DE1471717B2 - PRINT SENSITIVE COLORLESS COPY PAPER - Google Patents

Description

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The invention relates to a pressure sensitive quality as having a coating of such clays

bright, colorless copier paper, the papers provided with electrons.

has taking clays, which are able to colorless From the German patent specification 966 130 it is

It is also known to adsorb compounds of an electron donor, an insoluble one in a recording paper

and thereby develop a color. 5 to precipitate metal silicate that comes into contact with

The common pressure-sensitive copier paper, a colorless organic marking liquid in which color development using it turns it into a colored state. as Electron donating or accepting substances, marking liquid, organic compounds are not effected comprises a paper sheet, the back side of which has a lactone ring such as 3,3-bis-one Electron donor surface forms, as well as another io (p-dibutylaminophenyl) phthalide called. The scored However, paper sheet, the surface of which has electrons on it, color intensity is extremely low, too taking area forms. In contrast to clays, the electron donor areas are the insoluble metal coated with a solution that particulate silicates are incapable of reacting alone with benzoyl leuco- and to react against each other isolated colorless electron methylene blue.

contains donor compounds, e.g. crystal violet 15 The object of the invention is to provide a

lactone, benzoylleucomethylene blue or the like, with copier containing electron-accepting clays

this material dissolved in non-polar solvents to indicate paper, which on the one hand is easier to manufacture

is e.g. B. in chlorinated diphenyl or the like; the insulation is more than the usual copier papers and other

of the particles contained in the solution against each other with respect to the color development of this at least

is caused by that one is not inferior in the form of a coating ao.

applying film-forming materials, e.g. B. Gelatin, This object is achieved according to the invention by

Agar-agar, albumin, a salt of alginic acid, fibri- the combination of the following features:

nogen, casein, soybean protein, pectin, gum _{a) the clays are in the} copy paper in the form of a

contain arabic, starch, starch acetate phthalate, cellulose filler

acetate phthalate, methylcellulose-ethylcellulose carb- 35 _{b) the} copier paper contains as an additional filler

oxymethyl cellulose, polyvinyl alcohol, polystyrene, _{polynes or several compounds of} cobalt,

acry ester, polymethacrylate, polyvinyl acetate, poly manganese or lead,
ethylene imine, polymer divmylbenzene, mixed polymers

of polyethylene and maleic anhydride, polymethyl- The compounds used according to the invention

ether-maleic anhydride copolymers, etc .; the 30 of cobalt, manganese and lead intensify the color ^

Electron-accepting surface is involved in the development of electrons not only because it is itself

receiving clays coated e.g. B. with attapulgite, act as electron accepting substances, but,

Terra alba, activated clay, fine-grained silica if you consider these substances from the standpoint of their effect

acid, kaolin, pyrophillite, halloysite, zeolite, bentonite considered as means for drying printing ink,

etc. 35 they promote the reaction by oxidation, which

The color is developed when the insulating material is produced more slowly by such metallic components as an oxygen coating on the electron donor surface, ie the capsule. In other words, at the point of contact between the two surfaces, one can destroy a print for the electron donor surface by using a locally effective sensitive copier paper with two types of bonding applied by writing, printing, etc., and this has been common up to now being, the squeezed solution being of the been. One of the compounds is the area that absorbs electrons and is adsorbed. For example, about crystal violet acetone, which has a coloring. Electron-accepting surfaces of this kind are wrapped up as soon as it is adsorbed, whereby the coloring of pressure-sensitive copier paper already gradually fades, but later gradually: produced the other way, that paper with an electron-45 connection is used coats itself around a compound such as absorbing clays, e.g. B. with attapulgite, benzoylleucomethylene blue, which stood in the adsorbed Zu-Terra alba, a product treated with acid, is gradually oxidized to a color from it (this material is produced by developing and the stability of the color during raw or dried terra alba or the like for a very long time.
Clay ground, it with hydrochloric acid, nitric acid, 50 The compounds used according to the invention sulfuric acid or the like at a temperature above of cobalt, manganese, lead or the like. The 90 ° C at atmospheric pressure or an overpressure increase the color of the former material and promote treated and the material if necessary with at the same time the color development of the latter material. Alkali neutralized, whereupon the product is filtered. In this respect, the invention achieves a washing, drying at 120 to 200 ° and grinding 55 extending the life of the copy paper, namely), together with adhesives, in particular through a considerable improvement in strength , Casein, latex or the like. The production of such color development.

Electron-accepting surfaces, however, with regard to the form of use of the cobalt, two work steps, d. H. The manufacture of the paper manganese and lead compounds should be noted that a and the application of the coating, and since the inorganic salt, which is not soluble in water, passes through During the application of the coating there is often a reaction of the aqueous solution in a colloidal one If events can occur, the result is a low level of efficiency in which the paper pulp and the electrons have an effect the manufacturing process. It is also absorbent clays containing aqueous suspension already known to record a paper with electrons, since in this case the physical and to fill the clays so as to increase the effectiveness of the 65 chemical function of a sensitizer To improve the manufacturing process, but is fulfilled in the best possible way.

Practice shows papers that absorb electrons as types of cobalt, manganese and lead compounds Clays are filled, a significantly poorer fertilizer come z. B. water-insoluble salts

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inorganic or organic acids in question, e.g. B. Example
Borate, phosphate, silicate, carbonate, sulfate, chromate,

Salts of resin acids, salts of carboxylic acids or the like. A 2% strength aqueous suspension of 10% of an aqueous suspension lead compounds can be used in both divalent and trivalent paper stock. A mixture of attapulgite and 5% of an aqueous solution of various lead compounds also proves to be useful, with cobalt chloride evenly mixed in, and then bar. while stirring an aqueous solution of Na These metal compounds, which according to the invention trium silicate of 41 ° Be (about Na ₂ O.3.2 SiO ₂ ) are used as fillers, are expediently added tenfold dilution in order to contain colloidal cobalt the amounts given below, based on iosilicate to be produced. The amounts of the above the weight of the fillers used: the raw materials mentioned were chosen so that the _B j _ei 2 0 to 15 ° / the following weight distribution resulted:

Manganese 0 ^ 5 to 4.5% paper stock 100 parts by weight

Cobalt 0.3 to '2.0 ° / ₀ attapulgite 50 parts by weight

. , '■ ..,,., ■ »5 cobalt (II) chloride ....... 3 parts by weight

A very strong effect can be achieved if sodium silicate solution of

two or three kinds of metallic components, 41 ⁰ Be 10 parts by weight

z. B. cobalt, manganese and lead compounds, equal

be used early in the form of a mixture. The pH number of the mixed aqueous solution prepared in this way

As clays to be used the next 20 suspension was 8.9, and the weight and the

Above-mentioned, electron-accepting clays in the ash content of the filled paper, which with the help of a

Question. Laboratory cylinder sieve machine was manufactured,

The amounts of clays and cobalt to be used were 50 g / m ² and 20.5%
Manganese or lead compounds vary depending on the

paper-making processes used. They set up 25 B bis ρ ie 1 2
depends on the extent to which the fillers are retained. Pressing the quantities of a 2% aqueous stock suspension in question in relation to the ash content of the finished paper from a 10 ° / ₀ aqueous suspension of the result were listed below areas: terra alba and a 5 ° / o aqueous solution of

largest range 10 to 40% ³ ° manganese (II) chloride mixed evenly, and then

A preferred range from 16 to 30 ° / ₀ ^became a 5% aqueous solution ^{with stirring}

particularly preferable range .. 20 to 25% ^{v n} ° enclosed with sodium pyrophosphate to Colloidal

To generate manganese pyrophosphate. Furthermore, was

If you want cobalt, manganese or lead compounds 1% colloidal robinia bean gum added,

When introduced into a paper, the after- 35 to improve the retention of the fillers. the

procedure indicated as appropriate. Quantities of the named raw materials were chosen in such a way that

1. A process by means of which a ^{formulation that} does not result in the following formulation in water:

soluble lead compound or the like in which the paper pulp 100 parts by weight

fabric and the clays containing aqueous Auf- Terra alba 50 parts by weight

Schwemmung is synthesized, whereupon the ⁴ ° manganese (II) chloride 5 parts by weight

Suspension for making paper Sodium pyrophosphate ... 6 parts by weight

is used. Locust bean gum .. 1 part by weight

. 2. A process by means of which one in water '. _TT _ ,,,. , ".

Insoluble lead compound or the like in the The pH number of the mixed aqueous

aqueous pulp ^{suspension synthesized 45} suspension was 8.4. With the filled paper that

whereupon the clays are added and produced ^{with the} hooves of the laboratory cylinder sieve machine ^

the suspension is then used to produce f ^st f ^{llt WU} , ^ ™ *, ™ ⁸ ° * ^{g /}

. Paper is used. Ash content 25.0% / ₀ .

3. A process by means of which an in water does not B e i s ρ i e 1 3

soluble lead compound or the like in an aqueous ⁵ ° ■ _. " _N,. .. ". ". ■ ~ '. ".

Clay suspension is synthesized, whereupon ^emer 2% aqueous suspension of paper stock

the paper stock is added, and the ^Aufwerd f ^{eme 10} A ¹ S ⁰ aqueous suspension of fine

flooding then for the manufacture of paper distributed silica which by the treatment of

Terra alba is used that was produced with sulfuric acid. and

4. A method according to which paper pulp, clay ^55, a 5% strength aqueous solution of lead acetate and a lead compound which is insoluble in water are mixed in uniformly. While stirring, a 5% strength was mixed at the same time, whereupon the aqueous borax solution was added to make a colloidal lead mixture and used to make paper. Jf? ^ also produce 10% colloidal

5. For a better understanding of the invention, melamine resin are attached of the given acidified with hydrochloric acid in the following several examples, including ^6o had been to the holding of the fillers should be understood to verjedoch that the invention do not improve. The quantities of these raw materials were the various conditions mentioned ^so S ^{ewahlt 'that} the following formulation resulted:

e.g. type, shape, amount etc. of the fillers, ^. ■. ". "" "^. ,

limits paper stock to 100 weight places

65 finely divided silica .. 50 parts by weight

It should be noted that all of the following examples contain lead acetate 10 parts by weight

derivable variants within the scope of the invention Borax 9 parts by weight

fall. Melamine resin 2 parts by weight

The pH of the final aqueous mixed dispersion was 6.7. The filled paper, which had been produced with the aid of the laboratory cylinder mold machine, had a weight of 50 g / m ² and an ash content of 26.4%.

Claims (7)

Patent claims: 1. Pressure-sensitive colorless copier paper containing electron accepting clays which are able to adsorb colorless compounds of an electron donor and thereby to develop a coloration, marked by combining the following features: a) the clays are contained in the copy paper in the form of a filler, b) the copier paper contains one or more water-insoluble salts of _ao cobalt, manganese or lead as a further filler. 2. Pressure-sensitive colorless copier paper according to claim 1, characterized in that the filler contained in the copy paper to 10 to 40 percent by weight, preferably 16 to 30 percent by weight, consists of electron accepting clays and lead compounds, wherein the lead constitutes 2 to 15 percent by weight of the weight of the clay. 3. Pressure-sensitive colorless copier paper according to claim 1, characterized in that it The clays are finely divided silica and the lead compounds are lead acetate. 4. Pressure-sensitive colorless copying paper according to claim 1, characterized in that the filler contained in the copy paper to - ¹ IO bis.40Gewichtsprozent, preferably 16 to 30 GewichtsJ> r}) zentV consists of electron-accepting clays and manganese compounds, said manganese 0 Makes up 5 to 4.5 percent by weight of the clay. 5. Pressure-sensitive colorless copier paper according to claim 4, characterized in that it The clay is terra alba and the manganese compounds are manganese (II) chloride. 6. Pressure-sensitive colorless copier paper according to claim 1, characterized in that the filler contained in the copy paper to 10 to 40 percent by weight, preferably 16 to 30 percent by weight, consists of electron accepting clays and cobalt compounds, wherein the cobalt constitutes 0.3 to 2 percent by weight of the weight of the clays. 7. Pressure-sensitive colorless copier paper ■ according to claim 6, characterized in that the clays are attapulgite and the Cobalt compounds are cobalt (II) chloride.