ASTROTECH <AIX> DIRECTOR BUYS COMPANY STOCK Astrotech International Corp said its director S. Kent Rockwell, who controls Rockwell Venture Capital Inc, will buy 27 pct of the company's cumulative preferred stock. It said will buy up to 302,300 shares of Astrotech's 1.80 dlrs cumulative preferred stock. It said the shares are owned by W.F. Rockwell Jr, chairman and chief executive officer of Astrotech and S. Kent Rockwell's father.