DAINIPPON INK TO INVEST IN QUIXOTE <QUIX> Quixote Corp said Dainippon Ink and Chemicals Inc of Japan will buy 526,315 shares of Quixote common stock, a 6.7 pct stake, for 10 mln dlrs, or 19 dlrs a share. It said the two companies also agreed to share the results of their research and development activities in optical disc technology. Dainippon Inc's optical disc technology focuses on the development of a new Direct-Read-After-Write optical disc and an advanced erasable optical disc. Quixote said its wholly owned subsidiary, LaserVideo Inc, is making advancements in the art of mastering and manufacturing Compact Discs, CD-ROMs and laser-read videodiscs. Quixote said the agreement with Dainippon, which has annual sales of more than two billion dlrs, provides for a Dainippon representative to sit on the LaserVideo board of directors.