US-12617983-B2 - Starch-based aqueous adhesive composition

Abstract

The present invention relates to an aqueous adhesive composition comprising: —a) an amylomaltase-treated starch or an amylomaltase-treated maltodextrin; and —b) ammonium zirconium carbonate.

Inventors

• Frank BÜTERÖWE

Assignees

• BOSTIK SA

Dates

Publication Date

20260505

Application Date

20211011

Priority Date

20201012

Claims (14)

1. 1 . Aqueous adhesive composition comprising: a) from 20% to 60% by weight of an amylomaltase-treated starch or an amylomaltase-treated maltodextrin, compared to a total weight of the aqueous adhesive composition, wherein the amylomaltase-treated starch is obtained from native starch comprising from 15% to 30% by weight of amylose and from 70% to 85% by weight of amylopectin, the weight percent being based on the total weight of the native starch; and b) ammonium zirconium carbonate.
2. 2 . Aqueous adhesive composition according to claim 1 , wherein the native starch is selected from the group consisting of potato starch, wheat starch, maize starch, rice starch, peas starch, tapioca starch, wrinkled pea starch, mung bean starch, and mixtures thereof.
3. 3 . Aqueous adhesive composition according to claim 1 , wherein the native starch is potato starch.
4. 4 . Aqueous adhesive composition according to claim 1 , comprising more than 40% by weight of water, compared to the total weight of said aqueous composition.
5. 5 . Aqueous adhesive composition according to claim 1 , comprising from 0.10% to 1.0% by weight, of ammonium zirconium carbonate (dry matter) compared to the total weight of the aqueous adhesive composition.
6. 6 . Aqueous adhesive composition according to claim 1 , comprising at least one additive selected from the group consisting of biocide, defoamer, plasticizer, rheology modifier, coloring agent, wetting agent, pH regulator, inorganic filler, and mixtures thereof.
7. 7 . Aqueous adhesive composition according to claim 1 , characterized in that it is free of boron compounds.
8. 8 . Aqueous adhesive composition comprising: a) from 20% to 60% by weight of an amylomaltase-treated starch or an amylomaltase-treated maltodextrin, compared to a total weight of the aqueous adhesive composition; and b) ammonium zirconium carbonate, wherein the amylomaltase-treated maltodextrin is obtained from low DE maltodextrin having a Dextrose Equivalent (DE) lower than 10 (0 <DE <10).
9. 9 . Aqueous adhesive composition according to claim 8 , wherein the low DE maltodextrin has a dextrose equivalent lower than 5 (0 <DE <5).
10. 10 . Aqueous adhesive composition comprising: a) from 20% to 60% by weight of an amylomaltase-treated starch or an amylomaltase-treated maltodextrin, compared to a total weight of the aqueous adhesive composition; and b) ammonium zirconium carbonate, wherein the aqueous adhesive composition has a viscosity ranging from 100 mPa.s. to 5,000 mPa.s at 23° C.
11. 11 . Aqueous adhesive composition according to claim 10 , having a pH ranging from 7 to 10.
12. 12 . Rigid packaging or tubes comprising the aqueous adhesive composition according to claim 10 .
13. 13 . A method of manufacturing a rigid cylindrical core comprising winding a paper or paperboard material onto a cylindrical mandrel at a given wind angle, wherein the material is wound such that each winding at least partially overlaps a previous winding, applying the aqueous adhesive composition according to claim 10 to a seam or an overlapping portion of the material such that the paperboard or paper material adheres to itself at the seam or overlapping portion thereby creating a rigid cylindrical core.
14. 14 . The method of claim 13 , wherein the rigid cylindrical core comprises a paper towel core, a toilet paper core, or a core for protection of alcohol bottle.