Claims
- 1. A mixture of aromatic polyols having hydroxyl and ester functionalities for use in preparing polyurethane foams, being produced by the process comprising
- a. reacting an aromatic carbonyl-containing compound selected from the group consisting of aromatic dicarboxylic acids, aromatic esters and aromatic anhydrides, with an alkylene glycol, in the absence of a catalyst, to form a precondensate and
- b. transesterifying recycled polyethylene terephthalate with the precondensate at a temperature between 200.degree. and 250.degree. C. in the absence of a catalyst
- where the mole ratios of aromatic carbonyl-containing compound to alkylene glycol to recycled polyethylene terephthalate fall within the range of about 1.0:2.0-5.0:1.0, respectively, and the resultant mixture of aromatic polyols has an average hydroxyl number of between 100 and 400.
- 2. The mixture of aromatic polyols of claim 1 in which the aromatic carbonyl-containing compound is phthalic anhydride.
- 3. The mixture of aromatic polyols of claim 1 in which the alkylene glycol has the formula ##STR3## where R is hydrogen or lower alkyl of 1 to 4 carbon atoms and n is from 1 to 3.
- 4. The mixture of aromatic polyols of claim 3 in which the alkylene glycol is diethylene glycol.
- 5. A mixture of aromatic polyols having hydroxyl and ester functionalities for use in preparing polyurethane foams, being produced by the process comprising
- a. reacting an aromatic carbonyl-containing compound selected from the group consisting of aromatic dicarboxylic acids, aromatic esters and aromatic anhydrides, with an alkylene glycol having the formula ##STR4## where R is hydrogen or lower alkyl of 1 to 4 carbon atoms and n is from 1 to 3, in the absence of a catalyst to form a precondensate,
- b. transesterifying recycled polyethylene terephthalate with the precondensate at a temperature between 200.degree. and 250.degree. C. in the absence of a catalyst where the mole ratios of aromatic carbonyl-containing compound to alkylene glycol to recycled polyethylene terephthalate fall within the range of 1.0:2.0-4.0:1.0 and the resultant mixture of aromatic polyols has an average hydroxyl number of between 100 and 400.
- 6. The mixture of aromatic polyols of claim 5 in which the aromatic carbonyl-containing compound is phthalic anhydride and the alkylene glycol is diethylene glycol.
- 7. A method for the production of a mixture of aromatic polyols having hydroxyl and ester functionalities comprising
- a. reacting an aromatic carbonyl-containing compound selected from the group consisting of aromatic dicarboxylic acids, aromatic esters and aromatic anhydrides, with an alkylene glycol, in the absence of a catalyst, to form a precondensate and
- b. transesterifying recycled polyethylene terephthalate with the precondensate at a temperature between 200.degree. and 250.degree. C. in the absence of a catalyst
- where the mole ratio of aromatic carbonyl-containing compound to alkylene glycol to recycled polyethylene terephthalate fall within the range of about 1.0:2.0-5.0:1.0, respectively, and the resultant mixture of aromatic polyols has an average hydroxyl number of between 100 and 400.
- 8. The method of claim 7 in which the aromatic carbonyl-containing compound is phthalic anhydride.
- 9. The method of claim 7 in which the alkylene glycol has the formula ##STR5## where R is hydrogen or lower alkyl of 1 to 4 carbon atoms and n is from 1 to 3.
- 10. The method of claim 9 in which the alkylene glycol is diethylene glycol.
CROSS-REFERENCE TO RELATED APPLICATION
This application is related to U.S. Pat. No. 4,439,550 issued on Mar. 27, 1984, which relates to polyol production from the reaction of polyethylene terephthalate scrap with the reaction product of dibasic acid waste streams and alkylene glycol residues.
US Referenced Citations (10)