Paper strength improving additives, their manufacture and use in paper making

Patent metadata

Field	Value
Publication number	US-11802376-B2
Application number	US-201817055145-A
Country	US
Kind code	B2
Filing date	May 14, 2018
Priority date	May 14, 2018
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

The present invention relates to a polymer composition comprising an anionic polymer composite having a synthesized polymer portion and a polysaccharide portion, obtainable by polymerizing vinyl monomers in the presence of the polysaccharide. The present invention further relates to a strength system and methods of production and use in providing a paper product.

First claim

The invention claimed is:

1. A polymer composition comprising an anionic polymer composite having a synthesized polymer portion and an anionic polysaccharide portion, obtainable by polymerizing vinyl monomers in the presence of an anionic polysaccharide, wherein said anionic polymer composite has a weight ratio of the anionic polysaccharide portion to the synthesized polymer portion in the range of 0.1:10-5:1 (dry/dry).

2. The polymer composition according to claim 1 , having a solids content originating from the anionic polymer composite of about 1-50 wt %, based on the total weight of the polymer composition.

3. The polymer composition according to claim 1 , wherein the anionic polymer composite has a Brookfield viscosity of about 3-1200 mPas, when measured from an aqueous solution of the polymer composition having solids content of 2 weight-% using a Brookfield LVT viscometer with a #2 spindle at 60 rpm at pH 7, 23° C.

4. The polymer composition according to claim 1 , wherein said vinyl monomers providing nonionic units to the synthesized polymer portion of the composite are selected from the group consisting of acrylamide-based monomers, acrylate-based monomers, N-vinylcarbamides, styrene, acrylonitrile, vinyl acetate, N-vinylpyrrolidone, N-vinyl-2-caprolactam, maleic anhydride, vinylethers, and combinations thereof.

5. The polymer composition according to claim 1 , wherein said vinyl monomers providing anionic units to the synthesized polymer portion of the composite are selected from the group consisting of monomers containing a carboxylic acid functional group, a sulfonic acid functional group, a phosphonic acid functional group, their corresponding water soluble or dispersible salts, and combinations thereof.

6. The polymer composition according to claim 1 , wherein said anionic polysaccharide is selected from the group consisting of anionic cellulose-based polysaccharides, anionic alginate-based polysaccharides, anionic guar-based polysaccharides, anionic starch-based polysaccharides, and combinations thereof.

7. The polymer composition of claim 1 , wherein the anionic cellulose-based polysaccharides are selected from the group consisting of carboxymethylcellulose (CMC), carboxymethylhydroxyethylcellulose (CMHEC), carboxymethyl methyl cellulose (CMMC), and combinations thereof; or the anionic cellulose-based polysaccharides are selected from the group consisting of anionic cellulose-based polysaccharides consisting essentially of carboxymethylcellulose (CMC).

8. The polymer composition according to claim 1 , wherein the vinyl monomers providing anionic units to the synthesized polymer portion of the composite are selected from the group consisting of:
(i) acrylamide based monomers;
(ii) acrylic acid, methacrylic acid, maleic acid, itaconic acid, vinyl sulfonic acid, 2-acrylamido-2-methylpropane sulfonic acid (AMPS), acrylamido methane sulfonic acid, acrylamido ethane sulfonic acid, 2-hydroxy-3-acrylamide propane sulfonic acid, styrene sulfonic acid, vinyl phosphonic acid, their corresponding water soluble or dispersible alkali metal, alkaline earth metal, or ammonium salts, and combinations thereof; or
(iii) acrylic acid, its water soluble or dispersible alkali metal, alkaline earth metal, or ammonium salts, and combinations thereof.

9. The polymer composition according to claim 1 , having a solids content originating from the anionic polymer composite of about 10-30 wt %, based on the total weight of the polymer composition.

10. The polymer composition according to claim 1 , wherein the anionic polymer composite has a Brookfield viscosity of about 12-150 mPas, when measured from an aqueous solution of the polymer composition having solids content of 2 weight-% using a Brookfield LVT viscometer with a #2 spindle at 60 rpm at pH 7, 23° C.

11. The polymer composition according to claim 1 , wherein the anionic polymer composite has a weight ratio of the anionic polysaccharide portion to the synthesized polymer portion in the range of 0.5:10-3:1 (dry/dry).

12. The polymer composition according to claim 1 , wherein the anionic polymer composite has a weight ratio of the anionic polysaccharide portion to the synthesized polymer portion in the range of 1:10-1:1 (dry/dry).

Assignees

• Kemira Oyj

Inventors

• Lu Chen
• Rabideau Jenna

Classifications

• D21H17/30 Primary

  Alginic acid or alginates · CPC title

• C08B31/003

  Crosslinking of starch · CPC title

• C08B37/0084

  Guluromannuronans, e.g. alginic acid, i.e. D-mannuronic acid and D-guluronic acid units linked with alternating alpha- and beta-1,4-glycosidic bonds; Derivatives thereof, e.g. alginates · CPC title

• C08L1/08

  Cellulose derivatives · CPC title

• C08L3/04

  Starch derivatives {, e.g. crosslinked derivatives} · CPC title