US4346229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction products of DMT process residue and dipropylene glycol
Assignee: CAPE INDUSTRIES ("CAPE")
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Filing: 1980-05-01
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Granted: 1982-08-24
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Expires: 2000-05-01
Abstract
Abstract Described is a process for producing unique reaction products from DMT process residue. In the process of this invention DMT process residue is reacted with an excess of dipropylene glycol to give normally liquid, aromatic polyester polyols which are compatible with Freon 11 blowing agent and with glycerol and hence have outstanding utility in the production of blown polyurethane and polyisocyanurate-polyurethane foams.
Inventors
- 👤 Leighton K. Derr
- 👤 Lyle B. Hawkins
- 👤 Marlene J. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4225; C08G18/4244; C08G18/4247; C08G18/425; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
63 words
The reaction product produced by reacting DMT process residue with a quantity of dipropylene glycol or a mixture thereof with up to 50% by weight of one or more different glycols, in moles, in excess of the number of equivalents of available acid and methyl ester present in said residue, as determined by the acid number and the methoxyl content of said residue.
Claim 2
Dependent Claim
63 words
The reaction product produced by reacting DMT process residue with a quantity of dipropylene glycol or a mixture thereof with up to 50% by weight of one or more different glycols, in moles, in excess of the number of equivalents of available acid and methyl ester present in said residue, as determined by the acid number and the methoxyl content of said residue.
Claim 3
Dependent Claim
16 words
The reaction product of claim 1 containing less than 25% by weight of unreacted dipropylene glycol.
References Cited (Backward Citations)
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Cited
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US3892796A
Cited
US4112240A
Cited
US4039487A
Cited
US4237238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |