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    • 26. 发明申请
    • Polyurethane Elastomers Based on TDI Prepolymers Enriched in the 2,6-TDI Isomer Cured with Trimethylene Glycol Di-(para Amino Benzoate)
    • 基于用三亚甲基二醇二(对氨基苯甲酸酯)固化的2,6-TDI异构体中富含的TDI预聚物的聚氨酯弹性体
    • US20140309397A1
    • 2014-10-16
    • US13860986
    • 2013-04-11
    • ANDERSON DEVELOPMENT COMPANY
    • ROBERT A. CZEISZPERGERJORDAN M. DUCKETTSTEPHEN D. SENEKER
    • C08G18/32
    • C08G18/4825C08G18/10C08G18/12C08G18/3206C08G18/4202C08G18/4238C08G18/4277C08G18/4804C08G18/4854C08G18/7621C08G2380/00C08G18/3243
    • Polyurethane/urea elastomer compositions which retain their dimensions at elevated temperatures. These polyurethane/urea elastomers surprisingly have improved green strength or dimensional stability upon demolding at typical mold temperatures of 80 to 130 C and remain dimensionally stable throughout the post cure process which is typically overnight at about 100 C. They are useful in indirect food contact or dry food contact applications since the compositions use trimethylene glycol di(p-aminobenzoate) as a chain extender or curative. The polyurethane/urea elastomers may be prepared by reacting toluene diisocyanate prepolymers with trimethylene glycol di(p-aminobenzoate). The toluene diisocyanate prepolymers are reaction products of toluene diisocyanate containing at least 25% by weight of the 2,6-isomer, preferentially at least 35%, more preferentially at least 45%, and most preferentially 60% with polyols such as polyoxyalkylene polyether polyols like polytetramethylene glycol, polypropylene glycol and polyethylene glycol, polyester polyols, polycaprolactone polyols, polycarbonate polyols, polybutadiene polyols or mixtures thereof.
    • 在高温下保持其尺寸的聚氨酯/脲弹性体组合物。 这些聚氨酯/脲弹性体令人惊奇地在80-130℃的典型模具温度下脱模时具有改善的生坯强度或尺寸稳定性,并且在整个后固化过程中保持尺寸稳定,其通常在约100℃过夜。它们可用于间接食品接触或 干食品接触应用,因为组合物使用三聚乙二醇二(对氨基苯甲酸酯)作为扩链剂或固化剂。 聚氨酯/尿素弹性体可以通过使甲苯二异氰酸酯预聚物与三亚甲基二醇二(对氨基苯甲酸酯)反应来制备。 甲苯二异氰酸酯预聚物是甲苯二异氰酸酯的反应产物,其含有至少25重量%的2,6-异构体,优选至少35重量%,更优选至少45重量%,最优选60重量%的多元醇,例如聚氧化烯聚醚多元醇 如聚四亚甲基二醇,聚丙二醇和聚乙二醇,聚酯多元醇,聚己内酯多元醇,聚碳酸酯多元醇,聚丁二烯多元醇或其混合物。