DE1640160A1 - Insulated electrical wire and a process for its manufacture - Google Patents

Description

This invention relates to an improved wireline for high temperatures and especially on an improved wire line for high temperatures, which is a heat-resistant, thermoset insulating layer and an inorganic fibrous layer provided with a heat-resistant impregnation agent, the fibrous layer concentric around the insulating layer is arranged around and the corresponding layers duroh their interaction to increase the service life of the

009837/1700

Patent attorney DipL-ing. Martin Licht, Dipl.-Wirfsch.-Ing. Axel Hqnimann, Dipl.-Phys. Sebastian Herrmann
MÖNCHEN 2, THEREStENSTRASSE 33 · T «!« Fon. 292102 Teligrqitim-AdrMui LippHf / MPnchin

Bonkv »rbindunB» ni Deutschs Bank AO, Branch · Munich, Dtp.-Kain Vfktualienmarkt, account no. 716728 Boy ·! ·. Vveinibanfc MOndien, Zwclgit Oikar-von-MHItr-Rine, account no. 882475 Poifichtck-Konloi Münchan No. 1i3397

Oppfneu.rMro. PATENT ADVOCATE DR. REINHOLD SCHMIDT

• Conduct the line as it was determined by accelerated heat aging tests.

The development of electrically controlled or actuated devices for high temperatures, such as water heaters, Ovens, stoves and the like, required in the electrical industry insulated electrical cables that can withstand such high temperatures for a long time and have the same service life like the corresponding devices or fixtures

in which they are. So far one used in the electrical industry, impregnated asbestos insulation for this purpose, which met the condition of a reasonable cost. Such an impregnated asbestos insulation, in the art below known as Type AF, has all the essentials. required properties with regard to fire resistance and heat resistance except for acceptable resistance to moisture, which often leads to defects in devices that are in in a humid "environment.

From the heat-resistant, polymeric, insulating and in Some of the materials available to the technology can be used and retained at an economically viable cost in addition, their physical and electrical properties even after prolonged operation at high temperatures. Durable or "intertwined" polyolefin compounds are particularly suitable as insulation at high temperatures, but they fail under extreme heat loads,

009837/17100

BATHROOM ORIGINAL-

around 150 ° G, as required by industry standards or insurance regulations. Durable or "interwoven" polyolefins are substances that are normally flammable, such as the vertical flammability test of insurance companies, further detailed on pages 17 - 19 of the insurance regulations "Thermoplastic, Insulated Wires", TJl 83, 3rd edition, 1948, - is fixed. It is known that certain refractory additives can be added to such preserved or "intertwined" polyolefin compounds. However, difficulties arise concerning the retention like the highly desirable properties of such materials at very high temperatures ..

It is an object of the present invention to provide a wire line to be provided for high temperatures, especially as wiring means in devices or devices, and made of a durable, insulating polyolefin * Connection and an external asbestos covering, which is with a hit zebe. permanent, thermoplastic, halogenated, polymeric agent is impregnated, the physical and electrical properties of the preserved polyolefin in cooperation with the impregnated, enveloping Asbestos covering can be reinforced and lead to a composite wire line for high temperatures, which is extraordinary is heat-resistant and flame-retardant.

The present invention is also intended to provide a method for

§837 / 1700

Making a fairly flame retardant, insulated, high temperature electrical conduit that will deliver out of one preserved polyolefin in the form of a concentric around an elongated metallic conductor arranged insulating layer and a fibrous, concentric around the insulating layer arranged layer, wherein this fibrous layer consists of an inorganic, fibrous material and a heat-resistant, thermoplastic, halogenated polymeric impregnating agent intended for this purpose.

In accordance with the underlying objects, the invention is intended an insulated electrical line or a cable for high temperatures deliver that from an elongated metallic Ladder; from a normally flammable, durable molded insulation that forms the metallic conductor surrounds, the insulation preferably being a durable ethylene-polymer compound, which is usually a solid Contains ethylene polymer and a preservative therefor, which makes the bond durable or intertwined will; and consists of an inorganic impregnated fibrous layer on top of the insulation, the impregnating agent is a usually solid halogenated polymeric material, creating a composite wire line, which is particularly suitable for use at high temperatures Another object of this invention is to provide a Manufacturing process for a flame-retardant, electrical Cable or the like suitable for high temperatures

ooam / uoö

must be indicated which is extremely heat-resistant and wherein a generally flammable, durable polyolefin compound is molded over an elongated metallic conductor.

The heat-resistant, thermosetting or thermosetting substances mentioned herein are preferably durable, usually solid, homopolymeric and heteropolymeric substances which are obtained by polymerization and interpolymerization of mono-olefins, preferably from "Ci- to" G _t - "'- mono- 01efins such as ethylene, propylene, butylenes, e.g. butylene-1 and butylene -2, and pentenes. The preferred olefins consist of polyethylenes which are converted to homopolymeric and heteropolymeric substances by polymerization of ethylene These polymeric materials are generally solid, although liquid polyethylene is not excluded should be, and are produced by the polymerization of ethylene at high temperatures and pressures. The molecular weights of these polymeric materials can range from 2,000 to 30,000 or higher for solid polyethylene. Other polyethylenes with different molecular weights "are described by Lawton in" Industrial and Engineering Chemistry ", 46, pages 1702-1709, (1954).

009137/1 TOO

-which fall within the scope of this invention is located in "Modern Plastics", Vol. 35, Fr. 1, (Sept. 1955), page 85 ff. Other polyethylenes useful in the context of this invention include the spatially regular polymeric substances discovered by ÜTatta and Ziegler. Explanations relating to this follow below.

Examples of commercially available polyethylenes that can be used in this invention include the following: Bakelite "DYNH", "DE", "DED" and "DFD" polyethylenes; the Phillips "Marlex" polyethylene; and the du Pont "Alathon" polyethylene and the like

Preferred heteropolymeric ethylenes used in the scope of this invention are the polymeric ethylenes and the lighter olefins (ie C ₁ to C 1 -), preferably the lighter α-olefins, for example propylene and 1-butene, but also comonomers such as vinyl acetate . Among the preferred heteropolymeric materials used in accordance with the present invention are materials well known in the art, such as normal strength elastomers composed of both high density and low density polyethylenes and polypropylenes, preferably 15 to 85 mole percent Propylene and generally at least 15 mole percent ethylene. In the definition of the ethylene-propylene polymers of this invention, the 'suitable, normally solid, elastomers known in the art as ethylene

00983771700

164016 Q

Propylene rubbers are known, included, included the ethylene-propylene terpolymers, which "Mooney" 'viscosity s (8 min at about 100 ° G) of at least 25 and one Have operating viscosity "up to 80 or more".

Among the polyethylenes that are "especially useful for this invention If the underlying processes are useful, those of Ziegler and Natta in their fundamental work also belong in the synthesis of spatially regular poly-alpha-olefins developed polyethylenes which are well known in the art and about which there are numerous publications such as e.g .: Ziegler, "fuel chemistry", 40.209. (1959); Ziegler, "Angewandte Chemie", 67, 426 (1955); Natta, "Rubber and Plastic Age ", 42, 53 (1961); and Natta" Rubber and Plastie Age ", 38, 495, (1957). Other ethylene-propylene polymers useful in this invention have been described by Amberg," Industrial and Energineering Chemistry ", 53» 368, (1961). In the definition of the preferred ethylene-propylene polymers its terpolymers are also included. Among the be ' Preferred terpolymers are those of ethylene, propylene and a non-conjugated diene. A detailed description of polyethylenes used in this invention are useful, including ethylene-propylene polymers and terpolymers, located in "Symposium of Öynthetie Elastomers from Petroleum Hydrocarbons, "Division Of Petroleum Chemistry, American Chemical Society, Washington * B.C., Vol. 6 * Sept. 1961.

009837/1700

The insulating compounds on which this invention is based can be preserved or intertwined by any desired or common practice, including Irradiations, applies. However, chemical agents are generally preferred. The interweaving can e.g. can be achieved in that a small amount of a -about 0.1 to 10 percent by weight of the polymeric material to be interlaced, making up, suitable, causing the interweaving By means of, preferably one, the free radius

£. kale creates, admits. The interweaving is then carried out by heating to the appropriate interlacing temperatures. Although the special one entanglements effecting agents themselves are not critical, they should be selected so that they are non-reactive in a given composition during any thermal process step. Although in general any conventional, state-of-the-art interlacing means for interlacing polymeric fabrics from the found the type underlying this invention to be useful

"" there are some preferred interlacing agents, such as the organic peroxides, especially of the general type RO-OH or ROOH ¹ , where the organic radicals R and R 'are selected from the group consisting of alkyls, cycloalkyls, aryls, aralkyls, acycles, alkenyl © , Cycloalkenyls and the like, and can be selected from such other functional groups which neither make the peroxide group dangerously unstable nor so stable that they do not under the preferred heating conditions

, 009017/1700

reacted. Hence, E and R 'can also, just like at least a substituent in the peroxide molecule, a halogen, a Hydroxyl, an alkoxy, an aryloxy, a carboxy, a peroxy and an ITitro group or the like. Be. Preferred Organic peroxides are those "where K and R 'are always a Hydrocarbon radical is which one with every oxygen atom tertiary carbon atom connected to the peroxide group and wherein the peroxide also has a decomposition temperature of more than 130.degree. Therefore includes a Group of preferred peroxides, the aliphatic bis (tertiary alkyl peroxy) Hydrocarbons, which at temperatures Decompose above 150 ° C, about 2,5-bis- (tert-butylperoxy-2,5-dimethyl) -hexane and 2,5-bis- (tert-butylperoxy-2,5-dimethyl) .- ■■ Hexyn. Another group of preferred peroxides are those discussed in U.S. Patent No. 3,079,370, disclosed in U.S. Patent No. 3,079,370, for example should be noted in this description. Among the preferred Peroxides became one of the things that were special for this invention found suitable, namely the di-alpha-cumyl-peroxide (hereinafter called dicumyl peroxide). This preferred peroxide can generally be used in a proportion between 0.1 and 10 percent by weight, preferably with a proportion of about 0.5 to 10 percent by weight, based on that to be interwoven polymeric substance.

The insulating, interwoven and underlying this invention Substances can also contain small amounts, for example up to a few percent, of antioxidants, their

ORIGfNAL (jjSPECTEP

• Selection in terms of a suitable or conventional procedure is made. Among the common antioxidants, which can be used in the practice of this invention are the Hydrochi-ηοη, -ether, various substituted hydroquinones, hydrocarbon substituted arylamines and various aniline derivatives, Tolyl-amines present in wax form, various substituted naphthyl amines, substituted phenylene diamines, various substituted phenol and phenol derivative compounds

fertilize, acetone-phenylamines and diphenylamine reaction products,

■ Including the hydroquinolines and cerium polymerize hydroquinolines and the like, which are well known in the art. In general, the antioxidants preferably used in this invention include the polymeric reaction products of acetone and aniline (such as Aminox and BLE) and the polymeric reaction products of acetone and diphenylamine (such as Agerite Resin D and Flectol H). These ketone arylamine-derived polymers generally include polymerized trimethyl dihydroquinolines in the W art.

Contain the insulating materials on which this invention is based furthermore fillers as required or desired, Dyes, pigments, plasticizers, stabilizers, processing aids, dispersants, additionally acting Substances and the like. In general, the additives to be added to the substances on which this invention is based should be selected ■ be that they have the electrical properties of the ultimate

00 98 37/1700

0-

entangled polymeric compounds obtained are not disadvantageous These substances can furthermore, as usual, be any suitable or conventional filler material included, including those commonly used in technology and treated derivatives thereof. The proportions should be in conventional framework. "" -.--

In the method underlying this invention, the normal Flammable, interwoven polyolefin compound, which is preferably a peroxide, interwoven polyethylene compound is, in the conventional manner, an elongated, metallic, electrical conductor molded and made durable on it in the usual way. The longer me-_ metallic. Conductors can be any from a single fiber metallic, conductive material or of several such Consist of strands which, in some customary way, about twisted, intertwined or the like., Are arranged. That specific conductive material can generally be any common conductive metal, up to and including The temperature that decomposes the insulation retains its electrical and mechanical properties. Therefore, the Conductors made of copper, aluminum, steel or the corresponding alloys or appropriately coated metal fibers or the like. Preferred metal lines consist of mono- or multi-fiber copper treads, a ^ finally from with other metals, such as Zinni silver or Nickel, coated copper wires. In a preferred

0011 * 7/1700,

BADORlQiNAL:

Modified embodiment of this invention, the metallic conductor is covered with removable material before the
interwoven insulating fabric is molded onto it. As a result, the attached insulation can easily be pulled off the metallic line.

In the process on which this invention is based, the molding and preservation of the polyolefin insulation is followed by the application of an inorganic, fibrous covering layer or a corresponding layer which surrounds the preserved insulation, the inorganic fibrous layer being provided with a heat-resistant, thermoplastic impregnation agent. The inorganic, fibrous material can be made from
mineral wool, glass wool, asbestos and the like. exist. In a preferred embodiment of this invention, however, the inorganic fibrous covering consists essentially of asbestos wool, which should expediently consist of asbestos in accordance with the insurance regulations. The asbestos can be in
be woven or non-woven form provided ₌ and connected in common, or an appropriate way with the underlying insulation, asbestos A nonwoven ¹ is usually secured by a conventional web-carding machine. That
Heat-resistant thermoplastic impregnation agent preferably consists of a halogen! he throws polymeric sfeff. Examples of such halogenated polymeric substances are chlorinated »
fluorinated; imbrominated elastomers waä polymers *
lich about C ^ loropreni-i ^ olyiiiereii, filter tones

BADORfGINAL

kidneys, chlorinated polyethylenes, polyvinyl chloride, chlorinated Rubber and the like. In the case of chlorinated polymers, these preferably contain about 30 to 70 percent by weight Chlorine. Other halogenated polymers should contain a halogen in the same weight fraction, if so as Chlorine equivalent is calculated, i.e. every gram atom of halogen in the molecule is converted into a gram atom of chlorine in a polymer which is hypothetically substituted by chlorine. The halogenated Polymers can either by. Polymerization of halogen-containing monomers or by subsequent halogenation other natural or synthetic polymeric substances will. Therefore, polymerization or copolymerization provides a polyvinyl halogen compound and also the halogenation of a synthetic polymer such as polyethylene, or a natural polymer such as rubber one in this Halogenated polymer useful in the invention. The halogenated polymers used in this invention are furthermore characterized by a high molecular weight, heat resistance and thermoplastic behavior. Under higher Molecular weights are to be understood in this case as molecular weights of more than 5000, including all im Commercially available higher molecular weights for each polymeric materials concerned. The choice for the im individual molecular weight range to be used is generally determined by the requirements of the process, such as solubility, if applicable, or viscosity and the like, determined. In general, the choice of these substances is determined by those in this Technically recognized standards as practiced by experts-fc

009837/1700

-H-

be determined. The requirement for heat resistance requires a polymeric substance for this invention which, in interaction with the inorganic, fibrous material, has not yet melted at 150 ° C, and which furthermore does not cause any destruction, decomposition, depolymerization or dehalogenation at this temperature. or shows signs of dehydrohalogenation. Under the determination that the halognierte polymer at 150 C is not yet to be melted is to be understood that in this invention the underlying wireline% is high to observe at the same temperature no dripping of the polymerized material.

Although certain halogenated polymers which can be used in the practice of this invention are to be described in detail, it should be understood that these explanations are not intended to set limits and that the range of halogenated polymers which can be used is indicated by the description given above and definition is established. One . ^B places useful, halogenated polymers provide the PoIyvinyl-halogen compounds, the polyvinyl chlorides are elnschliesslich, wherein the polymers of vinyl chloride, the Vinyldichlorids, of vinylidene chloride and combinations thereof are included. Polyvinyl-halogen compounds which are useful in the practice of this invention can also include the refractory homopolymers and interpolymers of a vinyl-halogen compound with interpolymerizable vinylidene monomers such as vinyl esters of one

»09837/1700 ^&

'- ■' - ■. BATH ORIGINAL

■ basic organic acids such as vinyl acetate, vinyl benzoate, Vinyl stearate and the like; include; or acrylonitrile, methacrylonitrile, Alkyl acrylate esters such as methyl aerylate, butyl acrylate and the like; or the corresponding alkyl methacrylate Ester; Dialkyl esters of alpha, beta-unsaturated dibasic organic acids like. Dibutyl pumarate, dimethyl maleate and the like. Generally, wherever interpolymers use clay Chlorine substituted vinyl monomers can be used with this have such a weight fraction of vinyl chloride that the approximate weight fraction of chlorine in the interpolymer in the above area is retained. The polyvinyl halogen compound can by solution-emulsion or suspension polymerisation getting produced.

As discussed above, refractory post-halogenated polymers are also useful in this invention. Halogenated by-under such synthetic polymers are the resistant plants _t 's, halogenated en olefin polymers which are prepared by any of the usual technique for the halogenation of the olefin Polynie're, such as halogenation of the polymer in solution or aqueous dispersion, ^ · can. Generally, for economic reasons, the halogenated olefin polymer is a chlorinated olefin polymer. The halogenated or, in general, chlorinated polymer may or may not be easier to incorporate into a Hontoppl ^ mter. Alpha-olefins, such as ethylene , pro ^ ylene "Bttten-t" and the like; Interpolymers are now two or more m

tf öö

Alpha olefins; Interpolymers in which one or more interpolymerizable yinylidene monomers such as styrene and its homologues, including alpha-methyl-styrene, the Ring alkyl styrene, polymerizing Mng halogen styrene and the like are; alpha, beta-unsaturated monocarboxylic acids and their derivatives such as acrylic acid, methacrylic acid, alkyl acrylate esters such as methyl acrylate, butyl acrylate and the like; the corresponding alkyl methacrylate esters, acrylonitrile, Methacrylonitrile, acrylamide and methacrylamide; Vinyl halogen "compounds; Vinylidene halogen compounds; Vinyl ester of monobasic organic acids such as vinyl acetate, vinyl benzoate, vinyl stearate and the like; conjugated 1,5-dienes such as butadiene, Isoprene, chloroprene and the like., And similar substances, Nach of halogenation, the polymer should preferably have a molecular weight from at least 5,000 to 6,000. Under the usable and more economical, heat-resistant, halogenated Polyolefins are the heat-resistant, chlorinated and chlorosulfonated polyethylene.

Another group of useful halogenated refractory thermoplastic polymers includes the halogenated natural and synthetic rubbers. Typical heat-resistant, chlorinated synthetic rubbers, which may be useful in the practice of this invention, SAre heat-resistant, chlorinated butadiene-styrene rubber, chlorinated polyisoprene, chlorinated polychloroprene, chlorinated neoprene, chlorinated nitrile Kautsehuk and the like. The process water ⁼

009837/1700 ■ -: ■■ bad ame «m ^eim " -

The availability of such chlorinated elastomers in the practice of this invention is, of course, determined by the requirement for heat resistance, which those skilled in the art believe is a function of molecular weight, degree of chlorination, and the like. In a preferred and modified embodiment of this invention, the halogenated elastomer is a halogenated natural rubber and typically a chlorinated natural rubber. Of the chlorinated rubbers which, if any, useful in the practice of this invention are those obtained by the chlorination of dry, dissolved, natural rubber and, in certain cases, those obtained by the chlorination of gum milk juices. Chlorination in solution means the presence of chlorine or a chlorinating agent in an organic solution or the use of liquid chlorine itself Chlorinated rubbers are generally odorless, tasteless, white, finely divided or fibrous products that are commercially available in many different viscosity grades and degrees of chlorination. Of the commercially available chlorinated rubbers, that of Hercules is Powder Company made "Parlon" and "Tornesit". to mention. Selection of any egg-nes particularly suitable, chlorinated rubber depends on the desired and special procedural requirements and the process temperature corresponding viscosity range and the gewünsch · * th chlorination from _s where the material otherwise how

009837/1700 bath

^% ΐ% Ci ^ m

stated above should be heat-resistant. A detailed one Description of natural, chlorinated rubbers can be found in Fisher, "Chemistry of Natural and Synthetic Rubbers", Few York (1957), 183-187.

The heat-resistant, thermoplastic, halogenated polymeric substances in this "invention can also be used insofar as this is necessary or desirable particularly halogenated polymeric stabilizers, processing aids, dispersants, and the like. Contain. In general, these additives should be chosen so that they have the electrical properties for high temperatures suitable wire lines of this invention are not disadvantageous influence. The filling materials that may be contained in the substances on which this invention is based, can use any suitable or common fillers, including the fillers commonly used in the art and treated derivatives thereof. The quantities can be kept within the conventional or expedient framework. These additives should of course also be considered according to their heat resistance - up to 150 C- can be selected. Further should be useful as stabilizers for the chlorinated, refractory thermoplastic polymers of this invention or Common stabilizers, for chlorinated polymers such as basic lead silicate, lead phthalate, complex lead chlorosilicates, Lead oxide and the like., Can be used.

0098 377 1700.

BAD ORfGiNAL

The heat-resistant, thermoplastic, chlorinated polymer ■ can with the inorganic, fibrous layer on any appropriate ways, including enamel impregnation and solution impregnation. If the solution is impregnated, So, of course, the solvent is used according to the specific solubility of the individual halogenated polymer chosen. In the case of chlorinated rubbers the appropriate solvent is preferably selected from those solvents in which chlorinated rubber is soluble * Solvents include aromatic solvents such as benzene and its honiologists, halogenated hydrocarbon solvents Such as chloroform, carbon tetrachloride, trichlorethylene, and the like., Esters such as ethyl and Amyl acetate and the like. Preferred aromatic solvents for a chlorinated rubber impregnant include benzene, loluene, xylene, and the like, as well as mixtures thereof.

example 1

A typical, according to this invention, interwoven, insulating compound consists of polyethylene with a weight fraction of $ 68.69 >> of ^ polymerized 1,2-dihydro-2,2,4-trimethylquinoline as an antioxidant with a weight fraction of 1- , 37th $ "from McumylperOxydm.it a weight fraction of 2.44 ° i and of finely divided carbon as filler in a weight percentage · of 27"50>% ..

00 9837/170 0

Subject, the above information may include: the anti-oxidant with a weight fraction of up to $ 2, based on the polyethylene; the dicumyl peroxide with a weight fraction between 1 and 10 #, based on the polyethylene; and the filler with a weight fraction of up to almost TOO fo, based on the polyethylene, the range between 20 and 50 fo being generally preferred for this. A thin layer of the above material is conventionally molded onto an elongated metallic conductor, the optional

™ previously provided with a removable or removable covering usually about a preferred embodiment of this invention with separating paper from about 0.05Zmm / thickness. In general, the thickness is the interwoven polyethylene layer on cables with 20-1OAWG expediently about 0.5Zmm7 · The insulated line, which from the wire and the thin, unwoven, molded, insulating material ", is then preferably passed through a continuously vulcanizing, conventional device,

fc, for example, a steam-pressure system, whereby the insulation is made durable .and is intertwined. Then the insulating wire covered with asbestos as heat-resistant, inorganic wool. The asbestos, the purposeful orphan the insurance regulations' sufficient, can with a conventional Tissue carding machine around the insulation.

009837/1700

16A0160

Example 2

The asbestos covering is followed by impregnation this covering with a solution containing chlorinated rubber. Which is preferable in the practical application of this Invention used and chlorinated rubber containing solution is used in the cold state and consists of about 10 percent by weight, based on the solution, of heat-resistant, chlorinated rubber dissolved in toluene-xylene oil with a related chlorine content of about 55 percent by weight.

The concentration of the chlorinated rubber will generally be determined by the requirements of the process employed certainly. Although quite a thin hole with about 8 to 20 percent by weight is preferred, higher or lower concentrations are permissible and the polymer can even as hot. Melt can be used. After applying the solution containing chlorinated rubber becomes the solvent in any convenient way, such as by passing the impregnated wireline through an oven, removed again.

To determine the comparable properties of this invention prepared as defined and suitable for high temperature wires were Runaway a series of experiments leads "Some results are ssuaammengegtellt in table form and explained below with reference to the indicated in Table I. Samples * η t * ηλ q

Table I.

sample 1 2 3 4th VJl 6th Wire (AWG)
(amerο wire gauge) 16 16 16 1-6 16 18th
i Distribution of lines 26 /
010
_ 19 /
0117T 19 /
0117T 19 /
0117B 19 /
0117B 19th
0092 Paper separators * 0.05 0.05 0.05 0.05 0.05 Insulation (Tj / mm / - 0.5 0.5 0.5 0, 5 Impregnated As- ^;
best / mm / (2); 0.7 * 0.3 0.3 ι 0.3 |

* Sample 1, which essentially corresponds to a heat-resistant wire line of the type KF , has an acetyl cellulose separating layer and was provided with a hot, molten impregnation agent,

(1) With the exception of sample 1, the insulation is the preserved, molded material according to example 1.

(2) In accordance with the insurance regulations, equally rough asbestos, which (with the exception of sample 1) impregnates with the preferred impregnating agent solution according to example 2 became.

Table II lists the physical properties of wireline samples corresponding to this invention (samples 2 and 4), after an aging process in the oven at 158 ° C, compared with Wireline samples which have the durable insulation, not the impregnated asbestos layer (samples 3 and 5),

00983771700

BATH ORIGINAL

Table II

Accelerated heat aging in an air oven at 158O

Zugfe st./Ss/cm?7 5fr. 2 5 171 I. 7th page H6j ! 151 Ul 30th 45 60 90 ι % Ret. 156 96 ρ 69 10 93 ϊ 84 1 50 108 102 34 66 I. i Extensibility 330 i 95 270 ^! 270 96 69 66 60 42 y f
Sample 2 1> Ret. 340 85 1300 79 68 260 150 38 50 ■ 13 - I. I. Tensile strength. ZKü / cm? 7 ί 77 77 44 11th 15th 4th SS Ret. 180 160 154 146 151 99 113 0 i
I sample 3
I. Extensibility 89 86 81 73 55 63 0 ι $ Ret. . 400 320 290 240 180 29 25th 0 I. Zugfe st. zSp / em? 7 80 I 73 _L3_5_ 162 60 45 7th 6th i 0 [Sample 4 $ Ret. 146 \ 92 91 136 102 : 94 85 \ 60. ί
- - Extensibility 270 <290 93 70 64 58 ■ 4 % Ret. 340 ΐ 79 74 250 90 50 25th i 13 Tensile strength / kg / cm? 7 i 74 27 15th J 4- J Sample 5 2LRe t. 178 156 117 106 j 97 ■ 0 Extensibility 87 65 60 i 55 0 $ Ret. 390 250 250 HO ; 25th 0 64 36 I 6 6th 1
■ 0

Table II shows very clearly the greater increase in service life of wires made in accordance with this invention (Samples 2 and 4) compared with Samples 3 and 5 after 90 days Aging in an air oven at 158 ° C failed completely. TJm that novel interaction of the durable polyolefin insulation and the impregnated asbestos layer, sample 7 is used, which is essentially the same as Sample 2, however

009837/1700

- ^u - 1840160

a cellulose acetate interlayer between the. durable insulation and the impregnated asbesffoelag. Me sample 7 failed completely after 90 days of aging in an air oven at 158 ° C (the retention of elongation and tensile strength was the same as Hull), and thus clearly referred to the excellent aging properties of samples 2 and 4, which are based on the interaction or synergy the impregnated asbestos layer and the durable insulation. M up ground this novel, aussergewö'hnlichen cooperation received zugrundeliegenden.hitzefesten this invention wire leads a life that, as determined by accelerated heat aging tests of the above type is significantly larger than the life of a wire that only the insulating layer without the fibrous layer.

