C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
403/55, 402/93
C08G 12/12 (2006.01) C08G 12/04 (2006.01) C08G 12/40 (2006.01) C08J 9/14 (2006.01)
Patent
CA 1321443
ABSTRACT The invention relates to strongly exothermally setting urea-formaldehyde resin, obtained by condensation of urea with formaldehyde under alkaline conditions, wherein it is obtained by a) condensation in a first condensation stage I of 0.2 to 0.7, preferably 0.5 moles of urea with 1.2 to 3 moles, preferably with 1.7 to 2.2 moles of formaldehyde in the form of solid paraformaldehyde, under exclusively alkaline conditions, at a spontaneously establishing initial pH of 8 to 12, preferably 9 to 11, b) in the presence of 1 to 10 mmoles of NaCH and 10 to 80 mmoles or NH3 or in the presence of 2.5 to 50 mmoles of guanidine base and 0 to 80 mmoles of NH3 per 1 mole of formaldehyde c) at a condensation temperature (I) of 90 to 110°C, d) for a condensation time (I) of 10 to 100 minutes, preferably 15 to 70 minutes, and e) subsequent addition, in a second condensation stage II, of a further 0.2 to 0.7, preferably 0.5 moles of urea, f) at a condensation temperature (II) of 105 to 120°C, g) for a further condensation time (II) of 1.5 to 5 hours. It offers advantages due to freedom from pollution, freedom from waste water, reduced energy and plant costs, improved drying of the expanded materials and increase economy.
584443
Borden Ladner Gervais Llp
Schollhorn Wolf Dietrich
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