Stabilized sizing formulation

Patent metadata

Field	Value
Publication number	US-10132038-B2
Application number	US-201515116664-A
Country	US
Kind code	B2
Filing date	Feb 6, 2015
Priority date	Feb 6, 2014
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

The present invention is related to sizing agent formulations, especially to stabilizing a sizing formulation by a modified non-food polysaccharide. The method for preparation of the modified non-food polysaccharide is further provided.

First claim

The invention claimed is:

1. A stabilized sizing formulation, comprising a sizing agent and a modified non-food polysaccharide which comprises xylan or arabinogalactan or mixtures thereof and wherein the modified non-food polysaccharide is obtained by modifying a non-food polysaccharide selected from the group consisting of celluloses, hemicelluloses, gums, pectins, xylans, mannans, glucans and mucilages, with a cationically charged amino reagent and wherein the ratio of the modified non-food polysaccharide to the sizing agent is from 0.05 to 1.

2. The formulation according to claim 1 , wherein the sizing agent is alkyl ketene dimer (AKD) or alkenyl succinic anhydride (ASA) or a mixture thereof.

3. The formulation according to claim 1 , wherein the non-food polysaccharide is xylan or arabinogalactan or mixtures thereof.

4. The formulation according to claim 1 , wherein the amino reagent is glycidyltrimethylammoniumchloride.

5. The formulation according to claim 1 , wherein degree of substitution of the modified non-food polysaccharide is from 0.03 to 1.5.

6. The formulation according to claim 1 , wherein said formulation is in form of a dispersion, preferably an emulsion.

7. A method for preparing the stabilized sizing formulation of claim 1 , wherein the sizing agent and the modified non-food polysaccharide are brought into contact within an aqueous solution and a dispersion is formed by homogenization at a pressure from 140 to 160 bar.

8. A method to sizing paper and paper products comprising the steps of obtaining the stabilized sizing formulation according to claim 1 , and sizing the paper and paper products.

9. The method according to claim 8 , wherein the dosing of the stabilized sizing formulation into pulp is from 0.5 to 3 kg/t.

10. A method for preparation of the modified non-food polysaccharide of claim 1 comprising wherein said method comprises the steps of
i. providing a mixture of charging agent, water and a catalytic amount of base, and stirring said mixture thoroughly at a temperature above the room temperature, and
ii. introducing said non-food polysaccharide comprising xylan or arabinogalactan or mixtures thereof and a small amount of water to the mixture of step i, and stirring the resulting mixture for several hours at a constant temperature, and subsequently
iii. washing and filtering the resulting cationically charged non-food polysaccharide before recovery.

Assignees

• Kemira Oyj

Inventors

• Strengell Reetta
• Lindfors Juha
• Hyvärinen Sari
• Vuoti Sauli

Classifications

• D21H17/31

  Gums · CPC title

• D21H21/16 Primary

  Sizing or water-repelling agents · CPC title

• D21H17/17

  Ketenes, e.g. ketene dimers · CPC title

• D21H17/16 Primary

  Addition products thereof with hydrocarbons · CPC title

• D21H17/24 Primary

  Polysaccharides · CPC title