Bark extended phenol-formaldehyde resins and multiple alkali...

Details Bark extended phenol-formaldehyde resins and multiple alkali... Bark extended phenol-formaldehyde resins and multiple alkali...

C - Chemistry, Metallurgy

08

G

400/1315

C08G 8/28 (2006.01) C09B 15/00 (2006.01) C09J 161/14 (2006.01)

Patent

CA 1109190

BARK EXTENDED PHENOL-FORMALDEHYDE RESINS AND MULTIPLE ALKALI ADDITION PROCESS FOR THE PREPARATION THEREOF ABSTRACT OF THE DISCLOSURE 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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