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
1994-11-22
1995-12-05
Szekely, Peter A.
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...
524596, 524598, 528164, C08L 6110, C08K 521, C08K 328, C08G 810
Patent
active
054730120
ABSTRACT:
A phenolic binder for glass fibers is prepared using an aqueous mixture including a phenol-formaldehyde resole resin, modified with urea in the presence of ammonia. The urea and ammonia are added after the basic mixture including the resole resin has been neutralized. The urea-modified resole resin shows greater stability than urea-modified resins prepared without ammonia.
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Coventry Kathleen H.
Joachim Jacky
Segal David A.
Certain-Teed Corporation
Szekely Peter A.
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