Odor control pulp composition

Abstract

The present technology is directed to fluff pulps with improved odor control as well as methods of making such fluff pulps. A fluff pulp is provided that includes a bleached kraft fiber and a copper ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber. The bleached kraft fiber includes a length-weighted average fiber length of at least about 2 mm, a copper number of less than about 7, a carboxyl content of more than about 3.5 meq/100 grams; an ISO brightness of at least 80; and a viscosity from about 2 cps to about 9 cps.

1 . A fluff pulp comprising:
 bleached kraft fiber comprising
 a length-weighted average fiber length of at least about 2 mm; 
 a copper number of less than about 7; and 
 a ISO brightness of at least 80, and 
   a copper ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber.   
     
     
         2 . The fluff pulp of  claim 1 , wherein copper ions of the copper ion content comprise a copper (I) salt, a copper (II) salt, hydrates thereof, or a combination of any two or more thereof. 
     
     
         3 . The fluff pulp of  claim 1 , wherein copper ions of the copper ion content comprise one or more of elemental copper, copper (I)chloride, copper (I) oxide, copper (I) sulfate, copper (II) carbonate, copper (II) chloride, copper (II) phosphate, copper(II) nitrate, copper (II) perchlorate, copper (II) phosphate, copper (II) sulfate, copper (II) tetrafluoroborate, and copper (II) triflate. 
     
     
         4 . The fluff pulp of  claim 1 ,wherein the fluff pulp further comprises iron ions. 
     
     
         5 . The fluff pulp of  claim 4 , wherein the fluff pulp comprises an iron ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber. 
     
     
         6 . The fluff pulp of  claim 1 , wherein the fluff pulp does not comprise a super-absorbent polymer (SAP). 
     
     
         7 . The fluff pulp of  claim 1 , wherein the fluff pulp has a carboxyl content of more than about 3.5 meq/100 grams. 
     
     
         8 . The fluff pulp of  claim 1 , where the fluff pulp has a copper ion content of from about 0.7 to 3.7 ppm by weight of the bleached kraft fiber. 
     
     
         9 . The fluff pulp of  claim 1 , where the fluff pulp inhibits the effect on ammonia formation to 22 ppm or less of ammonia eight (8) hours after the fluff pulp is subjected to an ammonia generation test in the absence of super-absorbent polymer (SAP), the ammonia generation test consisting of steps of:
 i) the fluff pulp is cut into 2 inch strips and fiberized using a Kamas H01 laboratory Hammermill creating a fiberized fluff pulp;   ii) the fiberized fluff pulp is made into an airlaid 50 mm diameter pad using an airlaid pad former;   iii) each pad is made with 4 grams of fiberized fluff pulp and compressed in a carver press to approximately 0.15 g/cc density;   iv) two compressed pads are placed in an airtight 1 liter bottle;   v) 40 mL of a freshly prepared 1.0% solution of urease (Urease from Canavalia ensiformis (Jack Bean), purchased from Sigma) in synthetic urine (RICCA Chemical Company) is added to each 4 gram pad and the bottle is sealed; and   vi) a Draeger Tube is used to detect the ammonia concentration in the headspace of the bottle.   
     
     
         10 . A process for preparing the fluff pulp of  claim 1  comprising:
 treating the bleached kraft fiber by adding from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber of copper or salts thereof to produce the fluff pulp; 
 wherein 
 the fluff pulp has at least 50% greater inhibiting effect on ammonia formation than a second bleached kraft fiber formed by the same process absent copper. 
 
     
     
         11 . The process of  claim 10 , wherein the copper or salts thereof consist of one or more of elemental copper (Cu 0 ),a copper (I) salt, and a copper (II) salt. 
     
     
         12 . The process of  claim 10 , wherein the copper or salts thereof consist of elemental copper, copper (I)chloride, copper (I) oxide, copper (I)sulfate, copper (II) carbonate, copper (II) chloride, copper (II) phosphate, copper(II) nitrate, copper (II) perchlorate, copper (II) phosphate, copper (II) sulfate, copper (II) tetrafluoroborate, copper (II) triflate, hydrates thereof, or combinations of any two or more thereof. 
     
     
         13 . The process of  claim 10 , further comprising bleaching a kraft fiber with a multi-step bleaching process to produce a bleached kraft fiber, wherein the treating occurs after the bleaching. 
     
     
         14 . The process of  claim 10 , further comprising bleaching a kraft fiber with a multi-step bleaching process to produce a bleached kraft fiber, wherein no further bleaching is performed after the treating. 
     
     
         15 . The process of  claim 10 , wherein the fluff pulp does not comprise a super-absorbent polymer (SAP). 
     
     
         16 . The process of  claim 10 , wherein the fluff pulp has a carboxyl content of more than about 3.5 meq/100 grams. 
     
     
         17 . The process of  claim 10 , wherein the fluff pulp further comprises iron ions. 
     
     
         18 . The fluff pulp of  claim 17 , wherein the fluff pulp comprises an iron ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber. 
     
     
         19 . A process for improving odor control properties of a fluff pulp, the process comprising:
 treating the bleached kraft fiber by adding from about 0.2 ppm to about 50 ppm by weight of the lignocellulosic material of copper or salts thereof to produce the fluff pulp;   wherein   the fluff pulp has at least 50% greater inhibiting effect on ammonia formation than a second treated lignocellulosic material formed by the same process absent copper.   
     
     
         20 . The process of  claim 19 , wherein the fluff pulp does not comprise a super-absorbent polymer (SAP). 
     
     
         21 . The process of  claim 19 , wherein the fluff pulp comprises from 0.7 to 3.7 ppm of copper ions by weight of the fluff pulp. 
     
     
         22 . The process of  claim 19 , wherein the fluff pulp further comprises iron ions. 
     
     
         23 . The fluff pulp of  claim 22 , wherein the fluff pulp comprises an iron ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber.