GB2151236A - Polymer sheathing material for cables and wires - Google Patents
Polymer sheathing material for cables and wires Download PDFInfo
- Publication number
- GB2151236A GB2151236A GB08429596A GB8429596A GB2151236A GB 2151236 A GB2151236 A GB 2151236A GB 08429596 A GB08429596 A GB 08429596A GB 8429596 A GB8429596 A GB 8429596A GB 2151236 A GB2151236 A GB 2151236A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ethylene
- weight
- vinyl acetate
- cross
- polymer mixture
- 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.)
- Granted
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
Description
SPECIFICATION
Polymer sheathing material
This invention relates to a polymer mixture for the sheathing of cables and wires and in particular to a silane cross-linkable polymer mixture for the sheathing of electric and/or optical cables and wires, of the kind which contains copolymers of ethylene-vinyl acetate and ethylene-butyl acrylate, organosilane grafted thereon for the cross-linking, a cross-linking catalyst, and a flame-retardant filling material.
Polymer mixtures of the aforementioned type for the sheathing of cables and wires are commercially available. Upon adding the catalyst, they are chiefly processed by way of extrusion in the course of which, owing to the effects of humidity from the ambient atmosphere and on account of the grafted silane, there occurs a silane cross-linking or vulcanizing. As a catalyst there is used, for example, dibutyl-tin dilaurate in the form of a 10-% batch based on ethylene-vinyl acetate (EVA). The silane cross-linking can be accelerated by immersing the extruded product in hot water or by exposing it to water vapour. The cross-linked product shows itself to have an elongation at break of about 130% and an oxygen index of 29%. For some practical applications, the material is not sufficiently flame-retardant, this being indicated by the relatively low oxygen index.With this material it is not possible to increase the flame-retardant properties by adding a further aluminium hydroxide. Moreover, with regard to some practical applications, the material is of insufficient flexibility.
It is an object of the present invention to modify the aforementioned polymer mixture in such a way that the cross-linked product has a substantially improved flame-retardant property as well as a higher flexibility.
According to the invention in its broadest aspect, a polymer mixture of the kind referred to is characterized in that the mixture additionally contains 3 to 15% by weight of the total amount of ethylene-vinyl acetate having a vinyl-acetate content of 50%, as well as 21 to 32% by weight of the total amount of aluminium hydroxide.
By combining the previously known polymer mixture with an ethylene-vinyl acetate copolymer having a vinyl-acetate content of 50% it is achieved that the mixture can take up a considerable amount of aluminium hydroxide, thus considerably improving the flame-retardant properties of the final product. At the same time, the final product has a substantially higher flexibility than the known polymer mixture. In spite of this modification, the mixture can be cross-linked just like the conventional types of silane cross-linkable polymer mixtures. The final product shows itself to have an elongation at break of 150% and thus complies better with the requirements of VDE 0207, Pt.27, than the original mixture. The oxygen index amounts to about 40%, which implies that the flame-retardant properties have been improved considerably.Therefore, even with thin cables, it is possible to comply with the flame test according to VDE 0472, Pt. 804 Method C. In spite of the higher degree of filling, the modified material is considerably more flexible than the previously known silane cross-linked material.
A cross-linkable polymer mixture according to the invention has a composition within the ranges specified below, with ethylene-vinyl acetate being referred to as EVA, and with vinyl-acetate being referred to as VA:
grafted, flame-retardant polymer 53 to 75% by weight
EVA copolymer (50% VA) 3 to 15% by weight
aluminium hydroxide 21 to 32% by weight
The preferred composition consists of the following components: :
grafted, flame-retardant polymer
+ catalyst 146 parts by weight
EVA copolymer (50% VA) 40 parts by weight
aluminium hydroxide 85 parts by weight
The cross-linked insulating compound has the following properties;
tensile strength approx. 9 N/mm2
elongation at break approx. 150% Shore-A hardness approx. 88
oxygen index approx.40% The cross-link time for 1 mm thick stampings amounts to about three hours in the hot-water bath at 70"C, by adding the usual catalyst of 3% as a batch.
Claims (4)
1. A silane cross-linkable polymer mixture for the sheathing of electric and/or optical cables and wires, of the kind which contains copolymers of ethylene-vinyl acetate and ethylene-butyl acrylate, an organosilane grafted thereon for the cross-linking, a cross-linking catalyst, and a flame-retardant filling material, characterized in that the mixture additionally contains 3 to 15% by weight of the total amount of ethylene-vinyl acetate having a vinyl-acetate content of 50%, as well as 21 to 32% by weight of the total amount of aluminium hydroxide.
2. A polymer mixture as claimed in claim 1, characterized in that the content of organosilane-grafted copolymers of ethylene-vinyl acetate and ethylene-butyl acrylate and the cross-linking catalyst amounts to from 53 to 75% by weight of the total amount.
3. A polymer mixture as claimed in claim 1 or 2, characterized by the following composition: 145 parts by weight of flame-retardant, grafted copolymer of ethylene-vinyl acetate and ethylene-butyl acrylate and catalyst, 40 parts by weight of ethylene-vinyl acetate copolymer with 50% of vinyl acetate, and85 parts by weight of aluminium hydroxide.
