US2002139498A1PendingUtilityA1

Method of producing microcrystalline

37
Priority: Jan 5, 2001Filed: Jan 3, 2002Published: Oct 3, 2002
Est. expiryJan 5, 2021(expired)· nominal 20-yr term from priority
Inventors:Jim MathesonJian GuoSheila Kathleen MurphyLinnea J. Shaver
C08B 15/02D21C 9/004
37
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

The present invention relates to a new method for producing microcrystalline cellulose using never-dried pulp as the cellulose source.

Claims

exact text as granted — not AI-modified
We claim:  
     
         1 . A method of producing microcrystalline cellulose comprising selecting as a starting material, a never-dried cellulosic material.  
     
     
         2 . The method of  claim 1  wherein the cellulosic material is prehydrolyzed kraft hardwood.  
     
     
         3 . The method of  claim 1  wherein the cellulosic material is prehydrolyzed kraft softwood.  
     
     
         4 . The method of  claim 1  wherein the cellulosic material is hardwood sulfite.  
     
     
         5 . The method of  claim 1  wherein the cellulosic material is softwood sulfite.  
     
     
         6 . The method of  claim 1  wherein the cellulosic material is paper-grade softwood.  
     
     
         7 . The method of  claim 1  wherein the cellulosic material is paper-grade hardwood.  
     
     
         8 . The method of  claim 2  wherein the prehydrolyzed kraft hardwood is ESTERCELL™.  
     
     
         9 . The method of  claim 2  wherein the prehydrolyzed kraft hardwood is TYRCELL™.  
     
     
         10 . The method of  claim 2  wherein the prehydrolyzed kraft hardwood is VISCOCELL™.  
     
     
         11 . A method of producing microcrystalline cellulose comprising: 
 (a) selecting as a starting material, a never-dried cellulosic material;    (b) subjecting the cellulosic material to acid hydrolysis;    (c) neutralizing the acid,    (d) washing; and    (e) drying to form microcrystalline cellulose.    
     
     
         12 . The method of  claim 11  wherein the cellulosic material is prehydrolyzed kraft hardwood.  
     
     
         13 . The method of  claim 11  wherein the cellulosic material is prehydrolyzed kraft softwood .  
     
     
         14 . The method of  claim 11  wherein the cellulosic material is hardwood sulfite.  
     
     
         15 . The method of  claim 11  wherein the cellulosic material is softwood sulfite.  
     
     
         16 . The method of  claim 11  wherein the cellulosic material is paper-grade softwood.  
     
     
         17 . The method of  claim 11  wherein the cellulosic material is paper-grade hardwood.  
     
     
         18 . The method of  claim 12  wherein the prehydrolyzed kraft hardwood is ESTERCELL™.  
     
     
         19 . The method of  claim 12  wherein the prehydrolyzed kraft hardwood is TYRCELL™.  
     
     
         20 . The method of  claim 12  wherein the prehydrolyzed kraft hardwood is VISCOCELL™.  
     
     
         21 . The method of  claim 11  wherein the acid hydrolysis step is carried out with dilute sulphuric acid.  
     
     
         22 . The method of  claim 11  wherein the acid hydrolysis step is carried out with dilute hydrochloric acid.

Join the waitlist — get patent alerts

Track US2002139498A1 — get alerts on status changes and closely related new filings.

We store only your email — no account needed. See our privacy policy.