He has been researching the polymer physics and supramolecular chemistry and now is focusing on polyrotaxane using cyclodextrin, necklace-like supramolecule with topological characteristics. He invented slide-ring materials with movable cross-links by cross-linking polyrotaxane in 2000, and set up a venture company to urge the application of the slide-ring materials in 2005. He has been the author of over 300 publications including original research papers, reviews, and books, and about 70 patents. He received The Award of the Society of Polymer Science, Japan (2006). And he is currently an editor of Polymer, Elsevir.