IP Verse

Foundry Binder System With A Low Formaldehyde Content And Process For Obtaining It

Patent No. EP3530685 (titled "Foundry Binder System With A Low Formaldehyde Content And Process For Obtaining It") was filed by Cavenaghi on Apr 21, 2016. The application was issued on Sep 10, 2025.

Patent Summary

This method produces furan resins with low free formaldehyde content (preferably <0.1% by weight) for use in foundry binder systems, refractory bricks, or refractory masses. The process comprises three primary steps: (a) reacting furfuryl alcohol and formaldehyde using an acid catalyst; (b) heat-treating the resulting condensation polymer with a strong base at 90°C to 115°C; and (c) adding urea. The method specifically excludes the addition of 4,4'-isopropylidenediphenol. The resulting resins are suitable for no-bake foundry processes when mixed with silica sand or other granular substances and an acid hardener (e.g., toluenesulfonic acid). Optional steps include cooling the resin below 40°C and adding silane compounds, such as 3-aminopropyltriethoxysilane, to improve performance.

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Patent Oppositions (2)

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.

CompanyOpposition DateRepresentative
ASK CHEMICALSJun 10, 2026MULLER SCHUPFNER & PARTNER PATENT UND RECHTSANWALTSPARTNERSCHAFT MBB HAMBURG
HUTTENES ALBERTUS CHEMISCHE WERKE GESELLSCHAFT MIT BESCHRANKTER HAFTUNGJun 10, 2026EISENFUHR SPEISER

Dossier Documents

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  • Date

    Description

EP3530685

CAVENAGHI
Application Number
EP19156445A
Filing Date
Apr 21, 2016
Status
Granted And Under Opposition
Aug 8, 2025
Publication Date
Sep 10, 2025
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