Method for producing resols

Details Method for producing resols Method for producing resols

C - Chemistry, Metallurgy

08

G

C08G 8/04 (2006.01) C08G 8/10 (2006.01)

Patent

CA 2326223

The invention relates to a method for producing resols by reacting phenolic compounds with aldehydes using the catalytic effect of metal salts whose cations are easily precipitated as poorly soluble salts in technical procedures. A dispersant is added to the reaction mixture consisting of the phenolic compound, aldehyde and metal salt before, during or after the condensation reaction and once the condensation reaction is complete and the dispersant has been admixed, a complexing agent is admixed. The resulting resins are transparent even after neutralisation with sulphuric acid.

Procédé de préparation de résols par mise en réaction de composés phénoliques avec des aldéhydes sous l'action catalytique de sels métalliques dont les cations peuvent être facilement précipités sous forme de sels peu solubles selon des procédés techniques. Selon ledit procédé, un dispersant est ajouté au mélange de réaction constitué du composé phénolique, d'aldéhyde et de sel métallique avant, pendant ou après la réaction de condensation, et un complexant est ajouté une fois la réaction de condensation terminée et après ajout du dispersant. Les résines ainsi obtenues sont transparentes, même après neutralisation à l'acide sulfurique.

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