GB2176491A - Polymeric compositions containing hydrated inorganic fillers - Google Patents
Polymeric compositions containing hydrated inorganic fillers Download PDFInfo
- Publication number
- GB2176491A GB2176491A GB08515316A GB8515316A GB2176491A GB 2176491 A GB2176491 A GB 2176491A GB 08515316 A GB08515316 A GB 08515316A GB 8515316 A GB8515316 A GB 8515316A GB 2176491 A GB2176491 A GB 2176491A
- Authority
- GB
- United Kingdom
- Prior art keywords
- composition
- polymeric composition
- polymeric
- vanadium
- polymeric compositions
- 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- Withdrawn
Links
Classifications
-
- 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
-
- 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
Abstract
The swelling of polymeric compositions which contain hydrated inorganic filler material in the presence of water is reduced by adding a vanadium V compound to the composition.
Description
SPECIFICATION
Polymeric compositions
This invention relates to polymeric compositions which contain hydrated inorganic filler material.
Such compositions swell in the presence of water and we have found that such swelling can be reduced or eliminated by adding an appropriate amountofvanadium Vcompoundto the composition.
The invention provides a polymeric composition containing hydrated inorganicfiller material and a vanadium V compound.
It is believed that at least somme of the swelling of polymeric compositions containing hydrated inorganic filler material, such as hydrated alumina or magnesium hydroxide, isduetothe presence of residual inorganic ions such as sodium ions in thefiller material and that swelling duethereby is reduced because ofthe complexing ofthe inorganic ions by the vanadium Vcompound.
Previously silanes have been added to polymeric compositions to reducethe amount of swelling thereof in the presence of water, but have adversely affected the mechanical properties of the composition, such as tensile strength, elongation at break and tear strength. The addition of vanadium pentoxideto polymeric compositions containing hydrated alumina has been found to cause no noticeable effect on such mechanical properties.
The polymer of the polymeric composition may be a thermoplastics material or a cross-linked material (the cross-linking being carried out either by chemical means or irradiation).
The invention is especially applicable to polymeric compositions for use as flame retardant insulation orfire retardant coverings for electrical equipment, particularly where that equipment is for use in a wet environment where the inorganic ion concentration of the water is relatively low.
In orderthatthe invention may be better understood two examples thereof will now be described.
The three compositions set out in Table 1 below are suitable for forming aflame retardant insulating layer about a conductor of an electric cable and particularly for insulating low voltage signal, control and power cables of one or more conductor cores. As can be seen composition B is the same as composition A except that it additionally contains vanadium pentoxide. Composition C is the same as composition A exceptthat it additionally contains antimony pentoxide which is an anti-swelling compound suggested in UK Patent
Specification No.2068 347B.
Table! Formulation, parts by weight
Composition A B C
Ethylene vinyl acetate 100 100 100 Alumina trihydrate 120 120 120
Antioxidant (lrganoxlolobyClBAGeigy) 1 1 1
Vanadium pentoxide 1
Antimony pentoxide 1
Each of the three compositions, after being irradiated at 121/2 M rads, was tested in accordance with BS6899, for its electrical resistance properties after being immersed in water for one minute at 200C, for 24 hours at 200C and for 7 days at 50"C. The results in these tests are set forth in Table II below from which it can be clearly seen that the reduction in the electrical resistivity for composition B is markedly less than that for composition A and also significantly less than for composition C.
Table II Electrical Resistivity (Mkm) After After A fter immersion immersion for immersion for for 7 days at
Composition 1minuteat20 C 24hrsat20 C 50 C A 572 323 3.7
B 1187 554 234
C 1050 484 107
The two compositions set out in Table Ill belowaresuitableforforming aflame retardant sheath foran electric cable or wire, for example for the outer of two layers of a dual extruded covering of a signal carrying wire. Composition E is the same as composition D exceptthat it additionally contains vanadium pentoxide.
Tablelil Formulation, parts by weight
Composition D E
Ethylene methyl acrylate copolymer 100 100
Alumina trihydrate 120 120 Antioxidant(lrganoxl0l0) 1 1 Vanadium pentoxide 1
Each ofthe two compositions was tested, after being irradiated at 20 Mrads, in accordance with ISO/DIS 1817 to determine the amount it swelled after being immersed in deionised water for seven days at 700C and for 28 days at50 C. The results ofthesetests are given in Table IB below and showthatthe amount of swelling in composition E is less than that in composition D.
Table IV percentage increase in volume
After after
Composition 7 days at 70"C 28 days at 50'C D 9.8 10.1
E 7.5 7.5
Claims (11)
1. A polymericcomposition containing a hydrated inorganicfiller material and a vanadium Vcompound.
2. A polymeric composition as claimed in claim 1, wherein said filler comprises magnesium hydroxide.
3. A polymeric composition as claimed in claim 1,wherein said filler comprises a hydrated alumina.
4. A polymeric composition as claimed in claim 3, wherein said hydrated alumina comprises alumina trihydrate.
5. A polymeric composition as claimed in any one of claims 1 to 4, wherein said vanadium Vcompound comprises vanadium pentoxide.
6. A polymeric composition as claimed in any one of claims 1 to 5, wherein the polymer of the polymeric composition comprises a thermoplastics material.
7. A polymeric composition as claimed in any one of claims 1 to 5, wherein the polymer ofthe polymeric composition comprises a cross-linkable material.
8. Electrical equipment provided with a covering formed from a composition as claimed in any one of claims 1 to 7.
9. An electrical conductor having an insulating layerthereaboutformed from a composition as claimed in any one of claims 1 to 7.
10. An electric cable or wire having a flame retardant sheath formed from a composition as claimed in any one of claims 1 to 7.
11. A polymeric compisition as claimed in claim 1 and substantially as herein described in the examples.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08515316A GB2176491A (en) | 1985-06-17 | 1985-06-17 | Polymeric compositions containing hydrated inorganic fillers |
| FR8611762A FR2602779A1 (en) | 1985-06-17 | 1986-08-14 | POLYMERIC COMPOSITIONS AND ELECTRICAL EQUIPMENT, CONDUCTOR AND CABLE THAT ARE COATED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08515316A GB2176491A (en) | 1985-06-17 | 1985-06-17 | Polymeric compositions containing hydrated inorganic fillers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8515316D0 GB8515316D0 (en) | 1985-07-17 |
| GB2176491A true GB2176491A (en) | 1986-12-31 |
Family
ID=10580866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08515316A Withdrawn GB2176491A (en) | 1985-06-17 | 1985-06-17 | Polymeric compositions containing hydrated inorganic fillers |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2602779A1 (en) |
| GB (1) | GB2176491A (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4154718A (en) * | 1976-09-02 | 1979-05-15 | Kyowa Chemical Industry Co. Ltd. | Fire-retardant thermoplastic resin composition |
| JPS5392855A (en) * | 1977-01-27 | 1978-08-15 | Kyowa Kagaku Kougiyou Kk | Noncombustible composition of thermoplastic resin |
| DK169628B1 (en) * | 1979-11-03 | 1994-12-27 | Raychem Ltd | Water-stabilized polymeric material and electrical equipment |
-
1985
- 1985-06-17 GB GB08515316A patent/GB2176491A/en not_active Withdrawn
-
1986
- 1986-08-14 FR FR8611762A patent/FR2602779A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB8515316D0 (en) | 1985-07-17 |
| FR2602779A1 (en) | 1988-02-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |