# US 10,370,553 B2 · Partially soluble dextrins of high molecular weight

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- Number: US 10,370,553 B2
- Document ID: US10370553B2
- Status: Granted
- Kind: B2
- Application number: 14/358,735
- Filed: 2012-11-16
- Published: 2014-11-06
- Granted: 2019-08-06
- Earliest claimed: 2011-11-18
- Assignees: Roquette Freres
- Applicants: Roquette Freres
- Inventors: Julien Mesnager; Vincent Wiatz
- Web page: https://patentgrep.com/patent/US10370553B2

## CPC

- C09D 103/02: Starch; Degradation products thereof, e.g. dextrin
- C08B 30/14: Cold water dispersible or pregelatinised starch
- C08B 30/18: Dextrin {, e.g. yellow canari, white dextrin, amylodextrin or maltodextrin; Methods of depolymerisation, e.g. by irradiation or mechanically}
- C08L 3/02: Starch; Degradation products thereof, e.g. dextrin
- C09J 103/02: Starch; Degradation products thereof, e.g. dextrin
- D21H 17/28: Starch
- D21H 19/54: Starch
- Y10T 428/31993: Of paper
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08B: POLYSACCHARIDES; DERIVATIVES THEREOF (polysaccharides containing less than six saccharide radicals attached to each other by glycosidic linkages C07H; fermentation or enzyme-using processes C12P19/00; sugar industry C13; production of cellulose D21)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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%.

### Claim 5 (depends on 4)

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.

### Claim 6 (depends on 4)

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.

### Claim 7 (depends on 4)

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.

### Claim 8 (depends on 4)

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

### Claim 9 (depends on 1)

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.