发明名称 |
Process for a two stage melt polymerization for the production of polybenzimidazole having an improved solid state polymerization |
摘要 |
A process for the production of high molecular weight polybenzimidazole by one: providing a first reaction vessel; charging the reaction vessel with at least one aromatic hydrocarbon tetraamine, and a heterocylic ring making up the dicarboxylic component; heating the reactants under agitation in a substantially oxygen-free atmosphere with agitation until the agitator torque is about 1.5 times the torque before a rise in viscosity begins; terminating the agitation while continuing to heat the reaction mixture to about 230° C. while allowing the reaction mass to foam; cooling the reaction mass to a friable foamed mass; crushing the friable foamed mass to obtain a ground prepolymer; and two: providing a second reaction vessel, the second reaction vessel being a high intensity reaction vessel; transferring the ground prepolymer to the second reaction vessel; heating the ground prepolymer under agitation to over 315° C. at atmospheric pressure for a time of about 90 minutes.
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申请公布号 |
US2006004182(A1) |
申请公布日期 |
2006.01.05 |
申请号 |
US20040884103 |
申请日期 |
2004.07.02 |
申请人 |
CELANESE ADVANCED MATERIALS, INC. |
发明人 |
DAWKINS BOBBY G.;BAKER J. D.;JOINER RITA H. |
分类号 |
C08G69/00 |
主分类号 |
C08G69/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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