US2163934A - Copy sheet - Google Patents

Description

Patented Jo o 21, 1939 UNITED STATES 2,183,934 cor! snna'r Howard E. Collins, La Grange; alslgnor to Ditto, Incorporated, Chicago, Ill., a corporation of West -No Drawing. Application March 5, 1938, Serial No liiidlt 11 Claims. '(0i. 41-413) This invention relates to an improvement i copy sheets and more particularly to master cop sheets, adapted to give designs of higher col intensity in a duplicatingprocess wherein a de- 5 sign to be reproduced is applied to a master copy ,sheet by typewriting and the like, the design on. the master copy sheet contacted with a duplicat ing' mass, and copies madeby. contacting copy sheets in succession with the design on the 10 duplicating mass.

In the usual ,hectograph duplicating process a g a design formed of a water and glycerin soluble dye is applied to an ordinary paper sheet such as bontLpaper to form a master copy. The de-- sign on the mastercopy is then contacted with a duplicating mass consisting of gelatin, glycerin *and water, whereupon the dye of the design is largely transferred to the hectograph mass, form- 2 ing a reverse image of the design. Copies are then made by contacting copy sheets withthe design on the'hectograph mass. Where the dye used in forming the. designs is not'readily soluble v in water and glycerin, the colol'-oi the design on 5' the copies is of poor intensity after only a few copies have been made. This is particularly true of black basic nigrosine, and also of highly light absorbent combinations of basic as the mixtures of fuchine and malachite green in the proportion of 1:2. I

In accordance with this inventicnthere is distributed on the surface of a copy sheet a glycerin miscible solvent which has a greater solvent a power thanglycerin for basic nigrosine and other like transfer dyes. One.embodi'ment oi the invention is a paper copy sheet having a coating of a relatively nonvolatile solventselected from the group consisting 0!: 11011101038 of Cellbsolve (ethylene glycol ethyl ether) and Oarbitol" (di-ethylene glycol V ethyl ether). 7 The solvent may be applied to the paper sheet and bound thereto by any suitable means known 45 to the art. It may be incorporated with the pulp during the process of manufacture of the 1 paper so that the finished paper the solvent 'uniforrnly'distributed in it. It may also be applied to a paperv sheet coated with-some with otherfconstituents.

the invention:

122" sheetof paper.

'flve intense black .copies could be produced in A The following examples are 'given to Example 1 Asheet of sulphite bond paper 1 7" l): 22"} is coated with the" following composition:

Dimethoxytetra glycol (dimethyl etherof a tetra ethylene glycol) cc Water m Starch 'grams-- 3 The amount of coating is 0.8 gram 1 ",x

A design was produced on this'coated copy sheet by typing, using a black carbon paper con-V taininga basic nigrosine dye. This sheet containing the black 'dye design was then applied P to a hectograph blanket ofthe ordinary im consisting, for example. of glue or gelatin, 30 parts by weight, water, parts and glycerin 300 parts, whereupon the-black dye of the'design was largely transferred to the hectograph mass.

Copies were then produced from-the hectogrsphfl mmass in the'conventional manner without application of any solvent or resort to any special procedure.- It was found that atleast thirtythis manner. as

M Exam A sheet of paperwas coated with the following composition; Butyl carbitol (di-ethylene glycol butyl 30 ether) v ca 10 Wa a 1 Gelatin grams" -3 Kaolin go 10 Adesignwasproducedonthissheetbytyping.

using a carbon paper con ning a mixture of iuchsin and malachite green in proportions of 1:2. The sheet containing the design was then used to obtain copies by the ordinary hectograph process. Similar results as for Example 1 were While has been shown and described certain, embodiments of the invention, it-is to be understood that it is capable of many modifications. Changes-in the proportions, and suhsti'tu-j tion of equivalent materials may be made without departing from the spirit and scope of the" in view or the prior art.

I claim: r

V 1.Theprocess.of reprod' "comprises applying a design formed of a soluble ng tdesigns which dye'toasheethavinguhiiormlydiltrihutedcn its surface a glycerin miscible solvent having a greater solvent power than glycerin for said dye, and contacting the. design on said sheet with a hectograph copy mass to transfer the design to said mass.

2. The process of reproducing designs which comprises applying a design formed of a basic -nigrosine dye to the surface of a sheet containing on its surface a glycerin miscible solvent having a greater solvent power than glycerin for said basic nigrosine dye, contacting the design on said sheet with a copy pad to transfer the design to said pad, and contacting a copy sheet with the copy pad to transfer the design to said .copy sheet.

3. A copy sheet having distributed on its's'urface a composition comprising a dye solvent and an absorbent substance adapted to retain the dye solvent at the surface of the sheet, said dye 4 remain in the sheet over a prolonged period of solvent'being of sufliciently low volatility as to time under normal conditions, of greater solvent power than glycerin, and soluble in glycerin and the surface of'the sheet.

6. A copy sheet having distributed on its surglycol and an absorbent substance adapted to reface apcompositioncomprising di-methoxytetra tain the di-methoxytetra glycol at the surface of the sheet.

7'. A. copy sheet having distributed on its surface a composition pomprising di-ethylene glycol butyl ether, gelatin, and an absorbent clay.

8. A copy sheet having distributed on its surface a composition comprising di-methoxytetra glycol and starch.

9. The process-of reproducing designs which comprises applying a design formed of a water or alcohol soluble dye to a sheet having uniformly distributed on its surface a composition comprising a solvent from the group consisting of ethers of glycols d polyglycols, contacting the design on said she t with a copy pad to transfer the design to said pad, and contacting a copy sheet with the copy pad to transfer the design to said copy sheet.

10. The process of reproducing designs which comprises applying a design formed of a water or alcohol soluble dye to a sheet having uniformly distributed on its surface a composition comprising di-ethylene glycol butyl ether, contacting the design on said sheet with acopy pad to transfer the'design to said pad, and contacting a copy sheet with the copy pad to transfer the design to said copy sheet.

11. The process of reproducing designs which comprises applying a design formed of a water 'oralcohol soluble dye to a sheet having'uniformly distributed on its surface a composition comprising di-methoxytetra glycol, contactin .the design on said sheet with a copy pad to transfer the design to said pad, and contacting a copy sheet with the copy pad to transfer the design to said copysheet.

. HOWARD E. COLLINS.