Polypropylene fibers and fabrics

US9322114B2 · kind B2 · utility

Assignees

• ExxonMobil Chemical Patents Inc. · US
• REIFENHÄUSER GMBH & CO. KG MASCHINENFABRIK · DE

Inventors

• Jeanne Marie MacDonald · Sugar Land, US
• Antonios K. Doufas · Houston, US
• Jerome Sarrazin · Kraainem, BE
• William M. Ferry · Houston, US
• Rahul R. Kulkarni · Houston, US
• Derek W. Thurman · Houston, US
• Cynthia A. Mitchell · Houston, US
• Detlef Frey · Niederkassel, DE
• Peter Schlag · Troisdorf, DE
• Hans-Georg Geus · Niederkassel, DE
• Claudio Cinquemani · Cologne, DE

Key dates

• Filing date: Dec 3, 2012
• Grant date: Apr 26, 2016
• Expiry date: Jul 19, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/696
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

This invention relates to polypropylene fibers and fabrics containing polypropylene fibers, the fibers comprising propylene polymers comprising at least 50 mol % propylene, said polymers having: a) a melt flow rate (MFR, ASTM 1238, 230° C., 2.16 kg) of about 10 dg/min to about 25 dg/min; b) a dimensionless Stress Ratio/Loss Tangent Index R2 [defined by Eq. (8)] at 190° C. from about 1.5 to about 30; c) an onset temperature of crystallization under flow, Tc,rheol, (as determined by SAOS rheology, 190° C., 1° C./min, where said polymer has 0 wt % nucleating agent present), of at least about 123° C.; d) an average meso run length determined by 13C NMR of at least about 55 or higher; and e) optionally, a loss tangent, tan δ, [defined by Eq. (2)] at an angular frequency of 0.1 rad/s at 190° C. from about 14 to about 70.