EP 1969023 A1 20080917 - METHOD FOR PRODUCING OXYMETHYLENE-POLYMERS IN THE HOMOGENEOUS PHASE AND USE THEREOF
Title (en)
METHOD FOR PRODUCING OXYMETHYLENE-POLYMERS IN THE HOMOGENEOUS PHASE AND USE THEREOF
Title (de)
VERFAHREN ZUR HERSTELLUNG VON OXYMETHYLEN-POLYMEREN IN HOMOGENER PHASE UND VERWENDUNG
Title (fr)
PROCEDE DE PRODUCTION DE POLYMERES D'OXYMETHYLENE EN PHASE HOMOGENE ET UTILISATION DESDITS POLYMERES
Publication
Application
Priority
- EP 2006012027 W 20061214
- DE 102005062327 A 20051224
Abstract (en)
[origin: DE102005062327A1] A method for the production of oxymethylene homopolymers involves (i) homogeneous polymerisation of an oxymethylene unit-forming monomer in presence of a formaldehyde acetal and a cationic polymerisation initiator, and (ii) stopping polymerisation before thermodynamic equilibrium and at less than 90% of maximum conversion, by (iii) deactivating the active polymer chain with an organic or inorganic base. A method for the production of oxymethylene homopolymers of formula R 1>-(OCH 2) n-O-R 2>(I) containing up to 0.5 wt% oxyethylene groups and/or up to 1 wt% branching units, in which R 1>, R 2>alkyl; n : 500 or more . This method involves (i) polymerisation of a -CH 2O- unit-forming monomer (M) in a homogeneous phase in presence of a formaldehyde acetal (II) and an initiator (IV) for cationic polymerisation, and (ii) stopping polymerisation before reaching thermodynamic equilibrium and at less than 90% of maximum conversion, by (iii) deactivation of the active polymer chain in the homogeneous phase by treatment with a dissolved or dispersed organic or inorganic base.
IPC 8 full level
C08G 2/10 (2006.01)
CPC (source: EP)
Citation (search report)
See references of WO 2007073873A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
DE 102005062327 A1 20070628; CN 101346403 A 20090114; CN 101346403 B 20120620; EP 1969023 A1 20080917; EP 2431397 A1 20120321; WO 2007073873 A1 20070705
DOCDB simple family (application)
DE 102005062327 A 20051224; CN 200680049123 A 20061214; EP 06829590 A 20061214; EP 11190596 A 20061214; EP 2006012027 W 20061214