Lyocell fibers and methods of producing the same
AssigneeAalto University Foundation sr
InventorsSimone Haslinger, Yingfeng Wang, Eugenia Smirnova, Michael Hummel, Herbert Sixta, Marja Rissanen
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Abstract
Colored lyocell type fibers comprising respun coloured recycled fibers and method of producing the same. According to the method a raw-material of colored recycled textile fibers is provided and dissolved in an ionic liquid to provide a spinning dope. By spinning the dope using dry jet-wet spinning colored respun textile fibers can be manufactured. The invention provides for the simultaneous recycling of cellulose fibers and dyes from dyed cotton waste in the form of dyed lyocell fibers.
Claims13
A method of recycling of dyes used for dyeing of cellulosic fibers, said method comprising:
- dissolving cellulosic fibers containing a dye into a superbase-based ionic liquid capable of dissolving the cellulosic fibers and the dye to form a spinning dope, wherein the superbase-based ionic liquid comprises [MTBDH][OAc], and
- using the dope to make colored fibers by spinning, the colored fibers having a color corresponding to a color of the cellulosic fibers.
Dependencies are inferred from the claim text.