Phenolic resol plywood resin, manufacture and use

Details Phenolic resol plywood resin, manufacture and use Phenolic resol plywood resin, manufacture and use

C - Chemistry, Metallurgy

08

L

C08L 61/04 (2006.01) C08G 8/10 (2006.01) C08K 3/26 (2006.01) C09J 161/04 (2006.01) C09J 161/06 (2006.01)

Patent

CA 2103250

An aqueous phenol-formaldehyde resin solution with formaldehyde-phenol mol ratio in the range of 1.8 to 2.8, polymeri- zation catalyst of 3 % to 9 % by weight, measured as NaOH equivalent, with less than 1 % by weight potassium hydroxide, and about 1 % to about .75 % by weight potassium carbonate added after the catalytically-activated polymerization reaction has sub- sided while the resin is both soluble and fusible ("A" resol stage). Adhesive binders exhibit tolerance for variables in veneer mois- ture content from 0 % to around 25 % and in production timing from delivery of the veneer for assembly to curing of around 10 minutes to about 2 hours without significant degradation of bonding quality.

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