. . . "Other routes to high purity alkyl ethoxy carboxylates are the reaction of alcohol ethoxylate with oxygen in the presence of platinum, palladium, or other noble metals, as disclosed in U.S. Pat. No. 4,223,460 (Example 1-7); U.S. Pat. No. 4,214,101 (Example 1); U.S. Pat. No. 4,348,509; German Patent No. 3,446,561; and Japanese Patent Application No. 62,198,641." .