PROCESS FOR THE SIMULTANEOUS PREPARATION OF POLYAMIDES WITH AT LEAST TWO DIFFERENT VISCOSITIES,申请号WO2001NL00303-传众专利搜索

PROCESS FOR THE SIMULTANEOUS PREPARATION OF POLYAMIDES WITH AT LEAST TWO DIFFERENT VISCOSITIES

申请公布号：WO0181452(A1)

申请号：WO2001NL00303

申请日期：2001.04.17

申请公布日期：2001.11.01

申请人：

DSM N.V.;BUIJS, WIM

发明人：BUIJS, WIM

分类号：C08G69/16;(IPC1-7):C08G69/16

主分类号：C08G69/16

摘要：A process for the simultaneous preparation of polyamide-6 with at least two different viscosities comprising prepolymerisation of epsilon -caprolactam and/or other polyamide-6 precursors in the presence of water, wherein at least part of the necessary water is supplied to the prepolymerisation via the gas phase and the obtained prepolymer is progressively moved and treated with an inert gas in at least two condensation reaction zones or reactors, placed in series, and the prepolymerisation and condensation are carried out in reactor(s) or reaction zones having a self-renewing interface between molten phase and gas phase with a large surface/volume ratio of the molten phase and the molten phase is relatively strong mixed.