Lignin-containing resin adhesive

Details Lignin-containing resin adhesive Lignin-containing resin adhesive

1980-07-24

1981-12-01

Nielsen, Earl A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

156335, C08G 828, C08L 9700

Patent

active

043035620

ABSTRACT:
Novel lignin-phenol-formaldehyde resins, suitable for use as wood bonding adhesives, are provided by a two-step method which comprises reacting formaldehyde and phenol in the presence of an alkaline catalyst for a period sufficient to produce a partially condensed phenol-formaldehyde resin, thereafter reacting said precondensed resin with sodium hydroxide, formaldehyde and a lignin concentrate having at least 40% solids and comprising lignin dissolved in (a) phenol and water; or (b) phenol, water and sodium hydroxide or ammonia, the lignin to phenol weight ratios in said solution being less than 70:30 and more than 40:60. The second stage of the method is conducted at reflux temperature initially after which reaction is conducted below reflux temperature to control the degree of condensation.

REFERENCES:
patent: 2168160 (1939-08-01), Hochwalt et al.
patent: 2282518 (1942-05-01), Hochwalt et al.
patent: 3090700 (1963-05-01), Ball et al.
patent: 3185654 (1965-05-01), Ball et al.
patent: 3216839 (1965-11-01), Webster
patent: 3454508 (1969-07-01), Herrick et al.
patent: 3551405 (1970-12-01), Read
patent: 3864291 (1975-02-01), Enkvist
patent: 4113675 (1978-09-01), Clarke et al.

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