DE1694741A1 - Process for the production of laminates - Google Patents

Description

EoI. BH POSOi DE KEMDUKS AND COMPANY * TOth and Market Streets, Wilmington »Delaware 19 898, VoSt ₉ A *

Process for the production of laminates

The invention relates to the production of laminates from Polyiniide filaments and fluorocarbon polymerisate foils · As many Polyimide films are made in such a way that two adjacent film surfaces do not under the action of heat tile together, no hot references can be achieved for inside. If such a pole is to be made heat-weldable, "it must be coated with a coating" This results in the problem of »finding the right material that, on the one hand, depends on the high temperature properties of the Polyimide film makes use, and on the other hand is helssvero-weldable and adhere to the polyimide film reads.

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1634741

The invention relates to a process for the production of SchicÄtstoffa from .'olyimidfclien and fluorocarbon polymer films * which * », because it is characterized as a. Laminate made of at least one polyimide film and at least one adhesive sheet made of a copolymer of tetrafluoroethylene and hexafluoropropylene is heated to 350 to 500 ° C for at least 1 second. An intermediate process that can be used in the context of the invention is to apply the polyimide film and the adhesive perfluorocarbon polymer film for a period of more than 0.05 seconds, preferably at a pressure of? up to 70 kg / om and a temperature of 240 to 250 ° C, through a whale and on a hot Tronael and to heat the solute for longer than 5 seconds to a higher final temperature of preferably 400 to 475 ° 0. The latter heating can be done with the help of: radiation heaters or hot air. When a double-side coated polyimide film is to be produced, it may be "it the above-described system in two aufer.nanderfolgenden Verfahrenegängen work, or can be the film in a Terfahrensstufe produce _f by considering all the: three layers of the laminate equilateral by the Walnencnmci. leads through.

209810/1410

Under the heading "sticky fluorocarbon polymer film", a film is to be taken, as it is described in the French Pavilion 1; 96 73), according to which the adhesion of the * Polieno jer £ ls.ahe iuroh treatment The perfluorocarbon polymers and resinous copolymers of 95 to 50 wt. · 4> tetrafluoroethylene units and 5 "to 50 wt ®ntsohrift 2 833 686 is described as “The torsion-resistant mipopolymers contain 7 to 2 ^{r /} Ctow · ~ $ hexafluoropropylene units ·

! The PerfluorlEofelene ^ c-ffpoljnBerxsatfolie and the polyimide film can be Diclcea of about 6 μ or :? have less to 250 μ or more,

31 & Perfluorkoblens ^ clffpolaTBerxsatfolie can be treated at room temperature or at higher temperatures with electrical discharges. "The durability of the effect of this Baliandluzvg" doh · the adhesive or iüe'oe property, is increased if the iPolie during treatment at higher temperatures than

Rauaitöffperatur, aB _e aixf, 50 to 100 ° C or more, holds. The treatment for higher temperatures can be carried out in a conveyor belt, bsi dit at high temperatures extruded to the film an “electrical discharge device is introduced” before it can cool down to room temperature ο

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_H 1894741

P-1507

Me polyimide foils, if they are introduced into the mouth of the roll during the production of the laminate BB Kusamrnen with the adhesive perfluorocarbon polymer film, have a moisture content of not more than about 1 $ ew <> ~ £? otherwise many bubbles will form in the laminate during its manufacture. The moisture content is preferably less than 0.5% by weight. The moisture can be removed by pre-drying the polyimide film at about 400 ° C.

The polyiraid foils used in the tap of the irfind-.mg should I test the polymers that have the following precondition own:

m S ⁴ '^ ei th of the general formula η units of the general formula

ρ units C & x general-au.eiri'sn ponoel, -..- oR ^ -O-KH lind

q Units of the general formula ..oL,., ₀

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P-1587.

The ± η the above general formulas beds and bonds have the following meanings:

a) R ^ igt a tetravalent organic radical with at least two carbon atoms, which is bonded to four carbonyl groups »of which no more than two are bonded to one carbon atom each of the four-figured radical * Rg is a trivalent organic radical with at least two Kohlenetoffatomen, the mi three carbonyl is bound, of which nich ^ more than awei to each at a carbon on "the trivalent. Are bonded moiety "R * 1st * a divalent organic bouylgruppe first reads with at least one carbon atom of a Ca3 s., And a Stickstof t atom. R * is a second divalent organic radical with at least two carbon atoms, which is bonded to two nitrogen atoms, which in turn are bonded to different carbon atoms of this divalent radical.

b) jade is free bond indicated by a prime bound to a bond marked by a dot * and every sin marked by dots is ax one tied by a line ge] ;: onm; one bond.

o) m, a, ρ and q, f can ti en \ er t Hull or mean integers o

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ΪΜ587

d) The sum m -f η + ρ + g. must be big enough for that Polymer has an internal viscosity of at least 0.1, preferably at least 0.3 »determined on one 0 * 5 gow .- ^ tigon solution in fuming nitric acid at 15 ° C, has *

e) The value 2 m is greater than or equal to p.

f ) m + η a q.

Condition e) means that the number of Xmid bonds in the polymer chain is as large or larger than the Looked! of the affiid ties. It results from the following predominantly

m units with d «m heat E ^ contain Zm Xmid bonds;

η Srinheittn old. dta remainder R «contains η Xaid bonds and η

ρ unit of the remainder B ^ contain ρ aaidbindungeni (the Reete jft «contain neither laid- nor asidbindings) j the SeB & atssahl iet Iisidbindungeni is 2 a + n; the (Heaataahl der AnidMSfdungeii deceives η + p.

Therefore, if the Ansah! that Iaid bonds should be as large or greater than the number that AM l bonds should be, aase 2 m + η equal or greater than η + ρ, or more simply put, Z a Buss be equal to or greater than ρ

P-1587

Condition f) follows from chemical disturbance and is a direct result of condition b), which requires that the number of bonds indicated by a dash must be as great as the number of bonds indicated by dots. If the polymer is made up of units that _{contain R 1} -ReB-Ge imd or, or Rg radicals, then units must also be present that contain R, -rests-! Doho if to: · make the polymerizatee any amounts of tri- or partial carboxylic acids or functional derivatives of the same are used, then diamines must also be used The equation is jeopardized by the connections indicated by points

■ 2i + 2ntp «p + 2i _i su the pona of condition f).

The Haste Rj, H ₂ * 3% and S «are preferably aromatic radicals.

Preferably, let R ₁ is a vierwartiger aromatieoher group containing at least one sarbocyclisohen or heterocyclic ling with "Dencolar figs tingesättigten bonds contains" the four Garbonyrwgrupoim directly to separate Kohlenstoffatoma of Riiigea, j ibwaAex and each pair of carbonyl groups at benaclibe.:. Xa Kohl : substance atoms in a ring of the Restea H., gabunden ± a + .. ZiT AuEcruck "banachbart" means the o- or

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F-158 ?,

the peri position, oo that the dicarboxylic anhydride rings are 5- resp. 6-unit single

Preferably d:, e dicarboicylic anhydride rings are 5-membered rings of the following structures:

nt: η ti

'Ό-O-C C-O-O

it _ «ι

-C. - C- ^Odör -0 χ »0- ο ι ι

Preferably, B ,, is a trivalent aromatic radical which contains at least one carbocyclic or heterocyclic ring with benzene-like unsaturated bonds, the three carbonyl groups being bonded directly to separate carbon atoms. and θ Ln pair of carbonyl groups is bonded to adjacent sole atoms in a ring of the radical R ₂

R ^ and H ₄ are TorzugweiEie axylenreste, d, h «divalent aromatic radicals, which are in the form of a carbocyclic or heterocyclic ring with benzene-like unsaturated bonds, the two substituents being bonded directly to separate carbon atoms.

Polyimide films ,. a-.i £ whose one side or both sides of the invention device a!

~ ^β "209810 / U10

<j 1004741

-I58? .

ke, vem. tj-ne against high clay temperatures beet resourceful, lielsaveraGhweissbare? oiie is needed ..

Sin laminate genäss the invention in the diner on both sides of polyimide film a 3erfluorfcohlenetoffpolyinerieatfolie is aufkaßchiert, eats as aöleher heissvereohweleebaro A laminate which heiseverschwelasen from a Polyimiäfolie and only a per »fluorkohlenBtoffpolymerisatfolie ordered, can not easily μ? when the polyimide surface of the crooked toffee is placed against the 3? olyf luorocarbon fpölymerieatoberfläohe of the Sohiöhtstoffee '. The exposed perfluorocarbon polymer surface of a single, double-sided solitaire material can, however, be made adhesive by treating it with electrical discharges, as described above, and the so treated "strip-layered film" represents a precautionary approval of the invention.

ZweiacMchtlgd Sohiohtstoffe genäse the invention (dvh _e Schichtstoffβ from a Polylmidechicht and a perfluorocarbon polynerisateohloht.), Dreisohiohtige Schichtetoffβ (ie laminates of a Perfluorkohlenstoffpolymerisateohicht, ftiner Polyimidaiihifyht; and another Perfluorkohlenstoffpolymerisatechiloftt) dowie laminates nit was large en Anaahlen of layers oigaea become the Laminating onto other fabrics, neaondars onto metal? Such as aluminum, __

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i ₀ 1634741

j? -1587

3, B. can a Schiohfcatof :? from a polyimide film and a Perfluorltoblenatofi'poXjnuei'isatf olie on the perfluorocarbon polymerisatob'sr'lache ;, as described by Olsen v / earth to make this kUeofable; to do before the treated Surface with egg lern dliimec aluminum sheet of about 250 μ Thick or less bai temperatures above about 240 ° 0 below . brings into contact a pressure greater than about 0.7 kg / cm. Am such Sohie / i1; etaff s.us lolyisiid, Berfluorkohlenatoffpolyoerisat and aluminum is suitable for shielding electrical Ladders. Sr replaces the woven wire mesh shield and the. external isolation. In the case of these composite materials, aluminum is used primarily as an electrical one, it aims to strengthen the foliage height, especially at high temperatures, and as a carrier for the sohwäohere JLlujainiiuDBchioht, and the perfluorocarbon ifpolymerieato does not act as a binder 2 as above Both the aluminum layer forms a shield against it from e er θ elektrom & gnetisohe unfortunately and so prevents any external disturbance as well as copy effects between the conductors. she AluminiuEßohioht essentially absorbs all external electric fields and dissipates them. Depending on the Wunaoh, the Aluminum shielding to be grounded, as a rope of the electrical Strorakreisea use-1, or not "

I am a three-layer laminate made from a perfluorocarbon polymer layer, a polyamide layer and another

ORIGINAL BATHROOM 209810/1410

Perfluarfcohlenütoi'L'pol ^ iserisatBchicht can by treatment on a surface; how. described above, can be made adhesive, after which the treated surface is brought into contact with a thin sheet of aluminum, while at the same time a perfluorocarbon polymeriscti'o3J. In all cases, the adhesives μ f.shlge CberflSc-hp of the P & rfluorkohien3toffpolymerisates is contacted with the Alüiainiuia into contact. In this way, a five-layer vehicle is obtained from a perfluorocarbon compound, a? Polyimidsohioht, a Perfluorkohleiistoi'fpoljTn & rri.tatechlcht, an aluminum schioht and a Per.flucrkohlenusstüfi'i'Olymeeisohioht, which is suitable for the production / on line or pipes for the conveying of gases and liquids and is a hot-weldable composite.

represents. A laminate of this type is also suitable for the production of epiia. Left-handed spiral and the other right-handed eats. To improve the integrity of such lines or heights, they can be produced with crimps or corrugations. Olme fiolehe circular or spiral-shapedQH Kiffelusgt ϋ ± et «las I.ohr stiffer and breaks under strong bending & r. light: Eaeaantieno - ~:

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P-1587 .

