Isophorone diisocyanate → Urethane acrylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Air was fed to a 2 L three-necked flask equipped with a stirrer, a thermometer, a condenser, and an air inlet tube, and then polytetramethylene glycol (trade name: PTG850SN, product of Hodogaya Chemical Co., Ltd.) (520.8 g), diethylene glycol (1.06 g), unsaturated fatty acid hydroxyalkyl ester-modified ε-caprolactone (trade name: FA2D, product of Daicel Chemical Industries, Ltd.) (275.2 g), p-methoxyquinone (0.5 g) serving as a polymerization inhibitor, and dibutyltin dilaurate (trade name: L101, product of Tokyo Fine Chemical Co., Ltd.) (0.3 g) serving as a catalyst were added to the flask and heated to 70° C. Thereafter, isophorone diisocyanate (trade name: Desmodur I, product of Sumika Bayer Urethane Co., Ltd.) (222 g) was uniformly added dropwise to the flask over two hours under stirring at 70 to 75° C., to thereby allow reaction to proceed. After completion of dropwise addition, reaction was allowed to proceed for about five hours and then stopped. The weight average molecular weight of the resultant product (as reduced to standard polystyrene) was determined by means of GPC(SD-8022/DP-8020/RI-8020, product of Tosoh Corporation). Thus, urethane acrylate A having a weight average molecular weight of 10,000 was produced.

Herkunft & Nachweise