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...
Patent
1993-04-29
1994-03-01
Hoke, Veronica P.
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...
428117, 4283126, 428436, 528138, 524493, 524494, 524701, C08K 714, C08K 338
Patent
active
052908437
ABSTRACT:
The present invention is directed to a phenolic resin composition useful for preparing a binder for reinforced composites, to a binder for reinforced composites made using the phenolic resin composition, and to a reinforced composite made using the binder. The phenolic resin composition of the present invention contains an aqueous mixture of: (a) a resole formed by reacting phenol with formaldehyde in the presence of an ortho directing catalyst at a mole ratio of formaldehyde to phenol ranging from about 0.7:1 to about 3:1 and (b) a water-soluble borate, wherein the composition contains at least about 0.02 equivalent of the ortho directing catalyst per mole of phenol, has a pH at least about 7 and contains from about 0.02 to about 0.5 mole borate per mole of phenol. When the ortho directing catalyst has a cation that forms an insoluble material with a borate anion, the cation is removed after the resole is formed and prior to adding the water-soluble borate.
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Knudsen Mark J.
McDonald Roderick A.
Georgia-Pacific Resins Inc.
Hoke Veronica P.
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