DE3020380A1 - Fluid e.g. ink eradicator dispensing material - consisting of moisture conductive e.g. alpha-cellulose fibres embedded in gelled plastisol - Google Patents

Abstract

New material contg. and releasing at least 1 active substance consists of a gelled plastisol to which moisture-conducting fibres and the active substance(s) have been added prior to gelling. The material can be used e.g. for the prodn. of non-inking stamps, as a dispenser for the hardening component of 2- component adhesives, as a carrier for ink-eradicating substances (e.g. sulphite solns.), or as a carrier for other liquid or pasty materials such as cleaning fluids, insecticides, perfumes, cosmetics, fertilisers, disinfectants or medicines. The material gives gradual and uniform release of the active substance(s) and is not subject to rapid drying out when left exposed to the atmosphere.

Description

Material containing active ingredients, method for

Its manufacture and its use The invention relates to a at least one active ingredient containing and releasing material. Still concerned they deal with a method for making this material as well as a preferred one Possible uses for the material.

There are different ways to store and release active ingredients. For example, liquids can be stored in containers and by appropriate openings are released. Of course, this procedure only makes sense if it is about storing larger amounts.

Another known possibility is to use any active ingredients to be stored in sponge-like plastics. This procedure has primary the disadvantage that only liquid substances can be stored. Disadvantageous It is also the case that the substances to be stored are only subsequently applied to the Plastic material can be applied, which is an additional operation conditional. In addition, there is a risk of the active ingredients escaping prematurely. It should also be noted that often even with a relatively minor mechanical Relative stress on the spongy plastic a lot of active ingredient is released, which is then lost. Finally also takes place the release of the active ingredients is uncontrolled, so that fine dosing is ruled out appears.

The invention is now based on the object of a novel material to create which does not have the above-mentioned deficiencies, i.e. is able to take up the active ingredients in a simple way, but at the same time a light and dosed one Release of the active ingredients is permitted without the need for rapid drying or the like. of the active ingredients is to be expected, whereby the material should also be able to to be used for a variety of areas of application.

In addition, the aim of the invention is to propose a method with which the new material can be found in a simple way, but nevertheless with particularly good performance properties can be produced.

According to the invention, an active ingredient is used to achieve the above-mentioned object Proposed containing and releasing material that consists of a gelled plastisol consists, the moisture-conducting fibers before gelling and the at least one Active ingredient are added.

The main difference compared to the procedure according to the invention the well-known, sponge-like plastics can therefore be seen in the fact that the to storing active ingredient directly into the main component of the material Plastic is incorporated. In this way, a variety of benefits can be found reach. It is particularly important that the dosage of the active ingredients is very precise is possible because it is incorporated into the raw plastic material. Because the active ingredient through the plastic material is completely enclosed is that Compared to known substances, the shelf life of the material is very good, without that the effectiveness of the stored active ingredients would be considerably impaired. Nevertheless, the active ingredients cannot be transported to the surface of the material Difficulties are possible, as the fibers that conduct moisture cause ducts or Pores are formed. Finally, the incorporated active ingredients can be targeted and are dispensed in a precisely dosed manner, namely in different ways, namely either by applying appropriate pressure or by slowly evaporating the stored active ingredients1 whereby the air humidity may be sufficient for this purpose, or finally by dissolving the active ingredients from the plastic material by means of Appropriate solvents, especially with the help of water.

Good moisture conduction is obtained if, as in accordance with the invention proposed that the moisture-conducting fibers of textile fibers and / or pure OL cellulose are formed, the fibers preferably having a length of 0.03 to 0.2 mm.

The shelf life and the release of the active ingredients may vary.

can be improved by adding humectants, whereby Glycerine, glycols or hygroscopic inorganic salts serve as humectants. The hygroscopic inorganic salts are e.g. phosphates, hydrogen phosphates, sulfates and formates of potassium, sodium and the corresponding ammonium salts in question.

Especially with such materials, in which the release of the active ingredients should take place under the application of pressure, it is favorable if a proportionate high plasticizer content is contained in the material, namely one of at least 40, preferably at least 50%.

There is one method for making the material of the invention particularly suitable, which is characterized by the fact that the fibers, active ingredients and possibly additives in a plastisol made of plasticizers and polyvinyl chloride or

a polyvinyl chloride-polyvinyl ethylene mixture are incorporated, that the paste thus obtained is then placed in molds and at about 120 to 180 OC is gelled, and that finally the gelled parts in an organic Solvents can be made to swell slightly on the surface. This manufacturing process can be carried out very easily and with cheap means. The superficial one Swelling of the parts has the advantage that an activation takes place as it were, i.e. the release of the active ingredients is favored.

A particularly even distribution of the active ingredients, fibers and Additions are achieved when the paste is made during the production of the material Plastisol, fibers, active ingredients and possibly additives after a swelling time of about 12 hours and before being put into the molds is mixed again.

The swelling is advantageously carried out so that the gelled Parts about 1 hour in a mixture of acetone and water in the ratio 1: 3 or from ethyl acetate and ethanol in a ratio of 1: 4.

In a procedure according to the invention, a material is obtained which, As the above list of advantages shows, for a variety of application areas can be used. Just for example please note the following possible uses: Stamp without Ink pads that may contain a dye that can be used certain reaction partners, e.g. the commercially available ink erasing pens, are recolored can be. Also stamps made of a mass according to the invention with non-planar Stamp surfaces are generated, which are therefore suitable for very specific, special areas of application are suitable.

It would also be conceivable to relate the material according to the invention to use with the gluing by means of two component adhesives, then for example the material according to the invention would contain the hardener. It could then be the hardener only be applied selectively, so that only in the area that is in with the mass Connection came, the adhesive hardened.

A wide field of application of the material according to the invention is as Carrier material for all possible liquid or pasty agents, e.g. for cleaning fluids, for substances that act as insect repellants or fragrance dispensers, for cosmetics, for Fertilizers - in this case a precisely dosed fertilizer delivery, possibly over a longer period of time, would be possible - for disinfectants, even for medical ones Active ingredients, for example as a plaster or swab, in the latter case the advantage of a slow and even release of the medicinal substance huber can achieve a longer period of time, which has previously been the case, for example, when using Overdosing observed with ointments can be avoided.

It goes without saying that the above list is not exhaustive. particularly However, it is advantageous if, as is further provided according to the invention, the Material according to the invention for the removal or decomposition of the end Sulphite solutions formed ink extinguishers od after their application on paper. Like. Font carrier is used. With this use of the material after On the one hand, the invention has the advantage that after the active substance has been released Depending on the material, the sulfite solution used to bleach the ink does not work can develop more, i.e. a renewed overwriting with the originally deleted Ink is possible. At the same time, when applying the active ingredient by means of the Material, for which the material must be pressed against the writing surface, this base is smoothed, so that it can be overwritten without any problems.

In this type of use, the material contains active ingredients advantageously organic acids, acidic salts and / or oxidizing agents. as Organic acids can conveniently be tartaric acid, citric acid or benzenesulfonic acid be included in the material. The acidic salts are preferably NH4Cl, Ca1, KHSO, (NH4) HSO4, NH4SCN or ammonium alum are possible. Particularly favorable oxidizing agents for use in the material according to the invention are NaI or SnCl2.

To simplify the use of the material in conjunction with According to the invention, ink extinguishers are further proposed that from the material a molded body is formed and this is attached to an ink eraser pen that in a manner known per se, a memory and an applicator tip for the ink extinguishing agent having. The molded body can advantageously be at the closed end of a cover cap be attached for the application tip for the ink extinguisher. in this case the shaped body is fastened in a simple manner such that the Moldings a projection protruding into a self-contained recess in the cover cap having. This definition in a recess of the cap also has the advantage that in the area of the recess the surface of the molded body, as it were is closed, thus a release of active ingredients contained in the molded body in this area is not possible.

Finally, it is within the scope of the invention that when using of the material in conjunction with an ink eraser pen, the active ingredients and / or additives of the material forming the shaped body onto that contained in the ink eraser pen Ink extinguishers are matched.

Further features, details and advantages of the invention result can be derived from the following explanation of possible compositions for the material and description of an ink eraser pen shown partially in section in the drawing, which is equipped with the material according to the invention.

The examples below pay particular attention to the use of the material in connection with ink extinguishers. The composition the material can of course be varied to adapt to other areas of application will.

As is known, most ink erasers essentially consist from sulfite solutions. The use of ink erase pens with such means has the disadvantage that the deleted places are not correctly overwritten can. On the one hand, the sulfite solutions destroy the structure of the paper. In the included in the solutions Alkali components as well as wetting agents and humectants moreover remain essentially on even after complete evaporation of the water-based ink extinguishing agent in the paper. You then overwrite with fountain pen inks based on erasable triarylmethane dyes there is no visible smear. If non-erasable ink dyes are used, color changes are often observed. Another major flaw can be seen in the fact that the writing runs very strongly when overwriting, so a sharp typeface can no longer be achieved.

If a material according to the invention is now used, which acids contains or oxidizing agent, 50 is the remaining sulfite on the paper decomposed by these active ingredients, so that color changes or fading of the Ink is no longer expected. In addition, by applying the active ingredients in the material, which takes place by pressing the material against the base, the paper that may have been roughened during the deletion process is also smoothed, which means the quality of the correction can also be improved.

A material for use in conjunction with ink sealants can be For example, build on the following basic recipe that results in a material which a perfect dabbing and smoothing of the writing support is permitted: basic recipe Plasticizers, e.g. PalatinolX AH (BASF) 52.8% stabilizer for PVC, NuostabO (BASF) 2.0% color paste for PVC 0.7% urea 1.0 g PVC powder 33.5% oC cellulose fibers 10.0% 100.0% This basic recipe is then supplemented by additional Reactant supplements, which decompose the excess ink erasing fluid to lead. Possible reactants are, for example: a) 10-20% tartaric acid b) 10% (NH4) HS04 5% glycerine c) 5% (NH4) SCN d) 2% SnCl2 2% glycerine For production of the material based on the above-mentioned basic recipe with the addition of additives, possibly - for special areas of application - even without the additives, is as follows proceeded: The various components that make up the material are mixed very thoroughly with a dissolver. Then you leave the mixture sources. After about 12 hours of swelling time, the mixture is mixed and degassed again.

The paste thus obtained is then poured into aluminum molds and gelled for 10 minutes at a temperature of 120 to 140.degree. C., the layer height should be about 1 cm. After cooling, it is removed from the mold. The parts thus obtained are then about 1 hour in a mixture of acetone and water in a ratio of 1: 3 or stored from ethyl acetate and sthanol in a ratio of 1: 4, increasing the effectiveness the material is improved.

It goes without saying that the aforementioned recipe can be changed if necessary can be. In particular, instead of the above mentioned additives other additives of the type mentioned at the outset can also be used. The finding the particularly suitable additives in each case present no difficulties for the person skilled in the art, In the drawing, an ink eraser is now shown, which with a molded body is provided from the material according to the invention.

The ink eraser pen shown comprises in a manner known per se a shaft 1 containing two ink reservoirs, not shown. The one ink reservoir communicates with a first tip 2. For example, it contains a non-erasable one Ink. The other reservoir in the shaft 1 is connected to the second tip 3. It contains an ink erasing agent, which by means of the tip 3 on the to be erased Lettering can be applied.

The tip 2 is largely airtight with a first cover cap 4 lockable. To cover the second, used to apply the ink extinguishing agent Tip 3 serves a cap 5.

The cap 5 is provided with a recess 7 at its free end 6. In this recess 7, a projection 8 of a molded body designated as a whole with 9 protrudes from the material according to the invention. The approach 8 has a opposite exposed end 10 of the molded body 9 slightly reduced cross-section. The molded body 9 can be glued into the recess 7. Usually enough it is, however, to use it in a press fit, which is possible without difficulty because the molded body 9 is generally elastic due to the special material used is compressible.

