| abstract |
DRY, FREE-FLOWING POWDERS HAVING LITTLE OR NO ELECTROSTATIC CHARGE REACTION AND SUBSTANTIALLY FREE FROM WEBBEING ARE OBTAINED BY A PROESS WHICH COMPRISES THE STEPS OF: (1) PREPARING AN ACETONE SOLUTION OF AN ACRYLIC POLYMER, WHICH SOLUTION HAS A VISCOSITY OF LESS THAN ABOUT 13 SECONDS ($4 FORD CUP) AND THE RATIO OF ACETONE TO OTHER ORGANIC SOLVENTS IS AT LAST 3, (2) ADDING TO THE PRODUCT OF STEP (1) FROM 3 TO ABOUT 10 PERCENT ATER, BASED ON THE VOLUME OF ACETONE EMPLOYED, AND (3) SPRAY-DRYING THE PRODUCT OF STEP (2). THE POWDERS THUS OBTAINED ARE USEFUL AS COATING POWDER COMPOSITIONS WHICH CAN BE APPLIED BY EITHER ELECRROSTATIC SPRAYING OR FLUIDIZED BEADS, WITH EXCELLENT RESULTS. |