POWDER AND GRANULE, PROCESS FOR MAKING SUCH POWDER AND GRANULE, AND USE THEREOF

摘要

The present invention is directed towards a process for making a powder or granule containing (A) at least one chelating agent selected from methyl glycine diacetic acid (MGDA) and glutamic acid diacetate (GLDA) and iminodisuccinic acid (IDS) and their respective alkali metal salts, (B) at least one homo- or copolymer of (meth)acrylic acid, partially or fully neutralized with alkali, said process comprising 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 an inlet temperature of at least 125° C.

主权项

1: A process for making a powder or granule containing
(A) in the range of from 80 to 99% by weight of at least one chelating agent selected from the group consisting of methyl glycine diacetic acid (MGDA), glutamic acid diacetate (GLDA), iminodisuccinic acid (IDS) and their respective alkali metal salts, (B) in the range of from 1 to 20% by weight of at least one homo- or copolymer of(meth)acrylic acid, partially or fully neutralized with alkali, said homo- or copolymer (B) having an average molecular weight Mw in the range of from 1,200 to 30,000 g/mol, determined by gel permeation chromatography and referring to the respective free acid, percentages referring to the solids content of said powder or granule,the process comprising:
(a) mixing the at least one chelating agent (A) and the at least one homo- or copolymer (B) the presence of water; and (b) removing most of said water by spray-drying or spray granulation using a gas with an inlet temperature of at least 125° C.