US3882209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for extrusion coating electric wires with a foamed polyolefin resin involving reduced die-plateout
Assignee: Furukawa Electric Co Ltd
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Filing: 1973-07-30
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Granted: 1975-05-06
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Expires: 1993-07-30
Abstract
Abstract A method for manufacturing electric wires insulated with a foamed polyolefin-series resin by continuous, stable extrusion wherein a foamable polyolefin-series resin composition prepared by mixing a polyolefin-series resin with a foaming agent comprising azodicarbonamide and at least 10 per cent by weight of a material having a solubility parameter of 12.0 or more based on the amount of said azodicarbonamide is used for insulation of electric conductor.
Inventors
- 👤 Koji Yanagisawa
- 👤 Hirokazu Kobayashi
- 👤 Yukio Tayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:53
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/13
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
144 words
A METHOD FOR MANUFACTURING ELECTRIC WIRES INSULATED WITH A FOAM POLYOLEFIN RESIN BY CONTINUOUS, STALE EXTRUSION WHEREIN A FOAMAABLE POLYOLEFIN RESIN COMPOSITION IS PREPARED BY MIXING A POLYOLEFIN RESIN WITH A FOAMING AGENT COMPRISING AZODICARBONAMIDE AND BETWEN ABOUT 10 AND 150 PERCENT BY WEIGHT OF AT LEAST ONE MATERIAL HAVING A SOLUBILITY PARAMETER OF AT LEAST 12.0 BASED ON THE AMOUNT OF SAID AZODICARBONAMIDE AND EXTRUDING IT ON AN ELECTRIC CONDUCTOR UNDER CONDITIONS IN WHICH SAID AZODICARBONAMIDE DECOMPOSES, SAID MATERIAL HAVING SAID SOLUBILITY PARAMETER BEING SELECTED FROM THE GROUP CONSISTING OF POLYHYDRIC ALCOHOLS HAVING LESS THAN EIGHT CARBON AOMS, ETHANOL AMINES HAVING LESS THAN SIX CARBON ATOMS, ALKANOLS HAVING LESS THAN THREE CARBON AOMS, DIMETHYL SULFOXIDE, CARBOXYMETHYL CELLULOSE, METHYL CELLULOSE, LIGNIN, LIGNIN SULFONIC ACID, LACTONES, ALKYL ACETAMIDES, ALKYLFORMAMIDES, PHENOLS, ETHYLENE CARBONATE, THIOUREA, SUCCINIMIDE, AND COMPOUNDS CONTAINING A 1,3,5-TRIAZINE RING EXPRESSED BY THE GENERAL FORMULA
Claim 2
Independent Claim
144 words
A METHOD FOR MANUFACTURING ELECTRIC WIRES INSULATED WITH A FOAM POLYOLEFIN RESIN BY CONTINUOUS, STALE EXTRUSION WHEREIN A FOAMAABLE POLYOLEFIN RESIN COMPOSITION IS PREPARED BY MIXING A POLYOLEFIN RESIN WITH A FOAMING AGENT COMPRISING AZODICARBONAMIDE AND BETWEN ABOUT 10 AND 150 PERCENT BY WEIGHT OF AT LEAST ONE MATERIAL HAVING A SOLUBILITY PARAMETER OF AT LEAST 12.0 BASED ON THE AMOUNT OF SAID AZODICARBONAMIDE AND EXTRUDING IT ON AN ELECTRIC CONDUCTOR UNDER CONDITIONS IN WHICH SAID AZODICARBONAMIDE DECOMPOSES, SAID MATERIAL HAVING SAID SOLUBILITY PARAMETER BEING SELECTED FROM THE GROUP CONSISTING OF POLYHYDRIC ALCOHOLS HAVING LESS THAN EIGHT CARBON AOMS, ETHANOL AMINES HAVING LESS THAN SIX CARBON ATOMS, ALKANOLS HAVING LESS THAN THREE CARBON AOMS, DIMETHYL SULFOXIDE, CARBOXYMETHYL CELLULOSE, METHYL CELLULOSE, LIGNIN, LIGNIN SULFONIC ACID, LACTONES, ALKYL ACETAMIDES, ALKYLFORMAMIDES, PHENOLS, ETHYLENE CARBONATE, THIOUREA, SUCCINIMIDE, AND COMPOUNDS CONTAINING A 1,3,5-TRIAZINE RING EXPRESSED BY THE GENERAL FORMULA
Claim 3
Dependent Claim
26 words
A method according to claim 1 wherein the foamable polyolefin-series resin composition is extruded on an electric conductor in a thickness of less than 1.0 mm.
Claim 4
Dependent Claim
34 words
A method according to claim 1 wherein 10 to 150 per cent by weight of the material having a solubility parameter of 12.0 or more is added based on the amount of azodicarbonamide used.
Claim 5
Dependent Claim
15 words
A method according to claim 1 wherein the polyolefin-series resin is a homopolymer of olefins.
Claim 6
Dependent Claim
18 words
A method according to claim 1 wherein the polyolefin-series resin is a copolymer of olefins and vinyl monomers.
Claim 7
Dependent Claim
12 words
A method according to claim 1 wherein the polyolefin-series resin is polyethylene.
Claim 8
Dependent Claim
12 words
A method according to claim 1 wherein the polyolefin-series resin is polypropylene.
Claim 9
Dependent Claim
14 words
A method according to claim 1 wherein the foaming agent consists of azodicarbonamide alone.
Claim 10
Dependent Claim
29 words
A method according to claim 1 wherein the foaming agent consists of azodicarbonamide and another foaming agent thermally decomposable at the extrusion temperature of the foamable polyolefin-series resin composition.
Claim 11
Dependent Claim
33 words
A method according to claim 1 wherein the foaming agent consists of azodicarbonamide and a volatile liquid foaming agent that turns into gas at the extrusion temperature of the foamable polyolefin-series resin composition.
Claim 12
Dependent Claim
18 words
A method according to claim 1 wherein the foaming agent consists of azodicarbonamide and at least one gas.
Claim 13
Dependent Claim
29 words
A method according to claim 9 wherein the thermally decomposable foaming agent is at least one selected from the group consisting of p,p''-oxybisbenzenesulfonyl hydrazide, p-toluenesulfonyl semicarbazide, and dinitrosopentamethylene tetramine.
Claim 14
Dependent Claim
30 words
A method according to claim 10 wherein the volatile liquid foaming agent is at least one selected from the group consisting of benzene, hexane, isopentane, n-pentane, petroleum ether and monofluorotrichloromethane.
Claim 15
Independent Claim
33 words
A method according to clam 11 wherein the gas used As a foaming agent is at least one selected from the group consisting of carbon dioxide gas, nitrogen gas, propane, butane and dichlorodifluoromethane.
Claim 16
Independent Claim
33 words
A method according to clam 11 wherein the gas used As a foaming agent is at least one selected from the group consisting of carbon dioxide gas, nitrogen gas, propane, butane and dichlorodifluoromethane.
Claim 17
Dependent Claim
35 words
A method according to claim 1 wherein the material having a solubility parameter of 12.0 or more is at least one selected from the group consisting of sodium salt of carboxymethyl cellulose, lignin, and melamine.
Claim 18
Dependent Claim
32 words
A method according to claim 1 wherein the material having a solubility parameter of 12.0 or more is at least one selected from the group consisting of ethylene glycol, glycerin and triethanolamine.
References Cited (Backward Citations)
US3562367A
Cited
US3440309A
Cited
US3461088A
Cited
US3455863A
Cited
US3523916A
Cited
US3600309A
Cited
US3644230A
Cited
US3645929A
Cited
US3645930A
Cited
US3755208A
Cited
US3742103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |