Process for the production of foamed plastics with improved...

Details Process for the production of foamed plastics with improved... Process for the production of foamed plastics with improved...

C - Chemistry, Metallurgy

08

G

403/31

C08G 18/54 (2006.01) C08G 18/10 (2006.01) C08G 18/14 (1980.01)

Patent

CA 1102495

Abstract of Disclosure Foamed plastics with improved combustion characteristics and good mechanical strength are obtained by condensation of aminoplast precondensates with organic isocyanates in the presence of an acid curing catalyst and an accelerator for polyurethane formation, whereby the precondensate used as starting material is prepared by reacting formaldehyde with urea and/or melamine in a molar ratio 1.80 to 4.5 : 1 at pH values of 4 to 9.5, adjusting then the pH to 7.0 to 8.0 and adding urea to obtain a molar ratio of formaldehyde to the total amount of aminoplast forming compound of 1.0 - 2.1 : 1.

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