Process for preparing a copolymer aqueous solution

专利名称：Process for preparing a copolymer aqueous

solution from which a catalyst residue isremoved

发明人：Hiroyuki Itoh,Teruaki Yamanashi,Hirosuke

Imai

申请号：US06/312821申请日：19811019公开号：US04433098A公开日：19840221

摘要：A process involves preparing an aqueous solution of a diolefin- maleic anhydridecopolymer prepared by solution polymerization, said aqueous solution being free oftetramethylsuccinonitrile (TMSN), a by- product resulting from the decomposition ofazobisisobutyronitrile (AIBN) used as a polymerization initiator for the copolymerizationof the diolefin- maleic anhydride copolymer. The aqueous solution free of TMNS isobtained without the separation of the copolymer from the polymerization liquid inwhich the copolymer was prepared. The process is composed of the two distillationsteps, the first distillation being for the removal of a solvent for polymerization and thesecond distillation being for the removal of water as well as TMSN. The first and seconddistillation steps can be carried out in a continuous or discontinuous manner. The firstdistillation step is carried out after and/or during the addition of water or a basic

aqueous solution, and the second distillation can be effected with or without the additionof such liquid. This process is particularly effective for removal of TMSN which is highlytoxic and causes problems from the safety point of view.

申请人：NIPPON OIL CO., LTD.

代理机构：Ostrolenk, Faber, Gerb & Soffen

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