US 2195926 A
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Description (OCR text may contain errors)
Patented A r. 2, 1940 "UNITED sTATss 4 HEOTOGRAPH. MASS CONTAINING COLOR INTEN SIFIERS William Hos kinl, Jr., Ia Grange, Ill., auignor to Ditto, Incorporated, Chicago, 111., a corpora tion West Virginia t No Drawing. Application January 81, 1938,
Serial No. 187,911
The invention relates to the art of 'dupli-' eating. More-particularly, it relates to hectograph duplicating devices, hectograph duplicating compositions and to the reproduction of color de- 5 signs from such duplicating devices and compositions.
An object of the invention is to provide an eflicient and inexpensive hectograph mass for duplicating purposes.
Another object is to provide a duplicating mass from which copies of high color intensity may be prepared.
One form of the invention is a gelatinous duplicating mass of the hectograph type containing a salt of a hydroxy acid.
- The. gelatinous duplicating mass may suitably comprise an albuminous substance such as glue or gelatin, water, and a water soluble salt of a hydroxy acid, compatible with glue or gelatin,
such as sodium lactate, sodium oxy-butyrate, sodiuni citrate, and ammonium lactate. Preferably, however, it will also contain a water soluble high boiling liquid plasticizer such as glycerine or ethylene glycol.
The proportion of solvent and plasticizer (glycerine, water and salt of hydroxy acid) togbinder (glue or gelatin) may vary widely. Preferably,
however, the ratio of solvent and plasticizer to binder should be within 5 to 20 times the weight of the binder. This ratio will give a commercially suitable hectograph blanket.
By way of illustration, several suitable formulae for hectograph blankets are givenin the following table:
Example Ingredients 7 I II III a Porhby Pombr Pambi wet! weight weight as" it s a a Glycerine 250 an Sodium lactate 100 so 100 Invertsugar 80 Dietbylcnc glycol.-. 250
Other suitable formulae are given in the following table:
(CI. 41-3L6) vIt will be understood that the above gelatinous compositions may be adhered to a flexible backing-to form a duplicating roll constituting another embodiment of this invention.
Copies of color designs may be made from the 5 compositions of this invention by carrying out the steps oi. the ordinary hectograph process. In this process a design formed of a soluble dye is applied to a sheet by writing, typing or the like. This sheet with the design is called the master l0 copy. The design of the master copy is then con;
tacted with the duplicating mass, whereupon the dye of the design is largely transferred to the duplicating mass. Copies are then made by contacting copy sheets with the design on the du- 16 plicat mass.
The vention makes it possible to produce a large number of color designs of high color intensity. As far as is known, the copies are much brighter than have hitherto been made by the 20 use of prior art gelatinous duplicating masses oi! ,similar desirable mechanical and weather resisting properties.
.Whiie there have been shown and described certain forms of this invention, it is to be under- 25 stood that it is capable of marry modifications. Changes, therefore, in, the construction and arrangement may be made without departing from the spirit and scope of the invention as described in the appended claims, in which it is the inten- 30 tion to claim all novelty inherent in the invention as broadly as possible, in view of the prior art. i
In the claims the term gelatin is intended to include ordinary glue, sometimes called impure 35 gelatin, but which more strictly is a decomposition product resulting from the breakdown of gelatin moleciues into molecules of less molecular weight.
I claim: o-
1. A hectograph blanket oi! such shape and flexibility as to be capable, when secured to a flexible backing, of being wound into a rolland used in a hectograph machine, said hectograph' blanket having incorporated therein a salt oi a 4 hydroxy acid as a color intensifier.
. 2. A hectogra ph blanket of such shape and flexibility as to be capable, when secured to a flexible backing, of being wound intoa roll and used in a hectographmachine, said hectographblanket comprising an albuminous substance and a water soluble salt oi! a hydron acid.
3. A hectograph blanket of such shape an flexibility as to be capable, when secured to a flexible backing, of beingwound into a roll and used in a hectograph machine, said hectograph' blanket comprising gelatin. water, a polyhydroxy alcohol and a water soluble salt of a hydroxy acid.
4. A hectograph blanket of such shape and flexibility as to be capable, when secured to a flexible backing, oibeing wound into a roll and used in a hectograph machine, said hectograph blanket comprising gelatin, water, glycerine and a water soluble salt of a hydroxy acid. I
5. A hectograph blanket of such shape and flexibility as to be capable, when secured to 9.
flexible backing, of being wmmd into a roll and to a gelatinous duplicating mass comprising gelatin, water, glycerlne and a salt oi! a hydroxy acid.
8. A duplicating roll comprising a backing in the form of a flexible band, having secured thereto a gelatinous duplicating mass comprising gelatin, water, glycerine and sodium lactate.
9. A duplicating roll comprising a backing in the form of a flexible band, having secured there- 'to a gelatinous duplicating mass comprising gela tin, water, glycerine and an alkali metal salt 0! a hydroxy acid.
10. A hectograph composition comprising gelatin, water and a plasticizer including diethylene glycol and a water soluble salt of a hydroxy acid, the amount of water and plasticizer to gelatln being within approximately flve to twenty times the weight of the gelatin.
11. A hectograph composition comprising the following ingredients in the weight proportions stated: gelafln, 30, water, 45, sodium lactate. 100, diethylene glycol, 250.