BUZZ-GrafTech International Ltd: Brookfield could invest $150 mln
** Graphite electrode maker's shares up 12.5 pct at $4.87
** Brookfield Asset Management Inc agrees to potential $150 mln investment through convertible preferred stock
** Brookfield could also launch a tender to buy GrafTech shares at $5.05 apiece, a 17 pct premium to Wednesday's close
** Tender to be effective if at least 15 pct of outstanding shares are tendered; and if over 75 pct shares are tendered, Brookfield to buy the rest in a merger deal for the same price
** Brookfield down 0.7 pct at C$65.72
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