TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Method: In the step of coating a composition on the source material, the composition is coated only on portions where the openings are not to be formed on one side of the source material, and is coated on the opposite side of the source material. The composition remaining on the patterned portion of the roller is transferred to the source material. The patterned portion has depressions in the surface of the roller to temporarily store the composition to be transferred to the source material. It has protrusions on the surface of the roller so that the composition adheres to the protrusions to the surface of the source material to be transferred to the source material. At least one roller is partially immersed in a composition storage unit to continuously supply the composition to the patterned portion. In the step of etching the source material to form openings, the side of the source material where the composition is coated by the roller having the patterned portion, is disposed to face downward, and an etchant is sprayed upward toward the source material. The collector is etched in a reel-to-reel process.Preferred Component: An ink supply roller is provided in contact with the pattern portion, for continuously supplying the composition to the patterned portion. A scraper is provided for removing the composition adhering to a portion other than the patterned portion, for clean printing is further provided at the main roller. A nozzle (64, 66) is provided for spraying an etchant upward toward the source material, and is provided under the source material having the patterns.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The composition includes an acid-resistant polymer which is a copolymerization product of a main chain forming monomer and an acid resistant acryl-based monomer and a water-resistant polymer which is a copolymerization product of a main chain forming monomer and a water-resistant acryl-based monomer, 1-20 pbw of a coloring agent, 5-50 pbw of a crosslinking agent, or 5-80 pbw of a solvent. The acid-resistant polymer and the water-resistant polymer are 1-90 pbw. The main chain forming monomer includes 5-75 pbw of aromatic vinyl monomer, and 20-55 pbw of alkyl (meth)acrylate. The acid-resistant acryl-based monomer is acrylic (meth)acrylate and the water-resistant acryl-based monomer is hydroxy alkyl(meth) acrylate. In the acid-resistant polymer, the content of the main chain forming monomer is 70-95 pbw and the acid-resistant acryl-based monomer is 5-30 pbw. In the water-resistant polymer, the content of the main chain forming monomer is 70-99 pbw and water-resistant acryl-based monomer is 1-30 pbw. The mixture ratio of the acid-resistant polymer to the water-resistant polymer is 1:4-4:1. EXAMPLE - 20 pbw of an acid-resistant polymer and 28 pbw of a water-resistant polymer were mixed, and 3 pbw aziridine, 8 pbw of a pigment, 0.3 pbw of aminomethyl propane, 1 pbw of wax and 38 pbw of a mixed solvent of water and ethanol were added and mixed for preparing a pattern forming composition for manufacturing a copper current collector. The surface of a source material for a copper current collector was degreased, the source material was passed between rollers, one of which had patterns shaped like openings formed on the current collector and the composition was coated on the collector. The resultant was dried at 120 degreesC and iron chloride was sprayed over surfaces of the collector, and etching was performed. The composition remaining on the collector was removed using a 4% sodium hydroxide aqueous solution for completing the collector having openings. The collector showed excellent resistance, peelability, printing adaptability, and water resistance.