US1234045A

US1234045A - Waterproof writing-paper for metallic styli.

Info

Publication number: US1234045A
Authority: US
Inventors: Shingo Kuroki
Original assignee: KIMPITSU SEISHI Ltd KK
Current assignee: KIMPITSU SEISHI Ltd KK
Priority date: 1917-01-23
Filing date: 1917-01-23
Publication date: 1917-07-17
Anticipated expiration: 1934-07-17

Description

SHINGO KUROKI, OF TOKYO, JAPAN, ASSIGNOR T0 KIMPI'ISU SEISHI KAISHA, L'JND., 0F TOKYO, JAN.

WATERPROOF WRITING-PAPER FOR METALLIC STYLE.

No Drawing.

To all whom it may concern:

Be it known that I, SHINGO KURoKI, a subject of the Emperor of Japan, residing at Tokyo, Japan, have invented certain new and useful Improvements in Waterproof Writing-Paper for Metallic Styli, of which the following is a specification.

The present invention relates to Water proof writing paper; and it comprehends, briefly, certain improvements, hereinafter fully described, in the preparation and treatment, from a chemical standpoint, of the paper whereon the writingor marking is to be made, whereby such paper is rendered suitable for use in connection with metallic styli, the object of the invention being to obviate defects ordinarily existing in the uusal methods of writing in which pens and ink or pencils are employed.

According to the invention, the paper to be used is subjected to successive treatments with various chemical substances, with the result that a writing surface is formed thereon, on which marks made by a metal stylus are readily and permanently legible, such marks having a sharp or clear appearance which does not change color nor fade with time, nor smudge, and being of uniform color, as opposed to the diflerent degrees of shade or color appearing in ordinary ink or pencil writing. Also, the paper itself maintains its original whiteness or color, and does not blacken with age.

In carrying out the invention, the sheets of paper to be used are first treated with a dilute solution of gum arabic, which is sprayed over either or both surfaces thereof in any desired manner and with the aid of any suitable device. Powdered white clay, which maycontain a certain amount of fine, hard sand, is then scattered uniformly over the surface or surfaces of the paper; and after the surplus powder has been removed, a mixture composed of two parts, by volume, of castor oil one part of benzene and one part of vaselme, is applied thereto by means of a roller.

Oxidized zinc in powdered form may, if

desired, bemixed in equal quantities with the powdered clay, to sharpen or render more clear the marks written upon the paper; and half a part, by volume, of camphor oilmay be added to the above mixture of oils for the purpose of eliminating the odor thereof.

Specification of Letters Patent.

Application tiled January 28, 1917. Serial No. 1449M Patented nllly It, III,

Writing is Perfore.m e sa y upon the paper and at the P etion of t e writing operation, the letters, characters or other marks will be found to have a clear and sharp appearance, and a uniform shade or color which will not fade out with age, as previously stated; while the paper likewise tends to keep its original color.

These improved results are due primarily to the use both of the powdered white clay in place of the white paint more commonly utilized, and of the non-drying castor oil instead of the drying oil usuaily employed as a solvent for the paint, because of the fact that the white lead contained in the paint has the tendency to oxidize in time and thus turn the paper black, while a part of the drying oil gradually evaporates and thus lessens the smoothness of the writing surface, in consequence whereof the movement of the stylus thereover is impeded. 0n the other hand, the clay used according to the present invention does not become oxidized, and hence, does not tend to blacken the pa: per, and the castor oil produces no such roughening or hardening of the writing surface as'does the more generally used drying oil. It is important, however, to apply the powdered clay to the paper in the manner described above, before commencing with the oil treatment, for if the clay and oils were all mixed together and then applied by means of a roller or the like to the paper, the clay might form separate deposits which would impair. the smoothness of the writing surface. Furthermore, it is desirable to. add both the benzene or other volatile oil and the Vaseline mentioned above to the nondrying oil, since the latter, if used alone, could not be satisfactorily applied as a coating for the writing surface.

While it is essential to the invention to apply the powdered clay to the paper before the latter is treated with the oil mixture, yet it is possible to incorporate the powder in the pulp during the manufacture of the paper, instead of dustin it on a finished sheet of paper coated wit gum arabic or other adhesive. Indeed, the incorporation of the powder in the pulp is, in one respect at least, preferable to the firstmentioned mode of application, since paper so prepared may again be written on after writing previously made thereon has been rubbed out by means of an eraser; whereas it is practically impossible to obtain shar dark writing on paper which 1s mere y coated with the powder, after having rubbed out the previous writing, due to the fact that the passage of the eraser over the wr1ting surface necessarily has the effect of rea I moving some of the powder.

I claim as my invention- 1. The herein-described process of manufacturing writing paper for metallic styli,

which consists in treating paper material 7 with powdered clay;- and thereafter coating it with a' mixture composed of a nondrying oil, a volatile oil and vaseline.

2. The herein-described process of manuwith powdered clay; and thereafter coating it with a mixture composed of castor oil, a volatile oil and vaseline.

4. The herein-described process of manufacturing writing paper for metallic styli,

which consists in treating paper material with powdered clay; and thereafter coating it with a mixture composed of castor oil,

benzene and vaseline.

5. The herein-described process of manufacturing writing paper for metallic styli, which consists in treating paper material with powdered clay; and thereafter coating it with a], mixture composed of a non-drying oil, a volatile oil, vaseline and a deodorizing substance.

6. The herein-described process of manufacturing writing paper for metallic styli,

which consists in treating aper material with powdered clay; and tliereafter coating it with a mixture composed of a nondrying oil, a volatile oil, vaseline and camphor, oil'. g r

7. The herein-described process of manufacturing writing paper for metallic styli, which consists in treating paper material with a mixture of powdered clay and zinc oxid; and thereafter coating it with a mixture composed of a non-drying oil, a volatile oil and vaseline.

8. The herein-described process of manufacturing writing paper for metallic styli, which consists in treating pa er material with a mixture of powdered c ay and zinc oxid; and thereafter coating it with a mixture composed of a non-dryin oil, a volatile oil, vaseline and a doc orizing substance. 4

9. The herein-described process of manufacturing writing paper for metallic styli, which consists in treating paper material with a mixture of powdered clay and zinc oxid; and thereafter coating it with a mixture composed of castor oil, benzene and vaseline.

10. The herein-described process of manufacturing writing paper for metallic styli, which consists in treating paper material with a mixture of powdered clay and zinc oxid; and thereafter coating it with a mixture composed of castor oil, benzene, vaseline and a deodorizing substance.

In testimony whereof I aflix my signature in presence of two witnesses.

SHINGO KUROKI.