Process for creating a foam utilizing an antimicrobial starch within a process for manufacturing a paper or board product

Patent metadata

Field	Value
Publication number	US-11001969-B2
Application number	US-201716316790-A
Country	US
Kind code	B2
Filing date	Jul 3, 2017
Priority date	Jul 11, 2016
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

The present invention relates to a new process for creating foam in a process for manufacturing a paper or board product. According to the present invention, certain types of antimicrobial starch is used in the creation of the foam.

First claim

The invention claimed is:

1. A process for manufacturing a paper or board product, comprising the steps of
a) providing an antimicrobial starch as a foam forming aid, wherein said starch has at least 1% by weight of a grafted polymer, said grafted polymer being an amino-containing polymer which has antimicrobial activity against E. coli and S. aureus of a minimum inhibitory concentration of 50 ppm or less;
b) mixing the antimicrobial starch with water in the presence of air in an aqueous phase to obtain a foamed suspension; and,
c) manufacturing a paper or board product with the foamed suspension obtained in step b)
wherein an amount of antimicrobial starch in the foamed suspension is between 0.05 and 500 kg/ton of the paper or board product, and,
wherein an amount of any additional foaming aid in the foamed suspension is less than 0.02 g/L.

2. The process according to claim 1 , wherein the amino-containing polymer of the antimicrobial starch is a guanidine-based polymer.

3. The process according to claim 2 , wherein the guanidine-based polymer is polyhexamethylene guanidine hydrochloride.

4. The process according to claim 1 , wherein the foam is created in the absence of any additional foaming aid.

5. The process according to claim 1 , wherein the foam is created in the presence of a foam stabilizer.

6. The process according to claim 1 , comprising the addition of microfibrillated cellulose in the creation of the foam.

7. The process according to claim 1 , wherein at least step b) is carried out in a wet end of a process for manufacturing a paper or board product.

8. The process according to claim 1 , wherein the amount of antimicrobial starch in the foamed suspension is between 1 and 25 kg/ton of the paper or board product.

Assignees

• Stora Enso Oyj

Inventors

• Backfolk Kaj
• Heiskanen Isto
• Saukkonen Esa
• Partti-Pellinen Kirsi
• Siitonen Simo

Classifications

• D21H21/56 Primary

  Foam · CPC title

• D21H17/28

  Starch · CPC title

• D21H19/00

  Coated paper (coated fibreboard D21J1/08); Coating material (recording sheets characterised by the coating used to improve ink, dye or pigment receptivity B41M5/50) · CPC title

• D21F11/002 Primary

  by using a foamed suspension · CPC title

• D21H21/36

  Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents · CPC title