US2006207738A1PendingUtilityA1

Paper substrates useful in wallboard tape applications

58
Individually held — no corporate assignee on recordPriority: Mar 16, 2005Filed: Mar 16, 2006Published: Sep 21, 2006
Est. expiryMar 16, 2025(expired)· nominal 20-yr term from priority
Inventors:Martha Patricia Wild
D21H 27/20D21H 19/12D21H 17/28D21H 17/36
58
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Claims

Abstract

A paper substrate, particularly useful in wallboard tape applications containing PVOH on and/or in at least one surface of the paper, as well as methods of making and using the same. The use of the tape of the invention is used in conjunction with a joint compound that may contain no or reduced amounts of bonding agent.

Claims

exact text as granted — not AI-modified
1 . A paper substrate, comprising 
 a web of cellulose fibers; and    polyvinyl alcohol.    
   
   
       2 . The paper substrate according to  claim 1 , comprising polyvinyl alcohol on and/or within the web of cellulose fibers.  
   
   
       3 . The paper substrate according to  claim 1 , wherein said substrate is wallboard tape.  
   
   
       4 . The paper substrate according to  claim 1 , wherein said paper substrate is neutral, acidic or alkaline.  
   
   
       5 . The paper substrate according to  claim 1 , wherein a surface of the substrate is abraded.  
   
   
       6 . The paper substrate according to  claim 1 , comprising from 0.05 to 20 wt % polyvinyl alcohol based on the total weight of the substrate.  
   
   
       7 . The paper substrate according to  claim 1 , further comprising starch.  
   
   
       8 . The paper substrate according to  claim 1 , further comprising from 0.05 to 20 wt % starch based on the total weight of the substrate.  
   
   
       9 . The paper substrate according to  claim 1 , wherein said polyvinyl alcohol is from 75 to 100% hydrolyzed.  
   
   
       10 . The paper substrate according to  claim 1 , wherein said substrate has a basis weight of from 50 to 120 lbs/3000 sq. ft.  
   
   
       11 . The paper substrate according to  claim 1 , wherein the substrate has a CD tensile of from to 60 lbf/inch width as measured by TAPPI method 494.  
   
   
       12 . The paper substrate according to  claim 1 , wherein the substrate has a MD tensile of from 25 to 100 lbf/inch width as measured by TAPPI method 494.  
   
   
       13 . A method of making the paper substrate according to  claim 1 , comprising contacting the polyvinyl alcohol with the cellulose fibers.  
   
   
       14 . The method according to  claim 13 , wherein said contacting occurs during at least one point in the paper-making process, said point selected from at least one member selected from the group consisting of the head box, size press, water box and coater.  
   
   
       15 . The method according to  claim 13 , wherein said contacting occurs at the size press.  
   
   
       16 . The method according to  claim 13 , further comprising contacting the fibers with starch.  
   
   
       17 . The method according to  claim 16 , comprising contacting the fibers with starch and polyvinyl alcohol at the same time.  
   
   
       18 . The method according to  claim 16 , comprising contacting the fibers with starch and polyvinyl alcohol at the same time so that the ratio of starch/polyvinyl alcohol is from 99 wt % starch/1 wt % polyvinyl alcohol to 5 wt % starch/95 wt % polyvinyl alcohol, wherein the wt % is based upon the total weight of the starch and polyvinyl alcohol.  
   
   
       19 . The method according to  claim 13 , wherein the fibers are contacted with polyvinyl alcohol at the size press at a wt % solids from 1 to 10 wt % in aqueous solution based upon the total weight of the solution.  
   
   
       20 . The method according to  claim 13 , further comprising abrading at least one surface of the substrate.

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