Modified vinylamine-containing polymers and their use in papermaking

Patent metadata

Field	Value
Publication number	US-9783933-B2
Application number	US-201615154238-A
Country	US
Kind code	B2
Filing date	May 13, 2016
Priority date	Apr 10, 2015
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

Provided is a method of making paper and paperboard. In particular graft copolymers of vinyl monomers and functionalized vinylamine-containing base polymers by Michael addition are added to a paper furnish. The composition can be used alone or in combination with other additives for use in paper making and to improve paper making processes such as paper dry and wet strength properties.

First claim

What is claimed:

1. A method of improving wet and dry strength of a paper or paperboard comprising:
adding a graft copolymer composition of a vinyl monomer and a functionalized vinylamine-containing base polymer to a paper or paperboard furnish, wherein the functionalized vinylamine-containing base polymer comprises randomly distributed repeating monomer units having the formula (I), (II) and (III),

wherein R is a reacted α, β-unsaturated alkyl carbonyl compound through Michael addition by vinylamine in the polymer; n, p and q are the numbers indicating mole % of the repeating units of formula (I), (II) and (III) present in the functionalized vinylamine-containing polymer; and
wherein n is from about 5 mole % to about 98 mole %, p is from about 1 mole % to about 80 mole %, q is from about 1 mole % to about 30 mole % the mole ratio of the functionalized vinylamine-containing base polymer to the vinyl monomer in the graft polymer is in the range of from about 10:90 to about 50:50; and
forming the paper or paperboard.

2. The method according to claim 1 , wherein the composition can be used in combination with one or more additives is selected from the group consisting of cationic, anionic, amphoteric, nonionic synthetic and natural polymers.

3. The method according to claim 2 , wherein the anionic polymer is selected from the group consisting of a copolymer containing acrylic acid, a copolymer of acrylamide and acrylic acid, and a carboxyl methyl cellulose.

4. The method according to claim 2 , wherein the cationic polymer is selected from the group consisting of crosslinked polyamidoamines, polydiallyldimethylammonium chlorides, and polyamines.

5. The method according to claim 2 , wherein the one or more additives is selected from the group consisting of polymeric aldehyde-functional compounds.

6. The method according to claim 5 , wherein the polymeric aldehyde-functional compound is selected from the group consisting of glyoxalated polyacrylamides, aldehyde celluloses and aldehyde functional polysaccharides.

7. The method according to claim 2 , wherein the one or more additives can be an aqueous dispersion of a cationic amide-containing polymer.

8. The method according to claim 7 , wherein the ratio of the active cationic amide-containing polymer to the vinylamine-containing graft copolymer is from about 2:98 to about 40:60.

9. The method according to claim 2 , wherein the one or more additives is a cationic starch, an amphoteric starch or a combination thereof.

10. The method according to claim 2 , wherein the ply bond strength of the paper is improved.

Assignees

• Solenis Tech Lp

Inventors

• Borkar Sachin
• Gu Qu-Ming
• Mahoney Joseph M
• Lusvardi Kate Marritt
• Luo Mingxiang
• Riehle Richard

Classifications

• C08F226/02

  by a single or double bond to nitrogen · CPC title

• D21H17/41

  containing ionic groups · CPC title

• C08F8/00

  Chemical modification by after-treatment (graft polymers, block polymers, crosslinking with unsaturated monomers or with polymers C08F251/00 - C08F299/00; of conjugated diene rubbers C08C) · CPC title

• D21H21/20 Primary

  Wet strength agents · CPC title

• C08F8/44

  Preparation of metal salts or ammonium salts · CPC title