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US 12,098,545 B2Granted
HFO-containing isocyanate-reactive compositions, related polyurethane foam-forming compositions, and spray-applied polyurethane foams
AssigneeCovestro LLC
InventorEric C. Giles
Life of this patent
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Abstract
Isocyanate-reactive compositions that include a hydrofluoroolefin blowing agent, polyurethane foam-forming compositions, as well as spray-applied polyurethane foams formed therefrom that can provide structural support to wall structures and can also exhibit ASTM E84-16 Class A flame spread and smoke development characteristics at a foam thickness of 4 inches.
Claims16
An isocyanate-reactive composition comprising:
- (a) a terephthalate based aromatic polyester polyol having a functionality of greater than 2.5 and an OH number of at least 300 mg KOH/g, which is present in an amount of at least 50% by weight, based on total weight of the isocyanate-reactive composition;
- (b) a catalyst;
- and
- (c) a blowing agent composition comprising:
- (1) water;
- and
- (2) a hydrofluoroolefin, wherein
- the hydrofluoroolefin is present in an amount of 1 to 6% by weight, based on total weight of the isocyanate-reactive composition, and
- the hydrofluoroolefin and water are present in the isocyanate-reactive composition in a relative ratio, by weight, of 4:1 to 8:1.
6 more elements
Dependencies are inferred from the claim text.