Paper-making aid composition and process for increasing ash retention of finished paper

Patent metadata

Field	Value
Publication number	US-9873986-B2
Application number	US-201415021490-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Sep 12, 2013
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A paper-making aid composition comprising dialdehyde-modified polyacrylamide-type strengthening agent, polyacrylamide-type strengthening agent and water and having a pH value of 6 or more is provided. A method of paper-making by using the paper-making aid composition is also provided.

First claim

The invention claimed is:

1. A paper-making aid composition comprising dialdehyde-modified polyacrylamide-type strengthening agent, polyacrylamide-type strengthening agent and water;
the dialdehyde-modified polyacrylamide-type strengthening agent is selected from cationic dialdehyde-modified polyacrylamide-type strengthening agent, anionic dialdehyde-modified polyacrylamide-type strengthening agent and amphoteric dialdehyde-modified polyacrylamide-type strengthening agent;
the polyaerylamide-type strengthening agent is selected from cationic polyacrylamide-type strengthening agent, anionic polyacrylamide-type strengthening agent and amphoteric polyacrylamide-type strengthening agent;
wherein the paper-making aid composition has a pH value of 6 or above;
and the following are excluded:
(A) all of the dialdehyde-modified polyacrylamide-type strengthening agent is cationic dialdehyde-modified polyacrylamide-type strengthening agent, and all of the polyacrylamide-type strengthening agent is cationic polyacrylamide type strengthening agent, and
(B) all of the dialdehyde-modified polyacrylamide-type strengthening agent is anionic dialdehyde-modified polyacrylamide-type strengthening agent, and all of the polyacrylamide-type strengthening agent is anionic polyacrylamide-type strengthening agents.

2. The paper-making aid composition of claim 1 , wherein:
the cationic dialdehyde-modified polyacrylamide-type strengthening agent is dialdehyde-modified copolymer comprising acrylamide monomer and cationic monomer;
the anionic dialdehyde-modified polyacrylamide-type strengthening agent is dialdehyde-modified copolymer comprising acrylamide monomer and anionic monomer;
the amphoteric dialdehyde-modified polyacrylamide-type strengthening agent is dialdehyde-modified copolymer comprising acrylamide monomer, cationic monomer and anionic monomer.

3. The paper-making aid composition of claim 2 , wherein the dialdehyde is selected from glyoxal, malonaldehyde, succinic aldehyde, glutaraldehyde, and combinations thereof.

4. The paper-making aid composition of claim 3 , wherein the dialdehyde of any one of the dialdehyde-modified copolymers is glyoxal.

5. The paper-making aid composition of claim 2 , wherein the cationic monomer of the dialdehyde-modified polyacrylamide-type strengthening agent is selected from diallyldimethylammonium chloride, N-(3-dimethylaminopropyl)methacrylamide, N-(3-dimethylaminopropyl) acrylamide, trimethyl-2-methacroyloxyethylammonium chloride, trimethyl-2-acroyloxyethyl ammonium chloride, methylacryloxyethyldimethyl benzyl ammounium chloride, acryloxyethyldimethyl benzyl ammounium chloride, (3-acrylamidopropyl)trimethyl ammonium chloride, (3-methacrylamidopropyl)trimethylammonium chloride, (3-acrylamido-3-methylbutyl)trimethylammonium chloride, 2-vinylpyridine, 2-(dimethylamino)ethyl methacrylate, 2-(dimethylamino)ethyl acrylate, and combinations thereof.

6. The paper-making aid composition of claim 2 , wherein the anionic monomer is selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, salts thereof, and combinations thereof.

7. The paper-making aid composition of claim 2 , wherein the acrylamide monomer is at least one of acrylamide and methacrylamide.

8. The paper-making aid composition of claim 1 , wherein the dialdehyde-modified polyacrylamide-type strengthening agent has a weight average molecular weight of 100,000-40,000,000 Dalton.

9. The paper-making aid composition of claim 1 , wherein
the cationic polyacrylamide-type strengthening agent is a copolymer comprising acrylamide monomer and cationic monomer;
the anionic polyacrylamide-type strengthening agent is a copolymer comprising acrylamide monomer and anionic monomer;
the amphoteric polyacrylamide-type strengthening agent is a copolymer comprising acrylamide monomer, cationic monomer and anionic monomer.

10. The paper-making aid composition of claim 9 , wherein the cationic monomer is selected from diallyldimethylammonium chloride, N-(3-dimethylaminopropyl)methacrylamide, N-(3-dimethylaminopropyl) acrylamide, trimethyl-2 methacroyloxyethylammonium chloride, trimethyl-2-acroyloxyethyl ammonium chloride, methylacryloxyethyldimethyl benzyl ammounium chloride, acryloxyethyldimethyl benzyl ammounium chloride, (3-acrylamidopropyl)trimethyl ammonium chloride, (3-methacrylamidopropyl)trimethylammonium chloride, (3-acrylamido-3-methylbutyl)trimethylammonium chloride, 2-vinylpyridine, 2-(dimethylamino)ethyl methacrylate, 2-(dimethylamino)ethyl acrylate, and combinations thereof.

11. The paper-making aid composition of claim 9 , wherein the anionic monomer is selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, salts thereof, and combinations thereof.

12. The paper-making aid composition of claim 1 , wherein the polyacrylamide-type strengthening agent has a weight average molecular weight of 100,000-10,000,000 Dalton.

13. The paper-making aid composition of claim 1 , wherein the total solid content of the polyacrylamide-type strengthening agent in the paper-making aid composition is from 0.1 to 60 wt %.

14. The paper-making aid composition of claim 1 , wherein the ratio of the solid content of the dialdehyde-modified polyacrylamide-type strengthening agent to the solid content of the polyacrylamide-type strengthening agent is from 1:99 to 99:1.

15. The paper-making aid composition of claim 1 , wherein the paper-making aid composition has a pH of from about 8 to about 10.

16. The paper-making aid composition of claim 1 , wherein the paper-making aid composition has a pH of from about 6.5 to about 13.

17. The paper-making aid composition of claim 1 , wherein the paper-making aid composition has a pH of from about 7 to about 12.

18. The paper-making aid composition of claim 1 , wherein the paper-Making aid composition has a of from about 7.5 to about 11.

19. The paper-making aid composition of claim 1 , wherein the paper making aid composition has a molar ratio of cationic monomers to anionic monomers of from 1:100 to 100:1.

20. The papermaking aid composition of claim 19 , wherein the molar ratio of cationic monomers to anionic monomers is from 1:10 to 10:1.

Assignees

• Ecolab Usa Inc

Inventors

• Zhu Bo
• Xu Na
• Zhang Meng
• Zhao Yulin

Classifications

• D21H21/18 Primary

  Reinforcing agents · CPC title

• D21H17/375

  Poly(meth)acrylamide · CPC title