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

1977-07-26

1978-12-19

Ivy, C. Warren

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521119, 521136, 521174, C08G 1854, C08G 1815

Patent

active

041306970

ABSTRACT:
Foamed plastics with improved combustion characteristics are produced by condensing an aqueous solution of formaldehyde-urea and/or melamine precondensates with polyisocyanates and optionally a polyol in the presence of an acid catalyst, being present in an amount of 1 part by weight per at least 20 parts by weight of precondensate, whereby this catalyst is added to the isocyanate before mixing with the precondensate or to the mixture of isocyanate and precondensate, but separately from the precondensate.

REFERENCES:
patent: 3632531 (1972-01-01), Rush
patent: 3806006 (1957-09-01), Proctor

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