DE1521179A1 - Magnetic material for recording information and a method for its manufacture - Google Patents

Description

Clevite Corporation, Cleveland, Ohio, U.S.A.

Magnetic material for recording Inf raations unJ. a method for its manufacture

The invention relates generally to a magnetic one I. material for recording information, and specifically relates to magnetic tape oO \ .ie on a process for its manufacture.

Perhaps the people most well-known and widespread ii & RPIC diagram recording material consists of ^ adelfcrini ^ em 2isenoxyd that as a thin layer onto a suitable, flexible Grundmattrial, or a Schichttr. ^ He iunststoff generally paper or ^, is applied. Although the storage capacity of magnetic material should be as large as possible and magnetic substances are known which in this respect are superior to biaenoxide, the use of these substances is made difficult by the fact that they are very difficult to achieve as a thin layer completely; easily and firmly adhering to a layer support are to be raised. Some successes have been achieved in all directions with nickel and nickel-cobalt alloys, which were applied to flexible, non-conductive layer triggers using a non-galvanic process. With regard to the characteristics for information storage in electronic calculators, planes and data processing systems, these magnetic materials generally allow a lot

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üurij · Your weakness is by no means that relatively low coercive force.

The good own. The countries were successfully used as substrates for some Nazi layers, particularly iron oxide. !. The properties - _e r w Polyesterfilne; droughty j ^ AOCH for most of the other "Asian films in relation to the Kaitfuliigkoit and Gleicnförmigkeit ier ocnicLt a befrieii ;; forming IlarnstDaterial insufficient. Particularly the Trk ... hei f the polyester and aie hochgläniende iiyarophobe Whether rf kfiiij laugh that such for Gielifilme substances. ^ Oicnnerid is an extremely difficult problem to be solved with respect to the dyeing, leather and similar manufacturing processes have bervorgerufen of Hagnetmaterials. The Polije was this is that seiir were developed many Oberfiächearorbenandlungen, then to aas Stick is on _t; etr. -to achieve or improve the "jc.iiorites". These pretreatments are carried out in various ways and produce various instantaneous effects. The main goal in general is at least the lintelinz of the oil, so let the wetting ability through LiikrosKÖpisch fine roughening orl.öht ./ird. lach a _b * rund3Üt :: j.ichen Before b-.lxani-ung we.i the. '. surface treated with an accent for de-lancing. A ^ eiapiei this Behandlun a-V Gi-fahrti 's is in eng c.ti ^ rikaniscLen Pa ent ^2: describes -6ö ^ 3 ^. The selected atoms or alkali metal irox; de. Whether where; J. r..an With such a pro

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Treatment generally Polyesterfilrie and inst'-üonaere neiiralkalische Terephthalatfilue entglän- zen can so that they iiät geei ^ for the various subsequent Peliaiidljngen oind, these are known Ocliaiiviluiigsariiea ~ for preparing the ^L? ilmo "t area for uagiietiscne scenes according to the egg fin-.a.aj vo 11 k oKjnen unsuitable ·

A head ^! j :: iel ctr ignition i3t an improved. •• lafc ^ Kti- ^ Ci.es Auf-seicixnun ^ eoaterial and exn procedure door its "t, rs te 11 us, the disadvantages --es conventional '! · = · : rs υ eil uiv's procedure eliminated: t oier reduced.

Another goal is a metal-covered magnetic tape i-i'v. a layer of plastic that is cloudy a high permeability and high hecicinence together r.it f.united in a large coercive locust.

Another goal is a magnetic tape with a higher linear ooeiclierka / azitrvfc than that of conventional Materials.

Furthermore, a new manufacturing method for a magnetic recording equipment is to be provided. According to the invention, this is done on a layer support A thin, evenly thick, firmly adhering magnetic layer made of linear saturated polyester applied, which is substantially free of non-uniform it s. The magnetic layer mainly consists made of metallic cobalt

Another object of the invention is a method

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which prepares the surface of the linearly saturated polyester film in such a way that a Nonyjalvanic processes can apply a thin, firmly adhering magnetic layer which is substantially free from irregularities.

In general, the magnetic recording material according to the invention contains a flexible support made of linearly saturated polyester filament, a thin, continuous magnetic layer which adheres to a surface of the support and which consists mainly of metallic cobalt and preferably contains a little phosphorus, and on the outside The interface between the rail support and the magnetic layer is very large, and catalytically active cores, preferably made of palladium, are equally distributed.

According to a further object of the invention, a manufacturing method for magnetic recording material, in which a substrate is linearly saturated Polyester is coated with a magnetic layer, the following steps of decomposition: essentially uniform hydrolysis of the substrate on the entire, surface to be coated or metallized | chemical deposition of catalytically active metal grains, preferably paladlum, on the hydrolyzed surface; and coating of the coreed surface with a non-electroplating metallizing solution, which contains cobalt plexions, preferably. in the presence of hypophosphites as a reducing agent on the Surface of the layer carrier a continuous magnet to form a layer that consists mainly of cobalt. While never letting go of the layer and another one

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1521173

some time thereafter, the magnetic layer and the adjoining surface of the substrate kept steady, so that there is no relative shift of the layer over each other the surface take place and the magnetic layer with the village can stick firmly.

Further objects and details of the invention become explained on the basis of figures in the following description

Pig. 1 creates one thematically. Cross section through a Part of a magnetic recording material of the invention in an enlarged Madstab *

fig " 2 " shows a small section of the magnetic material shown in Fig. 1 in a greatly enlarged "house tab,

5 seist a bevoraugten manufacturing process of a ge in figures 1 and "A St geMigt ·· Kagnetmaterial" AESS the Irfindur ^.

/ '■' ■ '

FIG. 4 is now modified from FIG. 3

Preparation process 10 for a magneteaterial gealA the invention·

Figures 1 and 2 'intrinsically acheaatically a cross-section dixch a metalized lunststofX-Magnetbwid wet The invention “The magnetic tape works one layer longer made of polyester and a magnetic layer made of one Cobalt coating that is glued to a surface of the sliding • trügers test

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J Vie _i:? Ur 2 shows exemplary a plurality of catalytically active particles, in particular linen, metallic Pailadium particles (greatly enlarged Dare distribution, so 0 * 11 lau αϊ β grains just sees) to UEN plastic UUb and awar at the interface between der Ha £ nic; ohloht and de a layer bearer. To get the best effect exvielen au _t AARF a certain minimum grain density 4 "r Obtrfläohe dea plastic tape ·· not lower abritten wvrdsat and the distance between the grains must not fall below a certain limit, \ m the Rlederaohlagen the K ^ netdchicht * u erleiohtern. The majnet layer has essentially nothing and adheres firmly to the plastic material.

The application of the PaIf ¹ i.diuakörnvSff to the surface of the plastic stiffener is still described in detail. The best Srgebniiie were erslelt if you nit 13 grains a Durchaesser of JO Angatrö "or more aufbracht definitely Quadrataikrometer the surface _(of the plastic tape · and if the average distance" wipe no longer was the einselftsn grains as 2.öCO · Å ·

As already mentioned, the dl is supporting the magnetic layer Orund material a linearly saturated pelyester film,

see e.g. poly (alkylene) terephthalate and other foly " (ethylene) terephthalate.

The lineaj used for the invention? saturated - Polyesters are known to have linearity UWr dl · production

these polymeric bonds are found in America

*
t

Patent documents 2 465 319 »3 & 5C 465 and 2 β> 7 563.

The pre-emptive & e Haterial ala layer carrier let polyethylene terephthalate, the tian after, a conventional one Process by an ester Aue taue clireakt ion between Methylwrephthalate and ethylene glycol in the presence of a « Catalyst, e.g. B. metallic sodium can·

Suitable polyester films are available under various trade names η, such as B, "Mylar" (Dupont), "T-16" (Bastiian Kodak) and ^ Iielinex "(Imperial Chemical Ind. Ltd.) while these films are large in terms of dimensions! The tape used as magnetic tape preferably has a thickness of about 12.7 ois 2> 4 KikrOmeter (0.3 to 10 mile), a width of about C, j> 17 to 122 ca (1/6 - 4b inches) and one * under achiedliche length, dl · of the respective Yerwendungazweck or the need for the tape to be stored on a hell or similar device dependent. ₍

The magnetic layer, which is preferably made of a cobalt alloy, never contains more than 97 % cobalt. D _e r other alloy component is phosphorus * Ea may be small quantities of nickel and / or iron present, but reduce the coercive force of the aagnetisohtn layer. The magnetic layer made from a cobalt-phosphorus alloy according to the invention has advantageous magnetic properties, possibly, as already mentioned, high permeability, high core and high coercive force. In addition, the magnetic layer essentially has a rectangular hysteresis loop. this

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1821179

• ο · »

is of equal or even greater importance with regard to the storage capacity and the resolving power.

