US2014182801A1PendingUtilityA1

Pulp composition

54
Individually held — no corporate assignee on recordPriority: Aug 30, 2011Filed: Aug 30, 2012Published: Jul 3, 2014
Est. expiryAug 30, 2031(~5.1 yrs left)· nominal 20-yr term from priority
Inventors:Brent A. HawkinsFred E. Martin
D21C 3/02D21C 3/003D21C 9/10D21H 21/32D21H 17/64D21C 3/024D21H 17/74D21H 17/06D21C 3/222D21H 11/12D21C 5/00
54
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Claims

Abstract

One aspect of the invention relates to a pulp composition made from agricultural renewable fibers (ARF) having low Kappa number with unexpected quality sufficient for papermaking (e.g., high strength parameters and high freeness). Another aspect of the invention relates to an ARF pulp having ISO brightness of 60% or higher, and unexpected quality sufficient for papermaking (e.g. high strength parameters and high freeness). Another aspect of the invention relates to a pulp composition made from a pulping process comprising using a high concentration of anthraquinone (AQ). The pulping process can use wood or nonwood fibers (e.g., bagasse and corn stover) to provide pulp having good paper-making quality.

Claims

exact text as granted — not AI-modified
1 . A pulp composition comprising:
 fibers from an agricultural renewable fiber source, wherein the pulp composition has an unbleached Kappa number of about 15 or less, a high freeness, and a tensile of at least about 5.50 km, a tear index of at least about 6.00 mN·m 2 /g, and a burst index of at least about 3.00 kPa·m 2 /g.   
     
     
         2 . The pulp composition of  claim 1 , wherein the Kappa number is about 10 or less. 
     
     
         3 . The pulp composition of  claim 1 , wherein the Kappa number is about 5 or less. 
     
     
         4 . The pulp composition of  claim 1 , wherein the agricultural renewable fiber source is bagasse or corn stover. 
     
     
         5 . The pulp composition of  claim 2 , wherein the agricultural renewable fiber source is bagasse or corn stover. 
     
     
         6 . The pulp composition of  claim 3 , wherein the agricultural renewable fiber source is bagasse or corn stover. 
     
     
         7 . A pulp composition comprising fibers from an agricultural renewable fiber source, wherein the pulp composition has an unbleached Kappa number of about 15 or less, a high freeness, and strength parameters sufficient for papermaking. 
     
     
         8 . The pulp composition of  claim 7 , wherein the pulp composition has a tensile of at least about 5.50 km, a tear index of at least about 6.00 mN·m 2 /g, and a burst index of at least about 3.00 kPa·m 2 /g. 
     
     
         9 . The pulp composition of  claim 7 , wherein the ISO brightness is less than 50% ISO. 
     
     
         10 . The pulp composition of  claim 7 , wherein the ISO brightness is about 70% or higher. 
     
     
         11 . The pulp composition of  claim 7 , wherein the ISO brightness is about 80% or higher. 
     
     
         12 . The pulp composition of  claim 8 , wherein the ISO brightness is about 80% or higher. 
     
     
         13 . The pulp composition of  claim 7 , wherein the ISO brightness is about 88% or higher. 
     
     
         14 . The pulp composition of  claim 8 , wherein the ISO brightness is about 88% or higher. 
     
     
         15 . The pulp composition of  claim 7 , wherein the ISO brightness is about 90% or higher. 
     
     
         16 . The pulp composition of  claim 8 , wherein the ISO brightness is about 90% or higher. 
     
     
         17 . The pulp composition of  claim 7 , wherein the ARFs are bagasse or corn stover. 
     
     
         18 . The pulp composition of  claim 8 , wherein the ARFs are bagasse or corn stover. 
     
     
         19 . The pulp composition of  claim 12 , wherein the ARFs are bagasse or corn stover. 
     
     
         20 . The pulp composition of  claim 14 , wherein the ARFs are bagasse or corn stover. 
     
     
         21 . The pulp composition of  claim 16 , wherein the ARFs are bagasse or corn stover. 
     
     
         22 . A pulp composition made from a pulping method comprising:
 providing a first mixture comprising the reaction products of:
 fibers, 
 water, 
 anthraquinone or derivative thereof having concentration of about 0.1% by weight or greater of the dry fiber, and 
 an alkali, 
 wherein the mixture has a liquid to dry fiber ratio from about 4 to about 10, and an initial Kappa number of about 60 or greater; and 
   reacting the mixture for a cooking time and at a cooking condition sufficient to form a second mixture having a Kappa number of about 15 or less, high freeness, and strength parameters sufficient for papermaking.   
     
     
         23 . The pulp composition of  claim 22 , wherein the strength parameters sufficient for papermaking are selected from the group consisting of a tensile of at least about 5.50 km, a tear index of at least about 6.00 mN·m 2 /g, a burst index of at least about 3.00 kPa·m 2 /g, or a combination thereof. 
     
     
         24 . The pulp composition of  claim 23 , wherein the cooking condition and cooking time provides an H-factor of about 200 or higher. 
     
     
         25 . The pulp composition of  claim 24 , wherein the H-factor is about 1000 or higher. 
     
     
         26 . The pulp composition of  claim 23 , wherein the second mixture has a Kappa number of about 10 or less. 
     
     
         27 . The pulp composition of  claim 23 , wherein the second mixture has a Kappa number of about 5 or less. 
     
     
         28 . The pulp composition of  claim 23 , wherein the fibers comprise agricultural renewable fibers. 
     
     
         29 . The pulp composition of  claim 28 , wherein the agricultural renewable fibers comprise bagasse or corn stover. 
     
     
         30 . The pulp composition of  claim 23 , wherein the fibers comprise wood fibers. 
     
     
         31 . The pulp composition of  claim 31 , wherein the wood fibers comprise pine wood fibers. 
     
     
         32 . The pulp composition of  claim 23 , wherein the pulping method further comprises bleaching the second mixture. 
     
     
         33 . The pulp composition of  claim 28 , wherein the pulp has an ISO brightness of less than 50%. 
     
     
         34 . The pulp composition of  claim 28 , wherein the pulp has an ISO brightness of about 70% or higher. 
     
     
         35 . The pulp composition of  claim 28 , wherein the pulp has an ISO brightness of about 80% or higher. 
     
     
         36 . The pulp composition of  claim 28 , wherein the pulp has an ISO brightness of about 85% or higher. 
     
     
         37 . The pulp composition of  claim 28 , wherein the pulp has an ISO brightness of about 90% or higher.

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