Solid Fabric Detergent Patented by P&G

US Patent No. 9,090,858 B2; Procter & Gamble has patented a solid fabric treatment detergent composition. It is comprised of detersive surfactant, phthalimido peroxycaproic acid, zeolite builder, phosphate builder and silicate salt.

Upon dilution in deionized water, the composition has a pH of from about 7.6 to about 8.8; and the composition has a reserve alkalinity to pH 6.0 of at least about 5.0g NaOH/100g detergent composition. The composition comprises carbonate salts selected from alkali metal carbonates and bicarbonates, and wherein the total level of alkali metal bicarbonates is greater, in weight percentage terms, than the total level of alkali metal carbonates.

In addition, the composition further comprises at least one oxidation-resistant hueing agent selected from C.I. direct violet 7, C.I. direct violet 9, C.I. direct violet 11, C.I. direct violet 26, C.I. direct violet 31, C.I. direct violet 35, C.I. direct violet 40, C.I. direct violet 41, C.I. direct violet 51, C.I. direct violet 66, C.I. direct violet 99, C.I. acid violet 50, C.I. acid blue 9, C.I. acid violet 17, C.I. acid black 1, C.I. acid red 17, C.I. acid blue 29, C.I. solvent violet 13, C.I. disperse violet 27, C.I. disperse violet 26 C.I. disperse violet 28, C.I. disperse violet 63, C.I. disperse violet 77, C.I. basic blue 16, C.I. basic blue 65, C.I. basic blue 66, C.I. basic blue 67, C.I. basic blue 71, C.I. basic blue 159, C.I. basic violet 19, C.I. basic violet 35, C.I. basic violet 38, C.I. basic violet 48; C.I. basic blue 3, C.I. basic blue 75, C.I. basic blue 95, C.I. basic blue 122, C.I. basic blue 124, C.I. basic blue 141, C.I reactive blue 19, C.I. reactive blue 163, C.I. reactive blue 182, C.I. reactive blue and C.I. reactive blue 96.