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    • 49. 发明申请
    • METHOD FOR PRODUCING METHYL-METHACRYLATE POLYMERS IN A RECYCLE REACTOR
    • 用于生产甲基聚合物在一个周期核
    • WO1998012229A1
    • 1998-03-26
    • PCT/EP1997005125
    • 1997-09-18
    • BASF AKTIENGESELLSCHAFTHUNGENBERG, Klaus-DieterBAUMGÄRTEL, MichaelKOCH, JürgenFISCHER, WolfgangTHIELE, Reiner
    • BASF AKTIENGESELLSCHAFT
    • C08F02/02
    • B01J19/245B01J19/2435B01J2219/00094B01J2219/00164C08F2/02C08F20/14
    • The invention concerns methyl-methacrylate polymers with an heterogeneity of 1.0 to 1.2. Said polymers are obtained continuously by polymerization of monomers consisting of no less than 90 % by weight methyl-methacrylate in a recycle reactor, which has preferably at least a tubular reactor or a multitube-flow reactor, avoiding unwarranted wall deposits. Said polymers are produced in such a way that temperature during polymerization stands at 135-150 DEG C, the recycle relation is bigger than 20 when divided by the number of chargings per circulation loop, the mean effective axial circulation is faster than 5 cm/s, a polymerization initiator having a batch half change value of 3 to 10 min. is used, and the inflow concentration of the initiator is set in such a way that by a mean residence time of 1.3 to 2.5 hours a polymer rupture of 0.50 to 0.70 at the output of the reactor is achieved. Preforms having very good optical properties can be produced with the homogeneous polymers.
    • 具有1.0至1.2的多分散性的甲基丙烯酸甲酯的聚合物连续地是通过聚合在本体中的至少90重量甲基丙烯酸甲酯单体中存在的环管反应器,其优选地包括至少一个管或管束反应器中,%,而不会干扰壁沉积所以 产生,即,聚合温度为135-150℃,在循环比小于20通过每个循环环路中,平均有效轴向流动速度大于5厘米/秒的注射次数除以大。 是具有3至10分钟的半间歇时间聚合引发剂。用于与引发剂的进料浓度进行调整,使得,对于在反应器出口,聚合物级分0.50〜0.70的1.3至2.5小时的平均停留时间 实现。 将得到的均匀的聚合物,具有优异的光学特性成形均可生产。