English Abstract

Science and Technology of Polyurethanes was the Polyurethane Understood in How Far?
III Progress of raw materials for polyurethanes

Mutsuhisa FURUKAWA
The Emeritus Professor of Nagasaki University, Institute of Nagasaki Polyurethane Science and Technology, Chuo-ku, Fukuoka, Japan
Nippon Gomu Kyokaishi,(2018),91(11),406-414 General Review in Japanese

Polyurethanes are synthesized by reaction of polymer glycols, diisocyanates and active hydrogen compounds as chain extenders (curing agents). Chain extenders are low molecular glycol and diamine. Elucidation of the reaction mechanism of isocyanate with active hydrogen compound is indispensable to expand the dream to create new polyurethane. Recent advances in computer chemistry has greatly contributed to understand the reaction mechanism of active hydrogen-containing compound and isocyanate. This article, at first, reviewed the progress of the reaction mechanism of isocyanate, and then described the features of the new diisocyanates, polyol, curing agent, and catalyst.

Keywords: Reaction Mechanism of NCO, Polymer Glycols, Disocyanates, Chain Extenders, Crosslinking Agents, Catalysts