Patent ID: 6521576
Filing Date: 2003-02-18
Classification: C11D

Abstract:
A dishwashing composition effective for cleaning glassware in hard water, the dishwashing composition comprising:(a) a hydrophobically modified polycarboxylic acid; and (b) a water soluble polymer that reduces phosphate scale formation; wherein said polycarboxylic acid (a) comprises at least one structural unit selected from the group consisting of: wherein each R1 and R2 are independently a hydrogen, aryl, C1-20 alkyl, C2-20 alkenyl, or a C2-20 alkynyl group; wherein t is an integer from about 0 to about 2,000, a is an integer from about 0 to about 2,000, t&gE;1, a&gE;1, a is an integer that is from about 80% to 100% of t, n=0, z=1, at least two R1 groups are carboxylic acid groups or salts thereof, and at least one R2 group is C4-C20 alkyl or C8-C30 ethoxylated condensate of an aliphatic group; and wherein said water soluble polymer (b) has a polymer backbone has a polymer backbone comprising at least one structural unit derived from a monomer having the formula: wherein R1 is a group comprising at least one sp2 bond, Z is O, A is a mono- or a polycyclic aromatic group or an aliphatic group and each t is independently 0 or 1 and B+ is a monovalent cation.