Global Patent Index - EP 1062247 A1

EP 1062247 A1 2000-12-27 - METHOD FOR PRODUCING CELLULOSE FORMIATES

Title (en)

METHOD FOR PRODUCING CELLULOSE FORMIATES

Title (de)

VERFAHREN ZUR HERSTELLUNG VON CELLULOSEFORMIATEN

Title (fr)

PROCEDE POUR PREPARER DES FORMIATES DE CELLULOSE

Publication

EP 1062247 A1 (DE)

Application

EP 99966999 A

Priority

  • DE 19859970 A
  • EP 9910321 W

Abstract (en)

[origin: WO0039167A1] The invention relates to a method for producing a cellulose derivative with formate substituents by reacting a cellulose material that has been impregnated with excess alkaline and/or alkaline-earth lye, with a formylating agent. The method is characterised in that the cellulose material that has been impregnated with the excess base is reacted with a formylating agent until a degree of substitution (DS) of at least approximately 0.5 has been reached. The invention also relates to a method for producing a cellulose derivative with formate substituents by reacting a cellulose material that has been treated with excess alkaline lye with a formylating agent. This method is characterised in that a cellulose material that has been pre-treated with ammonia is reacted with a formylating agent until a degree of substitution (DS) of at least approximately 0.1 has been reached. These methods provide a simple and economical means of producing intermediate products, whose further derivatisation, for example with an acetylation agent, can be better controlled. The resulting products have an essentially homogenous distribution of substituents and in certain cases, have advantageous acetone solubility.

IPC 1-7 (main, further and additional classification)

C08B 3/04; C08B 3/16

IPC 8 full level (invention and additional information)

C08B 3/04 (2006.01); C08B 3/16 (2006.01)

CPC (invention and additional information)

C08B 3/04 (2013.01); C08B 3/16 (2013.01)

Citation (search report)

See references of WO 0039167A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 0039167 A1 20000706; AU 2285500 A 20000731; EP 1062247 A1 20001227

INPADOC legal status


2005-04-06 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20041005

2004-06-30 [RTI1] TITLE (CORRECTION)

- Ref Legal Event Code: RTI1

- Free Format Text: METHOD FOR PRODUCING CELLULOSE FORMIATES

2001-06-20 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20010507

2001-03-21 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: DEUTSCHE INSTITUTE FUER TEXTIL- UND FASERFORSCHUNG

- Ref Legal Event Code: RAP1

2001-01-03 [RIN1] INVENTOR (CORRECTION)

- Ref Legal Event Code: RIN1

- Inventor name: KARSTENS, TIES

2001-01-03 [RIN1] INVENTOR (CORRECTION)

- Ref Legal Event Code: RIN1

- Inventor name: STEIN, ARMIN

2001-01-03 [RIN1] INVENTOR (CORRECTION)

- Ref Legal Event Code: RIN1

- Inventor name: GAEHR, FRANK, DR.

2000-12-27 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000922

2000-12-27 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-12-27 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Ref Legal Event Code: AX

- Free Format Text: AL;LT;LV;MK;RO;SI