Phenolic resol plywood resin, manufacture and use

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

1992-03-20

1994-08-30

Michl, Paul R.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524594, 528147, 528488, 528489, C08K 326

Patent

active

053428803

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: 3342776 (1967-09-01), Lambuth
patent: 3696064 (1972-10-01), Re
patent: 4194996 (1980-03-01), Babina et al.
patent: 4608408 (1986-08-01), Hood et al.
patent: 4758478 (1988-07-01), Daisy et al.

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