DE1197103B - Lithographic planographic printing film - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN W7WW> PATENT OFFICE

Int. α .:

B41n

EDITORIAL

German class: 151-3

Number: 1197103

File number: W 28396 VI b / 151

Filing date: August 18, 1960

Opening day: July 22, 1965

Applicant:

S. D. Warren Company, Boston, Mass. (V. St. A.)

Representative:

Dipl.-Ing. H. Beglich, patent attorney, Regensburg, Lessingstr.

Named as inventor: Stephan Vail Worthen, Raymond Lee Oranksy, Boston, Mass. (V. St. A.)

Claimed priority: V. St. v. America August 28, 1959 (836598)

The invention relates to sheets of paper for use in lithographic planographic printing film
as a flat printing film or matrix. The main requirement with these foils or matrices is

in that they can carry a film of lithographic dampening solution on the surfaces of the foil, where the text to be printed does not appear. If the lithographic dampening solution is not in a continuous If the film is present, the printing ink adheres in places to the surface of the film, and there is a sounding. In order to keep the solution on the surface, it must be prevented from in penetrates the carrier. This is also necessary because the color-absorbing image areas in a possible Penetration on the foil tends to be undermined and thus removed from the foil will.

The basic shape of such a film must therefore
with such demands from a strongly glued one
Carrier are formed, at least on one
Page over with a lithographic printing layer
is pulled. The previously used glue existed
made of a resin, however, it has been found
that wherever the resin is at or near
the surface of the film appeared, the wet solution ~

is displaced and in this way on the printed

thundering occurs. It is therefore necessary. The sheet preferably has a base layer

It has become dig to use very thick layers of foil material, which is part of the dimer, a mineral filler. Since the film is also coated or bulk and contains a binder, and the lithography Rolls wound in a certain state phical printing layer will be attached to the base layer must, it was worn as a 30 in practical use. It has been found that Proved necessary, a film layer on both one sheet with a base layer even better Sides of the main body to be used to produce print copies as if a base layer prevent the resin from not being applied from the uncoated side.

impaired an adjacent layer side. Various embodiments for the invention

According to the present invention, a paper application is written in more detail below on a lithographic planographic printing film,
a dimer of aliphatic ketene with 6 to Beisoiell

20 carbon atoms glued in its molecule and "

provided with a lithographic printing layer. A paper web weighing 27 kg

The dimer sizes the web very effectively and 40 per leaf strip 63.5 x 96.5 cm in area became out has the advantage that despite its very strong production it produced a yield that bleached 30 parts

long-fiber pulp from conifers and 70 parts of bleached short-fiber pulp from deciduous trees, the two pulp pieces were present in a moderate uniformity in the layer. Ground 45 degrees, and also finely divided 15 parts Furthermore, there is no transfer of calcium carbonate filler from the dimer from the supply an uncoated side of a sheet on top of the entry in an aqueous suspension coated side instead, causing the layer to be followed by Vs part of emulsified "Aquapel 364" how is affected. As a result, 0.15 part of »Stargum 719« has swelled less Layering material necessary because only one leaf has been treated in this way and dispersed in water.

Adhesive strength does not tend to tear the dampening solution film, even if only a thin layer of foil material used or even if small un-

side has to be coated, and consequently less coating is necessary.

"Aquapel 364" is a mixture of approximately equal parts of dimers of hexadecyl and tetra

509 627/228

3 4

decyl ketene. "Stargum 719" is a mixture of it in US Pat. No. 2,555,057

Galactomannan and modified starch. is. Then this cooked preparation with a

"Aquapel" is a fine coating clay (90 parts) made by the company, finely divided clay

Hercules Powder Co. registered trademark, for calcium carbonate (10 parts), the emulsified dimer > Stargum 719 «is a company 5 of hexadecenyl ketene (2.25 parts) and water

Paisley Products, Inc., registered trademark. (which is sufficient to cover the entire fixed stock

The paper web produced therefrom was mixed (to reduce 32%). The hexadecenyl is dried, calendered, and the ketene dimer is allowed to deposit using a five sieve for 48 hours. It was then emulsified by "Atlox 1096" for part of its weight, which was found to be effective against the ingress of water and polyethylene sorbitol hexaoleate,
watery writing ink was well sized. "Atlox" is one of the company

On one side of this paper web, 6.8 kg of Atlas Powder Co. registered trademark,
per ream dry weight of an aqueous over- applied Other starch adhesives of comparable Viskozugsmischung A, whose weight moderate intensity, such as oxidized starch or enzyme-compilation following was 15 converted starch, can instead of Penford Feiner Überzugston 100 ^Klei j ^{ter 280 in the} base layer formula B used

Penford paste 280 40 will be.

Pzgjj j * The paper web coated in this way was dried

7i «t. ™ rf« « / in and calendered on the paper machine. Then left

/ ilTl KdWCUli, HU 'Ann t · -I ι 1 · 1 1 ^

Monochloroacetic acid '. 3.5 ^{30 man sl} f 48 hours deposit if it comes from *

Propanol 30 showed that it was well sized.

Water to '' dilute '' on _Λ ^The J ** ^de f base coat was coated web

a solids content of 38% then on one side with 3.2 kg dry weight

a mixture of a spread A, furthermore

Penford paste 280 is a partially hydroxy- 25 thinned with water to reduce the solids

Ethyl starch ether, Parez 611, a product of the Ameri- partes coated to 28%. The coated track

can Cyanamid Co., is a partially condensed was dried, briefly heated to 300 ° C and then

Melamine formaldehyde resin. Monochloroacetic acid calendered.

acts as a catalyst or as an accelerator. The finished coated web was then made into sheets for Parez 611. Propanol is divided as network and counter 30 and with the double-coated side of the

foaming agent used. a sheet in contact with the primed

"Penford paste" is stacked on the side of the next sheet. The so-called company Penick & Ford Ltd., at "Parez" around one of the layered sheets, was artificially protected by the company American Cyanamid Co., while the goods were heated to 90 ° C for 4 hours,
sign. 35 The sheets were then double-coated

The coated or coated paper web is finished with a greasy typewriter tape

dried, quickly described by a to about 300 ° C, with an aqueous lithographic

heated oven for hardening the Parez resin and dampening solution made of acid phosphate, and they are moistened

the water-resistant adhesive then ran on an offset duplicating machine

fabric sent and then calendered. The 40 and printed over five hundred good copies. the

The paper web was then cut into sheets, the background areas remained clear and free from stains

were piled up; so that the coated side and tonings, and it showed up in this way,

of the one sheet in direct contact with that no disadvantageous transfer from sheet to sheet

the uncoated side of the other sheet. took place during deposition.

The stacked sheets became 45 ° at 90 ° C.

Heated for 4 hours. After this period of time Example III

artificial deposition and aging were The same, in Example II with a base coat

The sheets on the coated side with a fat-covered base was on one side with

typewriter tape and ran 1.4 kg per ream of dry weight of a

then as lithographic printing foils on a 50 setting of the spreading formula A diluted with water

Offset duplication machine. The copies were coated to a solid content of 20%. That

excellent with no appearance of clay or coated paper was then dried, few

Stains. Cured for seconds at 300 ° C and then calendered.

Example II The paper was then divided into sheets

55 and stacked so that the double coated

An unsized paper web was made with a Ge side of a sheet with the base coated side withstands 50 parts of bleached wood fiber from needle- the next leaf in contact. Who rise up 50 parts of bleached wood fiber from deciduous-stacked leaves were then artificially heated at 90 ° C trees and 15 parts of finely divided calcium carbonate deposited for 4 hours. The artificially aged bonat filler manufactured. The web weighed approximately 60 sheets on the double coated side 23.5 kg per ream. This web was written on a paper through a typewriter with a greasy tape machine written on both sides with a squeegee. A written page was folded, device with 1.4 kg per side dry weight so that through the provided with a figure coated with a base layer mixture B, which resulted in a fracture. She then went back like that is made: 65 folded, with an aqueous lithographic

47.5 parts of Penford paste 280, 2 parts of di-dampening solution made from acid phosphate and moistened

methylol resin, 0.12 part sodium carbonate and printed with an offset duplicating machine.

110 parts of water were boiled together as there were over twenty-five good copies of it

printed. There were no stains or toning on the background surface. The break in the layer did not create a black line or scar in the copy.

