US2023313467A1PendingUtilityA1

Strength improvement via sprayboom application

54
Assignee: ECOLAB USA INCPriority: Jul 7, 2020Filed: Jul 7, 2021Published: Oct 5, 2023
Est. expiryJul 7, 2040(~13.9 yrs left)· nominal 20-yr term from priority
Inventors:David JordanHeqing HuangWeiguo ChengMingli WeiMei LiuWilliam Granger
D21H 21/18D21H 17/42D21H 17/44D21H 23/28D21H 23/50D21H 27/30D21H 17/375D21H 27/32
54
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

The present disclosure provides methods and compositions for strengthening paper. The methods may include a step of spraying an anionic polymer onto a paper sheet to increase the strength of the paper sheet. The anionic polymer may have amino groups, amide groups, or a combination of amino groups and amide groups. These groups may be functionalized with an aldehyde. Methods may also include a step of adding a wet end composition to a wet end of the papermaking process.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A method for enhancing the strength of a paper sheet, comprising:
 adding an effective amount of a wet end composition to a furnish comprising a pulp in a wet end of a papermaking process, wherein the wet end composition comprises a cationic polymer or an amphoteric polymer with a net positive charge,   forming a paper sheet from the pulp, and   spraying an effective amount of a composition onto the paper sheet, the composition comprising an anionic polymer comprising amino groups, amide groups, or a combination thereof, wherein at least a portion of the amino groups and/or the amide groups are functionalized with an aldehyde.   
     
     
         2 . The method of  claim 1 , wherein the composition is sprayed onto the sheet prior to a press section. 
     
     
         3 . The method of  claim 1 , wherein the effective amount of the composition and/or the wet end composition is from about 0.05 lb/ton to about 20 lb/ton, based on dry fiber. 
     
     
         4 . The method of  claim 1 , wherein the portion comprises from about 10 mole percent to at least about 50 mole percent. 
     
     
         5 . The method of  claim 1 , wherein the amino groups, the amide groups, or the combination of amino groups and amide groups are mono-reacted and di-reacted with the aldehyde at a ratio of mono-reacted to di-reacted of from about 1.1:1 to about 50:1. 
     
     
         6 . The method of  claim 1 , wherein the anionic polymer comprises a monomer selected from the group consisting of acrylamide, methacrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, N-isopropylacrylamide, N-vinylformamide, N-vinylmethylacetamide, N-vinyl pyrrolidone, hydroxyethyl methacrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, N-tert-butylacrylamide, N-methylolacrylamide, allylamine, diallylamine, and any combination thereof. 
     
     
         7 . The method of  claim 1 , wherein the anionic polymer is glyoxalated polyacrylamide. 
     
     
         8 . The method of  claim 1 , wherein the cationic polymer or the amphoteric polymer with the net positive charge comprises acrylamide and a monomer selected from the group consisting of 2-(acryloyloxy)-N,N,N-trimethylethanaminium chloride, diallylamine, diallyldimethylammonium chloride, and any combination thereof. 
     
     
         9 . The method of  claim 1 ,wherein the wet end composition comprises hydrolyzed poly(N-vinylformamide) and/or cationic starch. 
     
     
         10 . A method for enhancing the strength of a paper sheet, comprising:
 spraying an effective amount of a composition onto the paper sheet, the composition comprising water and an anionic polymer comprising amino groups, amide groups, or a combination thereof, wherein at least a portion of the amino groups and/or the amide groups are functionalized with an aldehyde, wherein the paper sheet comprises a top ply, a bottom ply, and a filler ply disposed between the top ply and the bottom ply.   
     
     
         11 . The method of  claim 10 , wherein the composition is sprayed to a location selected from the group consisting of a top side of the top ply, a bottom side of the top ply, a top side of the filler ply, a bottom side of the filler ply, a top side of the bottom ply, a bottom side of the bottom ply, and any combination thereof. 
     
     
         12 . The method of  claim 10 , wherein the composition is sprayed to a location selected from the group consisting of a top side of the top ply, a top side of the filler ply, a bottom side of the filler ply, a top side of the bottom ply, a bottom side of the bottom ply, and any combination thereof. 
     
     
         13 - 14 . (canceled) 
     
     
         15 . The method of  claim 10 , wherein the amino groups, the amide groups, or the combination of amino groups and amide groups are mono-reacted and di-reacted with the aldehyde at a ratio of mono-reacted to di-reacted of from about 1.1:1 to about 50:1. 
     
     
         16 . The method of  claim 10 , wherein the composition is sprayed onto the paper sheet prior to a press section. 
     
     
         17 - 19 . (canceled) 
     
     
         20 . A method for enhancing the strength of a paper sheet, comprising:
 spraying an effective amount of a composition onto the paper sheet, the composition comprising water and an anionic polymer comprising amino groups, amide groups, or a combination thereof, wherein at least a portion of the amino groups and/or the amide groups are functionalized with an aldehyde, wherein the paper sheet comprises a top ply and a bottom ply, wherein the composition is sprayed at a location selected from the group consisting of a top side of the top ply, a top side of the bottom ply, a bottom side of the bottom ply, and any combination thereof.   
     
     
         21 . The method of  claim 20 , wherein a filler ply is disposed between the top ply and the bottom ply. 
     
     
         22 . The method of  claim 20 , wherein the effective amount is from about 0.05 lb/ton to about 20 lb/ton, based on dry fiber. 
     
     
         23 . The method of  claim 20 , wherein the portion comprises from about 10 mole percent to at least about 50 mole percent. 
     
     
         24 . The method of  claim 20 , wherein the amino groups, the amide groups, or the combination of amino groups and amide groups are mono-reacted and di-reacted with the aldehyde at a ratio of mono-reacted to di-reacted of from about 1.1:1 to about 50:1. 
     
     
         25 . The method of  claim 20 , wherein the composition is sprayed onto the paper sheet prior to a press section. 
     
     
         26 - 29 . (canceled)

Join the waitlist — get patent alerts

Track US2023313467A1 — get alerts on status changes and closely related new filings.

We store only your email — no account needed. See our privacy policy.