ALKALINE DETERGENT COMPOSITION CONTAINING A CARBOXYLIC ACID/POLYALKYLENE OXIDE COPOLYMER FOR HARD WATER SCALE CONTROL

摘要

An alkaline detergent is described which includes the use of a copolymer in combination with an alkali metal hydroxide. The detergent maintains cleaning functions and also prevents hard water scaling, for example at application temperatures of between 145-180 degrees Fahrenheit and with a pH of 9.5 to about 13.

主权项

1. A detergent composition for hard water scale control comprising:
at least about 50 wt-% of alkali metal hydroxide; and at least one copolymer (A) comprising the following monomers in copolymerized form:  from about 30 to 95% by weight of at least one monoethylenically unsaturated C3-C8-carboxylic acid, or an anhydride or salt thereof, and from about 5 to 70% by weight of at least one nonionic monomer of the formula I
H2C═C(R1)(CH2)xO[R2—O]yR3  (I)  in which R1 is hydrogen or methyl, R2 are identical or different, linear or branched C2-C6-alkylene wherein R2—O may be arranged in blocks or randomly, and R3 is hydrogen or a straight-chain or branched C1-C4-alkyl, x is 0, 1 or 2 and y is a number from 3 to 50; wherein the detergent composition is free of phosphate.