Fast curing phenolic resins and bonding methods employing same

Details Fast curing phenolic resins and bonding methods employing same Fast curing phenolic resins and bonding methods employing same

1986-09-30

1988-07-19

Gallagher, John J.

Stock material or miscellaneous articles

Composite

Of aldehyde or ketone condensation product

1563073, 156335, 528147, 528165, B32B 2108, C09J 502

Patent

active

047584785

ABSTRACT:
It has now been found that when there is a partial or complete replacement of the sodium hydroxide that is used to make a sodium phenolate resole resin by a molar equivalent of potassium hydroxide, a far faster curing resin is obtained. Such potassium-modified phenoli resins exhibit significant improvement in cure speed without loss of flowability. To the contrary, these resins act as though they were lower molecular weight condensation products. Reduced application rates are possible. The combination of faster cure and lower application rates has allowed such resins to be used as effective adhesives for plywood, for example, with veneer and interior plies having a higher moisture content than was previously possible. Generally, resins according to the invention may contain from about 1% to about 15%, and preferably from about 1% to about 7% by weight, of potassium hydroxide, or more.

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