Oxidized cellulose containing packaging materials

Abstract

This disclosure relates to improved packaging materials containing oxidized cellulose. More particularly, this disclosure relates to improved packaging materials containing oxidized cellulose exhibiting one or more of improved odor control and/or improved antimicrobial properties. This disclosure further relates to the use of oxidized cellulose in packaging materials as an anti-counterfeiting agent, and methods of testing for the same.

1 - 28 . (canceled) 
     
     
         29 . A packaging material comprising:
 an oxidized softwood kraft cellulose comprising a copper number of at least about 1.5, a carboxyl content of at least about 3 meq/100 g, a 0.5% capillary CED viscosity of less than about 10 mPa·s, and a length-weighted average fiber length of at least about 2 mm; wherein the packaging material is a boxboard, carton, corrugated box, fiberboard, paperboard, liquid packaging board, or cup stock.   
     
     
         30 . The packaging material of  claim 29 , wherein the oxidized cellulose comprises a copper number of from about 3 to about 5. 
     
     
         31 . The packaging material of  claim 29 , wherein the oxidized cellulose comprises a carboxyl content of from about 6 meq/100 g to about 12 meq/100 g. 
     
     
         32 . The packaging material of  claim 29 , wherein the oxidized cellulose comprises a CED viscosity of less than about 7 mPa·s. 
     
     
         33 . The packaging material of  claim 29 , wherein the oxidized cellulose is unbleached. 
     
     
         34 . The packaging material of  claim 29 , wherein the oxidized cellulose is bleached. 
     
     
         35 . The packaging material of  claim 34 , wherein the oxidized cellulose comprises an ISO brightness of at least about 88%. 
     
     
         36 . The packaging material of  claim 29 , wherein the oxidized cellulose has been oxidized with hydrogen peroxide and a catalyst comprising iron, copper, or both under acidic conditions. 
     
     
         37 . The packaging material of  claim 36 , wherein the oxidized cellulose has an iron content of less than 10 ppm and a copper content of less than 10 ppm. 
     
     
         38 . The packaging material of  claim 29 , wherein the oxidized cellulose absorbs at least about 5 ppm ammonia per gram of oxidized cellulose. 
     
     
         39 . The packaging material of  claim 29 , wherein the oxidized cellulose has a bacteriostatic activity after 4 hours of at least 2.5 and a bactericidal activity at 4 hours of at least 1.5. 
     
     
         40 . The packaging material of  claim 29 , wherein the oxidized cellulose is incorporated into the packaging material in an amount of at least about 5% weight oxidized cellulose by weight of the packaging material. 
     
     
         41 . The packaging material of  claim 29 , wherein the oxidized cellulose is incorporated into the packaging material in an amount of at least about 20% weight oxidized cellulose by weight of the packaging material. 
     
     
         42 . The packaging material of  claim 29 , wherein the oxidized cellulose is incorporated into the packaging material in an amount of at least about 50% weight oxidized cellulose by weight of the packaging material.