Surfactant free detergent with anti-soil agent.(Patent Review)

* U.S. Patent No. 7,553,807 B2; Miz Co., Ltd., Kanagawa, Japan, has been awarded a U.S. patent for a method for washing clothes in a washing liquid composition that does not include a surface active agent, but includes, as a substantial active component for detergency, a washing component. It is comprised of an alkaline inorganic salt selected from the group consisting of carbonate alkali metal salt; silicate alkali metal salt; carbonate alkali metal salt and bicarbonate alkali metal salt; bicarbonate alkali metal salt and silicate alkali metal salt; or carbonate alkali metal salt and silicate alkali metal salt. The formulation also contains an anti-soil redeposition component that prevents resoiling of hydrophilic fibers and hydrophobic fibers when coexisting with said inorganic salt, which is a water-soluble polymer substance of a nonionic system including at least one species selected from the group consisting of an acetyl group, methoxy group, hydroxypropyl group, and poly-oxy propylene group as the hydrophobic group, and including a hydroxyl group as the hydrophilic group. The detergent composition has a pH between 9.5-11, is dissolved in a concentration of 0.5 to 5 g/L to form the washing liquid, and through the existence of the anti-soil redeposition component, has surface tension of 58 dyne/cm or less.

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