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    TRANSITION METAL CHELATING POLYOL BLEND FOR USE IN A POLYURETHANE POLYMER
    11.
    发明申请
    TRANSITION METAL CHELATING POLYOL BLEND FOR USE IN A POLYURETHANE POLYMER 有权

    公开(公告)号：US20220275142A1

    公开(公告)日：2022-09-01

    申请号：US17626253

    申请日：2020-07-08

    Applicant: Dow Global Technologies LLC

    Inventor： Dakai Ren ,  William J. Harris ,  Brad C. Bailey

    IPC: C08G18/42 ,  C08G18/76 ,  C08G18/18 ,  C08J9/14

    Abstract: The present disclosure provides for a liquid transition metal chelating polyol blend that can be used in an isocyanate-reactive composition and a reaction mixture for forming a polyurethane polymer. The liquid transition metal chelating polyol blend includes a polyol, a transition metal compound having a transition metal ion and a chelating agent having a nitrogen based chelating moiety, where the liquid transition metal chelating polyol blend has a molar ratio of nitrogen in the nitrogen based chelating moiety to the transition metal ion of 8:1 to 1:1 (moles nitrogen:moles of transition metal ion).

    IMPROVED METHOD TO MAKE CARBON MOLECULAR SIEVE HOLLOW FIBER MEMBRANES
    15.
    发明申请
    IMPROVED METHOD TO MAKE CARBON MOLECULAR SIEVE HOLLOW FIBER MEMBRANES 审中-公开

    公开(公告)号：US20190275471A1

    公开(公告)日：2019-09-12

    申请号：US16333919

    申请日：2017-09-25

    Applicant: Dow Global Technologies LLC

    Inventor： Liren Xu ,  Rahul Sharma ,  William J. Harris ,  Mark K. Brayden ,  Marcos V. Martinez

    IPC: B01D67/00 ,  B01D53/22 ,  B01D69/02 ,  B01D69/08 ,  B01D71/02 ,  C08G73/10

    Abstract: An asymmetric hollow fiber (CMS) carbon molecular sieve is made by providing a dope solution comprised of a polvimide and a solvent, at a temperature greater than 250° C. that is less than the storage modulus at a temperature of 250° C., but no more than ten times less as measured using dynamic mechanical thermal analysis from 250° C. to a temperature where the polyimide carbonizes. The polvimide is shaped into a hollow polvimide fiber, the solvent removed and the polyimide hollow fiber is heated to pyroiyze the polvimide and form the asymmetric hollow carbon molecular sieve. The asymmetric hollow fiber carbon molecular sieve has a wall that is defined by an inner surface and outer surface of said fiber and the wall has an inner porous support region extending from the inner surface to an outer raicroporous separation region that extends from the inner porous support region to the outer surface. Surprisingly, when the polyimide has the particular storage modulus characteristics, the method allows for the hollow fiber CMS to be made without any pre-treatmenis or additives to inhibit stractural collapse of the inner microporous region.

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