Patent ID: 8303721

Claim:
A phosphate-free automatic dishwashing agent, comprising a builder, a bleaching agent, and: a) a copolymer comprising: i) acrylic acid monomer; ii) a monomer of the general formula R 1 (R 2 )C═C(R 3 )—X—R 4 , in which R 1 and R 2 are —H, R 3 is —H or —CH 3 , X is —C(O)O—, and R 4 denotes a straight-chain or branched saturated alkyl residue with 2 to 22 carbon atoms or denotes an unsaturated, optionally aromatic residue with 6 to 22 carbon atoms; and iii) a monomer comprising a sulfonic acid group selected from the group consisting of 1-acrylamido-1-propanesulfonic acid, 2-acrylamido-2-propanesulfonic acid, 2-acrylamido-2-methyl-1-propanesulfonic acid, and 2-methacrylamido-2-methyl-1-propanesulfonic acid; and b) a nonionic surfactant of the general formula R 1 —CH(OH)CH 2 O-(AO) w -(A′O) x -(A″O) y -(A′″O) z —R 2 , in which R 1 denotes a straight-chain or branched, saturated or mono- or polyunsaturated C 6-24 alkyl or alkenyl residue; R 2 denotes a linear or branched hydrocarbon residue with 2 to 26 carbon atoms; A, A′, A″ and A′″ mutually independently denote a residue which is selected from —CH 2 CH 2 , —CH 2 CH 2 —CH 2 , —CH 2 —CH(CH 3 ), —CH 2 —CH 2 —CH 2 —CH 2 , —CH 2 —CH(CH 3 )—CH 2 —, and —CH 2 —CH(CH 2 —CH 3 ), w, x, y and z denote values between 0.5 and 120, wherein x, y and/or z may also be 0.