12.03.13
US Patent No. 8,551,930 B2; Henkel AG & Co. KGaA, Duesseldorf, has patented a phosphate-free automatic dishwashing agent. It is comprised of a copolymer comprising at least one mono- or polyunsaturated carboxylic acid monomer, at least one mono- or polyunsaturated sulfonic acid monomer, and at least one additional nonionic monomer; an acrylic acid homopolymer; and at least one builder. The weight ratio of copolymer to homopolymer is between 10:1 and 1:3.