Global patent index - EP 1082348 A1

EP 1082348 A1 2001-03-14 - PROCESS FOR PREPARING A HIGH PURITY CHEMICAL-FREE MICROCRYSTALLINE CELLULOSE FROM A CHEMICALLY PRODUCED CELLULOSE

Title (en)

PROCESS FOR PREPARING A HIGH PURITY CHEMICAL-FREE MICROCRYSTALLINE CELLULOSE FROM A CHEMICALLY PRODUCED CELLULOSE

Title (de)

VERFAHREN ZUR HERSTELLUNG EINER HOCHREINEN CHEMIKALIENFREIEN MIKROKRISTALLINEN ZELLULOSE AUS EINER CHEMISCH HERGESTELLTEN ZELLULOSE

Title (fr)

PROCEDE DE PREPARATION D'UNE CELLULOSE MICROCRISTALLINE DE GRANDE PURETE, EXEMPTE DE PRODUITS CHIMIQUES, A PARTIR D'UNE CELLULOSE PRODUITE CHIMIQUEMENT

Publication

EP 1082348 A1 (EN)

Application

EP 98921305 A

Priority

CA 9800479 W

Abstract (en)

[origin: WO9960027A1] A high purity chemical-free microcrystalline cellulose having a low degree od polymerization can be obtained by a process that does not require the use of any acids such as HCl, H2SO4 as are needed in conventional acid hydrolysis processes. This process comprises the steps of preparing a pulp by repulping, filtration and trituration of a chemically produced cellulose. The so-prepared pulp is subjected to heating through a steam explosion treatment in order to obtain a treated pulp. A shearing force is applied onto the pulp at the end of the steam treatment. The treated pulp is then filtered, washed and bleached thereby to obtain the high purity chemical-free microcrystalline cellulose. With this process, one may produce chemical free microcrystalline cellulose by using chemically produced cellulose such as kraft or bisulfite cellulose as starting material. The high purity microcrystalline cellulose obtained from the present process may be used in the pharmaceutical and nutritional industries.

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

C08B 15/08; D21C 9/00

IPC 8 full level (invention and additional information)

D21C 9/00 (2006.01)

CPC (invention and additional information)

D21C 9/001 (2013.01); D21C 9/007 (2013.01)

Citation (search report)

See references of WO 9960027A1

Designated contracting state (EPC)

AT DE ES FI FR GB IT SE

EPO simple patent family

WO 9960027 A1 19991125; AU 7421698 A 19991206; CA 2313261 A1 19991125; CA 2313261 C 20020212; EP 1082348 A1 20010314

INPADOC legal status

2002-04-10 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20011001

2001-07-04 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20010518

2001-03-14 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20001204

2001-03-14 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT DE ES FI FR GB IT SE