DE2335838A1 - TRANSFER MATERIALS - Google Patents

Description

Docket LE 972 024 /
972 030

INTERNATIONAL BUSINESS MACHINES CORPORATION

Armonk, N.Y "10 504, USA

^^ ■ * * ΞΪ S ^ B «SS ^ Bb VH> M * 4V | C "" ^ B "

Transmission materials

The present invention relates to transfer materials and in particular typewriter tapes.

Typewriting mistakes have been made since the first Typewriter was invented. The associated problem has been attempted to solve in many ways, including the Development of an erasable postal paper that allows the wrong letters to be entered manually using a normal one Pencil or typewriter erasers made from rubber or a combination of rubber and a slip material to erase. Other recent techniques for correcting typewriter mistakes include covering up the wrong one Letter or symbol to cover it up and give the impression that no mistake has been made. To do this will be applied various techniques. One technique used is to use a liquid that is a pigment or contains a pigmented material in a volatile carrier liquid. The correction material is on the wrong one Letters painted and left to dry. It then sticks

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on the sheet described and results in a relatively inconspicuous one Correction. Another technique used is a dry transfer material to cover the wrong one Letter used. The material usually becomes a thin layer on a film or carrier sheet, in a similar manner such as carbon paper, formed and then used with the wrong letter to form a thin white layer or Layer of another desired color to transfer onto the surface of the wrong letter and so partially if not completely to make invisible.

There are also publications that focus on correcting typewriter screeching errors using tape or adhesive material, but the technique used tears the surface of the written sheet, since the fibers of the paper are actually torn out of the sheet to sufficiently remove the false mark. This is necessary because the color of the ribbons has hitherto had the ability to penetrate the paper fibers and the paper afterwards to permanently dye the print «The fibers therefore had to be physically removed from the surface of the paper to remove the image.

It is the main aim of the invention to have symbols and signs on one Map sheet, easily by pressing adhesive material in intimate contact with the letters or at the same time Images are correctable,

Another object of the invention is to equip typewriters with automatic correction option with an adhesively correctable typewriter tape.

It is also a goal of the Erflndu-u-, a sheet of characters to provide a type by application and to generate an image that is created by adhesive contact between a correction dddem Image can be removed practically completely.

Another object of the invention is to reduce moisture the sensitivity of such a person; 3ands during its manufacture.

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According to the invention, a transfer material that is subsequently is referred to as tape or typewriter tape, below "Use of the residue of a solvent coating mixture to form a transfer layer, which is also referred to as paint or color layer. The color layer is applied to a flexible thin support base * The remaining coating of the solvent coating mixture, that forms the color is preferably made of a film-forming resin that is hard rather than waxy or light is a crumbling resin and which is made brittle or fragile by the addition of a modifying agent without the resin being essential to soften, educated. A second modifying material is added, if necessary, to the color layer from the support base or to make the film removable, but so that another there is a relatively high tendency to stick to the paper. The resin is preferably not substantially plasticized because it is plasticized smearing and soiling increases and adhesion to the sheet to be written on, resulting in poor error correction leads.

According to the invention there is thus a transfer material or typewriter tape created that can be used to write or print a letter or character, the letter, if it is wrong, it can be removed adhesively. The tape is made of a hard, film-forming resin under selective Modification of its properties by adding additives that make the film brittle and the resin more adhesive for the make surface to be written on, whereby the resin does not penetrate into the fibers of the paper surface to be written on and is self-adhesive. Over time, there is increased adhesion to the paper fibers, making the image more durable.

Correction of misspelled letters or symbols can be done by adhesive removal from the surface of the text Sheet or paper using a piece of material that has an adhesive surface, if the adhesive surface on the misspelled letters

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is pressed on. The adhesive surface of the correction material adheres to the letter, and when the correction material I is peeled off from the paper, the letter is also peeled off. The resin used in the preparation of the color layer must be in a modified state to a degree cohesive to which it holds the color layer together for removal and does not crumble, since the adhesive
The surface of the correction material only comes into contact with a surface of the color layer. When the resin has an insufficient cohesive effect, only the exposed portion of the wrong letter is removed and the rest of the image ink layer remains on '■ the label sheet adhere, and it remains as a residual
Bild, The cohesion of the color layer must be greater than the affinity of the color layer for the paper or the writing surface.
The color layer must be composed in such a way that the adhesion is more like a surface adhesion between the color and the paper
as a viscous penetration of the paper fibers or wetting of the paper fibers with the color layer. Preferably, no dyes are used for coloring the colored layer, since dyes generally have a coloring power and coloring should be avoided. Dyes only mean colorants that are soluble in other components of the color mixture.

The adhesive correction materials, the behavior of which has proven to be the most advantageous, are substrates, preferably made of polyethylene terephthalate, which are coated with an adhesive based on rubber or acrylic. In general, silicone adhesive materials appear to have limited utility or only to be useful on certain papers. If the adhesion attraction for the paint does not exceed that of the paint for the paper, only occurs
partial removal of the wrong letter.

According to a particular embodiment, the requirement for additives to increase the edge delimitation can be eliminated
and any adverse effects from some of the required modifying materials can be eliminated through the use of a particular solvent mixture.

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Here, the tape is made of a solvent mixture with relatively high proportions of toluene and correspondingly reduced Quantities of isopropanol formed, i.e. the paint layer is made from a solvent mixture of toluene and isopropanol with a relatively high content of toluene for Control of any adverse effects of modifiers without reducing their desired properties upset.

In the following, the invention is intended to be based on a preferred embodiment men are explained in more detail.

The following explanations of the function of the special materials represent an attempt at a good explanation as the interactions are not fully understood.

The paint layer on the transfer material or tape will be off carefully selected materials are prepared, which give the special property that the color layer is essentially completely removable by adhesion from the writing sheet onto which the ink was transferred during typewriting is. The properties of the materials that are required to make a tape of the type that requires adhesive removal is possible to produce, are explained according to the previous knowledge about this.

The main component of the color or layer of color of the tape with the possibility of correction is a resin. The resin has to be a hard * Resin as a waxy resin, furthermore, the resin must be a resin that is soluble in a solvent in order for it to be the coloring composition in a solution / dispersion form in a volatile carrier liquid can be applied.

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It has been found that the resin should be a forming resin to achieve the necessary cohesion in the paint layer, that has a high degree of flexible integrity and is not so easily crumbled or flaky as to peel or flake crumbles like wax. To achieve the necessary adhesion between the pressure sensitive adhesive material and the paint the resin has to go through most for the production of Druckemp « sensitive adhesive materials, for example rubbers and acrylic materials, be easily wettable.

The resin is preferably of the form which, in spite of the contact with the paper and the paper fibers, does not get into the surface of the Paper penetrates. This property is important as it allows the relatively easy removal of a misspelled one Letter allows.

The resin acts as a carrier, holding agent, or binding agent for others Components of the paint layer.

Typical resins that have the above properties include EAB 500-1, a cellulose acetate butyrate commercially available from the Tennessee Eastman Company, Kingsport, Tennessee istj Vitel · 222, a polyester resin available from Goodyear Chemicals is available; Neocryl B-371 »an acrylic copolymer, commercially available from Polyvinyl Chemicals Inc. (described in Company Bulletin C-11A); Emerez 37 ^ 9 and Emerez 1530, which are polyamides and are commercially available from Emery Industries (described in Emery Technical Bulletin No. 446A) i and EAB 550, a more flexible cellulose acetate butyrate, commercially available from the Tennessee Eastman Company, Kingsport, Tennessee.

As you can see! Ich Int, bulged Iode :; dot ¹ materials listed above have their own special physical and chemical properties. Each of these resins is suitable for producing a color mixture for adhesive correction, but can one under circumstances more favorable than that other leg and untor-GGhiedlioh affect forward oh lcnfatwm l'nplcvon.

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The preferred resin is Emerez 1533 available from Emery Industries is commercially available. It is believed that Emerez 1533 is a diphenolic-based polyamide, dimer acid-based, with a softening point from about 98 to 102 ° C, a viscosity at 160 ° C of 26 to 34 P and an amine number of 5.2 mg KOH / g and an acid number of 2.5 mg KOH / g. Emerez 1533 has a density of about 8.3 pounds per gallon (described in Emery Technical Bulletin No.

To modify any of the foregoing resins to '-die-. sen will become an ultimate physical property desired to impart decreased tensile strength or film integrity Additives incorporated into the paint layer composition.

In order to achieve a sharp character delimitation according to Be * To make impact with the type sufficiently easily friable or brittle, it is necessary to check the tensile strength of the to degrade the resin formed after deposition from a solvent film. It is desirable to avoid excessive softening of the Resin to avoid, as softening the. Resin waxy or waxy power and its removability from the paper surface ! lowers. The weakening of the tensile strength or degradation of the The tensile strength of the film formed by the resin appears to be a result of the tendency of the resin's polymer chains to entangle to be disparaging addition. This reduced entanglement of the molecular chains in the resin continues the film-forming process Property down to a point at which the film compared breaks easily to its unmodified state. The preferred one The modifier used to reduce the tensile strength of the resin is a mineral oil. Mineral oils can be used within a relatively wide range of viscosities and properties can be selected to meet those required for each individual resin To achieve degree of modification. A preferred mineral oil is white oil, especially Standard No. 34 Kyso white mineral oil, the commercially available from the Standard Oil Company of Kentucky.

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In general, a second modifier is required to make the ink layer less adherent to the substrate or to make the pile material to which the color layer is applied to form the transfer material. In general one such film is a polyethylene film, but it can also be any other common film used in tape manufacture will be.

Preferably, the release properties can be added to the paint mixture by adding mixed fatty acid octyl esters during preparation be awarded. An example of the suitable esters that can be used to act as release agents is ! a material commercially available under the trade name "Plasticizer I R-9-C 7025" by CP. Hall Company, Chicago, Illinois, or FMC j is available (mixed fatty acid octyl esters). The Plasticizer I R-9-C 7025 acts as a plasticizer or plasticizer in In the more classic sense, as it modifies the resin material so that it has an adhesiveness to the paper which is increased, but not so strong that the adhesiveness for paper is so great would be that the images could not be obtained by vigorously contacting their exposed surface with an adhesive coated surface can be removed. Other known modifying agents include plasticizers or plasticizers of the fatty acid ester type, such as, for example, isopropyl palmitate and butyl stearate. These other agents work similarly to the Plasticizer R-9-C 7025

: For additives that can also be added if necessary, i.e. that they are generally not required in every preparation, but are required in certain compositions Depending on the proportions used or the special properties of some materials, an epoxy material is one of them of the polyglycol diepoxy type. The addition of such a material, ; such as DER 736, an epoxy resin solution available from the Dow I Chemical Company, Midland, Michigan (polyglycol diepoxide, described in Dow Bulletin Dow Flexable Epoxy Resins), serves to further improve the edge delimitation of the images created during the writing stage by means of a slight softening of the resin, the removability not being lowered.

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To further possible additions to the solution of an isolated problem includes the addition of a synthetic wax. One such synthetic wax is Acrawax C, a synthetic glycol-based wax, manufactured by Glyco Chemicals. The addition of synthetic waxes to the Parb composition has the effect of to prevent oil migration to the parbo surface if a larger amount of mineral oil used as a hardening and brittling additive will. Oil migration creates handling problems and the tape does not run properly in a typewriter. Such an amount of mineral oil is in some cases required for an adequate modification of the resin so that a Migration problem occurs, leading to surface concentrations Mineral oil leads.

In all compositions it is necessary to include a colorant when the transferred color layer is in contrast to the Paper background should be visible. Preferred materials for coloring include soot «Other possible materials are different colored pigments which are not soluble in the selected modifying oils. Organic dyes can be used as Pigments are used when they are in the modifying oils are insoluble.

It has been found that moisture is a factor with a large influence in the manufacture of the tape for adhesive correction. The role played by moisture is not fully understood, but it is believed that there is an effect on the film structure of the film-forming resin as it separates from the solvent vehicle during drying to form the color transfer layer. It has been found that if the humidity is too high or too low, the removal of the masked mark is incomplete and unacceptable. It is assumed that the temperature of the coated with the color-mixed web is reduced to such a value by the evaporation of the solvent from the ink composition, a small amount of moistures-t ^"e from the atmosphere on the surface of the tape-condensing during the drying of the solvent mixture -

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sated. It is believed that the formation of water droplets or moisture spots on the surface of the paint layer affects the formation of a discontinuous film and also affects the way in which the materials of the paint composition are deposited. Useful removal results are obtained when the humidity in the manufacturing room is such that the film is coated with the paint mixture and then exposed to air containing from about 0.005 to about 0.012 kg of water per kg of dry air. Best results were obtained in the range of about 0.006 to 0.009 kg of water per kg of dry air.

In the above-mentioned particular embodiment, the color layer is applied by solvent coating from a solvent mixture of toluene and isopropanol with a relatively high ratio of toluene to isopropanol. It was initially assumed that only small amounts of toluene would be acceptable. Toluene has / u bring the effect of the mineral oil in solution, which does not occur in a pure Isopropanolsystem, and that an increase of toluene would be detrimental, but it has been shown that such a beneficial effect on the moisture sensitivity of the ink layer. The use of a solvent mixture as described here makes it possible to omit components which act as edge-limiting abrasives and oil migration-preventing agents.

The following examples serve to further illustrate the invention.

For the sake of simplicity, a full staged manufacturing process fV? a composition described, it being noted that the other compositions in the same or in an analogous manner using the other mentioned

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28, 6 % 30th 23, 8 % '25 19th
28, 0 %. - 20th
50

- 11 -

Materials, various amounts, or other solvents getting produced. All ingredients are listed with a percentage that is the percentage of that ingredient in the complete dry paint mixture or the dry paint layer. The materials are processed in an analogous manner to the of the first example, the quantities and proportions the solvent can be adjusted.

example 1

Solids percentage parts by weight

Harz (Emerez 1533)
Mineral oil (standard no.34
Kyso White Mineral Oil)
Plasticizer (plasticizer
RQC 7025)

Pigment (Mogul L) (A carbon black available from Cabot Corporation, described in the bulletin "Cabot Carbon
Black Pigments for Ink, Paint, Plastics. Paper)

The Emere-z 1533 is dissolved in a solvent mixture of about 5 / b isopropanol and 1/6 toluene. The amount of the mixture used in the preparation of the resin solution is about two parts by weight of solvent mixture to one part by weight of Ernorez 1533 resin. After the resin has completely dissolved, one part of carbon black and one part of isopropanol are added per three parts of resin solution. The mixture is then ground for about 9 hours or so long until a sufficient fineness of grind is obtained and discharged and filtered. A solvent mixture with a solvent ratio of 3 ^ 4 parts of isopropanol to one part of toluene is prepared. To five parts of the above medium grain solution are added one part of Plasticizer R-9-C 7025 and 1.25 parts of Standard No. 34 mineral oil and mixed thoroughly. 7 * 5 parts of the above dispersion and 11.5 parts of the solvent mixture are added to this mixture with stirring. The resulting mixture is then coated onto a substrate, preferably a 0.0.19 nanometer (3/4 mil) film of high density polyethylene. The mixture is at 18 to 38 ⁰ C (65 to 100 °?), Before

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preferably at room temperature, up to a coating weight of about 0.45 Ms 0.6J5 kg (1.0 to 1.4 pounds) per ream (193.5 m: 300,000 inch ² ) and ± one dryer for one temperature (up to 14O ° F 100) dried at about 38 to 6O ⁰ C. The humidity is maintained at about 0.006 to about 0.009 kg of water per kg of dry air during coating and drying.

The following examples can generally be found in the above Composition of the solvent mixtures in relation to the other Ingredients described in proportions are prepared, the percentage by weight of each ingredient of the total dry paint coating is indicated.

Example 2

Mineral oil (Nujol) (made for medical

Purposes of Plow Inc.) 35 ■ *,

Harz (Emerez 1533) ^ ^

Pigment (Mogul L) 25 'i

Modification agent

(Acrawax C) 5 ^

The above materials are prepared using the work where i:; e; i of Example 1 and brought together to a mixture with 20 ^ non-volatile components prepared with a solvent mixture, the a mixture of 1, 1,1-trichloroethane and jGopropnnoI is in a ratio of 1: 7. This mixture is then applied to a 0.019 mm (3/4 mil) film of high density polyethylene sen and dried into a transfer material »

Example 3

Plasticizer (isopropyl palmitate) 10 %

Mineral oil (standard No. 34) 25 %

Resin (Emerez 1533) 35 %

Pigment (Mogul L) 25 %

oil migration preventive agent (Acrawax C) 5 %

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This mixture is prepared according to the procedure of Example 1 and coated from a solution of 20% nonvolatiles in isopropanol on a 0.019 mm (3/4 mil) film of high density polyethylene.

Example 4

Plasticizer (butyl stearate) - 10 %

Mineral oil (standard no. J54) 25 %

Resin (Emerez 1533) 35 %

Pigment (Mogul L) 25 %

oil migration preventive agent (Acrawax C) 5 %

The above materials are formulated with isopropanol into a 20 % non-volatile solution following the procedure of Example 1 and cast onto a 0.019 mm (3/4 mil) film of high density pol.v äthylen to give a transfer material vu o: i ι the.

Example 5

Mineral oil (Clearteck) (white oil, available from Penn-Drake, described in Bulletin No. 668) 25 %

Harz (Emerez 1533) ^ 5 #

Pigment (Mogul L) 25 %

oil migration preventive agent (Acrawax C) 5 %

Following the procedure of Example 1, the mixture is processed with isopropanol to form a solution with 20 % non-volatile components and applied as a layer to a 0.019 mm (jjA ^mil ) backing film made of high-density polyethylene.

Example 6

Mineral oil (Clearteck) 29.2 %

Resin (Emerez 1533) 53.7 %

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Pigment (graphite) 9.8 %

Pigment (Mogul L) 2.4 %

oil migration preventing agent (Acrawax C) 4.9 %

Also following the procedure of Example 1, the above materials are made into a 20 % non-volatile solution in isopropanol and cast onto a 0.019 mm (3/4 mil) backing film of high density polyethylene to form a transfer material.

Example 7

Plasticizer (Coconut Oil; Cochin Type Coconut Oil) 20 % Resin (Emerez 1533) 50 %

Pigment (Neo Spectra AG Beads) (strongly colored soot with small particle size, available from Columbia Carbon) 25 % anti-oil migration agent (Acrawax C) 5 % '

This mixture is made into a 20 % non-volatile solution with isopropanol and cast onto a 0.019 mm (mil) film of high density polyethylene.

Example 8

Mineral Oil (Penteck) (low viscosity oil available from Pennsylvania Refining Co., described in Bulletin No. 668). £ 5 plasticizer (Texanol isobutyrate) (available from Tennessee Eastman, listed in Bulletin No. P-13I 40 % Resin (alcohol-soluble propionate; Alcohol Soluble Propionate (a cellulose acetate-propionate resin available from Tennessee Eastman, described in American Ink Maker, January 1969) 43 % pigment (Neo Spectra AG Beads) £ 12

The above materials are processed with ethanol following the procedure of Example 1 to form a 20% non-volatile solution and then cast onto about 0.009 mm (0.35 mil) film of polyethylene terephthalate (Mylar) to form a transfer material form.

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Example 9

Resin (Emerez 1533) 35%

Mineral Oil (Standard No. 34) 20 Ji

Plasticizer (Plasticizer R-9-C 7025) 15 %

Pigment (Mogul L), 25 %

Migration preventive agent (Acrawax C) 5 %

Epoxy resin (DER 736 Epoxy Solution) '1 part each

■ 100 parts of solvent

Following the procedure of Example 1, a mixture with 20 % non-volatile constituents is prepared using isopropanol and toluene and added in an amount of 0.8 kg (1.8 pounds ;;) per ream to a 0.019 ™ (3 / ^ niil) Polyethylene film · applied and ^{dried in the oven at 49 0} C (120 ⁰ F). The resin is in EJN% isopropanol / toluene mixture in a ratio of 5 'u 1 ^z eiiiur solution with a content of dissolved i / 3 solids. The residual solvent at £, ef '<-' ~ is only isopropanol. Isopropanol is used in an amount such that a final ratio of toluene to isopropanol in the coating solution of about 1 : ^; lG, 125 is available.

Example 10

The procedure is as in Example 1, but a ratio of toluene to isopropanol in the coating solution of about 1: 4 is used. This ratio is extremely advantageous FO % isopropanol with a tolerance of -5.

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733R838

When removing letters printed by the overlay of a type with any of the transfer materials prepared above, it has been found that there are several tapes that are particular are useful. Pressure sensitive tapes designated by the designations Y9272 and 853 and 351 are from the Minnesota Mining and Manufacturing Company (these tapes are described in the bulletin "Scotch φ Brand Industrial Tapes"). An adhesive tape designated Product No. 7321 is available from Borden Inc. Chemical Division (described in Institutional Brochure No. I69IB) and tape that comes as a product No. 4 ^ 0 is referred to is from. of the Nashua Corporation, Nashua, New Hampshire.

When preparing and manufacturing the ribbons above, this should be the case

Coating weight, humidity, dyeing temperature and

the drying temperatures are preferably kept according to Example 1 will.

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Claims (1)

- 17 claims 1.) Transfer material, marked by a pad .d a layer of paint, the layer of paint being a layer of paint from Type of full transfer is and from an imaging surface by adhesively press-contacting the transferred paint with an adhesive element without removing any Parts of the image surface can be removed. 2. transfer material according to claim 1, characterized in that that the color layer consists of a hard, film-forming, non-waxy resin, a pigment and a modifier for the resin. 3. Transfer material according to claim 2, characterized in that that the modifier from the group of mineral oils, mixed octyl esters of fatty acids, fatty acid esters, coconut oil and combinations of these is chosen. 4. Transfer material according to claim 3, characterized in that that the fatty acid esters are isopropyl palmitate and butyl stearate. 5. Transfer material according to claim 1, characterized in that there is a thin flexible base and one made of solvent has applied color layer for transfer to an imaging surface, wherein the color layer 20 to 55 wt -.% Of a hard non-waxy resin, 20 to 65 wt -.% Of a modifier for Sprödmachen and curing of the resin and / or for increasing the adhesion of the resin to the imaging surface, 5 to 30 wt -.% Of a color material from the group of pigments and organic dyes in the components of 409808/0787 7335838 The color layer is insoluble,
contains. 6. Transfer material according to claim 5, characterized in that that the resin is a polyamide. 7. Transfer material according to claim 5 *, characterized in that that the color material is carbon black. 8. Transfer material according to claim 5, characterized in that the modifying agent from the group of mineral oils, mixed octyl esters of fatty acids, isopropyl palmitate, butyl stearate and combinations of these is chosen. 9 »Typewriter tape with adhesive correction option, marked through a thin film backing and a layer of paint of the full transfer type, the color not being 25 to 35 % polyamide resin 15 to 30 % mineral oil 15 to 25 % mixed octyl esters of fatty acids and 25 to 35 % colorants from the group of pigments and those organic colorants that are insoluble in the other color components, contains. 10. Transfer material of the full transfer type for adhesive correction facility according to claim 1, characterized through a thin, flexible film backing and a layer of paint thereon, the layer of paint essentially also 409808/0787 ? 335838 the dry residue of a charging solution / dispersion with consists of a solvent mixture, this solution / dispersion 28 to 32 parts of a hard non-waxy film-forming resin, ^v 23 to 27 parts of mineral oil, 18 to 22 parts of a plasticizer based on mixed octyl esters of fatty acids, 28 to 32 parts of a pigment,
320 to 350 parts isopropanol and
80 to 90 parts of toluene
contains. 11. Transmission material according to claim 10, characterized in that that the resin is a polyamide and the pigment is carbon black. 12. A process for the production of a transfer material for adhesive correction possibility, characterized in that a thin, flexible base is coated with a solvent solution and dispersion of a hard film-forming non-waxy resin, a modification material for hardening and brittle the resin and colorant and that Solvent is removed from this solution and dispersion at a temperature of 38 to 6O ⁰ C (100 to 140 ^o F) in an atmosphere with a content of 0.006 to 0.009 kg of water per kg of dry air. 409808/0787 1j5. The method according to claim 12, characterized in that as Resin a polyamide, as a modification material at least one material from the group of mineral oils, mixed octyl esters of Fatty acids, fatty acid esters and coconut oil and, as a coloring material, a material from the group of pigments and dyes that are not soluble in the other components of the transfer material. 14. A method of manufacturing a transfer material for adhesive correction possibility, characterized in that a solution / dispersion of a hard non-waxy film-forming resin, a mineral oil, a plasticizer of the mixed octyl ester type of fatty acids and a pigment with a non-volatile content of 15 to 25 $ is prepared in a solvent mixture with a ratio of toluene to isopropanol of 1: 4, a thin flexible pad is coated with this solution / dispersion and the solvents are removed from this coating in an atmosphere, ctie e? L .. water content of 0.005 to 0.012 kg of water per kg dry air and a temperature of 38 to 6O ⁰ C comprises (up to 14O ° F 100). 15. The method according to claim 14, characterized in that oi ^ Resin a polyamide is used. 16. The method according to claim 14, characterized in that aer Water content is 0.006 to 0.009 kg of water per kg of dry air. 409608/0787