The AluminiuzsscMca-i; of the five-layer laminate ee favored the formation of crimps and corrugations in the Tube, because bends' »of the Ealtea in the composite are easier preserved., it contains an aluminum layer. on this way las aluminum contributes to a structure? the ala "dead fallow" is called. The aluminum has another task, inde.B it acts as a barrier layer for those through the lei = tion of stimulating gases or liquids has an effect »As a result, fi © 2? In the presence of the poljimidschiciit, the pipe can be used under Bruek "even at temperatures of 603 ° C * without © to burst. The inner perfluorocarbon polymer is overturned binds the polylnid layer to the aluminum, while di® Ferfluorocarbon polymer makes the of the composite material during further processing

This © composed of the five-layer laminate © © ignet is particularly suitable for compressors v © a 2Qiuatisi © rungeaala »i @ a SM ^ Tow & BTVMg, from © KLorie ^ te» uad flüiorisrtea SoM. @ Awe®i © 2? = · Stoffen and other compressible gases or PlÜeeigk © it®a _e It is also suitable for diverting the hot exhaust from the air circulation. Another purpose of such a line is to use it as a scouring dumbbell for various hoses and pipes as a substitute for the metal mesh currently used for this purpose.

209810 / U10.

? «1587 ^: '...

This can be done with the aluminum composites mentioned above Aluminum sheet baw. the aluminum foil has a thickness of about 6 μ or less to 250 μ or more.

Also thick laminate which can be used as a spacer etc. are, let .raioii according to the inventive method build up · So you can build 125 μ thick insulator sections in one Work step with three 50 micron thick poly raid foils and one 25 micron thick.;, adhesive intermediate film made of perfluorocarbon polyi-ieri.sat produce. The same laminate is also used in two work steps according to the process Make 3 of the examples below 1 and 2, whereupon the Jroduki; of Example 2 on a different polyimide film on ^ sheer-is "Thicker soihtstoffe can be made from thicker foils! components or, by adding additional perfluorocarbons ^ stoffpc.lyfflerls & tachiehten and manufacture l'ölyimidsohiohteii «

In the following examples SiOH beßiehea the ropes "fall otherwise stated, let" on

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^ t ₁ 1894741

B _n a "is |> 1 β, 1";

A laminate made of a: c 25 _f 4- μ thicker. Polyimide film and an adhesive., 12.7 μ diel: en polie made of a copolymer of ie-ferafluoräthylsii and hexafluoropropylene is produced by. the polyimide film is continuously brewed in contact with the adhesive side of the pereluo carbon polymer film between a rubber pressure roller and a heated drum under a pressure of 14 k $ / am at a temperature of 245 ° lolyimid is AUB _t Pyromellitheäure and 4 »4'-DiaiDiaopiienyläth prepared" .R. This laminate from the Polyimideoli 3 and the Perfluorlcohlenetoffpolymerisat-.The film is then Durca a "heating chamber headed" where it is er'iitzt 10 seconds 450 ° C. D ± q Heissverschweiesfeetigkeit awisciien the PerfluocJcohrienetoffpor.ymerisatseiten is the Nanherhitcung vm the itinffache improves strength;. ier bonds of the Po Lyiraiö.oberfläche to the Perfluorkohlenatoffpolymerisatoberflächa is zero (at 375 ° C, 10 seconds, "Terweilaeit and 0.7.

The product of Bai game 1 is compared with a similarly made-up SöülehiJatoff, which is made with polyethyleneimine as a means to increase the efficiency of the perfluorocarbon to the perfluorocardium; a "to:? Fo" lyinerisat3chl: ^v ht vmd the polyimidschioht . bind ::! bol deassn production however the Kaoh-

treatment at 450 ° ^;; fortgaiaasea, samples of the two fo ··

"Ζ 1 & 94741

lien was then dv.r ih Her.esveracliweissön the two Perfluorkohlen3toffpolynjeri3iitsoi '; s »reciprocally connected. The aged zueammengeschweisstsn wcsrder films at 200 ° 0, and subtracted from time to time werderfreak * i ± e hoiesfeschweisaten compounds, their resistance to RNA. check .. After aging for 5 days at 200 ° C, the welded joints of the film made with polyethyleneimine have deteriorated to a strength of ITuIl. In contrast to this, the strength of the welded joints in the laminated material, which has been pretreated by heat treatment and produced without polyethylene im ± n, only falls to zero after 50 days of aging at 200 ° C

Example £

A laminate from a fluorocarbon polymer film _f a polyimide film and a second fluorocarbon polymer film is produced in one process by passing it through a DruakwalZim laminate press. The first perfluorocarbon polymer film is 6.35 μm thick, the "wide perfluorocarbon polymer film is 12.7 μm thick, and the polyinside film is .25" 4 μm thick. The perfluorocarbon polymer is * εΐη llia ^ hpolymBrisat from! Petrafluoroethylene and hexafluoropropylene, Daa Polyimii iat from pyromellitic acid and <-, 4'-D: iaminodiphenyXfith «3r hergastellt. The two perfluorocarbon polyacrylates each have a surface that can be rubbed on, the division of the laminate with the poly-

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P-1587

imidjiolie is brought into contact. The slides will Gradient from Ο, Οό Stand at 240 to 250 ° C under a®

Pressure of 21 'zg / sK bound to each other. The Heiesvers © hw © i festigkeif this 3 S jhi ah ta toffee is 260 g / 2-, 54 o® °

The same Sohlet material is then heated for different time © 'to different temperatures, with © ioh much stärkare SchwäiEsve _t ^ form bonds as the following table zeigtt

Heat treatment

Tamp., Time, sec. 464 (OK 460 450 '2 420 eo 405 *O

Strength of the weld joint, g / 2.54 on »

1540

600 1356

910

916

260

These ingredients are subjected to weathering tests. The results show that the eijier WäriDenaohbehandlung subjected laminate α as opposed to any heat-treatment uiatuizogenisn Kttntrollproben the strength of their SchweiseverbinduiogfiB. about läni; ere maintained time at higher temperatures * The following table shows the values for some of the above, genltexten at 200 ° C foil: '

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Ρ-1587

νχιά treatment

No Wärmenae aJbehgn Settin g

1 was aged 5 days gealtext Aged 10 layers

Heat untreated at 464 ° C

1 lay aged Aged 5 days Aged 10 Sage

Post heat treatment ::> at 460 ° C

1 lay aged 5 3? Agö aged Sage aged

Warming aftelianaiunfi at 45 0 °

1 lay aged 5 Sage aged days aged -

Strength of the visual connection, g / 2.54 cm

6 0 0

576 400

255

860 620 530

825 865 395

Example "?

A laminate consisting of a 25 »4 μ thick polyimide film, a 25.4 μ thick peri'lu carbon polymer film and a 25.4 μ thick aluminum foil is produced by combining the polylinid film, the perfluorocarbon film, which is adhesive on both sides, and the aluminum foil and the Sotitittatoff continuously between a Kau "-ae υζ.ά a '2rhi-; zteK drum with one pressure

carried out by 14 Irg / cia and eixor parts of 245 °

-1V-

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F-1587

will. The three-layer laminate is then in Qiner heating chamber heated to 450 ° C. Through the post-heat treatment the strength of the welded joints around the Increased five times.

Example 4

A laminate made of a 12.7 μ thick perfluorocarbon polymer film, a 25.4 μ thick polyimide film and a 12.7 μ thick perfluorocarbon polymer film is produced according to Example 2 and then treated as described above to make a surface adhesive a laminate made of a 12.7 μ thick perfluorocarbon polymer film, a 25.4 μ thick polyimide film, a 12.7 μ thick perfluorocarbon polymer film, a 76.2 μ thick aluminum film and a 12.7 μ thick perfluorocarbon polymer film is produced, by the klebfähi £ e page aatfolie of Schichtatoj'fee of dtr perfluorocarbon i, which - PoIyUn: dfolie uni second Perfluorkohlenatoffpqlyineris & tfc »IU ait ier 6.2 μ thick aluminum foil in ■ contact _e; ebre, i ch"'ur?._;? d same-jitig said adhesive side of the L 7 μ dioken Perflucrkohl3nst "ffpolynierlsatfolie with the other side of Aluiid niv.mf ^ lie is contacted and *

2 c of this layered soli v.nber sineii pressure of 28 kg / cm at 240 i! is guided through a »Druckwiliign Sohichtntoifpresse«

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/"1

F-1587 ■

16S4741

A similar sent material is made with a 50.8 μm thick polyimide film manufactured. In both cases, the post-heat treatment the strength of the welded joints is increased by a factor of five.

Example 5

The procedure is as in Example 2, with the three layers initially for a period of. 0.06 seconds at 248 ° C below

a * pressure of 21 kg / cm "can be exerted.

A bearing on the film is post-treated at 469 ° O for 17 seconds.

The results are as follows

Not post-treated Naoh-treated - ■ " (g / 2.54 approx) (g / 2.54 cm)

Strength of the weld

compound 410 760 g

Abiiiebföstigkeit (Polyinidfolia and 12.7 μm thick
Perfluorkohlanstof t polymer film) 276-880

A. peel strength (polyimide ■ film and 6.35 μ thick
Perfluorocale (3nstoffpolyraerisatfolio) 192 880

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2098 10 / UIO

F-1587

Example 6

The relative behavior of a real laminate made of polyimide and perfluorocarbon polymer, which has been produced with a polyethyleninine as an agent to improve the adhesive strength, and a laminate made of a polyimide film and a perfluorocarbon polyamide film that has been post-treated by heat treatment and is produced without an agent to increase the adhesive bond has been, * is determined as follows. Two layers of the carbon fiber are each wound around an electrical conductor wire. Each Sohioht overlaps the ■ :::;: · ■■■ defe luo 50 $>, and the wide winding is applied in the opposite direction to the first, ie as a reverse spiral. The wire, which is wrapped with the polyimld / perfluorocarbon polymer © = ": i? Isat ~ Schiohtstoff, which was made with the polyethylene" imine as a means to increase the adhesion, has a first, 25.4 μ thick winding layer made of a polyimide film, Polyethyleneimine and a 12.7 micron thick parfluorocarbon polymer film (with the perfluorocarbon polymer side facing outwards) and a second winding layer made of a laminate consisting of a 12.7 micron thick perfluorocarbon polymer film, polyethyleneimine, a 25 »4 micron thick polyimide film, and polyethylene imine μ thick fluorocarbon polymer film. The wire wrapped with the laminate made from the polyimide film and the perfluorocarbon polymer film, which has been post-treated by heat treatment, is

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SM 587 ■ ". -

There are two windings _{: one} of which consists of a post-heated carbon made of a 6.35 μ thick perfluorocarbon polymer film, a 25 »4 μ thick polyimide film and a 12.7 μ thick perfluorocarbon polymer film, the 12.7 μ thick Perfluorocarbon polymer film is on the outside. Taking into account the overlap into consideration, therefore, the electric Leitungsdraht.in both cases by a laminate isolated from the μ PoIyiiaid having a thickness of 101 _r 6 and Perfluorkohlenstoffpolymerieat consists μ with a Dlcke of 76.2 ·

After winding, the insulating saddles are hot-welded by passing the wrapped wire through a 1.22 m long oven at 427 ° <3. The heat exposure time is t minute. After this treatment, the insulation of both wires is extremely difficult to unwind »Usually the film tears before it can be unwound to be underlined. ■.

Dia Wid0rsfcandß.barenj; ei'i; The outer coating of the two wires against the impingement of a temperature of 200 ° 0 is determined, aidejn 76 _f 2 cm long samples are aged for various periods of time at 200 ° C. Compartment for aging, one end of the wire is attached to a mandrel with a diameter of ^{12.7 V mm}

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The mandrel set in rotation by an electric motor and the other end of the wire is loaded with a weight of 1.36 kg * The entire length of the wire is wound onto the dome under this tension. Then the direction of rotation of the motor vice versa, the wire is unwound and then rewound in the opposite direction. That way the wire becomes wound and unwound twice in succession. The wire coils are then checked for breaks in the insulation (after the fourth step) resolved When no breaks can be detected, they are doused / thawed in a .15% solution of sodium lauryl sulfate, The electrical potential difference between the aqueous solution and the () conductor wire is increased so that it

is 3000 V for 30 seconds. Samples of this high tension Resist 1 minute is enough for the "dielectric • Ceet".

