Patent US4379327A successfully refreshed from Google Patents.
US4469823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible polyurethane foams made using an aromatic polyester polyol
Assignee: Dow Chemical Co
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Filing: 1983-07-28
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Granted: 1984-09-04
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Expires: 2003-07-28
Abstract
Abstract A method for producing a flexible polyurethane foam from reacting a polyol blend with a polyisocyanate in the presence of a polyurethane formation catalyst is described. The polyol blend contains from 0.5 to 10 wt. % of an aromatic polyester polyol extender typically used in rigid foams. The polyol extender is made from dibasic acids, alkylene glycols and recycled polyethylene terephthalate. Commercial extenders cause flexible foams to shrink, a problem not found in the foams of this invention.
Inventors
- 👤 Ernest L. Yeakey
- 👤 Robert L. Zimmerman
- 👤 Michael E. Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:37
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4211; C08G18/4216; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0083
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
120 words
A method for producing a flexible polyurethane foam comprising reacting in the presence of a polyurethane catalyst an organic polyisocyanate and a polyol blend having an average hydroxyl number in the range from about 25 to 100 where the polyol blend comprises a. from about 90 to 99.5 wt.% of a polyester polyol or polyether polyol and b. from about 0.5 to 10 wt.% of an aromatic polyester polyol which is the reaction product from (1) esterifying, in the absence of a catalyst, a residue from dibasic acid manufacture with an alkylene glycol to produce a polyester polyol intermediate, and (2) transesterifying, in the absence of a catalyst, recycled polyethylene terephthalate with the polyester polyol intermediate of the previous step.
Claim 2
Independent Claim
120 words
A method for producing a flexible polyurethane foam comprising reacting in the presence of a polyurethane catalyst an organic polyisocyanate and a polyol blend having an average hydroxyl number in the range from about 25 to 100 where the polyol blend comprises a. from about 90 to 99.5 wt.% of a polyester polyol or polyether polyol and b. from about 0.5 to 10 wt.% of an aromatic polyester polyol which is the reaction product from (1) esterifying, in the absence of a catalyst, a residue from dibasic acid manufacture with an alkylene glycol to produce a polyester polyol intermediate, and (2) transesterifying, in the absence of a catalyst, recycled polyethylene terephthalate with the polyester polyol intermediate of the previous step.
Claim 3
Dependent Claim
29 words
The method of claim 1 in which the aromatic polyester polyol has a structure of the following formula ##STR5## where x is an integer of from 2 to 4.
Claim 4
Dependent Claim
21 words
The method of claim 1 in which the catalyst is a tertiary amine compound and the polyisocyanate is an aromatic diisocyanate.
Claim 5
Independent Claim
153 words
A method for producing a non-shrinking flexible polyurethane foam comprising reacting in the presence of a polyurethane catalyst an organic polyisocyanate and a polyol blend having an average hydroxyl number in the range from about 25 to 100 where the polyol blend comprises a. from about 90 to 99.5 wt.% of a polyester polyol or a polyether polyol having a hydroxyl number in the range from 25 to 60 and a molecular weight in the range from 2,000 to 6,000, and b. from about 0.5 to 10 wt.% of an aromatic polyester polyol having a hydroxyl number of from 50 to 250 which is the reaction product from (1) esterifying, in the absence of a catalyst, a residue from dibasic acid manufacture with an alkylene glycol to produce a polyester polyol intermediate, and (2) transesterifying, in the absence of a catalyst, recycled polyethylene terephthalate with the polyester polyol intermediate of the previous step.
Claim 6
Independent Claim
153 words
A method for producing a non-shrinking flexible polyurethane foam comprising reacting in the presence of a polyurethane catalyst an organic polyisocyanate and a polyol blend having an average hydroxyl number in the range from about 25 to 100 where the polyol blend comprises a. from about 90 to 99.5 wt.% of a polyester polyol or a polyether polyol having a hydroxyl number in the range from 25 to 60 and a molecular weight in the range from 2,000 to 6,000, and b. from about 0.5 to 10 wt.% of an aromatic polyester polyol having a hydroxyl number of from 50 to 250 which is the reaction product from (1) esterifying, in the absence of a catalyst, a residue from dibasic acid manufacture with an alkylene glycol to produce a polyester polyol intermediate, and (2) transesterifying, in the absence of a catalyst, recycled polyethylene terephthalate with the polyester polyol intermediate of the previous step.
Claim 7
Dependent Claim
29 words
The method of claim 4 in which the aromatic polyester polyol has a structure of the following formula ##STR6## where x is an integer of from 2 to 4.
Claim 8
Dependent Claim
21 words
The method of claim 4 in which the catalyst is a tertiary amine compound and the polyisocyanate is an aromatic diisocyanate.
Claim 9
Dependent Claim
138 words
A flexible polyurethane foam made by the process comprising reacting in the presence of a polyurethane catalyst an organic polyisocyanate and a polyol blend having an average hydroxyl number in the range from about 25 to 100 where the polyol blend comprises a. from about 90 to 99.5 wt.% of a polyester polyol or polyether polyol and b. from about 0.5 to 10 wt.% of an aromatic polyester polyol which is the reaction product from (1) esterifying, in the absence of a catalyst, a residue from dibasic acid manufacture which comprises one or more acids from the group consisting of glutaric acid, succinic acid and adipic acid, with an alkylene glycol to produce a polyester polyol intermediate, and (2) transesterifying, in the absence of a catalyst, recycled polyethylene terephthalate with the polyester polyol intermediate of the previous step.
Claim 10
Dependent Claim
138 words
A flexible polyurethane foam made by the process comprising reacting in the presence of a polyurethane catalyst an organic polyisocyanate and a polyol blend having an average hydroxyl number in the range from about 25 to 100 where the polyol blend comprises a. from about 90 to 99.5 wt.% of a polyester polyol or polyether polyol and b. from about 0.5 to 10 wt.% of an aromatic polyester polyol which is the reaction product from (1) esterifying, in the absence of a catalyst, a residue from dibasic acid manufacture which comprises one or more acids from the group consisting of glutaric acid, succinic acid and adipic acid, with an alkylene glycol to produce a polyester polyol intermediate, and (2) transesterifying, in the absence of a catalyst, recycled polyethylene terephthalate with the polyester polyol intermediate of the previous step.
Claim 11
Dependent Claim
48 words
The foam of claim 7 in which the polyether polyol has a hydroxyl number in the range from 25 to 60 and a molecular weight in the range from 2,000 to 6,000 and the aromatic polyester polyol has a hydroxyl number in the range from 50 to 250.
Claim 12
Dependent Claim
29 words
The foam of claim 7 in which the aromatic polyester polyol has a structure of the following formula ##STR7## where x is an integer of from 2 to 4.
Claim 13
Dependent Claim
21 words
The foam of claim 7 in which the catalyst is a tertiary amine compound and the polyisocyanate is an aromatic diisocyanate.
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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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |