USRE28628E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation treated poly(ethylene/chlorotrifluoroethylene) and poly(ethylene/tetrafluoroethylene) having improved high temperature properties
Assignee: EIDP Inc
•
Filing: 1974-03-29
•
Granted: 1975-11-25
•
Expires: 1994-03-29
Abstract
Abstract The subjecting of poly(ethylene/tetrafluoroethylene) and poly(ethylene/chlorotrifluoroethylene) to a moderate amount of ionizing radiation has the effect of improving the tensile properties, especially ultimate elongation, of the copolymers at elevated temperatures. The amount of radiation required to obtain this improvement is minimized by following the radiation treatment with heat treatment of the copolymer.
Inventors
- 👤 D Carlson
- 👤 N West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:44
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; B; B01; B01J; B01J19/00; B01J19/08; B01J19/081; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
86 words
A process for (improving the high temperature tensile properties) increasing the ultimate elongation of poly(ethylene/tetrafluoroethylene) comprising subjecting the copolymer (to an effective amount of ionizing radiation,) , after melt fabrication to an amount of ionizing radiation effective to increase the ultimate elongation of the copolymer when measured at 200*C. the ethylene content of said copolymer being from 40 to 60 mole percent and the tetrafluoroethylene content of said copolymer being from 40 to 60 mole percent, based on the ethylene plus tetrafluoroethylene content of the copolymer.
Claim 2
Dependent Claim
86 words
A process for (improving the high temperature tensile properties) increasing the ultimate elongation of poly(ethylene/tetrafluoroethylene) comprising subjecting the copolymer (to an effective amount of ionizing radiation,) , after melt fabrication to an amount of ionizing radiation effective to increase the ultimate elongation of the copolymer when measured at 200*C. the ethylene content of said copolymer being from 40 to 60 mole percent and the tetrafluoroethylene content of said copolymer being from 40 to 60 mole percent, based on the ethylene plus tetrafluoroethylene content of the copolymer.
Claim 3
Dependent Claim
14 words
The process of claim 1 and additionally heat-treating the copolymer, following the subjecting step.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the subjecting step is carried out at a temperature less than 60* C.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the content of ethylene and tetrafluoroethylene is from 45 to 55 mole percent for each.
Claim 6
Dependent Claim
30 words
The process of claim 1 wherein said radiation is at a dosage of from 2 to 80 megarads and at a temperature below the glass transition temperature of said copolymer.
Claim 7
Dependent Claim
7 words
The irradiated (copolymer) product of claim 1.
Claim 8
Dependent Claim
99 words
A PROCESS FOR (IMPROVING THE HIGH TEMPERATURE TENSILE PROPERTIES) INCREASING THE ULTIMATE ELONGATION OF A COPOLYMER SELCTED FROM THE GROUP CONSISTING OF POLY(ETHYLENE/TETRAFLUOROETHYLENE) OR POLY(ETHYLENE/CHLOROTRIFLUOROETHYLENE), COMPRISING SUBJECTING THE COPOLYMER (TO AN EFFECT AMOUNT OF IONIZING RADIATION) AFTER MELT FABRICATION TO AN AMOUNT OF IONIZING RADIATION EFFECTIVE TO INCREASE THE ULTIMATE ELONGATION OF THE COPOLYMER WHEN MEASURED AR 200*C THE ETHYLENE CONTENT OF SAID COPOLYMER BEING FROM 40 TO 60 MOLE PERCENT AND THE TETRAFLUOROETHYLENE OR CHLOROTRIFLUOROETHYLENE CONTENT OF SAID COPOLYMER BEING FROM 40 TO 60 MOLE PERCENT BASED ON THE ETHYLENE PLUS TETRAFLUOROETHYLENE OR CHLOROTRIFLUOROETHYLENE CONTENT OF THE COPOLYMER.
Claim 9
Dependent Claim
99 words
A PROCESS FOR (IMPROVING THE HIGH TEMPERATURE TENSILE PROPERTIES) INCREASING THE ULTIMATE ELONGATION OF A COPOLYMER SELCTED FROM THE GROUP CONSISTING OF POLY(ETHYLENE/TETRAFLUOROETHYLENE) OR POLY(ETHYLENE/CHLOROTRIFLUOROETHYLENE), COMPRISING SUBJECTING THE COPOLYMER (TO AN EFFECT AMOUNT OF IONIZING RADIATION) AFTER MELT FABRICATION TO AN AMOUNT OF IONIZING RADIATION EFFECTIVE TO INCREASE THE ULTIMATE ELONGATION OF THE COPOLYMER WHEN MEASURED AR 200*C THE ETHYLENE CONTENT OF SAID COPOLYMER BEING FROM 40 TO 60 MOLE PERCENT AND THE TETRAFLUOROETHYLENE OR CHLOROTRIFLUOROETHYLENE CONTENT OF SAID COPOLYMER BEING FROM 40 TO 60 MOLE PERCENT BASED ON THE ETHYLENE PLUS TETRAFLUOROETHYLENE OR CHLOROTRIFLUOROETHYLENE CONTENT OF THE COPOLYMER.
Claim 10
Dependent Claim
10 words
The process of claim 7 wherein said copolymer is poly(ethylene/chlorotrifluoroethylene).
Claim 11
Dependent Claim
21 words
The process of claim 8 wherein the content of ethylene and chlorotrifluoroethylene is from 45 to 55 mole percent for each.
Claim 12
Dependent Claim
15 words
The process of claim 8 and additionally heat treating the copolymer, following the subjecting step.
Claim 13
Dependent Claim
7 words
The irradiated (copolymer) product of claim 8.
Claim 14
Dependent Claim
19 words
The process of claim (12) 7 wherein each said copolymer has a melting point of at least 220* C.
Claim 15
Dependent Claim
18 words
The process of claim 8 wherein said irradiation is at a dosage of from 12 to 50 megarads.
Claim 16
Dependent Claim
18 words
The process of claim 8 wherein said irradiation is at a dosage of from 25 to 50 megarads.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |