US4267098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized copolymers based on ethylene and tetrafluoroethylene, and processes for their preparation
Assignee: Hoechst AG
•
Filing: 1979-01-19
•
Granted: 1981-05-12
•
Expires: 1999-01-19
Abstract
Abstract Mixtures of (a) copolymers of ethylene and tetrafluoroethylene, which in addition optionally contain up to 10 mole % of units of at least one ethylenically mono-unsaturated monomer copolymerizable with tetrafluoroethylene, with (b) phosphorus acids which in one of their tautomeric forms contain 2 or 3 oxygen atoms and 1 or 2 hydrogen atoms directly bonded to each phosphorus atom, or with salts of such acids, are described. These mixtures possess improved heat stability and can, where appropriate with interpolation of a melt granulation process, be used, in particular, for the coating of metals. Component (b) is added to the copolymer (a) in the dry form or preferably in the form of a solution during working up, and in particular is added either to the pulverulent copolymer or, more especially, to a moist product, isolated from dispersions, after the last washing process.
Inventors
- 👤 Robert Hartwimmer
- 👤 Jurgen Kuhls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/443; H01B3/445; C; C08; C08K; C08K3/00; C08K3/32; H01B3/441; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
A mixture comprising: (a) 99.999 to 98% by weight, calculated on the mixture, of at least one ethylene-tetrafluoroethylene copolymer which in addition to polymerized ethylene and tetrafluoroethylene units can contain further polymerized units, derived from monomers which are copolymerizable with tetrafluoroethylene, and (b) 0.001 to 2% by weight, calculated on the mixture, of at least one metal salt of an acid of phosphorus selected from the group consisting of phosphorous acid H 2 (HPO 3 ), diphosphorous acid H 2 (H 2 P 2 O 5 ), hypodiphosphorous acid H 2 (H 2 P 2 O 4 ), and hypophosphorous acid H(H 2 PO 2 ), or mixtures thereof wherein the cation of that metal salt is a metal cation of the first to third main group of the periodic table of the elements, zinc or manganese.
Claim 2
Dependent Claim
137 words
A mixture comprising: (a) 99.999 to 98% by weight, calculated on the mixture, of at least one ethylene-tetrafluoroethylene copolymer which in addition to polymerized ethylene and tetrafluoroethylene units can contain further polymerized units, derived from monomers which are copolymerizable with tetrafluoroethylene, and (b) 0.001 to 2% by weight, calculated on the mixture, of at least one metal salt of an acid of phosphorus selected from the group consisting of phosphorous acid H 2 (HPO 3 ), diphosphorous acid H 2 (H 2 P 2 O 5 ), hypodiphosphorous acid H 2 (H 2 P 2 O 4 ), and hypophosphorous acid H(H 2 PO 2 ), or mixtures thereof wherein the cation of that metal salt is a metal cation of the first to third main group of the periodic table of the elements, zinc or manganese.
Claim 3
Dependent Claim
25 words
A mixture according to claim 1, which comprises 99.99 to 98% by weight of component (a) and 0.01 to 2% by weight of component (b).
Claim 4
Dependent Claim
25 words
A mixture according to claim 1, which contains a copolymer comprising from 40 to 70 mole %, relative to the copolymer, of polymerized ethylene units.
Claim 5
Dependent Claim
53 words
A mixture according to claim 1 or 2, which contains a copolymer comprising polymerized ethylene units and tetrafluoroethylene units and up to 10 mole%, relative to the copolymer, of further units which are derived from at least one ethylenically mono-unsaturated monomer which is copolymerizable with tetrafluoroethylene and does not act as a telogen.
Claim 6
Dependent Claim
16 words
A mixture according to claim 1, which contains at least one metal salt of phosphorous acid.
Claim 7
Dependent Claim
19 words
A mixture according to claim 5, which contains at least one magnesium, calcium or aluminum salt of phosphorous acid.
Claim 8
Dependent Claim
43 words
A process for the preparation of a mixture according to claim 1, wherein, after preparation of component (a) of the mixture by copolymerization of the corresponding monomers in emulsion or suspension, component (b) of the mixture is added when working up the copolymer.
Claim 9
Dependent Claim
18 words
A process according to claim 7, wherein component (b) of the mixture is added as an aqueous solution.
Claim 10
Dependent Claim
93 words
A process according to claim 7, wherein 0.01 to 3% by weight of component (b) of the mixture are dissolved or dispersed in water, at most 1 part by weight of the copolymer is treated, after the last washing, with 1 part by weight of this solution or dispersion and thereafter excess solution is again separated off, so that a moist product results which contains about 40 to 60% by weight, relative to the moist product, of the copolymer, after which the moist product is dried at temperatures of up to 220° C.
Claim 11
Dependent Claim
24 words
The process of claim 9 wherein said drying is carried out in the presence of an inert gas or under reduced pressure or both.
Claim 12
Dependent Claim
11 words
The process of claim 9 wherein the dried product is melt-granulated.
Claim 13
Dependent Claim
13 words
A wire having a coating consisting essentially of the mixture of claim 1.
References Cited (Backward Citations)
US2879257A
Cited
US3219605A
Cited
US3303154A
Cited
US3454517A
Cited
US3870689A
Cited
US3700627A
Cited
US3745145A
Cited
US3893971A
Cited
US4110308A
Cited
US4147683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |