US3894986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame resistant thermoplastic polyesters
Assignee: Hoechst AG
•
Filing: 1973-10-23
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Granted: 1975-07-15
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Expires: 1993-10-23
Abstract
Abstract Flame resistant thermoplastic polyesters, which contain alkali salts of phosphonic acids.
Inventors
- 👤 Werner Racky
- 👤 Walter Herwig
- 👤 Hans-Jerg Kleiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:17
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A FLAME-RESISTING THERMOPLASTIC POLYESTER COMPOSITION COMPRISING A MIXTURE OF POLYALKYLENE TEREPHTHALATE WHICH MAY CONTAIN UUP TO 10 MOLE PERCENT, BASED ON THE TOTAL DICARBOXYLIC ACID AND DIOL UNITS IN SAID POLYESTER, OF UNITS DERIVED FROM A DICARBOXYLIC ACID OTHER THAN TEREPHTHALIC ACID, AND UP TO 10 MOLE PERCENT OF UNITS DERIVED FROM A DIOL OTHER THAN AN ALKYLENE DIOL, AND A FLAME-RETARDING AMOUNT OF AN ALKALI SALT OF PHOSPHONIC ACIDS OF THE GENERAL FORMULA
Claim 2
Dependent Claim
74 words
A FLAME-RESISTING THERMOPLASTIC POLYESTER COMPOSITION COMPRISING A MIXTURE OF POLYALKYLENE TEREPHTHALATE WHICH MAY CONTAIN UUP TO 10 MOLE PERCENT, BASED ON THE TOTAL DICARBOXYLIC ACID AND DIOL UNITS IN SAID POLYESTER, OF UNITS DERIVED FROM A DICARBOXYLIC ACID OTHER THAN TEREPHTHALIC ACID, AND UP TO 10 MOLE PERCENT OF UNITS DERIVED FROM A DIOL OTHER THAN AN ALKYLENE DIOL, AND A FLAME-RETARDING AMOUNT OF AN ALKALI SALT OF PHOSPHONIC ACIDS OF THE GENERAL FORMULA
Claim 3
Dependent Claim
29 words
A polyester as claimed in claim 1, wherein the concentration of the alkali salts is between 5.5 and 35 parts by weight, calculated on the weight of the polymer.
Claim 4
Dependent Claim
20 words
A polyester as claimed in claim 1 wherein polyalkylene terephthalate has a reduced specific viscosity of between 0.5 and 2.0.
Claim 5
Dependent Claim
12 words
A polyester as claimed in claim 1 wherein the polyesters contain fillers.
Claim 6
Dependent Claim
16 words
Injection molded, compression molded and extrusion molded articles molded from the polyester composition of claim 1.
Claim 7
Dependent Claim
12 words
Sheets, fibers and filaments molded from the polyester composition of claim 1.
References Cited (Backward Citations)
US3474047A
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US3471552A
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US3463835A
Cited
US3576793A
Cited
US3522204A
Cited
US3664975A
Cited
US3751396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |