Molded rigid polyurethane foams prepared from aminoalkylpiperazi

Details Molded rigid polyurethane foams prepared from aminoalkylpiperazi Molded rigid polyurethane foams prepared from aminoalkylpiperazi

1986-06-30

1987-11-03

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

528 73, C08G 1814

Patent

active

047044101

ABSTRACT:
This invention is an improvement in a process for preparing a molded rigid polyurethane or polyurethane-polyurea foam wherein a polyol having an average of at least 3 hydroxyl groups per molecule is reacted with a polyisocyanate in a mold in the presence of a blowing agent under conditions such that a rigid polyurethane or polyurethane-polyurea foam is formed. The improvement comprises employing as all or a portion of said polyol an aminoalkylpiperazine-initiated polyol having an equivalent weight from about 87 to about 500, said aminoalkylpiperazine-initiated polyol being employed in an amount sufficient to increase the cure rate of the foam relative to a similar foam prepared in the absence of the aminoalkylpiperazine-initiated polyol. Excellent flowability k-factors and rapid cures are obtained according to the invention.

REFERENCES:
patent: 3221016 (1965-11-01), Currier et al.
patent: 3251787 (1966-05-01), Bedoit
patent: 3251788 (1966-05-01), Currier et al.

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