Styrene → Styrene

Participants

Reaction Steps

A hydroxyl polyester having an acid number of 0.3 and a hydroxy number of 48.1 was prepared from 714 g (11.5 moles) of ethylene glycol and 1460 g (10 moles) of adipic acid in the conventional manner. 400 ppm of hydroquinone were added to this polyester to obtain a 50% styrene solution of the polyester. 4676 g (2 equivalents) of this solution were allowed to react with 248 g (2.85 equivalents) of tolylene diisocyanate and 116 g (1 mole) of hydroxylethyl acrylate at 65° C. or less for two hours. To the resulting reaction product were added dropwise over 1.5 hours 364 g of styrene and 2.7 g of dibutyltin dilaurate. The reaction was allowed to continue at 70° C. for further two hours until no NCO remained in the reaction system, thereby to obtain a 50% styrene solution of an unsaturated acrylic urethane (hereinafter called Acrylic Urethane I). The urethane was found to have a weight-average extension of molecular chain of 600 A.

Provenance & Evidence