DE1544636A1 - Magnetic plastic mass - Google Patents

Description

Ο Ί j ed Chemical C

Plastic compound

By combining magnetic particles with a plastic as a binder, materials can be produced that are both flexible and magnetic. Solehe flexible magnets are becoming increasingly important in special fields of application, such as for magnetic catches on doors, and in particular because of the possibility of using aie instead of the more expensive and rigid, metallic magnets, such as are used, for example, in electric motors. In order to increase the strength of such magnets and to expand their application possibilities, there is a growing demand for plastic biases that can absorb as much magnetic material as possible, so that correspondingly stronger magnets can be produced. The manufacture of such a magnet 1st Jidooh

00 # 27/1 07

not easy, because the presence of increasing amounts of magnetic material increasingly deteriorates other desirable properties of the "plastics". These properties include flexibility, which can become so low that a thin strip of the product breaks even after a single bite or gets jumps *. This is how it was stated that a "flexible magnet" containing about 90% of magnetic material breaks when bent long before an angle of 90 ° is reached. Amount of magnetic material are obtained compositions which once i.iicht by an angle of 45 bent v / to earth ground, without breaking [. Also the / deformation of such magnetic hates. is difficult then and there is a lot of waste. A special advantage of such magnets could be, apart from their deformability by compression molding or extruders, which are less expensive methods than those required for the manufacture of metallic magnets.

The object of the invention is therefore to create new magnetic mice that are both highly flexible and strong magnetos.

The subject of the invention is a flexible magnetization case Mass, which is a plastic as a binder and fine

Contains disperse magnetic particles. The crowd is characterized in that it is used as a binder

an ehxprupfcw .linwti Kthyi · »- 'bad original

contains polymer and about 30-1 ^ 0 parts of a normally liquid plasticizer per 100 parts of chlorinated polyethylene of © and at least about 90 wt ~% finely dispersed magnetic particles, wherein the chlorinated polyethylene 32-55 wt -.% contains chemically gebimäenes chloro ^. a crystallinity below 3%> determined by thermal differential analysis, a glass transition temperature of -18 + 1O ⁸ C for a chlorinated polyethylene with a chlorine content of 3Ί5 $> up to about +63 + 15 ⁰ C for a chlorinated polyethylene with a chlorine content of 55 $ and a molecular weight corresponding to an intrinsic viscosity of 3-6 in o-dichlorobenzene at 10O ⁰ G. . ^!

The compositions of the invention generally have excellent flexibility. Also, the flexibility of compositions containing magnetic particles over about 92 to 93 $ to au 95 ^ 5 or darüberj, based on the weight remains high and may even be better than the one contained masses small amounts of magnetic material. The compositions of the invention are not only strong magnets and have good flexibility, but also have other advantageous properties such as good impact strength, elongation and tensile strength. They can easily be processed in the usual equipment .

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^f ti BAD ORIGINAL

1544638

The new compounds contain a chlorinated polyethylene with a content of ρ3 ~ 55 wt. ~ $ Of hemisoh-bound chlorine and a high molecular weight;) corresponding to an intrinsic viscosity of 5-6 in o-dichlorobenzene of 100 ¹² C. The preferred chlorinated polyethylenes have a chlorine content of 35-50Ji and an intrinsic viscosity of 2 »5 ~ 5. The chlorinated polyethylenes present in the compositions of the invention contain the chlorine in such a distribution that they have little or no crystal in it, determined by differential thermal analysis. In other words, the crystallinity of these polymers is less than about $ 3 and preferably $ 0. The chlorinated polyethylenes also have certain glass transition temperatures that vary with the chlorine content of the polymers. The GXat transition temperatures of these chlorinated polyethylenes are in the range of ~ 18 + iCPil for a. chlorinated polyethylene with a chlorine content of Zö% up to 6p ± 15 ^ for a chlorinated .Polyäthylen with a chlorine content of 55 wt .- ^, The preferred chlorinated polyethylenes have glass transition & ngsteniperaturan in the range of -15 ± 1 (K with a chlorine content from 35 $ to au 55 ^ 15 ^C C with a chlorine content of 50 $. These chlorinated polyethylenes are those obtained by chlorinating a linear polyethylene, where as a "linear" or "practically linear"

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1544836 ■■ ■■ - 5 -

Polyethylene a high density polyethylene with at most ■ nominal, short-chain variation, i.e. essentially Methyl groups - usually less than about 10 methyl groups per 1000 carbon atoms in the molecule and usually Contains 0-5 methyl groups per 1000 carbon atoms.

