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    • 9. 发明授权
    • Polysiloxane-polyoxyalkylene block copolymers with different
polyoxyalkylene blocks in the average molecule
    • 在平均分子中具有不同聚氧化烯嵌段的聚硅氧烷 - 聚氧化烯嵌段共聚物
    • US5306737A
    • 1994-04-26
    • US112504
    • 1993-08-26
    • Georg BurkhartRolf-Dieter LangenhagenAndreas WeierVolker Zellmer
    • Georg BurkhartRolf-Dieter LangenhagenAndreas WeierVolker Zellmer
    • C08G77/38C08G77/46C08G81/00C08G8/00
    • C08G77/46
    • Polysiloxane-polyoxyalkylene block copolymers having different polyoxyalkylene blocks in the average molecule are prepared. The mixture of the polyoxyalkylene blocks consists of at least one polyoxyalkylene group A and at least one polyoxyalkylene group B and/or at least one polyoxyalkylene group C, each polyoxyalkylene group A having an average molecular weight of 600 to 5,500 and consisting of 20 to 90% by weight of oxyethylene units and 80 to 10% by weight of oxypropylene units, polyoxyalkylene group B having an average molecular weight of 500 to 5,000 and consisting of 2 to 19% by weight of oxyethylene units and 98 to 81% by weight of oxypropylene units, polyoxyalkylene group C having an average molecular weight of 1,500 to 4,500 and consisting of oxypropylene units. Up to 20% by weight of the oxypropylene units is replaceable by oxybutylene units and the molar ratio of polyoxyalkylene groups A to the sum of the polyoxyalkylene groups B and C is 1:4 to 4:1. The block copolymers are highly effective stabilizers for the production of flexible polyurethane foams with an excellent ratio of cell fineness of the foam to air permeability of the foam.
    • 制备平均分子中具有不同聚氧化烯嵌段的聚硅氧烷 - 聚氧化烯嵌段共聚物。 聚氧化烯嵌段的混合物由至少一个聚氧化烯基团A和至少一个聚氧化烯基团B和/或至少一个聚氧化烯基团C组成,每个聚氧化烯基团A的平均分子量为600-5,500并且由20至90 重量%的氧化乙烯单元和80〜10重量%的氧化丙烯单元,聚氧化烯基B的平均分子量为500〜5000,由2〜19重量%的氧化乙烯单元和98〜81重量%的氧化丙烯 单元,平均分子量为1500〜4500的聚氧化烯基C,由氧化丙烯单元构成。 高达20重量%的氧化丙烯单元可以由氧丁烯单元替代,聚氧化烯基团A与聚氧化烯基团B和C之和的摩尔比为1:4至4:1。 嵌段共聚物是用于生产具有优异的泡沫细胞细度与泡沫的透气性的柔性聚氨酯泡沫塑料的高效稳定剂。