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    • 7. 发明授权
    • Phenol extended polyurethanes prepared by RIM process
    • 苯酚延长了通过RIM工艺制备的聚氨酯
    • US4314962A
    • 1982-02-09
    • US220749
    • 1980-12-29
    • John C. WollensakKryn G. Ihrman
    • John C. WollensakKryn G. Ihrman
    • B29C67/24C08G18/10C08G18/32C08G18/66B29F1/00
    • C08G18/6674B29C67/246C08G18/10C08G18/3215C08G2120/00
    • Polyurethanes can be produced using dihydroxyaromatic compounds as chain extenders. Preferred polyurethanes of this type are RIM (reaction injection molding) molded products or cast elastomers. The dihydroxyaromatic compounds are preferably selected from:I. dihydroxybenzenes and alkyl-substituted dihydroxybenzenes wherein the alkyl groups have up to about 6 carbon atoms and the total number of carbon atoms in the alkyl groups in said alkyl-substituted dihydroxybenzene is up to about 12 carbon atoms, andII. alkylene bridged, alkyl-substituted bisphenols wherein the alkylene bridge contains up to about 6 carbon atoms and the total number of carbon atoms in the alkyl groups attached to each benzenoid nucleus is at least one but does not exceed about 12;said dihydroxyaromatic compounds being further characterized by having no more than one tert-alkyl group on a position adjacent to any hydroxy group.
    • 可以使用二羟基芳族化合物作为扩链剂来生产聚氨酯。 这种类型的优选聚氨酯是RIM(反应注射成型)模制产品或铸塑弹性体。 二羟基芳族化合物优选选自:I.二羟基苯和烷基取代的二羟基苯,其中烷基具有高达约6个碳原子,并且所述烷基取代的二羟基苯中的烷基中的碳原子总数高达约12碳 原子和二。 亚烷基桥接的烷基取代的双酚,其中亚烷基桥含有至多约6个碳原子,并且连接到每个苯环的烷基中的总碳原子数为至少一个但不超过约12个; 所述二羟基芳族化合物的进一步特征在于在与任何羟基相邻的位置上不超过一个叔烷基。