Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From aldehyde or derivative thereof as reactant
Patent
1984-11-27
1986-07-29
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From aldehyde or derivative thereof as reactant
C08G 1212
Patent
active
046031910
ABSTRACT:
Urea and formaldehyde are mixed in a mole ratio of about 1:2. The mixture is condensed for 30 minutes at a pH of 7.0 to 7.4 and a temperature between 80.degree. and 85.degree. C. The condensation is continued at a pH of 4.8 to 5.8 at the same temperature until the viscosity reaches values between 15 and 50 mPa.s. The mole ratio of urea to formaldehyde is adjusted to a value of 1:1.80 to 1:1.90 by adding urea. The condensation is continued under acidic conditions at the same temperature, until the viscosity reaches values of 35 to 80 mPa.s. At a pH of 5.8 to 6.5, the mole ratio of urea to formaldehyde is adjusted to a value between 1.0:1.0 and 1.0:1.30 by adding urea. The temperature is allowed to drop freely. When the temperature has dropped to below 50.degree. C., the pH is adjusted to a value of 7.0 to 8.0.
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Enigma N.V.
Sarofim N.
Schofer Joseph L.
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