The chlorinated polyethylenes itself unable such large quantities of magnetic particles as they are necessary to Ker ~ position de ν compositions according to the invention, take ■■. ' In order to obtain such strongly magnetic masses * the chlorinated polyethylene must be mixed with a plasticizer that is liquid under normal conditions. It has also been found that the use of certain liquid plasticizers which also have surface active agent properties can provide a considerable improvement in both magnetic strength and flexibility of the magnetic pills in the presence of a certain amount of magnetic particles.

The amount of plasticizer required is at least 20 and up to 120 parts per 100 parts © on the chlorinated polyethylene. The preferred compositions contain 40-70 l'oile plasticizers each; 100 parts of the chlorinated Polyethylene. Suitable normally liquid plasticizers are known. The reasons for this are the chlorinated clay

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aliphatic and aromatic hydrocarbons, the liquid epoxy resins such as those obtained by reacting Kpichlorhydrin with bisphenol-A, the epoxidizing drying oils _Λ wis epoxidizing soybean oil, as well as the monomeric esters and polyesters known as plasticizers, which can be used in the compositions of the invention chlorinated hydrocarbons containing chlorine on the one in amount of generally 20-70 wt -.%, and have a molecular weight between 200 and 40C0. The preferred chlorinated hydrocarbons are the normally liquid chlorinated aliphatic hydrocarbons with a chlorine content of $ 20-55 and a molecular weight of 200-2000. The monomeric esters which can be used as plasticizers are generally preferred. Examples of these are the esters of phosphoric acid, Phthalic acid, adipic acid, and sebacic acid with alcohols generally having 2-16 and usually 4-12 carbon atoms. Examples of such monomeric esters are tricresyl phosphate, diethyl phthalate, dibufcyl phthalate, 2-methylphenyl phthalate dioctyl phthalate, butyl cyclohexyl phthalate. phthalate, didecyl phthalate, diisodeey1-phthalate, diisobuty1-phfc'häl & t, octyldecy1-phthaiab dismyl phthalate, dioapryl phthalate, diethoxyethyl phthalate, dibutotyl ethyl phthalate, dibutotyl ethyl phthalate, diootyl acetyl phthalate, diootyl acetyl phthalate, diootyl acetyl phthalate, diootyl ethyl phthalate. "Of these plasticizers, the monomeric esters of phthalic acid are preferred.

ORIGINAL 0 0 9827/1807

Some liquid Weicl'iiaacher are known to be surface-active, and have been found that such materials are particularly good for. the production of magnetic masses that are both strong magnets and have / are good flexibility. Of these plasticizers, the fatty acid esters of alcohols having 2-12, preferably 3-8, carbon atoms are particularly suitable. A special example of such a fatty acid ester is butyl stearate. The surface-active plasticizers. will-mouse amines with. the?. Ubliohsren.WeichDiachem uses * and an improvement de ?; ¹ Properties of the compositions of the invention is already achieved with an amount of such a plasticizer of about 2 parts per 100 parts of chlorinated polyethylene. The "surface-active plasticizers can be used in amounts of 2-85% by weight of the total plasticizer., And-the-best. Results are obtained when they are used in an amount of 30-75% by weight of the total plasticizer The presence of the surface-active softeners has a particularly favorable effect when the new masses have a high content of more than 9 % to 93% of magnetic material, since with such a high content of Magnetic material, the compound sv / ischen ^: the chlorinated polyethylene present as a binding agent and the magnetic particles in the absence of such a soft adhesive no longer results in masses with high flexibility and high magnetic strength.

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BATH

The chlorinated polyethylenes used in the compositions of the invention do not absorb the plasticizer used well using conventional procedures at or around room temperature. This difficulty can be overcome in this way. * Ö.asset the plasticizer at a temperature above about 9;) ^C Q _S jeöooh not above et ν / ε. 221 ^{brings 1} C into the chlorinated polyethylene. At these temperatures, the chlorinated polyethylene easily absorbs the plasticizer and forms with it a mass of very good homogeneity which, even when heavily loaded with a magnetic filler, forms a mass of high flexibility. At high temperatures, chlorinated polyethylene is subject to degradation, so that the chlorinated polyethylene is expediently first mixed with a heat stabilizer before it is heated to the temperatures required for the introduction of the plasticizer. The heat stabilizers which can be used are those which are commonly used as heat stabilizers for chlorine-containing plastics. Examples are the inorganic salts and organic complexes of salts and metals, such as barium, cadmium, sense, zinc, lead and sodium * Also the liquid epoxy resins, such as those obtained by reacting epichlorohydrin with bisphenol -A-, are suitable. The heat stabilizers also protect the polymer during subsequent shaping by extruders or other methods that are carried out at elevated temperatures.

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SAD ORiGiNAL

The heat stability is usually used in amounts of 5-13, -in particular 2-10 parts per 100 parts of chlorinated polyethylene. The introduction of the plasticizer at elevated temperatures is expediently carried out in customary volcanic systems, for example a Banbury or on a roller mill. The heating of the chlorinated polyethylene during mixing can be done by adding heat to the mixing apparatus? and or, or by the frictional heat during mixing. The plasticizer can be mixed with the chlorinated polyethylene either at room temperature or at an elevated temperature, and this initial mixing can be done before or after the chlorinated polyethylene is heated to the temperature required to achieve a homogeneous mixture. Preferably Weichmaoher ".and rasoh chlorinated polyethylene, that is, within about 5 minutes and preferably erhitst within less than 2 minutes to the plasticizing temperature. This may be characterized e3? Follow _a characterized in that the mixing apparatus and the chlorinated polyethylene or or above about 66 ⁰ . C preheats preferably, the plasticizer, the chlorinated polyethylene ma of the heat stabilizer in a separate Vormischappara be ^ ur mixed together and this mixture is then represents mixing apparatus, preferably an: a Temperatir near or above the PlastifIzierungstanperatur, preferably 93-177 ⁰ C, preheated two-roll stool. Dar Welcnmacher is then placed above the plastic floor

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- ίο »■

temperature in a time of. gjswühnlich 1-iO minute tone after introduction into the mixer to form a homogeneous mass mixed with the chlorinated polyethylene. Then de :? plastified mass at a temperature above about 66%. . vorzugsi'ielse after the temperature of the mass to '66 -1 (WH eingast-ellt is zußemiBQht ;, the magnetic particles it has proven to be aweotoTiäßig, the magnetic particles gradually 3u;.? _f ußetsen when grasped with a high content of magnetic particles produced who · - the intended Preferably, first a large sr I oil, but not the total amount, eye fitted to the magnetic 5Glichen Mach thorough mixing of this first part, the residual magnetic material ind added to the "mixing are continued until a... If the procedure is followed in this way, a particularly good distribution of the magnetic particles in the binder is achieved, and flexibility and magnetic strength are also influenced by the way in which the magnetic particles are introduced The preferred method is to add the magnetic particles before the polymer is heated to the plasticizing temperature ^{WiI 1} U, which is generated when the solid magnetic particles are mixed in, is used. The heat-stabilized chlorinated polyethylene is with or without the plasticizer on a SiWe! Roller mill, which is preferably on a

0 0 9827/1807 bad original

Temperature exceeds about 66 ⁰ Q ₁ '82 usually -110Ϊ / preheated, if "" After the chlorinated polyethylene is about 1-2 minutes with the Weichmachervermischt that magnetischsn particle, preferably gradually added. By mixing in the magnetic. Heat generated by particles is supported by the further heating of the mass, so that the plasticizing temperature is reached in a short time, the plasticizing takes place and the mass containing the magnetic filler is formed. When using .this .Methode, the mixing device is expedient, foei-. spiGl-s-wise through the use of ordinary water, cooled in order to keep the ^{temperature below about 221 ° C.} The mass emerging from the roller frame is particularly suitable for shaping, for example by extrusion or according to other processes, into a wide variety of flexible products. -

Any of the known 'fine' materials can be used as magnetic material ^:! disperse permanent magnetic materials are used, which must be "magnetically ¹ *" might understand under "magnetizable" means that it is often necessary in the art to magnetize the particles according to their association with the binder. The magnetic fillers present in the compositions of the invention normally have a particle size in the range of about Ο.5-15µ · The particle is preferably less than 10µ and especially

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an average particle size of 1-; 5μ .. is preferred:

Preferred magnetic & schG FdI 1st off ο are the complex metal oxides known as ferrites i, ie inorganic materials of the formula MFe _n O _n * where M is a double metal and j m and η are integers. The preferred ferrites are
the barium ferrites, for example the barium ferrite
Formula BaFe ,, gOjg.

The chlorinated polyethylene used in the bulk of the invention

is used, is preferably made by chlorinating a j

linear high molecular weight polyethylene in one '

heterogeneous medium in individual stages, initially i

at a temperature below the crystalline melting point: the polymer and then at a temperature above the
crystalline melting point is chlorinated, manufactured, The manufacture

of the chlorinated polyethylene is expediently carried out as two j

staged chlorination of high mole linear polyethylene · -!

kulargewlcht in a suspension, the first stage j

! in an aqueous slurry at a temperature below

the crystalline melting point of polyethylene, preferably
at about 60-130 ⁰ C, and usually at 90 ~ 120 ^ ^c C performed
will be until at least about 5 # »preferably about 10 $. chlorine
are introduced into the polymer. In the second stage
will contribute to chlorination in the aqueous slurry
a temperature above the crystalline summer point of the
Polymer! «Atss, however, below the softening point of the

chlorinated external sources of it, carried out, measures the
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I. ■

i ■ ■

desires © amount of chlorine is introduced. ϊη the "second Stage v / grounds chlorination temperatures of at least about

I ■ j -

IJ ^ -and preferably 135-150 ⁰ G applied. If desired, the chlorination may be used in the second stage at a temperature above melting point of the crystalline äem PoIymG'risats carried out 'as long are introduced to at least about 5 weight "..- # chlorine in the polymer, and preferably to the polymer total, at least 25 $ "includes chlorine, and the chlorination may then at a lower temperature, for example 110-120 ⁰ C are continued until the eats introduced .gewünschte total amount of chlorine, .. '■■."

Suitable for use in the compositions of the invention chlorinated polyethylene, obtained by chlorinating linear Polyethylene with a molecular weight of at least

i. ■ -

about 700,000 to et v / a 5,000,000, preferably

1,000,000 are up 3 000 000 was obtained. Bsi the chlorination dos linear polyethylene having a molecular weight of 1-5 million by the above described two-stage process, the particularly preferred chlorinated Poiyäthylenemit 23-55 wt - weight% chlorine and a high molecular · »corresponding to an intrinsic viscosity of at least about 3.5 in o. -Dlohlorbenzene at 100Έ. These preferred chlorinated polyethylenes Bind also chemically inert and boi 20-25 ⁰ C insoluble in organic

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Solvents such as esters, acids and alcohols. You ^ have tensile strengths according to ASTM D δ ^ 8 ^ 8τ (at a pulling speed of 5 cm / min) of at least about 176 kg / cm and usually between 3.76 and 316 kg / cm 'They also have tear strengths in accordance with ASTM D'638- * 8T (true ultimate tensile strength) of at least about

77? kg / cm j and the preferred chlorinated polyethylenes with a chlorine content of 35-50. $ Have tensile strengths of 773-1406 kg / cm * The crystal initat eggs chlorinated polyethylenes is less ALSs about y $> and preferably 0% "determined by differential thermal analysis ^ and the glass transition temperatures are between -18 + for a chlorinated polyethylene with 33! $ Chlorine and +63 + for a chlorinated polyethylene with $ 55 chlorine. The. preferred chlorinated polyethylene had glass transition temperatures from below Ms at least -15 ψ 10 ^c C to a chlorine content of 35% to about 35 + -1-G ⁶ C with a chlorine content of 50 $. The glass transition temperature, a transition temperature of a wide order, can be determined by plotting the stiffness modulus of the sample as a function of temperature, and can be defined as the temperature at which the stiffness modulus has a value of 10 ^ dyr./cin " The determination is carried out in accordance with ASTM D 1053 · -61. In fact, the glass transition temperature is the temperature below which the chlorinated polymer is brittle, while they are above the glass transition temperature

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BATH ORIGINAL

become more flexible and rubbery. The low glass tubs rgangsteriipcD rat uranium of chlorinated polyethylene tragic to the ability cter masses of the invention,: '. hre good elastomers !! Maintain properties even at low temperatures. "

The chlorinated polyethylene can be made from a linear polyethylene of. high molecular weight, which can also be characterized in that it contains long-chain polyethylene branches, are prepared as described in British patent specification 858 6 "t% of the Allied Chemical Corporation, ie by polymerization of anhydrous, oxygen-free ethylene in the gas phase below the softening point of the Polyethylene over a porous catalyst made of an inorganic compound of chromium and oxygen and an active metal alkyl on a carrier made of silicon dioxide or silicon dioxide / aluminum oxide. The polyethylene thus produced contain residual amounts of the chromium / silicon dioxide catalyst in in an amount of at least about 0.001 and usually 0.001-0.002% by weight. This residual amount of catalyst remains in the polyethylene during the chlorination and contributes to the properties of the chlorinated polyethylene. The polyethylene has a density of 0.955 - before chlorination. 0.985 and a crystallinity of at least 75 $ and usually in the range of 75-85 ^, determined

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~ 16 "-

by differential thermal analysis. The preferred polyethylenes have average Gewichtsmolekulargewiclite between 1 and 5 million and preferably between 1 and '} & million; calculated by the method of PS Francis a solution of about 0.05 to O et al from the viscosity of ₁ I g of polymer in 100 cc solution in decalin at 135ΐ according to the equation

η -'6,77 x 10 ^"4 M ^{0 '67} wherein η - intrinsic viscosity

M a »mean molecular weight (J. Polymer Science. Vol. 31, pp. 453-466 - Sept. 1958).

The following examples are intended to illustrate the invention. Parts and percentages are based on weight.

Examples 1-6

Chlorinated polyethylene with a chlorine content of 1% was produced by the gradual chlorination of linear polyethylene with an average weight of 1 million and a density of 0.9% in an aqueous slurry. The polyethylene used for this purpose had been prepared by the method of British patent specification 858 674 (Example 6) by polymerizing anhydrous, oxygen-free ethylene in the gas phase over a catalyst made of magnesium dichromate on a porous support with aluminum triisobutyl.

° 0 9 * 27 / 18t> 7th

■■ .... ■■ - 17 - ■■■■■. ■

The carrier consisted of $ 90 silica and 10 # alumina. The chlorination was carried out in the first stage at a temperature of about 100 ⁵ C, were introduced to 175g chlorine in the polyethylene, and were then introduced into a sweiten stage at a temperature of l4 (K, until a total of about 35 $ chlorine in the polyethylene The chlorination was then continued at a temperature of about 110-12O ⁴ C until the total amount of chlorine was 45 wt. it had a Giasübergahgstemperatur of about 5 ⁰ C (ASTM Dl053-63) and a crystallinity of Q%., as determined by differential thermal analysis, and a high molecular weight corresponding to an intrinsic viscosity of 4.0 in ο-dichlorobenzene at. 100 "C.

100 parts of the chlorinated polyethylene prepared as above were made with 3 parts "Temex" 50 »a barium and cadmium contains the National Lead Company organic heat stabilizer. They were also chlorinated Polymer about 58 parts of dioctyl phthalate as plasticizer and about 0.5 part of stearic acid added as a lubricant. Each of the masses was called barium ferrite as a magnetic filler in an amount ranging between about 1Λ0Ο and S400 Parts by weight varied ©, added * The barium ferrite had an average particle size of about 1-2μ. In the

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In the preparation of the masses, $ 90-95 of the total barium ferrite was first added, and the mixture thus formed was placed on a two-roll mill (15.2 30.5 cm) with malts rotating at different speeds, which were heated to a temperature from the inside by steam heating both rolls about . I49 ^r € were preheated. After mixing for 2 minutes on the roller mill, the temperature of ^{the mixture had risen to about 149 1} C and the mixture melted. Mixing was then continued for an additional 5-10 minutes, during which time it formed a homogeneous mass. Then the temperature of the mass

^{lowered to about 82 °} C within about 10 minutes and the remaining 5-10 $ barium ferrite was added. Mixing on the roller frame was continued for another 5-5 minutes, a homogeneous mass being formed, which was applied as a skin with a thickness of 3.6 minutes from the roller frame. Samples were then taken from each of the masses. The test values of these samples are compiled in Table I.

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T a b e 11 e

Example Nf.

Barium ferrite., Parts by weight

Barium ferrite,

Spec. Weight

(W

Breaking angle ^K '

Mandrel bend 2.5 cm mandrel Magnet strength, gap 0.38 mm hat) 2.54 cm each length

(lbs. lift per inoh length)

1449 1628

90 3..80> 90

180 0.221

91

3.90> 90

180 0/238

1740 91.5

86 l8o

1890
92.

66
18o

2000

51 ■

0.2t6

■ A 5.1 cm specimen was determined to work on a Tinius Olsen Tester for stiffness with load scale 50 below ■ Use of a calibration weight of 0.45 kg. Dar The maximum angle applicable in the tester is 90 "»

2316

93/5 3.88

59

From Table X it can be seen that the compositions of the invention strong magnetic and high flexibility.

The compositions of Examples 1-4 illustrates that up to 92 wt -.% Bariuinferrlt included, can all been bent to fully © 180 ° around a 2.54 cm mandrel. The masses of examples and 6 », which contain considerably larger amounts of barium ferrite, do not break in the Olsen stiffness tester even after being bent under a load of at least 50 °. The composition of Example 1 also had a tensile strength of 49.2 kg / cm and an unusually good one

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BATH

~ 20

Elongation of $ 85.

Using the starting materials and procedure of Example. 1, with the exception that the plasticizer was a combination of 23 parts of dioctyl phthalate and 30 parts (files was butyl stearate, a further 4 compositions were prepared. These compositions were tested as in Examples 1-6. The results are shown in Table II; .

T- a b e 11 e II:

Example no. 7th 8th 9 1921 10 Barium ferrite
Parts by weight 1503 1689 92 2219 Barium ferrite
Weight % 90 - 91 4.00 93 Spes.Gev / ioht 3.83 3.93 50 ^, 00 Bruchviinkel ^v "· ' . > 90 > 90 > 90

Mandrel bending

2.54 cm mandrel I80 I80 133 ISO Magnet st ärkoj gap 0.38mm

Stroke per 2.54 era

Length 0.221 0, S29 0.247 0.265

All of the compositions listed in Table II are excellent Flexibility and high magnetic strength, which is roughly proportional because the amount of magnetic particles increases.

0098277 1807 ^BA ®

Table II also shows that the compositions of the invention have improved flexibility at high magnetic strength as the amount of magnetic particles increased above about $ 92. Thus, the composition has from Example 9- containing the particle 92 $ magnetic, ent a break angle of 50 ° and a Mandrelbiegung of about .135 °> while the mass of Example 10, the hen about 300 parts or more parts to the HSLT , has a significantly better flexibility with a breaking angle of more than 90 ° and a flexibility around the 2.54 mandrel of 18 °, Table It also shows the improvement in the magnetic strength through the butyl stearate, in particular with a high content of magnetic particles. Thus, the composition of Example 10, which contains $ 95 magnetic material, has not only a higher magnetic strength but also better flexibility than the composition of Example 6, which contains $ 92.5 magnetic particles.

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Claims (1)

P at ent a η s ρ. r ti c he 1. Homogeneous flexible magnetic mass which contains a plastic as a binder and finely disperse magnetic particles, characterized in that it is a chlorinated linear Kthylehpolyraerisat and about 30-130 parts of a normally liquid Weiclimacher per 100 parts of the chlorinated polyethylene and at least about 90 contains Gaw ~ $ finely dispersed magnetic particles, v.:. obei the chlorinated polyethylene 33-55 wt - $ cheßiisch containing bound chlorine * a crystallinity untor 3 $ * determined by differential thermal analysis, a Glastibergangstemperatir of -18 * 10 ⁰ C at a Chlorine content of 33% to, see below about +63 + 15 ¹ C with a chlorine content of $ 55 and a molecular weight corresponding to an intrinsic viscosity of 3-6 in ο-dichlorobenzene at 100 ⁸ C. 2, wet according to claim i, characterized., that 2-85 Qew * - # of the whitening agent from a surface-active Plasticizers exist. 3, mass according to claim 1 or 2, characterized in that that they still have a heat stabilizer for the chlorinated ■ ■■■■■■■ ": ■ -, ■". ■ ' BAD ORIGINAL 009827/1807 Contains polyethylene. Λ. Process for the production of a mass according to one of Claims 1-3, characterized in that the chlorinated polyethylene is plasticized with the animal maker at a temperature above about 93 ⁰ C, but below about 221 ⁸ C - and the magnetic particles with the plasticizer and the chlorinated polyethylene are mixed at a temperature above about 66% su a homogeneous mass. 5. The method according to claim 4, characterized in that that first the chlorinated polyethylene by introducing a heat stabilizer against decomposition by WUxroe is stabilized. . 6. The method according to claim 4 or 5, characterized in that that after the homogenization of the mixture from Plasticizers and. chlorinated em polyethylene initially the main amount of finely dispersed magnetic particles and the Rest of. Magnetic particles after thorough mixing the main amount in the mixture of plasticizer and chlorinated polyethylene is added. 7. The method according to claim 4 or 5, characterized in that that the main amount of finely dispersed magnetic particles before the homogenization of plasticizer and chlorinated 0098 27/180 7 ... 24 - Polyethylene was added and thus when it was mixed in with it Part of the frictional heat generated to increase the temperature the mass is used and the rest of the magnetic particles after thorough mixing of the majority of these Particles with the plasticizer and the chlorinated polyethylene is added. 009827/1807