US1783442A - Recording paper - Google Patents

Description

Dec. 2, 1930. c. w. MAYER ET AL 3 RECORDING PAPER Filed Feb. 4, 1928 INVENTORS O/zarlas W/Viz er 7ibcraiZi er a "W 7 ATTOR Y5 Patented Dec. 2, 1930 UNITED STATES PATENT OFFICE CHARLES W. MAYER AND EVERETT F. SILLER, OF ROCHESTER, NEW YORK RECORDING PAPER Application filed February 4, 1928. Serial No. 251,998.

This invention relates to recording paper.

It has for an object the preparation of a new sists of a paper base or stock preferably 001- ored, which is coated with a waxy compound transparent when liquid but translucent and preferably white when crystallized.

Further objects comprise the treatment of the surface so as to reduce susceptibility to abrasion under friction without affecting the sensitivity of the'paper for recording purposes and to remove tackiness or stickiness.

To these and other ends the invention resides in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification. l

In the drawings: v

Fig. 1 is a perspective View of a sample of the finished paper with a portion of the coating lifted to show the base, and

Fig. 2 is a section through the sample of the finished paper.

The recording or non-carbon paper forming the subject matter of this invention consists, as above indicated, of a paper base,

preferably covered, and covered by a compound transparent while liquid, but translucent and preferably white when crystallized. Characters may be recorded on the paper by primary or secondary impression or by heat, that is by mechanically displacing or compacting the coating as by a stylus or by impact of a typewriter key, or by rendering the coating locally transparent, for instance, by the use of localized heat. This allows the paper base to appear through the coating, the exposed portions of the base forming the desired characters.

One combination which has been successfully used by applicants is that of .a dark colored paper base with a coating thereon, formed of a mixture of a fatty acid and water-insoluble soaps, with a small amount of clay, and a suitable amount of volatile solvent, such as alcohol, gasoline, or carbon tetrachloride.

A specific example of such a compound is given in the following formula:

16 lbs. stearic acid, 1 lb. aluminum palmitate, 3 lbs-aluminum oleate, lb. clay, sufficient alcohol to give the desired consistency.

It will be understood that the proportions of the above formula may be varied considv erably to secure the desired characteristics of the finished product. For example, the aluminum oleate largely controls the sensitivity of the emulsion, and may be varied from one-half pound to five pounds to secure papers of varying sensitivity for different uses. The stearic acid is the base of this formula and is largely instrumental in securing the crystallized condition which makes the coating translucent. However, if used alone the 7 stearic acid forms large coarse crystals andthe aluminum palmitate is added to secure a .finer crystallization and also to raise the vis cosity of the melted compound. The clay is simply a filler and may be used in varlous amounts or eliminated altogether if desired. The volatile solvent is used as a means of controlling crystallization, and to reduce the mixture to a consistency that can be handled readily on any coating machine.

The use of variations of the above formula and the substitution of materials of equivalent properties are contemplated and intended to be covered by the claims appended hereto.

The pa er coated with the coating material may e used on recording instruments etc. but at this stage it is easily abraded by friction and is difficult to handle in quantity because of its sticky surface. In order to obviate this difliculty, applicants conceived the idea of coating the sensitized surface with an inert unctuous powder such as talc, and have found that this procedure entirely overcomes this difficulty, and moreover increases the whiteness of the film and affords general protection against atmospheric conditions.

After this finishing operation, the surface is entirely free from tackiness, and the resistanceto abrasion under friction in handling has been found to be very greatly increased without afiecting the sensitivity of the paper for recordinglpurposes.

To reca itulate, app 'cants pa r is provided witli a translucent crysta ed compound having a protected surface. The a plication of the coating and of the pow er may be done on any suitable coating and dusting machines.

Since the embodiment of the invention herein disclosed may be variously modified, and since other embodiments thereof might be made without departing from the essence of the invention, this disclosure is to be taken as illustrative only and not as limiting the sec e of the invention as pointed out in the claims appended hereto..

We claim as our invention:

1. A recording paper consisting of a deeply colored stock, covered with a waxy crystallized coating of contrasting color and an outer layer of inert powder.

2. A recording paper consisting of a dark paper base, covered with a compound comprising a crystallized mixture of a fatty acid and water-insoluble soaps, with a small amount of inert loading material, and coated with a thin layer of unctuous powder.

3. A recording paper consisting of a dark paper base, covered with a compound comprising a mixture of the following ingredients in approximately the following proportions stearic acid 16 aluminum palmitate 1 1b., aluminum oleate to 5 lb.

4. A recording paper consisting of a dark paper base, covered with a compound comprising a mixture of the following ingredients in approximately the following proportions: stearic acid 16 1b., aluminum palmitate 1 1b., aluminum oleate to 5 1b., clay 1b. and coated with an adherent layer of powdered talc or the like.

5. A recording paper comprising a paper base covered with a waxy crystallized coating of a color contrasting with the color of said base and an outer layer of inert powder.

CHARLES W. MAYER. EVERETT F. SILLER.

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