight Aluminosilicate P820 (hiding power improver)
5.0 parts by weight Carbon Black (Printax 140V) (colorant)
0.01 parts by weight 100.01 parts by weight The above coating was applied to the silicone-coated paper support by means of a doctor blade in an amount of 18 g/m ² . The solvent was then evaporated by passing hot air at about 100°C. An aqueous dispersion having the following composition was applied to the surface of the colorant-containing hiding coating layer using a doctor blade: Acrylate pressure-sensitive adhesive (Freihoff's plastic dispersion VP859/6) (acrylic ester copolymer) 66.9wt. Part water 33.0 parts by weight Wetting agent or surfactant (Byk W) 0.1 parts by weight 100.0 parts by weight The pressure-sensitive adhesive was applied with a doctor blade to a thickness of 2 g/m ² . The moisture was then evaporated by passing hot air at about 100°C.

The resulting transfer tape was particularly suitable for concealing typed characters on paper. The coating strip could be applied quickly and evenly and immediately retyped over. Application was carried out using a commercially available hand roller.

Example 2: Modifying Example 1, the following formulation was used to form a colorant-containing transfer coating: Polyurethane (Desmolac 2100 from Bayer)
5.0 parts by weight Methyl ethyl ketone 30.0 parts by weight Toluene 28.6 parts by weight Maxilonbrillantflavin 10GFF (BASF)
1.0 parts by weight Basonyl-Rot 540 (BASF) 0.4 parts by weight Titanium dioxide (RN34 from Kronos) 29.0 parts by weight Aluminosilicate P820 (Degussa) 5.0 parts by weight Ethylcellulose N7 (Hercules) 1.0 parts by weight Transfer obtained The transfer coating layer of the tape had good hiding power and was colored (orange) and showed no fluorescence.

Example 3: Modifying Example 1, the following formulation was used to form a colorant-containing transfer coating: Linear saturated polyester (from Good Year)
VitelPE 700) 4.0 parts by weight Methyl ethyl ketone 30.0 parts by weight Toluene 31.0 parts by weight White pigment (zinc sulfide) (Sachtolith L from Sachtleben GmbH) 25.0 parts by weight Ethylcellulose N7 (Hercules) 1.0 parts by weight Blaze Orange T15 (Dayglo) 9.0 parts by weight Obtained The transfer coating layer of the transferred transfer tape had good hiding power and was colored (orange) and fluorescent.

Example 4: Modifying Example 1, the following formulation was used to form the colorant-containing transfer coating layer: Styrene-isoprene-styrene copolymer (Cariplex TR 1107 from Shell) 4.7 parts by weight Methyl ethyl ketone 42.0 parts by weight Toluene 42.0 parts by weight Redglo Soluble Toner GF13 (Redglo)
8.0 parts by weight Ethyl cellulose N22 (Hercules) 1.0 parts by weight Aluminum stearate Alugel TH34
0.8 parts by weight Silicic acid (Aerosil 200 from Degussa) 1.0 parts by weight The transfer coating layer of the resulting transfer tape was transparent and colored (orange).

Example 5: Modifying Example 1, the following formulation was used to form a colorant-containing transfer coating layer: Vinyl propionate-based polymer dispersion (Propionfan 6D from BASF) 20.0 parts by weight of titanium dioxide ( RNCX from Kronos) 30.0 parts aluminosilicate P820 5.0 parts water 28.5 parts water-soluble methylcellulose (from Wolff & Co.
Walocel MW50GB) 1.0 parts by weight Isopropanol 14.0 parts by weight Silicone-free aqueous solution of halogenated organic compounds (foam suppressor SF from Ho¨chst AG)
1.0 parts by weight Sodium dioctyl sulfosuccinate (Lutensit ABO/BASF wetting agent)
0.5 parts by weight The transfer coating layer of the resulting transfer tape had good hiding power and was white in color.

Claims (1)

[Scope of Claims] 1 A support material and a pressure-sensitive adhesive coating, wherein a plastic-bonded transfer coating layer is disposed between the support material and the pressure-sensitive adhesive coating, and the plastic-bonded transfer coating layer provides support to the pressure-sensitive adhesive coating. In a flexible multilayer transfer tape that has a stronger adhesion to the material, the plastic-bonded transfer coating layer contains a soluble cellulose derivative, which is present in the transfer coating layer in an amount of 0.5 to
Flexible multilayer transfer tape for correction and marking, characterized in that it is present in an amount of 5% by weight. 2. The transfer tape according to claim 1, wherein the cellulose derivative is ethyl cellulose. 3. A transfer tape according to claim 1 or 2, wherein the support material comprises plastic or silicone coated paper or both. 4. Any one of claims 1 to 3, wherein the transfer coating layer contains polyurethane as a plastic binder.
Transfer tape as described in section. 5. The transfer tape according to claim 4, wherein the polyurethane is an aliphatic one-component polyurethane. 6. Transfer tape according to any one of claims 1 to 5, wherein a colorant is present in the transfer coating layer. 7. The transfer tape according to claim 6, wherein the colorant is a pigment. 8. Claim 7, wherein the pigment is a white pigment with high hiding power.
Transfer tape as described. 9. The transfer tape according to claim 7, wherein the pigment is an organic or inorganic colored pigment. 10. The transfer tape according to claim 6, wherein the coloring agent is a fluorescent dye to emphasize the display of text characters or figures. 11. If a basic dye is added, the transfer coating layer comprises a lake for this dye.
The transfer tape according to any one of the preceding items. 12. The transfer tape according to any one of claims 1 to 11, wherein the ratio of the thicknesses of the pressure sensitive adhesive coating and the transfer coating layer is from 1:4 to 1:12. 13. The transfer tape of claim 1 in the form of a roll in a hand-held instrument. 14 A plastic solution containing a soluble cellulose derivative is applied to a flexible support by a conventional applicator, the solvent is evaporated at elevated temperature, and an aqueous dispersion containing a pressure-sensitive adhesive is then formed to form a transfer coating layer. A process for the preparation of a flexible multilayer transfer tape for correction and marking, characterized in that it is applied by a conventional applicator to a surface and then the water is evaporated.