monomer conversion of 98 9 it has composition 25 allyl alcohol monopropoxylate units and 75 butyl acrylate units number average molecular weight mn 2830 molecular weight distribution mw mn 2 47 hydroxyl number 121 mg koh g brookfield viscosity at 25 u00b0 c 23600 cps and t g u2212 48 u00b0 c the reactor as described in example 1 is charged with allyl alcohol 690 g t butyl methacrylate 1070 g and styrene 340 g are mixed and the mixture is purged with nitrogen and charged into the monomer pump di t butyl peroxide dtbp 183 g is purged with nitrogen and charged to the initiator pump the reactor is purged three times with nitrogen sealed and the contents are heated to 145 u00b0 c monomer mixture and initiator are added to the reactor gradually at a decreasing rate over 6 hours while maintaining the reaction temperature at 145 u00b0 c the addition rate of monomer mixture is hour 1 300 g hour 2 285 g hour 3 250 g hour 4 225 g hour 5 200 g and hour 6 150 g the addition rate of the initiator is hour 1 39 g hour 2 36 5 g hour 3 32 g hour 4 29 5 g hour 5 26 g and hour 6 20 g the reaction mixture is kept at 145 u00b0 c for another 0 5 hour following monomer and initiator addition unreacted monomers are removed by vacuum distillation maximum temperature 150 u00b0 c the resin is discharged from the reactor at 110 u00b0 c the resinous.