} l The results are as follows:

With the laminate

_ 'made of polyimide, poly- With the post-heated

Time of furnace ethyleneimine and per- laminate made of poly-

treatment for flv.ocarbon polyimide and perfluorocarbon

200 ° C in front of the merisate, wrapped in lenstoffpolymeriBat Test wire wrapped wire

10 days) fails with the dielek- Sufficient for the dielectric-

20 "\ tric test see test

3Q H It Il Il Il

40 »ι - - η '.-N ti η

50 w Ii ti ti ti

50 at H η Ii Ii

¹ JQ »η it it μ

QQ «η n .it Ii

2038 10/1410

Claims (1)

ZZ June 29, 1966 E.Iο du Pont de Nemours and Company F-1587 Claims 1. A process for the preparation of laminates from polyimide and ^ luorkohlenstoffpolymerisatfolien, gekennzeiohnet in that a laminate of at least one polyimide, and at least one iclebfähigen film "inen copolymer of fe trafXuoräthylen and hexafluoropropylene at least 1 Se" Irande 350 heated to 500 ° C will* 2. The method according to claim 1, characterized in that the laminate is heated to 400 to 475 ° C for longer than 5! Seconds. 3. The method naoh claim 1 or 2, characterized gekennzeiohnet »that the polyimide film has a moisture content of not more than .- ^ has. '■ 4. The method according to claim 3, characterized in that the polyifflid film has a moisture content of less than 0.5 % by weight. 209810/1410 5. The method kebab Aaepruea 1 Me 4 'there & upon gs & eanseiöbaet, daee the spolia Naeh dea HLebfaiaigeaohen sindestsne a surface of the Tiuorkohienetoffpolyaerisatfolie by elektriaelie EatladungBbeliandlwisg each sub adhesion £ "braoht verdtsi» indene they sdndeet "ae 0 _t 01 seconds in a WaXsensnmd TANTER a Druok τβη ninäeetene 0.7 && / oss ² at 240 to 280 ° 0. 6. Procedure according to inepruea 5 _t Saduroh identified »that Pressure treatment in Sea Walsenanrnd for ainStitens 1 SelcuMe at 7 to? 0 feg / οι / land 240 feie 260 ° 0 a «? Eag« £ iiSu? T β method naoh claim 1 bie 6 'dadureh gek "nnseiahnet _e that ein® luorkohlenatoffpQl | ioerieatfolie TezwsnSet is that ew a copolymer of S5 to 50 6EW · - ^ fetrafluoräthylea units and 5 to 50 @ ew · - ^ is EezafluorprepyXeneinlieiten?. 8. Method according to claim 7 »characterized in that a copolymer is used» which contains 7 to 27 ®ew _e - $ H®2Cftfluo propylene units « 9 »Method according to claim 1 to S _9, characterized in that the fluorocarbon polymer foil © is kept at a temperature of at least 50 ° 0 during the treatment of electrical charges to improve its life. - ² - '2098 10/1410 . 189474t ! «1587 - c The method according to claim 1 "to 9, characterized in that a Polyiffliafolie is used, the polyioid of Pyroaellithsäuro and 4? 4- '~ riaininodiphenyl ether is produced. 11. ' _F laminate prepared nash claim 1 to 10, characterized in that it consists of a Fluorkohlenstoffpolymerieatechicht, eintir P0I3? imide ohioht and a fluorocarbon polymer ioatstthiöht. 12. Laminate, produced according to claim 1 to 10, characterized in that that it consists of a polyimide layer, a fluorine » 'Carbon polymer coating and an aluminum layer. · 13, layered fabric, produced according to claims t to 10, characterized in that that it is made of a fluorocarbon polymer, an iolyimideohiclit, a Pluorkohlenatoffpolyaerisatschioht, an aluminum layer and another 'fluorine fi; consists· 3— 20-9 * 10 / Ϊ410