US3082171A

US3082171A - Magnetic lithographic ink

Info

Publication number: US3082171A
Application number: US51291A
Authority: US
Inventors: Clarence J Shoemaker; Hoffmann Tadeusz
Original assignee: AB Dick Co
Current assignee: AB Dick Co
Priority date: 1960-08-23
Filing date: 1960-08-23
Publication date: 1963-03-19
Anticipated expiration: 1980-03-19

Description

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Ser. No. 767,093. This application Aug. 23, 1960,

Ser. No. 51,29l

2 Claims. (Cl. 252-4325) This invention relates to magnetic ink for use in lithographic duplicating machines to produce copy capable of being read. with the magnetic reading head in automatic,

high speed, scanning devices.

This is a continuation of my copending application Serial Number 767,093, now abandoned, entitled Magnetic Lithographic Ink, filed October 14, 1958.

It relates more particularly to a lithographic duplicating ink embodying characteristics essential for use with magnetic read-out devices and a component or better wetout of the paper to produce a full image such as would be desirable for successful operation in magnetic read-out.

It is an object of this invention to product a magnetic ink having lithographic properties for use in lithographic duplicating machines to produce magnetic printing, and it is a related object to produce a lithographic ink of the type described containing a. magnetic component in the form of a magnetic iron oxide; which produces easily readable and well defined copy; which produces a full and complete image; which does not feed back into the fountain solution of the lithographic duplicating machine thereby to keep the fountain free of contaminating magnetic particles; which produces copy having sufficient magnetic strength for eificient and proper read-out, and which is capable of producing a large member of copies of good quality. y

In accordance with the practice of this invention, a magnetic ink for lithographic duplication is formulated of the combination of the following materials present in amounts as hereinafter set forth.

EXAMPLE 1 Magnetic Ink Composition (Broad) Percent by weight Lithographic vehicle or varnish -60 Magnetic iron oxide -70 Toners or tinctorial agents 1-20 Lecithin 1-5 Lithographic ink varnishes are well known to the trade. They usually comprise a base capable of fluid flow. The base may be a bodied oil, such as linseed oil, or a hydrocarbon, or an oil from the synthetic resinous materials such as alkyd resin or a phenolformaldehyde resin. The following are classes of varnishes which can be used:

Linseed modified phenol formaldehyde varnish Bodied linseed oil varnish Maleic-alkyd varnish Pentaerythritol alkyd varnish Hydrocarbon varnish It is preferred to. make use of a lithographic varnish giving a high degree of Water repellency to'the copy. A suitable varnish is marketed by General Printing Ink Company under the designation No. 01269.

As to the magnetic iron oxide, use can be made of Bfldli'il iatented Mar. 19, l9i3 ice pany of Easton, Pennsylvania, under the trade name IRNlOO.

The toner comprises a tinctorial agent to impart a desired shade and readability to the copy. Use can be made of such conventional toners as carbon black, lamp black, alkali blue, iron blue, and other dyestuffs and pigments. They may be incorporated as a dry pigment or as a dispersion in varnish oils for introduction into the composition.

The surface active agent functions also as a wetting agent for the pigment, and for wet-out of the surface upon which the magnetic ink is deposited in printing to produce a full and complete image. For this purpose, best use can be made of a lecithin. A suitable material (soy bean licithin) is marketed by American Lecithin Company,

Long Island City, New York, under the trade name Alcolec 410N.

The following are specific examples of magnetic lithographic inks prepared in accordance with the practice of this invention:

EXAMPLE 2 It will be understood that the amounts of the. components may be varied within the range described to provide the desired viscosity characteristics which can best be determined by trial and error.

For example, in a preferred range. the varnish made up of bodied oil or a resin or oil modified resin, alone or in combination with an oil, such as linseed oil, may be employed in an amount within the range of 20-45% by weight; the magnetic iron oxide may be employed in an amount within the range of 45-60% by weight; the surface active agent, such as lecithin, may be employed in an amount within the range of 1-5 by weight, and the tinctorial agent, such as carbon black, iron blue and the like, alone or in combination, may be employed in an amount within the range of 1-5 by weight.

The materials may be incorporated in any order but it is best to mix all of the ingredients and then to grind the material in conventional-machines for the preparation of an ink.

It will be understood that changes may be made in the details of the formulation and composition without depart- (3. ing from thespirit f the i lention, especially as defined References Citezi in the file of this patent m claims UNITED STATES PATENTS A magnetic gr phic link consisting essentially 2,649,381 Hgmpcl et a1 Aug. 18 1953 of wmbifiation of 2 -60% by Weight lithographic 2,688,649 Bjorksm Sam 7, 1954 varnish, -70% by weight magnetic iron oxide, 1-20% by weight tinctoriai agent, and 15% by weight lecithin. OTHER REFERENCES 2. A magnetic, lithographic ink consisting essentially of D the combination f 2 5 by weight lithographic Wolfe: Printing and Litho Inks, 4th ed., Macnan- Dornish, -60% by weight magnetic iron oxide, 1-5% by 10 land New York, 1949, PP- weight tinctorial agent, and 1-5% by weight lecithin. 161-162, 176-183, 187, 205, 232, 270-276.

Claims

1. A MAGNETIC, LITHOGRAPHIC LINK CONSISTING ESSENTIALLY OF THE COMBINATION OF 20-60% BY WEIGHT LITHOGRAPHIC VARNISH, 25-70% BY WEIGHT MAGNETIC IRON OXIDE, 1-20% BY WEIGHT TINCTORIAL AGENT, AND 1-5% BY WEIGHT LECITHIN.