| abstract |
PURPOSE: To obtain the title elastomer excellent in light resistance, balance among physical properties, etc., by reacting the major component comprising a specific polyurethane prepolymer with a specific polyetheramine and a specific crosslinker. n CONSTITUTION: The major component comprising an isocyanate-terminated polyurethane prepolymer obtd. by reacting an alicyclic-aliph. diisocyanate of formula I (wherein m and n are each 1-5) with a polyhydroxyl compd. (e.g. a polytetramethylene ether glycol) is reacted with a polyetheramine having primary and/or secondary amino groups at the molecular terminals (e.g. Jeffamine D 2000, a product of Texaco Chemical Co., Ltd.) and a crosslinker comprising an alicyclic-aliph. diamine of formula II. n COPYRIGHT: (C)1992,JPO&Japio |