The material for the molded body 9 can, for example, according to the above The basic recipe listed must be prepared with one of the additives mentioned.

When using the eraser pen shown in the drawing to correct, first use the second tip 3 to apply the ink extinguishing agent to the to be removed part of a lettering applied. After a certain exposure of the ink extinguisher is then the appropriate place with the help of the free end 10 of the shaped body 9 dabbed off.

During this dabbing, the shaped body releases active ingredients in the desired manner which neutralizes any residues of the sulfite solution that may still be present. Simultaneously when dabbed, the writing surface, which may be caused by the ink-extinguishing agent or the brushing over with the tip 3 was roughened, smoothed. Direct after dabbing by means of the shaped body 9, the corrected point can then be overwritten either the first tip 2 of the eraser pen is used for this purpose or the fountain pen already used for the original font.

Especially when using the normally used fountain pen a correction can be achieved that is found only with difficulty can be.

With an appropriate choice of the active ingredients in the shaped body 9, the expedient Need to be matched to the ink extinguisher could be on the first tip 2 for the application of non-erasable ink can of course be dispensed with.

Claims (18)

Claims: 1. At least one active ingredient containing and releasing Material consisting of a gelled plastisol that absorbs moisture before gelling conductive fibers and the at least one active ingredient are added. 2. Material according to claim 1, characterized in that the Moisture-conducting fibers made of textile fibers and / or an ffi -cellulose are. 3. Material according to claim 1 or 2, characterized in that the the moisture conducting fibers are 0.03 to 0.2 mm long. 4. Material according to one of the preceding claims, characterized by adding humectants. 5. Material according to claim 4, characterized in that as a humectant Glycerine, glycols or hygroscopic inorganic salts are used. 6. Material according to one of the preceding claims, characterized by a plasticizer content of at least 40, preferably at least 50%. 7. A method for producing the material according to any one of the preceding Claims, characterized in that the fibers, active ingredients and possibly additives in a plastisol made of plasticizers and polyvinyl chloride or a polyvinyl chloride-polyvinyl ethylene mixture are incorporated, that the paste thus obtained is then placed in molds and at about 120 to 180 OC is gelled, and that finally the gelled parts in an organic Solvents are made to swell slightly on the surface. 8. The method according to claim 7, characterized in that the paste of plastisol, fibers, active ingredients and possibly additives after a swelling time of about 12 hours and before it is mixed again in the molds. 9. The method according to claim 7 or 8, characterized in that the gelled parts for about 1 hour in a mixture of acetone and water in the ratio 1: 3 or from ethyl acetate and ethanol in a ratio of 1: 4. 10. Use of the material according to any one of claims 1 to 6 for Elimination or decomposition of ink extinguishers formed from sulphite solutions after they have been applied to paper or the like. 11. Use according to claim 10, characterized in that as Active ingredients in the material organic acids, acidic salts and / or oxidizing agents are included. 12. Use according to claim 11, that as organic acids in the material Tartaric acid, citric acid or benzenesulfonic acid are included. 13. Use according to claim 11, characterized in that as acidic salts in the material NH4Cl, CaCl2, KHSO4, (NH4) SSO4, NH4SCN or ammonium alum are included. 14. Use according to claim 11, characterized in that as Oxidizing agents are contained in the material NaI or SnCl2. 15. Use according to one of claims 10 to 14, characterized in that that a molded body is formed from the material and this is attached to an ink eraser is attached, the tip in a known manner a memory and an order for the ink extinguisher. 16. Use according to claim 15, characterized in that the Molded body at the closed end of a cap for the application tip for the Ink extinguisher is attached. 17. Use according to claim 15 and 16, characterized in that of the shaped bodies protruding into a self-contained recess in the cover cap Has approach. 18. Use according to one of claims 15 to 17, characterized in that that the active ingredients and / or additives of the material forming the shaped body the ink eraser contained in the ink eraser pen are matched.