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

1990-01-22

1992-02-18

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

526 70, 528125, 528143, 528155, 528156, 528159, 528165, 528497, 528498, C08G 804, C08G 1402, C08G 820, C08F 600

Patent

active

050895893

ABSTRACT:
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 temperature of .gtoreq.110.degree. C., preferably between 115.degree. and 200.degree. 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 particular 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.

REFERENCES:
patent: 2411557 (1943-02-01), Schuk
patent: 3083170 (1963-03-01), Booty
patent: 4025479 (1977-05-01), Jung et al.
patent: 4073826 (1978-02-01), Galkiewicz et al.
patent: 4097463 (1978-06-01), Culbertson
patent: 4812551 (1989-03-01), Oi et al.

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