US2005016699A1PendingUtilityA1

Glyoxal crosslinked cellulosic fibers having high bulk

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Assignee: WEYERHAEUSER COPriority: Jul 25, 2003Filed: Jul 25, 2003Published: Jan 27, 2005
Est. expiryJul 25, 2023(expired)· nominal 20-yr term from priority
Inventors:Angel StoyanovShahrokh A. Naieni
D06M 13/123D06M 2101/06D21C 9/007
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Claims

Abstract

Glyoxal crosslinked cellulosic fibers having high wet bulk, and methods for making the fibers.

Claims

exact text as granted — not AI-modified
1 . A method for preparing individualized, glyoxal crosslinked cellulosic fibers having a wet bulk greater than about 20 cm 3 /g at 0.6 kPa, comprising: 
 (a) applying only an aqueous glyoxal solution to a cellulosic fibrous web to provide a web of treated fibers;    (b) separating the web of treated fibers into individual treated fibers; and    (c) heating the individual treated fibers at a temperature and for a time sufficient to provide individualized, crosslinked cellulosic fibers having a wet bulk greater than about 20 cm 3 /g at 0.6 kPa.    
     
     
         2 . The method of  claim 1 , wherein the glyoxal is applied in an amount from about 4 to about 15 percent by weight based on the total weight of fibers.  
     
     
         3 . The method of  claim 1 , wherein the glyoxal is applied in an amount from about 6 to about 10 percent by weight based on the weight of fibers.  
     
     
         4 . The method of  claim 1 , wherein the temperature is from about 135° C. to about 165° C.  
     
     
         5 . The method of  claim 1 , wherein the time is from about 3 to about 10 minutes.  
     
     
         6 . The method of  claim 1 , wherein the crosslinked fibers have a wet bulk is greater than about 22 cm 3 /g at 0.6 kPa.  
     
     
         7 . The method of  claim 1 , wherein the crosslinked fibers have a wet bulk is greater than about 25 cm 3 /g at 0.6 kPa.  
     
     
         8 . The method of  claim 1 , wherein the crosslinked fibers have a brightness greater than about 80% ISO.  
     
     
         9 . A method for preparing individualized, glyoxal crosslinked cellulosic fibers, consisting essentially of: 
 (a) applying an aqueous glyoxal solution to a cellulosic fibrous web to provide a web of treated fibers;    (b) separating the web of treated fibers into individual treated fibers; and    (c) heating the individual treated fibers at a temperature and for a time sufficient to provide individualized, crosslinked cellulosic fibers.    
     
     
         10 . The method of  claim 9 , wherein the glyoxal is applied in an amount from about 4 to about 15 percent by weight based on the total weight of fibers.  
     
     
         11 . The method of  claim 9 , wherein the temperature is from about 135° C. to about 165° C.  
     
     
         12 . The method of  claim 9 , wherein the time is from about 3 to about 10 minutes.  
     
     
         13 . The method of  claim 9 , wherein the crosslinked fibers have a wet bulk is greater than about 20 cm 3 /g at 0.6 kPa.  
     
     
         14 . The method of  claim 9 , wherein the crosslinked fibers have a brightness greater than about 80% ISO.  
     
     
         15 . A method for preparing individualized, glyoxal crosslinked cellulosic fibers, comprising: 
 (a) applying only an aqueous glyoxal solution to a cellulosic fibrous web to provide a web of treated fibers;    (b) separating the web of treated fibers into individual treated fibers; and    (c) heating the individual treated fibers at a temperature and for a time sufficient to provide individualized, crosslinked cellulosic fibers.    
     
     
         16 . The method of  claim 15 , wherein the glyoxal is applied in an amount from about 4 to about 15 percent by weight based on the total weight of fibers.  
     
     
         17 . The method of  claim 15 , wherein the temperature is from about 135° C. to about 165° C.  
     
     
         18 . The method of  claim 15 , wherein the time is from about 3 to about 10 minutes.  
     
     
         19 . The method of  claim 15 , wherein the crosslinked fibers have a wet bulk is greater than about 25 cm 3 /g at 0.6 kPa.  
     
     
         20 . The method of  claim 15 , wherein the crosslinked fibers have a brightness greater than about 80% ISO.

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