EP0054424A2
Expired / Lapsed
EP
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Thermoplastic polymer composition, products formed therefrom
Assignee: Lindsay and Williams Ltd
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Filing: 1981-12-14
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Granted: —
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Expires: 2001-12-14
Abstract
Abstract A fire resistant non-halogenated and flexible polymer composition comprises a polymer mixture with an inorganic filler. The polymer mixture comprises - as an elastomer component, an ethylene-copolymer or mixed polymerisate with a comonomer portion of at least 38% consisting of unsaturated ester comonomers, the elastomer being present in an amount by weight of least 50% of the polymer mixture, - as a plastomer component an ethylene-copolymer with an ethylene portion of at least 70%, the plastomer component being present in an amount by weight of at most 50% of the polymer mixture. The filler is a metal hydroxide used in an amount of 180 to 320% of the polymer mixture. The composition is particularly useful as sheathing for a cable. An extruder for processing the composition is also described.
Inventors
- 👤 Bartholomeus Dipl.-Ing. Ivanfy
- 👤 Hans-Anton Dipl.-Ing. Mayer
- 👤 Daljit Dipl.-Ing. Parmar
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 04:06
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; C; C08; C08K; C08K3/00; C08K3/01; C08K3/013; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L2203/00; C08L2203/20; C08L2203/202; C08L2205/00; C08L2205/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
136 words
A polymer composition comprising a thermoplastic polymer mixture based on ethylene polymers or copolymers, which is filled with inorganic fillers leading to fire-resistance and optionally containing further fillers and/or additives, characterised in that the polymer mixture comprises - as an elastomer component, an ethylene-copolymer or mixed polymerizate with a comonomer portion of at least 38% by weight consisting of unsaturated ester comonomers, the elastomer being present in an amount by weight of at least 50% of the polymer mixture, - as a plastomer component an ethylene-copolymer with an ethylene portion of at least 70% by weight. The plastomer component being present in an amount by weight of at most 50% of the polymer mixture, and in that the filler is a metal hydroxide in an amount by weight of 180 to 320% of the polymer mixture.
Claim 2
Dependent Claim
136 words
A polymer composition comprising a thermoplastic polymer mixture based on ethylene polymers or copolymers, which is filled with inorganic fillers leading to fire-resistance and optionally containing further fillers and/or additives, characterised in that the polymer mixture comprises - as an elastomer component, an ethylene-copolymer or mixed polymerizate with a comonomer portion of at least 38% by weight consisting of unsaturated ester comonomers, the elastomer being present in an amount by weight of at least 50% of the polymer mixture, - as a plastomer component an ethylene-copolymer with an ethylene portion of at least 70% by weight. The plastomer component being present in an amount by weight of at most 50% of the polymer mixture, and in that the filler is a metal hydroxide in an amount by weight of 180 to 320% of the polymer mixture.
Claim 3
Dependent Claim
20 words
Polymer composition according to claim 1 characterised in that the comonomer portion of the elastomer component is a vinyl acetate.
Claim 4
Dependent Claim
28 words
Polymer composition as claimed in any one of claims 1 to 3 wherein the comonomer portion of the plastomer component is vinyl acetate, ethyl acrylate or butyl acrylate.
Claim 5
Dependent Claim
41 words
Polymer composition according to any one of claims 1 to 3, characterised in that in order to achieve a high-strength mixture which can also be extruded without plasticizer, the elastomer component amounts to 60-80% of the weight of the polymer mixture.
Claim 6
Dependent Claim
18 words
A cable having sheathing or insulation produced from the composition of any one of claims 1 to 4.
Claim 7
Dependent Claim
21 words
An elongate product or a flat product formed from the composition as claimed in any one of claims 1 to 4.
Claim 8
Dependent Claim
12 words
A product as claimed in claim 6 which is a sectional member.
Claim 9
Dependent Claim
15 words
A product as claimed in claim 6 which is a floor covering, e.g. a tile.
Claim 10
Dependent Claim
75 words
Extruder for processing a mixture according to one of claims 1 to 4 characterised by the use of a screw with the following features:- a feed zone having a progressive core with a length of 7-17D, preferably 10-15D (D equals diameter of the screw), with a channel depth of 0.08-0.19D for D < 90 mm or 0.01D to 0.24D for D > 90 mm with a compression of 1:1.05 to 1:1.7 preferably. 1:1.2 to 1:1.5,
Claim 11
Dependent Claim
39 words
- a low-compression metering zone with a length of 4-13D, preferably 5-8D, with a channel depth of 0.08-0.18 for D 4 90 mm or 0.1D-0.22D for D > 90 mm, with a compression of 1:1 to 1:1.2, preferably 1:1.
Claim 12
Dependent Claim
39 words
- a low-compression metering zone with a length of 4-13D, preferably 5-8D, with a channel depth of 0.08-0.18 for D 4 90 mm or 0.1D-0.22D for D > 90 mm, with a compression of 1:1 to 1:1.2, preferably 1:1.
References Cited (Backward Citations)
No citation records indexed.
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