Novel aromatic polyester polyol mixtures made from polyethylene terephthalate residues and alkylene oxides
AssigneeTexaco Inc.
InventorMichael E. Brennan
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Abstract
Mixtures of aromatic polyols containing ester functionalities suitable for use in rigid polyurethane and polyisocyanurate foams are described. The mixtures are prepared by reacting a polyethylene terephthalate (PET) residue with an alkylene oxide in the presence of a basic catalyst. These novel polyol mixtures may be blended with conventional polyols to yield rigid foams with better flammability resistance as compared with foams made from conventional polyols alone.
Claims18
A mixture of aromatic polyols having ester functionalities for use in preparing rigid foams, being produced by the process comprising reacting a polyethylene terephthalate residue containing ester functionalities with an alkylene oxide in the presence of a basic catalyst to give an aromatic polyester polyol.
A method for making a mixture of aromatic polyols having ester functionalities for use in preparing rigid foams comprising reacting a polyethylene terephthalate residue containing ester and hydroxyl functionalities with an alkylene oxide in the presence of a basic catalyst.
A rigid polyurethane foam obtained by reacting in the presence of a blowing agent and a catalyst of polyurethane formation, an organic polyisocyanate and a polyol blend comprising
- a. from about 5 to 100 percent by weight of a mixture of aromatic polyols having ester functionalities which is produced by reacting a polyethylene terephthalate residue containing ester functionalities with an alkylene oxide in the presence of a basic catalyst and
- b. from about 95 to 0 percent by weight of a nitrogen-containing polyol which is the reaction product from
- (1) reacting one mole of phenol or nonylphenol with one to two moles of diethanolamine to give a Mannich reaction product, and
- (2) subsequently reacting one mole of the Mannich reaction product with two to three moles of propylene oxide.
A rigid isocyanurate foam which is obtained by reacting in the presence of a blowing agent and a trimerization catalyst of polyisocyanurate formation, an organic polyisocyanate and a mixture of aromatic polyols having ester functionalities which is made by reacting a polyethylene terephthalate residue with an alkylene oxide in the presence of a basic catalyst.
Dependencies are inferred from the claim text.