US 5,965,626 A · Method of making rigid asphaltic foam

Abstract

An asphaltic isocyanurate foam useful in roofing applications. The foam is made from asphalt having a penetration range of between approximately 5-25, a softening point of between approximately 120.degree. F. and 200.degree. F., and an asphaltene content of no more than about 30%. This asphalt is liquified and mixed with a mixture of polyols such as Voranol 270, Multranol 9138, and castor oil. Other chemicals, such as a surfactant, a viscosity reducer, and a flame retardant can also be included in this mixture. The mixture is then brought to a temperature of between approximately 140.degree. F. and 220.degree. F., mixed with water and a polyisocyanate in a molar ratio of polyisocyanate:polyol of between about 2.0:1 and about 2.5:1 and reacted to form an asphaltic isocyanurate foam.

Claims21

Dependent claims

A method for producing a rigid asphaltic foam, comprising the steps of:

(a) providing asphalt having a penetration range of between approximately 5-25, an asphaltene content of between about 20% and about 30% by weight, and a softening point of between approximately 120.degree. F. and 200.degree. F.;
(b) liquefying said asphalt;
(c) adding to said asphalt one or more polyols, thereby forming an intermediate mixture;
(d) bringing the temperature of said intermediate mixture to between approximately 140.degree. F. and 220.degree. F.;
(e) adding a blowing agent to said intermediate mixture, thereby forming a foamable mixture;
and
(f) mixing a polyisocyanate with said foamable mixture, thereby forming a final reaction mixture wherein said polyisocyanate and said foamable mixture react to form said asphaltic foam.

4 more elements

Dependencies are inferred from the claim text.

Method of making rigid asphaltic foam

Life of this patent

Method of making rigid asphaltic foam

Life of this patent

Abstract

Claims21