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    PROCESS FOR FORMING POLYLACTIDE EXPANDED BEAD FOAM
    1.
    发明申请
    PROCESS FOR FORMING POLYLACTIDE EXPANDED BEAD FOAM 有权

    公开(公告)号：US20210292510A1

    公开(公告)日：2021-09-23

    申请号：US17266195

    申请日：2019-08-21

    申请人： NatureWorks LLC

    发明人： Nemat Hossieny ,  Manuel A.W. Natal

    IPC分类号： C08J9/232 ,  C08J9/12 ,  C08J9/00

    摘要： Expanded poly(lactide) (PLA) beads are made by pressurizing PLA beads with carbon dioxide at approximately room temperature, heating the beads under pressure to 90 to 160 C to saturate and partially crystallize the beads, and then depressurizing and cooling the beads. The PLA beads contain a blend of PLLA and PDLA in certain ratios. The beads are useful for making expanded bead foam.

    RECOVERY OF LACTIC ACID VALUES FROM A MESO-LACTIDE STREAM
    7.
    发明申请
    RECOVERY OF LACTIC ACID VALUES FROM A MESO-LACTIDE STREAM 有权
    从MESO-LACTIDE STREAM恢复酸度值

    公开(公告)号：US20140031566A1

    公开(公告)日：2014-01-30

    申请号：US14040530

    申请日：2013-09-27

    申请人： NATUREWORKS LLC

    发明人： Richard Douglas Benson ,  Joseph D. Schroeder

    IPC分类号： C07D319/12

    CPC分类号： C07D319/12

    摘要： Lactic acid equivalents are recovered from a starting lactide stream by catalytically racemizing a portion of the lactide in the stream at a temperature of 180° C. or below. This increases the proportion of two species of lactide (i.e., at least two of S,S-, R,R- or meso-lactide) at the expense of the third species. The racemized mixture so obtained can be separated to recover some or all of one or more of the lactide species from the remaining lactide species, by a process such as melt crystallization or distillation. Impurities in the starting lactide stream usually are retained mostly in the remaining meso-lactide, so a highly purified S,S- and/or R,R-lactide stream can be produced in this manner. Such a purified S,S- and R,R-lactide stream is suitable for polymerization to form a polylactide.

    摘要翻译： 通过在180℃或更低的温度下在流中将一部分丙交酯催化外消旋化，从起始丙交酯流中回收乳酸当量。 这增加了两种种类的丙交酯（即S，S-，R，R-或内消旋丙交酯中的至少两种）的比例，牺牲了第三种物质。 如此获得的外消旋化混合物可以被分离，以通过诸如熔融结晶或蒸馏的方法从剩余的丙交酯物质中回收一种或多种一种或多种丙交酯物质。 起始丙交酯流中的杂质通常保留在剩余的内消旋丙交酯中，因此可以以这种方式制备高纯度的S，S-和/或R，R-丙交酯流。 这种纯化的S，S-和R，R-丙交酯流适用于聚合以形成聚丙交酯。