C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
403/13, 154/123.
C08G 18/00 (2006.01) C08G 18/48 (2006.01) C08J 5/12 (2006.01)
Patent
CA 1283999
ABSTRACT Rigid polyisocyanurate foams are prepared by reacting together an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol, the polyol comprising a sufficient proportion of at least one polyoxyalkylene polyol having (i) terminal oxypropylene oxide blocks, (ii) a molecular weight of from about 300 to 3000, and (iii) an average hydroxyl functionality of from about 2 to 5 to form a foamed polyisocyanurate whose gel time is greater than about 70 seconds and friability is less than about 20 percent, as measured by the ASTM C-421 friability test. Laminates of such foams exhibit a high degree of fire resistance, low foam friability and good facer adhesion.
535771
Celotex Corporation (the)
Gowling Lafleur Henderson Llp
LandOfFree
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