Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-04-24
1980-03-25
Hayes, Lorenzo B.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
106123R, 260 294R, 264109, C08L 9700
Patent
active
041949978
ABSTRACT:
An adhesive product particularly suitable for use in the manufacture of wood particle board comprises from 50-90 parts by weight urea formaldehyde resin and from 10-50 parts by weight spent liquor from the acid sulfite pulping of lignocellulose, the adhesive product containing from 0.2 to 4.0% by weight ammonium ion (expressed as NH.sub.3)based on the spent liquor solids. The sulfite spent liquor component of the mixture prior to mixing has a pH of from 3-9; the urea formaldehye resin prior to mixing, a pH of from 6 to 8. The urea formaldehye resin is further characterized by a molar ratio of formaldehyde to urea of from 1.0 to 1.8, and a methylol content corresponding to a Witte number of from 1.0 to 1.8.
Glued wood products such as wood particle board are made using the herein described adhesive by applying to the surfaces of wood particles a bonding quantity of the foregoing adhesive, assembling the adhesive-coated pieces, and hot pressing the resulting assembly to cure the adhesive and bond the pieces together.
REFERENCES:
patent: 2405650 (1946-08-01), Hartwig et al.
patent: 2622979 (1952-12-01), Keim
patent: 3313745 (1967-04-01), Klug
patent: 3395033 (1968-07-01), Remer
patent: 3990928 (1976-11-01), Schmidt-Hellerau
patent: 3994850 (1976-11-01), Willegger et al.
Farley Eugene D.
Hayes Lorenzo B.
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