Da3 manufacturing method of the in uen Figures 1 and 2 Masnet clay pastry material comprises three main manufacturing

previous:

(1) A special «surface pretreatment dee Layer carriers |

(2) the application of catalytically active grains to the pretreated! Surface of the substrate; and

O) depositing a magnetic layer on the Surface of the layer support by autocatalytic reduction of a non-alvanic betal-isolating solution, the cobalt coaplexions and preferably contains hypophore ions) as Serving reducing agents and providing phosphorus for the magnetic layer.

The details of a preferred manufacturing process exactly the invention are described with reference to FIG.

The description of this particular production process serve only to explain and not to limit the invention.

hydrolysis

In the case of the “for” version, a 25.4 micrometer is used

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134 I I J «

(1 all) thick and 2.54 cm (1 inch) wide "Mylar" tape used as the backing. A 30.48 m (100 feet) long tape is subjected to a special pretreatment to hydrolyze the surface of the tape in a substantially uniform manner. This is achieved, however, the B is immersed in _a nd a hot liquid etchant composed of 209 Grasa P ^ro liter of sodium hydroxide and 150 ERA ⁵ per liter Prophlenglykol. This particular solution is achieved at a temperature of 60 to 15 ° C and an immersion time of 3 IUn. an .. inadequate hydrolysis. E =; must be self-evident ^: e3ajt .. ground, aaü üie the composition of the solution, its concentration and temperature as well as the special properties of the film used as the rail support sirid variable and interrelated parameters, all of which influence the required immersion time

For the hydrolislerend * solution, instead of the Sodium hydroxide, alkalis or any alkaline earth metal hydroxide, and any monohydric or polyhydric alcohol used instead of propylene glycol which is soluble in the solution and stable up to the operating temperatures.Suitable alcohols are see B. Ethylene glycol, diethylene glycol and ethyl alcohol. In this It must also be mentioned that in addition to the limitations caused by solubility and stability in the case of more volatile alcohols, there is another Problem due to their tendency to evaporate at operating temperature is added.

oen3jb, iliaierung

After hydrolysis, the tape is rinsed in water

to wash off the etching agent. Then the tape

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sensitized by immersion in an acidic solution of tin dichloride (SnCl ₂ ). In the execution example, the solution consists of 70 grams per liter of tin dichloride, 50 cnr per Idttr of Balzeic acid (HCl) and 0.5 gray per liter of sodium lauryl sulfate. The immersion time is 2 minutes at the sow temperature. This time is also subject to Indian days.

The presence of overti ^ en tin ions (fln ⁺⁺ ) is indispensable for the effectiveness of the solution, since these ions sensitize the surface of the strip for the subsequent absorption of the catalytically active grains. Although the tetravalent sense ions (Sn ^{+++ <f} ) do not contribute to the surface of the strip, their presence increases the absorption capacity of the tin and thus also the absorption of the catalytically active grains, which are deposited on the surface of the strip in the following step. The small amount of 1 gram per liter of tin tetrachloride is sufficient to increase the tin's absorption capacity. Instead of tin dichloride and tin tetrachloride, tin halide salts can also be used.

activation

After Senslbllisierung v / ith ana band rinsed in water and immersed in a clan activating * Bad "consisting of an aqueous solution containing 10 grams per liter of silver ^nitrate: is. The tape is immersed for about 1 minute into the activating Bk (I, the immersion time can be changed within a range of 13 seconds to 1 minute. During this time, the reduction effect of the divalent tin ions in the surface occurs absorbed by the tape

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are made up of the precipitation of separate particles Silver and silver oxide that are firmly attached to the surface of the tape cling.

