DE1419977A1 - Silver polish - Google Patents

Description

intended for
Disclosure

P .Vk 19 977

Deutsche Draekett Inc, Wilmington, fell, (V »8t. A.)

Silver polish

The invention relates to a silver polish that quickly tarnishes removed from silver objects that cleaned The surface is protected against renewed tarnishing by the deposition of a thin transparent layer and is easy to store.

US Pat. No. 2,658,199 discloses the use of thiourea in an acidic immersion cleaning agent for Silver and copper, U.S. Patent 2,691,593 Silver cleaning agent in the form of a paper or liquid. that is an abrasive, an emulsifier, a hydrocarbon as a carrier and, if desired, to improve the Glanzes contains a mercaptan or thiourea, and from the

New underlay (Art 711 ad »2 No. 1 sau 3 ^ Xn ^ tyngqp * v. 4. a 195 ,, 909805/0778

ÜSA-Patentsehriit 2 841.501 a silver polish, did a Abrasives as an anti-tarnish agent contains long-chain aikyloe'roaptan.

These silver cleaners and polishes are of considerable value. However, each vosa of them also has disadvantages. For example, it has been found that acidic dipping agents have a detrimental effect on silverware, possibly causing it to quickly form new tarnish when the silver is returned to normal use and possibly also wear away the surface of the silver itself. Obviously, the agent mainly has the effect of a cleaning agent that forms an insignificant or no protective coating at all. On the other hand, agents such as those described in US Pat. No. 2,691,593 are difficult to wash off from the silver after polishing ^{due to the content of a hydrophobic carrier 1 * and a new one is formed relatively quickly after the first cleaning.} Start-up layer.

Gagenstand the invention is a Silbar polish that one aqueous alkaline carrier and an abrasive and, if necessary.

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known additives such as thiourea and contains is marked that they are still 0.5 bi3 j5, ö # one low contains molecular dialkylthioureas.

The low molecular weight dialicyl thiophosphate is preferred Difflethylthiourea, Diethylthiohairiistoff, Diisopropylfchiofcar / fabric or bibuty! thiourea »It was found that these Vsi'bindimgen in aqueous alkaline silver polish ^ n a See cleaning and anti-start warning.

form them on the clean surface of the Silver a thin, transparent protective film, which is for a a considerable amount of time remains on the silver surface The appearance of the silver is not affected. This effect is unexpected and surprising, aa thiourea itself Silbar you do not criticize the formation of new start-up layers.

The Sehleifctel present in the silver polishing of the invention can for example charcoal. Chalk, polished red, tripoli, pumice stone, brick dust, pipe clay, yellow ocher, emery, Tripel »SilioiuiKdioxyd, sand, flint, Xnfusorerde, red lead, Be white lead and the like. These abrasives are in water tmoluble. As a precaution, a tone with a medium

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Particle size of about 1.% i, which is deeper than * # particles with a size greater than 5μ is used. The sound rauS not only consist of fine particles, but also be extraordinarily hard, for example a shepherdess between 7 and 9, based on the hardness value IO for diamond. Particularly suitable is a clay whose particles consist of flat There are leaflets.

The alkaline carrier can be prepared

by dissolving Matrlurr.hydroxya, Ooras, ammonia, tfatriutfbicarbonat or similar alkaline materials in water. The pH is preferably in the range from 8 to 11.

2Su the known additives * which are present in the silver polishing include surface-active agents that promote the foaming and rinsing properties of the silver polish, like diö non-ionic and anionic surface-active

modified sodium alkyl sulfate, Agents such as alkyl sulfates / non-ionic coconut Nut fatty acid alkanolamine condensates, non-ionic fatty acid condensate fatty acid esters, salts of fatty alcohol sulfates, polyoxyethylene sorbitol laurate and polyoxyethylene sorbitol ate laurate.

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Moisturizers such as propylene glycol, glycerine, ethylene glycol, agents that bind metal ions in complexes ₉ Pigpenta, perfume and soap, which improve the cleaning effect of the agent, can also be present. The soap contains an inhibitor of rancidity.

The proportions of the constituents of the silver polish of the invention can vary within fairly wide ranges, depending on whether the agent is to be used in the form of a cream or a paste. Usually it is most useful in the fora? a fairly viscous cream used. The basic additive set consists of about 30-80 $ aqueous alkaline carrier, 2-7-5% abrasives, about 0.5-2.0 $ diethyl, dimethyl, diisocyanate, bibutyl, thiourea. Preferred ranges are: about * JO-7O5S backing, $ 30-60 abrasives, and 1-1.5 % disubstituted thiourea. In addition, additives can be added in approximately the following amounts, the corresponding amounts of the supplementary composition. substitute:

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Surfactant 1 to 2

Fire holder (propylene glycol) 1 to 10

Metal complex binding

Medium OiOi to 1

Soap 6 to 12

Pigment 0.03 to 1

Parftim 0> 05 to 1

In the following examples 1 bia 4 3ilborpolituren, the Diaethyl, bat *. Diethyl, diisopropyl or dibutyl alcohol. etoff included, with means varied in different catfish compared. Example 5 illustrates the effect of the basic endorsement of example 1 without thiourea, in example 6 only thiourea is ver *; endefc. From visual 'exams of Silfcer spoons that have been polished by various means, This clearly shows the superiority of the agents which contain a disubstituted thiourea as defined above ^ in terms of their effect on the re-formation of Startup when the silver conditions are appropriate is exposed.

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Example J,

Ϊ. 35 Gg weight stalls ion as abrasive j of particles at least 95 $ a grain size of 5μ. cäsr below and not more than $ 0.01 have a grain size of more than 53μ (remain on a 300 mesh screen), with a hardness between 8 and 9 based on a scale on which Mafernnt has the hardness OK, and 0.10 parts of a "Ferrioxydpiptöütes ⁽ⁿ Kroma" Reä ^u) were stirred together to form a uniform mixture troökenen.

II 'In the case of tin nerfflperattir, a mixture of 7.3 parts Was3er and 1.5 parts anhydrous sodium carbonate

III 40.5 parts of water were heated to 6 ° C. and 3.0 parts of propylene glycol were 0.2 parts of Versene 100, a concentrated, straw-colored aqueous solution of the tetrasodium salt of ethylenediaminetetraacetic acid, 0.10 parts of thiourea and 1.5 parts of dimethyl thiourea added to the heated water. Then 9 parts of a soap powder with an actual soap content of $ 88, the remainder moisture, inhibitor for rancid and ash ("Amber Flakes ^{11 of} the Procter & Gamble Company) were sugesetst with stirring, so that

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a smooth, flowable liquid was created. The temperature of the mixture was imgsfkbr

IV. The soap solution from ίϊΐ. was under constant stirring added to the troubled Gemisah I so that a well-mixed, flowable paste was obtained. While stirring it had to be ensured that as little air as possible got into the mixture. .

V. The mixture XV was added to the mixture with constant stirring II added. The entire mixture was a relatively thick "paste"

VI. The paste V. was given 1.5 parts of Laurin-Kurealkanolamid ("Hyonics FS" by Nopco Chemical Company) as a surfactant Agent added. The mass was stirred until a paste that was creamy and homogeneous at room temperature was obtained. That Product became flowable when it reached a temperature of was heated.

Example 2

According to the same procedure and with the same ingredients as in Example 1, but using Dietbylthioham-

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fabric instead of diraethylthiourea became a polish manufactured. The polish was a cheeky one at room temperature, homogeneous paste.

Example 3

Using the same procedure and using the same ingredients as in Example 1, but using diisopropylthioherr substance instead of dimethyl thiourea for the mixture III. a polish was made. The polish was one at Creamy, homogeneous paste at room temperature.

Example 4

Following the same process and with the same components as in Example 1, but using dibutylthiourea instead of dimethylthiourea for mixture III. wux produced a polish. The polish was a creamy, homogeneous paste at the sizing temperature.

Example 5

Following the procedure and using the Bastand parts from Example 1, with port letting of the thioureas uwl des.

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disubstituted thioureas from the mixture HX. another polish was made. The polish was a convex, homogeneous paste at a temperature of 2 mm.

Example 6

Following the procedure and using the ingredients of Example i however, with the omission of the sulfated thiourea3 of the mixture ΪΙΙ. a polish was made. Bio polish was a kresaigö * üösnoganö Fa3te at room temperature.

The polishes of Examples i-6 were applied evenly to two types of silver in as similar a manner as possible. Two different types of silver spoons were used, as experience has shown that different silver goods manage somewhat differently in terms of the formation of tarnish layers. One sterling silver used was free from drawing, while the second had Towle's "Old Lace" pattern. The spoons were numbered with a diamond pen to make identification impossible. Then they were cleaned with an abrasive and water using a Schwerin, u «; Be sure to remove all sperms of chemicals from previous experiments that may have been left on the spoon.

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Air was cleaned by putting about 2 g of T polish on a damp sponge and over the spoon. "The spoon and soap were rinsed, and the cleaning was repeated once more. The spoons were in one instance yet einaal bit ^ as little as possible water rinsed and dried. in the second case let you polish on de "spoon dry and then polisrte with a dry" rich cloth. Bann were gesetat the spoon into a Behr frame vtxiu the whole frame with the spoons was Hydrogen sulfide was passed into the bell at a very low rate, measured with a bubble indicator. * The spoons remained under the bell for 45-60 minutes and were then removed.

The spoons were visually inspected using a good source of daylight. The results were as follows:

Example 1 - little tarnish difficult to determine Example 2 - little tarnish difficult to detect Example 3 - little start-up layer; difficult to determine Example 4 - little start-up layer - difficult to determine Example 5 - a long start-up layer Example 5 - strong start-up layer,

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When these experiments were repeated, a certain scheme resulted such, that the toughest tarnishing with those Spoons occurred that were the old of the polish from Example 6, the only contained thiourea itself, were purified. Thereon those who followed the polish of Example 5, the alkaline soap. With the rest of the spoons examined, i.e. those who were old cleaned of agents containing a low molecular weight dialkylthiourea contained, “the differences in the start-up layers are rare difficult to determine. At times, however, there was a visual; Difference between the tarnishing layers on silver that with was cleaned with the agents of Examples 1 and 2, and those on silver that was cleaned with the agents of Examples 3 and 4: was on.

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Claims (1)

H19977 - ι? - New patent claim Silver polish that contains an aqueous alkaline carrier and an abrasive as well as possibly known additives such as thiourea !, thereby
characterized in that it still contains 0.5 to 5, <# of a low molecular weight dialkylthiourea. BATH 909805/0778