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
1984-02-28
1985-02-26
Phynes, Lucille M.
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...
528259, C08L 5100, C08G 1212
Patent
active
045018510
ABSTRACT:
Urea-formaldehyde precursors are produced in a two-stage process. In the first stage, urea is slowly added to an acidic solution of formaldehyde at a pH of 1.0 or less, at a rate that maintains the temperature at 50.degree. C. but not in excess of 98.degree. C. When an F/U mole ratio of 3.25:1 to 2.5:1 has been attained, the pH is adjusted to the basic side, generally from about 7.2 to about 8.0. In the second stage, additional urea is added to the condensate produced in the first stage, to attain an F/U mole ratio of 3.0:1 to 2.5:1. The condensate and precursor have fertilizer applications. The precursor is useful in urea-formaldehyde resin production.
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Borden Inc.
Phynes Lucille M.
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