Coating processes – Restoring or repairing
Patent
1998-07-21
2000-12-19
Cameron, Erma
Coating processes
Restoring or repairing
427155, 4272088, 4274123, 4274124, 4274125, B05D 500
Patent
active
061624926
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention concerns a multi-layer correction material based on a siliconized carrier foil, which can be produced without the use of organic solvents or suspension agents as well as a process for its production and its use.
The covering over of mistakes in writing or typing or possible mistakes in drawings with pigmented liquid systems and typing or painting again, if need be, after drying is known. These systems, however, have the disadvantage that they frequently contain an easily volatile organic solvent, which leads to environmental pollution upon evaporating. With the use of aqueous systems, in fact, environmental pollution is avoided, but a prolonged drying time must be bargained with.
For this reason, multi-layer transfer tapes have been developed, in which a pigmented covering layer lying on a carrier is coated with a semi-adhesive layer. In this way, the multi-layer correction material with its semi-adhesive layer is positioned over the place to be corrected or covered up and pressure is exercised on the above-lying carrier. In this way, the semi-adhesive layer is pressed onto the paper and remains adhered to it. The covering layer is then stripped from the carrier, which is usually configured as a foil, so that the layer now adheres to the desired paper place and covers the writing lying underneath. DE-B 3,741,022 describes a multi-layer, flexible transfer tape with a carrier foil, in which the stripping behavior of the covering layer is improved by the addition of cellulose derivatives, so that the covering layer bound to the plastic carrier is easily stripped upon application. In the production of this correction tape, however, organic solvent and dispersing agents such as isopropyl alcohol and toluene are used.
DE-A-4, 129,413 describes the production of a multi-layer correction material, which can be produced without application of organic solvents and without the co-use of cellulose derivatives that promote stripping. This is achieved by a special structure of the coating agent forming the covering layer and an adaptation with an overcoat coating responsible for the adhesion. An aqueous overcoat coating is applied onto the dried covering layer, and this overcoat contains a polyethylene wax dispersion, an anionic polyacrylate dispersion, and, if necessary, an emulsifier, as well as other common additives.
The invention now has the objective of offering a multi-layer correction material, particularly in the form of a rolled-up tape of the type initially described, which can be produced without the use of organic solvents, i.e., which can be prepared in aqueous solution or suspension alone. Another objective of the invention is to offer such a transfer or correction means, which does not require a stripping agent as an additive. Finally, it is another objective of the invention to dispense with an overcoat, which contains a wax dispersion.
The above-named objectives are achieved according to the invention with a correction and/or marking agent, which has a film that can be inscribed and stripped off that is arranged on a carrier, which is coated with an adhesive, [an agent, which] is characterized by the fact that the inscribable film or covering layer has a film-forming binding agent and a friable binding agent at room temperature. As a friable binding agent, those binding agents may also be used, which initially have film-forming properties, but form a friable compound together with the other additives, particularly with pigments.
It has been shown according to the invention both that good stripping properties can be achieved with such a structured covering film, and that the use of organic solvents as well as an overcoat containing wax can be omitted.
Film-forming binding agents are, for example, terpolymer dispersions based on vinyl acetate and acrylic acid esters, such as are marketed under the tradename Macrovil 21 2 G of Indulor Chemie GmbH, 49572 Ankum, Germany. Another film-forming binding agent that can be used according to the invention is, for example, [the group of]
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Cameron Erma
Citius Burotechnik GmbH
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