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    Method for producing lactic acid based polyurethane
    49.
    发明授权
    Method for producing lactic acid based polyurethane 失效
    生产乳酸基聚氨酯的方法

    公开(公告)号：US5380813A

    公开(公告)日：1995-01-10

    申请号：US138539

    申请日：1993-10-15

    申请人： Jukka Seppala ,  Johan-Fredrik Selin ,  Tao Su

    发明人： Jukka Seppala ,  Johan-Fredrik Selin ,  Tao Su

    IPC分类号： A01G9/02 ,  A01G9/14 ,  B65D1/00 ,  C05G3/00 ,  C08G18/42 ,  C08G63/06 ,  C08L101/16 ,  C08G18/06

    CPC分类号： C08G18/4283 ,  C08G2230/00 ,  C08G2310/00

    摘要： The present invention relates to a production method of lactic acid-based polyurethanes. In the first phase of the product ion, the monomeric lactic acid is polymerized into an oligomer, the molecular weight thereof being about 500 to 10,000. Next, the oligomer thus obtained is copolymerized with an isocyanate reacting with the free hydroxyl and carboxyl groups thereof into polyurethane with a high molecular weight. To make the oligomer react with diol prior to the copolymerization is unnecessary according to the invention. The lactic acid used need not be absolutely pure, and by modifying the process, various biodegradable end products can be obtained therefrom, which according to the invention are appropriate for the material of disposable packages, agricultural film or planting pots, or as a coating of fertilizer granules.

    摘要翻译： 本发明涉及乳酸类聚氨酯的制造方法。 在产物离子的第一相中，将单体乳酸聚合成低聚物，其分子量为约500至10,000。 接着，将由此获得的低聚物与其游离羟基和羧基反应的异氰酸酯与高分子量的聚氨酯共聚。 为了使低聚物在共聚前与二醇反应，根据本发明是不必要的。 使用的乳酸不必是绝对纯的，通过改变方法，可以从其获得各种可生物降解的终产物，根据本发明，其可适用于一次性包装材料，农用膜或种植盆，或作为 肥料颗粒。