| 摘要 |
A ROLLED COPPER FOIL FOR FLEXIBLE PRINTED CIRCUITS COMPRISING, ALL BY WEIGHT,FROM 0.0100 TO 0.0400% OF AG, FROM 0.0100 TO 0.0500% OF OXYGEN, NOT MORETHAN 0.0030IN TOTAL OF ONE OR MORE ELEMENTS SELECTED FROM THE GROUPCONSISTING OF S, AS, SB, BI, SE, TE, PB, AND SN, AND Sn THE BALANCE COPPER, THEFOIL HAVING A THICKNESS IN THE RANGE OF 5 TO 50 µM, A HALF-SOFTENING TEMPERATURE OF 120 TO 150° C., BEING CAPABLE OF RETAINING A TENSILE STRENGTH OF AT LEAST 300 N/MM2 AT 30° C., AND POSSESSING EXCELLENT FLEX FATIGUE PROPERTY AND ADEQUATE SOFTENING PROPERTY. THE INTENSITY (I) OF THE (200) PLANE DETERMINED BY X-RAY DIFFRACTION OF THE ROLLED SURFACE AFTER ANNEALING AT 200° C. FOR 30 MINUTES IS 1/1o>20 WITH RESPECT TO THE X-RAY DIFFRACTION INTENSITY (1o) OF THE (200) PLANE OF FINE COPPER POWDER. A METHOD OF MANUFACTURING THE ROLLED COPPER FOIL BY A PROCESS WHICH COMPRISES HOT ROLLING AN INGOT, REPEATING COLD ROLLING AND ANNEALING ALTERNATELY, AND FINALLY COLD ROLLING THE WORK TO A FOIL, THE ANNEALINGIMMEDIATELY PRECEDING THE FINAL COLD ROLLING BEING PERFORMED UNDER CONDITIONS THAT ENABLE THE ANNEALED RECRYSTALLIZED GRAINS TO HAVE A MEAN GRAIN DIAMETER OF NOT GREATER THAN 20 mM, THE REDUCTION RATIO OF THE FINAL COLD ROLLING BEING BEYOND 90.0%, WHEREBY EXCELLENT FLEX FATIGUE PROPERTY AND ADEQUATE SOFTENING PROPERTY ARE ACHIEVED.
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