| abstract |
Method of manufacturing a powder or granule containing (A) in the range of 80 to 99% by weight of at least one chelating agent selected from diacetic acid methylglycine (MGDA) and glutamic acid diacetate (GLDA) and iminodisuccinic acid (IDS ) and their respective alkali metal salts, (B) in the range of 1 to 20% by weight of at least one homo or copolymer of (meth) acrylic acid, partially or totally neutralized with alkali, said homo or copolymer (B) with an average molecular weight Mw in the range of 1,200 to 30,000 g / mol, determined by gel permeation chromatography and referring to the respective free acid, percentages that refer to the solids content of said powder or granule, said procedure comprises the steps of (a) mixing the at least one chelating agent (A) and the at least one homo- or copolymer (B) in the presence of water, (b) removing most of said water by spray drying or spray granulation using a gas with a tempe Inlet rate of at least 125 ° C. |