Method for manufacturing a paper having improved impermeability to grease and oil, paper manufactured, and use thereof

Abstract

The present invention relates to a method for manufacturing a paper having improved impermeability to grease and oil, comprising the following steps: (a) providing a paper with a first surface and a second surface; (b) applying an aqueous solution to the first surface, wherein the aqueous solution comprises from approximately 10 to approximately 50 weight % of collagen hydrolysate and at least approximately 0.1 weight % of a plasticizer; (c) drying the aqueous solution in order to obtain a coating comprising collagen hydrolysate and plasticizer on the first surface.

1 . A method for manufacturing a paper having improved impermeability to grease and oil, comprising the following steps:
 providing a paper with a first surface and a second surface;   applying an aqueous solution to the first surface, wherein the aqueous solution comprises from approximately 10 to approximately 50 weight % of collagen hydrolysate and at least approximately 0.1 weight % of a plasticizer;   drying the aqueous solution in order to obtain a coating comprising collagen hydrolysate and plasticizer on the first surface.   
     
     
         2 . The method according to  claim 1 , wherein the plasticizer is selected from sugar alcohols, in particular glycerol, sorbitol or mixtures of these. 
     
     
         3 . The method according to  claim 1 , wherein the paper is a paper based on chemical pulp, mechanical pulp and/or waste paper pulp. 
     
     
         4 . The method according to  claim 1 , wherein the paper has a weight per surface area of from approximately 60 to approximately 200 g/m 2 . 
     
     
         5 . The method according to  claim 1 , wherein the aqueous solution comprises from approximately 20 to approximately 45 weight % of collagen hydrolysate. 
     
     
         6 . The method according to  claim 1 , wherein the collagen hydrolysate is produced by chemical or enzymatic hydrolysis of starting materials of animal origin containing collagen. 
     
     
         7 . The method according to  claim 1 , wherein the collagen hydrolysate is produced by recombinant gene expression. 
     
     
         8 . The method according to  claim 1 , wherein the collagen hydrolysate has an average molecular weight of from approximately 500 to approximately 25,000 Da. 
     
     
         9 . The method according to  claim 1 , wherein the aqueous solution comprises up to approximately 5 weight % of plasticizer. 
     
     
         10 . The method according to  claim 1 , wherein the aqueous solution is applied at a temperature of the solution of from approximately 40 to approximately 60° C. 
     
     
         11 . The method according to  claim 1 , wherein application of the aqueous solution is performed by spraying, using a roller, scraping, by using a coater, a film press or a size press, or by curtain-coating. 
     
     
         12 . The method according to  claim 1 , wherein the quantity of aqueous solution applied is selected such that after drying the result is a weight by surface area of the coating that comprises collagen hydrolysate and plasticizer of from approximately 8 to approximately 20 g/m 2 . 
     
     
         13 . The method according to  claim 1 , wherein drying of the aqueous solution is performed at a temperature of from approximately 30 to approximately 70° C. 
     
     
         14 . The method according to  claim 1 , wherein the aqueous solution further comprises additives, which are selected from pigments dispersed in the aqueous solution, binders, crosslinking agents, and/or sizing agents. 
     
     
         15 . The method according to  claim 1 , further comprising the following steps:
 (b2) applying an aqueous solution to the second surface, wherein the aqueous solution comprises from approximately 30 to approximately 50 weight % of collagen hydrolysate and at least approximately 0.1 weight % of a plasticizer;   (c2) drying the aqueous solution in order to obtain a coating comprising collagen hydrolysate and plasticizer on the second surface.   
     
     
         16 . The method according to  claim 15 , wherein steps (b) and (b2) are carried out simultaneously and steps (c) and (c2) are carried out simultaneously, or wherein steps (b2) and (c2) are carried out after steps (b) and (c). 
     
     
         17 . A paper having improved impermeability to grease and oil, obtainable by the method according to  claim 1 . 
     
     
         18 . The paper according to  claim 17 , wherein the first surface of the paper has a kit value of 10 or above, determined in conformance with the TAPPI test protocol T 559 cm-12. 
     
     
         19 . The paper according to  claim 17 , wherein the paper is a packing material for packing oily or greasy foodstuffs, or for cosmetics. 
     
     
         20 . The paper according to  claim 17 , wherein the paper is a baking paper.