| 摘要 |
1471123 Granular salts of substituted or unsubstituted polyalphahydroxyacrylic acid SOLVAY & CIE 10 July 1975 [11 July 1974] 29064/75 Heading C3P Granular alkali metal- or ammonium salts of poly-alpha hydroxy acrylic acid or its substituted derivatives are produced by forming a fluidized bed of solid particles of the desired salt which are smaller than the desired granules, and spraying said bed with a solution of the same salt, the solution acting as a binder to agglomerate the smaller particles, the process being effected at a temperature which ensures rapid evaporation of the solvent used. The resultant granules have an apparent specific gravity under free flow of 0À35 to 0À55 kg./dm.<SP>3</SP> (measured by a defined method similar to that of ASTM D 392-38 and ASTM B 212-48), and have a flowability of not greater than 10 seconds. The flowability is the time taken for 250 g. of the granules to flow through the 16 mm. diameter orifice of a short-stemmed funnel of specified geometry. |
