US2024133120A1PendingUtilityA1

Processes for imparting oil and grease resistance to paper products

66
Assignee: ECOLAB USA INCPriority: Oct 11, 2022Filed: Oct 6, 2023Published: Apr 25, 2024
Est. expiryOct 11, 2042(~16.2 yrs left)· nominal 20-yr term from priority
Inventors:William C. JohnsonVictoria R. Holmes
D21H 21/16D21H 17/16D21H 17/28D21H 19/12D21H 23/66D21H 23/72D21H 27/10D21J 1/08D21H 17/15D21H 19/18D21H 17/37D21H 19/20
66
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Claims

Abstract

Processes for imparting oil and grease resistance to paper products. In some embodiments, the process can include combining a plurality of fibers and water to produce a slurry; forming the slurry into a wet web; pressing and draining the wet web to produce a wet sheet; and drying the wet sheet to produce a dried sheet. A sizing composition and a barrier compound can independently be applied to at least one of the slurry, the wet web, the wet sheet, and the dried sheet. The sizing composition can include one or more alkenyl succinic anhydride compounds. The barrier compound can include a polyolefin dispersion, a styrene acrylate emulsion, a sucrose ester, a modified starch, styrene maleic anhydride, an ethylene acrylic acid dispersion, a styrene acrylic acid, a polyvinyl alcohol, an ethylene vinyl alcohol, or a mixture thereof. The dried sheet can have an average KIT Value of at least 3.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A process for imparting oil and grease resistance to a paper product, comprising:
 combining a plurality of fibers and water to produce a slurry;   forming the slurry into a wet paper web;   pressing and draining the wet paper web to produce a wet paper sheet; and   drying the wet paper sheet to produce a dried paper sheet, wherein:
 a sizing composition is applied to the slurry, applied to the wet paper web, applied to the wet paper sheet, applied to the dried paper sheet, or a combination thereof, 
 a barrier compound is applied to the dried paper sheet, 
 the sizing composition comprises one or more alkenyl succinic anhydride compounds, 
 the barrier compound comprises a polyolefin dispersion, a styrene acrylate emulsion, a sucrose ester, a modified starch, styrene maleic anhydride, an ethylene acrylic acid dispersion, a styrene acrylic acid, a polyvinyl alcohol, an ethylene vinyl alcohol, or a mixture thereof, and 
 the dried paper sheet has an average KIT Value of at least 3. 
   
     
     
         2 . The process of  claim 1 , wherein the one or more alkenyl succinic anhydride compounds comprise dodecenylsuccinic anhydride, tridecenylsuccinic anhydride, tetradecenylsuccinic anhydride, pentadecenylsuccinic anhydride, hexadecenylsuccinic anhydride, heptadecenylsuccinic anhydride, octadecenylsuccinic anhydride, nonadecenylsuccinic anhydride, eicosenylsuccinic anhydride, henicosenylsuccinic anhydride, docosenylsuccinc anhydride, tricosenylsuccinic anhydride, tetracosenylsuccinic anhydride, pentacosenylsuccinic anhydride, hexacosenylsuccinic anhydride, or a mixture thereof. 
     
     
         3 . The process of  claim 1 , wherein the one or more alkenyl succinic anhydride compounds has a chemical formula of: 
       
         
           
           
               
               
           
         
         wherein R 1  and R 2  are independently a C 1  to a C 20  alkyl group. 
       
     
     
         4 . The process of  claim 3 , wherein each of R 1  and R 2  is a C 7  alkyl group, a C 8  alkyl group, a C 9  alkyl group, a C 10  alkyl group, a C 11  alkyl group, or a C 12  alkyl group. 
     
     
         5 . The process of  claim 1 , wherein the dried paper sheet comprises up to 4 grams of the barrier compound per square meter of the dried paper sheet. 
     
     
         6 . The process of  claim 1 , wherein the dried paper sheet is a liquid packaging board, a molded fiber product, a fast-food wrapping paper, a fast food board, a grease proof label, or an oil proof paper sheet. 
     
     
         7 . The process of  claim 1 , wherein the dried paper sheet has a moisture content of about 0.1 wt % to about 12 wt %, based on the weight of the dried paper sheet. 
     
     
         8 . The process of  claim 1 , wherein the dried paper sheet comprises up to 4 grams of the barrier compound per square meter of the dried paper sheet. 
     
     
         9 . The process of  claim 1 , wherein the average KIT Value is at least 5. 
     