Bekeraen . .

The tape is rinsed in water one more time and then seeded with catalytically active grains, while it is immersed in an acidic solution of palladium chloride. The silver particles that were applied to the surface of the tape during the activation process » replaced by palladium particles, resulting in metallic palladium grains, as already mentioned and described «

The solution to core the tape surface is at the mentioned embodiment of 0.1 grass »per liter Falladiufflohlorid and 1.0 or per liter of 35 # hydrochloric acid. The £ intauchseit of the tape in the bails, dluätblorio> Ii &> sun? is f hinute. You can however ven 15 flekUBde · .. ■ · can be changed up to 5 minutes. . .. - ■

Although palladium chloride as a catalyst is preferred here any Pailadiua halide ideal can be used.

After the confession, Aa's ribbon is washed in water, among other things remove the superfluous solution below. With «rinsing the The grains will not be waxed away, 4a they open the band surface »feat stick. . . ..

In this example, does s * n ti «e receive complete coverage and an auareichenuenj follow? the precipitation of the cobalt-phosphorus alloy, which as Magnetic layer is used when on a square micron

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On the surface of the band at least 13 palladium grains with a diameter of more than 50 Angstroms are distributed and if the abotand between the neighboring palladium grains after seeding does not exceed 2700 Angstroms. The number and spacing of the grains were verified after the surface had been cored using an electronic photomicrograph (26,500 x V _s r ;; enlargement).

During this pretreatment, which dee ' Covenant precedes, it is important that the surface dei Pandes to which the magnetic layer is applied should not be physically touched. The tape was therefore created while it was moving through the various solutions moving, by one- ^ arranged control rollers yetra-

en. By turning the tape 1ÖC ° between the The direction of movement of the land was changed.

As already mentioned, there are various types of thawing in no way critical. However, they should be so long be a complete wetting of the belt surface eewi.i -. rle is et is; jid enough time for each Reactions is present. If the pretreatment as continuous Operation is carried out by moving an endless tanda from the guide rollers through the various Solutions are found, then of course the Diving time can be controlled by adjusting the

eschwindigkeit de "s 3andes together with the throughput ai i _t _e- of the strip which is immersed at a given time in a given solution, regulates.

Metallization

After the pretreatment of the strip is finished, aiCobalt-phosphorus alloy used as a synthetic soft layer on one surface of the band after a non-Alvanic

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Metallization process put down.

The coating of the strip surface with the cobalt-phosphorus alloy is generally carried out by moving the pretreated strip through a non-electroplating metallizing solution which contains cobalt complex ions and hypophosphites as reducing agents, In the embodiment described, the solution has the following composition:

Cobalt sulphate * 7H ₂ Q 28-32 g / l Junonium chloride 50-100 g / 1 Sodium Potassium Faxtrate 50-75 g / l

, Hatriun hypophosphite 20-25 g / l

The fH-Vert of this solution becomes old Aanonluahydroxyd set between 8.7 and 8.9 · The solution sdt the front mentioned concentration ranges provides an alloy, the 1-1.5 percent by weight of Rioephor and others Alloy component contains cobalt.

A preferred solution has the following · Zuaaaaensjfcsung ι Cobalt sulphate * 7H ₂ O / JO g / l Ammonium chloride 50 g / l Sodium-Potassium Tartrate ■ 50 g / l Sodium hypophosphite 'H ₂ O ₍ 20 g / l Aminonium hydroxide around pH 10

to deliver.

At a temperature of 66-70 ⁰ C, the ·· supplies before * ferred solution else uniform unuatuurbroehen · Sohloht having a thickness of about 0.508 micrometers (20 micro-inohes)

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during a metal ir .; ierun,; s since about 12 minutes.

Wc.! Ure: id die chcii.i jchen (jesicncsp-nkte Deim metallizing a large Ein.lu.j aui "-.iie formation of a sufficient Hagnetscnicxit norms, sinu. Aie physical conditions, Lei which cl & s !! r-talxiüieren carried out is, of equal or perhaps greater importance. Ls is. »icutio that uas tape when immersed in the metallizing solution no physical stresses, such as stretching, stretching, twisting or other mechanical stresses, except for a slight deflection with a large The reason for this can easily be seen when one knows how the layer is formed on the substrate and how it is glued to it.

When the band is in contact with the metallizing solution, the palladium grains catalyze the The palladium cores serve for the formation of an isotropic alloy layer, which adapts exactly to the micro-copy surface shape of the tape.In this stage the adhesion between the magnetic layer and the surface of the substrate is very good and B _a naoberflache directly adjoin one another, leads back l.ian adhesion to the Vander Vaals'ochen forces. Either a deformation of the substrate or other effects which try to cause a relative displacement between the applied surface and the substrate prevent a firm connection the substrate and the applied layer,

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before the layer is broken down by a further treatment preconditioner, it is firmly bonded to the layer. Relative displacements of the applied layer e -enüber the tape should veri.iieden \ ivr'-en _t until a oleibende connection between the layer and UEN layer trüger concluded ^ · efcoma. * ¹ For the continuous metallization of a strip with different lengths, as previously mentioned above, the physical conditions which are necessary for a satisfactory, non-galvanic metallization, are the use of a U-tube made of Pyrex glass with a diameter of 10 ^ 16 cm (4 inches) «ls vessel.?. r satisfies the iaetailiusising solution. Pyrex tubes are commercially available as industrial products. Uiu in the execution fora mentioned here a I] intauciil..n _t ; e ^ tS band of 9 "It ^ c ^m (5 feet), ..earth the ends of the U-tube through straight glass tubes. In order to avoid any deformation of the tape immersed in the solution, except for a deflection with a large radius of curvature, a 5> »O6 ca (2 inch) wide / ös B-iia made of" Teflon "(poly trafluoroethylene), which is matched to the inner radius of the U-tube, inserted into the bend of the U-tube. The tape then moves through the non-galvanic metallizing solution by the non-metallizing surface continuously sliding along the U-shaped Teflon tape and over synchronously driven unwinding and take-up rolls to avoid stretching the belt.

Use to set the correct solution temperature a normal heating jacket the U-tube and conventional filters serve for the ongoing filtering of the metallizing

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Solution, ctle nacxi a non-Jalvanic method that Metallized band.

The final bonding of the cobalt-phosphor layer to the substrate can be carried out by natural aging, which can fluctuate between a few minutes and a day at room temperature, or preferably by heat treatment of the strip to prevent it from aging _t .ang to accelerate. During the heat treatment, the strip is kept at a temperature of around 70 ° C for 1-60 minutes immediately after metallization and pocketing. Then the tape is soaked in water and dried and is ready for use.

The sensitization and activation can be omitted in the manufacturing process described if one the confession, i.e. the production process in which the Band is provided with palladium grains, modified · Den Manufacture of this modified version fora of the invention shows? ig. 4. It can be seen that the hydrolysis and d: s metallizing is carried out in exactly the same way as in the Kerst! longitudinal method by? igur 3 * In the case of the modified Execution This is the form of the invention for seeding carried out that the hydrolyzed tape, after us ^ c-flush, in a catalytically active metal sol immersed. The tape is then washed in water, metallized and finished in the same way as it is described in the procedure of? igu # 3.

Next «Information on the use of catalytically active metal oils which serve to reduce the soul emf ·? before non-galvanic metallizing, do bakfrnM ». can

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taken from American Patent 3,011,920 will.

A specific example of nucleating a "Mylar" sand.es with palladium grains deposited from a sol is described below.

: Reduction of a palladium chloride solution (the pH is adjusted to 5) with formalin at a A palladium sol is produced at a temperature of 50 ° C. The hydrolyzed tape is immersed in the freshly made sol for 1 to 2 minutes, roped with water and then coated in the solution described by a non-electroplating process.

In this modified manufacturing method, the number of catalytically active grains per unit area and the distance between the grains become the same as in the manufacturing process of 7igur 3 * The cobalt-phosphorus layer applied according to the invention is generally thin. The layer thickness is in a range between 0.127 to 2.5 * micrometers (5-100 micro-inches) and depends on different parameters, such as B. the composition of the solution »temperature, Immersion time, etc. The layer applied is extremely uniform, fine-grained and essentially free of original uniformities that are greater than 25.4 Micrometers (1.0 mil) along the length of the tape and 6.35 micrometers (0.25 part) in the transverse direction.

The following table shows the characteristic values of some belts, according to the invention according to the in VIg. 3 described Process were made:

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Magnetic layer thickness (micro-inches) Coercive force Remanence in micrometers (18) in Oersted in Gaues 0.457 (22) 410 6 900 0.559 (24) 310 4080 0.610 (18) 350 5960 0.457 (22) 290 5 820 0.559 (19) 360 6,000 0.4ö3 (19) 420 5,300 0.483 (18.5) 400 6 030 0.470 (18) 420 5 860 0.457 (19) 45O 5 600 0.483 (19) 360 4 TOO 0.483 (19) .400 6 5 * 0 0.483 (9) 460 5,930 0.229 420 11 500

From the table above, nan can see that each a coercive force of at least »about 300 oersted (290 oersted is the lowest) and a remanence of Has more than 4,000 gauss. As a result of the higher coercive force and remanence, the magnetic tapes produced according to the invention are suitable for higher magnetic signals (with larger Signal to Noise Ratio) during playback and for higher information densities of the recorded binary digits than also suitable for a slower tape speed when playing. The width of the Aufnaheeimpulse can be the new magnetic tape will be 1/4 to 1/3 less than that Pulse width in conventional magnetic sound materials. As a result of the narrower pulse width, the new magnetic tapes et./a 3 * 8.1 can record as much information per tape length as the conventional magnetic tapes. she

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IVb I 1 W W

The storage capacity of conventional magnetic tapes is about 250 to 50C binary digits or "bits" per 2.54 cn (1 inch) while those made in accordance with the invention Magnetic tapes 1,000 to 1,5OC or more bits per 2.54 cm (1 inch).

The magnetic tape produced according to the invention, which has far better characteristics than the traditional magnetic tapes, is in particular a value-processing one and data processing systems, e.g. suitable for use here.

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Claims (1)

Expectations 1. Magnetic recording medium for recording of information, characterized in that-a thin, continuous magnetic recording layer, which mainly contains cobalt, on a layer support in a linear fashion saturated polyester firmly adheres ;!. Record carrier according to Claim "I _9, characterized in that the magnetachide contains up to three percentages by weight of phosphorus. 3. Recording medium according to claim 1 or 2, characterized in that the Magnetic layer contains at least 97 percent by weight cobalt. M, recording medium according to claims 1 to 2 »da -durcii characterized» that there are very many, approximately uniformly distributed, metallic palladium particles at the interface between the layer support and the magnetic layer. 5. Record carrier according to claim 4, characterized in that at least 13 Palladi.imteilchen with a diameter of muhr as pC Anjst-röiu are distributed on a square microaeter of the interface, and that the maximum distance between the adjacent particles is less than 2,800 Angstroms. 909831/1122 ßAD ORIGINAL 6. Recording medium according to one or more of claims 1 to 5 »characterized in that the layer support contains polyethylene terephthalate 7 · Record carrier according to one or more of claims 1-6, characterized in that the final thickness of the Magnetic layer is no larger than 2.5 * micrometers. 8. Process for the production of the magnetic calibration · ■ nung supporta according to claim 1, d a d u r · h -characterized that on a layer support made of linearly saturated polyester a thin » continuous magnetic layer, the main composed of cobalt, is applied, and that under the action of a, 3 catalyst · that calibrates is located on the surface of the substrate, the magnetic layer is firmly bonded to the substrate. 9. The method according to claim 8, i & 4b * el yeft eh characterized in that a · surface de « Layer support made of linearly saturated polyester is subjected to a pretreatment that during the pretreatment the surface of the support is unified Catalyst is seeded, then practice after a non-electroplated process to deposit a metal layer on the surface of the substrate, and that following the pretreatment d £ · surface with a non-galvanic metallizing · »Ijöauig, which contains cobalt, is treated, inter alia, to form a magnetic layer on the surface. 909131/1121 BATH ORIGINAL 1S21179 10. The method according to claim 9 »characterized in that a surface of the Schiciitträ ^ ers aua during the pretreatment Polyethylene terephthalate is hydrolyzed and then catalytically active material particles are deposited on the hydrolyzed surface. 11. The method according to claim 10, characterized in that the layer support by immersion in a hot, watery solution Hydroxyds from the group of alkalis or alkaline earth metal hydroxy de hydrolyzed, and that the solution contains an alcohol from the group of monohydric or polyhydric alcohols, which are in aer solution are soluble and persistent. 12. The method according to claims 8-11, characterized marked that pailadiuaa metal is used as a catalyst 13. The method according to claim 12, characterized in that on average at least 13 particles of palladium with a diameter water greater than 30 angstroms per square micrometer the surface of the substrate and that the maximum distance between the adjacent Particle is smaller than $ 2 00 angstroms. 14. The method according to claims 12 or 13 »- didureb marked that., the Palladia * by Immersing the substrate in a. Palladiunsel open the surface of the substrate is deposited. »09131/1122 -23- 13 * 11 / » 15 · / fc-rfahren η. Ch claims 12 or 12, characterized in that the palladium is precipitated by successively "dipping the layer carrier in an acidic aqueous solution of a tin halo _: jeriias, in a waosri ₍ ; e solution of a silo salt and in an acidic aqueous solution of a palladiurahalide." 16. The method according to claims 8-15, characterized in that cobalt is deposited on the surface of the oc: iichttra _b * er by applying a nic.itjalvanisch uietallizing solution, aie KobaltjCoiiplexionen and riypophosphiue as htuuktionsniitcel tnisi'ulty cobalt nieier _o , and that uie Ru; üulloc; iicht and outer layer support would be left to form the metal layer and for a certain time. V years according to Claim 16, characterized in that that the adhesion of the layer on the surface of the non-carrier is accelerated by a heat treatment, while the magnetic layer and the surface against each other calmly '..- earth. 18. V-rfaiiren according to claims Ö - 17, thereby characterized in that at least aie a surface of a polyethylene terephthalate film ..-. with a hot caustic agent containing AliQ'len ^ lycol, bthan.'eli; until the bar surface is hi-drolisi & rt, 909B31 / 1122 BATH ORIGINAL dai metallic on the hydrolyzed surface Palladium is chemically deposited as a catalyst, and that lasts the surface with a not ^ aIvani ^ cnen metallizing solution that Con, lex cobalt ions and a hypophosphite as reducing agent contains, is treated and a continuous magnetic layer of a metallic Cobalt-phosphorus alloy, which is precisely the microscopic Adapts the surface shape of the layer door, is formed immediately on the surface while. the layer and the surface are calm against each other held v.crden, and that the film and the magnetic layer -Lj 1 to 60 minutes to a temperature of about 70 ° C while the magnetic layer and the surface are not moved against each other. 19 · Method according to claim 18, characterized that the etchant la essentially consists of propylene glycol and a · hydroxide from the group of alkalis or alkaline earth metal hydroxide consists. 20. The method according to claims 18 or 19 »thereby marked that da · JUanittel consists essentially of the following substances: Nktriumhydroxyd '200 g / l Propylene glycol 150 evr / 1. 21. The method according to claims 18 to 20, characterized characterized in that the palladium grains deposited on the surface of the film by using the surface to senaibilisleren a solution is treated which is essentially aua 152-79 Tin dichloride 70.g / l 36 # hydrochloric acid 50 cn ' Sodium Lauryl SulXate- 0.5 g / i ' is then treated for activation with a solution which essentially consists of Oil volume 10 g / l consists, and then to a core with a Löeuhg is dealt with, which is essentially Palladium chloride 0.1 g / l 36 # hydrochloric acid 1.0 cmr / l consists. 22. The method according to claims 8 to 21, characterized characterized in that the non-electroplating solution consists of the following substances includes: Cobalt sulphate (CoSo ^ ' 7H ₂ O) 30 g / l AmiiiOniurichlorid · 50 g / l Potassium Sodium Tartrate 50 S / l ' Sodium hypophosphite (NaPO ₂ ⁴ H ₃ O) 20 g / l ABiQoniumhydroxyd, to divide αβη pH value 10 · divide. 909831/1122 BATH ORIGINAL