US4485196A
Expired / Lapsed
US
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Liquid phase polyols which are alkylene oxide adducts of terephthalic esters from recycled polyethylene terephthalate
Assignee: Cook Composites and Polymers Co
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Filing: 1983-09-26
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Granted: 1984-11-27
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Expires: 2003-09-26
Abstract
Abstract A mixture of aromatic polyester polyols useful in preparing rigid foams is described. The polyols are made by first reacting recycled polyethylene terephthalate (PET) scrap with an alkylene glycol to form a reaction product which is then reacted with an alkylene oxide, such as propylene oxide. The resultant mixture of aromatic polyester polyols is a homogeneous liquid which does not precipitate solids upon standing, as do some prior art PET-derived polyols.
Inventors
- 👤 George P. Speranza
- 👤 Robert A. Grigsby, Jr.
- 👤 Michael E. Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:48
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4211; C08G18/4213; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/18; C08J11/22; C08J11/24; C08J2367/00; C08J2367/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
56 words
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.
Claim 2
Dependent Claim
56 words
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.
Claim 3
Dependent Claim
34 words
The mixture of claim 1 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 4
Dependent Claim
28 words
The mixture of claim 1 in which the alkylene glycol is selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol and mixtures thereof.
Claim 5
Dependent Claim
24 words
The mixture of claim 1 in which the step b. reaction is conducted at a temperature in the range of 90° to 160° C.
Claim 6
Dependent Claim
26 words
The mixture of claim 1 in which the alkylene oxide is selected from the group consisting of ethylene oxide, propylene oxide, 1,2-butylene oxide and mixtures thereof.
Claim 7
Dependent Claim
13 words
The mixture of claim 1 in which the alkylene oxide is propylene oxide.
Claim 8
Dependent Claim
39 words
The mixture of claim 1 in which the catalyst in step b. is selected from the group consisting of acid catalysts and basic catalysts in turn selected from the group consisting of sodium hydroxide, potassium hydroxide and amine catalysts.
Claim 9
Dependent Claim
20 words
A mixture of claim 1 in which the average hydroxyl number of the resultant mixture is between 100 and 500.
Claim 10
Dependent Claim
35 words
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 comprising the mixture of aromatic polyols of claim 1.
Claim 11
Dependent Claim
33 words
A rigid polyisocyanurate foam obtained by reacting in the presence of a blowing agent and a trimerization catalyst of polyisocyanurate formation, an organic polyisocyanate and the mixture of aromatic polyols of claim 1.
Claim 12
Dependent Claim
73 words
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.
Claim 13
Dependent Claim
73 words
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.
Claim 14
Dependent Claim
54 words
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.
Claim 15
Dependent Claim
54 words
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.
Claim 16
Dependent Claim
34 words
The process of claim 12 in which the alkylene glycol has the formula ##STR6## where R is hydrogen or lower alkyl of 1 to 4 carbon atoms and n is from 1 to 3.
Claim 17
Dependent Claim
28 words
The process of claim 12 in which the alkylene glycol is selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol and mixtures thereof.
Claim 18
Dependent Claim
24 words
The process of claim 12 in which the step b. reaction is conducted at a temperature in the range of 90° to 160° C.
Claim 19
Dependent Claim
24 words
The process of claim 12 in which the alkylene oxide is selected from the group consisting of ethylene oxide, propylene oxide and 1,2-butylene oxide.
Claim 20
Dependent Claim
13 words
The process of claim 12 in which the alkylene oxide is propylene oxide.
Claim 21
Dependent Claim
39 words
The process of claim 12 in which the catalyst in step b. is selected from the group consisting of acid catalysts and basic catalysts in turn selected from the group consisting of sodium hydroxide, potassium hydroxide and amine catalysts.
Claim 22
Dependent Claim
20 words
The process of claim 12 in which the average hydroxyl number of the resultant mixture is between 100 and 500.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |