Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
  • B41M5/245—Electroerosion or spark recording

Definitions

• the invention relates to a method for producing a sliding layer on the surface of an aluminum layer on a support material provided on both sides with a lacquer layer.
• EP-A-36 469 which according to Art. 54 (3) and (4) EPC is deemed to be state of the art for DE, FR, GB and IT, a method was proposed for producing a sliding layer A 2 to 1000 nm thick layer of a metal soap from the group of stearates, palmitates, oleates, linoleates, resinates, laurates, naphthenates, tallates or mixtures thereof is applied to the surface of a recording medium coated with a thin aluminum layer. Soaps of the metals tin, zinc, lithium or magnesium are said to be particularly advantageous.
• the metal soaps according to EP-A-47 360 which also applies to the DE, FR, GB and IT according to Art. 54 (3) and (4) EPC, were dry, mechanical Application method applied and before mechanical application with 10 to 30 percent by weight, based on the sliding layer, of a polyfunctional aliphatic alcohol processed in a mortar or a mill to a homogeneous mass.
• EP-A-35 105 which according to Art. 54 (3) and (4) EPC applies to DE, FR, GB and IT as the state of the art, a method for at least partially converting an aluminum layer to aluminum salts Fatty acid proposed on a record carrier in which the aluminum is reacted with the vapor of a fatty acid during and / or after the vacuum deposition of the aluminum layer, the degree of conversion being determined by the partial pressure of the fatty acid.
• the use of oleic acid has been proposed, the reaction leading to the formation of aluminum oleate molecules which form on the surface of the layer and are also embedded within the layer itself.
• lacquer layers are nitro lacquer layers, the influence of which will be discussed further below.
• the resulting sliding layers are apparently due to the formation of an aluminum soap.
• the effectiveness of such a layer has been clearly demonstrated.
• this layer consists of an aluminum oleate could only be indirectly confirmed by the fact that the layer greatly reduces the abrasion marks that arise when printing with an electroerosion printer and that it is hydrophobic. If, on the other hand, you only apply a thin layer of oleic acid to an aluminum surface, this does not reduce the abrasion marks and the layer is not hydrophobic.
• oleic acid can only react with aluminum if there are aluminum radicals which can combine with the carboxyl groups of the fatty acid to form an aluminum soap.
• aluminum layer is evaporated on a base containing nitrocellulose.
• the nitrocellulose contains a nitrate grouping which apparently can activate the vapor-deposited aluminum.
• nitrocellulose has a high proportion of free -OH groups, which are activated by the electron-attracting action of the nitrate grouping and which could bring about the reaction with the oleic acid via an exchange reaction.
• nitrocellulose-containing paints are not particularly suitable for such recording media because of their easy flammability.
• other cellulose varnishes which, because of their varnishes containing nitrocellulose, are substantially higher in temperature stability this method would fail, such as acetyl cellulose or ethyl cellulose.
• the content of -OH groups in these celluloses is very much lower (approximately 1%) than that of nitrocellulose. Long-term tests with these materials at room temperature and also implementation tests at temperatures up to 100 ° C have led to very little success.
• a method for producing a sliding layer on the surface of an aluminum layer on a support material provided on both sides with a lacquer layer is proposed, at least one of the two lacquer layers being admixed with a fatty acid or a mixture of fatty acids and at least one of the two lacquer layers for reaction with fatty acids suitable radical generator is added.
• the procedure is preferably such that a metal azide Me (N 3 ) n is used as a metal radial former.
• a metal azide Me (N 3 ) n is used as a metal radial former.
• azides of aluminum, barium, potassium, calcium, lithium and sodium are to be used.
• a metal radical-forming metal azide is admixed to the top layer of the back coating and if a fatty acid or a mixture of fatty acids is admixed to the front coating.
• the proportion of the metal azide should be about 0.1 to 2% by weight of the liquid lacquer, while the proportion of the fatty acid or the mixture of fatty acids can be about 0.1 to 2% by weight of the liquid lacquer.
• Oleic acid has proven to be particularly suitable; very good results can also be achieved with a mixture of fatty acids, for example with tall oil or a mixture of oleic acid, stearic acid and palmitic acid in a ratio of about 3: 1: 1. _ _
• the metal azide is used with an excess in relation to the oleic acid.
• the nitrocellulose obviously favors the desired reaction, but on the other hand the acetylcellulose or the ethylcellulose are obviously not able to activate the aluminum layer for the reaction, the obviously required metal radicals must be formed from an additional compound, the anion of which is chemically unstable and disintegrates and leaves behind a metal radical.
• a metal azide Me (N 3 ) n ' which is mixed with the fatty acid in the back coat.
• the metal azide of the back coating i.e. are added to the top layer of the back coating while the fatty acid or mixture of fatty acids is added to the topcoat.
• Another possibility is to accommodate the metal azide and the fatty acid or the mixture of fatty acids in the back coating.
• it is also possible to accommodate the metal azide in the topcoat although difficulties still arise at present because the dreaded bakken could still occur with such an admixture.
• metal azide when used, metal radicals are formed which react accordingly with the fatty acid. This reaction intensifies at elevated temperatures. If both substances, ie the metal azide and the fatty acid are contained in the back coating, then a metal soap forms in the back coating, which diffuses through to the aluminum layer at an elevated temperature of approx. 70 ° C. An effective, highly hydrophobic soap layer can be detected there after only 12 hours. Finely ground NaN 3 was used for the individual experiments. This reaction continues until the supply of metal radicals is used up. By adding other azides, such as LiN 3 or Al (N 3 ) 3 . you get other soaps accordingly.
• one component for example the metal azide
• the other component e.g. the fatty acid
• the two components also diffuse towards one another and react primarily with one another on the aluminum layer.
• the sodium azide with grain sizes between 0.1 and 3 Ilm is analogous to one inorganic pigment finely dispersed in the paint.
• the stearic acid acts in such a way that it prevents the granular or crystalline sodium azide from forming lumps.
• a further essential aspect of the method according to the invention is seen in the fact that this is a reaction between solid substances and not, for example, a reaction between liquid and / or gaseous substances.
• this process is particularly suitable for paints made on the basis of acetyl cellulose.
• this in no way excludes their effectiveness in the case of nitrocellulose lacquers; on the contrary, the effect which already occurs there can be further improved by the process according to the invention.
• nothing is consumed by the already very thin aluminum layer, but the metal required to form a metal soap is obtained from an additional source.
• lithium azide LiN 3
• aluminum azide Al (N 3 ) 3 appears to be particularly interesting in this context.
• These azides can be dissolved in an organic solvent and can be mixed with the paint, which results in a very high degree of dispersion up to the real solution. Accordingly, the metal azide will be in solid solution in the paint.
• the decomposition temperature of both substances is relatively low, so that the reaction will take place at room temperature at a relatively high rate.

Landscapes

• Paints Or Removers (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Lubricants (AREA)
• Heat Sensitive Colour Forming Recording (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6115315

Family Applications (1)

Country Status (9)

Families Citing this family (3)

Family Cites Families (2)

• 1980
  • 1980-10-28 DE DE19803040513 patent/DE3040513A1/de not_active Withdrawn
• 1981
  • 1981-07-31 JP JP56119447A patent/JPS5783498A/ja active Pending
  • 1981-08-05 EP EP81106122A patent/EP0050716B1/de not_active Expired
  • 1981-08-05 DE DE8181106122T patent/DE3168776D1/de not_active Expired
  • 1981-09-01 CA CA000384980A patent/CA1180236A/en not_active Expired
  • 1981-09-21 US US06/304,279 patent/US4387119A/en not_active Expired - Fee Related
  • 1981-09-22 AU AU75566/81A patent/AU543869B2/en not_active Ceased
  • 1981-09-30 ZA ZA816774A patent/ZA816774B/xx unknown
  • 1981-10-20 ES ES506377A patent/ES506377A0/es active Granted
  • 1981-10-27 DK DK474381A patent/DK150710C/da not_active IP Right Cessation

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