US3985705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized polyester compositions
Assignee: Ingredion Inc
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Filing: 1975-02-05
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Granted: 1976-10-12
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Expires: 1995-02-05
Abstract
Abstract Saturated polyester compositions stabilized against thermal degradation by the addition of small amount 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 diamines.
Inventors
- 👤 Paul C. Georgoudis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:46
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/10; C08K5/109; C08K5/36; C08K5/37; C08K5/375
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
A saturated polyester composition stabilized against thermal degradation comprising: a. a polyester blended with b. 0.3 to 5.0 percent, by weight of the polyester, of a combination comprising
Claim 2
Dependent Claim
28 words
A saturated polyester composition stabilized against thermal degradation comprising: a. a polyester blended with b. 0.3 to 5.0 percent, by weight of the polyester, of a combination comprising
Claim 3
Dependent Claim
68 words
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. the remainder of said combination comprising at least one antioxidant selected from the group consisting of alkylated phenols and alkylidene bisphenols wherein the alkyl groups contain from 2 to 18 carbon atoms, thiobisphenols and polyphenols.
Claim 4
Dependent Claim
68 words
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. the remainder of said combination comprising at least one antioxidant selected from the group consisting of alkylated phenols and alkylidene bisphenols wherein the alkyl groups contain from 2 to 18 carbon atoms, thiobisphenols and polyphenols.
Claim 5
Dependent Claim
19 words
The stabilized polyester composition of claim 1 wherein said carbonate is ethylene carbonate and said antioxidant is 1,3,5-trimethyl 2,4,6-tris(3,5-tert-4-hydroxybenzyl)benzene.
Claim 6
Dependent Claim
20 words
The stabilized polyester composition of claim 1 wherein said carbonate is ethylene carbonate; and said antioxidant is 4, 4'-thiobis (6-tert-butyl-m-cresol).
Claim 7
Dependent Claim
27 words
The stabilized polyester composition of claim 1 wherein said carbonate is ethylene carbonate; and said antioxidant component is a mixture of pentaerythrityl tetrakis[-beta-(4-hydroxy-3,5-tert-butylphenyl)] propionate and dilauryl thiodipropionate.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |