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1. 发明授权

US07022837B2 Cellulose ethers and method of preparing the same 有权
公开(公告)号：US07022837B2
公开(公告)日：2006-04-04
申请号：US10002399
申请日：2001-10-31
申请人： Roger Bruce Harding , Susan L. H. Crenshaw , Paul Eugene Gregory , Denise Hartnett Broughton
发明人： Roger Bruce Harding , Susan L. H. Crenshaw , Paul Eugene Gregory , Denise Hartnett Broughton
IPC分类号： C08B11/08
CPC分类号： C08B11/04 , C08B1/06 , C08B1/08 , C08B11/00 , C08B11/12
摘要： The present inventors have discovered that the solution rheology of cellulose ethers prepared from cellulose pulp is altered by mercerizing and recovering cellulose pulp before preparing the cellulose ethers. For example, the solution viscosity of carboxymethyl cellulose (CMC) produced from mercerized and recovered cellulose pulp is significantly greater than that produced from non-mercerized cellulose pulp. The present invention provides a method of preparing cellulose ethers comprising the steps of (a) obtaining mercerized and recovered cellulose pulp, and (b) converting the mercerized and recovered cellulose pulp into the cellulose ethers. According to one embodiment, the cellulose pulp is southern softwood kraft and the mercerized cellulose pulp has a TAPPI 230 om-89 viscosity of at most 12 cP. This method, however, may be applied to all cellulose pulps, regardless of their viscosities, including those which, when mercerized, have a viscosity greater than 12 cP. The mercerized cellulose pulp is typically substantially free of cellulose III. Mercerized cellulose pulp prepared by this method has a greater percentage of crystalline cellulose II and a smaller crystalline area than that of non-mercerized cellulose pulp. The present invention also provides a method of preparing a cellulose floc comprising the steps of (a) obtaining mercerized and recovered cellulose pulp, and (b) treating the mercerized pulp to form the cellulose floc. Alternatively, the method comprises mercerizing and recovering a cellulose floc. Cellulose floc prepared by this method have a greater bulk density than cellulose floc prepared from similar non-mercerized cellulose pulp. Furthermore, the bulk density gain is greater than that expected from the coarseness (weight per unit of fiber length) gain from preparing a cellulose floc.

2. 发明授权

US06686464B1 Cellulose ethers and method of preparing the same 有权
标题翻译：纤维素醚及其制备方法
公开(公告)号：US06686464B1
公开(公告)日：2004-02-03
申请号：US09704258
申请日：2000-11-01
申请人： Roger Bruce Harding , Susan L. H. Crenshaw , Paul Eugene Gregory , Denise Hartnett Broughton
发明人： Roger Bruce Harding , Susan L. H. Crenshaw , Paul Eugene Gregory , Denise Hartnett Broughton
IPC分类号： C08B1100
CPC分类号： C08B11/12 , C08B11/00 , C08B11/02 , D21C9/002
摘要： The present inventors have discovered that the solution rheology of cellulose ethers prepared from cellulose pulp is altered by mercerizing and recovering cellulose pulp before preparing the cellulose ethers. For example, the solution viscosity of carboxymethyl cellulose (CMC) produced from mercerized and recovered cellulose pulp is significantly greater than that produced from non-mercerized cellulose pulp. The present invention provides a method of preparing cellulose ethers comprising the steps of (a) obtaining mercerized and recovered cellulose pulp, and (b) converting the mercerized and recovered cellulose pulp into the cellulose ethers. The mercerized cellulose pulp is typically substantially free of cellulose III. Mercerized cellulose pulp prepared by this method has a greater percentage of crystalline cellulose II and a smaller crystalline area than that of non-mercerized cellulose pulp. The present invention also provides a method of preparing a cellulose floc comprising the steps of (a) obtaining mercerized and recovered cellulose pulp, and (b) treating the mercerized pulp to form the cellulose floc. Alternatively, the method comprises mercerizing and recovering a cellulose floc. Cellulose floc prepared by this method have a greater bulk density than cellulose floc prepared from similar non-mercerized cellulose pulp. Furthermore, the bulk density gain is greater than that expected from the coarseness (weight per unit of fiber length) gain from preparing a cellulose floc.
摘要翻译：本发明人已经发现，在制备纤维素醚之前，通过丝光化和回收纤维素纸浆来改变由纤维素纸浆制备的纤维素醚的溶液流变性。例如，由丝光和回收的纤维素纸浆生产的羧甲基纤维素（CMC）的溶液粘度显着大于非丝光纤维素纸浆产生的溶液粘度。本发明提供一种制备纤维素醚的方法，包括以下步骤：（a）获得丝光和回收的纤维素纸浆，和（b）将丝光和回收的纤维素纸浆转化为纤维素醚。丝光纤维素纸浆通常基本上不含纤维素III。通过该方法制备的丝光纤维素纸浆具有比非丝光纤维素纸浆更大百分比的结晶纤维素II和更小的结晶面积。本发明还提供一种制备纤维素絮凝物的方法，包括以下步骤：（a）获得丝光和回收的纤维素纸浆，和（b）处理丝光纸浆以形成纤维素絮凝物。或者，该方法包括丝光和回收纤维素絮凝物。通过该方法制备的纤维素絮体比由类似的非丝光纤维素纸浆制备的纤维素絮体具有更大的堆积密度。此外，堆积密度增益大于从制备纤维素絮凝体的粗度（每单位纤维长度的重量）增益所预期的体积增益。

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