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    PROCESS FOR PREPARING INDIGO CARMINE
    3.
    发明申请
    PROCESS FOR PREPARING INDIGO CARMINE 审中-公开

    公开(公告)号：US20200283632A1

    公开(公告)日：2020-09-10

    申请号：US16884107

    申请日：2020-05-27

    Applicant: PROVEPHARM LIFE SOLUTIONS

    Inventor： Babak SAYAH ,  Stéphane QUERU ,  Michel FERAUD ,  Nicolas LOPEZ

    IPC: C09B7/02 ,  A23L5/47 ,  A61K47/22 ,  C09B67/54

    Abstract: Process for preparing disodium 5,5′-indigosulfonate, the feedstock being indigo, this process including the following steps: i) the indigo is subjected to a sulfonation treatment resulting in a mixture that contains 5,5′-indigosulfonic acid, this process including: ii) a reduction treatment is applied to the mixture obtained in step i), and optionally a purification step, so as to obtain a composition including leuco-5,5′-indigosulfonic acid, iii) the leuco-5,5′-indigosulfonic acid is isolated from the composition resulting from step ii), iv) the leuco-5,5′-indigosulfonic acid resulting from step iii) is oxidized to give disodium 5,5′-indigosulfonate.

    Dyed fibers and methods of dyeing using N,N′-diacetyl indigo
    4.
    发明授权
    Dyed fibers and methods of dyeing using N,N′-diacetyl indigo 有权

    公开(公告)号：US10655273B2

    公开(公告)日：2020-05-19

    申请号：US16023652

    申请日：2018-06-29

    Applicant: Stony Creek Colors, Inc.

    Inventor： Mark D. Keranen

    IPC: A61Q5/10 ,  D06P1/22 ,  C09B7/02 ,  D06P1/16

    Abstract: Described herein are methods of dyeing fibers, and dyed fibers and textiles made using the methods. The methods involve contacting a fiber with a dye liquor at a dye liquor temperature of about 30° C. to 115° C. to form a dyed fiber, wherein the dye liquor components include at least N,N′-diacetyl indigo and a salt solution having ionic strength of about 0.03 M (moles/liter) to 1 M and pH of about 3 to 8 at 20° C. The contacting is generally carried out for a contact period of about 10 seconds to 30 minutes, for example by immersing the fiber in the heated dye liquor. By using the disclosed methods, N,N′-diacetyl indigo is substantially uniformly distributed on the dyed fiber to provide intense, vibrant colors affixed thereto. Dyed textiles display substantially uniform color.

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