Monofilament yarn and process for producing the same
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsYasunori Yuuki, Teruhiko Matsuo, Tadashi Koyanagi
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Abstract
The present invention provides a polytrimethylene terephthalate monofilament yarn excellent in softness, bending recovery or durability against a long term use. The inventive polytrimethylene terephthalate monofilament yarn is constituted by trimethylene terephthalate composed of 90 mol % or more of trymethylene terephthalate repeating units and 10 mol % or less of other ester repeating units, wherein the yarn has a single-fiber size of 50 dtex or more, an intrinsic viscosity in a range from 0.8 to 1.3 dl/g, and a boiling water shrinkage of 2% or less.
Claims7
A polytrimethylene terephthalate monofilament yarn constituted by PTT composed of 90 mol % or more of trimethylene terephthalate repeating units and 10 mol % or less of other ester repeating units, wherein the yarn has a single-fiber size of 50 dtex or more, an intrinsic viscosity in a range from 0.8 to 1.3 dl/g, and a boiling water shrinkage of 2% or less.
A method for producing a polytrimethylene terephthalate monofilament yarn, wherein after a raw material polytrimethylene terephthalate monofilament yarn having a fiber size of 50 dtex or more is spun and drawn, the raw material polytrimethylene terephthalate monofilament yarn is subjected to a relaxation heat treatment under the condition of a relaxation ratio in a range from −10 to +15% and a heat treatment temperature in a range from 100 to 180° C.
Dependencies are inferred from the claim text.