Polysaccharide coatings for paper

Abstract

Coating compositions that can provide grease and oil resistant coating for substrates, especially paper and textile substrates, are disclosed. The coating compositions comprise water insoluble α-(1,3→glucan) polymer and/or dextran polymer and optionally other additives.

1 - 18 . (canceled) 
     
     
         19 . A coated substrate that comprises: a substrate and wherein at least a portion of the substrate is coated with a continuous layer of a coating composition,
 wherein the coating composition comprises alkyl ketene dimer and water-insoluble α-1,3-glucan polymer having 90% or greater α-1,3-glycosidic linkages.   
     
     
         20 . The coated substrate of  claim 19 , wherein the water-insoluble α-1,3-glucan polymer comprises greater than or equal to 95% α-1,3-glycosidic linkages. 
     
     
         21 . The coated substrate of  claim 20 , wherein the water-insoluble α-1,3-glucan polymer has greater than or equal to 99% α-1,3-glycosidic linkages. 
     
     
         22 . The coated substrate of  claim 19 , wherein the water-insoluble α-1,3-glucan polymer has less than 1% α-1,3,6-glycosidic branch points. 
     
     
         23 . The coated substrate of  claim 19 , wherein the water-insoluble α-1,3-glucan polymer has a number average degree of polymerization in the range of 55 to 10,000. 
     
     
         24 . The coated substrate of  claim 23 , wherein the number average degree of polymerization is in the range of 75 to 1,000. 
     
     
         25 . The coated substrate of  claim 19 , wherein the coating composition further comprises one or more additives. 
     
     
         26 . The coated substrate of  claim 19 , wherein the coating composition is essentially free from starch or hydroxyalkyl starch. 
     
     
         27 . The coated substrate of  claim 19 , wherein the continuous layer is dry and has a thickness in the range of 0.1 to 50 micrometers. 
     
     
         28 . The coated substrate of  claim 19 , wherein the substrate is paper, paper board, cardboard, or corrugated board. 
     
     
         29 . The coated substrate of  claim 19 , wherein the coated substrate resists grease. 
     
     
         30 . The coated substrate of  claim 19 , wherein grease is in contact with the continuous layer of the coating composition, but the grease is not in contact with the substrate. 
     
     
         31 . The coated substrate of  claim 19 , wherein the coated substrate resists oil. 
     
     
         32 . The coated substrate of  claim 19 , wherein oil is in contact with the continuous layer of the coating composition, but the oil is not in contact with the substrate.