CA1153888A - Recording material, particularly impression sheets, and method of producing a coating mass - Google Patents
Recording material, particularly impression sheets, and method of producing a coating massInfo
- Publication number
- CA1153888A CA1153888A CA000355220A CA355220A CA1153888A CA 1153888 A CA1153888 A CA 1153888A CA 000355220 A CA000355220 A CA 000355220A CA 355220 A CA355220 A CA 355220A CA 1153888 A CA1153888 A CA 1153888A
- Authority
- CA
- Canada
- Prior art keywords
- color component
- chromogenous
- recording material
- color
- dissolving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
- B41M5/132—Chemical colour-forming components; Additives or binders therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Color Printing (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A recording material sheet to be written or printed upon, which is coated with a chromogenous color component which, under pressure, produces a coloring reaction in conjunction with a second reagent which contains a color developer. The color component is provided in the form of micro-coagulated, flaky particles in a finely distributed manner upon the recording sheet, accompanied by the use of a binder. Also disclosed is a method of producing a coating mass, containing a chromogenous color component, for application upon a recording material. The chromogenous color component is converted into a dispersion-like form by dissolving or melting into saponifiable chemicals and subsequently emulsifying in water. According to another embodiment for producing a coating mass containing a chromogenous color component for application upon recording material, the color component is converted into a water soluble form by chemical reaction, for example by adding organic acids, whereafter the chemically reacted color component is dissolved in water. By adding alkali, the acid is neutralized again in such a manner that the color component precipitates finely and in a flaky form; thereafter, binders, such as starch or synthetic material dispersion are added.
A recording material sheet to be written or printed upon, which is coated with a chromogenous color component which, under pressure, produces a coloring reaction in conjunction with a second reagent which contains a color developer. The color component is provided in the form of micro-coagulated, flaky particles in a finely distributed manner upon the recording sheet, accompanied by the use of a binder. Also disclosed is a method of producing a coating mass, containing a chromogenous color component, for application upon a recording material. The chromogenous color component is converted into a dispersion-like form by dissolving or melting into saponifiable chemicals and subsequently emulsifying in water. According to another embodiment for producing a coating mass containing a chromogenous color component for application upon recording material, the color component is converted into a water soluble form by chemical reaction, for example by adding organic acids, whereafter the chemically reacted color component is dissolved in water. By adding alkali, the acid is neutralized again in such a manner that the color component precipitates finely and in a flaky form; thereafter, binders, such as starch or synthetic material dispersion are added.
Description
` llS3888 The present invention relates to recording material, particularly impression sheets to be printed or written upon, which are coated with a chromogenous (chromophoric~ color component which under pressure produces a color reaction in conjunction with a second reagent, which contains a color developer. The present invention also relates to a method of producing a coating mass for application to the recording material.
With known recording sheets of this type (German Auslegeschrift - 22 28 430), a carrier sheet is coated with a basic reacting chromogenous color component and/or with an acid reacting phenolic material. When this material engages with the chromogenous color component in a common dissolving medium, the material reacts to form color, whereby the carrier sheet additionally has a metal salt soluble in a dissolving medium.
The color is created with this known recording material as a conse-quence thereof that a reaction occurs between an oil soluble phenolformal-dehyde resin and a basic reacting, colorless chromogenous color component when both reagents are dissolved in a common dissolving medium. Both reagents can be located either on the same carrier sheet or on separate sheets which together form the recording material, for example a set of forms. The common dissolving medium for the reagents is enclosed or encapsulated by polymer material in microcapsules capable of being ruptured or broken by pressure during writing or printing thereon; the dissolving medium is isolated from one or both reagents when both reagents are located on a single carrier sheet.
With a known set of forms, the encapsulated dissolving medium is located upon one of the two sheets of the set of forms, and in particular, either on a sheet of its own, or together with one of both reagents, whereby these can already be dissolved in the dissolving means or can be separate therefrom.
$~
' --`" 11538~8 With these known recordin~ sheets, it is disadvantageous that the copy or duplicate quality, ~he rapidity of the copy development, as well as the color strength and aging durability of the copy cannot be considered fully satisfactory. Frequently an unpleasant smell from the paper occurs due to the dissolving medium.
As a consequence of the encapsulation of the chromogenous color component or the other reaction partner, the known recording materials have further considerable disadvantages. For example, it is practically impossible with the production to provide the walls of the capsules with identical wall strength or thickness, and to distribute the capsules uniformly upon the paper web. In practice, as a consequence of the clamping or balling together of individual capsules, there results a so-called clustering forma~ion (Trauben), which leads to production and quality problems. Furthermore, it is disadvan-tageous that the capsules can rupture prematurely in an undesired manner, whereby premature, undesired bluing or discoloration occurs.
