Patent US3987004A successfully refreshed from Google Patents.
US3987004A
Expired / Lapsed
US
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Stabilized polyester compositions
Assignee: Ingredion Inc
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Filing: 1975-01-31
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Granted: 1976-10-19
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Expires: 1995-01-31
Abstract
Abstract Saturated polyester compositions stabilized against thermal degradation by the addition of small amounts of a synergistic stabilizing combination of a 5 or 6 membered, cyclic organic carbonate and an antioxidant selected from the group consisting of certain alkylated phenols, polyphenols, alkylphosphites, arylphosphites, aromatic amines and aromatic polyamines.
Inventors
- 👤 Paul C. Georgoudis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:31
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/109; C08K5/16; C08K5/17; C08K5/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A saturated polyester composition stabilized against thermal degradation comprising: a. a polyester blended with b. 0.3 to 5.0 per cent, by weight of the polyester, of a combination comprising 1. 10 to 90 percent, by weight, of at least one cyclic organic carbonate having at least one cyclic organic carbonate group per molecule containing 5 - 6 atoms in the ring, and 2.
Claim 2
Dependent Claim
63 words
A saturated polyester composition stabilized against thermal degradation comprising: a. a polyester blended with b. 0.3 to 5.0 per cent, by weight of the polyester, of a combination comprising 1. 10 to 90 percent, by weight, of at least one cyclic organic carbonate having at least one cyclic organic carbonate group per molecule containing 5 - 6 atoms in the ring, and 2.
Claim 3
Dependent Claim
43 words
the remainder of said combination comprising at least one aromatic amine antioxidant selected from the group consisting of primary polyamines, diarylamines, bisdiarylamines, mixtures containing diarylamines, modified bisdiarylamines, alkylated diarylamines, mixtures containing alkylated diarylamines, ketone-diarylamine condensation products, dihydroquinolines, mixtures of dihydroquinolines and diarylamines, aldehyde-amine
Claim 4
Dependent Claim
43 words
the remainder of said combination comprising at least one aromatic amine antioxidant selected from the group consisting of primary polyamines, diarylamines, bisdiarylamines, mixtures containing diarylamines, modified bisdiarylamines, alkylated diarylamines, mixtures containing alkylated diarylamines, ketone-diarylamine condensation products, dihydroquinolines, mixtures of dihydroquinolines and diarylamines, aldehyde-amine
Claim 5
Dependent Claim
26 words
condensation products, alkylarylamines and aldehyde imines. 2. The stabilized polyester composition of claim 1 wherein said carbonate is ethylene carbonate and said antioxidant is p-phenylene diamine.
Claim 6
Dependent Claim
18 words
The stabilized polyester composition of claim 1 wherein said carbonate is ethylene carbonate and said antioxidant is N-phenyl-alpha-naphthylamine.
References Cited (Backward Citations)
US3301825A
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US3528936A
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US3551381A
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US3620824A
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US3657191A
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US3880803A
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US3775374A
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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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |