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US 11,732,100 B2Granted
Polyol premixes, thermally insulating rigid polyurethane foams and methods for their production
AssigneeCovestro LLC
InventorsRick L. Adkins, Brandon W. Parks, Steve L. Aprahamian, Carson C. Miller, Emily E. Connor
Life of this patent
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Abstract
Polyol premixes and thermally insulating rigid polyurethane foams, such as those that can be used as a thermal insulation medium in the construction of refrigerated storage devices, are disclosed. A polymer polyol having a OH number of greater than 260 mg KOH/g is utilized. The resulting polyurethane foams can exhibit improved thermal insulation properties without sacrificing other important physical and processing properties.
Claims20
A rigid polyurethane foam comprising the reaction product of a reaction mixture comprising:
- (a) a polyisocyanate;
- (b) a polyol composition comprising at least 30% by weight, based on the total weight of the polyol composition, of a polymer polyol having an OH number of greater than 260 mg KOH/g;
- (c) a catalyst;
- (d) a physical blowing agent composition comprising at least 50% by weight, based on the total weight of the physical blowing agent composition, of a hydrocarbon;
- and
- (e) a carbon dioxide generating chemical blowing agent,
- wherein the rigid polyurethane foam has a closed-cell content of more than 80%, measured according to ASTM D6226-15.
4 more elements
Dependencies are inferred from the claim text.