Example IV

A sheet provided with a base layer according to Example II was without further treatment with written on a typewriter with greasy tape. The sheet was then on the plate cylinder an offset duplicating machine and printed from it in the usual way. There were made more than ten copies of it without toning the background. The copies were legible, but slightly weaker than the original image, which shows that the coated web is slightly less oil than was addicted to water.

A comparison of Examples I, II and III shows that good results were achieved when the above lithographic printing layer between 1.4 and 6.8 kg per ream changed and of the same composition was. This is in opposition to the knowledge of others who put it down as necessary have to increase the ratio of adhesive to pigment, such as the weight of the planographic printing layer decreases. The difference is undoubtedly due to the fact that the one used earlier The base of the paper itself was so strongly oleophilic that one had to make sure that it was continuous Ensure that the floor area is covered by a film of coating material. Otherwise there would have been a toning of the background.

In sheets according to the invention, however, the paper base provided with a base layer is less oleophilic as the top planographic printing layer used. As a result, even if it surrenders is not completely coated with a continuous film, no toning of the background out of this fact.

The aqueous spread A used in the previous examples can be replaced by a large numbers of such lithographic foil coating assemblies can be replaced. For example, the adhesive used in coating formula A can be replaced by oxidized starch, carboxyl-methyl-cellulose, Polyvinyl alcohol, carboxymethyl hydroxyethyl cellulose and many others, as described in British patent specification 633 747, be replaced. When casein, soy protein, or others, coagulable by heavy metal salts If adhesives are used, the zinc acetate must be omitted from the coating formula. In other Cases, the zinc acetate can be omitted, if necessary, and the resulting product Product still gives satisfactory results. The following formula C is an example of such a coating.

Coating Formula C

In 292 units of water there are 40 units of partially hydroxylated starch (this is Penford paste 280) and 12 units of partially condensed melamine formaldehyde resin (that is Parez 605) dispersed. The mixture is heated to 99 ° C and held at 99 ° C for approximately 15 minutes, until a sample that has been removed and cooled to 25.5 ° C. has a viscosity of 8 g / cm · see, measured on a Brookfield viscometer. The mixture is then cooled and added to 100 parts finely divided clay, 100 parts of water, 0.4 parts of sodium sulphate derivative of 7-ethyl-2-methyl-undecanol and 0.2 parts of tributyl phosphate mixed. The last two components act as Wetting and anti-foaming agents. Such a layer can be applied to the base layer in an amount from 1.4 to 6.8 kg per ream of dry weight can be applied and gives satisfactory results.

The ketene dimers used to glue the web can be produced by reacting a fatty acid in known manner to form an acid chloride and then by reacting the acid chloride with one Tertiaramine can be produced. Various specific dimers are commercially available although they almost always contain small amounts of other dimers. The presence of others Ketene dimer is not objectionable. In fact, it has been found that the invention in the works the same way when two ketene dimers have been mixed together on a 50:50 basis. Specific dimers that have been found to be satisfactory are hexadecyl ketene dimer, hexadecenyl dimer, Tetradecyl ketene dimer and dodecyl ketene dimer. Other dimers that are essentially Representing equivalents are practically usable in the same way.

It should be noted that the dimer of hexadecenyl ketene at ordinary room temperature is liquid and can therefore be treated more conveniently than those dimers that are used in Are firm at room temperature.

The aliphatic ketene dimers are insoluble in water. You can, however, by using in water dispersed by emulsifying agents. Generally speaking, it can be anything satisfactory Process for making aqueous dispersions of paraffin wax for making more satisfactory ones Dispersions of ketene dimers can be used. For example, the ketene dimer mixed in hot water with cation starch or with rubber gutti and then through a colloid mill to produce a satisfactory aqueous dispersion. The usage of polyethylene sorbitol hexaoleate (1 part for 5 parts of ketene dimer as described above) results another suitable dispersion method for ketene dimers.

Claims (2)

Patent claims: 1. Lithographic planographic printing film, thereby characterized in that a paper support with a dimer of aliphatic! Keten from 6 to 20 carbon atoms glued in its molecule and provided with a lithographic printing layer is. 2. Planographic printing film according to claim 1, characterized in that it is provided with a base layer provided with at least part of the dimer, a mineral filler and a binder which lies on the paper web under the lithographic printing layer. 509 627/228 7.65 © Bundesdruckerei Berlin