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：DE10150405A1

公开(公告)日：2003-04-17

申请号：DE10150405

申请日：2001-10-11

Applicant: BASF AG

Inventor： DATKO ACHIM ,  HAHN KLAUS ,  LEHNEN UWE-JOHANNES ,  ZOELLNER KNUT

IPC: C08J9/00 ,  C08J9/20 ,  C08F12/08

Abstract: In the preparation of expanded polystyrene(EPS) in the presence of graphite particles and at least two peroxides which are broken down to radicals during the first stage of aqueous suspension polymerization, early polymerizate formation occurs and hinders a critical decrease in viscosity when the temperature rises, although the peroxides are not sufficiently stable unless cooled to room temperature. In the preparation of expanded polystyrene(EPS) in the presence of peroxides which are broken down to radicals during the first stage of aqueous suspension polymerization early polymerizate formation occurs and a critical decrease in viscosity when the temperature rises is hindered, although the peroxides are not sufficiently stable unless cooled to room temperature. The styrene mixture with up to 20% by wt. of comonomers in aqueous suspension is polymerized in the presence 0.1-25 wt.% of graphite particles and at least two organic peroxides breaking down at different temperatures.

公开(公告)号：CA2620161A1

公开(公告)日：2007-03-01

申请号：CA2620161

申请日：2006-08-25

Applicant: BASF AG

Inventor： STAMMER ACHIM ,  STOECKELMANN ELMAR ,  LANG NEVEN ,  ZOELLNER KNUT

IPC: C08G2/10 ,  C07D323/06 ,  C08G2/28

Abstract: A method for production of polyoxymethylene homo- or co-polymers by homo- or co-polymerisation of trioxan or additional suitable co-monomers is disclosed , wherein trioxan is firstly produced in a monomer plant, which contains residual monomer and which is degassed in one or more stages to give one or more vapour streams (13, 14), optionally fed to a condenser (K) wherein the condensable components are condensed out to give a condensate (15), recycled into the polymerisation reactor (P) and a gaseous stream (16) containing formaldehyde and a partly degassed polyoxymethylene homo- or co-polymer (17) , supplied to an extruder (E) or mixer and mixed with normal additives and processing agents to give a polymer melt (19) with removal of a formaldehyde - containing extruder or mixer exhaust gas (18) from the extruder (E) or mixer , characterised in that the formaldehyde-containing by product streams (14, 16 , 18) are directly recycled to the monomer plant from the polymer plant withou t addition of adjuncts.

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：DE102004057867A1

公开(公告)日：2006-06-01

申请号：DE102004057867

申请日：2004-11-30

Applicant: BASF AG

Inventor： ASMANN JENS ,  ZOELLNER KNUT ,  HEINEMANN JOHANNES ,  STOECKELMANN ELMAR ,  STAMMER ACHIM

IPC: C08G2/00

Abstract: Preparation of polyoxymethylene (I) comprises polymerizing their monomers in the presence of cationically active initiators and optional regulators, subsequently deactivating and separating (I), where the polymerization is carried out in tubular reactor (A) (with static mixing element) comprising mixing-, polymerizing- and deactivating zones and the diameter of (A) in the mixing zone is less than 90% of the diameter in the polymerizing zone. An independent claim is also included for polyoxymethylene homo-/co-polymer obtained by the above method, where the quotient of d 50/d 100-value (related to M w) is 2.25-5.5.

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.

公开(公告)号：DE102005027802A1

公开(公告)日：2006-12-21

申请号：DE102005027802

申请日：2005-06-15

Applicant: BASF AG

Inventor： ASMANN JENS ,  TRILLER MICHAEL ,  SCHWITTAY CLAUDIUS ,  ZOELLNER KNUT

IPC: C08G2/18 ,  C08G2/28

公开(公告)号：DE102004054629A1

公开(公告)日：2006-05-18

申请号：DE102004054629

申请日：2004-11-11

Applicant: BASF AG

Inventor： ASMANN JENS ,  ZOELLNER KNUT

IPC: C08G2/18

Abstract: Process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b) and also, if appropriate, in the presence of regulators c), followed by deactivation and discharge from the reactor, which comprises using, as deactivator (d) at least one basic compound having at least 2 amino functions of different reactivity in one molecule.

公开(公告)号：AT377611T

公开(公告)日：2007-11-15

申请号：AT05750544

申请日：2005-05-17

Applicant: BASF AG

Inventor： SCHWITTAY CLAUDIUS ,  STOECKELMANN ELMAR ,  HEINEMANN JOHANNES ,  ZOELLNER KNUT ,  STAMMER ACHIM

IPC: C08G2/10 ,  C08G2/08 ,  C08J11/02 ,  C08L59/00

Abstract: A process for removing residual monomers from polyoxymethylene homo- or copolymers, comprising the following process steps: a) the residual monomers are removed in gaseous form as vapors from the polymer in a devolatilization apparatus, b) the residual monomer vapors are removed through a vapor pipe, c) the residual monomers are condensed from the vapors in a condensation apparatus at from 1.09 to 102.4 bar and from 102 to 230° C., the temperature not falling below 102° C. at any point of the condensation apparatus, and those surfaces of the condensation apparatus which come into contact with the vapors being coated with a liquid film of condensed residual monomers.

公开(公告)号：DE102005046593A1

公开(公告)日：2007-04-05

申请号：DE102005046593

申请日：2005-09-28

Applicant: BASF AG

Inventor： ZOELLNER KNUT ,  ASMANN JENS ,  SCHWITTAY CLAUDIUS

IPC: C08G2/18

Abstract: In the production of polyoxymethylene homo- or co-polymers (POM) in a tubular reactor, the reactor has the following zones: (I) initiator mixing zone, in which suitable monomers are mixed with polymerization initiator, (II) polymerization zone, in which mixture is reacted to POM, (III) deactivator mixing zone, in which deactivator (A) is mixed with reaction mixture (B), and (IV) deactivation zone, in which (B) is deactivated by (A), where (a) (I) and/or (III) has dynamic inserts and (b) maximum reactor diameter in (I) is not > 90% of that of (II). Independent claims (1) polyoxymethylene homo- or co-polymers obtained by this process; (2) use of the specified reactor for production of polyoxymethylene homo- or co-polymers.