Water-disintegrable composite fiber and method of producing the same
AssigneeKureha Corporation
InventorKotaku Saigusa
Life of this patent
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Abstract
A water-disintegrable composite fiber comprising: a phase containing a polyglycolic acid resin; and a phase containing another resin having a mass loss of 25% or greater after immersion for 7 days in 80° C. pure water and having a glass transition temperature Tg of 25° C. or higher; the two phases extending continuously in the lengthwise direction; and the fiber having a side surface in which a region formed from the phase containing the polyglycolic acid resin is 50% or less in terms of area ratio, and a cross section in which a region formed from the phase containing the polyglycolic acid resin is 50% or greater in terms of area ratio.
Claims13
A water-disintegrable composite fiber comprising:
- a phase containing a polyglycolic acid resin;
- and a phase containing another resin having a mass loss of 25% or greater after immersion for 7 days in 80° C. pure water and having a glass transition temperature Tg of 25° C. or higher;
- the two phases extending continuously in the lengthwise direction;
- and
- the fiber having a side surface in which a region formed from the phase containing the polyglycolic acid resin is 50% or less in terms of area ratio, and a cross section in which a region formed from the phase containing the polyglycolic acid resin is 50% or greater in terms of area ratio.
A method of producing a water-disintegrable composite fiber, the method comprising the steps of:
- continuously discharging a polyglycolic acid resin and another resin, the other resin having a mass loss of 25% or greater after immersion for 7 days in 80° C. pure water and a glass transition temperature of 25° C. or higher, from a spinneret for composite fibers in a molten state so as to form a fibrous composite;
- and
- cooling the fibrous composite to obtain an undrawn yarn comprising a phase containing the polyglycolic acid resin and a phase containing the other resin, the undrawn yarn having a side surface in which a region formed from the phase containing the polyglycolic acid resin is 50% or less in terms of area ratio, and a cross section in which a region formed from the phase containing the polyglycolic acid resin is 50% or greater in terms of area ratio.
Dependencies are inferred from the claim text.