US2039068A - Rubber adherent article - Google Patents

Description

E. C. DOMM RUBBER ADHERENT ARTICLE Filed July 19, 1935 rubber coccizig arsenic or arzf'ma zy im, cadmium, Zara I 07 ZeaaZ 3% 7 7 0 as 1) case dill attains acumen annrnen'r an'ricm lEigin @arleton .lllvomm, Niles, Mich, assignor to National-Standard ilompany, Niles, li/lich, a corporation of .Wllichigan Application .llnly 19, I935, sen-all No. 32.2w

I3 oral-1m (or. till-68.2)

This invention relates to a rubber-adherent article and, more particularly, to a method of increasing the adherence to rubberor corrosionresistant ferrous base articles.

This application is a continuation, in part, of my co-pending applications, Ser. No. 665,425, filed April 10, 1933, and Serial No. 737,666, filed July i934, and Serial No. 749,304, filed October 20,

As set forth in the latter application, I have discovered that the adhesiveness to rubber of zinc may be increased by coating the zinc with a thin layer of copper, and then alloying thecopper with the zinc in the cold, or under the mild heat of vulcanization, to produce a'thin layer of brass.

its was also set forth in that application, the adherence of cadmium, tin and lead to rubber may be increased in the same manner.

It has now been discovered that the adherence of zinc, cadmium, tin and lead may be increased with respect to rubber by plating thereon a thin layer of a metal of the class consisting of antimony and arsenic.

While neither arsenic norantirnony has great adherence to rubber, the thin layer apparently alloys throughout, or at least is chemically affected by the zinc in such manner that the resultant product has greater adherencethan either zinc or antimony alone. 1

In carrying out the invention, the base which has been coated with zinc, cadmium, lead or tin is plated with arsenic or antimony either by electro deposition or by electroplating. In the case of steel tire bead reinforcing wires, the base coat is preferably of galvanized zinc and the arsenic or antimony is applied thereto.

In the case of arsenic, the coating is preferably I16 to .021 gram per kilogram, having a diameter ill til

of .037 inch. The preferred range is .066 to .lli gram per kilogram.

In the case of antimony, the preferred coating is from bite .35 gram per kilogram.

The coatings are in the order of .000001 to .llildilod inch in thickness.

In plating the arsenic or antimony, a bath such as those disclosed in my co-pending applications Ser. No. 720,891, Serial No. 706,737 and Serial No. 706,736 may be used, and the metals plated by electrodeposition from such a bath. On the other hand, they may be plated by electroplating of the ordinary form. Following the plating, it is preferred'to dip the articles in hot water and dry them so that they may be rapidly dried.

Such a bath, in the case of antimony, consists of 3 ounces of sodium cyanide in one gallon of warm water in which A, ounce of antimony trisulfide is dissolved, and which is then heated to 120 F. The solution is preferably maintained at about this temperature during the reaction.

In the case of arsenic, solutions may be pre- 5 pared from the respective trisulfides in substantially the same molecular proportions shown for the antimony trisulflde.

After plating, the articles are covered with a coating of rubber which isvulcanized throughout.

v The invention is illustrated diagrammatically in the drawing. It is understood that the thicknesses shown. in the drawing are. not properly illustrative of the true relative thicknesses, but 5 are shown purely for the purpose of illustration.

The term electrodeposition as used in the claims, covers electrodeposition either by the use of an electric current or simply the substitution of one metal by another.

The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations should be understood therefrom, but the appended claims should be construed as broadly as permissible, in view oi. the prior art.

What I claim as new, and desire to secure by Letters Patent, is:

l. The method of attaching an article coated with metal of the class consisting of zinc, cadmiurn, tin and lead to rubber, which comprises applying to such coating a thin layer of metal of the class consisting of arsenic and antimony,

the layer being thin enough to alloy throughout with the underlying metal and produce a thin layer of alloy thereon, whereby the adhesiveness to rubber is increased, and vulcanizing a layer'of rubber thereto.

2. The method of attaching a ferrous base metal object having a coating of a metal of the class consisting of zinc, cadmium, tin and lead thereon to rubber, which comprises applying to such coating a thin layer of metal of the class consisting of arsenic and antimony, the layer be- 5 15 3 thin layer of a metal of the class consisting of metal of the class consisting of arsenic and antimonythereon, the overlying metal layer being of a thinness to alloy throughout with the underlying metal and produce a thin .layer of. alloy thereon, and a rubber coating vulcanized thereto.

6. A steel tire bead reinforcing wire having thereon a galvanized 'zinc coating, and having a arsenic and antimony thereon, said layer being of a thinness to alloy throughout .with the zinc,

and produce a thin layer of alloy thereon, and a coating of rubber vulcanized thereto.

7. The method as set forth in claim 1, in which the arsenic or antimony is applied by electrodeposition.

8. An articleas set forth in claim 4, in which the arsenic or antimony layer is an electrodeposited layer.

9. The method as set forth in claim 1, in which the first coating is of zinc.

10. The method as set forth in claim 1, in which the coating of arsenic and antimony are of the order of .000001 to ,000004 inch in thickness.

11. Anarticle as set forth in claim 4, in which the thickness of the arsenic or antimony is of the order of .000001 to .000004 inch.

12. An article as set forth in claim 4, in which the outer metal coating is of arsenic.

13. An article as set forth in claim, 4, in which the outer metal coatingis of antimony.

'ELGIN CARLE'ION DOMM.

Images