公开(公告)号：CA1307871C

公开(公告)日：1992-09-22

申请号：CA558207

申请日：1988-02-05

Applicant: HOECHST AG

Inventor： SEXTRO GUENTER ,  MUECK KARL-FRIEDRICH ,  BURG KARLHEINZ ,  FISCHER EBERHARD

IPC: C08G2/10 ,  C08G2/28

Abstract: HOE 87/F 037 Continuous process for removing unstable components from crude oxymethylene copolymer, which still contains catalysts, monomeric starting materials and unstable components, by treating the copolymer with deactivators, optionally in the presence of auxiliaries, in a pressure zone, and subsequently removing volatile components in a pressure-release zone in the presence or absence of stabilizers, in which process the crude polymer is fully melted in the absence of the deactivators and auxiliaries immediately after completion of the polymerization step, and the deactivators are subsequently incorporated, alone or together with auxiliaries, under pressure into the resultant polymer melt in at least one pressure zone. By this process, degradation is avoided and significantly better properties are contained.

公开(公告)号：AU530075B2

公开(公告)日：1983-06-30

申请号：AU4805279

申请日：1979-06-14

Applicant: HOECHST AG

Inventor： MAYER GUNTER ,  FISCHER EBERHARD ,  STRAMETZ HELMUT

IPC: C08F6/00 ,  C08F6/06 ,  C08F6/28 ,  C08F10/06 ,  C08F6/24 ,  C08J11/00 ,  C08J11/02

Abstract: During the recovery of the unreacted propylene from the mother liquor obtained in the polymerization of liquid propylene, the major part of the propylene is evaporated in a first evaporation step at a low temperature and the remaining part is evaporated in a second evaporator at a high temperature. In this way an early agglomerization of the atactic and/or low-molecular weight polymer dissolved in the mother liquor and fouling of the heat exchanger tubes and/or of the column trays is avoided.

公开(公告)号：AU4805279A

公开(公告)日：1979-12-20

申请号：AU4805279

申请日：1979-06-14

Applicant: HOECHST AG

Inventor： MAYER GUNTER ,  FISCHER EBERHARD ,  STRAMETZ HELMUT

IPC: C08F6/00 ,  C08F6/06 ,  C08F6/28 ,  C08F10/06 ,  C08F6/24 ,  C08J11/02 ,  C08J11/00

Abstract: During the recovery of the unreacted propylene from the mother liquor obtained in the polymerization of liquid propylene, the major part of the propylene is evaporated in a first evaporation step at a low temperature and the remaining part is evaporated in a second evaporator at a high temperature. In this way an early agglomerization of the atactic and/or low-molecular weight polymer dissolved in the mother liquor and fouling of the heat exchanger tubes and/or of the column trays is avoided.

公开(公告)号：CA1109494A

公开(公告)日：1981-09-22

申请号：CA329816

申请日：1979-06-14

Applicant: HOECHST AG

Inventor： MAYER GUNTER ,  FISCHER EBERHARD ,  STRAMETZ HELMUT

IPC: C08F6/00 ,  C08F6/06 ,  C08F6/28 ,  C08F10/06 ,  C07C11/06

Abstract: PROCESS FOR RECOVERING UNREACTED PROPYLENE IN THE MASS POLYMERIZATION of the disclosure During the recovery of the unreacted propylene from the mother liquor obtained in the polymerization of liquid propylene, the major part of the propylene is evaporated in a first evaporation step at a low temperature and the remaining part is evaporated in a second evaporator at a high temperature. In this way an early agglomerization of the atactic and/or lowmolecular weight polymer dissolved in the mother liquor and fouling of the heat exchanger tubes and/or of the column trays is avoided.

公开(公告)号：AU4847479A

公开(公告)日：1980-01-03

申请号：AU4847479

申请日：1979-06-28

Applicant: HOECHST AG

Inventor： FISCHER EBERHARD ,  MAYER GUNTER ,  STROER FRIEDEL ,  STRAMETZ HELMUT

IPC: C07C7/10 ,  C07C1/00 ,  C07C11/06 ,  C07C67/00 ,  C08F2/02 ,  C08F6/28 ,  C08F110/06 ,  C08F6/24