Bicomponent fibers of isotactic and syndiotactic polypropylene

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

Reexamination Certificate

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C428S373000, C428S374000

Reexamination Certificate

active

06846561

ABSTRACT:
Bicomponent fibers of isotactic polypropylene and syndiotactic polypropylene, methods of making such fibers and products made thereof are disclosed. Embodiments of the bicomponent fibers can exhibit self-crimp properties and high shrinkage characteristics.

REFERENCES:
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patent: 3305538 (1967-02-01), Natta et al.
patent: 3364190 (1968-01-01), Emrick
patent: 4794096 (1988-12-01), Ewen
patent: 4795403 (1989-01-01), Heine et al.
patent: 4852851 (1989-08-01), Webster
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patent: 5225500 (1993-07-01), Elder et al.
patent: 5334677 (1994-08-01), Razavi
patent: 5476914 (1995-12-01), Ewen
patent: 6074590 (2000-06-01), Gownder
patent: 6395392 (2002-05-01), Gownder
patent: 05005261 (1933-01-01), None
Derwent No: 1993-055388 JP 05005261A Jan 27 1993.

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