Polyol blends for producing hydrocarbon-blown polyurethane and polyisocyanurate foams
AssigneeStepan Company
InventorF. Leo Hickey
Life of this patent
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Abstract
Disclosed are aromatic polyester polyols, polyester polyol resin blends, methods for preparing such compositions and polyurethane and polyisocyanurate foams made using the compositions, wherein the resin blends generally comprise: (a) an aromatic polyester polyol formed by a reaction between a phthalic acid based material; a hydroxylated material having a functionality of at least 2; and a hydrophobic material; (b) a nonionic surfactant; and (c) a C.sub.4 -C.sub.7 hydrocarbon blowing agent.
Claims14
A polyester polyol based resin blend comprising:
- (a) an aromatic polyester polyol formed by an inter-esterification reaction between
- (i) a phthalic acid based material;
- (ii) a hydroxylated material having a functionality of at least 2;
- and
- (iii) less than about 40 percent by weight of a hydrophobic material having:
- (1) from one to six radicals, the radicals being selected from the group consisting of carboxylic acid groups, carboxylic acid ester groups, hydroxyl groups, and mixtures thereof;
- (2) hydrocarbon groups comprising a total of at least 4 carbon atoms for each radical present in the hydrophobic material;
- and
- (3) an average molecular weight of from about 100 to 1000;
- and
- (b) a nonionic surfactant;
- and
- (c) from 14 to about 35 parts per hundred parts of all polyols of a C.sub.4 -C.sub.7 hydrocarbon blowing agent.
A method for preparing a rigid closed cell polyisocyanate-based foam, comprising reacting an organic aromatic polyisocyanate and a polyol in the presence of a nonionic surfactant and from 14 to about 35 parts per hundred parts of all polyols of a C.sub.4 -C.sub.7 aliphatic or cycloaliphatic hydrocarbon blowing agent, where the polyol resin blend comprises an aromatic polyester polyol formed by an inter-esterification reaction between (i) a phthalic acid based material;
- (ii) a hydroxylated material having a functionality of at least 2;
- and (iii) less than 40% by weight of a hydrophobic material having
- (1) from one to six radicals, the radicals being selected from the group consisting of carboxylic acid groups, carboxylic acid ester groups, hydroxyl groups, and mixtures thereof;
- and
- (2) hydrocarbon groups comprising a total of at least 4 carbon atoms for each radical present in the hydrophobic material;
- and
- (3) an average molecular weight of from about 100 to 1000.
Dependencies are inferred from the claim text.