Polyisocyanurate foams of improved friability and process of...

Details Polyisocyanurate foams of improved friability and process of... Polyisocyanurate foams of improved friability and process of...

C - Chemistry, Metallurgy

08

G

403/13

C08G 18/61 (2006.01) C08G 18/02 (2006.01) C08G 18/09 (2006.01) C08G 18/28 (2006.01)

Patent

CA 1222098

ABSTRACT OF THE DISCLOSURE In a process of preparing a polyisocyanurate foam, which process comprises: reacting a polyisocyanate in the pre- sence of a trimerization catalyst and an expanding amount of an inert blowing agent to provide a polyisocyanurate foam, the improvement which comprises: carrying out the reaction in the presence of from about four to twenty percent by weight of a surface-active organic silicone compound characterized by an active hydrogen functionality, and having a hydroxyl number of greater than about 30 and an equivalent weight of less than about 2000 to provide a polyisocyanurate foam of improved friability and good flame, heat and stability properties.

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