Process for disperse dyeing dry-spun atactic polyvinyl chloride-based filaments and fibres before drawing
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United States of America Patent
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Jul 21, 1987
Grant Date -
N/A
app pub date -
Mar 11, 1986
filing date -
Mar 26, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a process for continuous dyeing of filaments based on atactic polyvinyl chloride in the course of their production. The undrawn filaments are impregnated with a composition containing at least one plastosoluble dye while they have a density of between 1.3 and 1.4 g/cm.sup.3, are fixed continuously in the presence of steam under pressure at a temperature of between 100.degree. and 120.degree. C. for 2 to 20 seconds, are drawn in a known manner, are then fixed under tension in the presence of steam under pressure at a temperature of between 100.degree. and 130.degree. C. for 1 to 20 seconds, and are then oiled and shrunk in a known manner. Such a process permits quick dyeing, on an industrial scale, with good color fastness.
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