DE3247804C2 - - Google Patents

Description

The invention relates to a Colorless dye / developer system ink containing a deep, clear handwriting, and a extinguisher, which easily delete the handwritten in this ink can. Furthermore, the invention relates their use in one Salt of a writing utensil.

So far, various methods have been used for deleting developed with ink written handwritten. For example There is a method (1) that uses ink Handwritten using a slightly bleachable dye is cleared with the help of a bleach, and a method (2) in which a dye is converted into a rubbery, incorporated high molecular weight material is, the material obtained in a solvent for Production of ink is solved and with this ink Handwritten with the help of a rubber extinguisher erased becomes. However, these methods have the following Disadvantage. In method (1), traces of erased tend to be Ink marks for yellowing, and the stability of the Bleaching agent becomes poor over time. In the method (2), since the viscosity of the ink is greatly increased, the use of a pressure-tight ballpoint pen structure  required, and further, it is believed that the erasing power is not satisfactory.

There was also a writing method using a recommended reversible reaction in which the color development by electron transfer between a developer with a phenolic hydroxyl group and a colorless, Electron-providing organic compound (colorless Dye), which by the action of the developer a color developed, brought about and this by the electron transfer caused color development by a desensitizer consisting of a polar compound is inhibited, whereby the dyed dye made colorless becomes. For example, in JA-AS 21 649/1973 discloses a writing material consisting of a dye (colorless dye) with a developer component Structure in the molecule, a compound (developer) with an acidic hydroxyl group in the molecule and a polar one Solvent (desensitizer) exists. This Writing material is said to give an ink for special purposes, which is colorless immediately before writing and by Evaporate the solvent after writing one visible handwriting results. Since the manuscript at the time of writing is not recognizable, this is Writing material as an ink for ordinary writing utensils not suitable. Furthermore, in the JA-AS 48 085/1976 a Colorant for writing utensils disclosed that from a Electron-providing organic compound (colorless Dye), a compound with a phenolic Hydroxyl group (developer) and a nonvolatile compound (Desensitizer), which is the color development reaction desensitized between the two compounds, consists. Handwritten with such a coloring agent is colored immediately after writing. however  will, if the developer in this handwritten through Heating is evaporated or washed away by water, the handwritten colorless or discolored. Such Extinguishing technology is compared to the means that one Use rubber degreaser or an extinguishing liquid, not easy. Thus, the colorant is for use as erasable ink for usual writing utensils not suitable. Furthermore, no stable, fast handwriting be achieved, which neither to discoloration nor to Discoloration over time, as with ordinary ink, suffers.

Textile Report 1975 (T 1745/75) discloses chromogenic fluoran dyes bekanant who in contact with phenol-formaldehyde resins develop a deep color. Furthermore, from the DE-OS 23 27 723 thermochromatic materials known for the formation of an ink for Scheibutensilien. One with made of such an ink changed with the Temperature their color and ultimately holds no discoloration still decolorization stood.

The aim of the invention is in contrast, a new ink and to create a new extinguisher, through which a stronger and Clearer writing can be achieved than with a pencil and this font according to the requirements to simple Way can be deleted.

Here, the ink should give a stable and fast font, neither discoloration nor discoloration in the course the time, like those written with ordinary ink Scripture is subject and the extinguisher simple and complete delete the font written with this ink.

It has now been found that when writing using the colorant defined below, which is a developer with a phenolic  Hydroxyl group and an electron donating colorless dye, which is responsible for color development by acting the developer is capable of working in a solvent that is the color development reaction between the developer and the colorless dye are not inhibited, includes, a strong and clear font, similar which can be written with ordinary ink, can be achieved. In this writing you have neither on the desensitizer discouraging discoloration still fear discoloration, because this ink is not desensitizing, polar Contains compounds, d. H. Desensitizers that the make developed dye colorless. The ones with this ink written writing can be easy and complete with Help of a extinguisher, which is a desensitizing, polar Connection includes, be deleted.

The invention thus an ink consisting of

• a) a dye obtained by reacting from 1 to 40 Wt .-% of a colorless dye precursor of the type Crystal Violet Lactone, Malachite Green Lactone or 3-dimethylamino-6-methoxyfluoran, 3,6-diethoxyfluoran, 1,2-benzo-6-diäthylaminofluoran, 2-anilino-3-methyl-6-pyrrolidono-fluoran, 3 ', 6'-bis (diethylamino) -spiro- (phthalan-1,9'-xanthine) and 1,1-bis (p-aminophenyl) phthalan or Di-β-naphthospiropyran, xantho-β-naphthospiropyran or Benzo-β-naphthoisopiropyran with a phenolic resin Novolak type developer was obtained,
• b) 25 to 50 wt .-% of a solvent from the series of the aromatic alcohols or ethylene glycol monophenyl ether and optionally one or more of the following components c), d) and / or e):
• c) 0.1 to 20 wt .-% of at least one Zn, Al, Sn or Ni salt of an aromatic carboxylic acid,  
• d) 0.2 to 30 wt .-% of a phosphite triester, which differs from Derive alcohols with 5 or more carbon atoms,
• e) lubricity and viscosity increasing agents,

where the percentages are based on the total amount of ink are related.

Another object of the invention is a quencher for Records and fonts with this ink consisting of

• a) 2 to 40 wt .-% of a polar compound, at ordinary temperature, in molten Condition shows a desensitizing effect and ink can erase but does not solidify any desensitizing Effect shows more when the solvent evaporated is, however, with a melting point of 60 ° C or higher a vapor pressure of 133.3 Pa or lower at 150 ° C or one Boiling point of 320 ° C or higher, out of line Diphenyl phthalate, diphenyl urethane, pentaerythritol tetraacetate, pentaerythritol tetrabenzoate, diphenylglycolic acid, Ethylene glycol dibenzoate, N-phenyl-β-naphthylamine, Phenyl N-phenylanthranilate, methyl N-phenylanthranilate, Benzoguanamine, 4,4'-methylene-bis- (acetanilide), 4,4'-sulfonyl-bis- (acetanilide), p-aminoacetanilide, Benzoacetin, 4-butoxy-N-hydroxybenzene-acetamide, 2,3- Dihydro-2,2-dimethyl-7-benzofuranol methylcarbamate, cotoine, Diaminodiphenylmethane, dianisidine, 4- (phenylmethylphenol) - carbamate, galactitol, diphenyl phthalate, 4 '- (ethylsulfamoyl) - sulfanilylanilide, 4,4'-tetramethyldiaminodiphenylmethane, Polyvinylpyrrolidone, polyvinylacetate, N-vinylpyrrolidone / Vinyl acetate copolymers, ketone resins, oligo-N- methylmorpholinium propylene oxide, polyacrylates, polymethacrylates, Polyester, urea / formaldehyde resins, ethylene urea / Formaldehyde resins, ethylene urea / butyraldehyde Resins, poly-N-butoxymethyl-acrylamide and vinyl acetate / Maleic acid copolymers and
• b) volatile solvents at 160 ° C or below boil.

The use of novolak-type phenolic resin as a developer and an aromatic alcohol and / or ethylene glycol monophenyl ether as a solvent in the inventive Ink allows you to get a stable and fast font, no discoloration nor discoloration on exposure on outdoor conditions, such as heat, light, water, etc., in particular after writing, subject.

By using a desensitizing solution polar compound of low volatility in a volatile Solvents having a boiling point not higher than 160 ° C - the polar compound at ordinary temperature is a solid and has a melting point of 60 ° C or higher, but with a vapor pressure of 133.3 Pa or lower at 150 ° C, the extinguisher may have a reappearance of the extinguished Inhibit writing and allow it to be deleted Surfaces with the same ink immediately after Delete can be described again.

The invention further relates to the use of a set of a Ink and an eraser for the ink as above defined in a sentence of a writing utensil and a deletion utensil. This writing utensil consists of a first sleeve, an ink tank disposed in the first sleeve, an ink flow part for the supply of the ink the ink tank to the top or the end of the first sleeve and from a writing tip at the end of the ink flow part  is arranged. The extinguishing tool consists from a second sleeve, an extinguishing liquid tank, the is arranged in the second sleeve, a porous passage part for the supply of the extinguishing liquid from the Extinguishing fluid tank to the end of the second sleeve and a quenching liquid application part that is formed by protruding the porous passage part from the end the second sleeve.

The writing utensil can be in the form of a writing utensil from the Marking pen type present. The ink flow part can constructed of a felt or fibrous wick can be, and the writing tip can stand out by the Tip can be formed from the end of the first sleeve.

Alternatively, the writing utensil may be in the form of a writing utensil of the ballpoint pen type. The ink flow part can be designed as a sleeve part, the is provided with a through hole, and the writing tip can be designed as a rotatable or rotatable writing ball which is embedded in the sleeve and partially protruding from the sleeve.

The sleeve of the writing utensil and the sleeve of the extinguishing tool may be formed as separate sleeves, however They can also be designed as a sleeve with  Help of a divider is divided into two divisions. In Such a case is within a department of Sleeve of the ink tank arranged and inside the other Department of the sleeve of extinguishing liquid tank provided.

The extinguishing tool may be a solid molded part that was prepared by uniformly dispersing Microcapsules in a solidifying agent matrix, solidifying the dispersion and its shape. In the microcapsules the extinguishing liquid is included as core material.

The invention will be described below with reference to FIG Drawings explained in more detail; it shows

Fig. 1 is a sectional view showing an embodiment of a writing utensil from the marking pen-type and representing a set of a writing utensil, and an erasing utensil,

FIGS. 2a and 2b are sectional views of another embodiment of the writing utensil from the pen-type, which is a set of a writing utensil, and an erasing utensil,

Fig. 3 is a sectional view showing an embodiment of an extinguishing utensil, which is a set of a writing utensil, and an erasing utensil,

FIGS. 4 and 5 are sectional views showing embodiments of a set of a writing utensil, and an erasing utensil show, in which the writing means and extinguishing agent are arranged opposite each other on both ends of the sleeve,

FIG. 6 is a perspective view showing another embodiment of an erase-utensil member consisting of a fixed molded part and illustrating a set of a writing utensil and a quenching utensil, and FIG

Figs. 7 and 8 are sectional views showing further embodiments of a set of a writing utensil and a quenching utensil in which the quenching member formed of a fixed molded part is disposed at the rear end of the writing utensil.

The writing ink used in the present invention can be made by contacting the developer and the electrons Organic compound (hereinafter referred to as "colorless Dyestuff "), for color development by The action of the developer is capable of being dissolved in the solvent solves that the color development reaction between the Developer and the colorless dye is not inhibited.

The ink from the so-called dye / developer system contains a developed by the action of the developer Color and, as with ordinary oily ink, strong colored. Thus, a strong and clear font can be achieved become. Furthermore, you have the writing no Discoloration still discoloration over time due to a Desensitizer worry because this ink no polar compounds, d. H. any desensitizers, contains, which make the dyed color colorless.

The novolak type phenol resin developer should be sufficient be non-volatile (preferably with a boiling point of  320 ° C or higher), so that the font does not match the Time discolored, and in the solvent have solubility. Of these materials can be any without special Restriction be used. As examples of at the Invention suitable developers may be mentioned alkylphenol Novolak resins and halogenated alkylphenol novolac resins. Such developers may be used alone or in admixture be used.

The preferred amount of colorless dye is about From 1 to about 40% by weight, based on the total amount of ink, from the viewpoint of concentration and solution stability the ink. The ratio of developer to colorless dye, from the point of view of color strength and color stability of the ink, preferably about 1: 3 until about 20: 1.

The solvents for the ink used in the invention are those who are the developer and the can dissolve colorless dye, however, the between do not inhibit this occurring color development reaction.

Subsequent investigations found that the shelf life the writing to a large extent by the stability of the in the typewritten font present developer is influenced and that phenolic resins of the novolac type in stable Shape in writing without being affected by external heat, light, Water etc. evaporated or removed and therefore a permanent font, their color density at the time of writing did not fade.

Since the solvents used in the ink of the invention are polar compounds, they possess a desensitizing Effect. Thus one would have thought that they had a color development reaction in the colorless dye / developer system would inhibit and therefore not as a solvent used for the ink  could become. However, these are polar solvents solvents effective for ink in the present invention. The reason why they are effective at the present Invention can be used, probably due to the fact that, since the phenolic resins of the novolak type and the colorless dye well in the aromatic alcohols and ethylene glycol monophenyl ether are dissolved and thereby the color development reaction is accelerated, the color development reaction priority against the desensitizing effect, the which have polar solvents expires. Because the colorless Dye and the developer in such solvents Well resolved, an ink can be used in more practical Respect good physical properties in which no precipitation of insoluble constituents in the The course of time must be feared.  

Examples of aromatic alcohols are benzyl alcohol, β-phenylethyl alcohol, 3-phenyl-1-propanol, 4-phenyl-2-butanol and methylphenylcarbinol. On the other hand, that's why Ethylene glycol monophenyl ether selected among the glycols and that which is desensitizing Effect is weaker than that of other glycols.

In a preferred embodiment of the above colorless dye / developer ink, d. h., which has a phenolic resin Novolac type developer using ink, For example, the preferred amount of colorless dye is about 10 to 30 wt .-%, based on the total amount of the ink, and is the preferred ratio of the phenolic resin developer from novolak type to colorless dye about 1: 3 to about 10: 1.

In the above embodiment of the phenolic resin Novolac-type colorless dye developers / Developer system can provide the resistance a fading and the authenticity or durability in the Exposure to sunlight for a long period of time be further improved by adding a Zn, Al, Sn or Ni salt aromatic carboxylic acid adds to the ink and dissolves it. As examples of metal salts of aromatic carboxylic acids can be those with at least one hydroxyl group to call at the aromatic ring. The metal salts of aromatic Carboxylic acids with the hydroxyl group in ortho Position are particularly preferred. Examples of aromatic Carboxylic acids are salicylic acid, 5-tert-butylsalicylic acid, 3-phenylsalicylic acid, 3-methyl-5-tert-butylsalicylic acid,  3,5-di-tert-butylsalicylic acid, 3,5-diamylsalicylic acid, 3-cyclohexylsalicylic acid, 3-methyl-5-isoamylsalicylic acid, 5-isoamylsalicylic acid, 3,5-di-sec. butylsalicylic acid, 5-nonylsalicylic acid, 2-hydroxy-3-methylbenzoic acid, m-cresotic acid, 5,5'-methylenedisalicylic acid, 2,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2,6- Dihydroxybenzoic acid, anacardic acid, 1-hydroxy-2-naphthoic acid, 2-hydroxy-3-naphthoic acid, 2-hydroxy-1-naphthoic acid and 3-phenyl-5- (α, α'-dimethylbenzyl) -salicylic acid. Such metal salts of aromatic carboxylic acids can be either alone or used in mixture become. The metal salt of the aromatic carboxylic acid is in an amount in the range of 0.1 to 20% by weight, based on the total amount of ink used.

In the above embodiment, the ink is colorless Dye / developer system using the Phenolic resin developer of the novolac type consists in some The possibility that the deleted font to tends to turn slightly yellow again when traces of deleted ink marks for a long period of time, after the font written with the ink with the extinguisher for the ink has been deleted, left standing become. Such a slight re-staining after deleting and then standing over one long period of time can be almost completely inhibited, by adding a phosphite triester to the ink. As phosphite triesters are those that are different from alcohols derived with 5 or more carbon atoms used. Examples of esters include trinonylphenyl phosphite, tricresyl phosphite,  Nonylphenyl-2-äthylhexylphosphit, Tridodecylphenyl phosphite, di-2-ethylhexylphenyl phosphite, di- 2-ethylhexyl nonylphenyl phosphite, dicresyl-2-ethylhexyl phosphite, Dicresyl octyl phosphite, dicrexyl nonyl phenyl phosphite, o-biphenyl nonylphenyl phosphite, tris isopropylidene phenyl phosphite and tris-4,4'-methylene-bis-phenyl phosphite. Such phosphite triesters may be used alone or in Mixture with one or more of the above Trieste can be used. The Trieste will be in a crowd of at least 0.2% by weight, based on the total weight the ink, used. Have liquid phosphite triesters Good compatibility with the novolak type phenolic resin. Therefore, the triesters can be used as part of the solvent become. In such a case, the liquid Phosphite triesters in an amount ranging up to 30 wt .-%, based on the total weight of the ink used become.

If desired, a resin that promotes color development not inhibited, used to determine the viscosity of the Ink or the fixing properties of the font too check. Examples of such resins are polybutene, a styrene / butadiene copolymer, polystyrene and Poly-α-olefins. If desired, lubricants, like paraffin wax, polyolefin wax or metal soap, used to lubricate or Lubricity of the ink to control. In the preparation of of ink for a ballpoint pen can polyvinylpyrrolidone, Polyvinyl butyral, polyvinyl ether, oleic acid and Oleate be added to the ink to the Viscosity of the ink to control.

In short, the ink used in the present invention is used in a simple way  by adding the developer, the colorless dye and the solvent for the ink in a device which generally works for the production of ink is used, such as a kneader, a three-roll ink mill or a stirrer.

Is it desirable to add a resin and a lubricant, These components can be used in the above components are added and mixed in the usual way.

The font written with the above ink can can be easily quenched by containing a desensitizing polar compound Extinguisher used. It is believed that by a reaction between the developer and the Electron-providing colorless dye formed colored Complex by the desensitizing effect of polar compound is decomposed and as a result thereof the font becomes colorless. Would you be an easily vaporizable using a polar compound in the extinguisher, there would be a tendency that at complete evaporation of the extinguisher the erased surface of the electron donating dye, which has been rendered colorless, again with the developer is implemented, eliminating the deleted font reappears. On the other hand, if that shows in the extinguisher used polar compound is difficult to evaporate and remains stable over time, this connection one stable erase feature for a long period of time after deleting, and the deleted font appears not again. However, if you try on the deleted surface immediately after deletion with to write the same ink, the tendency that the newly written Scripture by the on the deleted surface remaining extinguisher is rendered colorless. As a result,  need to delete the font so that they again with the same ink immediately after deletion can be used, polar compounds that are common Temperature are fixed, so that they are in molten State a desensitizing effect and erase ink but does not solidify any desensitizing effect show more when the solvent has evaporated. Under such polar compounds are compounds with lower Volatility suitable to provide a stable quenching property achieve. Polar compounds necessary above Suffice condition are desensitizing compounds with a melting point of 60 ° C or higher, but one Vapor pressure of 133.3 Pa or lower or a boiling point of 320 ° C or higher from the mentioned series.  

As a solvent for dissolving the above desensitizing Compounds are volatile solvents that at 160 ° C or below, suitable. As examples for such solvents may be mentioned: methanol, Ethanol, propanol, butanol, tetrahydrofuran, diisopropyl ether, Acetone, methyl isobutyl ketone, ethyl acetate, butyl acetate, Toluene, xylene, 1,1,1-trichloroethane, trichlorethylene, Perchlorethylene, methyl ethyl ketone, methyl cellosolve, Ethylcellosolve, dimethylformamide, 2-nitropropane and Dioxane. Among these solvents are the alcohols which Esters, the ethers, the ketones or mixtures thereof in particular preferred because it has a strong dissolving power for possess the writing, whereby a smooth reaction between the ink and the desensitizer is relieved to to give a quick extinguishing effect.

In the manufacture of the extinguisher by dissolving the desensitizing, organic compound common in ordinary Temperatures is solid, in the above solvent becomes the desensitizing, organic Compound in the solvent in such a Dissolved in a concentration of 2 to 40 wt .-% receives.

To fixation properties and the migration or Can improve migration characteristics of the extinguisher a resin that does not inhibit rewriting the extinguisher solution are added. Examples of such Resins are petroleum resins, polystyrene or styrene / butadiene Copolymers.

When deleting the colorless dye / developer ink written Font using the extinguisher solution  Can the extinguishing solution on the writing with the help of a brush etc. are applied as a coating. Alternatively it will a marker pen type pen container, like a container provided with a felt wick, with the Löschlösung filled for use.

A simpler method of use is to use the Mikroeinzukapseln extinguishing solution, the microcapsules obtained to combine with a solidifying agent or to connect together and the resulting solid in the same way as using fixed extinguishers. The Microencapsulation of the extinguishing solution can be done with the help of any conventional techniques, such as the coacervation method, the in-situ polymerization method and the in-situ polymerization method Drying method to be performed. is the particle size of the capsule 100 to 1000 microns and is the thickness of its membrane 3 to 40 microns, so the capsule easy to be broken by light rubbing, thereby the erasing solution can be effectively applied and a excellent lasting stability can. Examples of such solidifying agents for Combining the capsules are finely divided solidifying agents, such as calcined gypsum, resin solutions and waxes, like chalks and pastels. When solidifying the Capsule may be an extender, such as calcium carbonate, talc or clay, and additives such as a lubricant, wax and oil, be added to the application ability and strength to control in the solid state.

If a quench solution is used as a liquid and on applied paper may be the inconvenience occur that the extinguishing solution through the back passes through the paper, causing the writing on the Back of the paper or deleted on the second page  is, but this font should not be deleted. Around to remedy such a disadvantage, it is desirable the viscosity of the erasing solution to 10 to 200 mPa · s at 25 ° C. adjust.

As a method for adjusting the viscosity of the erasing solution can the amount of nonvolatile to be added Desensitizer or a desensitizer high molecular weight (with a molecular weight of preferably 1000 or more) with a relative weak desensitizing effect, but with one Thickening effect together with the desensitizer low molecular weight with strong desensitizing effect be used. However, there is a preferred one Method in using an organic compound high molecular weight, such as hydroxypropyl cellulose, polyvinyl butyral, high molecular weight polyvinylpyrrolidone, cellulose acetate butyrate or an ethylene / vinyl acetate copolymer, admit. If desired, a thickener, such as hydrogenated castor oil, dibenzylidene sorbitol or a metal soap, be used.

Are traces of deleted ink marks during one long time after deleting the ink written font using the above quencher solution exposed to sunlight, there is a tendency that the font again slightly yellowish brown. To one To avoid such phenomenon, it is advantageous to a Add ultraviolet light absorber to the erasing solution and to solve the means herein. The for this purpose suitable ultraviolet light absorbers should be such which in turn are colorless or light-colored, essentially  not a color development reaction with a colorless Dye which is mixed with the ink, subject and can be dissolved in the erasing solution. It can any of these materials without any particular limitation be used. As examples of such Ultraviolet light absorber can be called: 2-hydroxy-4 octyloxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2- Hydroxy-4-hydroxybenzylbenzophenone, 2- (2'-hydroxy-3 ', 5'- di-tert-butylphenyl) benzophenone, 5-chlorobenzophenone, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 4-tert-butylphenyl salicylate, p-octylphenyl salicylate, octoxyphenyl salicylate, Nickel-2,2'-thio-bis- (4-tert-octylphenolate) Nickel p-toluenesulfonate and nickel octylbenzenesulfonate. Such ultraviolet light absorbers can either alone or in mixture with one or more of other abovementioned ultraviolet light absorber be used. The ultraviolet light absorbers can preferably in an amount in the range of 0.2 to 5% by weight, based on the amount of extinguishing solution used.

Becomes a font written on paper with ink erased using the above erasing solution, In some cases, the phenomenon occurs that the paper becomes overly bright or even becomes transparent, as a nonvolatile desensitizer present in the quencher remains on the paper. In such a case see traces of deleted ink marks slightly blackened or they will be copied white if they are one Diazo-type copying is done as the transparency of the paper is increased. To such a disadvantage it is desirable to have a fluorescent Add brightener to the erasing solution. As a fluorescent Brightener can be used all materials  which in turn are colorless or light-colored and in the Löschlösung can be solved. As examples of such fluorescent brighteners can be named: fluorescent naphthalimide brighteners, fluorescent pyrazoline brighteners, fluorescent stilbene Brightener, fluorescent coumarin brightener and fluorescent Bisoxazole brighteners. The fluorescent brightener will in an amount in the range of 0.001 to 2 wt .-%, based on the amount of extinguishing solution used.

Can not get a good balance between the whitening effect (the traces of deleted ink marks on the Blackening prevents) and the effect of prevention of copying white when copying from diazo type it is preferred to have two or more fluorescent To use brightener in combination.

The above colorless dye-developer system ink and the above eraser of this ink can be practically used in the following manner. The ink can be used with conventional writing utensils such as marker pens and ballpoint pens. Fig. 1 shows a writing utensil 1 having a marking pen type structure. Within a sleeve 2 , an ink tank or container 3 is provided. The ink is fed through a felt or fibrous wick 4 to a writing tip 5 at the end of the sleeve. The writing tip 5 is formed by protruding the wick part 4 from the end of the sleeve 2 . 6 with a cap is referred to, which can be deducted from the sleeve 2 .

Fig. 2a shows a writing utensil having a ballpoint pen type structure. Within a sleeve 12 , an ink tank 13 is provided. At the end of the ink tank, a neck portion 14 a with a through hole 14 which forms an ink passage, is provided. As writing tip a writing ball 15 is rotatable in and partially protruding from the attachment part 14 a arranged. With a cap 16 is referred to, which can be deducted from the sleeve 12 . A spongy elastomer 17 is embedded in the bottom part of the cap 16 as shown in Fig. 2a. The exposed surface of this elastomer layer 17 is covered with a synthetic resin film 18 . When the cap 16 is slipped over the writing tip portion of the sleeve, the writing ball of the writing tip is held so that the ball is trapped by the film 18 in the elastomeric layer 17 as shown in Fig. 2b. By holding the writing ball of the writing tip in such a state, the exposed surface of the writing ball is covered with the film 18 so that evaporation of the ink from the exposed surface of the writing ball is inhibited, and the exposed surface of the writing ball can always be in one with the ink be kept moist condition. Thus, when the cap 16 is removed and writing is started, there is no initial smearing due to insufficient ink supply.

The erasing solution for the ink can be used not only by applying to the inked writing by means of a brush, etc., but also such that a container for a writing utensil such as a marking pen is filled with the erasing solution as shown in FIG , is filled. Fig. 3 shows an erase utensil 21st Within a sleeve 22 , a Lölösösungstank 23 is provided. The erasing solution is supplied to the tip of the sleeve through a porous passage member 24 made of a felt or a porous or porous resin. The application part 25 for the erasing solution is formed by protruding the porous passage part 24 from the tip of the sleeve 22 . With a cap 26 is designated, which is removable from the sleeve 22 .

In the above embodiments, the writing utensil and the erasing utensil are constructed in the form of separate sleeves. However, both a stylus type writing utensil and a quenching tool may be incorporated into a sleeve as shown in FIG. 4. In Fig. 4, a sleeve 32 is divided into two compartments by means of a divider 33 . Within a section of the sleeve 32 , an ink tank 3 is provided. Within the other section of the sleeve 32 , a tank 23 is provided for the erasing solution. The other constructions are the same as those of the marker pen type writing implement 1 of Fig. 1 and the erasing groove 21 of Fig. 3. The same reference numerals as in Figs. 1 and 3 are used to denote the corresponding parts. and therefore, the explanations for the same parts will be omitted.

Fig. 5 shows an embodiment in which the pen-type writing utensil 11 of Fig. 2a and the erasing tool 21 of Fig. 3 are incorporated in a sleeve 32 .

As stated above, the erasing solution of the present invention is microencapsulated, the microcapsules are bonded together using a solidifying agent and can then be used in the form of a solid shaped part, such as solid erasers. Fig. 6 shows a quencher 40 in the form of a solid molded part. This solid extinguisher 40 is constructed in a structure in which the microcapsules 41 enclosing the erasing solution as the core material are uniformly dispersed in the solidifying agent matrix 42 . This solid extinguisher 40 has the appearance of a conventional rubber extinguisher and is preferably embedded in a plastic housing 43 provided with a removable cap 44 .

By using the eraser in the form of a fixed molded part, the fixed eraser 40 can be held by a connecting part 50 at the rear end of the sleeve 2 ' of the marker pen type writing utensil 1 as shown in FIG . This fixed extinguisher 40 can also be retained by the connector 50 at the rear end of the sleeve 12 ' of the ballpoint pen type writing utensil 11 as shown in FIG . Other parts of Figs. 7 and 8 are the same as in Figs. 1 and 2a. The same reference numerals as in Figs. 1 and 2a are used to designate the corresponding parts, and the explanations for these parts are omitted.

The following examples and comparative examples illustrate The invention. In the examples and comparative examples All parts are expressed by weight.  

Example 1

Production of the extinguisher parts Diphenyl phthalate (desensitizer) 15 Polyester resin (desensitizer) 5 Toluene (solvent) 80

The above components were mixed and dissolved, by stirring for 1 h at 50 ° C to a Löschlösung to obtain. A marking pen part was filled with one Felt wick with the above Extinguishing solution to form an extinguishing tool.  

example 2

Production of the ink parts Novolac-type phenolic resin (developer) 30 Colorless fluoran dye (BK-14) 20 Benzyl alcohol (solvent) 20 Ethylene glycol monophenyl ether (solvent) 30

The above mixture was added by heating for one hour 100 ° C and to remove small amounts of insoluble Ingredients filtered to an ink according to to obtain the invention which was dyed black.

Man filling a pen (E-type for thin writing) with this ink. One drew a line on paper (writing paper A) with this writer. One examined the Writing at the time of writing. After that you left the script 7 days at 50 ° C and also examined the change the scripture over time. The results are listed in Table 1.

Production of the extinguisher parts N-vinylpyrrolidone / vinyl acetate copolymer (desensitizer) 7.5 Ethanol (solvent) 89.5 High molecular weight polyvinyl pyrrolidone (having an average molecular weight of 360,000) (viscosity modifier 3

The above components were dissolved by stirring make a erasing solution. An oil marker pen part was with this Löschlösung filled. The one written with the above ink Writing was rubbed a few times with this eraser, and it turned out that the writing was clearly deleted was.  

Comparative Example 1

Production of the ink parts Bisphenol F (developer) 30 Colorless fluoran dye (BK-14) 20 Benzyl alcohol (solvent) 20 Ethylene glycol monophenyl ether (solvent) 30

The ink was prepared in a similar manner as in Example 2, with the exception that bisphenol F as a developer in place of the novolak type phenol resin in Example 2 was used. One examined the writing at the time of writing and changing over time. The results are shown in Table 1.

Comparative Example 2

Production of the ink parts Novolac-type phenolic resin (developer) 30 Colorless fluoran dye (BK-14) 20 Diethylene glycol monobutyl ether (solvent) 30

The ink was prepared in a similar manner as in Example 2, with the exception that diethylene glycol monobutyl ether instead of the benzyl alcohol and the ethylene glycol monophenyl ether used in Example 2 as a solvent has been. One examined the writing at the time of writing and the change over time. The results are shown in Table 1.  

Table 1

As can be seen from Table 1, can be a clear line with the ink of Example 2 according to the invention as well as written with an oily pen ink. The written line bleaches during the rigorous test 7 days at 50 ° C is not enough. Therefore, this ink is considered Suitable ink, which can give a consistent font. On the other hand, there is no difference between the results of Comparative Example 1 and Example 2 at the time of writing, however, has the writing of the comparative example 1 the tendency to over time fading. From these results it is clear that a novolak-type phenolic resin used as a developer Ink gives a stable color, d. H. a more stable one Scripture, as such, the bisphenol A alone used as a developer. The font of the comparative example  2 was almost colorless at the time of writing and illegible. It is believed that this result the fact that is between the developer and the colorless dye, the color development reaction is inhibited as a polar compound with a strong, desensitizing effect as a solvent is used. After evaporation of the solvent the writing becomes dense and scarcely a fading The script observed over time as the phenolic resin of the novolac type was used as a developer.

example 3

Preparation of the ink: parts Novolac-type phenolic resin (developer) 30 colorless fluoran dye (PSD 150) 25 β-phenylethyl alcohol (solvent) 43 Oleic acid (lubricant) 2

The above mixture was added by heating for one hour 100 ° C and to remove small amounts of insoluble Ingredients filtered to give a black colored Ink according to the invention received.

This ink was on paper (writing paper A) with the help a knife coating method applied to a sample manufacture. One examined the degree of the fading of this sample after 5 hours of testing using a Fading knife and standing for 7 days at 50 ° C as well Color changes after immersion in water for 10 h. The results are shown in Table 2.  

Comparative Example 3

Preparation of the ink: parts Nonylphenol (developer) 30 colorless fluoran dye (PSD 150) 25 β-phenylethyl alcohol (solvent) 43 Oleic acid (lubricant) 2

The procedure of Example 3 was repeated with the Except that as a developer nonylphenol instead of the phenolic resin of novolak type in Example 3 was used. The degree of bleeding of a sample was investigated 5 hour test using a fading knife and after standing for 7 days at 50 ° C and color changes after immersion in water for 10 h. simultaneously were the ink of Comparative Example 1 and a commercial oily ballpoint ink subjected to the test. The results are given in Table 2.  

Table 2

As can be seen from Table 2, the degree of bleaching is the ink of Example 3 according to the invention comparable to that of a commercial, oily one Ballpoint pen ink. In the color change test after immersion in water for 10 h was the ink of the Example 3 in terms of fastness and durability compared to the commercial, oily ballpoint ink think. The inks of Comparative Examples 1 and 3, in bisphenol F alone or p-nonylphenol alone as Developer was used, tend to fade, and no consistent font can be obtained.

The with the according to Example 3 and Comparative Examples 1 to 3 written fonts were written some inks Male using a prepared in Example 2 Extinguisher rubbed. Each of the fonts could be deleted.  

example 4

Production of the extinguisher: G 4,4'-methylenebis (acetanilide) mp 236 ° C (desensitizer) 2 Methanol (solvent) 4 Ethanol (solvent) 4

The above components were mixed together and Stirred for 1 h at 50 ° C to a Löschlösung invention manufacture. An oil mark pen part was filled with this erasing solution to produce a quenching gun.  

example 5

Production of the extinguisher: G Polyvinyl acetate (desensitizer) 3 Ketone resin (desensitizer) 1 Ethyl acetate (solvent) 5 Methanol (solvent) 5

The above components were mixed together and dissolved under heating to a Löschlösung invention manufacture. An oil mark pen part was filled with this erasing solution to produce a quenching gun.

Example 6

Production of the extinguisher: G Ketone resin (desensitizer) 5 Toluene (solvent) 25

The above components were mixed together and dissolved under heating to a Löschlösung invention manufacture. 9 g of this erasing solution were dissolved in 30 g a 10% aqueous gelatin solution emulsion-dispersed and 30 g of a 10% aqueous gum arabic solution were added thereto. The mixture was at high speed stirred to produce an emulsifying dispersion.  

Thereafter, 140 ml of warm water at 40 ° C and stirred the mixture at medium speed. This gave 10% acetic acid is added dropwise to adjust the pH to 4.1 adjust. This dispersion was kept at 40 ° C for 2 hours and then slowly cooled to 5 ° C. After this, 0.5 ml was added Glutaraldehyde and left the mixture overnight, Decanted, washed with warm water and dried on the Air, to 10.5 g of microcapsules with a particle size of 10 to 50 microns to get the erasing solution as the core material which included.

These microcapsules were solidified in the following manner.

parts microcapsules 10.5 Paraffin wax (130 ° F or 54 ° C) 2.0 distearyl 6.0 microcrystalline wax 1.0 hardened oil 1.5 talc 3.0

The above components were mixed together. you The mixture melted by heating, stirred lightly, poured in a stick-like shape and cooled to solidification. After that, the molded part was removed to a eraser in the form of a solid extinguisher.  

example 7

The procedure of Example 6 was repeated except that the emulsifying dispersion with very mild stirring the microencapsulation of the erasing solution carried out in Example 7 has been. 10.5 g of microcapsules were obtained Particle size of 150 to 300 microns and a membrane thickness of 10 to 15 microns, which included the erasing solution as a core material.

After that, a solid quencher of the above microcapsules became in the same manner as prepared in Example 6.

Example 8

Production of the extinguisher: parts N-vinylpyrrolidone / vinyl acetate copolymer (3: 7) (desensitizer) 7.5 Ethanol (solvent) 87.5 high molecular weight polyvinylpyrrolidone (average molecular weight = 360,000) (viscosity modifier) 0-8

The above components were mixed together and Stirred at 50 ° C for 1 h to erase ink with different Produce viscosities. An oil mark pen part was filled with each of the above ink extinguishers to produce a fire extinguisher.  

example 9

Production of the extinguisher: parts N-vinylpyrrolidone / vinyl acetate copolymer (3: 7 (desensitizer) 15 Ethanol (solvent) 85

The above components were mixed together and Stirred for 1 h at 50 ° C to produce an ink extinguisher. Because the amount of desensitizer in this solution is greater than that of the desensitizer in Example 8 was its viscosity 22 mPas at 25 ° C without adding any Viscosity modifier.  

example 10

Production of the extinguisher: parts Diphenyl phthalate (desensitizer) 20 saturated polyester resin (high molecular weight desensitizer) 10 Toluene (solvent) 70

The above components were mixed together and Stirred at 70 ° C for 1 h to an ink extinguisher with a Viscosity of 35.4 mPas at 25 ° C. One filled an oil mark pen part with this extinguisher to to get a fire extinguisher.  

Example 11

Production of the extinguisher: parts Ethylene urea-formaldehyde resin (desensitizer) 10 Isobutyl acetate (solvent) 85 Cellulose acetate butyrate (viscosity modifier) 5

The above components were mixed together and Stirred at 70 ° C for 1 h to an ink extinguisher with a Viscosity of 57.5 mPas at 25 ° C. One filled an oil mark pen part with this extinguisher to to produce a fire extinguisher.

Example 12

Preparation of the ink: parts Novolac-type phenolic resin (developer) 25 Crystal violet lactone (colorless dye) 20 Benzyl alcohol (solvent) 30 Ethylene glycol monophenyl ether (solvent) 20 Zinc-5-tert-butyl salicylate 5

Blue ink was prepared by adding the above ingredients mixed. The mixture was heated at 100 ° C for 1 h dissolved and for removal of small amounts of insoluble constituents filtered. With the obtained blue ink was filled a pen. One tried on Paper with this pen using a drawing machine to write (load = 200 g, speed = 7 cm / sec; Angle = 70 °). The resulting writing was 5 h examined with the help of a fading knife, and man tested the degree of fading. The results are in Table 4 indicated.

Modification 1

Preparation of the ink: parts Novolac-type phenolic resin 30 crystal violet lactone 20 benzyl alcohol 30 Ethylene glycol monophenyl 20

One set blue ink with the above composition analogous to the preparation of Example 12 ago, wherein However, zinc 5-tert-butylsalicylate from the ink composition omitted from Example 12. It was tested Degree of fading analogous to Example 12. Simultaneously the degree of fading of a commercial one was tested Pen with oily, blue ink. The results are listed in Table 4.

Example 13

Preparation of the ink: parts Novolac-type phenolic resin (developer) 25 colorless fluoran dye (BK-14) 20 benzyl alcohol 20 Ethylene glycol monophenyl 30 Zinc 3-methyl-5-tert-butyl salicylate 5

One set a black ballpoint pen analogous to the Preparation of Example 12, taking the above Ingredients used. The degree of fading was checked a pen containing this black ink written pen analogous to Example 12. The results are shown in Table 4.

Modification 2

Preparation of the ink: parts Novolac-type phenolic resin 30 colorless fluoran dye (BK-14) 20 benzyl alcohol 20 Ethylene glycol monophenyl 30

Black ink of the above composition was prepared analogous to the preparation of Example 13 ago, wherein However, zinc 3-methyl-5-tert-butylsalicylate from the Omitted ink composition of Example 13. One tested the degree of fading of a written with this ink Font analogous to Example 13. At the same time examined the degree of fading one with a commercial one Ballpoint pen with black ink written font. The results are in Table 3.  

Table 3

From Table 3 it can be seen that the resistance improved against fading of the ink is obtained by adding a metal salt of an aromatic carboxylic acid Add the ink, and is approximately comparable with the one of a font that comes with a commercial one Oil pen was written.

Fonts made with the ink of Example 12, 13 and Comparative Example 4 and 5 could be written with the erased in Example 2 erased.

