DE16413C - Process for the production of artificial ivory by means of shellac, zinc oxide and ammonia - Google Patents

Description

IMPERIAL

PATENT OFFICE.

In the manufacture of articles made of artificial ivory, there has been the largest so far Difficulty in obtaining the necessary strength of the article, the application a very large percentage of a binding substance deemed indispensable. That The result of this was that the manufactured goods acquired an impure color, whereby their value and their usefulness in making articles that should be pure white was decreased.

By means of my invention, I am producing an article with only a very small one Percentage of rubber or other binding substance is used, which is nevertheless completely sufficient for the particles of the inactive substance, so that the finished material is a pure white color and used to manufacture articles of all kinds, usually made of ivory or the like Substances are produced, suitable.

These results are achieved by using a suitable dissolving agent in which the binding substance is dissolved. The inactive substance is then added to the solution and the mixture thus obtained is ground; then the solvent is eliminated and the mass · then again milled in the dry state best to turn them into a fine powder. The powder produced in this way is introduced into the molds or dies of suitable construction and then subjected to the action of heat and strong pressure.

Under the term "inactive substance" as used in this description, I understand any substance that is not fusible under the influence of heat and which can be effectively comminuted by the means indicated. With preference i use. to this zinc oxide.

The binding substance can consist of any material which is known in its nature is similar to vegetable adhesives; I prefer, however, shellac or a to use similar vegetable glue.

The dissolving agent can be selected depending on the circumstances; the properties that should have the same, as well as the quantity to be used must depend on the given circumstances are determined and depend on the nature of the binding substance as well as other circumstances. I have favorable results achieved with the use of ammonia water as described below, however other non-ammonia disintegrants can also be used if desired contain.

The method I use in carrying out my invention is this the following:

First I prepare a solution consisting of 8 parts of shellac and 32 parts of ammonia of about 0.995 specific gravity.

These ingredients are placed in a rotating cylinder and shaken continuously for about five hours, the temperature being kept as close as possible to 37 ± ₂ °. After this time has elapsed

a complete dissolution of the substances has occurred.

The solution produced in this way has about the consistency of a thin syrup. '-

I now put a suitable quantity in a suitable vessel and then set something like that 40 parts zinc oxide of good quality by stirring it in and by hand, mix as much as possible. After the addition of the zinc oxide, the solution consists of eight parts Shellac, 32 parts ammonia water and 40 parts zinc oxide. The quantity of zinc oxide however, a little larger or smaller can also be chosen, without therefore a less favorable result would be achieved; the same is true with relation to the other components.

After the shellac, ammonia water and zinc oxide are mixed in this way the mixture is placed in a paint mill and grinded completely.

The next step is the elimination of the ammonia water, which is now the Has done what it was meant to do. This is best done by means of evaporation Heat reached. For this purpose, the mixture is dried on glass plates so that a as complete drying as possible is achieved. It is beneficial that the mixture persists to be left exposed to the air, since complete expulsion without this precautionary measure the humidity would be very difficult to reach.

After the dehydration is effected, only zinc oxide and shellac remain as those Substances from which the article is to be made; they are complete dry and in such a condition that it is inserted into the mold and the article in the can be completed in the manner described below. However, to get an article from of unusual perfection, I do not put the dried mass in immediately the shape, but grind it again in a completely dry mill of a suitable size Construction, which turns it into a fine flour. It is in this state the mass is ready to be inserted into the mold.

The shapes can be of any construction and the degree of heat and pressure chosen as usual. The pressure can therefore be around 160 kg per square centimeter and the heat 125 to 137 V ₂ ° or, depending on the circumstances, a little more or less.

If you want to color the article, you can either go in front, as you wish the first grinding a coloring material or pigment into the solution, or before the second Add the grind to the dried mass.

If one wishes to employ some other inactive substance instead of the zinc oxide, so the latter is simply replaced by the other substance which is preferred, without from the procedure described with reference to the use of zinc oxide in others Way to deviate; the quantity of inactive substance in relation to the others Ingredients, however, should be changed depending on their specific gravity.

It can be seen that the invention allows various modifications up to certain limits, both in the choice of the substances to be used and in the proportions, in which they can be used, and in certain parts of the process.

Claims (2)

Patent Claims: 1. The procedure described above, Article to form from an inactive mass (zinc oxide) and a binding substance (shellac), which consists in a) the inactive material and the binding substance in the proportions given to combine with a solvent (ammonia water), b) to grind the mixture thus produced, c) to dry the solid components of the mixture, and d) to compress the dried ingredients in heated molds. 2. The method described above, articles made from an inactive mass (zinc oxide) and to form a binding substance (shellac), which consists of a) the inactive material and a binding agent in the proportions given to combine with a solvent (ammonia water), b) to grind the mixture thus produced, c) to dry the solid components of the mixture, d) to grind the dried components again in a dry state, and e) from the powder thus obtained, the article is heated by compression Making shapes.