Process for preparing a urea-formaldehyde resin having a...

Details Process for preparing a urea-formaldehyde resin having a... Process for preparing a urea-formaldehyde resin having a...

C - Chemistry, Metallurgy

08

G

402/90

C08G 12/12 (2006.01)

Patent

CA 1242840

A b s t r a c t 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 and 85 °C. The con- densation 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 ad- justed 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 °C, the pH is adjusted to a value of 7.0 to 8Ø

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