Method of dyeing hydrophobic textile fibers with colorant materials in supercritical fluid carbon dioxide
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United States of America Patent
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Apr 11, 2000
Issued Date -
N/A
app pub date -
Sep 29, 1998
filing date -
Jun 3, 1998
priority date (Note) -
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Abstract
Processes for dyeing a hydrophobic textile fiber with a colorant material using a SCF--CO.sub.2 dyebath are described. One process employs cooling, without venting or removing CO.sub.2 from the system, to a target CO.sub.2 temperature at or below the glass transition temperature of the hydrophobic fiber, followed by the venting of the dyeing system to atmospheric pressure. The other process employs venting, without cooling, to a target CO.sub.2 density where dye is no longer soluble in the SCF--CO.sub.2, followed by cooling to a target temperature and then venting to atmospheric pressure. Optionally, the temperature of the dyeing process is established by heating the process according to a selected temperature profile.
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