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a U.S. National Stage application of International Patent Application No. PCT/EP2021/078003, filed on Oct. 11, 2021, which claims the benefit of European Patent Application No. 20306198.1, filed on Oct. 12, 2020. The present invention relates to starch-based aqueous adhesive composition. The present invention also relates to the uses of the starch-based aqueous composition for the manufacture of tubes/cores. BACKGROUND Homopolymeric polyvinyl acetate (PVAc) dispersions are widely used and have been established for many years in the industrial bonding of paper, wood or paperboard, for example in the field of rigid packaging or fabrication of cores/tubes. Paperboard or paper cores are hollow tubes made of one or several layers of paperboard or paper. These cores are formed by winding a material such as paper or paperboard, onto a cylindrical mandrel at a given wind angle, the material being wound such that each winding at least partially overlaps the previous winding and is adhered to itself at the seam or overlap to create a cylindrical core. Such cores are commonly used for rolled products where the rolled products are wound around the cores. Mention can be made of cores for paper towel, for toilet paper, or for protecting alcohol bottle. These cores/tubes are typically manufactured with industrial continuous processes, in particular by core-winding processes. In order to meet the constraints of the high-speed continuous processes used in the industry, the water-based adhesive compositions are expected to have a fast setting time, in other terms to have the ability, immediately after their application and formation of a two substrates assembly, to set a bond rapidly and to maintain this bond after a short application of pressure. The PVAc dispersions typically allow reaching fast setting times. However, there exists a need for more environmentally dispersions. Such alternatives exist which are aqueous solutions of dextrin or starch. However, these solutions do not allow obtaining fast setting times, and thus leads to poorer productivity of the industrial processes. Thus there exists a need for new environmentally adhesive compositions which exhibits fast setting times. In particular, there exists a need for new environmentally adhesive compositions which provide a good compromise between adhesive properties and fast setting times, notably for the assembling of paper or paperboard substrates. DESCRIPTION OF THE INVENTION The present invention concerns an aqueous adhesive composition comprising: a) an amylomaltase-treated starch or an amylomaltase-treated maltodextrin; andb) ammonium zirconium carbonate (AZC). The amylomaltase-treated starch may be obtained from native starch comprising from 15% to 30% by weight of amylose and from 70 to 85% by weight of amylopectin, the weight percent being based on the total weight of the native starch. The content of amylose may be determined by the “blue value” method described in Batey Ian et al., “Measurement of amylose/amylopectin ratio by high performance liquid chromatography”, volume 48, n° 9, p. 338-344, 1996. Maltodextrins are known to be enzymatic derivatives of native starchs. Enzymatic processes for obtaining maltodextrins from native starchs are well known by the skilled person. Maltodextrin are typically classified by “Dextrose Equivalent” (called DE) which gives an indication of the average degree of polymerization for starch sugars. Typically, maltodextrins have a Dextrose Equivalent as follows: 0<DE (maltodextrins)<20 while native starchs have a Dextrose Equivalent of zero. The Dextrose Equivalent may be measured according to the norm NF EN ISO 5377 (1994). The amylomaltase-treated maltodextrin may be obtained from a low DE maltodextrin having a Dextrose Equivalent (DE) lower than 10 (0<DE<10), and more preferably lower than 5 (0<DE<5). The low DE maltodextrin having a Dextrose Equivalent (DE) lower than 10, more preferably lower than 5, may be derived from native starch, preferably from waxy native starch containing more than 95% by weight of amylopectin, the weight percent based on the total weight of the native starch. The native starch may be selected from the group consisting of potato starch, wheat starch, maize starch, rice starch, peas starch, tapioca starch, wrinkled pea starch, mung bean starch, and mixtures thereof. Preferably, the native starch is potato starch. The low DE maltodextrin having a Dextrose Equivalent (DE) lower than 10 (0<DE<10), and more preferably lower than 5 (0<DE<5), may be obtained after treatment of native starch selected from the group of waxy starches, such as potato starch or waxy corn, after treatment with amylolytic enzymes such as amylases. The aqueous adhesive composition may comprise from 20% to 60%, preferably from 25% to 55%, and even more preferably from 30% to 50% by weight (expressed as dry content) of the amylomaltase-treated starch or the amylomalt