Patent US4506090A successfully refreshed from Google Patents.
US4506090A
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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 07:05
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.
References Cited (Backward Citations)
US3647759A
Cited
US3755212A
Cited
US3892796A
Cited
US4039487A
Cited
US4048104A
Cited
US4246365A
Cited
US4092276A
Cited
US4223068A
Cited
US4237238A
Cited
US4435592A
Cited
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 |