| 摘要 |
<p>455,771. Enamels. KREIDL, I., 5, Sebastian Kohlgasse, Vienna. May 7, 1936, No. 12964. Convention date, Sept. 25, 1935. [Class 56] Relates to the method of making white enamel in which the whiteness is due to the development of small gas bubbles by the decomposition of substances during the fixing process. According to the invention, the whiteness is increased by the addition of compounds of iron, antimony, cerium, uranium, or arsenic, particularly the oxides, to the enamel. The oxide is added in such a small quantity that the total quantity in the enamel does not exceed 1 per cent. For example, 1000 grammes of enamel, 500 grammes of water, 0À25 grammes of benzidine, 4 grammes of uranium oxide, and 100 grammes of clay are ground in the mill and then applied and fired in the usual manner. Examples of other suitable mixtures are given in the Specification. The oxide may be chosen to have a decolourizing action when the substance used for the development of the clouding gas has a colouring action. The method is particularly suitable for use with frits having enhanced colloidal properties produced, for example, by raising the fluorine content.</p> |
