Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant which is a cellular material derived from...
Patent
1981-12-28
1984-02-21
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant which is a cellular material derived from...
528 1, 528129, 428528, 428529, C08H 504, C08G 8300
Patent
active
044331266
ABSTRACT:
This application discloses a phenol-formaldehyde binding resin formed from phenol and formaldehyde in mole ratio of one mole of phenol to 2 to 3 moles of formaldehyde, the resin being modified by replacing from 5% to 50% of the phenol by an equivalent amount of a concentrated aqueous complex of phenolic and carbohydrate components from the process water from the steam digestion of wood chips without chemical addition, said resin being formed by heating said mixture of phenol, formaldehyde and aqueous complex with aqueous alkali to a temperature not exceeding about 100.degree. C. until a resin having a Brookfield viscosity of at least 35 centipoises is produced, all weights being determined on a dry basis; and a method of producing said resin by reacting a concentrated aqueous extract obtained from the steam digestion of wood chips with phenol and formaldehyde under alkaline conditions at a temperature not exceeding about 100.degree. C. until a resin with a Brookfield viscosity of at least about 35 cps is produced, the mole ratio of phenolic compounds (that is, the phenol plus the phenolic compounds in the aqueous extract) to formaldehyde being in the range from 1:2 to 1:3, the weight of concentrated aqueous extract being from 5% to 50% of the weight of the phenol, calculated on the dry weight of each material.
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Chang, C. D., and Kononenko, O. K., "Sucrose-Modified Phenolic Resins as Plywood Adhesives", Adhesives Age, Jul. 1962, pp. 36-40.
Hsu Oscar H. H.
Tassler Milford C.
Kight III John
Masonite Corporation
Nutter Nathan M.
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