Intumescent coating composition
WO2025186281A8 Publication Date: 2025-10-02JOTUN AS
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Patent Information
- Application Number
- PCT/EP2025/055888
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-03-05
- Filing Date
- 2025-03-04
- Publication Date
- 2025-10-02
AI Technical Summary
Technical Problem
Intumescent coatings used for fire protection on steel substrates often develop nodules on the char surface, which weaken the insulating layer and reduce its efficiency, and existing solutions may compromise fire resistance.
Method used
A solvent-borne intumescent coating composition containing polyvinyl ester-based and/or (meth)acrylic-based binders, an acid-generating agent, carbon donor, and dicyandiamide, with a specific weight ratio, to produce a char with fewer and smaller nodules, maintaining or improving fire resistance.
Benefits of technology
The coating composition forms a char with reduced nodules and improved insulating properties, maintaining or enhancing the time-to-failure (TTF) without using melamine derivatives.
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Abstract
A solvent-borne intumescent coating composition comprising: a) at least 5.0 wt% relative to the total weight of the intumescent coating composition of a polyvinyl ester-based binder and / or a (meth)acrylic-based binder; b) an acid-generating agent; c) a carbon donor d) at least 4.0 wt% relative to the total weight of the intumescent coating composition of dicyandiamide; wherein the weight ratio of components b):c) is in the range of 2:1 to 4:1.
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