Process for producing urethane foam with high density skin

Details Process for producing urethane foam with high density skin Process for producing urethane foam with high density skin

1991-09-18

1993-08-31

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521128, 521129, C08J 908, C08G 820

Patent

active

052409643

ABSTRACT:
A process for producing a urethane foam having a high density outer surface layer, of the type wherein a plastic liquid containing aromatic isocyanates, polyols, a catalyst, low-molecular polyols used as a crosslinker or a chain extender, a blowing agent consisting of water, and an assistant is poured into a closed mold through a one-shot molding process, a certain type of catalyst is added to create a difference in gas evolving reaction between an inner part and an outer part of the plastic liquid within the mold so as to form a high density layer on the outer surface of a urethane form. The catalyst includes a piperazine compound, a morpholine compound, or a mixture thereof. An imidazole compound, a triazine compound, an amidine compound or an organic acid salt of the amidine compound, or a mixture resulting from any combination thereof may be used in combination with the piperazine compound or a morpholine compound.

REFERENCES:
patent: 4701473 (1987-10-01), Hasegawa et al.
patent: 4981877 (1991-01-01), Carswell
patent: 5057543 (1991-10-01), Carswell
patent: 5070110 (1991-12-01), Carswell et al.

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