US3880693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for bonding together films based on cured butyl rubber, polychloroprene and/or rubber-like copolymers of ethylene, at least one other alpha-alkene and, optionally, one or several polyenes
Assignee: Stamicarbon BV
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Filing: 1973-04-26
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Granted: 1975-04-29
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Expires: 1993-04-26
Abstract
Abstract A process for bonding together cured rubbery films is disclosed, wherein cured polychloroprene, butyl rubber, and/or rubbery copolymers of ethylene with at least one other alpha-alkene of 3 to 8 carbon atoms are bonded together by placing a layer of a curable rubbery polymer composition which generates heat upon exposure to a high frequency electric field between the films and heating the assembly of films under pressure in an electric field having a frequency of about 0.1 to about 500 megacycles per second. The time of heating can be appreciably shortened without diminishing the strength of the bond between the films, and without film damage. The bonded films are suitable for sealing and lining applications.
Inventors
- 👤 Pierre M G J Urlings
- 👤 Marinus J R Visseren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:41
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/04; B32B25/08; B29; B29C; B29C35/00; B29C35/02; B29C35/12; B32B25/16; B32B25/18; B32B27/00; B32B37/00; B32B37/06; C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; B29K; B29K2019/00; B29L; B29L2030/00; B32B2305/00; B32B2305/72; C08J2321/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
123 words
IN A PROCESS FOR HOLDING TOGETHER CURED FILMS OF A RUBBERY POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYCHLOROPRENE, BUTYL RUBBER, RUBBERY COPOLYMERS OF ETHYLENE WITH AT LEAST ONE OTHER ALPHA-ALKENE OF 3 TO 8 CARBON ATOMS, AND MIXTURES THEREOF, BY PLACING BETWEEN THE FILMS TO BE BONDED A LAYER OF A CURABLERUBBERY POLYMER AND THEREAFTER HEATING THE ASSEMBLY OF FILMS UNDER A PRESSURE OF AT LEAST 1 KGS/CM2, THE IMPROVEMENT COMPRISING USING A CURABLE RUBBERY POLYMER COMPOSITION WHICH GENERATES HEAT UPON EXPOSURE TO A HIGH FREQUENCY ELECTRIC FIELD, AND HEATING THE ASSEMBLY OF FILMS IN AN ELECTRIC FIELD HAVING A FREQUENCY OF ABOUT 0.1 TO ABOUT 500 MEGACYCLES PER SECOND FOR A TIME AT LEAST SUFFICIENT TO SURE THE CURABLE RUBBERY POLYMER.
Claim 2
Dependent Claim
123 words
IN A PROCESS FOR HOLDING TOGETHER CURED FILMS OF A RUBBERY POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYCHLOROPRENE, BUTYL RUBBER, RUBBERY COPOLYMERS OF ETHYLENE WITH AT LEAST ONE OTHER ALPHA-ALKENE OF 3 TO 8 CARBON ATOMS, AND MIXTURES THEREOF, BY PLACING BETWEEN THE FILMS TO BE BONDED A LAYER OF A CURABLERUBBERY POLYMER AND THEREAFTER HEATING THE ASSEMBLY OF FILMS UNDER A PRESSURE OF AT LEAST 1 KGS/CM2, THE IMPROVEMENT COMPRISING USING A CURABLE RUBBERY POLYMER COMPOSITION WHICH GENERATES HEAT UPON EXPOSURE TO A HIGH FREQUENCY ELECTRIC FIELD, AND HEATING THE ASSEMBLY OF FILMS IN AN ELECTRIC FIELD HAVING A FREQUENCY OF ABOUT 0.1 TO ABOUT 500 MEGACYCLES PER SECOND FOR A TIME AT LEAST SUFFICIENT TO SURE THE CURABLE RUBBERY POLYMER.
Claim 3
Dependent Claim
18 words
Process according to claim 1 wherein said electric field has a frequency of about 27 megacycles per second.
Claim 4
Dependent Claim
23 words
Process according to claim 1, wherein the curable rubbery polymer, when cured, is substantially identical to the rubbery polymer of the cured films.
Claim 5
Dependent Claim
27 words
Process according to claim 1, wherein the cured film is a rubbery copolymer of ethylene with at least one other alpha-alkene with 3 to 8 carbon atoms.
Claim 6
Dependent Claim
53 words
Process according to claim 4, wherein said rubbery copolymer of ethylene contains about 20 to 85 mole % of ethylene units, about 15 to 80 mole % of units of at least one other alpha-alkenE and about 0 to 10 mole % of at least one polyene of 4 to 20 carbon atoms.
Claim 7
Dependent Claim
13 words
Process according to claim 5 wherein the curable rubbery polymer is butyl rubber.
Claim 8
Dependent Claim
55 words
Process according to claim 5 wherein the curable rubbery polymer is an uncured rubbery copolymer of 20 to 85 mole % ethylene, 15 to 80 mole % of at least one other alpha-alkene of 3 to 8 carbon atoms, and to 10 mole % of at least one polyene of 4 to 20 carbon atoms.
Claim 9
Dependent Claim
16 words
Process according to claim 1, wherein said rubbery polymer of the cured films is butyl rubber.
Claim 10
Dependent Claim
13 words
Process according to claim 8, wherein the curable rubbery polymer is butyl rubber.
Claim 11
Dependent Claim
56 words
Process according to claim 8, wherein the curable rubbery polymer is a rubbery copolymer of 20 to 85 mole % of ethylene, 15 to 80 mole % of at least one other alpha-alkene of 3 to 8 carbon atoms, and 0 to 10 mole % of at least one polyene of 4 to 20 carbon atoms.
Claim 12
Dependent Claim
30 words
Process according to claim 1, wherein the curable rubbery polymer composition contains about 20 to about 200% by weight of carbon black based on the amount of curable rubbery polymer.
Claim 13
Dependent Claim
15 words
Process according to claim 1, wherein said rubbery polymer of the cured films is polychloroprene.
Claim 14
Dependent Claim
12 words
Process according to claim 12, wherein the curable rubbery polymer is polychloroprene.
Claim 15
Dependent Claim
26 words
Process according to claim 1, wherein the curable rubbery polymer compound generates more heat upon exposure to the high frequency electric field than the cured films.
References Cited (Backward Citations)
US3429769A
Cited
US3620875A
Cited
US3528867A
Cited
US3574031A
Cited
US3649438A
Cited
US3660224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |