Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
  • B41N1/00—Printing plates or foils; Materials therefor
  • B41N1/04—Printing plates or foils; Materials therefor metallic
  • B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
  • B41N1/10—Printing plates or foils; Materials therefor metallic for lithographic printing multiple
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
  • C09D133/04—Homopolymers or copolymers of esters
  • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
  • C09D133/08—Homopolymers or copolymers of acrylic acid esters
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
  • C25D5/02—Electroplating of selected surface areas
  • C25D5/022—Electroplating of selected surface areas using masking means

Definitions

• the present invention relates in general to protective coatings and more particularly to resin-based protective coatings advantageously adapted for use in connection with coating operations requiring the deposition of metal upon metal.
• the feasibility of a given coating method will depend, inter alia, upon the type of metal serving a the base material, the type of coating to be deposited, the physical extent of the metallic film to be deposited, i.e., whether all or only certain pre-selected surfaces of the base material are to be coated. In those instances wherein the entire surface area of the metallic article is to be coated, i.e., wherein complete immersion of the metallic article in the plating bath is indicated, it is quite likely that any of the conventional coating techniques promulgated for such purposes is eminently applicable.
• the industrial applications are legion wherein metal on metal deposition is desirably effected upon only certain and pre-selected surfaces of the metallic article.
• the particular application may require that only certain discrete areas of a given metal surface be so coated as would be the case for example when providing ornamental or decorative designs.
• coating techniques which require immersing the entire metallic article in the plating medium, e.g., electroplating, would not be feasible in the absence of some manipulative technique designed to locally immunize such metallic article against the effects of the plating medium.
• a Wide variety of techniques have been evolved in the art by which such localized immersion can be accomplished.
• Paramount among the manipulative techniques thus far evolved in this regard are those based upon the use of protective coatings of a temporary nature, i.e., temporary in the sense of being unaffected by prolonged contact with the solution media employed in the coating operation but which are nevertheless easily removed by suitable postcoating treatment.
• such protective coating compositions contain as the essential ingredient a filmforming, polymeric resinous material, either natural or synthetic, capable of forming a strong, adhesive bond with the metal article being coated.
• a further source of difficulty stems from the fact that many of the resin materials currently employed for the aforedescribed purposes exhibit undesirable change in solubility characteristics as a result of prolonged immersion in the plating bath to the extent that complete removal of the protective resin coating from the metal surface is rendered extremely difficult.
• the latter phenomena often necessitates resort to mechanical, e.g. abrading as opposed to purely chemical, i.e., solubilization techniques to assure such removal.
• Such techniques are in most instances burdensome both from the standpoint of economics as well as ease of processing.
• Such printing plates comprise for example an aluminum base provided on one side with a surface coating of copper, chromium or the like, such surface coating serving as the support for a light-sensitive, resist-forming layer.
• An integral phase in the processing of such sensitized elements involves the etching out of the surface metal coating, this being accomplished pursuant to the provision of a final plate having grease-repellent and grease-receptive areas.
• the techniques heretofore provided for the preparation of such bimetallic base plates have left much to be desired.
• a primary object of the present invention resides in the provision of improved, resin-containing protective coatings admirably suited for use in connection with metal to metal coating operations and wherein. one or more of the surfaces of such metal is to be protected against the plating medium.
• Another object of the present invention resides in the provision of improved resin-containing protective coatings of a temporary nature advantageously adapted for use in connection with the preparation of bimetallic plates and wherein such resin is completely unaffected by the metal plating medium, e.g., the electrolytic plate bath; forms an adhesion bond of exceptional strength with the metal being coated; and is capable of being easily and completely removed from the metal surface subsequent to the plating operation.
• the metal plating medium e.g., the electrolytic plate bath
• thermoplastic, film-forming, acrylic resins which are soluble in alkaline media, i.e., a pH ranging from approximately 7.5 to 8.0, as the protective coating material in metal to metal coating techniques.
• the protective resin coating can be easily removed by treating same with an alkaline media, e.g., an ammonium hydroxide solution having a pH ranging from 7.5 to 8.0.
• an alkaline media e.g., an ammonium hydroxide solution having a pH ranging from 7.5 to 8.0.
• alkaline-soluble resin materials contemplated for use herein are derived from such monomers as acrylic acid, methacrylic acid, methyl methacrylate, etc., i.e., alpha, beta-ethylenically unsaturated carboxylic acids, their esters, hydrolysis products and their salts. Particularly beneficial results in terms of strength of adhesion as well as overall structural stability under the conditions employed for plating an aluminum sheet with copper, chromium, etc.
• the resin is applied in the form of an 0.5 to 1% solution in isopropyl alcohol, although other solvents such as methanol, ethanol, acetone, diacetone alcohol, methyl Cellosolve, dioxane, cyclohexanol, ethyl acetate, and the like may be used.
• solvents such as methanol, ethanol, acetone, diacetone alcohol, methyl Cellosolve, dioxane, cyclohexanol, ethyl acetate, and the like may be used.
• oleic acid and a surface-active agent such as Alkaterge A is advantageous in promoting uniform Wetting when the resin is applied to the metal surface.
• the protective resin coating compositions of the present invention may be advantageously employed in any metal to metal coating operation requiring complete immersion of the metal to be coated in the plating medium, they have particularly advantageous applicability to electroplating operations involving the deposition of copper or chromium upon aluminum.
• EXAMPLE I This example illustrates the application of the present invention to the production of a copper-coated aluminum plate.
• EXAMPLE H A resin pre-eoated aluminum sheet is prepared in the manner described in Example I. Copper plating of the coated aluminum surface is carried out with the following plating solution utilizing the parameters indicated:
• Copper fluoborate gms. 224 Fluoboric acid gms. 15 Boric acid gms. 15 Water to make liter 1 Cathode current density amps. per sq. ft. 35 Anode current density amps. per sq. ft. 30 Temperature, F.
• the pH of the above solution is approximately 1.4.
• the aluminum cathode is removed from the bath and given a Water rinse. Removal of the protective resin coating is accomplished in the manner described in Example I. Similar results are obtained in terms of ease of resin removal as well as resistance of the protective resin to the effects of the plating medium.
• the nature of the plating bath is likewise not a critical factorin the practice of the present invention, the sole requirement being that such bath be maintained under an acid pH and preferably below 6.5.
• the subject invention may be applied to production of metal surfaces containing ornamental or decorative designs thereon.
• the metal to be coated need not be planar but may be of arcuate or otherwise irregular configuration.
• the resin may be suitably applied by the use of a suitable stencil, pattern, etc.
• the procedure employed would be similar to that described in the above examples both as regards the electroplating operation and the protective resin removal operation.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Metallurgy (AREA)
• Electroplating Methods And Accessories (AREA)
• Manufacture Or Reproduction Of Printing Formes (AREA)

Priority Applications (7)

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Publications (1)

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Citations (3)

• 0
  • NL NL133909D patent/NL133909C/xx active
• 1966
  • 1966-04-18 US US543070A patent/US3390061A/en not_active Expired - Lifetime
  • 1966-07-05 US US562466A patent/US3451902A/en not_active Expired - Lifetime
• 1967
  • 1967-04-13 NL NL6705209A patent/NL6705209A/xx unknown
  • 1967-04-17 GB GB07588/67A patent/GB1172765A/en not_active Expired
  • 1967-04-17 DE DE1967G0049849 patent/DE1621081B1/de active Pending

Patent Citations (3)

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