| 摘要 |
Arom. monovinyl monomer was polymd. with a rubber to 40-80 % conversion, freed from unreacted monomer to residual monomer content 10 %, and further polymd. at 150≦̸C to give rubber-modified, impact-resistant resin. Thus, a 5:95 polybutadiene-styrene mixt. (3 kg/h) was polymd. in a 1st reactor at 129≦̸C and then in a 2nd reactor at 150≦̸C(conversion 58 %), heated to 190≦̸C, flashed into 400 mg Hg atm. with 0.6 kg/hr removal of unreacted styrene, heated in a 3rd reactor at 180≦̸C, and freed from volatiles(0.1 kg/hr unreacted styrene) to give a graft polymer.
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