Example 14

Preparation of the ink: parts Novolac-type phenolic resin (developer) 25 Novolac-type phenolic resin (developer) 5 colorless fluoran dye (BK-14) 20 benzyl alcohol 20 Ethylene glycol monophenyl 20 trinonylphenylphosphite 10

The above components were mixed together and dissolved, to make a black ink. One drew Draw a line on paper with this ink. The obtained Scripture was left for 7 days at 50 ° C and proved to be unchanged.

Production of the extinguisher: parts Ethylene urea-butyraldehyde resin (desensitizer) 10 Ethanol (solvent) 70 Dioxane (solvent) 18.5 high molecular weight polyvinylpyrrolidone (average molecular weight = 360,000) (viscosity modifier) 1.5

The above components were mixed together and dissolved, to make a erasing solution. One filled one Oil marking pen part with this solution to a fire extinguisher manufacture. The one written with the above ink Font has been used several times with this extinguishing tool rubbed and cleared. The deleted track became 1 month at 50 ° C and did not stain. Furthermore, the font did not appear again.

Modification 3

Preparation of the ink: parts Novolac-type phenolic resin 25 Novolac-type phenolic resin 5 colorless fluoran dye (BK-14) 20 benzyl alcohol 20 Ethylene glycol monophenyl 30

Black ink of the above composition was prepared analogous to the preparation of Example 14 ago, wherein however, trinonylphenyl phosphite from the ink composition  omitted from Example 14. The ones with this ink written writing was allowed to stand for 7 days at 50 ° C and proved stable without any changes.

The writing was made with the one prepared in Example 14 Extinguisher deleted. The deleted track became one month old 50 ° C left. It turned out that Scripture was slightly colored.

example 15

Preparation of the ink: parts Novolac-type phenolic resin (developer) 30 colorless fluoran dye (PSD150) 20 β-phenylethyl alcohol (solvent) 45 Dicresyl-2-äthylhexylphosphit 5

The above components were mixed together and solved to make a black ink. One filled a ballpoint pen (E-type for thin writing) with this Ink. One tried, with this ballpoint pen on paper to write. One received a clear, black writing. The script was allowed to stand for 7 days at 50 ° C and proved to be stable without any changes.

The writing was made with the one prepared in Example 14 Extinguishing tool deleted. The deleted track became a month allowed to stand at 50 ° C. It was found that the deleted Track was not colored.  

Modification 4

Preparation of the ink: parts Novolac-type phenolic resin (developer) 30 colorless fluoran dye (PSD150) 20 β-phenylethyl alcohol (solvent) 50

Black ink of the above composition was analogous to the method of preparation of Example 15, wherein However, dicresyl-2-ethylhexyl phosphite from the ink composition omitted from Example 15. One with this Ink written font was allowed to stand at 50 ° C for 7 days and proved stable without any change.

This font was made with the one prepared in Example 14 Extinguishing tool deleted. The deleted track became a month allowed to stand at 50 ° C. It turned out that the deleted Trace was slightly colored.

example 16

Preparation of the ink: parts Novolac-type phenolic resin (developer) 10 Novolac-type phenolic resin (p-cresol / formalin precondensate) 20 colorless fluoran dye (BK-14) 15 Crystal violet lactone (colorless dye) 2 Benzyl alcohol (solvent) 30 Ethylene glycol monophenyl ether (solvent) 23

The above components were mixed together and dissolved, to make a black ink. One filled one Ballpoint pen (E type for thin writing) with this Ink to make a writing utensil.

Production of the extinguisher: parts Ethylene urea-butyraldehyde resin (desensitizer) 10 Ethanol (solvent) 70 Dioxane (solvent) 16 Octoxyphenylsalicylate (UV light absorber) 4

The above components were mixed together and dissolved, to make a erasing solution. One filled an oil Marker pen part with this solution to a fire extinguisher manufacture. A written with this ink Scripture was rubbed a few times with this extinguisher tool and clear deleted. The erased trace was subjected to a lightfastness Test for 10 h using a Fading knife exposed. It was found that the deleted font did not reappear.

modification of 5

Production of the extinguisher: parts Ethyleneurea-Butyraldehydharz 10 ethanol 70 dioxane 20

An erasing solution of the above composition was prepared analogous to the method of preparation of Example 16 ago, wherein However, the UV light absorber from the extinguishing composition omitted from Example 16. You put a fire extinguisher from the marking pen type.

A black ink prepared in Example 16 written writing was rubbed with this extinguishing tool and was clearly deleted. The deleted track became a lightfastness test analogous to Example 16 subjected. It was found that the font was a pale yellow Color reappeared.  

example 17

Production of the extinguisher: parts N-vinylpyrrolidone / vinyl acetate copolymer (3: 7) (desensitizer) 10 Ethanol (solvent) 80 Methyl isobutyl ketone (solvent) 8th 2- (2'-hydroxy-5'-methylphenyl) benzotriazole (UV light absorber) 2

The above components were mixed together and dissolved to make a Löschlösung. One filled an oil marking pen part with this erasing solution to to produce a fire extinguisher. One with the one in Example 16 written black ink was written rubbed with the extinguishing tool. The writing was clear deleted. The erased trace was subjected to a lightfastness Test analogous to Example 16 subjected. You put that the deleted font did not reappear.

Derivative 6

Production of the extinguisher: parts N-vinylpyrrolidone / vinyl acetate copolymer (3: 7) 10 ethanol 80 methyl isobutyl ketone 10

An erasing solution of the above composition was prepared analogous to Example 17, except that the UV light Absorber from the quenching composition of Example 17 omitting. One set a deletion tool from the marking pen Type forth.

A black ink prepared in Example 16 written writing was rubbed with this extinguishing tool. The font was clearly deleted. The deleted track was analogously to Example 16 a lightfastness  Test subjected. It was found that the deleted Font with a pale yellow color reappeared.

example 18

Preparation of the ink: parts Novolac-type phenolic resin (developer) 25 Novolac-type phenolic resin (p-cresol / formalin precondensate) 10 Crystal violet lactone (colorless dye) 20 Phenylglycol (solvent) 20 Benzyl alcohol (solvent) 25

The above components were mixed together and solved to make a blue ink. One filled one Ballpoint pen (E type for medium font) with this Ink to make a writing utensil.

Production of the extinguisher: parts N-vinylpyrrolidone / vinyl acetate copolymer (3: 7) desensitizer) 10 Ethanol (solvent) 80 Dioxane (solvent) 8th high molecular weight polyvinylpyrrolidone (average Molecular weight = 360,000) (viscosity modifier) 1.5 fluorescent coumarin brightener 0.01 fluorescent naphthalimide brightener 0.5

The above components were mixed together and dissolved to make a Löschlösung. One filled an oil marking pen part with this solution to a To produce extinguishing tool. One with the above blue Ink written font has been with this several times  Extinguishing tool grated. The font was clearly deleted. The deleted track was as white as the paper and not detectable. One tried the deleted surface with the same ballpoint pen containing blue ink 60 s after deletion to label. One received a clear font. The deleted track and the again Written track were under conditions of a speed performance from 4 to 7 using a Diazo-type copying machine copied. The deleted Track and rewritten track were completely imperceptible.

modification 7

An ink extinguisher was prepared analogously to Example 18, with however, one omitted the fluorescent brightener. you made a marker type extinguishing tool. One rubbed with this erase utensil one containing the blue ink Ballpoint pen written on paper font. The Font was deleted, but you could weak one Identify stains, such as oil stains, on the cleared track. One tried, the deleted track again with the same blue ballpoint ink 60 sec after deletion to label. One received a clear writing. The deleted track and the rewritten track were under Conditions of a speed performance of 4 to 7 using the same copying machine from Diazo Type as copied in example 18. The deleted track and the rewritten track was at a speed performance imperceptible in the range of 4 to 5.5, however, the deleted track became a whitish color at a speed performance in the range of 6 to 7 observed.  

example 19

Production of the extinguisher: parts Ethylene urea-butyraldehyde resin (desensitizer) 10 Ethanol (solvent) 70 Dioxane (solvent) 18 high molecular weight polyvinylpyrrolidone (average molecular weight = 360,000) (viscosity modifier) 1.5 fluorescent coumarin brightener 0.05

The above components were mixed and dissolved together, to make a erasing solution. One filled one Oil marking pen part with this solution to one To produce extinguishing tool. One rubbed with this extinguishing tool a writing on a file (ivory) with the blue ink prepared in Example 18 Ballpoint pen had been written. The font was completely deleted. The shine on the surface of the Paper around the erased track was essentially unchanged and imperceptible.

modification 8

An ink extinguisher was prepared analogously to Example 20, wherein however, one omitted the fluorescent brightener. you made a marker type extinguishing tool. One rubbed with this erase utensil a font written on a file paper (ivory) with that obtained in Example 18, pen containing blue ink has been written was. The writing was completely deleted, however, was the Shine on the surface of the paper changed around the deleted track and the ivory color accentuated. Thus was the deleted trace is distinguishable from the other parts of the paper.

Claims (9)

1. Ink consisting of

• a) a dye obtained by reacting from 1 to 40% by weight of a colorless dye precursor of the type crystal violet lactone, malachite green lactone or 3-dimethylamino-6-methoxyfluoran, 3,6-diethoxyfluoran, 1,2-benzo-6-diethylaminofluoran, 2 -Anilino-3-methyl-6-pyrrolidino-fluoran., 3 ', 6'-Bis- (diethylamino) -spiro (phthalan-1,9'-xanthine) and 1,1-bis (p-aminophenyl) -phthalan or di-β-naphthospiropyran, xantho-β-naphthospiropyran or benzo-β-naphthoisospiropyran was obtained with a novolak type phenol resin developer,
• b) from 25 to 50% by weight of a solvent from the series of aromatic alcohols or ethylene glycol monophenyl ethers and optionally one or more of the following components c), d) and / or e):
• c) 0.1 to 20% by weight of at least one Zn, Al, Sn or Ni salt of an aromatic carboxylic acid,
• d) 0.2 to 30% by weight of a phosphite triester derived from alcohols having 5 or more carbon atoms,
• e) lubricity and viscosity increasing agents, the percentages being based on the total amount of the ink.

2. An eraser for records and fonts with an ink according to claim 1, consisting of

• a) 2 to 40% by weight of a polar compound which is solid at ordinary temperature, exhibits a desensitizing effect in a molten state and can extinguish ink but does not solidify any desensitizing effect when the solvent has evaporated, with a melting point of 60 ° C or higher, but having a vapor pressure of 133 Pa or lower at 150 ° C or a boiling point of 320 ° C or higher, selected from the group consisting of diphenyl phthalate, diphenyl urethane, pentaerythritol tetraacetate, pentaerythritol tetrabenzoate, diphenylglycolic acid, ethylene glycol dibenzoate, N Phenyl-β-naphthylamine, phenyl-N-phenylanthranilate, methyl-N-phenylanthranilate, benzoguanamine, 4,4'-methylenebis (acetanilide), 4,4'-sulfonyl-bis (acetanilide), p-aminoacetanilide , Benzacetin, 4-butoxy-N-hydroxybenzene-acetamide, 2,3-dihydro-2,2-dimethyl-7-benzofuranol-methylcarbamate, cotoine, diaminodiphenylmethane, dianisidine, 4- (phenylmethylphenol) -carbamate, galactitol, diphenyl phthalate, 4 '- (Methylsulfamoy l) sulfanilylanilide, 4,4'-tetramethyldiaminodiphenylmethane, polyvinylpyrrolidone, polyvinyl acetate, N-vinylpyrrolidone / vinyl acetate copolymers, ketone resins, oligo-N-methylmorpholinium-propylene oxide, polyacrylates, polymethacrylates, polyesters, urea / formaldehyde resins, ethyleneurea / formaldehyde Resins, ethylene urea / butyraldehyde resins, poly-N-butoxymethyl-acrylamide and vinyl acetate / maleic acid copolymers and
• b) volatile solvents boiling at 160 ° C or below.

3. eraser for the ink according to claim 1, characterized that the viscosity of the erasing solution a range of 10 to 200 mPas at 25 ° C, by addition of hydroxypropyl cellulose, polyvinyl butyral, high molecular weight  Polyvinylpyrrolidone, cellulose acetate butyrate or an ethylene / vinyl acetate copolymer, hydrogenated castor oil, Dibenzylidensorbit or a metal soap set is. 4. eraser for the ink according to claim 1, characterized that the viscosity control of the extinguishing solution by adding a high molecular weight, organic compound with thickening effect with regard to the solution is carried out. 5. eraser for the ink according to claim 1, characterized characterized in that the erasing solution is two or more desensitizing compounds, of which at least one a high molecular weight, desensitizing Compound with a thickening effect is and the Viscosity control of the solution is effected by the amount of high molecular weight, desensitizing Connection controlled. 6. eraser for the ink according to claim 1, characterized in that the erasing solution continues to have a contains fluorescent brightener. 7. eraser for the ink according to claim 1, characterized in that the erasing solution continues to have a Ultraviolet light absorber contains. 8. eraser for the ink according to claim 1, characterized that the extinguisher a solid, shaped The object is made by uniform Disperse microcapsules as nuclear material contain a solution in a solidifying agent Matrix to connect them together and the  Forming dispersion to give the solution by putting in a solvent with a boiling point of 160 ° C or lower one of the mentioned in claim 2 desensitizing, polar compounds dissolves at ordinary temperatures is firm and a melting point of 60 ° C or higher and a vapor pressure of 133.3 Pa or lower at 150 ° C. 9. Use of a set of an ink and a quencher for the ink according to any one of claims 1 to 8, in one Set of a writing utensil and a delete utensil.