Partially soluble dextrins of high molecular weight

Patent metadata

Field	Value
Publication number	US-10370553-B2
Application number	US-201214358735-A
Country	US
Kind code	B2
Filing date	Nov 16, 2012
Priority date	Nov 18, 2011
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

A modified starch, exhibits: a weight-average molecular weight ranging from 250 000 to 2 000 000 Da; a solubility, measured according to a test A, ranging from 50 to 85%. A process for the manufacture of the starch and a process to the use thereof in the manufacture of an aqueous binder are also described.

First claim

The invention claimed is:

1. A dextrinized starch having:
a weight-average molecular weight ranging from 380,000 to 1,400,000 Da;
a polydispersity greater than 15;
a solubility, measured according to a test A, ranging from 50 to 85%; and
a total weight of said molecules of said dextrinized starch comprising:
a mass fraction of between 5 and 25% of said molecules with a molecular weight of greater than 1,000,000 Da,
a mass fraction of between 25 and 50% of said molecules with a molecular weight of greater than 100,000 Da and less than or equal to 1,000,000 Da,
a mass fraction of between 30 and 50% of said molecules with a molecular weight of greater than 10,000 Da and less than or equal to 100,000 Da, and
a mass fraction of less than 20% of said molecules with a molecular weight of less than or equal to 10,000 Da.

2. The dextrinized starch according to claim 1 , exhibiting a solubility, measured according to test A, ranging from 55 to 65%.

3. The dextrinized starch according to claim 1 , exhibiting a solubility, measured according to test A, ranging from 65 to 80%.

4. A process for obtaining the dextrinized starch according to claim 1 , which comprises:
introducing at least one granular starch, as a feed, into a turboreactor;
introducing, into said turboreactor, between 0.003 and 0.020 mol of an acid per kg of feed, wherein said acid is at least one acidic agent chosen from strong acids having a pKa of less than −1.7;
modifying said feed with said acid in said turboreactor at a temperature of between 160 and 215° C. and a duration of between 1 and 10 minutes to obtain dextrinized starch;
recovering the dextrinized starch from the turboreactor,
wherein a moisture content of said feed during at least part of said acid modification is between 1 and 3%.

5. The process according to claim 4 , wherein the amount of acid introduced is between 0.006 and 0.015 mol per kg of dry granular starch.

6. The process according to claim 4 , wherein the amount of acid introduced is between 0.008 and 0.012 mol per kg of dry granular starch.

7. The process according to claim 4 , wherein the at least one acidic agent is selected from the group consisting of methanesulphonic acid, hydrochloric acid and sulphuric acid.

8. The process according to claim 4 , wherein the at least one granular starch and at least one acidic agent are introduced simultaneously.

9. A method of manufacturing an aqueous binder, which comprises mixing the dextrin according to claim 1 , in water at room temperature to obtain said aqueous binder.

Assignees

• Roquette Freres

Inventors

• Mesnager Julien
• Wiatz Vincent

Classifications

• Y10T428/31993

  Of paper · CPC title

• D21H19/54

  Starch · CPC title

• D21H17/28

  Starch · CPC title

• C09J103/02

  Starch; Degradation products thereof, e.g. dextrin · CPC title

• C09D103/02 Primary

  Starch; Degradation products thereof, e.g. dextrin · CPC title