| 摘要 |
Laundry detergents useful for cold-water cleaning and a cold-water cleaning method are disclosed. The detergents comprise: (a) an a-sulfonated fatty ester surfactant comprising a compound having the formula: R1-CH(SO3M)-CO-OR2 wherein M is hydrogen, an alkali metal, an alkaline earth metal, ammonium, and amine salt, or a mixture thereof; R1 is an unsubstituted or hydroxy-substituted, saturated or unsaturated, linear or branched C6-C16 alkyl group; and R2 is a saturated or unsaturated linear or branched C8 to C12 alkyl group; and (b) an anionic surfactant, a nonionic surfactant, or a combination thereof. Surprisingly, α-sulfonated fatty ester surfactants derived from a C8 to C12 alcohol provide outstanding performance in removing greasy stains such as bacon grease, cooked beef fat, or beef tallow from soiled articles even at wash temperatures at or below 30°C. Detergents formulated with the surfactants outperform control cold-water detergents by a wide margin, including detergents comprising α-sulfonated fatty esters made from lower alcohols, such as methyl, butyl, or hexyl esters of α-sulfonated fatty acids. |