     
         10 . A process for imparting oil and grease resistance to a paper product, comprising:
 combining a plurality of fibers and water to produce a slurry;   forming the slurry into a wet paper web;   pressing and draining the wet paper web to produce a wet paper sheet; and   drying the wet paper sheet to produce a dried paper sheet, wherein:
 a sizing composition is applied to the slurry, applied to the wet paper web, applied to the wet paper sheet, applied to the dried paper sheet, or a combination thereof, 
 a barrier compound is applied to the slurry, applied to the wet paper web, applied to the wet paper sheet, applied to the dried paper sheet, or a combination thereof, 
 the sizing composition comprises one or more alkenyl succinic anhydride compounds, 
 the barrier compound comprises a fluorochemical compound, a wax emulsion, or a mixture thereof, and 
 the dried paper sheet has an average KIT Value of at least 3. 
   
     
     
         11 . The process of  claim 10 , wherein the one or more alkenyl succinic anhydride compounds comprise dodecenylsuccinic anhydride, tridecenylsuccinic anhydride, tetradecenylsuccinic anhydride, pentadecenylsuccinic anhydride, hexadecenylsuccinic anhydride, heptadecenylsuccinic anhydride, octadecenylsuccinic anhydride, nonadecenylsuccinic anhydride, eicosenylsuccinic anhydride, henicosenylsuccinic anhydride, docosenylsuccinc anhydride, tricosenylsuccinic anhydride, tetracosenylsuccinic anhydride, pentacosenylsuccinic anhydride, hexacosenylsuccinic anhydride, or a mixture thereof. 
     
     
         12 . The process of  claim 10 , wherein the one or more alkenyl succinic anhydride compounds has a chemical formula of: 
       
         
           
           
               
               
           
         
         wherein R 1  and R 2  are independently a C 1  to a C 20  alkyl group. 
       
     
     
         13 . The process of  claim 12 , wherein each of R 1  and R 2  is a C 7  alkyl group, a C 8  alkyl group, a C 9  alkyl group, a C 10  alkyl group, a C 11  alkyl group, or a C 12  alkyl group. 
     
     
         14 . The process of  claim 10 , wherein the barrier compound comprises the fluorochemical compound, and wherein the fluorochemical compound comprises an anionic fluorochemical, a cationic fluorochemical, an amphoteric fluorochemical, a non-ionic fluorochemical, a polymeric fluorochemical, a hybrid fluorochemical, a fluorochemical allophanate, a fluorochemical polyacrylate, a fluorochemical urethane, a fluorochemical carbodiimide, a fluorochemical guanidine, or a mixture thereof. 
     
     
         15 . The process of  claim 10 , wherein the barrier compound comprises the fluorochemical compound, and wherein the fluorochemical compound comprises one or more perfluoroalkyl compounds. 
     
     
         16 . The process of  claim 15 , wherein the dried paper sheet comprises from 0.45 kg to 2.3 kg of the fluorochemical compound per 907 kg of the dried paper sheet. 
     
     
         17 . The process of  claim 10 , wherein the barrier compound comprises the wax emulsion, and wherein the wax emulsion comprises a paraffin wax, an ethylene bis(stearamide) wax, a polyethylene wax, a soy-based wax, sunflower wax, carnauba wax, a fatty amine wax, or a mixture thereof. 
     
     
         18 . The process of  claim 10 , wherein the dried paper sheet is a liquid packaging board, a molded fiber product, a fast-food wrapping paper, a fast-food board, a grease proof label, or an oil proof paper sheet, and wherein the average KIT Value is at least 5. 
     
     
         19 . The process of  claim 10 , wherein the dried paper sheet has a moisture content of about 0.1 wt % to about 12 wt %, based on the weight of the dried paper sheet. 
     
     
         20 . A paper product, comprising:
 a paper substrate;   a sizing composition disposed on the paper substrate; and   a barrier compound disposed on the paper substrate, wherein:
 the sizing composition comprises one or more alkenyl succinic anhydride compounds, 
 the barrier compound comprises a fluorochemical compound, a wax emulsion, a polyolefin dispersion, a styrene acrylate emulsion, a sucrose ester, a modified starch, styrene maleic anhydride, an ethylene acrylic acid dispersion, a styrene acrylic acid, a polyvinyl alcohol, an ethylene vinyl alcohol, or a mixture thereof, and 
 the paper product has an average KIT Value of at least 3.

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