| 摘要 |
1,255,869. Detergents containing sequestering agents. MONSANTO CO. 5 Sept., 1969 [6 Sept., 1968], No. 44086/69. Heading C5D. [Also in Division C2] Washing and cleansing agents contain as additives the acids obtained by hydrolysing novel phosphonic esters of the formula wherein R<SP>1</SP> and R<SP>2</SP> are the same or different organic groups, e.g. hydrocarbyl or substituted hydrocarbyl groups or in which two R<SP>1</SP>O groups attached to the same P atom form a heterocyclic ring with the P atom and n is an integer of at least 4, especially 4 to 8. The acids are suitably added in the form of their alkali metal salts and can totally or partially replace complexing agents such as polyphosphates, nitrilotriacetates, ethylenediaminetetraacetate and hydroxyethylidene diphosphate usually occurring in detergent compositions. |
