Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1975-09-15
1976-12-07
Czaja, Donald E.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 69R;71, C08G 1212
Patent
active
039961907
ABSTRACT:
In the production of urea/formaldehyde molding resins, wherein urea and formaldehyde are reacted under alkaline conditions to form a liquid resinous composition, the composition is blended with a filler and the filled composition is dried, there is provided an improvement comprising reducing the level of formaldehyde fumes discharged to the atmosphere during drying by a process which comprises the steps of:
A. charging urea and formaldehyde to a reaction vessel in amounts to provide an initial mol ratio of formaldehyde to urea of about 1.0 to about 2.0 mols formaldehyde per mol of urea;
B. reacting the urea and formaldehyde in water at a temperature in the range of about 50.degree. to 65.degree. C. and at a pH of about 7.0 to about 9.0;
C. continuing the reaction until the mol ratio of formaldehyde to urea in the resin is at least about 75 percent of the initial mol ratio; and
D. adding additional urea in an amount of about 0.5 to 10 percent by weight based upon the amount of urea initially charged; whereby the amount of formaldehyde discharged to the atmosphere is reduced.
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O'Neill Charles T.
Steiger Edward L.
Allied Chemical Corporation
Criss Roger H.
Czaja Donald E.
Jarosz Michael S.
Person S. M.
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