US3946136A
Expired / Lapsed
US
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Process for connecting shaped structures containing polytetrafluoroethylene
Assignee: Hoechst AG
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Filing: 1974-02-28
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Granted: 1976-03-23
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Expires: 1994-02-28
Abstract
Abstract Shaped structures containing polytetrafluoroethylene are connected with themselves or with another material stable up to 400 DEG C under elevated pressure and temperature using as interlayer between the surfaces to be connected at least one copolymer of tetrafluoroethylene and perfluoroalkyl-perfluorovinyl units in a determined proportion. The composites obtained have a high mechanic strength and the joint has good temperature endurance properties.
Inventors
- 👤 Herbert Fitz
- 👤 Franz Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:25
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C65/00; B29C65/48; B29C65/50; B29C65/5057; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/71; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91421; B29C66/919; B32B27/28; B32B27/285; B32B27/32; B32B27/322; C; C09; C09J; C09J127/00; C09J127/02; C09J127/12; C09J127/18; B29C43/00; B29C43/006; B29C65/4805; B29C65/481; B29C65/482; B29C65/82; B29C65/8207; B29C65/8215; B29C66/72; B29C66/721; B29C66/7212; B29C66/73; B29C66/731; B29C66/7312; B29C66/73121; B29C66/92; B29C66/929; B29C66/94; B29C66/949; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2105/00; B29K2105/06; B29K2105/16; B29K2305/00; B29K2305/04; B29K2305/08; B29K2305/10; B29K2305/12; B29K2307/00; B29K2309/00; B29K2309/02; B29K2309/08; B29K2309/10; B29K2309/12; B29K2995/00; B29K2995/0012; B29K2995/0017; B29L; B29L2031/00; B29L2031/04; B32B2327/00; B32B2327/12; B32B2327/18; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12104; Y10T428/12111; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
A process for connecting shaped structures containing polytetrafluoroethylene with themselves or with another material stable at a temperature of up to 400°C, which comprises placing between the structures to be connected an interlayer consisting of at least one copolymer of from 90 to 99.5 % by weight of tetra-fluoroethylene and 0.5 to 10 % by weight of a perfluoroalykl-perfluorovinyl ether of the formula CF 2 = CF--OR in which R represents a perfluoroalkyl chain having from 1 to 10 carbon atoms and compressing the composite structure under a pressure of from 0.1 to 20 kg/cm 2 at a temperature of from 320° to 400°C.
Claim 2
Dependent Claim
104 words
A process for connecting shaped structures containing polytetrafluoroethylene with themselves or with another material stable at a temperature of up to 400°C, which comprises placing between the structures to be connected an interlayer consisting of at least one copolymer of from 90 to 99.5 % by weight of tetra-fluoroethylene and 0.5 to 10 % by weight of a perfluoroalykl-perfluorovinyl ether of the formula CF 2 = CF--OR in which R represents a perfluoroalkyl chain having from 1 to 10 carbon atoms and compressing the composite structure under a pressure of from 0.1 to 20 kg/cm 2 at a temperature of from 320° to 400°C.
Claim 3
Dependent Claim
35 words
The process of claim 1, wherein the interlayer consists of at least one copolymer of from 95 to 99 % by weight of tetra-fluoroethylene and 1 to 5 % by weight of the perfluoroalkyl-perfluorovinyl ether.
Claim 4
Dependent Claim
19 words
The process of claim 1, wherein the perfluoroalkyl-perfluorovinyl ether has an alkyl chain of 1 to 3 carbon atoms.
Claim 5
Dependent Claim
92 words
A composite structure consisting of shaped structures containing polytetrafluoroethylene connected with themselves or another material stable at a temperature of up to 400°C and an interlayer of at least one copolymer of from 90 to 99.5 % by weight of tetrafluoroethylene and 0.5 to 10 % weight of a perfluoro-alkyl-perfluorovinyl ether of the formula CF 2 = CF-- OR wherein R represents a perfluoroalkyl chain having from 1 to 10 carbon atoms, said composite structure being compressed at 320° to 400°C under a pressure of from 0.1 to 20 kg/cm 2 .
Claim 6
Dependent Claim
92 words
A composite structure consisting of shaped structures containing polytetrafluoroethylene connected with themselves or another material stable at a temperature of up to 400°C and an interlayer of at least one copolymer of from 90 to 99.5 % by weight of tetrafluoroethylene and 0.5 to 10 % weight of a perfluoro-alkyl-perfluorovinyl ether of the formula CF 2 = CF-- OR wherein R represents a perfluoroalkyl chain having from 1 to 10 carbon atoms, said composite structure being compressed at 320° to 400°C under a pressure of from 0.1 to 20 kg/cm 2 .
Claim 7
Dependent Claim
38 words
A composite structure as claimed in claim 4 wherein the interlayer consists of at least one copolymer of from 95 to 99 % by weight of tetrafluoroethylene and 5 to 1 % by weight of a perfluoro-alkyl-perfluorovinyl ether.
Claim 8
Dependent Claim
22 words
A composite structure as claimed in claim 4, wherein the perfluoroalkyl-perfluorovinyl ether has an alkyl chain of 1 to 3 carbon atoms.
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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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |