Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-05-30
1979-09-25
Woodberry, Edward M.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
428529, C08L 102
Patent
active
041690770
ABSTRACT:
A modified phenol-formaldehyde resin is formed by reacting phenol and formaldehyde in the presence of alkali and finely divided wood bark, preferably where the bark is pre-treated with alkali. The molar ratio of formaldehyde to phenol ranges from about 3 to 1.6. The molar ratio of alkali to phenol ranges from about 0.5 to about 1.0, said alkali being added to the formaldehyde-phenol mixture in three stages, each stage containing about one-third of the total alkali used. The amount of bark employed ranges from about 10 to about 40% of the amount of phenol. Adhesives prepared from these resins are suitable for use in the manufacture of plywood having both western mill and southern pine mill veneers.
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patent: 3213045 (1965-10-01), Klein et al.
patent: 3268460 (1966-08-01), Miller et al.
patent: 3371054 (1968-02-01), Blickensderfer
patent: 3580872 (1971-05-01), Lambuth
Chem. Absts., vol. 68:14250x, Phenol-Formaldehyde Condensates, Brown et al.
Champion International Corporation
Sommer Evelyn M.
Woodberry Edward M.
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