US4110308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized ethylene-tetrafluoroethylene copolymer composition
Assignee: AGC Inc
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Filing: 1976-08-25
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Granted: 1978-08-29
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Expires: 1996-08-25
Abstract
Abstract Ethylene-tetrafluorethylene copolymer compositions are stabilized against thermal degradation by incorporating therein a small amount of a copper compound.
Inventors
- 👤 Takeshi Abe
- 👤 Masahiko Ichimura
- 👤 Makoto Noshiro
- 👤 Nobuaki Kunii
- 👤 Yasumichi Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:02
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/10; C08K3/105; C08K3/02; C08K3/08; C08K3/18; C08K3/20; C08K3/22; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L27/00; C08L27/02; C08L27/12; C08L27/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
An ethylene-tetrafluoroethylene copolymer composition having improved thermal stability which comprises an ethylene-tetrafluoroethylene copolymer wherein said copolymer comprises from 30 to 60 mole % of tetrafluoroethylene units, and from 0.1 ppm to 10 wt.% of a copper compound based on the weight of the copolymer and wherein said copper compound is copper, copper oxide, or a compound which is converted to copper oxide by heating in air at the molding temperature of said copolymer.
Claim 2
Dependent Claim
73 words
An ethylene-tetrafluoroethylene copolymer composition having improved thermal stability which comprises an ethylene-tetrafluoroethylene copolymer wherein said copolymer comprises from 30 to 60 mole % of tetrafluoroethylene units, and from 0.1 ppm to 10 wt.% of a copper compound based on the weight of the copolymer and wherein said copper compound is copper, copper oxide, or a compound which is converted to copper oxide by heating in air at the molding temperature of said copolymer.
Claim 3
Dependent Claim
24 words
The composition of claim 1, wherein the copper compound is copper or a compound which is converted to copper oxide by heating in air.
Claim 4
Dependent Claim
14 words
The composition of claim 1, wherein the copper compound is supported on a carrier.
Claim 5
Dependent Claim
26 words
The composition of claim 1, wherein the copper compound is supplied by the wearing of a copper alloy machine element during the processing of said copolymer.
Claim 6
Dependent Claim
14 words
The composition of claim 1, wherein the copper compound is added together with α-alumina.
Claim 7
Dependent Claim
30 words
The composition of claim 1, wherein the copolymer comprises from about 30 to 60 mole percent of ethylene units and from about 40 to 70 mole percent of tetrafluoroethylene units.
Claim 8
Dependent Claim
21 words
The composition of claim 1, wherein the copolymer has a volumetric melt flow rate of about 10 - 300mm 3 /sec.
Claim 9
Dependent Claim
24 words
The composition of claim 1, wherein the copolymer has a flow initiation temperature of 260°-300° C and a thermal decomposition temperature of 320°-360° C.
Claim 10
Dependent Claim
17 words
The composition of claim 5, wherein the α-alumina has an average particle diameter of less than 100μm.
Claim 11
Dependent Claim
29 words
The composition of claim 1, wherein the amount of the copper compound is from 0.1 ppm to 0.1 wt% and the copper compound is uniformly dispersed in the copolymer.
References Cited (Backward Citations)
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US3622537A
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US3682859A
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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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |