Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1996-09-04
1998-09-01
Edwards, Newton
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428394, 528 44, 528 55, 528 67, D02G 300, C08G 1800, C08G 1808, C08G 1870
Patent
active
058009205
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a polyurethane fiber and to a process for manufacturing such fibers. More particularly, the present invention concerns such a polyurethane fiber of fine decitex that has a combination of characteristics that make it particularly suited for use in highly durable pantyhose and other undergarments.
DESCRIPTION OF THE PRIOR ART
Polyurethane fibers are characterized by high elasticity and are widely used in numerous applications. Such fibers are known from, for example U.S. Pat. No. 3,184,426. Novel combinations of characteristics have been demanded of such fibers as the range of applications for the fibers has grown. For example, such combinations of characteristics have included high strength, high elongation, high elastic recovery, good heat setting, high mechanical and elastic durability, as well as resistance to degradation by mold and other environmental conditions. Such a combination of characteristics is particularly needed in fine (i.e., low decitex) polyurethane fibers that are intended to be incorporated into garments such as pantyhose, stockings, swimsuits, underwear, tights, etc.
Several well-known publications discuss the structures and properties of Properties and Molecular Structure!, published Mar. 10, 1973 in Special Edition 58 of Kagaku Dojinsha, pages 207 to 229, describes the known relationships between the structure and properties of polyurethaneureas, in which various diamines were used as chain extenders. However, the publication provides no specific examples that suggest a polyurethane fiber having the above-described combination desired characteristics, or how a particular polyurethane composition could result in a fiber with a specific structure and such a combination of characteristics. Also, there is no disclosure of the relationship between the structure and properties of polyurethanes made with diol chain extenders. 1988, pages 795 to 802, discloses an example in which a diol is used as a chain extender, but makes no reference to a polyurethane fiber that satisfies the aforementioned combination of desirable characteristics. Further, the present inventors know of no disclosures of a polyurethane fiber having the combination of characteristics desired for the fibers of the present invention. Although general methods have been disclosed for dry spinning solutions of diol-extended polyurethanes into filaments, the art provides no specific descriptions of conditions Under which a specific diol-extended polyurethane is dry spun under to provide the desired fibers of the present invention.
An object of the present invention is to provide a durable polyurethane fiber of fine decitex that has high strength, high elongation, good elastic recovery, low set, and good heat setting characteristics as well as good resistance to mold and other detrimental environmental agents and a method for manufacturing such fibers
SUMMARY OF THE INVENTION
The present invention provides a durable polyurethane fiber that exhibits in small angle X-ray scattering a scattering image that is different from those obtained with conventional polyurethane fibers. The polyurethane has a structural formula different diisocyanate residues, R.sup.2 is a dial residue, U is a urethane bond, and n.sub.1 and n.sub.2 are each the number of repeating units, the number being in the range of 1 to 10. The polyurethane fiber of the present invention is characterized in that period in the direction of the meridian of 7 to 16 nanometers, and period in the direction of the equator of 13 to 30 nm or an image of layer line dots.
The process for preparing the durable polyurethane fiber of the invention involves dry spinning a solution of polyurethane in an organic solvent, the polyurethane having a structural formula expressed by formula (I) above. The process is characterized in that the polyurethane has number of isocyanate groups based on diisocyanate and OH is the number of hydroxyl groups based on polyol (but not including the hydroxyl groups that are based on the diol c
REFERENCES:
patent: 3630657 (1971-12-01), Setzer
patent: 4106313 (1978-08-01), Boe
patent: 4837292 (1989-06-01), Lodoen
patent: 4871818 (1989-10-01), Lodoen
patent: 5000899 (1991-03-01), Dreibelbis et al.
patent: 5565270 (1996-10-01), Rehbold et al.
Nakanishi Hideki
Umezawa Masao
Watanabe Tsutomu
Dupont Toray
Edwards Newton
LandOfFree
Durable polyurethane fiber and method for the manufacture thereo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Durable polyurethane fiber and method for the manufacture thereo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Durable polyurethane fiber and method for the manufacture thereo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-268200