heating bench or by dsc differential scanning colorimetry 2 the molecular weight was determined by gpc relative to polystyrene standards 3 the oh value was determined in accordance with din 53 240 in a 1 liter three necked flask equipped with a stirrer internal thermometer dropping funnel reflux condenser and nitrogen inlet 90 8 g of nonyl oxazoline 0 46 mole were mixed with 42 8 g of p toluene sulfonic acid methyl ester 0 23 mole and the resulting mixture was heated to 60 u00b0 c a highly exothermic reaction began increasing the temperature to 120 u00b0 c after the exothermic reaction had abated the reaction mixture was heated to 160 u00b0 c and another 363 g of nonyl oxazoline 1 84 mole were added dropwise with stirring at such a rate that the temperature did not rise above 170 u00b0 c after 1 hour the addition was terminated the reaction mixture was then stirred for 1 hour at 160 u00b0 c the polymer was poured out onto a teflon film and after cooling was ground to a yellowish powder it had a molecular weight of 2300 weight average and a melting range of 59 u00b0 to 93 u00b0 c dsc as in example 1 103 5 g of undecyl oxazoline were reacted with 42 8 g of p toluene sulfonic acid methyl ester after which another 414 g of undecyl oxazoline were added at 160 u00b0 c the polymer was ground to a yellowish powder it had a molecular weight of 2600 weight average and a melting range of 59 u00b0 to 96 u00b0 c dsc as in example 1 142 4 g of heptadecyl oxazoline were reacted with 42 8 g of p toluene sulfonic acid methyl ester after which another.