US3859249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacture of flame retardant polyester
Assignee: Akzona Inc
•
Filing: 1972-12-07
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Granted: 1975-01-07
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Expires: 1992-12-07
Abstract
Abstract Polyester is made flame retardant by incorporating therein flame retardants, such as cyclophosphazene additives, prior to polycondensation, at ester interchange and in an amount of from about 1 percent to about 20 percent by weight; a preferred range is from 5 to 15 percent.
Inventors
- 👤 Gerald Willard Mcneely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:19
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/5399
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
IN THE PROCESS OF PREPARING POLYESTER POLYMER BY ESTER INTERCHANGE AND POLYCONDENSATION, THE IMPROVEMENT WHEREIN FLAME RETARDED POLYESTER POLYMER IS PREPARED BY ADDING FROM 1 TO 20 PERCENT BY WEIGHT OF A THERMALLY AND CHEMICALLY STABLE CYCPHOSPHAZENE DERIVATIVE AT THE BEGINNING OF ESTER INTERCHANGE, SAID DERIVATIVE BEING SELECTED FROM THE GROUP CONSISTING OF CYCLOTRI- AND CYCLOTETRAPHOSPHAZENE HAVING, RESPECTIVELY, 6 OR 8 SUBSTITUENTS THEREON SELECTED FROM THE GROUP CONSISTING OF PHENYL OR PHENOXY SAID CYCLOPHOSPHANZENE DERIVATIVE BEING THERMALLY AND CHEMICALLY STABLE AT TEMPERATURES UP TO ABOUT 300*C.
Claim 2
Dependent Claim
86 words
IN THE PROCESS OF PREPARING POLYESTER POLYMER BY ESTER INTERCHANGE AND POLYCONDENSATION, THE IMPROVEMENT WHEREIN FLAME RETARDED POLYESTER POLYMER IS PREPARED BY ADDING FROM 1 TO 20 PERCENT BY WEIGHT OF A THERMALLY AND CHEMICALLY STABLE CYCPHOSPHAZENE DERIVATIVE AT THE BEGINNING OF ESTER INTERCHANGE, SAID DERIVATIVE BEING SELECTED FROM THE GROUP CONSISTING OF CYCLOTRI- AND CYCLOTETRAPHOSPHAZENE HAVING, RESPECTIVELY, 6 OR 8 SUBSTITUENTS THEREON SELECTED FROM THE GROUP CONSISTING OF PHENYL OR PHENOXY SAID CYCLOPHOSPHANZENE DERIVATIVE BEING THERMALLY AND CHEMICALLY STABLE AT TEMPERATURES UP TO ABOUT 300*C.
Claim 3
Dependent Claim
22 words
Process according to claim 1 wherein said cyclophosphazene is added in an amount of from about 5 to about 15 weight percent.
Claim 4
Dependent Claim
41 words
In the process of preparing polyester polymer by ester interchange and polycondensation, the improvement wherein flame retarded polyester polymer is prepared by adding from 1 to 20 percent by weight hexaphenoxycyclotriphosphazene as flame retardant additive at the beginning of ester interchange.
Claim 5
Dependent Claim
41 words
In the process of preparing polyester polymer by ester interchange and polycondensation, the improvement wherein flame retarded polyester polymer is prepared by adding from 1 to 20 percent by weight hexaphenoxycyclotriphosphazene as flame retardant additive at the beginning of ester interchange.
Claim 6
Dependent Claim
23 words
A process according to claim 3 wherein said hexaphenoxycyclotriphosphazene flame retardant is added in an amount from 5 to 15 percent by weight.
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |