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EP0813741A1 - Wire coating composition - Google Patents

Wire coating composition

Info

Publication number
EP0813741A1
EP0813741A1 EP96904945A EP96904945A EP0813741A1 EP 0813741 A1 EP0813741 A1 EP 0813741A1 EP 96904945 A EP96904945 A EP 96904945A EP 96904945 A EP96904945 A EP 96904945A EP 0813741 A1 EP0813741 A1 EP 0813741A1
Authority
EP
European Patent Office
Prior art keywords
php
coating composition
wire coating
coating
phosphorous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96904945A
Other languages
German (de)
French (fr)
Inventor
Peter James Richardson
Joseph Preston
Dudley Noel Sawyer
Lai Ping Cheng
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scapa Group Ltd
Original Assignee
Scapa Group Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scapa Group Ltd filed Critical Scapa Group Ltd
Publication of EP0813741A1 publication Critical patent/EP0813741A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D123/04—Homopolymers or copolymers of ethene
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • 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
    • C08K5/54—Silicon-containing compounds
    • C08K5/541—Silicon-containing compounds containing oxygen
    • C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • C08L91/06—Waxes

Definitions

  • the present invention relates to a wire coating composition.
  • wire used herein embraces both wires and cables.
  • halogenated polymers such as polyvinyl chloride (PVC).
  • PVC polyvinyl chloride
  • the main problem of PVC and other halogenated polymers is that upon combustion a large volume of toxic, acidic and highly corrosive hydrogen halide smoke is liberated.
  • halogen-free polymer compositions for coating cables or wires have been developed. Examples of such compositions are included in EP 082407A, EP 488381A and US 5032321.
  • These and other prior art halogen-free coating compositions which are based upon thermoplastic polymer/mineral filler mixtures, possess inadequate abrasion resistance, electrical insulation properties and temperature stability.
  • compositions of the type disclosed in EP 082407A, EP 488381A and US 5032321 may only be one fifth of that for PVC.
  • Similar compositions containing intu escent system flame retardants, such as ammonium polyphosphate, have also been shown to exhibit inadequate electrical resistance due to the fact that the flame retardant attracts moisture and therefore increases the electrical conductivity of the material. It is noted that conventional phosphorous-based flame retardant compounds are contained in relatively large amounts, usually up to 40 php for ammonium polyphosphate.
  • a disadvantage with red phosphorous-based system is that the cable coatings have a strong red colouring, which is disadvantageous for electrical cable coatings in general.
  • the aim of the invention is to provide a recyclable and/or reprocessable halogen-free coating composition with improved abrasion resistance, electrical insulation and temperature resistance properties without a deterioration in other physical properties, such as tensile strength or flexibility.
  • a wire coating composition comprising polypropylene polymer or copolymer, polyethylene wax and magnesium hydroxide provided with a hydrophobic coating and wherein the wire coating composition does not contain any halogen and is essentially free of phosphorous and phosphorous compounds and phosphorous salts.
  • composition is free from “phosphorous” or compounds or salts thereof or has a phosphorous content of less than 800 ppm.
  • the wire coating composition of the present invention exhibits the required coating characteristics, but unlike some PVC compounds is readily recyclable.
  • the coating composition of the invention further provides the required electrical insulation, while being flexible, flame resistant, heat stable to greater than 125°C, abrasion resistant, readily extrudable and recyclable.
  • the components of the composition are ideally present in the following ratio: polypropylene 100 php (parts per hundred polypropylene) ; magnesium hydroxide 100 to 200 and ideally
  • the coating compositions are particularly useful for wires in motor vehicle engines, such wires being subjected to high temperatures and contact with water and fluids such as petrol, diesel, oil, salt solution and anti-freeze. It is necessary for wire coating materials under vehicle bonnets to have a temperature rating of greater than 100°C, at which temperature the coating should remain stable and retain electrical insulation properties.
  • the coating compositions according to the invention possess a temperature rating of greater than 125°C.
  • Polyethylene wax is incorporated to improve abrasion resistance.
  • Hard high molecular wax components would provide excellent abrasion resistance, but would also increase the tendency for stress cracking of the coating to occur.
  • Being a relatively low molecular weight material polyethylene wax enhances abrasion resistance of the coating without having an adverse effect on other coating properties.
  • the magnesium hydroxide acts as a filler and flame retardant.
  • the magnesium hydroxide particles are coated with a hydrophobic material such as an alkyl silane, for example a trimethoxysilane or triethoxysilane.
  • the coating enhances adhesion between the filler particles and the polymer matrix, improves the abrasion resistance of the coating and most importantly, due to its hydrophobic nature, increases the resistance of the coating to moisture entrapment thereby maintaining electrical insulation properties.
  • Magnesium hydroxide is also stable at high temperatures, whilst its low surface area gives it a low viscosity. It is therefore easy to process.
  • the preferred amount of 140 php magnesium hydroxide content gives the ideal balance between flame retardance and flexibility.
  • a high filler content gives excellent flame retardance.
  • the coating will become much less flexible such that the coated wire will fail a standard conductance test whereby a wire is tightly coiled (typically around a 1mm diameter mandrel) and stored in hot water (normally 80°C) whilst under high voltage. If the coating is not flexible enough then it will crack at the coil heads.
  • compositions according to the invention are that they can be extruded onto wire or cable using existing extrusion equipment at speeds similar to that of PVC coatings.
  • a cost saving may be made by using the coating compositions of the invention using the high temperature rating of the coatings. Normally a copper wire becomes hot due to the conduction of the electrical current.
  • the high temperature rating of the coating means that thin layers of coating can be used on thin wires, representing a saving of expensive copper.
  • a preferred embodiment of the invention involves the incorporation into the composition of a synergistic blend of an anti-oxidant derived from phenol and anti-oxidant based upon a phosphite.
  • anti-oxidants are present in an amount of only 0.1 to 0.5 php.
  • phosphite contents are sufficiently low (770 ppm) to have a negligible moisture attraction capability.
  • good processability is retained without adversely effecting the other physical properties of the coating. This aids further reprocessing of the coatings and therefore improves the recyclability of the compositions.
  • the polymeric composition of the invention may optionally further comprise additives such as stabilisers, plasticisers, lubricants and further flame retardants.
  • Example 1 Composition: 100 php propylene polymer 1
  • Magnifin H5KV 2 coated with AMEO-T 3 5 php polyethylene wax 4 1 polymer comprises 20 php Appryl 3060 MMS (tradename of Atocheirt for a propylene copolymer) and 80 php Moplen D50-G (tradename of Hi ont for a propylene homopolymer) .
  • Appryl 3060 MMS has a melt flow index of 0.5g per minute at 230°C and 21. 6 kg.
  • Moplen D50-G has a melt flow index of 0.3g per minute at 230°C and 21.6 kg.
  • the trade name of the wax is A-C 9/9A (tradename of A llie d Wax). This has a drop point of 115°C and a density of 0.93 g/cm 3 .
  • composition was extruded onto a standard metal wire used for automotive electrical cable applications, at a rate of a b out 700 per minute, using the normal extrusion equipment for PVC-coated cables, to form a coated cable with a cross-sectional area of 2.5mm 2 .
  • Such cables would commonly b e used as alternator or battery leads in a motor vehicle engine.
  • Abrasion Behaviour measured 500 cycles DIN 72551 > 3000 in terms of the number of hub Point 3.3.3 cycles to retain a mm. thickness of 2.5 mm 2
  • composition 100 php propylene polymer 1
  • polyethylene wax 1 polymer comprises 40 php Appryl 3060 MMS and 60 php Moplen D50-9.
  • Example 2 also passed the relevant tests which were carried out in relation to the composition of Example 1.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Insulating Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

A wire coating composition comprises 100 php (parts per hundred parts of polypropylene) polypropylene polymer or copolymer, 1 to 20 php of polyethylene wax and 100 to 200 php of magnesium hydroxide which is provided with a hydrophobic coating. The wire coating composition does not contain any halogen and is essentially free of phosphorous and phosphorous salts.

Description

WIRE COATING COMPOSITION
The present invention relates to a wire coating composition. The term "wire" used herein embraces both wires and cables.
It is conventional to provide a polymeric insulation coating around wires and cables. Such coatings are often made from halogenated polymers, such as polyvinyl chloride (PVC). The main problem of PVC and other halogenated polymers is that upon combustion a large volume of toxic, acidic and highly corrosive hydrogen halide smoke is liberated. As a consequence halogen-free polymer compositions for coating cables or wires have been developed. Examples of such compositions are included in EP 082407A, EP 488381A and US 5032321. These and other prior art halogen-free coating compositions, which are based upon thermoplastic polymer/mineral filler mixtures, possess inadequate abrasion resistance, electrical insulation properties and temperature stability. These coating compositions have a maximum temperature range of only 70-80°C. Furthermore, the extrusion speed for compositions of the type disclosed in EP 082407A, EP 488381A and US 5032321 may only be one fifth of that for PVC. Similar compositions containing intu escent system flame retardants, such as ammonium polyphosphate, have also been shown to exhibit inadequate electrical resistance due to the fact that the flame retardant attracts moisture and therefore increases the electrical conductivity of the material. It is noted that conventional phosphorous-based flame retardant compounds are contained in relatively large amounts, usually up to 40 php for ammonium polyphosphate.
A disadvantage with red phosphorous-based system is that the cable coatings have a strong red colouring, which is disadvantageous for electrical cable coatings in general.
The aim of the invention is to provide a recyclable and/or reprocessable halogen-free coating composition with improved abrasion resistance, electrical insulation and temperature resistance properties without a deterioration in other physical properties, such as tensile strength or flexibility.
According to the present invention there is provided a wire coating composition comprising polypropylene polymer or copolymer, polyethylene wax and magnesium hydroxide provided with a hydrophobic coating and wherein the wire coating composition does not contain any halogen and is essentially free of phosphorous and phosphorous compounds and phosphorous salts.
The term "essentially" is used herein to mean that the composition is free from "phosphorous" or compounds or salts thereof or has a phosphorous content of less than 800 ppm.
The wire coating composition of the present invention exhibits the required coating characteristics, but unlike some PVC compounds is readily recyclable. The coating composition of the invention further provides the required electrical insulation, while being flexible, flame resistant, heat stable to greater than 125°C, abrasion resistant, readily extrudable and recyclable.
The components of the composition are ideally present in the following ratio: polypropylene 100 php (parts per hundred polypropylene) ; magnesium hydroxide 100 to 200 and ideally
(coated) substantially 140 php; and polyethylene 1 to 20 and ideally substantially
10 php.
The coating compositions are particularly useful for wires in motor vehicle engines, such wires being subjected to high temperatures and contact with water and fluids such as petrol, diesel, oil, salt solution and anti-freeze. It is necessary for wire coating materials under vehicle bonnets to have a temperature rating of greater than 100°C, at which temperature the coating should remain stable and retain electrical insulation properties. The coating compositions according to the invention possess a temperature rating of greater than 125°C.
Polyethylene wax is incorporated to improve abrasion resistance. Hard high molecular wax components would provide excellent abrasion resistance, but would also increase the tendency for stress cracking of the coating to occur. Being a relatively low molecular weight material, polyethylene wax enhances abrasion resistance of the coating without having an adverse effect on other coating properties.
The magnesium hydroxide acts as a filler and flame retardant. In order to overcome the problems of moisture attraction associated with intumescent flame retardant systems, the magnesium hydroxide particles are coated with a hydrophobic material such as an alkyl silane, for example a trimethoxysilane or triethoxysilane. The coating enhances adhesion between the filler particles and the polymer matrix, improves the abrasion resistance of the coating and most importantly, due to its hydrophobic nature, increases the resistance of the coating to moisture entrapment thereby maintaining electrical insulation properties. Magnesium hydroxide is also stable at high temperatures, whilst its low surface area gives it a low viscosity. It is therefore easy to process.
