| 摘要 |
Ethylene glycol adipic acid polyester was modified by incorporating the naval stores derived 12-hydroxymethyitetrahydroabietanol in the polyester chain. The modified polyester was blended with a poly (ethylene adipate) glycol (mol. wt. 2000) and 1,4-butanediol, Bu(OH)2, giving glycol mixtures which were reacted with toluene diisocyanate TD1. Clear strong polyurethane films (26.6% TDI) from glycol mixtures (average hydroxyl equivalents, OHE, of 252) containing 5, 10, 15, and 20 percent resinyl moiety were prepared and their polymer properties examined. Incorporation of the moiety gave strength, toughness, and stiffness to films which otherwise would have been soft and tacky. Glycol mixtures having higher hydroxyl equivalent values required less isocyanate and addition of the resinyl glycol gave strong elastic films from a composition containing 16.6% TDI.
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