Back to results
US 9,758,614 B2Granted
Polyester polyol and polyol blends and rigid polyurethane foam manufacturing
AssigneeDow Global Technologies LLC
InventorsJorge Jimenez, Guiseppe Lista, Davide Micheletti
Life of this patent
Estimating the term…
Abstract
A polyester polyol is formed in a polycondensation reaction between an aromatic dicarboxylic acid, a polyol, and an epoxy compound having a straight chain alkyl or alkenyl group having at least six carbon atoms. The polyester polyol exhibits excellent compatibility with hydrocarbon blowing agents. As such, it is a useful component in rigid polyurethane foam formulations that are contain hydrocarbon blowing agents.
Claims10
A polyol blend comprising
- a) at least 40% by weight, based on the combined weights of all polyols in the polyol blend, of a polyether polyol having a hydroxyl functionality of greater than four and a hydroxyl equivalent weight of up to 250;
- b) at least 10% by weight, based on the combined weights of all polyols in the polyol blend, of at least one polyether polyol having a hydroxyl functionality of 2 to 4 and a hydroxyl equivalent weight of up to 700;
- and
- c) 8 to 30% by weight, based on the combined weights of all polyols in the polyol blend, of a polyester polyol formed by polycondensation of
- (i) at least aromatic dicarboxylic acid, aromatic dicarboxylic anhydride or aromatic dicarboxylic acid diester;
- (ii) a polyol having at least two hydroxyl groups per molecule, or a mixture of two or more such polyols;
- and
- (iii) an epoxy compound having at least one oxirane group and at least one straight chain alkyl or alkenyl group having at least six carbon atoms;
- until the carboxylic acid, anhydride or ester groups and the oxirane groups are essentially consumed, to produce a polyester polyol having an average hydroxyl functionality of at least 2 hydroxyl groups per molecule, a hydroxyl equivalent weight of 100 to 2000 and at least one straight chain alkyl or alkenyl group having at least six carbon atoms corresponding to the at least one straight chain alkyl or alkenyl group of the epoxy compound, wherein the polycondensation is performed in a two-step process by first reacting components (i) and (iii) such that only a portion of the carboxylic acid, anhydride or ester groups of component (i) are consumed to form a compound having an ester-containing intermediate containing an ester group and a new hydroxyl group, and then reacting the ester-containing intermediate with component (ii).
6 more elements
A polyol blend comprising
- a) at least 40% by weight, based on the combined weights of all polyols in the polyol blend, of a polyether polyol having a hydroxyl functionality of greater than four and a hydroxyl equivalent weight of up to 250;
- b) at least 10% by weight, based on the combined weights of all polyols in the polyol blend, of at least one polyether polyol having a hydroxyl functionality of 2 to 4 and a hydroxyl equivalent weight of up to 700;
- and
- c) 8 to 30% by weight, based on the combined weights of all polyols in the polyol blend, of a polyester polyol formed by polycondensation of
- (i) at least aromatic dicarboxylic acid, aromatic dicarboxylic anhydride or aromatic dicarboxylic acid diester;
- (ii) a polyol having at least two hydroxyl groups per molecule, or a mixture of two or more such polyols;
- and
- (iii) a glycidyl ether of a straight-chain alkanol having at least six carbon atoms;
- until the carboxylic acid, anhydride or ester groups and the oxirane groups of the glycidyl ether are essentially consumed, to produce a polyester polyol having an average hydroxyl functionality of at least 2 hydroxyl groups per molecule, a hydroxyl equivalent weight of 100 to 2000 and at least one straight chain alkyl group having at least six carbon atoms corresponding to the group based on a straight-chain alkanol group having at least six carbon atoms of the glycidyl ether.
6 more elements
A formulated polyol composition comprising 75 to 90% by weight of a polyol blend and 10 to 25% by weight of a hydrocarbon blowing agent, the weight percentages being based on the combined weight of the polyols in the formulated polyol composition and the hydrocarbon blowing agent;
- wherein the polyol blend comprises:
- a) at least 40% by weight, based on the combined weights of all polyols in the polyol blend, of a polyether polyol having a hydroxyl functionality of greater than four and a hydroxyl equivalent weight of up to 250;
- b) at least 10% by weight, based on the combined weights of all polyols in the polyol blend, of at least one polyether polyol having a hydroxyl functionality of 2 to 4 and a hydroxyl equivalent weight of up to 700;
- and
- c) 8 to 30% by weight, based on the combined weights of all polyols in the polyol blend, of a polyester polyol formed by polycondensation of
- (i) at least aromatic dicarboxylic acid, aromatic dicarboxylic anhydride or aromatic dicarboxylic acid diester;
- (ii) a polyol having at least two hydroxyl groups per molecule, or a mixture of two or more such polyols;
- and
- (iii) an epoxy compound having at least one oxirane group and at least one straight chain alkyl or alkenyl group having at least six carbon atoms;
- until the carboxylic acid, anhydride or ester groups and the oxirane groups are essentially consumed, to produce a polyester polyol having an average hydroxyl functionality of at least 2 hydroxyl groups per molecule, a hydroxyl equivalent weight of 100 to 2000 and at least one straight chain alkyl or alkenyl group having at least six carbon atoms corresponding to the at least one straight chain alkyl or alkenyl group of the epoxy compound.
7 more elements
Dependencies are inferred from the claim text.