US4506090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polyols made from polyethylene terephthalate scrap, glycols and aromatic carbonyl-containing compounds
Assignee: Dow Chemical Co
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Filing: 1983-07-15
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Granted: 1985-03-19
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Expires: 2003-07-15
Abstract
Abstract Mixtures of aromatic polyols containing ester functionalities suitable for use as polyol extenders in rigid foams prepared by reacting aromatic carbonyl-containing compounds with an alkylene glycol, the reaction product of which is reacted with recycled polyethylene terephthalate are described. Surprisingly, the process is non-catalytic. These novel polyols may be blended with conventional polyols to yield excellent rigid foams, thus serving as useful polyol extenders.
Inventors
- 👤 Michael E. Brennan
- 👤 George P. Speranza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:01
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4211; C08G18/4213; C08G18/4244; C08G18/4247; C08G18/425
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
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° and 250° 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.
Claim 2
Dependent Claim
119 words
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° and 250° 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.
Claim 3
Dependent Claim
17 words
The mixture of aromatic polyols of claim 1 in which the aromatic carbonyl-containing compound is phthalic anhydride.
Claim 4
Dependent Claim
37 words
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.
Claim 5
Dependent Claim
16 words
The mixture of aromatic polyols of claim 3 in which the alkylene glycol is diethylene glycol.
Claim 6
Dependent Claim
140 words
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° and 250° 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.
Claim 7
Dependent Claim
140 words
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° and 250° 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.
Claim 8
Dependent Claim
24 words
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.
Claim 9
Independent Claim
114 words
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° and 250° 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.
Claim 10
Independent Claim
114 words
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° and 250° 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.
Claim 11
Dependent Claim
14 words
The method of claim 7 in which the aromatic carbonyl-containing compound is phthalic anhydride.
Claim 12
Dependent Claim
34 words
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.
Claim 13
Dependent Claim
13 words
The method of claim 9 in which the alkylene glycol is diethylene glycol.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |