solvent for an isoprene line flush a peak temperature of 84 u00b0 c occurred and 20 minutes after the isoprene addition the temperature dropped to 73 u00b0 c at which time 6 44 kg of styrene were added a line flush of 34 kg of hydrocarbon solvent immediately followed the styrene addition after 20 minutes reaction time 40 7 ml of ethylene oxide were added and allowed to react for approximately 1 hour next 86 8 ml of methacryloyl chloride which was pre mixed with 200 300 ml of cyclohexane solvent were added and allowed to quench the reaction for a period of approximately 1 hour finally 15 g of isopropanol were added to react with any residual methacryloyl chloride analysis by size exclusion chromatography showed a single main peak with a number average molecular weight of 190 283 on a polystyrene calibration basis and a peak maxima at 194 051 on a polystyrene calibration basis this polymer is representative of a block copolymer with a reactive endgroup in which the reactive living anionic end prior to capping with ethylene oxide and methacryloyl chloride is made from styrene monomer this component was identified as a styrene isoprene styrene triblock with a reactive endgroup u201c r sis u201d the entire contents of the reactor were transferred to the mix tank containing component a for solution blending appropriate amounts of phenolic antioxidant were added for the contents of this component to produce a level of 1200 ppm base polymer and phosphite antioxidant was added at a level.