# US 10,246,614 B2 · Starch-based glue composition

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- Number: US 10,246,614 B2
- Document ID: US10246614B2
- Status: Granted
- Kind: B2
- Application number: 15/381,386
- Filed: 2016-12-16
- Published: 2017-09-14
- Granted: 2019-04-02
- Earliest claimed: 2010-11-15
- Assignees: Argana Staerke GmbH
- Applicants: Agrana Staerke GmbH
- Inventors: Karl-Juergen Mann; Martin Kozich; Dietmar Gruell; Marnik Michel Wastyn
- Web page: https://patentgrep.com/patent/US10246614B2

## CPC

- C09J 103/02: Starch; Degradation products thereof, e.g. dextrin
- C09J 5/00: Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J 103/00: Adhesives based on starch, amylose or amylopectin or on their derivatives or degradation products
- C08B 31/00: Preparation of derivatives of starch (derivatives of amylose C08B33/00; derivatives of amylopectin C08B35/00)
- C08L 3/04: Starch derivatives {, e.g. crosslinked derivatives}
- C09J 2403/00: Presence of starch
- Y10T 428/24802: Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T 428/24934: including paper layer
- 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)
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A highly homogeneous starch-based glue composition is obtained by enzymatic modification of the starch with a branching enzyme which is supplied in an enzymatically modified starch with high long-term stability. The starch has a viscosity stability index SI of less than or equal to 1.3, calculated by the quotient of viscosity after 14 days and by viscosity after 2 hours after preparation of the starch. The starch is suitable for liquid storage, which is stable in the long-term, of a ready-to-use paste with a high bonding strength.

## Claims

### Claim 1

A method of preparing a layered or laminated product, which comprises the steps of:
providing a glue composition having an enzymatically branched starch with a viscosity stability index SI of less than or equal to 1.3, calculated by a quotient from viscosity after 14 days and the viscosity after 2 hours after preparation of the glue composition, wherein said starch has a mean molecular weight Mw (weight average), measured by light scattering, of from 60 kDa to 3000 kDa; and
applying the glue composition as a gluing agent or a laminating agent to two surfaces of at least one of paper products, cardboard products, and displays made from paper or cardboard, wherein the glue composition bonds the two surfaces together to form a layered or laminated product.

### Claim 2 (depends on 1)

The method of claim 1, wherein said starch has a mean degree of branching of alpha-1,6 branchings of from 4 to 12%.

### Claim 3 (depends on 1)

The method of claim 1, wherein said starch has a DE value of 1 at most.

### Claim 4 (depends on 1)

The method of claim 1, wherein said starch is highly homogeneous, with a polydispersity index PDI between 1 and 5.

### Claim 5 (depends on 1)

The method of claim 1, wherein said starch is selected from the group consisting of waxy maize starch, maize starch, potato starch, amylopectin potato starch, rice starch, wheat starch, manihot starch, and sago starch.

### Claim 6 (depends on 1)

The method of claim 1, wherein a proportion of said starch makes up at least 50% of an entire starch fraction of the glue composition.

### Claim 7 (depends on 1)

The method of claim 1, wherein said starch is modified by a branching enzyme which increases a degree of branching compared to unmodified starch and/or lowers polydispersity compared to unmodified starch.

### Claim 8 (depends on 7)

The method of claim 7, wherein said starch branching enzyme is a branching enzyme of Rhodothermus sp.

### Claim 9 (depends on 7)

The method of claim 7, wherein said starch branching enzyme is selected from the group consisting of 1,4-α-D-glucan and 1,4-α-D-glucan 6-α-D-(1,4-α-D-glucano)-transferase (E.C. 2.4.1.18).

### Claim 10 (depends on 1)

The method of claim 1, wherein the glue composition is substantially free from low-molecular oligosaccharides with a degree of polymerization of less than 3.

### Claim 11 (depends on 10)

The method of claim 10, wherein a proportion of the low-molecular oligosaccharides is less than 5% by weight of a starch mass.

### Claim 12

A method for preparing a layered or laminated product, which comprises the steps of:
providing a glue composition having an enzymatically branched starch that is enzymatically branched by a branching enzyme, wherein the starch has an average molecular weight MW (weight average), measured by light scattering, of from 60 kDa to 3,000 kDa, the composition having a viscosity stability index SI of less than or equal to 1.3, calculated by a quotient from viscosity after 14 days and the viscosity after 2 hours after preparation of the glue composition;
applying the glue composition onto a first surface or layer of a product to be glued; and
applying a further surface or layer of a product to be glued onto the first surface or layer with the glue composition in between in between the two surfaces or layers.

### Claim 13 (depends on 1)

The method of claim 1, wherein the glue composition has a viscosity of at least 250 mPas at 22.5° C. and the starch content in the composition is at least 25% by weight.

### Claim 14 (depends on 1)

The method of claim 1 which comprises the additional step of pressing together the two surfaces with the glue composition.