Synthetic filaments and the like
AssigneeToray Industries, Inc.
InventorsMiyoshi Okamoto, Koji Watanabe, Yasuhiko Nukushina, Tsuneo Aizawa
Life of this patent
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Abstract
A synthetic filament and a yarn composed thereof wherein the filament comprises at least two different incompatible synthetic linear high polymers, one being distributed as islands in the sea of the other polymer element when seen in cross-section, each island being continuous along the axis of the filament and being characterized by their uniformity in cross-sectional dimension in any cross-section of the filament.
Claims88
A bundle of ultrafine filaments composed of a fiber-forming polymer which is characterized in that said bundle comprises at least 10 substantially parallel ultrafine filaments each of which is continuous along the longitudinal axes of said bundle and has a denier of less than 0.1.
A process for the production of a bundle of ultrafine filaments each having a denier of less than 0.1 composed of a fiber-forming polymer, which comprises discharging two molten fiber-formimg polymers having different compositions as at least one group, each said group consisting of at least 10 separate streams, each stream being in a sheath-and-core configuration wherein one polymer is covered by the other, combining said stream groups and spinning them together to form a continuous as-spun filament, and dissolving the sheath polymer of the filament with a solvent which dissolves the sheath polymer but not the core polymer.
In a yarn consisting of a plurality of composite filaments wherein each filament includes at least two different incompatible synthetic linear high polymers, and wherein one polymer functions as a matrix and said other polymer consists of a multiplicity of continuous ultrafine cores distributed substantially uniformly throughout the longitudinal body of the matrix, and wherein each core is characterized by its uniformity in a cross-sectional dimension, and the cross-sectional dimensions from core to core being of the same order of magnitude, the improvement wherein:
- a. said cores are substantially parallel to one another when said filament is viewed in longitudinal section;
- b. said cores are substantially rounded and substantially surrounded by other cores when viewed in transverse cross section;
- and
- c. each filament having a constant number of cores throughout its length wherein the number of said cores is at least 10 and not greater than 10,000.
Improved synthetic conjugate filaments wherein each filament comprises at least two different polymer elements, one of the polymer elements being, in longitudinal view, uniformly continuous as substantially parallel lines of many ultra-fine roundish filaments without branch, interbond and short fibril in the other polymer element, and being, in each cross section view, distributed substantially over the cross section as fine islands in the sea of said latter polymer elements without overlapped ribbon layers and convolution layers, characterized in that:
- (1) when seen in any cross-sectional view of the filaments,
- a. a number of islands are dotted uniformly all over the sea and in both the center and periphery parts of the filaments;
- b. the dotted islands of the inner part of the filaments are surrounded by the other islands of the outer part of the filament, and
- c. the number of the islands is within the range of from 10 to 10,000.
In a yarn consisting of a plurality of composite filaments wherein each filament includes at least two different incompatible synthetic linear high polymers, and wherein one polymer functions as matrix and said other polymer consists of a multiplicity of continuous ultra-fine cores distributed substantially uniformly throughout the longitudinal body of the matrix, and wherein each core is characterized by its uniformity in cross sectional dimension, and the cross sectional dimensions from core to core being of the same order of magnitude, the improvement wherein:
- a. said cores are substantially parallel to one another when said filament is viewed in longitudinal section;
- b. said cores are substantially rounded and substantially surrounded by other cores when viewed in transverse cross section;
- and
- c. each filament has a constant number of cores throughout its length wherein the number of said cores is at least ten and not greater than 10,000, and wherein a plurality of said cores are in contact with other cores and with said matrix.
A composite filament comprising at least two different incompatible synthetic linear high polymers, wherein one polymer functions as a matrix and said other polymer consists of a plurality of continuous ultra-fine cores distributed substantially uniformly throughout the longitudinal body of the matrix, and wherein each core is characterized by its uniformity in cross sectional dimension, and the cross sectional dimensions from core to core being of the same order of magnitude, the improvement wherein:
- a. said cores are substantially parallel to one another when said filament is viewed in longitudinal section;
- b. said filament having a constant number of cores throughout its length,
- c. and wherein some of said cores are in contact with other cores and wherein the remaining cores are completely adjacently surrounded by said matrix.
In a yarn consisting of a plurality of composite filaments wherein each filament includes at least two different incompatible synthetic linear high polymers, and wherein one polymer functions as a matrix and said other polymer consists of a multiplicity of continuous ultra fine cores distributed substantially uniformly throughout the longitudinal body of the matrix, and wherein each core is characterized by its uniformity in cross sectional dimension, and the cross sectional dimensions from core to core being of the same order of magnitude, the improvement wherein each of said filaments has the same number of cores.
In a yarn consisting of a plurality of composite filaments wherein each filament includes at least two different incompatible synthetic linear high polymers, and wherein one polymer functions as a matrix said other polyer consists of a multiplicity of continuous ultra fine cores distributed substantially uniformly throughout the longitudinal body of the matrix, and wherein each core is characterized by its uniformity in cross sectional dimension, and the cross sectional dimensions from core to core being of the same order of magnitude, the improvement wherein each said filament is free of irregularly shaped cores at the periphery of said filament.
In a yarn consisting of a plurality of composite filaments wherein each filament includes at least two different incompatible synthetic linear high polymers, and wherein one polymer functions as a matrix and said other polymer consists of a multiplicity of continuous ultra fine cores distributed substantially uniformly throughout the longitudinal body of the matrix, and wherein each core is characterized by its uniformity in cross sectional dimension, and the cross section dimensions from core to core being of the same order of magnitude, the improvement comprising distribution of said cores on a plurality of substantially concentric circles as seen in any transverse cross sectional view of said filament.
Dependencies are inferred from the claim text.