Aqueous adhesive compositions stabilized against microbial infestation
Aqueous adhesive compositions with guanidine and a pH range of 7.5 to 12.0 effectively resist microbial infestation, addressing contamination issues and legal restrictions, enhancing environmental and handling safety.
WO2026041525A1 Publication Date: 2026-02-26THOR GMBH
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Patent Information
- Application Number
- PCT/EP2025/073314
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-08-21
- Filing Date
- 2025-08-14
- Publication Date
- 2026-02-26
AI Technical Summary
Technical Problem
Existing aqueous adhesive compositions face challenges in microbial infestation due to contamination from bacteria, yeasts, and fungi, necessitating high pH values and conventional preservatives, which are subject to legal restrictions and cause handling issues and alkaliphilic microbial growth.
Method used
Aqueous adhesive compositions stabilized by incorporating 0.03 to 1.4 wt.% guanidine or its salts and maintaining a pH range of 7.5 to 12.0, preferably 8 to 11.5, to enhance microbial resistance without relying heavily on traditional preservatives.
Benefits of technology
The compositions exhibit excellent resistance to microbial attack, particularly during storage, with reduced preservative use, improving environmental compatibility and processing safety.
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Abstract
The invention relates to aqueous adhesive compositions which contain at least the following components: (a) 1 to 95 wt. %, calculated as the solids content of a base component, containing: (a1) at least one polymeric organic binder, selected from acrylate, styrene, vinyl acetate, vinyl propionate and / or urethane homopolymers or copolymers, or any mixture thereof, and / or (a2) at least one polysaccharide thickener, selected from the group consisting of cellulose ethers, such as methyl cellulose, carboxyalkyl cellulose, in particular carboxymethyl cellulose, hydroxyalkyl cellulose, alkyl hydroxyalkyl cellulose, starch, in particular potato starch, starch ethers, in particular modified amylose and / or amylopectin, guar ethers, dextrins and mixtures of said compounds; (b) water; and (c) 0.03 to 1.4 wt. % guanidine and / or at least one salt of guanidine, wherein the proportion by weight refers to the content of guanidine in the total aqueous adhesive composition.
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