Method for coating a paper substrate by using a modified cutin extract

Abstract

The present invention relates to a method for coating a paper substrate comprising: I) providing a paper substrate; ii) applying to the paper substrate an aqueous barrier coating composition having a solids content from 10 to 60 wt % (% by weight) and comprising from 20 to 100 wt % of a modified cutin extract, wherein said modified cutin extract is obtained by thermal treatment of a raw cutin extract at a temperature comprised between 40 and 120° C.

1 . A method for coating a paper substrate comprising:
 i) providing a paper substrate;   ii) applying to the paper substrate an aqueous barrier coating composition having a solids content from 10 to 60 wt % (% by weight) and comprising from 20 to 100 wt % of a modified cutin extract, wherein said modified cutin extract is obtained by thermal treatment of a raw cutin extract at a temperature comprised between 4° and 120° C.   
     
     
         2 . The method for coating a paper substrate according to  claim 1 , wherein the aqueous barrier coating composition comprises from 50 to 100 wt % of modified cutin extract. 
     
     
         3 . The method for coating a paper substrate according to  claim 1 , wherein the thermal treatment of the raw cutin extract is carried out at a temperature comprised between 6° and 100° C. 
     
     
         4 . The method for coating a paper substrate according to  claim 1 , wherein the thermal treatment of the raw cutin extract is carried out at a pH ranging from 2 to 7. 
     
     
         5 . The method for coating a paper substrate according to  claim 1 , wherein the thermal treatment of the raw cutin extract is carried out at a pH ranging from 7 to 12. 
     
     
         6 . The method for coating a paper substrate according to  claim 1 , wherein the raw cutin extract has a dry content ranging from 30 to 95 wt %. 
     
     
         7 . The method for coating a paper substrate according to  claim 1 , wherein the raw cutin extract has a pH ranging from 3 to 6. 
     
     
         8 . The method for coating a paper substrate according to  claim 1 , wherein the modified cutin extract has a dry content ranging from 10 to 60 wt %. 
     
     
         9 . The method for coating a paper substrate according to  claim 1 , wherein the modified cutin extract has a pH ranging from 6 to 11. 
     
     
         10 . The method for coating a paper substrate according to  claim 1 , wherein the aqueous barrier coating composition further comprises pigments, binders, waxes, thickeners, antiblocking agents, dyes, flow control agents or defoamers.