Process for the preparation of phenol formaldehyde resole resins

Details Process for the preparation of phenol formaldehyde resole resins Process for the preparation of phenol formaldehyde resole resins

1986-03-27

1987-04-07

Schain, Howard E.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528137, 528145, 528146, 528147, 528153, 528155, 528165, C08G 808, C08G 810

Patent

active

046562397

ABSTRACT:
The process described herein involves the gradual addition of aqueous formaldehyde, containing 35-60 percent by weight of formaldehyde, to a phenol maintained at a temperature of 60.degree.-100.degree. C., preferably 70.degree.-90.degree. C., and at a reduced pressure of 11-26 inches of mercury in the presence of an alkaline catalyst. The rate of formaldehyde addition is such that the exothermic reaction aids in maintaining the stated temperature range and thereby simultaneously distills approximately all the water added with the formaldehyde and that formed by the condensation so that the volume of the reaction mass is maintained approximately constant. This constant volume allows efficient use of the equipment.

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patent: 4578448 (1986-03-01), Brode et al.

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