POE-free adhesion promoters for sustainable timber construction
The adhesive system with polyglycerol-based primers and NCO-containing adhesives addresses the challenge of bonding hardwoods by improving delamination resistance and shear strength, while eliminating the need for toxic POE derivatives, suitable for industrial applications.
Patent Information
- Application Number
- PCT/EP2025/082464
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-11-21
- Filing Date
- 2025-11-10
- Publication Date
- 2026-05-28
AI Technical Summary
Current adhesive systems for structural glued laminated timber construction using hardwoods, particularly beech and oak, often fail to meet strength requirements in delamination tests and shear strength, especially when exposed to moisture, and rely on toxic or hazardous compounds like POE derivatives.
An adhesive system comprising a primer composition of polyglycerol partial esters and/or polyglycerols, optionally with surfactants and solvents, combined with a moisture-curing NCO-containing adhesive composition, which improves bonding on various lignocellulosic materials, including hardwoods, without using POE derivatives.
The primer composition significantly enhances delamination resistance and shear strength of bonded wood specimens, meeting industry standards and avoiding the use of hazardous chemicals, thus facilitating efficient industrial production.