Film composition for paper thermal lamination application

Abstract

Provided is a multilayer film comprising a skin layer comprising an anhydride and/or carboxylic acid functionalized ethylene/alpha-olefin interpolymer having a melting point in the range of from 50 to 89 ° C., wherein the anhydride and/or carboxylic acid is present in an amount of from 0.02 to 0.3 percent by weight of the polyethylene based resin. The multilayer film further comprises a substrate layer comprising a resin selected from the group consisting of polypropylene or polyethylene terephthalate.

1 . A multilayer film comprising
 a. a skin layer comprising an anhydride and/or carboxylic acid functionalized ethylene/alpha-olefin interpolymer having a melting point in the range of from 50 to 89° C., wherein the anhydride or carboxylic acid functionality is present in an amount of from 0.02 to 0.3 percent by weight of the polyethylene based resin; and   b. a substrate layer comprising a resin selected from the group consisting of polypropylene or polyethylene terephthalate.   
     
     
         2 . The film of  claim 1  wherein the skin layer has a thickness in the range of from 3 to 50 microns. 
     
     
         3 . The film of  claim 1  wherein the skin layer has a thickness in the range of from 4 to 12 microns. 
     
     
         4 . The film of  claim 1  wherein the skin layer has a thickness in the range of from 10 to 30 microns. 
     
     
         5 . The film of  claim 1  further comprising one or more additional layers. 
     
     
         6 . The film of  claim 5  wherein the film comprises a primer coating between the substrate layer and the skin layer. 
     
     
         7 . The film of  claim 1  wherein an additional layer is a barrier layer. 
     
     
         8 . The film of  claim 1  wherein the substrate layer is biaxially oriented. 
     
     
         9 . The film of  claim 1  wherein the anhydride and/or carboxylic containing functionality is maleic anhydride. 
     
     
         10 . The film of  claim 9  wherein the maleic anhydride grafted polyethylene based resin has a melting point in the range of 50 to 89° C. 
     
     
         11 . The film of  claim 1  wherein the substrate layer has a thickness in the range of from 10 to 50 microns. 
     
     
         12 . The film of  claim 1  wherein the substrate layer has a thickness in the range of from 10 to 20 microns. 
     
     
         13 . The film of  claim 1  wherein the film has an overall thickness in the range of from 10 to 100 microns. 
     
     
         14 . The film of  claim 1  wherein the skin layer has been surface treated by corona, flame or plasma and has a surface tension of greater than or equal to 36 dynes. 
     
     
         15 . A thermally laminated paper structure comprising
 a. the multilayer film of  claim 1 ;   b. a paper substrate.