公开(公告)号：DE102005008598A1

公开(公告)日：2006-08-24

申请号：DE102005008598

申请日：2005-02-23

Applicant: BASF AG

Inventor： URTEL MELANIE ,  ASMANN JENS ,  ZOELLNER KNUT ,  BLINZLER MARKO

IPC: C08G2/18

Abstract: Continuous preparation (Q) of polyoxymethylene homo- or co-polymer with lean formaldehyde content, comprises reacting formaldehyde initiator (at least 50 wt.%) and antioxidant (80 wt.%). An independent claim is included for formaldehyde-lean polyoxymethylene homo or - copolymer, obtained by the above process.

公开(公告)号：DE102005022641A1

公开(公告)日：2006-11-16

申请号：DE102005022641

申请日：2005-05-11

Applicant: BASF AG

Inventor： SCHWITTAY CLAUDIUS ,  BLINZLER MARKO ,  MATTMANN WOLFGANG ,  ASMANN JENS

IPC: C08G2/28 ,  C08L59/04

公开(公告)号：DE102005012480A1

公开(公告)日：2006-09-21

申请号：DE102005012480

申请日：2005-03-16

Applicant: BASF AG

Inventor： ASMANN JENS ,  ZOELLNER KNUT ,  BLINZLER MARKO ,  URTEL MELANIE ,  SCHWITTAY CLAUDIUS

IPC: C08G2/28 ,  C08G2/18

Abstract: Process for removing unconverted residual monomers from polyoxymethylenes, wherein a devolatilization step is carried out in an extrudate devolatilizer.

公开(公告)号：DE102005004855A1

公开(公告)日：2006-08-03

申请号：DE102005004855

申请日：2005-02-01

Applicant: BASF AG

Inventor： RYLANDER JESSICA ,  ZOELLNER KNUT ,  BLINZLER MARKO ,  URTEL MELANIE ,  ASMANN JENS

IPC: C08G2/28 ,  B01J21/16 ,  B01J23/85 ,  C07C47/045 ,  C08G2/08 ,  C08G65/46

Abstract: Removing non-reacted formaldehyde oligomer containing monomer residue and polyoxymethylene homo- or -copolymer comprises: drawing-off the monomer residue from gaseous polymer, in a degassing device; and contacting the residue with a catalyst exhibiting acid group and at which the formaldehyde oligomer is transferred to monomer formaldehyde (where the pressure in the contacting step is less than or equal to the pressure in the drawing step). Independent claims are included for: (1) the preparation of polyoxymethylene homo- or -copolymers comprising producing or retaining the monomer in a monomer plant; polymerizing the monomer in the polymerization reactor to give polymers; and removing the monomer residue in the polymer, during or after polymerization, by the above method; and (2) a polyoxymethylene homo- or -copolymers obtained by the process.

公开(公告)号：DE102005054877A1

公开(公告)日：2007-05-24

申请号：DE102005054877

申请日：2005-11-17

Applicant: BASF AG

Inventor： SCHWITTAY CLAUDIUS ,  BLINZLER MARKO ,  MECKELNBURG DIRK

IPC: C08G2/28

公开(公告)号：DE102005012482A1

公开(公告)日：2006-09-21

申请号：DE102005012482

申请日：2005-03-16

Applicant: BASF AG

Inventor： ASMANN JENS ,  ZOELLNER KNUT ,  BLINZLER MARKO ,  URTEL MELANIE ,  SCHWITTAY CLAUDIUS

IPC: C08G2/18

Abstract: A process for the preparation of polyoxymethylenes by cationic polymerization of the monomers a) in the presence of initiators b) and, if appropriate, in the presence of regulators c) and subsequent deactivation and isolation of the polymer, wherein the total amount of proton donors is less than 5000 ppm in the entire polymerization.

公开(公告)号：DE102005034490A1

公开(公告)日：2007-01-25

申请号：DE102005034490

申请日：2005-07-20

Applicant: BASF AG

Inventor： BLINZLER MARKO ,  ZOELLNER KNUT ,  SCHWITTAY CLAUDIUS ,  ASMANN JENS

IPC: C08G2/18 ,  C08G2/24

Abstract: Process for preparing polyoxymethylene copolymers (POMs) by a) polymerizing a reaction mixture comprising suitable main monomers and comonomers and also a polymerization initiator and, if appropriate, a regulator, b) adding a deactivator and c) removing the residual monomers, wherein the amount of compounds whose melting point at 1013 hPa is below 60° C. present in the reaction mixture at any point in time during the process is not more than 0.1% by weight, with the POM, the monomers, comonomers, polymerization initiators, deactivators and regulators not being included in the calculation.