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    Hyperbranched polylactide resin compositions
    1.
    发明授权
    Hyperbranched polylactide resin compositions 有权

    公开(公告)号：US11566103B2

    公开(公告)日：2023-01-31

    申请号：US16960035

    申请日：2019-01-25

    申请人： NatureWorks LLC

    发明人： Jed Richard Randall ,  Aman Kulshrestha ,  Nemat Hossieny

    IPC分类号： C08G63/82

    摘要： Polylactide resins are branched by reaction with a mixture of a polyene compound and a cyclic peroxide. This branching method produces a product that has a very high polydispersity, a high branching number (Bn) and excellent melt strength, without forming large amounts of gelled material. The branched polylactide resins are useful in many melt processing operations, in particular sheet and film extrusion, extrusion foaming, extrusion coating and fiber processing. They are characterized by easy processing and allow for broadened processing windows.

    PROCESS FOR FORMING POLYLACTIDE EXPANDED BEAD FOAM
    6.
    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.

    METHOD TO PRODUCE SEMI-CRYSTALLINE POLYLACTIDES
    8.
    发明申请
    METHOD TO PRODUCE SEMI-CRYSTALLINE POLYLACTIDES 有权
    生产半结晶聚乙烯的方法

    公开(公告)号：US20150087799A1

    公开(公告)日：2015-03-26

    申请号：US14343912

    申请日：2012-09-11

    申请人： Hisanori Kishida ,  Takashi Hasegawa ,  Nobuyoshi Nomura ,  Makoto Takahashi ,  Joseph Schroeder ,  Manuel Natal

    发明人： Hisanori Kishida ,  Takashi Hasegawa ,  Nobuyoshi Nomura ,  Makoto Takahashi ,  Joseph Schroeder ,  Manuel Natal

    IPC分类号： C08G63/08

    CPC分类号： C08G63/08 ,  C08G63/823

    摘要： This invention provides a method for synthesizing semi-crystalline polylactides (PLA) even from a lactide mixture including meso-LA and rac-LA. According to the invention, when a mixture of racemic lactide and meso-lactide ispolymerized using a catalyst capable of iso-selectively polymerizing L-lactide and D-lactide, an amorphous poly (meso-lactide) block is formed from meso-lactide and a semi-crystalline poly (racemic lactide) block is formed from racemic lactide by separately polymerizing racemic lactide and meso-lactide by taking advantage of a difference in physicochemical properties between racemic lactide and meso-lactide, whereby polylactide which is semi-crystalline as a whole is produced.

    摘要翻译： 本发明提供了即使由包括meso-LA和rac-LA的丙交酯混合物合成半结晶聚交酯（PLA）的方法。 根据本发明，当外消旋丙交酯和内消旋丙交酯的混合物使用能够同时选择性聚合L-丙交酯和D-丙交酯的催化剂进行聚合时，由内消旋丙交酯形成无定形的聚（内消旋丙交酯）嵌段， 通过利用外消旋丙交酯和内消旋丙交酯之间的物理化学性质的差异，通过分别外消旋丙交酯和内消旋丙交酯聚合形成半结晶聚（外消旋丙交酯）嵌段，由此作为整体是半结晶的聚丙交酯 生产。

    Recovery of lactic acid values from a meso-lactide stream
    9.
    发明授权
    Recovery of lactic acid values from a meso-lactide stream 有权

    公开(公告)号：US08552209B2

    公开(公告)日：2013-10-08

    申请号：US13203075

    申请日：2010-03-12

    申请人： Richard Douglas Benson ,  Joseph D. Schroeder

    发明人： Richard Douglas Benson ,  Joseph D. Schroeder

    IPC分类号： C07D319/00

    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.