Table III shows further results from wireline, the correspond to sample 2 of table I. Those shown in Table III Data represent a summary of tests carried out in the insurance laboratory on the Sample and are from report no. 64M 2968 of 3.1.1965 . taken. All of the »tests listed below were in compliance made with the insurance regulations.

009837/1700

Table III

1. Physical properties:

* - ■ original
lich Air oven
15 days at
1580 C-- Shooting furnace
52 h at
127 ° 0 'Tensile strength / Κρ / cm? / 140 148-b 131 [Retained ok 105 Γ 93 Extensibility J & 265 220-. ! 260 [Retained $ 83 j 98

2. Corrosion of the pipe ? No signs of corrosion after an aging process of 90 days at 158 ° C in the shooting furnace or in the air furnace «

3 » flexibility ; There were no bites after the sample had been aged for 90 days at 158 C in a shooting furnace or air furnace by an American. 5X test mandrel was wound.

4. Dripping off of the material : after 1 hour at 150 ° 0 nothing noticeable.

5 · Cold bending: When winding on a 6mm spindle at minus 10 0, no cracks were found.

6. Horizontal flame test : OK.

7. Compressive stress: Flat plate against a 20mm spindle

Vulcanized asbestos A. 410 Kp Type AF Mfr. B. 372 Kp Type AF Mfr. G 340 Kp Type AF Mfr. 395 Kp

8. scraping test ; With a blunt edge

00083771700

Table III (port setting)

Vulcanized asbestos A. 269 Repetitions \ Type Al Mfr. B. 1U Jl ^] Type A? Mfr. G 120 11 ^! Type A? Mfr. 20? Il

9 Dielectric strength : (without dimensions)

a) 5X spindle, covered with a film; at room temperature:

after 90 days of aging at 158 ° C, measured at room temperature:

at 150 ° C:

after 90 days of aging at 158 ° G; measured at 150 ° C:

b) Bent at right angles, covered with a film;

at 150 - C:

> o

after 90 days of aging at 158 G, measured at 150 ° C:

c) Xn water at room temperature:

d) Covered with a straight sheet:

TO. Insulation resistance: dry on copper braid; at room temperature:

after 7 days of aging at 150 ° G, measured at 150 ° 0:

11 583

1 407 3 000

1. 150 3,000

1 233 MSL 9 250 12th 833 1 529 3.51

On the basis of the data summarized in Table III above, it is readily apparent to those skilled in the art that the wire line corresponding to this invention complies with the insurance regulations in order to be regarded as Mt ζ e-resistant wire line with a

009837/4700

Operating temperature up to 150 ° C and an operating voltage up to 3OOT to be able to apply.

Further evaluations of the underlying this invention Wiring lines are shown in! Table IT. '

009837/1700

Table IV

1640760

Dielectric studies with 150OV, one minute
Spindles and U-shaped bent specimens with a 12mm
Locker", 2080 Sample 1 Kp U-shape,
bent Sample 6 20,000 long. Then switch off;
Polie are covered _e / KT / Sample ι X • 4.9 160 6mm
Locker. 5.0 12mm 6mm
Locker. Locker. 25,000 12mm 6mm
Spind.Sj> ind U-för
born Aging Test ™
Days temp temp 1.4 250 5.2 1.1 10.0 10.0 2,000 U-shaped.
bent 11.3 9.9 11.2 RT ~ 1 .5 400 1.2 in order 1.2 9.5 9.4 110 ■ 1t.Ο 1.9 1.6 2.0 30 158 rt 1.3 . 1.4 1.2 9.1 9.0 ΙΟ..O 1.1 1.1 1.2 60 158 RT 6th 1.3 7.2 7.9 80 9.2 1.0, 9 90 158 RT 4.0 10 6.0 40 7.4 1.1 15th 4.4 .9 10.0 8.9 25th 10.5 10.5 10.8 1.3 1.1 1.1 8.9 10.2 11.7 KV 10.1 3.0 1.5 2.4 ^ 30 158 150 1.2 1.Ί 1.2 8.7 10.7 118 Kp 10.5 1.0 1.2 1.3 60 158 150 Insulation resistance, 1.0 8.2 1.5 ' 343 10.8 1.0 .7 .8th 90 158 150 RT dry on copper braid, in H. 53.7 10.5 / I ₁ 1000 pt. 30 158 rt «Eht 60 158 RT 90 158 RT 30 158 150 60 158 150 90 15fl 150 ^ Dielectric
Γ 2 pt. H ₂ O Langeames To * -
squeeze together;
3mm spindle 4.8 KV Scraping,
Käfifianker; 127 Aaer. "Inches-
T50 grit ^w -
Sandpa_gier 24911 Vertical
Inflammation8-
test 30.2 ■ - 180,000 ι. "too 102 0 22nd .04 0 10.4 KV 147 Kp 646 70.5 * eht

009837/1700

ORIGINAL iNSPECTED

Table IV (continued)

Horizontal
Inflammatory
test in order okay ^ in order i particle no no no 50mm cable
wave about
5 kp 277 _
1109 1158 50mm tape ßiu / I 16.4 \ 10.2 9.3

Upon further investigation on the one corresponding to this invention Wire line was found to have an extraordinary resistance to moisture, compared to the conventional wireline of the general Tap AF, which corresponds to sample 1. Furthermore, the Operating condition simulating tests, with the wire lines according to this invention being subjected to repetitive cycles were found, as they correspond to normal furnace operation, that these wire lines after 250,000 cycles remained intact and operational while those of the Sample 1 and prior art wire leads for high temperatures consistently after 30,000 to 35,000 cycles failed.

The drawing shows a preferred embodiment of this Invention, namely a flame retardant, insulated, heat-resistant Wire line consisting of a multi-core metallic Line 1, a paper envelope 2, an interwoven,

909837/1700 '

molded polyolefin insulation 3 and a non-woven asbestos covering 4 * with a heat-resistant, thermoplastic, halogenated polymer of higher molecular weight is impregnated.

While this invention has been described with reference to specific embodiments and modifications, it should be noted that that many changes and modifications are conceivable without departing from the scope of this invention.

00 9837/1700

Claims (10)

Pat e η t an s ρ rüch e ~ 1. Insulated electrical line, characterized by a elongated metallic conductor and a heat-resistant, heat-cured, insulating, concentric around the Conductor-arranged layer, this insulating layer being made from a durable, normally solid, ethylene polymer which in turn consists of a fibrous, inorganic layer covered with a heat-resistant, chlorinated, polymeric, impregnating agent is impregnated, is surrounded concentrically, creating a heat-resistant Wire line for high temperatures is created, the service life of which can be determined by accelerated heat aging is larger than that of a wire line, which is this insulating layer, but not the fibrous layer. 009837/1700 Patent attorneys Dipl.-Ing. Martin Licht, Dipl.-Wirtsch.-Ing. Axel Hansmann, Dipl.-Phys. Sebastian Herrmann MÖNCHEN 2, THERESIENSTRASSE 33 · Telephone: 2? 2102 · Telegram address: Lipafli / Munich Bank details: Deutsche Bank AG, Munich branch, Viktualienmarkt depot, Konlo-Nr. 716728 Bayer. Vereinsbank Munich, branch. Oskar-von-Miller-Rina, account no. 882495 Postichedc-Konlos monks No. 163397 OppenauerBOroi PATENT ADVOCATE DR. REINHOLD SCHMIDT 2. Heat-resistant wire 1 line according to claim. 1, characterized in t that the insulating layer consists of a preserved, normally solid polyethylene. 3. Heat-resistant wire line according to claim 1, characterized in that that the. inorganic, fibrous layer consists of asbestos. 4. Heat-resistant wire according to claim 3, characterized in that ge-P indicates that the heat-resistant impregnation agent is a chlorinated rubber. 5. A method for producing a heat-resistant wire line for high temperatures, characterized in that a material is molded onto an elongated, metallic conductor, which is made of a normally solid ethylene polymer and at least one enticing agent therefor consists; that the molded material is made durable, i.e. ^ is intertwined; that on the molded and solidified Material an inorganic, fibrous material attached will; and that the inorganic, fibrous material with a heat-resistant, chlorinated, polymeric impregnating agent is impregnated, increasing the service life of the heat-resistant wire cable for high temperatures caused by "Accelerated heat aging tests can be determined, is larger than that of wire lines, which 009837/1700 the solidified, molded material, but not the impregnated, possess fibrous material. 6. The method according to claim 5? characterized in that the Normally solid ethylene polymer is made from polyethylene. 7. The method according to claim 5, characterized in that the fibrous, inorganic material consists of asbestos. 8. The method according to claim 7, characterized in that the heat-resistant impregnation agent made from chlorinated rubber consists, wherein the chlorinated rubber was added to the fibrous asbestos in the form of a solution. ■ 9. The method according to claim 5, characterized in that before the molding of the material on the metallic conductor of this is previously provided with a peelable material, whereby the former material is easily peelable. 10. The method of claim 9 _{9 9} characterized in that the peelable material is made of paper. 009837/1700 Empty soap