Phenolic resol plywood resin, manufacture and use

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

1994-06-13

1995-09-19

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

524594, 524596, 528147, 528489, C08J 303

Patent

active

054516579

ABSTRACT:
An aqueous phenol-formaldehyde resin solution with formaldehyde-phenol mol ratio in the range of 1.8 to 2.8, polymerization catalyst of 3% to 9% by weight, measured as NaOH equivalent, with less than 1% by weight potassium hydroxide, and about 0.1% to about 0.75% by weight potassium carbonate added after the catalytically-activated polymerization reaction has subsided while the resin is both soluble and fusible ("A" resol stage). Adhesive binders exhibit tolerance for variables in veneer moisture 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.

REFERENCES:
patent: 5342880 (1994-08-01), Chappelie

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