US1946508A

US1946508A - Antitarnishing material for silverware and other metals and process of producing the same

Info

Publication number: US1946508A
Application number: US579982A
Authority: US
Inventors: Arthur E Thurber; Raymond H Sholtz
Original assignee: ONEIDA COMMUNITY Ltd
Current assignee: ONEIDA COMMUNITY Ltd
Priority date: 1931-12-09
Filing date: 1931-12-09
Publication date: 1934-02-13
Anticipated expiration: 1951-02-13

Description

Patented eb. 13, 1934 UNITED STATES ANTITARNISHING MATERIAL FOR SILVER- WARE AND OTHER METALS AND PROCESS OF PRODUCING THE SAME Arthur E. Thurber and Raymond H. Sholtz, Sherrill, N. Y., assignors to Oneida Community,

Limited, Oneida, N. Y., a corporation of New York No Drawing. Application December 9, 1931,

Serial No. 579,982. Renewed May 12, 1933 10 Claims.

The present invention has for its objects, first, to provide a material which can be used in the ordinary ways for wrapping or otherwise enclosing articles consisting of or containing silver or other sensitive metal and which will also be inert or inactive as to any tarnishing effect in or on such articles and at the same time protect them against the tarnishing effects of the atmosphere, and, second, to provide a suitable process for the economical production of such material.

Many suggestions have heretofore been made looking towards the provision of such a material, some of them having to do with a material, such as paper, which is freeof injurious sulphur com- 16 pounds and others having to do with the impregnation of such material with certain metal salts and other substances for protecting the articles against the tarnishing effects of the atmosphere. Such a sulphur-free material, and more particu- 20 larly paper, is open to the objection that it is very costly to produce and that the processes used in its production often result in a loss of or reduction in the strength of the material, this being particularly true in the case of paper in the 2 form of sheets, pasteboard, cardboard, etc.

The present invention has to do with paper and other materials, in the manufacture or the bleaching of which sulphur compounds are used and which, as a result, are impregnated with injurious sulphur compounds which render them useless for wrapping or otherwise enclosing silverware or other tranishable metal articles unless these sulphur compounds be removed by chemical treatment, which'is costly and also objectionable because of the weakening of the material, particularly paper, or such sulphur compounds-be rendered inert or inactive as to effect, if this can be done effectively and without substantial additional cost of the final material or 4 the weakening of it in strength.

We have discovered that paper and other materials containing sulphur compounds can be treated so as to render their sulphur compounds inactive or inert as to tarnishing effect and that they may be so treated that the material will also protect the silver against the tamishing effects of the atmosphere, and that all this may be done without any substantial increase in-the cost of the material and without any loss of or reduction in its strength.

According to our present invention the sulphur compounds of the paper or other material are rendered inactive as to tarnishing effect by the addition of a soluble salt of copper (preferably copper sulphate) this addition having the effect of decomposing the injurious sulphur compounds of the paper or other material and precipitating the sulphur atoms in an inactive and inert form, the quantity of copper sulphate or other soluble copper compound used being, of course, sufficient for such decomposition and precipitation, and preferably in excess thereof for the purpose which will be hereinafter stated.

The paper or other material may be so treated for the decomposition of the injurious sulphur compounds and the precipitation of the sulphur atoms either during the process of manufacturing the paper or other material or after its manufacture has been completed. We prefer, however, that thetreatment should occur during the process of manufacture because it is more economical to do so and also because a better diffusion or dissemination of the soluble copper compound is possible than is possible if the treatment occur after completion of manufacture.

In the manufacture of non-tarnishing paper, pasterboard, cardboard and other materials, we

preferably add copper sulphate in suitable con-- centration to the paper while it is being manufactured, such addition, in the case of paper, being preferably made to the pulp while it is in the beater as this insures a more thorough mixing of the copper sulphate with the pulp and a longer time for the reaction between it and the sulphurcompounds in the pulp. We also prefer to maintain a temperature in excessof 130 Fahrenheit in the beater and, where a batch beater is use, to retain the pulp in the beater for at least one hour after the addition of the copper sulphate. The quantity of copper sulphate must, of course, be suflicient to decompose the injurious sulphur compounds present and precipitate the sulphur atoms in the paper and should preferably be in excess thereof to provide for a certain quantity of the copper sulphate in the finished paper to protect the silver or other metal articles against the tarnishing effects of the atmosphere; About fifty pounds per ton of finished paperstock have been found to be sufficient.

In the case of certain textile materials in the bleaching of which sulphur compounds are used, we prefer to add the copper sulphate to the materials during their manufacture for the reasons stated as to paper.

In the case of paper and other materials the addition of the copper sulphate or other soluble copper compound may be made in the finished paper or other materials, if desired, without departing from the present invention.

The anti-tarnishing paper, pasteboard, cardboard and the like, and the anti-tarnishing textile material may be used in many different forms and for many different purposes and the articles to be protected may also be in many different forms. For example, the paper, etc., and the textile material may be used as wrapping for the articles or as interleaves between sheets, nests or layers thereof such as sensitized photographic plates or films or as linings for chests or similar receptacles for the articles or as strips-in which to roll the articles or for the manufacture of boxes, bags, and other containers for the articles.

What we claim is:

1. As a new article of manufacture, paper or other material the sulphur compounds of which have been rendered inactive as to tarnishing effeet on silver or other tarnishable metals by the use of a soluble copper compound.

2. As a new article of manufacture, paper or other material the sulphur compounds of which have been rendered'inactive as to tarnishing effeet on silver or other tarnishable metals by the use of a soluble copper compound and which has an excess or such copper compound for protecting the silver or other metal against the tarnishing effects of the atmosphere. g

3. As a new article of manufacture, paper or other material the sulphur compounds of which have been rendered inactive as to tarnishing effect on silver or other tarnishable metals by the use of a copper sulphate.

4. As a new articleof manufacture, paper or other material the sulphur compoundsof "which .have been rendered inactive as to tarnishing effeet on silver or othertarnishable metals by the use of a copper sulphate and which has an excess of such copper sulphate for protecting the silver or other metal against the tarnishing effects of .the atmosphere.

5. The process of treating paper or other materials to render them non-tarnishing as to silver or other tarnishable metals which consists in rendering the sulphur compounds thereof inactive as to tarnishing by the addition of a soluble copper compound during the manufacture of the paper or other material.

6. The process of treating paper or other materials to render them non-tarnishing as to silver or other tarnishable metals which consists in rendering the sulphur compounds thereof inactive as to tarnishing by the addition of a copper sulphate during the manufacture of the paper or other material.

7. The process of treating paper, pasteboard, cardboard or the like to render it non-tarnishable as to silver or other tarnishable metals which consists in rendering the sulphur compounds thereof inactive as to tarnishing by the addition of a soluble copper compound to, the paper pulp.

8. The process of treating paper, pasteboard,.

cardboard or the like to render it non-tarnishable as to silver or other tarnishable metals which consists in rendering the sulphur compounds thereof inactive as to tarnishing by the addition of. copper sulphate to the paper pulp.

9. As a new article of manufacture, paper or other material containing a soluble copper compound for protecting silver or other sensitive metals against, the tarnishing effects of the atmosphere.

10. As a new article of manufacture, paper or other material containing copper sulphate for protecting silver or other sensitive metals against the tarnishing effects of the atmosphere.

- ARTHUR E. THURBER'. RAYMOND H. SHOLTZ.