One-component moisture-curable adhesive composition

The described adhesive composition, with a specific polyol mixture and chain extender, addresses low green strength and delamination issues in laminated timber products by enhancing initial bond strength and reducing separation, ensuring robust assembly and pressing processes.

WO2026013231A1PCT designated stage Publication Date: 2026-01-15AKZO NOBEL COATINGS INT BV
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Patent Information

Application Number
PCT/EP2025/069843
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-07-12
Filing Date
2025-07-10
Publication Date
2026-01-15

AI Technical Summary

Technical Problem

Existing one-component moisture-curing polyurethane adhesives for laminated timber products exhibit low initial bond strength (green strength) and are prone to delamination, necessitating careful handling and posing challenges in assembly and pressing processes.

Method used

A one-component moisture-curable adhesive composition comprising an isocyanate-functional prepolymer prepared by reacting excess polyisocyanates with a specific polyol mixture, featuring a polyol mixture of linear butylene oxide-based diol and polyether triol, and a chain extender with a functionality of 2 to 5 and molecular weight of 50-400 g/mol, maintaining a free isocyanate group content of 13 to 18 wt%, enhances green strength and reduces delamination.

Benefits of technology

The adhesive composition provides improved green strength and significantly reduces delamination in laminated timber products while maintaining favorable assembly conditions and mechanical properties.

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Abstract

A one-component moisture-curing adhesive composition comprising from 80 to 100 wt% of an isocyanate-functional prepolymer obtainable by reacting: (a) a polyisocyanate component comprising methyl diphenyl diisocyanate; and (b) a polyol mixture comprising: (b1) a linear butylene oxide-based diol with two primary hydroxyl groups; and (b2) a polyether triol with three secondary hydroxyl groups; (c) a chain extender, which chain extender is different from (b1) or (b2), has a functionality of from 2 to 5, a molecular weight of from 50-400 g / mol and at least two groups which are reactive with an isocyanate group; wherein the equivalent ratio between isocyanate groups in (a) and hydroxyl groups in (b) is in the range of from 3.5 to 7.0; and wherein the content of free isocyanate groups in the adhesive composition is in the range of from 13 to 18 wt%; a method of making the prepolymer, a bonded material and a method of bonding material using an adhesive.
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Citation Information

Patent Citations

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    US20050032972A1

  • Neutral-coloured 1K polyurethane adhesive

    US20050137377A1

  • Aqueous polyurethane resin composition and one-component adhesive agent and laminated body that use the dame, and method for manufacturing aqueous polyurethane resin composition

    US20100004386A1

  • Polyisocyanate adhesive for plywood

    WO1999019141A1

  • One-component type polyurethane prepolymer composition

    WO2021022470A1