WO1995004359A1 - Protective coatings for insulating coatings on electrical wires - Google Patents
Protective coatings for insulating coatings on electrical wires Download PDFInfo
- Publication number
- WO1995004359A1 WO1995004359A1 PCT/GB1994/001474 GB9401474W WO9504359A1 WO 1995004359 A1 WO1995004359 A1 WO 1995004359A1 GB 9401474 W GB9401474 W GB 9401474W WO 9504359 A1 WO9504359 A1 WO 9504359A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- melamine cyanurate
- coatings
- coating
- insulating coating
- flame retardant
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
- C08K5/3492—Triazines
- C08K5/34928—Salts
Definitions
- This invention is concerned with providing an insulating coating on an electrical wire with a flame retardant protective coating, and with wires having such protective coatings.
- the coatings on electrical wires should be flame retardant, ie they must pass tests relating to the time that they burn after a flame has been removed therefrom before extinguishing themselves.
- the combination of a PVC insulating coating and a Nylon 6 protective coating is sufficiently flame retardant to pass such tests since PVC, in the case of fire, releases chlorine radicals which act as a retardant sufficient to act on both the PVC and the Nylon 6.
- PVC in the case of fire, releases chlorine radicals which act as a retardant sufficient to act on both the PVC and the Nylon 6.
- PVC in the case of fire
- insulating coatings made of polyolefins and polydefinic co-polymers are coming into use.
- the chlorine radicals released by PVC are not available to act as a flame retardant for Nylon 6 so that the combination of such an insulating coating and the Nylon 6 protective coating does not pass the flammability tests.
- the insulating coating when made of polyolefin or olefin co-polymer may be made flame retardant by dispersing a flame retardant material such as magnesium hydroxide therein but this flame retardancy does not extend to the Nylon 6.
- Providing the Nylon 6 with a flame retardant has proved difficult since dispersing a flame retardant in such a thin coating results in surface imperfections which can lead to cra ⁇ ks, prevents the coating from having sufficient elongation to remain intact during coiling and is difficult to extrude successfully.
- the invention provides a method of providing an insulating coating on an electrical wire with a flame retardant protective coating, characterised in that the method comprises dispersing melamine cyanurate into a polyamide to form an intermediate composition containing a pre-determined proportion of melamine cyanurate, dispersing said composition into a further quantity of the polyamide to form a moulding composition containing 5-30% by weight of the melamine cyanurate, and extruding said moulding composition onto said insulating coating.
- the method according to the invention results in a smooth elongatable coating which provides sufficient fire retardancy to enable the flammability tests to be passed.
- the moulding composition can be extruded without undue problems such as foaming occurring.
- Melamine cyanurate is a well known flame retardant used in quantities of about 5-10% by weight in Nylon 6 which is used for injection moulding electrical components. However, if the standard formulations used for injection moulding are used for the purpose of a protective coating as referred to above, it is found that unsatisfactory coatings are obtained. When the percentage of melamine cyanurate is increased, the material is found to foam in the extruder and give increasingly rough coatings. However, with the use of the method according to the invention, the foaming problem is not experienced during compounding and smooth satisfactory coatings are obtained.
- the intermediate composition has 10-60% by weight of melamine cyanurate dispersed therein.
- said moulding composition contains 10-20% by weight of melamine cyanurate.
- the polyamide is a Nylon 6, for example a high viscosity Nylon 6.
- the moulding composition may be extruded as a coating 50 to 200 microns in thickness, eg approximately 125 microns in thickness.
- the invention also provides an electrical wire having an insulating coating thereon with a flame retardant protective coating applied thereto by a method according to the invention.
- a screw type plastics extruding machine was used to disperse 50% by weight of melamine cyanurate into a Nylon 6.
- the intermediate composition extruded by the machine thus contained a predetermined proportion of melamine cyanurate.
- the extrusion from the machine was allowed to solidify and was granulated. It was then dispersed into a further quantity of the high viscosity Nylon 6 in a further extruding machine which extruded the composition through a die on to the insulating coating of an electrical wire.
- the coating was approximately 125 microns in thickness.
- the moulding composition extruded had a melamine cyanurate content of approximately 15% by weight, ie the intermediate composition was dispersed into an equal quantity of Nylon 6.
- the extruded protective coating was found to have a very smooth surface which was substantially free of imperfections and gave good elongation.
- the wire also passed the standard flammability test.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
An electrical wire having an insulating coating thereon is provided with a protective coating on its insulating coating. Melamine cyanurate is dispersed into a polyamide to form an intermediate composition which is dispersed into a further quantity of the polyamide and extruded onto the insulating coating.
Description
Protective Coatings For Insulating Coatings On Electrical Wires
This invention is concerned with providing an insulating coating on an electrical wire with a flame retardant protective coating, and with wires having such protective coatings.
It is common practice to provide electrical wires with an insulating coating made of plastic material. The most common such material being polyvinyl chloride (PVC) . It is also well known to provide such an insulating coating with a thin outer protective coating of a polyamide (for example Nylon 6) to provide, for example, scuff resistance. Such protective coatings are conventionally extruded on to the insulating coating. The protective coating must be smooth, to avoid imperfections, which can initiate cracks, and must be capable of high elongations without breaking so that the wire can be coiled without breaching the protective coating.
It is a requirement that the coatings on electrical wires should be flame retardant, ie they must pass tests relating to the time that they burn after a flame has been removed therefrom before extinguishing themselves. The combination of a PVC insulating coating and a Nylon 6 protective coating is sufficiently flame retardant to pass such tests since PVC, in the case of fire, releases chlorine radicals which act as a retardant sufficient to act on both the PVC and the Nylon 6. However, there is an increasing tendency to avoid the use of PVC as an
insulating coating because PVC releases halogens in the event of fire. For example, insulating coatings made of polyolefins and polydefinic co-polymers are coming into use. In this case, the chlorine radicals released by PVC are not available to act as a flame retardant for Nylon 6 so that the combination of such an insulating coating and the Nylon 6 protective coating does not pass the flammability tests. The insulating coating when made of polyolefin or olefin co-polymer, may be made flame retardant by dispersing a flame retardant material such as magnesium hydroxide therein but this flame retardancy does not extend to the Nylon 6. Providing the Nylon 6 with a flame retardant has proved difficult since dispersing a flame retardant in such a thin coating results in surface imperfections which can lead to craςks, prevents the coating from having sufficient elongation to remain intact during coiling and is difficult to extrude successfully.
It is an object of the present invention to provide a method of providing an insulating coating on an electrical wire with a flame retardant protective coating which is substantially free of surface imperfections and has sufficient elongation.
The invention provides a method of providing an insulating coating on an electrical wire with a flame retardant protective coating, characterised in that the method comprises dispersing melamine cyanurate into a polyamide to form an intermediate composition containing a pre-determined proportion of melamine cyanurate, dispersing said composition into a further quantity of the polyamide to form a moulding composition containing 5-30% by weight of the melamine cyanurate, and extruding said moulding composition onto said insulating coating.
The method according to the invention results in a smooth elongatable coating which provides sufficient fire
retardancy to enable the flammability tests to be passed. The moulding composition can be extruded without undue problems such as foaming occurring.
Melamine cyanurate is a well known flame retardant used in quantities of about 5-10% by weight in Nylon 6 which is used for injection moulding electrical components. However, if the standard formulations used for injection moulding are used for the purpose of a protective coating as referred to above, it is found that unsatisfactory coatings are obtained. When the percentage of melamine cyanurate is increased, the material is found to foam in the extruder and give increasingly rough coatings. However, with the use of the method according to the invention, the foaming problem is not experienced during compounding and smooth satisfactory coatings are obtained.
Preferably, the intermediate composition has 10-60% by weight of melamine cyanurate dispersed therein.
Preferably, said moulding composition contains 10-20% by weight of melamine cyanurate.
Preferably, the polyamide is a Nylon 6, for example a high viscosity Nylon 6.
The moulding composition may be extruded as a coating 50 to 200 microns in thickness, eg approximately 125 microns in thickness.
The invention also provides an electrical wire having an insulating coating thereon with a flame retardant protective coating applied thereto by a method according to the invention.
There now follows a detailed example which is illustrative of the invention.
In the example, a screw type plastics extruding machine was used to disperse 50% by weight of melamine cyanurate into a Nylon 6. The intermediate composition extruded by the machine thus contained a predetermined proportion of melamine cyanurate. The extrusion from the machine was allowed to solidify and was granulated. It was then dispersed into a further quantity of the high viscosity Nylon 6 in a further extruding machine which extruded the composition through a die on to the insulating coating of an electrical wire. The coating was approximately 125 microns in thickness. The moulding composition extruded had a melamine cyanurate content of approximately 15% by weight, ie the intermediate composition was dispersed into an equal quantity of Nylon 6.
The extruded protective coating was found to have a very smooth surface which was substantially free of imperfections and gave good elongation. The wire also passed the standard flammability test.
Claims
A method of providing an insulating coating on an electrical wire with a flame retardant protective coating, characterised in that the method comprises dispersing melamine cyanurate into a polyamide to form an intermediate composition containing a pre¬ determined proportion of melamine cyanurate, dispersing said composition into a further quantity of the polyamide to form a moulding composition containing 5-30% by weight of the melamine cyanurate, and extruding said moulding composition onto said insulating coating.
A method according to Claim 1, characterised in that said intermediate composition has 10 to 60% by weight of melamine cyanurate dispersed therein.
A method according to either one of Claims 1 and 2, characterised in that said moulding composition contains 10 to 20% by weight of melamine cyanurate.
A method according to any one of Claims 1 to 3, characterised in that the polyamide is the high viscosity Nylon 6.
A method according to any one of Claims 1 to 4, characterised in that the moulding composition is extruded as a coating 50 to 200 microns in thickness.
An electrical wire having a flame retardant protective coating applied thereto by a method according to any one of Claims 1 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9316009.1 | 1993-08-03 | ||
| GB9316009A GB2280634A (en) | 1993-08-03 | 1993-08-03 | Flame retardant coatings for insulated electrical wires |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1995004359A1 true WO1995004359A1 (en) | 1995-02-09 |
Family
ID=10739844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1994/001474 WO1995004359A1 (en) | 1993-08-03 | 1994-07-07 | Protective coatings for insulating coatings on electrical wires |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2280634A (en) |
| WO (1) | WO1995004359A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996028499A1 (en) * | 1995-03-13 | 1996-09-19 | E.I. Du Pont De Nemours And Company | Flame resistant polyamide resin composition and process for manufacture thereof |
| EP1676877A1 (en) * | 2004-12-28 | 2006-07-05 | Campine N.V. | Flame resistant polyamide and/or polyester composition, and process for manufacture thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2605251A1 (en) * | 2011-12-15 | 2013-06-19 | Nexans | Temperature-resistant halogen-free cable |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54148050A (en) * | 1978-05-13 | 1979-11-19 | Asahi Chem Ind Co Ltd | Flame-retardant polyamide composition |
| JPS56106955A (en) * | 1980-01-31 | 1981-08-25 | Asahi Chem Ind Co Ltd | Flame-retardant polyamide composition |
| JPS58134162A (en) * | 1982-02-04 | 1983-08-10 | Furukawa Electric Co Ltd:The | Insulated wire |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6033850B2 (en) * | 1977-01-17 | 1985-08-05 | 日産化学工業株式会社 | Flame retardant resin composition |
| GB2103822B (en) * | 1981-07-23 | 1985-08-21 | Standard Telephones Cables Ltd | Flame retardant plastics sheathed optical and/or electrical cables |
| GB2170646B (en) * | 1982-10-01 | 1987-02-11 | Raychem Ltd | Flame retardant cable |
| IT1160761B (en) * | 1983-03-25 | 1987-03-11 | Pirelli Cavi Spa | LOW VOLTAGE CABLE |
-
1993
- 1993-08-03 GB GB9316009A patent/GB2280634A/en not_active Withdrawn
-
1994
- 1994-07-07 WO PCT/GB1994/001474 patent/WO1995004359A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54148050A (en) * | 1978-05-13 | 1979-11-19 | Asahi Chem Ind Co Ltd | Flame-retardant polyamide composition |
| JPS56106955A (en) * | 1980-01-31 | 1981-08-25 | Asahi Chem Ind Co Ltd | Flame-retardant polyamide composition |
| JPS58134162A (en) * | 1982-02-04 | 1983-08-10 | Furukawa Electric Co Ltd:The | Insulated wire |
Non-Patent Citations (3)
| Title |
|---|
| DATABASE WPI Section Ch Derwent World Patents Index; Class A23, AN 81-74570D * |
| PATENT ABSTRACTS OF JAPAN vol. 4, no. 12 (C - 71) 29 January 1980 (1980-01-29) * |
| PATENT ABSTRACTS OF JAPAN vol. 7, no. 248 (C - 193) 4 November 1983 (1983-11-04) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996028499A1 (en) * | 1995-03-13 | 1996-09-19 | E.I. Du Pont De Nemours And Company | Flame resistant polyamide resin composition and process for manufacture thereof |
| EP1676877A1 (en) * | 2004-12-28 | 2006-07-05 | Campine N.V. | Flame resistant polyamide and/or polyester composition, and process for manufacture thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2280634A (en) | 1995-02-08 |
| GB9316009D0 (en) | 1993-09-15 |
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