Finally, the production of these known coating masses is relatively expensive and requires special measures relative to quality control.
From ~erman patent 22 19 527 it is already known to utilize a solid, dry, chromogenous color component which is adsorbed upon the surface of the paper coating pigments. With this known method, the chromogenous color com-ponents must be dissolved in a suitable dissolving medium, and must subsequent-ly be mixed with the paper coating pigments. After this mixing, the dissolving means is expelled or driven off again by heat. This method has the drawback that for the fine, uniform distribution of the chromogenous color components, large quantities of organic dissolving medium are needed, which represents a great environmental burden. A further drawback consists in that with a possible recovery of the dissolving means, high investment costs as well as
With known recording sheets of this type (German Auslegeschrift - 22 28 430), a carrier sheet is coated with a basic reacting chromogenous color component and/or with an acid reacting phenolic material. When this material engages with the chromogenous color component in a common dissolving medium, the material reacts to form color, whereby the carrier sheet additionally has a metal salt soluble in a dissolving medium.
The color is created with this known recording material as a conse-quence thereof that a reaction occurs between an oil soluble phenolformal-dehyde resin and a basic reacting, colorless chromogenous color component when both reagents are dissolved in a common dissolving medium. Both reagents can be located either on the same carrier sheet or on separate sheets which together form the recording material, for example a set of forms. The common dissolving medium for the reagents is enclosed or encapsulated by polymer material in microcapsules capable of being ruptured or broken by pressure during writing or printing thereon; the dissolving medium is isolated from one or both reagents when both reagents are located on a single carrier sheet.
With a known set of forms, the encapsulated dissolving medium is located upon one of the two sheets of the set of forms, and in particular, either on a sheet of its own, or together with one of both reagents, whereby these can already be dissolved in the dissolving means or can be separate therefrom.
$~
' --`" 11538~8 With these known recordin~ sheets, it is disadvantageous that the copy or duplicate quality, ~he rapidity of the copy development, as well as the color strength and aging durability of the copy cannot be considered fully satisfactory. Frequently an unpleasant smell from the paper occurs due to the dissolving medium.
As a consequence of the encapsulation of the chromogenous color component or the other reaction partner, the known recording materials have further considerable disadvantages. For example, it is practically impossible with the production to provide the walls of the capsules with identical wall strength or thickness, and to distribute the capsules uniformly upon the paper web. In practice, as a consequence of the clamping or balling together of individual capsules, there results a so-called clustering forma~ion (Trauben), which leads to production and quality problems. Furthermore, it is disadvan-tageous that the capsules can rupture prematurely in an undesired manner, whereby premature, undesired bluing or discoloration occurs.
Finally, the production of these known coating masses is relatively expensive and requires special measures relative to quality control.
From ~erman patent 22 19 527 it is already known to utilize a solid, dry, chromogenous color component which is adsorbed upon the surface of the paper coating pigments. With this known method, the chromogenous color com-ponents must be dissolved in a suitable dissolving medium, and must subsequent-ly be mixed with the paper coating pigments. After this mixing, the dissolving means is expelled or driven off again by heat. This method has the drawback that for the fine, uniform distribution of the chromogenous color components, large quantities of organic dissolving medium are needed, which represents a great environmental burden. A further drawback consists in that with a possible recovery of the dissolving means, high investment costs as well as
- 2 -.
.
11538~
continuous personnel and operating costs are necessary. Finally, an additional cost-intensive working step is unavoidable. Yet another drawback is that for optimum copy quality, increased quantities of chromogenous color components are necessary, as a result of the strong adsorption of the chromogenous color components on the paper coating pigments.
The object of the present invention, in comparison, is to provide a recording material, especially a recording or writing sheet, which, while a~oiding the aforementioned drawbacks, makes possible an extremely fine and uniform color component distribution with the least possible portion of chromogenous color components, and assures an optimum good copy quality, high speed of the copy development with extremely fine sharpness, as well as a sufficient color strength of the copy.
With this object in mind, the present inventive recording material of the initially mentioned types is characterized primarily in that the color component is provided finely distributed upon the recording sheet in the form of micro-coagulated, flaky particles, along with a binder. In this connection, the inventively embodied color component is provided in the receiving layer of the recording m,~terial.
Thus, the present invention involves a dissolving-medium-free recording sheet in which the chromogenous color component is present in a fine, micro-coagulated, flaky form.
With such a recording material, a wandering of the chromo-genous color component, which can lead to premature bluing or discoloration at the boundary layers between the individual reaction partners, is avoided. Since the recording material is free of 8~
dissolving medium, neither any environmental burden nor any undesirable smell results from a dissolving means. The material is further distinguished by high light stability and aging stability. Additionally, the recording sheets and the actual coat-ing material are inexpensive to produce because of the low raw material cost.
The present invention further concerns a method of produc-ing a coating mass, containing a chromogenous color component, for application upon a recording material, particularly a writing sheet of the initially mentioned type; when pressure is applied, the coat-ing mass reacts with a layer containing the color developer to pro-duce color.
Thus, in another aspect, the invention provides a method of producing a coating mass containing a chromogenous color component, for application together with a binding agent to a record-ing material, said method comprising the steps of dissolving, or melting chromogenous color component in an acidic substance, and adding water and alkali to liberate said color component in the form of flaky, micro-coagulated particles.
In particular, the invention provides a method of producing a coating mass containing a chromogenous color component, for application upon recording material, said method comprising the steps of converti~g chromogenous color component into a dispersion-like form by dissolving or melting in saponifiable, acidic chemicals, subsequently emulsifying in water and adding alkali to effect saponification of said saponifiable chemicals, thereby liberating said color component in the form of flaky, micro-coagulated particles.
Alternatively, there is provided a method of producing a `;`~' 115~8~3 coating mass containing a chromogenous color component, for applicat-ion upon recording material, said method comprising the steps of converting chromogenous color component into a water soluble form by dissolving in an aqueous acidic substance, adding alkali, to neutralize resulting acid, in such a way that said color component precipitates in the form of flaky, micro-coagulated particles, and adding binder.
The inventive method of producing the coating mass can also be undertaken in such a manner that the chromogenous color component is converted into a flaky, micro-coagulated form by dissolving in an organic or inorganic acid and neutralization thereof by leaching.
According to a further embodiment of the teaching of the present invention, the micro-coagulated color component can be bound or fixed on the paper surface with binding means, for example a synthetic material dispersion, aqueous resin solutions, a micro-wax dispersion, or natural binding means.
The inventively embodied micro-coagulated color component can be embedded in a wax-like receiving layer. The color component can furthermore be applied, in combination with organic and inorganic pigments, upon the surface of the reeording material, for example upon the paper surfaee. In this eonnection, aeeording to a further embodiment of the method, for dissolving or melting the color eomponent, fatty aeids, (sebaeie acids), preferably stearie aeids, can be used. However, acid amides or fatty acid amides are also suitable for dissolving or melting the color components.
The ehromogenous color component is deeomposed to very fine, flaky partieles by a miero-coagulation so that even with small quantities of chromogenous color eomponents, very high eoloring - 4a -11538~1~
power can be obtained.
Compared with the previously known method, with which thechromogenous color component is applied by dissolving agent to paper coating pigments, there results with the inventive utilization of micro-coagulated chromogenous color components, that the use of chromogenous material, with the same color intensity, can be considerably reduced, namely as much as 40~. This is attributed to the fact that the chromogenous color component is provided exclusive-ly in its active form on the paper surface, and not partially adsorbed by the coating pigments, as with the known solutions. With the inventive method of producing the coating mass, the color component is dissolved or melted in cold, heated, or even hot saponifiable chemicals, for instance an organic or inorganic acid, such as a stearic or maleic acid. Depending upon the solubility of the color component, a temperature of 30C to 140C is utilized.
With this procedure, attention must be paid to accomplishing a complete dissolving or melting. It was discovered that stearic acid is particularly suitable for carrying out the method. With color components which are insoluble or difficult to dissolve, or when the dissolving agent has poor dissolving power for the color component, it is expedient to undertake heating as far as into the range of the melting temperature of the color component.
The color components dissolved or melted in the saponi-fiable chemicals, i.e. the dissolving agent, are then added into water while undergoing ~1538~3~
vigorous stirring; this water can be warmed or heated. According to the type of saponifia~le chemicals an emulsion results in which the dissolved color component forms a mixing component existing in already fine distribution.
If the color components and dissolving agents are soluble in cold water, for instance certain acid amides, then the stirring can occur at normal temperatures. In this way, a dispersion results in which the color component already exists in fine distribution.
If, however, the dissolving agent, such as stearic acid, is insoluble or soluble only with difficulty at normal temperature, then it is advisable to heat the water to the melting range of the dissolving agent in order to be able to emulsify the latter in a liquid phase. Higher acid amides, such as fatty acid amides, palmitic acids, and the like, which are insoluble or soluble only with difficulty in water, must be emulsified until they exist in a suit-able dispersion.
Thereafter, by adding alkalies, the saponifiable chemicals are con-verted into the corresponding soap, in which connection they are converted into a colloid-soluble form. As a consequence of this chemical saponification reaction, the water insoluble color component is released slowly by flaking-out with increasing saponification. In view of this, the particle size and also the particle form can be controlled in that the liquor or lye is, for example, added slowly, for instance dropwise, to attain large flakes. With quicker addition, smaller flakes of the color component can be obtained.
During slow saponification, a fine color distribution occurs, whereas with a quick saponification, a coarser color component distribution occurs. The resulting soap additionally has a strong capillary or boundary surface-active effect, which brings about a further improvement of the color component dis-persal.
11538~B
After termination of the saponification reaction, the appropriate pigments, such as calcium carbonate, titanium dioxide, as well as calcium stearate, or other similar pigments, can be added.
The mixture is cooled off for example to 30C; thereafter, the bind-ing agents, such as starch, polyvinyl alcohol, synthetic material dispersions, or also micro-wax dispersions can be added. There is then obtained a finished liquid coating mass which can be applied to a recording sheet without further treatment.
With a recording sheet, for example a set of forms, the inventively produced coating mass are applied as a receiving layer.
It should be noted that, if during the pressure application only the wax of the wax layer with the color developer is pressed into the adjoining layer containing the color component, so that no delivery or transfer of color component particles to the other layer occurs, then a receiving layer exists.
When the inventive coating or layer mass is applied as a receiving layer, then a transmitting layer contains the counter reaction mass, i.e. the developer material, so that by pressure the transmitting layer is transferred onto the receiving layer, whereby the color reaction occurs in the interfaces.
With known recording materials, the color component is in the coating mass in capsules, whereby through pressure, i.e. during writing or printing, a chemical reaction occurs in that the capsule ruptures, the dye or coloring material liquid discharges, and a color-forming chemical reaction occurs with the substance of the counter-reaction liquid; or the chromogenous color component is finely distributed by dissolving medium upon paper coating or layering pigments, whereby through intimate contact with the counter-., ~ .
' , .
11~38~8 reaction layer, the color formation occurs. In contrast, with the present invention, the color component is no longer contained or encapsulated in a capsule, nor adsorbed upon the surface of the paper coating or layering pigments, but rather lies in finely micro-coagulated or precipitated flaky form directly on the paper surface, whereby the bonding on the paper surface can occur with small quantities of binding agent.
Since the color component is inventively arranged on the paper surface in micro-coagulated form, the pressure sensitivity 1~ of the coated paper is considerably reduced in comparison to the known method, with which the color forming means is contained in capsules.
Also, it is no longer necessary that a special space-maintaining means be embedded, as required with the known micro-capsule papers, in order to preclude a premature, unintentional rupturing of the color capsules, for example during rolling-up of the paper.
A further possibility of finely distributing chromogenous color component in an aqueous coating mass in the inventive manner, comprises converting the chromogenous color component into the water soluble form by a chemical reaction, for example by adding organic acids, as a result of which certain chromogenous color components can be dissolved in the water. Also under these circumstances, by adding alkalies, the acids can be neutralized again, whereby the color component precipitates in a fine and flaky form. An aqueous paste or pulp results, in which the chromogenous color component exists in the finest distribution and, after the addition of binders, such as starch or synthetic material dispersion, needs only to be ~ 538~
spread on the paper.
Example Color preparation 720 g water 60 g starch 8 g polyacrylic salt 16 g polyvinyl alcohol 30 g titanium dioxide The individual components are dissolved or suspended during stirring. The starch is turned into paste by heating the mixture to 95C.
Color component preparation 80 g stearic acid (saponification number 200) 15 g crystal violet-lactone (CVL) 5 g spiro-dibenzopyran (xanthene) 5 g diazo-rhodamine-lactone The color components are dissolved at a temperature of 120C while stirring.
While stirring very vigorously, the color component mixture is slowly added to the color mixture. The shear forces must be so high that an emulsion-like distribution of the color component mixture results.
.
.: ' ~ ' '- ':
.
':
- , , .' :: ' 1~538?~8 Subsequently, 5 g potassium hydroxide are dissolved in 20 g water and are added dropwise into the entire mixture.
The mixture is thoroughly mixed at a temperature of 95C while stir-ring vigorously for 20 minutes.
After successful partial saponification, the mixture is cooled to 30C, and the further chemicals are added in the following sequence:
6no g calcium carbonate 120 g calcium stearate dispersion 250 g acrylic styrene copolymer dispersion Papers are coated on one side with 2 _ 4 g/m2 of the coating mass.
Example 2 parts dry parts wet calcium carbonate 250 250 maleic acid 24 24 triarylmethane coloring material 12 12 titanium dioxide 60 60 polyvinyl-vinylchloride copolymer 200 400 water 254 24 parts of maleic acid are dissolved in 254 parts of water. The chromogenous color component is slowly stirred into this solution and immedi-ately dissolves. After complete dissolving, the calcium carbonate is slowly stirred in, triggering neutralization. The termination of the neutralization is indicated by the decolorization of the chromogenous color component. The titanium dioxide is thereafter added as pigment while stirring, and the poly-vinylacetate-vinylchloride dispersion is added.
The present invention is, of course, in no way restricted to the specific disclosure of the specification and examples, but also encompasses any modifications within the scope of the appended claims.
_ 10 -
.
11538~
continuous personnel and operating costs are necessary. Finally, an additional cost-intensive working step is unavoidable. Yet another drawback is that for optimum copy quality, increased quantities of chromogenous color components are necessary, as a result of the strong adsorption of the chromogenous color components on the paper coating pigments.
The object of the present invention, in comparison, is to provide a recording material, especially a recording or writing sheet, which, while a~oiding the aforementioned drawbacks, makes possible an extremely fine and uniform color component distribution with the least possible portion of chromogenous color components, and assures an optimum good copy quality, high speed of the copy development with extremely fine sharpness, as well as a sufficient color strength of the copy.
With this object in mind, the present inventive recording material of the initially mentioned types is characterized primarily in that the color component is provided finely distributed upon the recording sheet in the form of micro-coagulated, flaky particles, along with a binder. In this connection, the inventively embodied color component is provided in the receiving layer of the recording m,~terial.
Thus, the present invention involves a dissolving-medium-free recording sheet in which the chromogenous color component is present in a fine, micro-coagulated, flaky form.
With such a recording material, a wandering of the chromo-genous color component, which can lead to premature bluing or discoloration at the boundary layers between the individual reaction partners, is avoided. Since the recording material is free of 8~
dissolving medium, neither any environmental burden nor any undesirable smell results from a dissolving means. The material is further distinguished by high light stability and aging stability. Additionally, the recording sheets and the actual coat-ing material are inexpensive to produce because of the low raw material cost.
The present invention further concerns a method of produc-ing a coating mass, containing a chromogenous color component, for application upon a recording material, particularly a writing sheet of the initially mentioned type; when pressure is applied, the coat-ing mass reacts with a layer containing the color developer to pro-duce color.
Thus, in another aspect, the invention provides a method of producing a coating mass containing a chromogenous color component, for application together with a binding agent to a record-ing material, said method comprising the steps of dissolving, or melting chromogenous color component in an acidic substance, and adding water and alkali to liberate said color component in the form of flaky, micro-coagulated particles.
In particular, the invention provides a method of producing a coating mass containing a chromogenous color component, for application upon recording material, said method comprising the steps of converti~g chromogenous color component into a dispersion-like form by dissolving or melting in saponifiable, acidic chemicals, subsequently emulsifying in water and adding alkali to effect saponification of said saponifiable chemicals, thereby liberating said color component in the form of flaky, micro-coagulated particles.
Alternatively, there is provided a method of producing a `;`~' 115~8~3 coating mass containing a chromogenous color component, for applicat-ion upon recording material, said method comprising the steps of converting chromogenous color component into a water soluble form by dissolving in an aqueous acidic substance, adding alkali, to neutralize resulting acid, in such a way that said color component precipitates in the form of flaky, micro-coagulated particles, and adding binder.
The inventive method of producing the coating mass can also be undertaken in such a manner that the chromogenous color component is converted into a flaky, micro-coagulated form by dissolving in an organic or inorganic acid and neutralization thereof by leaching.
According to a further embodiment of the teaching of the present invention, the micro-coagulated color component can be bound or fixed on the paper surface with binding means, for example a synthetic material dispersion, aqueous resin solutions, a micro-wax dispersion, or natural binding means.
The inventively embodied micro-coagulated color component can be embedded in a wax-like receiving layer. The color component can furthermore be applied, in combination with organic and inorganic pigments, upon the surface of the reeording material, for example upon the paper surfaee. In this eonnection, aeeording to a further embodiment of the method, for dissolving or melting the color eomponent, fatty aeids, (sebaeie acids), preferably stearie aeids, can be used. However, acid amides or fatty acid amides are also suitable for dissolving or melting the color components.
The ehromogenous color component is deeomposed to very fine, flaky partieles by a miero-coagulation so that even with small quantities of chromogenous color eomponents, very high eoloring - 4a -11538~1~
power can be obtained.
Compared with the previously known method, with which thechromogenous color component is applied by dissolving agent to paper coating pigments, there results with the inventive utilization of micro-coagulated chromogenous color components, that the use of chromogenous material, with the same color intensity, can be considerably reduced, namely as much as 40~. This is attributed to the fact that the chromogenous color component is provided exclusive-ly in its active form on the paper surface, and not partially adsorbed by the coating pigments, as with the known solutions. With the inventive method of producing the coating mass, the color component is dissolved or melted in cold, heated, or even hot saponifiable chemicals, for instance an organic or inorganic acid, such as a stearic or maleic acid. Depending upon the solubility of the color component, a temperature of 30C to 140C is utilized.
With this procedure, attention must be paid to accomplishing a complete dissolving or melting. It was discovered that stearic acid is particularly suitable for carrying out the method. With color components which are insoluble or difficult to dissolve, or when the dissolving agent has poor dissolving power for the color component, it is expedient to undertake heating as far as into the range of the melting temperature of the color component.
The color components dissolved or melted in the saponi-fiable chemicals, i.e. the dissolving agent, are then added into water while undergoing ~1538~3~
vigorous stirring; this water can be warmed or heated. According to the type of saponifia~le chemicals an emulsion results in which the dissolved color component forms a mixing component existing in already fine distribution.
If the color components and dissolving agents are soluble in cold water, for instance certain acid amides, then the stirring can occur at normal temperatures. In this way, a dispersion results in which the color component already exists in fine distribution.
If, however, the dissolving agent, such as stearic acid, is insoluble or soluble only with difficulty at normal temperature, then it is advisable to heat the water to the melting range of the dissolving agent in order to be able to emulsify the latter in a liquid phase. Higher acid amides, such as fatty acid amides, palmitic acids, and the like, which are insoluble or soluble only with difficulty in water, must be emulsified until they exist in a suit-able dispersion.
Thereafter, by adding alkalies, the saponifiable chemicals are con-verted into the corresponding soap, in which connection they are converted into a colloid-soluble form. As a consequence of this chemical saponification reaction, the water insoluble color component is released slowly by flaking-out with increasing saponification. In view of this, the particle size and also the particle form can be controlled in that the liquor or lye is, for example, added slowly, for instance dropwise, to attain large flakes. With quicker addition, smaller flakes of the color component can be obtained.
During slow saponification, a fine color distribution occurs, whereas with a quick saponification, a coarser color component distribution occurs. The resulting soap additionally has a strong capillary or boundary surface-active effect, which brings about a further improvement of the color component dis-persal.
11538~B
After termination of the saponification reaction, the appropriate pigments, such as calcium carbonate, titanium dioxide, as well as calcium stearate, or other similar pigments, can be added.
The mixture is cooled off for example to 30C; thereafter, the bind-ing agents, such as starch, polyvinyl alcohol, synthetic material dispersions, or also micro-wax dispersions can be added. There is then obtained a finished liquid coating mass which can be applied to a recording sheet without further treatment.
With a recording sheet, for example a set of forms, the inventively produced coating mass are applied as a receiving layer.
It should be noted that, if during the pressure application only the wax of the wax layer with the color developer is pressed into the adjoining layer containing the color component, so that no delivery or transfer of color component particles to the other layer occurs, then a receiving layer exists.
When the inventive coating or layer mass is applied as a receiving layer, then a transmitting layer contains the counter reaction mass, i.e. the developer material, so that by pressure the transmitting layer is transferred onto the receiving layer, whereby the color reaction occurs in the interfaces.
With known recording materials, the color component is in the coating mass in capsules, whereby through pressure, i.e. during writing or printing, a chemical reaction occurs in that the capsule ruptures, the dye or coloring material liquid discharges, and a color-forming chemical reaction occurs with the substance of the counter-reaction liquid; or the chromogenous color component is finely distributed by dissolving medium upon paper coating or layering pigments, whereby through intimate contact with the counter-., ~ .
' , .
11~38~8 reaction layer, the color formation occurs. In contrast, with the present invention, the color component is no longer contained or encapsulated in a capsule, nor adsorbed upon the surface of the paper coating or layering pigments, but rather lies in finely micro-coagulated or precipitated flaky form directly on the paper surface, whereby the bonding on the paper surface can occur with small quantities of binding agent.
Since the color component is inventively arranged on the paper surface in micro-coagulated form, the pressure sensitivity 1~ of the coated paper is considerably reduced in comparison to the known method, with which the color forming means is contained in capsules.
Also, it is no longer necessary that a special space-maintaining means be embedded, as required with the known micro-capsule papers, in order to preclude a premature, unintentional rupturing of the color capsules, for example during rolling-up of the paper.
A further possibility of finely distributing chromogenous color component in an aqueous coating mass in the inventive manner, comprises converting the chromogenous color component into the water soluble form by a chemical reaction, for example by adding organic acids, as a result of which certain chromogenous color components can be dissolved in the water. Also under these circumstances, by adding alkalies, the acids can be neutralized again, whereby the color component precipitates in a fine and flaky form. An aqueous paste or pulp results, in which the chromogenous color component exists in the finest distribution and, after the addition of binders, such as starch or synthetic material dispersion, needs only to be ~ 538~
spread on the paper.
Example Color preparation 720 g water 60 g starch 8 g polyacrylic salt 16 g polyvinyl alcohol 30 g titanium dioxide The individual components are dissolved or suspended during stirring. The starch is turned into paste by heating the mixture to 95C.
Color component preparation 80 g stearic acid (saponification number 200) 15 g crystal violet-lactone (CVL) 5 g spiro-dibenzopyran (xanthene) 5 g diazo-rhodamine-lactone The color components are dissolved at a temperature of 120C while stirring.
While stirring very vigorously, the color component mixture is slowly added to the color mixture. The shear forces must be so high that an emulsion-like distribution of the color component mixture results.
.
.: ' ~ ' '- ':
.
':
- , , .' :: ' 1~538?~8 Subsequently, 5 g potassium hydroxide are dissolved in 20 g water and are added dropwise into the entire mixture.
The mixture is thoroughly mixed at a temperature of 95C while stir-ring vigorously for 20 minutes.
After successful partial saponification, the mixture is cooled to 30C, and the further chemicals are added in the following sequence:
6no g calcium carbonate 120 g calcium stearate dispersion 250 g acrylic styrene copolymer dispersion Papers are coated on one side with 2 _ 4 g/m2 of the coating mass.
Example 2 parts dry parts wet calcium carbonate 250 250 maleic acid 24 24 triarylmethane coloring material 12 12 titanium dioxide 60 60 polyvinyl-vinylchloride copolymer 200 400 water 254 24 parts of maleic acid are dissolved in 254 parts of water. The chromogenous color component is slowly stirred into this solution and immedi-ately dissolves. After complete dissolving, the calcium carbonate is slowly stirred in, triggering neutralization. The termination of the neutralization is indicated by the decolorization of the chromogenous color component. The titanium dioxide is thereafter added as pigment while stirring, and the poly-vinylacetate-vinylchloride dispersion is added.
The present invention is, of course, in no way restricted to the specific disclosure of the specification and examples, but also encompasses any modifications within the scope of the appended claims.
_ 10 -
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINES AS FOLLOWS:
1. Recording material sheet to be written or printed upon, said recording material comprising a coating of chromogenous color component which under pressure produces a color reaction in con-junction with a second reagent, which contains a color developer, said color component being finely distributed upon said recording material in the form of flaky, micro-coagulated particles, along with a binder.
2. Recording material according to claim 1, in which said color component is present in a receiving layer.
3. A method of producing a coating mass containing a chromogenous color component, for application together with a binding agent to a recording material, said method comprising the steps of dissolving, or melting chromogenous color component in an acidic substance, and adding water and alkali to liberate said color component in the form of flaky, micro-coagulated particles.
4. A method of producing a coating mass containing a chromo-genous color component, for application upon recording material, said method comprising the steps of converting chromogenous color component into a dispersion-like form by dissolving or melting in saponifiable, acidic chemicals, subsequently emulsifying in water and adding alkali to effect saponification of said saponifiable chemicals, thereby liberating said color component in the form of flaky, micro-coagulated particles.
5. A method according to claim 4, which includes the step of applying said color component to the surface of said recording material in combination with pigments selected from the group consisting of organic and inorganic pigments.
6. A method according to claim 5, which includes the step of using fatty acid to dissolve or melt said color component.
7. A method according to claim 6, in which said fatty acid is stearic acid.
8. A method according to claim 5, which includes the step of using amides selected from the group consisting of acid amides and fatty acid amides to dissolve or melt said color component.
9. A method of producing a coating mass containing a chromo-genous color component, for application upon recording material, said method comprising the steps of converting chromogenous color component into a water soluble form by dissolving in an aqueous acidic substance, adding alkali, to neutralize resulting acid, in such a way that said color component precipitates in the form of flaky, micro-coagulated particles, and adding binder.
10. A method according to claim 9, which includes the step of converting said color component by adding organic acid.
11. A method according to claim 9, in which said binder is selected from the group consisting of starch and synthetic material dispersion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2926837.9 | 1979-07-03 | ||
| DE19792926837 DE2926837C2 (en) | 1979-07-03 | 1979-07-03 | Process for the production of a recording material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1153888A true CA1153888A (en) | 1983-09-20 |
Family
ID=6074810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000355220A Expired CA1153888A (en) | 1979-07-03 | 1980-07-02 | Recording material, particularly impression sheets, and method of producing a coating mass |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5611296A (en) |
| CA (1) | CA1153888A (en) |
| DE (1) | DE2926837C2 (en) |
| DK (1) | DK248280A (en) |
| FR (1) | FR2460209A1 (en) |
| GB (1) | GB2054686B (en) |
| NL (1) | NL8003861A (en) |
| SE (1) | SE447225B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58168596A (en) * | 1982-03-31 | 1983-10-04 | Naigai Kaaboninki Kk | Copying sheet |
| US5192638A (en) * | 1984-12-10 | 1993-03-09 | Spectrum Sciences B.V. | Toner for use in compositions for developing latent electrostatic images, method of making the same, and liquid composition using the improved toner |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE485589A (en) * | 1944-01-31 | |||
| FR1461483A (en) * | 1965-09-15 | 1966-02-25 | Moncharvy Bureau Et | Advanced Mimeograph Paper |
| DE1926370B1 (en) * | 1969-05-23 | 1970-09-03 | Ncr Co | Paper copy receiving sheet |
| FR2065884A5 (en) * | 1969-10-17 | 1971-08-06 | Ibm | Reactive graphic transfer material |
| DE2747899B2 (en) * | 1977-10-26 | 1979-08-23 | Aktieselskabet For Kontor Kemi, Glostrup (Daenemark) | Pressure sensitive copy compsn. - comprises solid soln. of colour precursor dispersion in oil phase |
-
1979
- 1979-07-03 DE DE19792926837 patent/DE2926837C2/en not_active Expired
-
1980
- 1980-06-10 DK DK248280A patent/DK248280A/en not_active Application Discontinuation
- 1980-06-19 SE SE8004557A patent/SE447225B/en not_active IP Right Cessation
- 1980-06-26 GB GB8020882A patent/GB2054686B/en not_active Expired
- 1980-06-27 FR FR8014416A patent/FR2460209A1/en active Granted
- 1980-07-02 CA CA000355220A patent/CA1153888A/en not_active Expired
- 1980-07-03 NL NL8003861A patent/NL8003861A/en not_active Application Discontinuation
- 1980-07-03 JP JP9003480A patent/JPS5611296A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| SE8004557L (en) | 1981-01-04 |
| FR2460209A1 (en) | 1981-01-23 |
| DK248280A (en) | 1981-01-04 |
| GB2054686B (en) | 1983-08-24 |
| FR2460209B3 (en) | 1982-04-16 |
| SE447225B (en) | 1986-11-03 |
| DE2926837A1 (en) | 1981-01-08 |
| DE2926837C2 (en) | 1982-04-15 |
| GB2054686A (en) | 1981-02-18 |
| JPS5611296A (en) | 1981-02-04 |
| NL8003861A (en) | 1981-01-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4162165A (en) | Process for the production of microcapsular coating compositions containing pigment particles and compositions produced thereby | |
| EP0011367A1 (en) | Pressure-sensitive recording material and process for its production, coating composition, capsules and microcapsules therefor | |
| US3554781A (en) | Method of producing pressure-sensitive recording papers | |
| US4435004A (en) | Record material carrying a color developer composition | |
| JPS62168538A (en) | Microcapsule containing colorant | |
| CA1153888A (en) | Recording material, particularly impression sheets, and method of producing a coating mass | |
| EP0042265B1 (en) | Record material carrying a colour developer composition | |
| US4343494A (en) | Carbonless copy paper system | |
| JPS5919193A (en) | Heat sensitive recording paper | |
| US5354724A (en) | Heat sensitive recording materials with polymer enrobed sensitizer | |
| EP0048131A2 (en) | Color-former sheet for carbonless copying | |
| US3311489A (en) | Transfer sheet and method of preparing | |
| GB2028888A (en) | Colour-developing sheet for pressure-sensitive copying paper | |
| US4546365A (en) | Record member | |
| US4254971A (en) | Pressure-sensitive record material and preparation thereof | |
| US4347282A (en) | Chemical carbonless copy paper and transfer medium therefor | |
| US5169826A (en) | CF ink and tandem printing process | |
| US4111874A (en) | Transparent pressure-sensitive coatings | |
| JPS5833116B2 (en) | Self-coloring pressure-sensitive recording paper | |
| CA1185091A (en) | Record material | |
| US5942464A (en) | Method and apparatus for printing | |
| US4327939A (en) | Chemical carbonless copy paper and image receptor medium therefor | |
| JPS63262281A (en) | Microcapsule sheet for pressure-sensitive copying | |
| JPH0453190B2 (en) | ||
| JPS6021874B2 (en) | Coating sheet for microcapsules |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |