Patent ID: 8207102
Filing Date: 2012-06-26
Classification: C02F,C11D,C23F,C23G

Abstract:
1. A hard surface cleaner comprising surfactant and about 0.01 to about 20 wt-% corrosion inhibitor; the corrosion inhibitor comprising: the reaction complex of a salt of a threshold agent and a water-soluble calcium and magnesium salt such that the salt cations of the threshold agent are fully exchanged, wherein the threshold agent is selected from the group consisting of polyacrylates, copolymers of polyacrylates, polymethacrylates, copolymes of polymethacrylates, polyacrylamides; copolymers of polyacrylamides, organophosphonates, polyglyoxylic acids, polyamidocarboxylic acids, modified polyamidocarboxylic acids, polyaspartic acid, and mixtures thereof; less than about 0.5 wt-% aluminum-containing compounds; wherein the weight ratio of water soluble magnesium salt to water soluble calcium salt is greater than or equal to about 1:1 and the weight ratio of water soluble calcium salt to threshold agent is about 1:2 and further wherein the hard surface cleaner is a solid and the composition is builder free.