公开(公告)号：DE4142117A1

公开(公告)日：1993-06-24

申请号：DE4142117

申请日：1991-12-20

Applicant: HOECHST AG

Inventor： FISCHER ANDREAS DR ,  GLASS GERHARD ,  HUEGEL HELGE DIPL ING ,  WILD THOMAS DR

IPC: C08F2/00 ,  C08F2/12 ,  C08F2/22 ,  G01N9/24 ,  G01N9/36 ,  G01N23/02 ,  G01N33/44

Abstract: Process is for determining the degree of conversion in the polymerisation of gaseous monomers in a liq. medium. The process involves determination of the density of foam by a radiometric method. Measurement is performed in an appts. attached to the outside of the reactor, in which a sample of latex is expanded to produce the foam. The method is applicable esp. to the continuous polymerisation of vinyl chloride in aq. emulsion, opt, with other comonomers. USE/ADVANTAGE - For (co)polymerisation of vinyl chloride. Process is simple and rapid (ony one parameter measured), and is used to monitor polymerisation over the whole reaction time, enabling trouble-free control of polymerisation and uniform quality of prod.. Unlike other methods, it is not sensitive to temp. variation and non-homogeneity of the reaction mixt.