4. A polymer mixture substantially as described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833344588 DE3344588C2 (en) | 1983-12-09 | 1983-12-09 | Polymer mixture for sheathing cables and wires |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8429596D0 GB8429596D0 (en) | 1985-01-03 |
| GB2151236A true GB2151236A (en) | 1985-07-17 |
| GB2151236B GB2151236B (en) | 1987-06-24 |
Family
ID=6216513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08429596A Expired GB2151236B (en) | 1983-12-09 | 1984-11-23 | Polymer sheathing material for cables and wires |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0148416A3 (en) |
| AU (1) | AU578256B2 (en) |
| BE (1) | BE903192A (en) |
| DE (1) | DE3344588C2 (en) |
| FR (1) | FR2556356B1 (en) |
| GB (1) | GB2151236B (en) |
| NO (1) | NO844852L (en) |
| NZ (1) | NZ210343A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7144941B2 (en) | 2002-10-16 | 2006-12-05 | Nabaltec Gmbh | Flame retardant polymer composition |
| CN103497411A (en) * | 2013-09-27 | 2014-01-08 | 杭州师范大学 | Flexible high-thermal-conductivity insulating polymer composite and preparation method thereof |
| US11512192B2 (en) | 2017-12-15 | 2022-11-29 | Byk-Chemie Gmbh | Thermoplastic composition having improved flame retardant properties |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8502928D0 (en) * | 1985-02-05 | 1985-03-06 | Bicc Plc | Cross-linkable compositions |
| US4732939A (en) * | 1986-01-20 | 1988-03-22 | Sumitomo Bakelite Company Limited | Flame-retardant olefinic resin compositions |
| DE3784486T2 (en) * | 1987-03-02 | 1993-07-08 | Sumitomo Bakelite Co | FLAME RETARDANT OLEFIN RESIN MIX. |
| DE3921442C2 (en) * | 1989-06-30 | 1995-06-01 | Kabelmetal Electro Gmbh | Empty cable for fiber optic cables |
| DE10342728B3 (en) * | 2003-09-16 | 2005-08-18 | Raumedic Ag | Filling tube, useful for filling medical products, e.g. blood into bags, comprises outer layer of polypropylene and inner layer of silane-crosslinked ethylene copolymer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2083481A (en) * | 1980-09-09 | 1982-03-24 | Nat Distillers Chem Corp | Flame retardant compositions |
| GB2083480A (en) * | 1980-09-09 | 1982-03-24 | Nat Distillers Chem Corp | Flame retardant compositions |
| GB2119387A (en) * | 1982-04-26 | 1983-11-16 | Nat Distillers Chem Corp | Flame retardant crosslinked polyolefin insulation material |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS518355A (en) * | 1974-07-11 | 1976-01-23 | Showa Electric Wire & Cable Co | KAKYOSEISOSEIBUTSU |
| DE3047269C2 (en) * | 1980-12-16 | 1983-08-04 | AEG-Telefunken Kabelwerke AG, Rheydt, 4050 Mönchengladbach | "Thermoplastic Polymer Mixture" |
| JPS58118828A (en) * | 1982-01-06 | 1983-07-15 | Showa Electric Wire & Cable Co Ltd | Preparation of flame-retardant crosslinked polyolefin molding |
| GB2149802B (en) * | 1983-11-16 | 1987-03-18 | Standard Telephones Cables Ltd | Oil resistant flame retardent ethylene polymer compositions |
-
1983
- 1983-12-09 DE DE19833344588 patent/DE3344588C2/en not_active Expired - Fee Related
-
1984
- 1984-11-23 GB GB08429596A patent/GB2151236B/en not_active Expired
- 1984-11-26 AU AU35861/84A patent/AU578256B2/en not_active Ceased
- 1984-11-27 NZ NZ21034384A patent/NZ210343A/en unknown
- 1984-12-04 EP EP84114762A patent/EP0148416A3/en not_active Withdrawn
- 1984-12-05 NO NO844852A patent/NO844852L/en unknown
- 1984-12-07 FR FR8418746A patent/FR2556356B1/en not_active Expired
-
1985
- 1985-09-06 BE BE2/60787A patent/BE903192A/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2083481A (en) * | 1980-09-09 | 1982-03-24 | Nat Distillers Chem Corp | Flame retardant compositions |
| GB2083480A (en) * | 1980-09-09 | 1982-03-24 | Nat Distillers Chem Corp | Flame retardant compositions |
| GB2119387A (en) * | 1982-04-26 | 1983-11-16 | Nat Distillers Chem Corp | Flame retardant crosslinked polyolefin insulation material |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7144941B2 (en) | 2002-10-16 | 2006-12-05 | Nabaltec Gmbh | Flame retardant polymer composition |
| CN103497411A (en) * | 2013-09-27 | 2014-01-08 | 杭州师范大学 | Flexible high-thermal-conductivity insulating polymer composite and preparation method thereof |
| CN103497411B (en) * | 2013-09-27 | 2016-04-13 | 杭州师范大学 | A kind of flexible high heat conductive insulating polymer composite and preparation method thereof |
| US11512192B2 (en) | 2017-12-15 | 2022-11-29 | Byk-Chemie Gmbh | Thermoplastic composition having improved flame retardant properties |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3344588A1 (en) | 1985-06-20 |
| EP0148416A2 (en) | 1985-07-17 |
| DE3344588C2 (en) | 1994-12-15 |
| FR2556356A1 (en) | 1985-06-14 |
| AU578256B2 (en) | 1988-10-20 |
| AU3586184A (en) | 1985-06-13 |
| BE903192A (en) | 1986-03-06 |
| NO844852L (en) | 1985-06-10 |
| GB8429596D0 (en) | 1985-01-03 |
| NZ210343A (en) | 1988-01-08 |
| GB2151236B (en) | 1987-06-24 |
| FR2556356B1 (en) | 1986-09-19 |
| EP0148416A3 (en) | 1985-08-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19931123 |