Method for preparing a polyolefin coating for a paper substrate

Abstract

The present invention relates to a method comprising the steps of a) applying onto paper a composition comprising an aqueous dispersion of poly-C2-C3-olefin particles, a dispersant, and a C5-C26-alkyl primary fatty amide; and b) drying the composition to form a coating having a coat weight in the range of from 1 g/m2 to 20 g/m2. The method of the present invention is useful for preparing coatings on paper with desirable moisture vapor transition rate and coefficient of friction properties.

1 . A method comprising the steps of a) applying onto paper a composition comprising an aqueous dispersion of poly-C 2 -C 3 -olefin particles, a dispersant, and a C 5 -C 26 -alkyl primary fatty amide; and b) drying the composition to form a coating having a coat weight in the range of from 1 g/m 2  to 20 g/m 2 . 
     
     
         2 . The method of  claim 1  wherein, based on the weight of the poly-C 2 -C 3 -olefin particles, the dispersant, and the C 5 -C 26 -alkyl primary fatty amide in the composition, the concentration of the polyolefin particles is in the range of from 40 to 95 weight percent; the concentration of the dispersant is in the range of from 4 to 50 weight percent; and the concentration of the C 5 -C 26 -alkyl primary fatty amide is in the range of from 0.5 to 5 weight percent. 
     
     
         3 . The method of  claim 2  wherein the dispersant is an ethylene-acrylic acid copolymer or a salt thereof, or an ethylene-methacrylic acid copolymer or a salt thereof; and the C 5 -C 26 -alkyl primary fatty amide is a C 10 -C 24 -alkyl primary fatty amide; and wherein the composition is dried to form a coating with a coat weight in the range of from 5 g/m 2  to 10 g/m 2 . 
     
     
         4 . The method of  claim 3  wherein the C 10 -C 24 -alkyl primary fatty amide is a C 16 -C 22 -alkyl primary fatty amide having a melting point in the range of from 50° C. to 115° C., and the poly-C 2 -C 3 -olefin particles are ethylene-C 4 -C 10 -α-olefin copolymer particles. 
     
     
         5 . The method of  claim 4  wherein the ethylene-C 4 -C 10 -α-olefin copolymer particles are ethylene-1-octene copolymer particles. 
     
     
         6 . The method of  claim 3  wherein the C 10 -C 24 -alkyl primary fatty amide is a C 16 -C 22 -alkyl primary fatty amide having a melting point in the range of from 50° C. to 115° C., and the poly-C 2 -C 3 -olefin particles are polypropylene particles. 
     
     
         7 . The method of  3  wherein the C 10 -C 24 -alkyl primary fatty amide is a C 16 -C 22 -alkyl primary fatty amide having a melting point in the range of from 50° C. to 115° C., and the poly-C 2 -C 3 -olefin particles are poly (ethylene-propylene) copolymers particles. 
     
     
         8 . The method of  claim 2  wherein, based on the weight of the poly-C 2 -C 3 -olefin particles, the dispersant, and the C 5 -C 26 -alkyl primary fatty amide, the
 concentration of the poly-C 2 -C 3 -olefin is in the range of from 60 to 90 weight percent; the concentration of the dispersant is in the range of from 9 to 40 weight percent; and 
 the concentration of the C 5 -C 26 -alkyl primary fatty amide is in the range of from 1 to 4 weight percent. 
 
     
     
         9 . The method of  claim 4  wherein, based on the weight of the poly-C 2 -C 3 -olefin particles, the dispersant, and the C 16 -C 22 -alkyl primary fatty amide, the concentration of the poly-C 2 -C 3 -olefin is in the range of from 60 to 90 weight percent; the concentration of the dispersant is in the range of from 9 to 40 weight percent; and the concentration of the C 16 -C 22 -alkyl primary fatty amide is in the range of from 1 to 4 weight percent.