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    • 70. 发明申请
    • Molded polyurethane body
    • 模压聚氨酯体
    • US20020004563A1
    • 2002-01-10
    • US09866298
    • 2001-05-25
    • Horst MuhlfeldThomas SchauberSilke Wagener
    • C08F283/00
    • C08G18/0895C08G18/7831C08G18/797C08G18/833
    • A molded polyurethane body is free of by-products capable of migrating and has high light fastness as well as improved temperature stability. The molded polyurethane body is obtainable by reacting: a) one or more aliphatic polyols having a molecular weight of 450 to 6000 g/mol and a hydroxyl value of 10 to 235; b) with aliphatic and/or cycloaliphatic diisocyanates in an equivalent ratio of diisocyanate to polyol of 1.2:1.0 to 16.0:1.0; c) with diols as chain lengthening agents having a molecular weight of 60 to 450 g/mol, the NCO index formed from the quotient, which is multiplied by 100, of the equivalent ratio of isocyanate groups to the sum of the hydroxyl groups of polyol and chain lengthening agents lying within a range of 90 to 105; and d) with an at least bifunctional reaction component, which is suitable for subsequent cross-linking and which reacts with the terminal hydroxyl groups of the polyurethane chain as well as with the acidic hydrogen atoms of the urethane groups and leads to branched-chain reactions, the thermoplastic polyurethane formed by conversion from the components a) through c) in a first step being homogenously mixed in a second step with 0.2 to 25 parts by weight of the component d) with respect to 100 parts by weight of the thermoplastic polyurethane, formed into a molded body, and subsequently cross-linked at temperatures from 80 to 240null C.
    • 模塑聚氨酯体不含能够迁移的副产物,并且具有高耐光性以及改善的温度稳定性。 模塑的聚氨酯体可通过以下反应获得:a)一种或多种分子量为450至6000g / mol且羟基值为10至235的脂族多元醇; b)与二异氰酸酯与多元醇的当量比为1.2:1.0至16.0:1.0的脂族和/或脂环族二异氰酸酯; c)用二醇作为分子量为60〜450g / mol的链延长剂,由商品形成的NCO指数乘以100,异氰酸酯基团的当量比与多元醇的羟基的总和相乘 和延伸剂在90至105的范围内; 和d)具有至少双功能的反应组分,其适用于随后的交联并且与聚氨酯链的末端羟基以及与氨基甲酸酯基团的酸性氢原子反应并导致支链反应 相对于100重量份的热塑性聚氨酯,在第一步骤中通过从组分a)至c)转化形成的热塑性聚氨酯在第二步中与0.2至25重量份的组分d)均匀混合, 形成成型体,然后在80-240℃的温度下交联。