MXPA03003856A - Eteres de celulosa y metodos para preparar los mismos. - Google Patents
Eteres de celulosa y metodos para preparar los mismos.Info
- Publication number
- MXPA03003856A MXPA03003856A MXPA03003856A MXPA03003856A MXPA03003856A MX PA03003856 A MXPA03003856 A MX PA03003856A MX PA03003856 A MXPA03003856 A MX PA03003856A MX PA03003856 A MXPA03003856 A MX PA03003856A MX PA03003856 A MXPA03003856 A MX PA03003856A
- Authority
- MX
- Mexico
- Prior art keywords
- cellulose
- mercerized
- pulp
- cellulose pulp
- floc
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
- C08B11/02—Alkyl or cycloalkyl ethers
- C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
- C08B1/06—Rendering cellulose suitable for etherification
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
- C08B1/08—Alkali cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
- C08B11/02—Alkyl or cycloalkyl ethers
- C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
- C08B11/10—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals
- C08B11/12—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals substituted with carboxylic radicals, e.g. carboxymethylcellulose [CMC]
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Paper (AREA)
Abstract
La presente invencion ha descubierto que la reologia de solucion de eteres de celulosa preparados a partir de pulpa de celulosa, se altera mercerizando y recuperando pulpa de celulosa antes de preparar los eteres de celulosa. Por ejemplo, la viscosidad de solucion de carboximetil celulosa (CMC) producida a partir de pulpa de celulosa mercerizada y recuperada es significativamente mayor a la producida a partir de pulpa de celulosa no mercerizada. La presente invencion proporciona un metodo para preparar eteres de celulosa que comprende los pasos de (a) obtener pulpa de celulosa mercerizada y recuperada, y (b) pulpa de celulosa recuperada en eteres de celulosa. De acuerdo con una modalidad, la pulpa de celulosa es material kraft de madera suave del sur y la pulpa de celulosa mercerizada tiene una viscosidad om-89 TAPPI 230 de cuando mucho 12 cP. Sin embargo, este metodo puede aplicar a todas las pulpas de celulosa, sin importar sus viscosidades, incluyendo aquellas que cuando se mercerizan tienen una viscosidad mayor a 12 cP. La pulpa de celulosa mercerizada normalmente esta substancialmente libre de celulosa III. La pulpa de celulosa mercerizada preparada a traves de este metodo tiene un porcentaje mayor de celulosa cristalina II y un area cristalina menor que la de la pulpa de celulosa no mercerizada. La presente invencion tambien proporciona un metodo para preparar un floculo de celulosa que comprende los pasos de (a) obtener pulpa de celulosa mercerizada y recuperada, y (b) tratar la pulpa mercerizada para formar el floculo de celulosa. Como alternativa, el metodo comprende mercerizar y recuperar un floculo de celulosa. El floculo de celulosa preparado a traves de este metodo tiene una mayor densidad de volumen que el floculo de celulosa preparado a partir de pulpa de celulosa no mercerizada similar. Ademas, la ganancia de densidad por volumen es mayor a la que se espera de la ganancia de grosor (peso por unidad de longitud de fibra) de la preparacion de un floculo de celulosa.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US24503700P | 2000-11-01 | 2000-11-01 | |
PCT/US2001/045482 WO2002036636A1 (en) | 2000-11-01 | 2001-10-31 | Cellulose ethers and method of preparing the same |
Publications (1)
Publication Number | Publication Date |
---|---|
MXPA03003856A true MXPA03003856A (es) | 2004-04-20 |
Family
ID=22925053
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
MXPA03003856A MXPA03003856A (es) | 2000-11-01 | 2001-10-31 | Eteres de celulosa y metodos para preparar los mismos. |
Country Status (11)
Country | Link |
---|---|
US (2) | US7022837B2 (es) |
EP (1) | EP1334132A1 (es) |
JP (1) | JP4195289B2 (es) |
CN (1) | CN1312184C (es) |
AR (1) | AR031183A1 (es) |
AU (1) | AU2002220070A1 (es) |
BR (1) | BR0115388A (es) |
CA (1) | CA2427698A1 (es) |
MX (1) | MXPA03003856A (es) |
NO (1) | NO20031988L (es) |
WO (1) | WO2002036636A1 (es) |
Families Citing this family (54)
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WO2006006948A2 (en) * | 2002-11-14 | 2006-01-19 | Dharmacon, Inc. | METHODS AND COMPOSITIONS FOR SELECTING siRNA OF IMPROVED FUNCTIONALITY |
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US9228186B2 (en) | 2002-11-14 | 2016-01-05 | Thermo Fisher Scientific Inc. | Methods and compositions for selecting siRNA of improved functionality |
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US7951935B2 (en) | 2002-11-14 | 2011-05-31 | Dharmacon, Inc. | siRNA targeting v-myc myelocytomatosis viral oncogene homolog (MYC) |
US9839649B2 (en) | 2002-11-14 | 2017-12-12 | Thermo Fisher Scientific Inc. | Methods and compositions for selecting siRNA of improved functionality |
US7619081B2 (en) * | 2002-11-14 | 2009-11-17 | Dharmacon, Inc. | siRNA targeting coatomer protein complex, subunit beta 2 (COPB2) |
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US7605250B2 (en) * | 2004-05-12 | 2009-10-20 | Dharmacon, Inc. | siRNA targeting cAMP-specific phosphodiesterase 4D |
JP4131271B2 (ja) * | 2005-03-30 | 2008-08-13 | ソニー株式会社 | 情報処理装置および方法、並びにプログラム |
JP5377816B2 (ja) * | 2005-06-16 | 2013-12-25 | 信越化学工業株式会社 | セルロースエーテルの製造方法 |
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JP6379116B2 (ja) | 2013-03-14 | 2018-08-22 | ゲーペー ツェルローゼ ゲーエムベーハー | 酸性漂白シーケンスを使用する、高機能、低粘度クラフト繊維の作製方法およびそのプロセスによって作製される繊維 |
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BR112015020000A2 (pt) | 2013-03-15 | 2017-07-18 | Gp Cellulose Gmbh | fibra kraft quimicamente modificada e métodos de fabricação da mesma |
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CN107915783A (zh) * | 2017-12-06 | 2018-04-17 | 浙江理工大学 | 一种以废纸为原料制备羧甲基纤维素的方法 |
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-
2001
- 2001-10-31 CA CA002427698A patent/CA2427698A1/en not_active Abandoned
- 2001-10-31 AU AU2002220070A patent/AU2002220070A1/en not_active Abandoned
- 2001-10-31 EP EP01992723A patent/EP1334132A1/en not_active Withdrawn
- 2001-10-31 CN CNB018185134A patent/CN1312184C/zh not_active Expired - Fee Related
- 2001-10-31 JP JP2002539394A patent/JP4195289B2/ja not_active Expired - Fee Related
- 2001-10-31 WO PCT/US2001/045482 patent/WO2002036636A1/en active Application Filing
- 2001-10-31 MX MXPA03003856A patent/MXPA03003856A/es active IP Right Grant
- 2001-10-31 BR BR0115388-9A patent/BR0115388A/pt not_active Application Discontinuation
- 2001-10-31 US US10/002,399 patent/US7022837B2/en not_active Expired - Lifetime
- 2001-11-01 AR ARP010105121A patent/AR031183A1/es active IP Right Grant
-
2003
- 2003-05-02 NO NO20031988A patent/NO20031988L/no not_active Application Discontinuation
-
2005
- 2005-07-18 US US11/184,157 patent/US20050250940A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
CN1312184C (zh) | 2007-04-25 |
CN1503807A (zh) | 2004-06-09 |
JP2004536155A (ja) | 2004-12-02 |
AR031183A1 (es) | 2003-09-10 |
NO20031988L (no) | 2003-07-01 |
AU2002220070A1 (en) | 2002-05-15 |
US20050250940A1 (en) | 2005-11-10 |
JP4195289B2 (ja) | 2008-12-10 |
NO20031988D0 (no) | 2003-05-02 |
US7022837B2 (en) | 2006-04-04 |
WO2002036636A1 (en) | 2002-05-10 |
US20020103368A1 (en) | 2002-08-01 |
BR0115388A (pt) | 2005-01-04 |
EP1334132A1 (en) | 2003-08-13 |
CA2427698A1 (en) | 2002-05-10 |
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