Lignin modified phenol-formaldehyde resins

Details Lignin modified phenol-formaldehyde resins Lignin modified phenol-formaldehyde resins

1992-01-15

1993-04-13

Nutter, Nathan M.

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

Synthetic resins

From lignin, tannin, or derivative reactant

525 5442, 528155, 530501, 530502, C08H 502, C08G 6348, C08G 6391

Patent

active

052024032

ABSTRACT:
A modified resole resin and an adhesive composition containing the resin wherein the resin is prepared by first reacting formaldehyde and a phenol at a mole ratio of formaldehyde to phenol of less than about 1.0 in the presence of alkaline in an amount sufficient to provide a mole ratio of said alkaline material to phenol between about 0.04 and 0.08 to form a precursor resin; reacting the precursor resin with lignin to form a lignin-modified phenol-formaldehyde precursor resin, and then reacting the lignin-modified phenol-formaldehyde precursor with additional formaldehyde sufficient to provide a cumulative formaldehyde to phenol mole ratio of between about 2.0 and about 3.0. The adhesive composition is useful in bonding wood chips, veneers and sheets of plywood.

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