Pentane compatible polyester polyols
AssigneeStepan Company
InventorsF. Leo Hickey, Kevin L. Rooney
Life of this patent
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Abstract
Disclosed are aromatic polyester polyols, polyol based resin blends, and rigid closed-cell polyisocyanate-based foams made using the polyol based resin blends. The resin blends generally comprise: (a) an aromatic polyester polyol reaction product formed by inter-esterification of a phthalic acid based material; a hydroxylated material having a functionality of at least 2; and a hydrophobic material; and (b) a C4-C7 hydrocarbon blowing agent. Also disclosed is a method for preparing rigid closed-cell polyisocyanate-based foams comprising reacting a polyisocyanate and a polyol based resin blend.
Claims16
A polyol based resin blend comprising:
- (a) a polyol component comprising:
- (I) from about 20 to about 100 percent by weight of an aromatic polyester polyol reaction product tormed by inter-esterification of:
- (i) from about 10 to about 70 percent by weight of a phthalic acid based material;
- (ii) from about 20 to about 60 percent by weight of a hydroxylated material having a functionality of at least 2;
- and
- (iii) from about 1 to 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 totaling at least 4 carbon atoms for each radical present;
- and
- (3) an average molecular weight of from about 100 to about 1000;
- wherein the hydrophobic material is substantially free of diner acid;
- and
- (II) from 0 to about 80 percent by weight of a polyether polyol;
- and
- (b) from about 10 to about 35 parts per hundred parts of polyol of a C4-C7 hydrocarbon blowing agent.
A method for preparing a rigid closed-cell polyisocyanate-based foam, comprising reacting a polyisocyanate and a polyol based resin blend, wherein the polyol based resin blend comprises:
- (a) a polyol component comprising:
- (I) from about 20 to about 100 percent by weight of an aromatic polyester polyol reaction product formed by inter-esterification of:
- (i) from about 10 to about 70 percent by weight of a phthalic acid based material;
- (ii) from about 20 to about 60 percent by weight of a hydroxylated material having a functionality of at least 2;
- and
- (iii) from about 1 to 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 totaling at least 4 carbon atoms for each radical present;
- and
- (3) an average molecular weight of from about 100 to about 1000;
- wherein the hydrophobic material is substantially free of dimer acid;
- and
- (II) from 0 to about 80 percent by weight of a polyether polyol;
- and
- (b) from about 10 to about 35 parts per hundred parts of polyol of a C4-C7 hydrocarbon blowing agent.
Dependencies are inferred from the claim text.