Verfahren zur Herstellung von Melamin-Formaldehyd-Harz mit Niedrigem Restmelamingehalt

Details

Veröffentlichungs-Nr.

EP4733337

Anmeldetag

28. Oktober 2024

Veröffentlichung

29. April 2026

Rechtsraum

EP

Abstract

The invention relates to a process for the preparation of a melamine-formaldehyde resin composition comprising the steps of: a) Preparing a slurry of melamine in a solution of a first amount of formaldehyde in water, b) adjusting pH of the slurry in a range between 8.3 and 10.5, c) Reacting the melamine and the formaldehyde in the slurry at a first temperature between 90 and 120°C until d) a first water dilutability between 1:3 and 1:10, e) cooling to a second temperature between 70 and 95°C f) at the second temperature adding a second amount of formaldehyde and optionally adjusting the pH in the abovementioned range, g) holding at the second temperature until a second water dilutability is reached that is lower than the first water dilutability and h) cooling. The invention also relates to a melamine-formaldehyde resin composition obtainable by the process having a residual (free) melamine content below 3 wt.%, to curable melamine-formaldehyde resin composition comprising the melamine-formaldehyde resin composition and a catalyst and various uses thereof.

Anmelder

Firma

KremsChem Austria GmbH

Land

🇦🇹 Österreich