Title:
BICOMPONENT FIBERS AND METHODS FOR MAKING THEM
Document Type and Number:
WIPO Patent Application WO/2012/064469
Kind Code:
A8
Abstract:
The present invention relates to bicomponent polymer fibers, and to processes for forming those fibers. Bicomponent polymer fibers are described, having a core comprising a core polymer and a sheath comprising a sheath polymer, wherein the sheath polymer is a polyolefm having an Mw less than about 65,000 g/mol. The core polymer has an Mw at least about 20,000 g/mol greater than the Mw of the sheath polymer. Processes for forming bicomponent fibers are also described, comprising (i) forming a molten blend of a core polymer and a sheath polymer; (ii) extruding the molten polymer blend using an extrusion die having a length to diameter ratio greater than or equal to about 10 and under shear conditions sufficient to drive the sheath polymer to the die wall; and (iii) forming meltblown fibers having a core comprising the core polymer and a sheath comprising the sheath polymer.
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Inventors:
RICHESON GALEN C (US)
WESTWOOD ALISTAIR D (US)
MEHTA ASPY K (US)
WESTWOOD ALISTAIR D (US)
MEHTA ASPY K (US)
Application Number:
PCT/US2011/056736
Publication Date:
September 20, 2012
Filing Date:
October 18, 2011
Export Citation:
Assignee:
EXXONMOBIL CHEM PATENTS INC (US)
RICHESON GALEN C (US)
WESTWOOD ALISTAIR D (US)
MEHTA ASPY K (US)
RICHESON GALEN C (US)
WESTWOOD ALISTAIR D (US)
MEHTA ASPY K (US)
International Classes:
D01D5/06; D01F6/46; D01F8/06
Attorney, Agent or Firm:
ARECHEDERRA, Leandro, III (P.O. Box 2149Baytown, TX, US)
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