Method for the preparation of polyurethane foams

Details Method for the preparation of polyurethane foams Method for the preparation of polyurethane foams

1989-07-21

1992-01-21

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521116, 521137, 521174, 521176, C08G 1804, C08G 1867, C08J 900

Patent

active

050828681

ABSTRACT:
A method for the preparation of rigid polyurethane and/or polyisocyanurate foams is disclosed. The foams are produced by the reaction of at least difunctional polyisocyanates, a polyol with 3 to 8 hydroxyl groups, said polyol having a hydroxyl number of about 150 to 800, catalysts, blowing agents and foam stabilizers, which are devoid of silicon atoms, as well as, optionally, conventional additives such as flame retardants and chain extenders. The foam stabilizers are copolymers of vinyl monomers and allyl- or methallyl polyoxalkylene ethers. The mole ratio of the monomers is 1:1 to 10:1.
The foams thus produced exhibit an improved burning behavior, good surface properties and outstanding thermal insulation effects. The stabilizers increase the solubility of the halocarbon blowing agents in the foaming formulation.

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Encyclopedia of Polymer Science and Technology, vol. 10, pp. 1-73.
Organic Surfactants for Rigid Urethane and Isocyanurate Foam, pp. 76-83.

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