Global Patent Index - EP 1622967 A1

EP 1622967 A1 20060208 - METHOD FOR THE PRODUCTION OF POWDER-TYPE ETHYLENE VINYL ALCOHOL MIXED POLYMERS

Title (en)

METHOD FOR THE PRODUCTION OF POWDER-TYPE ETHYLENE VINYL ALCOHOL MIXED POLYMERS

Title (de)

VERFAHREN ZUR HERSTELLUNG VON PULVERFÖRMIGEN ETHYLEN-VINYLAL KOHOL-MISCHPOLYMERISATEN

Title (fr)

PROCEDE POUR PRODUIRE DES COPOLYMERES PULVERULENTS D'ETHYLENE ET D'ALCOOL VINYLIQUE

Publication

EP 1622967 A1 20060208 (DE)

Application

EP 04730227 A 20040429

Priority

  • EP 2004004564 W 20040429
  • DE 10321942 A 20030515

Abstract (en)

[origin: WO2004101655A1] The invention relates to a method for the production of powder-type ethylene vinyl alcohol mixed polymers by radical polymerisation of ethylene and one or several vinyl esters, and optionally other monomers which can be copolymerised therewith, subsequently saponification of the thus obtained ethylene vinyl ester polymer mixture in order to form ethylene vinyl alcohol mixed polymers. The invention is characterised in that the ethylene vinyl alcohol mixed polymer is precipitated, after saponification, from the alcoholic solution by cooling according to a temperature gradient, and optionally, by the addition of water. In ethylene vinyl alcohol mixed polymers which are derived from low molecular ethylene vinyl ester mixed polymers, the average molecular weight Mw varies between 2000 - 100000 g/mol and the temperature gradient is between -0.1 DEG C/min to -10 DEG C/min. In ethylene vinyl alcohol mixed polymers which are derived from high molecular ethylene vinyl ester mixed polymers, the average molecular weight Mw is > 100000 g/mol and the temperature gradient is between -0.1 DEG C/min to -1 DEG C/min.

IPC 1-7

C08J 3/12; C08J 3/14; C08F 8/12

IPC 8 full level

C08F 8/12 (2006.01); C08J 3/14 (2006.01)

CPC (source: EP US)

C08F 8/12 (2013.01 - EP US); C08J 3/14 (2013.01 - EP US); C08F 2800/10 (2013.01 - EP US); C08F 2810/50 (2013.01 - EP US); C08J 2329/04 (2013.01 - EP US)

C-Set (source: EP US)

  1. C08F 8/12 + C08F 210/02
  2. C08F 210/02 + C08F 218/08
  3. C08F 8/12 + C08F 218/08
  4. C08F 218/08 + C08F 210/02

Citation (search report)

See references of WO 2004101655A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

DOCDB simple family (publication)

WO 2004101655 A1 20041125; CN 1832983 A 20060913; DE 10321942 A1 20041209; EP 1622967 A1 20060208; JP 2006526050 A 20061116; US 2006258803 A1 20061116

DOCDB simple family (application)

EP 2004004564 W 20040429; CN 200480013254 A 20040429; DE 10321942 A 20030515; EP 04730227 A 20040429; JP 2006508157 A 20040429; US 55600005 A 20051108