Rigid polyurethane foams suitable for use as panel insulation
AssigneeCovestro LLC
InventorsShawn G. Rider, Brandon W. Parks, Carson C. Miller
Life of this patent
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Abstract
Disclosed are polyurethane-foam forming compositions, rigid polyurethane foams and methods for their production, as well as to composite articles comprising such foams sandwiched between facer substrates, including use of such composite elements for floor insulating elements for refrigerated tractor trailers. The rigid polyurethane foams are produced from an isocyanate-reactive composition comprising: (1) a polyol blend; (2) a hydrochlorofluoroolefin; and (3) a tertiary amine catalyst composition.
Claims20
An isocyanate-reactive composition comprising:
- (a) a polyol blend comprising:
- (1) 30 to 98% by weight, based on the total weight of the polyol blend, of a saccharide-initiated polyether polyol having an OH number of 200 to 600 mg KOH/g and a functionality of 4 to 6,
- (2) 1 to 40% by weight, based on the total weight of the polyol blend, of a polyalkylene oxide glycol having a functionality of 1.9 to 2.0 and an OH number of 20 to 120 mg KOH/g;
- (3) 1 to 20% by weight, based on the total weight of the polyol blend, of an alkanolamine-initiated polyether polyol having an OH number of at least 500 mg KOH/g and a functionality of 2.5 to 4;
- (b) a blowing agent composition comprising:
- (1) a hydrochlorofluoroolefin;
- and
- (2) a carbon dioxide generating chemical blowing agent;
- and
- (c) a tertiary amine catalyst composition.
A composite article comprising a rigid polyurethane foam sandwiched between facer substrates, wherein the rigid polyurethane foam comprises the reaction product of a reaction mixture comprising (a) a polyisocyanate, (b) a polyol blend, (c) a blowing agent composition comprising:
- (1) a hydrochlorofluoroolefin;
- and (2) a carbon dioxide generating chemical blowing agent;
- and (d) a tertiary amine catalyst composition, wherein the polyol blend comprises:
- (1) 40 to 98% by weight, based on the total weight of the polyol blend, of a saccharide-initiated polyether polyol having an OH number of 200 to 600 mg KOH/g and a functionality of 4 to 6;
- (2) 1 to 40% by weight, based on the total weight of the polyol blend, of a polyalkylene oxide glycol having a functionality of 1.9 to 2.0 and an OH number of 20 to 120 mg KOH/g;
- and
- (3) 1 to 20% by weight, based on the total weight of the polyol blend, of an alkanolamine-initiated polyether polyol having an OH number of at least 500 mg KOH/g and a functionality of 2.5 to 4.
A rigid polyurethane foam-forming composition comprising:
- (a) a polyisocyanate;
- (b) a polyol blend comprising:
- (1) 40 to 98% by weight, based on the total weight of the polyol blend, of a saccharide-initiated polyether polyol having an OH number of 200 to 600 mg KOH/g and a functionality of 4 to 6, or
- (2) 1 to 40% by weight, based on the total weight of the polyol blend, of a polyalkylene oxide glycol having a functionality of 1.9 to 2.0 and an OH number of 20 to 120 mg KOH/g;
- and
- (3) 1 to 20% by weight, based on the total weight of the polyol blend, of an alkanolamine-initiated polyether polyol having an OH number of at least 500 mg KOH/g and a functionality of 2.5 to 4;
- (c) a blowing agent composition comprising:
- (1) a hydrochlorofluoroolefin;
- and
- (2) a carbon dioxide generating chemical blowing agent;
- and
- (d) a tertiary amine catalyst composition.
Dependencies are inferred from the claim text.