Process for the preparation of novolaks and their use

Details Process for the preparation of novolaks and their use Process for the preparation of novolaks and their use

C - Chemistry, Metallurgy

08

G

400/1106, 402/31

C08G 8/00 (2006.01) C08F 8/02 (2006.01) C08G 8/04 (2006.01) C08G 8/26 (2006.01) C08L 61/00 (2006.01) C08L 61/04 (2006.01) C08L 101/00 (2006.01)

Patent

CA 2008326

HOE 89/F 023 Abstract: Process for the preparation of novolaks and their use The preparation of novolaks from phenols or mixtures of different phenols, and oxo compounds or mixtures of oxo compounds by condensation of the reactants in a medium having a low water content in homogeneous phase at temperatures of ? 110°C, preferably between 115 and 200°C and preferably at normal pressure, in the presence of water-immiscible and/or only partially water-miscible inert organic solvents and of acids as catalysts with removal of water by distillation, the medium having a low water content being prepared or maintained by distilling off water from the reaction mixture, preferably by azeotropic distillation. Particular advantages are obtained when readily volatile oxo compounds, in par- ticular aqueous formaldehyde solutions, are used. Use of the novolaks as reinforcing resins for rubber and elastomers, as tackifiers for rubber, as binders for friction linings, as curable molding compositions, impregnating agents, coatings, paints and as binders for fine-particle inorganic substrates.

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