utilized for grinding pbbma 750 gr was mixed with water 240 ml np 6 nonylphenol ethoxylate 1 ml and darvan l naphtalenesulfonic acid formaldehyde condensate sodium salt 30 gr the mixture was fed into the grinding beads mill over a period of 25 min the resulting slurry was stirred gently mechanical blade stirrer 40 60 rpm and 10 ml of 1 5 rhodopol 23 xanthan gum cas no 11138 66 2 in water with preserving agents 1 methyl paraben methyl 4 hydroxybenzoate cas no 99 76 3 and 0 5 propyl paraben propyl 4 hydroxybenzoate cas no 94 13 3 were added a suspension of antimony oxide was prepared as follows to a 3 liter round bottom flask fitted with a mechanical stirrer were added water 240 ml np 6 1 ml nonylphenol ethoxylate and darvan 1 naphtalenesulfonic acid formaldehyde condensate sodium salt 30 g finely ground antimony oxide ultrafine grade with typical average particle size of 0 2 u03bcm 0 4 u03bcm ao 750 g was slowly added under fast stirring 400 600 rpm the stirrer was slowed 50 150 rpm and a 1 5 solution of rhodopol 23 xanthan gum cas no 11138 66 2 with preserving agents u2014 1 methyl paraben methyl 4 hydroxybenzoate cas no 99 76 3 and 0 5 propyl paraben propyl 4 hydroxybenzoate cas no 94 13 3 were added 115 ml the mixed pbbma ao suspension was prepared as follows to a slowly stirred 40 rpm suspension of pbbma 750 ml at 25 u00b0 c 30 u00b0 c.