Curable compositions comprising at least one guanidine-based curing catalyst

The use of a guanidine-based catalyst in a curable composition addresses the limitations of conventional vulcanization catalysts by providing high-performance, environmentally friendly adhesives and sealants with reduced yellowing and improved mechanical properties.

WO2026131397A1PCT designated stage Publication Date: 2026-06-25HENKEL KGAA
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
HENKEL KGAA
Filing Date
2025-12-11
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Conventional catalysts for vulcanizing silicon-containing polymers, such as organotin compounds, face issues with toxicity, environmental concerns, and compatibility with aminosilanes, while alternative metal-based catalysts like titanium compounds lack stability and catalytic activity.

Method used

A curable composition using a guanidine-based catalyst with a specific formula (G1) is introduced, comprising silane-modified polymers, aminosilanes, and optional additives like surface-treated calcium carbonate and silica, which provides excellent mechanical properties and reduced yellowing.

Benefits of technology

The guanidine-based catalyst achieves high performance, environmental safety, and ease of use, with reduced yellowing and improved mechanical properties, comparable to conventional systems but without harmful substances, and is suitable for adhesives, sealants, and coatings.

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Abstract

The invention relates to a curable composition comprising (I) at least one silane-modified polymer and / or at least one organopolysiloxane polymer; (II) at least one aminosilane or aminosilane oligomer; (III) at least one guanidine catalyst of Formula (G1) wherein R1 is hydrogen; R2 is selected from the group consisting of optionally substituted alkyls comprising at least 3 carbon atoms, optionally substituted cycloalkyls comprising at least 3 carbon atoms, and optionally substituted C6-C18 aryl; preferably from the group consisting of optionally substituted C3-C8 alkyls, optionally substituted C3-C10 cycloalkyls, and optionally substituted C6-C18 aryl; more preferably R2 is selected from C3-C10 cycloalkyls; R3 is selected from optionally substituted alkyls comprising at least 2 carbon atoms; preferably from optionally substituted C2-C8 alkyls; R4 is selected from optionally substituted alkyls comprising at least 2 carbon atoms; preferably from optionally substituted C2-C8 alkyls; wherein R3 and R4 can be linked so as to form a 3-, 4-, 5-, 6- or 7-membered aliphatic ring, preferably a 5- or 6-membered aliphatic ring, optionally substituted with one or more substituents; and R5 is selected from the group consisting of optionally substituted alkyls comprising at least 3 carbon atoms, optionally substituted cycloalkyls comprising at least 3 carbon atoms, and optionally substituted C6-C18 aryl; preferably from the group consisting of optionally substituted C3-C8 alkyls, optionally substituted C3-C10 cycloalkyls, and optionally substituted C6-C18 aryl; more preferably R5 is selected from C3-C10 cycloalkyls; (IV) optionally, surface treated calcium carbonate; (V) optionally, surface treated silica; and (VI) optionally, at least one plasticizer. The invention also relates to adhesive, sealant, and / or coating materials comprising said composition, the use of at least one guanidine catalyst of Formula (G1) and the use of said composition.
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