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    Method to make carbon molecular sieve hollow fiber membranes
    33.
    发明授权
    Method to make carbon molecular sieve hollow fiber membranes 有权

    公开(公告)号：US11167248B2

    公开(公告)日：2021-11-09

    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 ,  B01D71/64

    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.

    Amide Combinations for Cleaning and Stripping of Electronic Parts
    34.
    发明申请
    Amide Combinations for Cleaning and Stripping of Electronic Parts 审中-公开

    公开(公告)号：US20200150542A1

    公开(公告)日：2020-05-14

    申请号：US16628598

    申请日：2017-07-06

    Applicant: Dow Global Technologies LLC

    Inventor： Qi Jiang ,  Xin Jiang ,  Hua Ren ,  Eungkyu Kim ,  Jianhai Mu ,  Kaoru Ohba ,  William J. Harris

    IPC: G03F7/42 ,  C11D7/32

    Abstract: A solvent consisting essentially of: (A) a first component consisting of N,N-diethylacetamide (DEAC); (B) a second component consisting of 3-methoxy-N, N-dimethyl propionamide (M3DMPA); and (C) an optional third component consisting of one or more glycol ethers or glycol ether acetates; or a solvent consisting essentially of: (1) a first component consisting of one or more acyclic amides of Formula (I): and (2) an optional second component consisting of one or more of DEAC, M3DMPA, N,N-dimethylpropionamide, one or more glycol ethers or glycol ether acetates, and one or more cyclic amides of Formulae (II-IV).

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