| 摘要 |
546,015. Casein paints. STEVENS, A. H. (Borden Co.). June 5, 1940, No. 9877. [Class 95] A dry paint, to be mixed with water when required for use, is made by mixing a pigment with a solution of water-soluble casein containing sufficient casein to act as the binder for the pigment, and thereafter drying the mixture. About 10-20 per cent. of casein on the weight of pigment is usually employed, and this is dissolved in water by the addition of an alkali such as ammonium hydroxide, tripotassium phosphate, sodium borate, trisodium phosphate, disodium phosphate, caustic soda, caustic potash, sodium aluminate, and sodium, potassium, or ammonium carbonate. Specified pigments are titanium white,' clay and tale. Specified optional additions are hydrated lime, potassium dichromate, and a foam-reducing agent, such as pine oil. Various shades of' paint may be made by making two or more white paint bases. of different casein content and subsequently blending proper quantities of these different bases with a desired amount of colour to produce a paint having a suitable casein content and the desired shade of colour. Specification 312,061, [CLass 95], is referred to.
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