Hydrocarbon blown polyurethane foam formulation giving desirable thermal insulation properties

An insulating foam prepared from a composition comprising:

• an organic polyisocyanate;
• at least about 20% by weight of an aromatic polyester polyol, based on the total weight of the composition;
• a hydrocarbon blowing agent;
• a salt selected from the group consisting of a carboxylate salt of an alkali metal, a carboxylate salt of an alkaline earth metal, a carboxylate salt of a quaternary ammonium compound, and combinations thereof;
• and
• at least about 4.0 millimoles per 100 grams of the foam to 9.46 millimoles per 100 grams of the foam of a tertiary amine, wherein the tertiary amine is selected from the group consisting of a trialkylamine, an alkyl amine, an alkylaryl amine, an aliphatic polyamine, diazabicyclooctane, 1,4-ethylene piperidine, N-methylimidazole, 1,2-dimethylimidazole, 1,8-diazabicyclo(5,4,0)undecene-7, an ether amine, a saturated heterocyclic amine, and a combination thereof wherein and the composition has an isocyanate index of about 200 to 500, the molar ratio of the salt to the tertiary amine is less than about 1.0 and wherein the insulating foam has a ratio of thermal conductivity at 75° F. to thermal conductivity at 25° F. between about 0.98 and about 1.10.

A laminate comprising an insulating foam obtained from the reaction of a composition comprising:

• an organic polyisocyanate;
• an isocyanate reactive material containing at least about 20% by weight, based on the total weight of the composition, of an aromatic polyester polyol;
• a hydrocarbon blowing agent;
• a first catalyst selected from the group consisting of a carboxylate salt of an alkali metal, a carboxylate salt of an alkaline earth metal, a carboxylate salt of a quaternary ammonium compound, and combinations thereof;
• and
• a second catalyst comprising a tertiary amine, wherein the tertiary amine is selected from the group consisting of a trialkylamine, an alkyl amine, an alkylaryl amine, an aliphatic polyamine, a cyclic amine, an ether amine, a saturated heterocyclic amine and a combination thereof
• and wherein a molar ratio of the first catalyst to the second catalyst is less than about 1.0, the second catalyst is present in the composition in an amount of at least 4.0 millimoles per 100 grams of the composition to 9.46 millimoles per 100 grams of the composition, and the insulating foam has a ratio of thermal conductivity at 75° F. to thermal conductivity at 25° F. between about 0.98 and about 1.10.