Polypropylene monofilament and tape fibers exhibiting...

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber

Reexamination Certificate

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C428S394000

Reexamination Certificate

active

06863976

ABSTRACT:
Unique thermoplastic (polypropylene, specifically) monofilament and/or tape fibers and yarns that exhibit heretofore unattained physical properties are provided. Such fibers are basically manufactured through the extrusion of thermoplastic resins that include a certain class of nucleating agent therein, and are able to be drawn at high ratios with such nucleating agents present, that the tenacity and modulus strength are much higher than other previously produced thermoplastic fibers (particularly those produced under commercial conditions), particularly those that also simultaneously exhibit extremely low shrinkage rates. Thus, such fibers require the presence of certain compounds that quickly and effectively provide rigidity to the target thermoplastic (for example, polypropylene), particularly after heat-setting. Generally, these compounds include any structure that nucleates polymer crystals within the target thermoplastic after exposure to sufficient heat to melt the initial pelletized polymer and allowing such an oriented polymer to cool. The compounds must nucleate polymer crystals at a higher temperature than the target thermoplastic without the nucleating agent during cooling. In such a manner, the “rigidifying” nucleator compounds provide nucleation sites for thermoplastic crystal growth. The preferred “rigidifying” compounds include dibenzylidene sorbitol based compounds, as well as less preferred compounds, such as [2.2.1]heptane-bicyclodicarboxylic acid, otherwise known as HPN-68, sodium benzoate, talc, certain sodium and lithium phosphate salts [such as sodium 2,2′-methylene-bis-(4,6-di-tert-butylphenyl)phosphate, otherwise known as NA-11]. Specific methods of manufacture of such inventive thermoplastic fibers, as well as fabric articles made therefrom, are also encompassed within this invention.

REFERENCES:
patent: 4016118 (1977-04-01), Hamada et al.
patent: 4116626 (1978-09-01), Varner
patent: 4132817 (1979-01-01), Tillotson
patent: 4171395 (1979-10-01), Tollotson
patent: 4463113 (1984-07-01), Nakahara et al.
patent: 4512831 (1985-04-01), Tillotson
patent: 4522857 (1985-06-01), Higgins
patent: 4560734 (1985-12-01), Fujishita et al.
patent: 5753736 (1988-05-01), Bhat
patent: 5049605 (1991-09-01), Rekers
patent: 5136520 (1992-08-01), Cox
patent: 5208592 (1993-05-01), Johnson, Jr.
patent: 5231126 (1993-07-01), Shi et al.
patent: 5342868 (1994-08-01), Kimura et al.
patent: 5512357 (1996-04-01), Shimura et al.
patent: 5540968 (1996-07-01), Higgins
patent: 5545276 (1996-08-01), Higgins
patent: 5798167 (1998-08-01), Connor et al.
patent: 5811045 (1998-09-01), Pike
patent: 5912292 (1999-06-01), Sun
patent: 5945211 (1999-08-01), Bersted et al.
patent: 5945215 (1999-08-01), Bersted et al.
patent: 5948500 (1999-09-01), Higgins
patent: 6102999 (2000-08-01), Cobb, III et al.
patent: 6110588 (2000-08-01), Perez et al.
patent: 6127440 (2000-10-01), Sanyasi et al
patent: 6127470 (2000-10-01), Cobb, III et al.
patent: 6135987 (2000-10-01), Tsai et al.
patent: 6162887 (2000-12-01), Yamada et al.
patent: 6203881 (2001-03-01), Higgins
patent: 6207600 (2001-03-01), Nakajima et al.
patent: 6210802 (2001-04-01), Risch et al.
patent: 6218011 (2001-04-01), Raetzsch et al.
patent: 6231976 (2001-05-01), Dean et al.
patent: 6238615 (2001-05-01), Kobayashi et al.
patent: 6261677 (2001-07-01), Tsai et al.
patent: 6284370 (2001-07-01), Fujimoto et al.
patent: 6270608 (2001-08-01), Vair, Jr. et al.
patent: 6300415 (2001-10-01), Okayama et al.
patent: 6358450 (2002-03-01), Sun
patent: 6420024 (2002-07-01), Perez et al.
patent: 6468623 (2002-11-01), Higgins
patent: 6534574 (2003-03-01), Zhao et al.
patent: 6541554 (2003-04-01), Morin et al.
patent: 6559211 (2003-05-01), Zhao et al.
patent: 6559216 (2003-05-01), Zhao et al.
patent: 6656404 (2003-12-01), Morin
patent: 20010040320 (2001-11-01), Kobayashi et al.
patent: 20010048179 (2001-12-01), Stewart et al.
patent: 20020002241 (2002-01-01), Raetzsch et al.
patent: 0 611 271 (1994-10-01), None
patent: 0 806 237 (1997-07-01), None
patent: 11061554 (1999-03-01), None
patent: 11140719 (1999-05-01), None
patent: 2002-302825 (2001-04-01), None
patent: 0246502 (2002-06-01), None
Patent abstracts of Japan; publication number 11-061554; date of publication of application Mar. 5, 1999; Highly heat-resistant polypropytene fiber; English translation.
Patent abstracts of Japan; publication number 11-181619; date of publication of application Jul. 8, 1999; Highly heat-resistant polypropylene fiber and fiber-reinforced cement molded product using the same; English translation.
Patent abstracts of Japan; publication number 2001-081628; date of publication Mar. 27, 2001; Flat yarn for base cloth of needle-punched carpet; English translation.
Patent abstracts of Japan; publication number 2002-302825; date of publication Oct. 18, 2002; Highly-resistant polypropylene fibers; English translation.
Article; Journal of applied polymer science, vol. 62, 1965-1975 (1996) John Wiley & Sons, Inc.; Spruiedll et al.
Article; The effects of pigments on the development of structure and properties of polypropylene filaments; Antec '91: Lin et al.
Article; The role of crystallization kinetics in the development of the structure and properties of polypropylene filaments; © 1993 John Wiley & Sons, Inc.; CCC 0021-8995/93/040623-9.
Article; Study on the formation of b-crystalline from isotactic polypropylene fiber; fiber and films, Intern. Polymer Processing VI, 1991: Chen et al.
Article; Heterogeneous Nucleation of Polypropylene and Polypropylene Fibers; Marcincin et al.; 1994.

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