Process for the production of foamed plastics with improved comb

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

1978-07-11

1979-07-03

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521118, 521136, 528 44, 528 73, C08J 900

Patent

active

041600754

ABSTRACT:
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 of 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 offormaldehyde to the total amount of aminoplast forming compound of 1.0-2.1:1.

REFERENCES:
patent: 2806006 (1957-09-01), Proctor
patent: 3523093 (1970-08-01), Stomberger
patent: 3632531 (1972-01-01), Rush

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