US1890645A - Process of metallizing - Google Patents

Description

5 agents) and reducing agents are employed.

Patented Dec. 13, 1932 PATENT. o i-"Pica Max ow-ascmnenn, or VIENNA, Aus'mm' PROCESS OF ME'1'ALLIZING No Drawing. Application filed December 8, 1929, Serial No. 411,898, and in Austria'December 3, 1928.

i It isalready known to'firmly apply good" and the like or without adding to the mass 1 during the shaping of the articleto be metallized substances which at a later' stage render possible a metallization for instance 'y areducin process. 7

It has been found that the principle applied in the case of ebonite articles can be readily applied in the case of a large number of articles if suitable solvents (swelling However in all cases care has to be taken, that the massv of the articles to be metallized is slowly swelling-in the solvent of the reducing agent and the reducing agent is sutfi- 0 ciently soluble in the said solvent, but does not obstruct the swelling operation-of the article to be metallized and that, after dipping the article into the reducing solution and subsequently drying the same, the orig'i-I nal shape of the said article is' not changed inany way and the article retains the reduclng agent.

t has been found that in case of'a satisfac- 'quicklyand'dense as well as in such a thick layer on the material of the article, that it v is not necessary to subsequently increase the (Effect by galvanic treatment. By simple rubbingbef the metallized article, a high polish. lean imparted to the same.

' In case it isflnot desired to metallize the whole article, the places which'are not to be covered with metal are covered with a coat-;-

ing, which does not obstruct the processfof metallization, but is metallized and thus protects the part of the article below the same and can bp readily removed'withthe non-' required metal coating after the completion of the metallization with the result of sharp boundaries. Care has to be taken thatthe andin' certain cases also an asphalt-lac can be used.

The following materials are well adapted for metallizing the articles .formed therefrom 7 L Products of condensation ofcasein, for instance, with formaline, galalith; products of condensation of phenol, for instance with, formaline, bakelite, aswell as diverse mixed products. of which at least one component can sufficiently be swelled up in the suitable reduction solution.

Emample vering) the whole article, the part which ought to. remain free from metal are coated for instance with an acetyl cellulose lac.

Thecoat of lac is well metallized and can be readily removed by immersing the article 30 with the metal coating in water.

I'claim: 1. Process 'of 'metallizing articles of condensation products of casein and albumin, consisting in first cleaning the article of fatty substances; then immersing the article in a 3 to 4% aqueous solution ofhydroquinone; then drying the article-and placing'the same. in a reducible solution of a metallic salt, thereby precipitating'the metal.-

-2.' Process of metallizing-articles of condensation roducts of casein and albumin, consistingn first cleaning the article of fatty substances; then swelling byirhmersing the article. in an aqueous solution of h' droquinone; then drying the article and p acing the same in a reducible solution of a metallic. salt, thereby precipitating the metal.

In test mony whereof I aflix my signature.

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