Low viscosity aromatic polyols and methods for their preparation
AssigneeChardonol, Division of Freeman Corporation
InventorsMilton J. Altenberg, Johannes deJong
Life of this patent
Estimating the term…
Abstract
A method for preparing aromatic polyols useful for the production of polyurethane and polyisocyanurate polymers involves digesting scrap polyalkylene terephthalate polymers with a digesting agent, typically a low molecular weight polyol. The digestion product is then treated with an alkylene oxide to produce a low viscosity polyol which displays excellent stability over long term storage.
Claims57
A method for preparing polyester-polyether polyols from polyalkylene terephthalates, which polyols are suitable for the production of polyurethanes, said method comprising:
- reacting the polyalkylene terephthalate with low molecular weight polyol or polyamine solvent at a temperature of about 180.degree. to about 230.degree. C. to form a polyester reaction product;
- and
- reacting the said reaction product with about 1 to about 20 molar equivalents, based on said polyalkylene terephthalate of an alkylene oxide containing 1 to 6 carbon atoms to introduce ether functionalities into the polyester molecules.
A polyester-polyether polyol suitable for the production of polyurethanes, said polyol being produced by
- reacting a polyalkylene terephthalate with a low molecular weight polyol or polyamine solvent to form a polyester reaction product;
- and
- reacting the said reaction product with about 1 to about 20 molar equivalents, based on said polyalkylene terephthalate of an alkylene oxide containing 1 to 6 carbon atoms to introduce ether functionalities into the polyester molecule.
A method for preparing a polyester-polyether polyol from a polyalkylene terephthalate, which polyol is suitable for the production of a polyurethane, said method comprising:
- reacting the polyalkylene terephthalate with a bi-functional compound selected from the group consisting of ethanolamine, dimethanolamine, methanolethanolamine, diethanolamine and propanolamine at a temperature of about 180.degree. to about 230.degree. C. to form a polyester reacting product;
- and
- reacting the said reaction product with about 1 to about 20 molar equivalents, based on said polyalkylene terephthalate of an alkylene oxide containing 1 to 6 carbon atoms to introduce ether functionalities into the digestion product.
A method for preparing a polyester-polyether polyol from a polyethylene terephthalate which comprises the steps of:
- reacting said polyethylene terephthalate with diethylene glycol at a temperature of about 180.degree. to about 230.degree. C. to form a polyester digestion product;
- and
- reacting the said reaction product with about 1 to about 20 molar equivalents, based on said polyethylene terephthalate, of an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide to introduce ether functionalities into the polyester molecule.
A method for preparing a polyester-polyether polyol from a polyethylene terephthalate suitable for the production of a polyurethane, said method comprising:
- reacting said polyethylene terephthalate with a bi-functional compound selected from the group consisting of ethanolamine, dimethanolamine, methanolethanolamine, diethanolamine and propanolamine at a temperature of about 180.degree. to about 230.degree. C. to form a polyester reaction product;
- and
- reacting the said reaction product with about 1 to about 20 molar equivalents, based on said polyethylene terephthalate of an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide to introduce ether functionalities into the polyester molecule.
A method for preparing a polyester-polyether glycol from a polyethylene terephthalate, which polyol is suitable for the production of a polyurethane, said method comprising:
- reacting the polyethylene terephthalate with diethylene glycol under reaction conditions including a temperature within the range of about 180.degree. to about 230.degree. C. and a molar ratio of diethylene glycol to polyethylene terephthalate of about 1:1 to form a polyethylene terephthalate reaction product;
- reacting methyl glucoside with said polyethylene terephthalate reaction product in an equivalent weight ratio of from 0.1 to 3, based on the weight of the polyethylene terephthalate, to form an intermediate reaction product;
- and
- reacting about 1 to 20 molar equivalents, based on said polyethylene terephthalate, of an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide with said intermediate reaction product under basic conditions to introduce either functionalities into the molecules.
A polyester-polyether polyol useful for the production of a polyurethane, said polyol having being produced by:
- reacting the polyalkylene terephthalate with a bi-functional compound selected from the group consisting of ethanolamine, dimethanolamine, methanolethanolamine, diethanolamine and propanolamine at a temperature of about 180.degree. to about 230.degree. C. to form a polyester reaction product;
- and
- reacting the said reaction product with about 1 to about 20 molar equivalents, based on said polyalkylene terephthalate of an alkylene oxide containing 1 to 6 carbon atoms to introduce ether functionalities into the digestion product.
A polyester-polyether polyol useful for the production of polyurethanes, said polyol having been produced by:
- reacting a polyethylene terephthalate with diethylene glycol at a temperature of from about 180.degree. to about 230.degree. C. to form a polyester digestion product;
- and
- reacting the said reaction product with about 1 to about 20 molar equivalents, based on said polyethylene terephthalate, of an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide to introduce ether functionalities into the polyester molecule.
A polyester-polyether polyol useful for the production of a polyurethane, said polyol having been produced by:
- reacting a polyethylene terephthalate with a bi-functional compound selected from the group consisting of ethanolamine, dimethanolamine, methanol-ethanolamine, diethanolamine and propanolamine at a temperature of about 180.degree. to about 230.degree. C. to form a polyester reaction product;
- and
- reacting the said reaction product with about 1 to about 20 molar equivalents, based on said polyethylene terephthalate of an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide to introduce ether functionalities into the molecule.
A polyester-polyether polyol useful for the production of a polyurethane, said polyol having been produced by:
- reacting a polyethylene terephthalate with diethylene glycol under reaction conditions including a temperature within the range of about 180.degree. to about 230.degree. C. and a molar ratio of diethylene glycol to polyethylene terephthalate of about 1:1 to form a polyethylene terephthalate reaction product;
- reacting methyl glucoside with said polyethylene terephthalate reaction product in an equivalent weight ratio of from 0.1 to 3, based on the weight of the polyethylene terephthalate, to form an intermediate reaction product;
- and
- reacting about 1 to 20 molar equivalents, based on said polyethylene terephthalate, of an alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide and said intermediate reaction product under basic conditions to introduce ether functionalities into the molecules.
A mixture of aromatic polyols having hydroxyl and ester functionalities for use in preparing rigid foams, being produced by the process comprising
- a. reacting recycled polyethylene terephthalate with an alkylene glycol to form a reaction product and
- b. subsequently reacting the reaction product of step a. with an alkylene oxide in the presence of a catalyst.
A mixture of aromatic polyols having hydroxyl and ester functionalities for use in preparing rigid foams, being produced by the process comprising
- a. reacting recycled polyethylene terephthalate with an alkylene glycol selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol and dipropylene glycol and mixtures thereof, to form a reaction product and
- b. subsequently reacting the reaction product of step a. with propylene oxide in the presence of a catalyst.
A process for the production of aromatic polyols having hydroxyl and ester functionalities for use in preparing rigid foams, comprising
- a. reacting recycled polyethylene terephthalate with an alkylene glycol to form a reaction product and
- b. subsequently reacting the reaction product of step a. with an alkylene oxide in the presence of a catalyst.
Dependencies are inferred from the claim text.