Method for the chemical treatment of starch for applying in sheets of paper

• US 8,840,760 B2
• Filed: 10/02/2009
• Issued: 09/23/2014
• Est. Priority Date: 10/02/2009
• Status: Active Grant

• Current Assignee: Oriol Gracia Grandia
• Original Assignee: Oriol Gracia Grandia
• Inventors: Gracia Grandia, Oriol
• Primary Examiner(s): CORDRAY, DENNIS R
• Application Number:
  US13/380,581
• Publication Number:
  US 20120101195A1
• Time in Patent Office: 1,817 Days
• Field of Search: 162/123, 162/124, 162/135, 162/158, 1621681-1683, 162/175, 162/184, 1621811-1813, 106/162.1, 106/206.1, 106/214.1, 106/215.1, 106/217.1, 106/217.01, 524/47, 524/52, 127/2, 127/9, 127/23, 127/67, 127 69- 71
• US Class Current: 162/168.3
• CPC Class Codes: C08L 3/02 Starch; Degradation products thereof, e.g. dextrin
• CPC Class Codes: D21H 19/54 Starch
• CPC Class Codes: D21H 19/64 Inorganic compounds
• CPC Class Codes: D21H 23/50 Spraying or projecting D21H23/44, D21H23/66 take precedence

Abstract

The object of the process of the invention is to increase the retention of starch in the sheet of paper in order to reduce operating costs and increase the physical characteristics of the paper. To that end, it has been envisaged that trivalent cationic salts are added, metered into the slurry or in the process for obtaining starch in powder form or by mixing a percentage of trivalent salts in powder form with the starch in powder form, seeking the solution of said salts in the slurry, so that they dissolve during the dispersion of the slurry in the process for obtaining the sheet of paper. Organic polymers such as polyacrylamides, polyvinylamides and polydadmacs could optionally be applied in addition to said salts.

Claims

1. A method for the chemical treatment of starch for its application on sheets of paper, characterized by comprising the following steps:

mixing the starch with an additive comprising between 0.1% and 50% of trivalent cationic salts,

wherein the trivalent cationic salts comprise between 0.05% and 10% of FeCl₃ or Fe₂(SO₄)₃; and

spraying on the sheet of paper a slurry containing the starch and the additive.

2. The method according to claim 1, wherein the additive further comprises between 0.1% and 50% of organic polymers.

3. The method according to claim 1, wherein the organic polymers comprise polyacrylamide, polyvinylamide, polyamine and/or polydadmac.

4. The method according to claim 3, where the organic polymers comprise between 0.5% and 20% of polyacrylamide.

5. The method according to claim 3, where the organic polymers comprise between 0.1% and 30% of polyvinylamide, polydadmac and/or polyamine.