mineral oil of 5 u00d7 10 u2212 6 m 2 s s 1 is a 67 27 6 by weight mixture of polyoxyethylene n 5 lauryl ether sorbintan monooleate and sodium dodecysulfonate s 2 is a 14 85 2 by weight mixture of polyoxyalkylene n 5 lauryl ether decanoic ester of polyoxyethylene n 4 lauryl ether and dipotassium dodecenylsuccinic acid s 3 is a 70 10 20 by weight mixture of polyoxyethylene n 4 lauryl aminoether lauryl dimethyl ammonioacetate and lauryl phosphate octyltrimethyl ammonium s 4 is a 27 67 6 by weight mixture of polyoxyethylene n 5 lauryl ether polyoxyalkylene n 20 hardened castor oil and polyoxyethylene n 3 lauryl ether phosphoric ester potassium s 5 is a 40 40 20 by weight mixture of polyoxyethylene n 5 lauryl ether polyoxyalkylene n 4 diethylenetriamineisostearylamide and lauryl dimethylamine oxide oiling and evaluation of each agent with respect to biodegradable synthetic yarns lactic acid polymer chips having an average molecular weight 100 000 a melt flow rate of 25 g 10 min at 210 u00b0 a glass transition temperature of 64 u00b0 and a specific gravity of 1 26 were fed into an extruder type melt spinning machine where they were melted at 210 u00b0 after the hot melt was extruded from a spinneret and hardened by.