US2005133179A1PendingUtilityA1

Paper products and method of making

49
Assignee: WEYERHAEUSER COPriority: Dec 22, 2003Filed: Apr 13, 2004Published: Jun 23, 2005
Est. expiryDec 22, 2023(expired)· nominal 20-yr term from priority
Inventors:Michael DoughertyAmar N. NeogiDavid W. Park
D21H 19/385D21H 21/52D21H 23/50
49
PatentIndex Score
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Claims

Abstract

Coated or uncoated paper having small sized calcium carbonate placed on it has fewer voids than paper without the calcium carbonate place on it. Uncoated paper having small sized calcium carbonate placed on it has greater stiffness than the same weight of paper without calcium carbonate placed on it.

Claims

exact text as granted — not AI-modified
1 . A paper sheet having on the surface thereof calcium carbonate, 
 said calcium carbonate having a maximum mean average size of 200 nm,    said paper sheet having less than 20 voids per 12.6 in 2  in the 6000 th  sheet when tested in a Void Test.    
     
     
         2 . The paper sheet of  claim 1  wherein said calcium carbonate has a maximum mean average size of 100 nm.  
     
     
         3 . The paper sheet of  claim 1  wherein said calcium carbonate has a maximum mean average size of 50 nm.  
     
     
         4 . The paper sheet of  claim 1  having less than 15 voids per 12.6 in 2 .  
     
     
         5 . The paper sheet of  claim 4  wherein said calcium carbonate has a maximum mean average size of 100 nm.  
     
     
         6 . The paper sheet of  claim 4  wherein said calcium carbonate has a maximum mean average size of 50 nm.  
     
     
         7 . The paper sheet of  claim 1  having less than 10 voids per 12.6 in 2 .  
     
     
         8 . The paper sheet of  claim 7  wherein said calcium carbonate has a maximum mean average size of 100 nm.  
     
     
         9 . The paper sheet of  claim 7  wherein said calcium carbonate has a maximum mean average size of 50 nm.  
     
     
         10 . The paper sheet of  claim 1  in which said paper has a Gurley stiffness 10% greater than a paper not coated with said calcium carbonate.  
     
     
         11 . A paper sheet having on the surface thereof calcium carbonate, 
 said calcium carbonate having a maximum mean average size of 200 nm,    said paper sheet having a Gurley stiffness 10% greater than a paper not coated with said calcium carbonate.    
     
     
         12 . The paper sheet of  claim 11  wherein said calcium carbonate has a maximum mean average size of 100 nm.  
     
     
         13 . The paper sheet of  claim 11  wherein said calcium carbonate has a maximum mean average size of 50 nm.  
     
     
         14 . The paper sheet of  claim 11  wherein 
 said paper sheet has a Gurley stiffness 25% greater than a paper not coated with said calcium carbonate.    
     
     
         15 . The paper sheet of  claim 14  wherein said calcium carbonate has a maximum mean average size of 100 nm.  
     
     
         16 . The paper sheet of  claim 14  wherein said calcium carbonate has a maximum mean average size of 50 nm.

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