EP 1585772 A1 20051019 - METHOD FOR THE PRODUCTION OF A POROUS CELLULOSE BODY
Title (en)
METHOD FOR THE PRODUCTION OF A POROUS CELLULOSE BODY
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES PORÖSEN CELLULOSISCHEN KÖRPERS
Title (fr)
PROCEDE DE PRODUCTION D'UN CORPS CELLULOSIQUE POREUX
Publication
Application
Priority
- AT 2004000013 W 20040119
- AT 712003 A 20030120
Abstract (en)
[origin: WO2004065424A1] The invention relates to a method for the production of a porous cellulose body, consisting of the following steps: a cellulose solution is produced in a tertiary amino oxide, particularly N-methylmorpholine-N-oxide; the cellulose used has an average polymerization degree of 150 - 2000 and the solution has a 0.1 - 5 wt. % concentration of cellulose; a body is produced from said cellulose solution; the body is precipitated in a precipating agent, thereby enabling a precipitated cellulose body to be obtained; the precipitating agent is an aqueous medium or a cellulose-precipitating non-aqueous medium which cannot be mixed with water, said non-aqueous medium being able to dissolve the tertiary amino oxide and being able to be mixed with a supercritical solvent. The inventive method is characterised in that if the aqueous medium is used as a precipitating agent, the tertiary amino oxide contained in the precipitated cellulose body is washed out with the aqueous medium; the aqueous medium is replaced by a liquid medium which can be mixed with a supercritical solvent; the cellulose body which is wetted with the replacement medium is treated with the supercritical solvent, enabling a porous cellulose body to be obtained; or if a non-aqueous medium is used as a precipitating medium, the tertiary amino oxide contained in the cellulose body is washed out with the non-aqueous medium; the cellulose body which is wetted with the non-aqueous medium is treated with the supercritical solvent in order to obtain a porous cellulose body.
IPC 1-7
IPC 8 full level
C08J 9/28 (2006.01)
CPC (source: EP)
C08J 9/28 (2013.01); C08J 2201/054 (2013.01); C08J 2203/08 (2013.01); C08J 2301/00 (2013.01); Y02P 20/54 (2015.11)
Citation (search report)
See references of WO 2004065424A1
Citation (examination)
GB 1575700 A 19800924 - PURDUE RESEARCH FOUNDATION
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 PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004065424 A1 20040805; AT 412404 B 20050225; AT A712003 A 20040715; EP 1585772 A1 20051019; TW 200418558 A 20041001
DOCDB simple family (application)
AT 2004000013 W 20040119; AT 712003 A 20030120; EP 04703120 A 20040119; TW 93101667 A 20040120