Method of making insulating rigid polyurethane foams

Details Method of making insulating rigid polyurethane foams Method of making insulating rigid polyurethane foams

1995-11-01

1996-06-11

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521129, 521164, 521167, C08G 1818

Patent

active

055256414

ABSTRACT:
There is now provided a method for making a polyisocyanate based rigid closed cell foam made by reacting an organic isocyanate with a polyol composition made up of at least:
a) an aromatic amine initiated polyoxyalkylene polyether polyol having an hydroxyl number of 200 meq polyol/g KOH or more;
b) an aliphatic amine initiated polyoxyalkylene polyether polyol having an hydroxyl number of 200 meq polyol/g KOH or more in an amount of 10 weight percent or less based on the weight of the polyol composition; and
c) cyclopentane,
wherein the cyclopentane is dissolved in the polyol composition. The organic isocyanate and the polyol composition are reacted at an isocyanate index ranging from 80 to less than 150, and throughout this isocyanate index range, the resulting foam has a substantially constant k-factor and is dimensionally stable.

REFERENCES:
patent: 5391317 (1995-02-01), Smits
"An Insight Into the Characteristics of a Nucleation Catalyst in CFC-Free Rigid Foam Systems", 35th Annual Polyurethane Technical/Marketing Conference, Oct. 9-12, 1994, by H. Yoshimura, Y. Tamano, S. Okuzono, D. Lowe, pp. 300-310.

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