The preferred amount of 140 php magnesium hydroxide content gives the ideal balance between flame retardance and flexibility. A high filler content gives excellent flame retardance. However, at the same time the coating will become much less flexible such that the coated wire will fail a standard conductance test whereby a wire is tightly coiled (typically around a 1mm diameter mandrel) and stored in hot water (normally 80°C) whilst under high voltage. If the coating is not flexible enough then it will crack at the coil heads.
A further advantage of the compositions according to the invention is that they can be extruded onto wire or cable using existing extrusion equipment at speeds similar to that of PVC coatings.
A cost saving may be made by using the coating compositions of the invention using the high temperature rating of the coatings. Normally a copper wire becomes hot due to the conduction of the electrical current. The high temperature rating of the coating means that thin layers of coating can be used on thin wires, representing a saving of expensive copper.
A preferred embodiment of the invention involves the incorporation into the composition of a synergistic blend of an anti-oxidant derived from phenol and anti-oxidant based upon a phosphite. Such anti-oxidants are present in an amount of only 0.1 to 0.5 php. Such phosphite contents are sufficiently low (770 ppm) to have a negligible moisture attraction capability. In such compositions good processability is retained without adversely effecting the other physical properties of the coating. This aids further reprocessing of the coatings and therefore improves the recyclability of the compositions.
The polymeric composition of the invention may optionally further comprise additives such as stabilisers, plasticisers, lubricants and further flame retardants.
In order that the invention may be more readily understood specific embodiments of the invention is now described in detail.
Example 1 Composition: 100 php propylene polymer1
140 php Magnifin H5KV2 coated with AMEO-T3 5 php polyethylene wax4 1 polymer comprises 20 php Appryl 3060 MMS (tradename of Atocheirt for a propylene copolymer) and 80 php Moplen D50-G (tradename of Hi ont for a propylene homopolymer) . Appryl 3060 MMS has a melt flow index of 0.5g per minute at 230°C and 21.6 kg. Moplen D50-G has a melt flow index of 0.3g per minute at 230°C and 21.6 kg.
2 magnesium hydroxide - a tradename of Martinswerk.
3 octyl triethoxy silane coupling agent, a tradename of
Hϋls.
4 The trade name of the wax is A-C 9/9A (tradename of Allied Wax). This has a drop point of 115°C and a density of 0.93 g/cm3.
The composition was extruded onto a standard metal wire used for automotive electrical cable applications, at a rate of about 700 per minute, using the normal extrusion equipment for PVC-coated cables, to form a coated cable with a cross-sectional area of 2.5mm2. Such cables would commonly be used as alternator or battery leads in a motor vehicle engine.
The test results for the coating are as follows:-
Test Requirement Standard Results Insulation Conductive cross-sectional DIN 72551 39 N area of 1.5 - 2.5 mm2 under Point 3.3.2 a load 10 - SO N
Abrasion Behaviour measured 500 cycles DIN 72551 > 3000 in terms of the number of hub Point 3.3.3 cycles to retain a mm. thickness of 2.5 mm2
Heat Resistance Under Load 0.15 mm DIN 72551 > 0.25 mm
(measured as the penetration Point 3.4.2 depth into the coating after heating for 4 hours at 125βC
Max. Thermal Shrinkage 4 % DIN 72551 2.5 % Point 3.4.2
Voltage Strength for 30 minutes 5 KV DIN 72551 passed Point 3.5.3
Min. Specific Resistance at 70°C 1010 ohms per cm DIN 72551 3.2 x 1014 Point 3.6.1
Thermal Shock (150βC for 48 hrs) Voltage Strength 1 KV DIN 72551 passed Point 3.6.2
Cold Strength ( - 40βC) Voltage Strength 1 KV DIN 72551 passed Point 3.6.3 Storage In Multi-Region Engine Voltage Strength 1 KV DIN 72551 passed
Oil (SAE 10 W-50) for 24 hrs at Point 3.6.2
90βC
Storage In Brake Fluid Voltage Strength 1 KV DIN 72551 passed
(Teyes ATE DOT 3) for 24 hrs at Point 3.6.2
90βC
Storage In Four Star Petrol Voltage Strength 1 KV DIN 72551 passed (see DIN 51601 ) for 24 hrs at Point 3.6.2 room temperature
Storage In Diesel Fuel Voltage Strength 1 KV DIN 72551 passed
(see DIN 51601 ) for 24 hrs at Point 3.6.2 room temperature
Example 2
Composition: 100 php propylene polymer1
140 php Magnifin H5KV coated with
AMEO-T
5 php polyethylene wax 1 polymer comprises 40 php Appryl 3060 MMS and 60 php Moplen D50-9.
The composition of Example 2 also passed the relevant tests which were carried out in relation to the composition of Example 1.
It is to be understood that the embodiments described above were by way of illustration only. Many modifications and variations are possible.

Claims

1. A wire coating composition comprising polypropylene polymer or copolymer, polyethylene wax and magnesium hydroxide provided with a hydrophobic coating and wherein the wire coating composition does not contain any halogen and is essentially free of phosphorous and phosphorous compounds and phosphorous salts.
2. A wire coating composition as claimed in claim 1, wherein the coated magnesium hydroxide is present in an amount in the range from 100 to 200 php.
3. A wire coating composition as claimed in claim 2, wherein the coated magnesium hydroxide is present in an amount of substantially 140 php.
4. A wire coating composition as claimed in any preceding claim, wherein the polyethylene wax is present in an amount in the range from 1 to 20 php.
5. A wire coating composition as claimed in claim 4, wherein the polyethylene wax is present in an amount of substantially 10 php.
6. A wire coating composition as claimed in any preceding claim, wherein the hydrophobic coating material comprises an alkyl silane.
7. A wire coating composition as claimed in any preceding claim, wherein the composition comprises from 0.1 to 0.5 php of an anti-oxidant.
EP96904945A 1995-03-08 1996-03-06 Wire coating composition Withdrawn EP0813741A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9504705.6A GB9504705D0 (en) 1995-03-08 1995-03-08 Wire coating composition
GB9504705 1995-03-08
PCT/GB1996/000501 WO1996027885A1 (en) 1995-03-08 1996-03-06 Wire coating composition

Publications (1)

Publication Number Publication Date
EP0813741A1 true EP0813741A1 (en) 1997-12-29

Family

ID=10770876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96904945A Withdrawn EP0813741A1 (en) 1995-03-08 1996-03-06 Wire coating composition

Country Status (6)

Country Link
EP (1) EP0813741A1 (en)
AU (1) AU4885996A (en)
CA (1) CA2214653A1 (en)
CZ (1) CZ281697A3 (en)
GB (1) GB9504705D0 (en)
WO (1) WO1996027885A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6552112B1 (en) 1997-07-23 2003-04-22 Pirelli Cavi E Sistemi S.P.A. Cable with self-extinguishing properties and flame-retardant composition
IT1293759B1 (en) * 1997-07-23 1999-03-10 Pirelli Cavi S P A Ora Pirelli CABLES WITH LOW RESIDUAL RECYCLABLE LINING
US6372344B1 (en) 1997-07-23 2002-04-16 Pirelli Cavi E Sistemi S.P.A. Cables with a halogen-free recyclable coating comprising polypropylene and an ethylene copolymer having high elastic recovery
US6410651B1 (en) 1997-07-23 2002-06-25 Pirelli Cavi E Sistemi S.P.A. Cables with a halogen-free recyclable coating comprising polypropylene and an ethylene copolymer having high structural uniformity
NZ502081A (en) * 1997-07-23 2002-05-31 Pirelli Cavi E Sistemi Spa Low-smoke self-extinguishing cable and flame-retardant composition used therein
IT1293757B1 (en) 1997-07-23 1999-03-10 Pirelli Cavi S P A Ora Pirelli CABLES WITH RECYCLABLE COVERING WITH HOMOGENEOUS DISTRIBUTION
AU740973B2 (en) * 1997-09-09 2001-11-15 Nkt Research Center A/S An electrically insulating material, method for the preparation thereof, and insulated objects comprising said material
US6849217B1 (en) 1998-12-24 2005-02-01 Pirelli Cavi E Sistemi S.P.A. Process for producing self-extinguishing cables with low-level production of fumes, and flame-retardant compositions used therein
US20070032581A1 (en) * 2003-10-01 2007-02-08 Klaus Stoll Additive mixtures

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1307864C (en) * 1985-11-27 1992-09-22 Lie Khong Djiauw Low smoke modified polypropylene insulation compositions and process for the preparation thereof
US5418272A (en) * 1991-12-10 1995-05-23 Nippon Petrochemicals Company, Limited Abrasion-resistant flame-retardant composition
US5476709A (en) * 1992-06-15 1995-12-19 Mitsui Toatsu Chemicals, Inc. Polymeric insulating material and formed article making use of the material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9627885A1 *

Also Published As

Publication number Publication date
CA2214653A1 (en) 1996-09-12
CZ281697A3 (en) 1998-01-14
GB9504705D0 (en) 1995-04-26
AU4885996A (en) 1996-09-23
WO1996027885A1 (en) 1996-09-12

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