The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2001
Filed:
Nov. 05, 1998
Mohan Gownder, Odessa, TX (US);
Baireddy Raghava Reddy, Edmond, OK (US);
Jay Nguyen, Pasadena, TX (US);
Fina Technology, Inc., Houston, TX (US);
Abstract
A polymer blend, fibers manufactured from the blend and method of producing the fibers is disclosed. The polymer blend includes from 92 wt % to 98.5 wt % of a base polypropylene having a melt flow rate of less than 20 g/10 min, and a maximum draw ratio D, a Crimp Stability of CS, when drawn into filaments at 1000 m/sec, and from 8 wt % to 1.5 wt % of an amorphous polystyrene having a melt flow rate of less than 15 g/10 min. The polymer blend is drawable at greater than 800 m/sec to produce filaments having a maximum draw ratio of D,, the ratio of D,: D,, being greater than 1.15:1 and a Crimp Stability of CS,, the ratio of CS,: CS,being greater than 1.45. Preferably, the base polypropylene has a melt flow rate of between 8 and 15 g/10 min. In one embodiment, the amorphous polystyrene is characterized by a melt flow between 2 and 15 g/10 min., a tensile strength of between 6000 and 9000 psi, a modulus of between 250,000 and 500,000 psi, a flexural strength of between 8000 and 16,000 psi, a flexural modulus of between 300,000 and 500,000 psi, a Vicat softening point of between 180° F. and 240° F., and an annealed heat distortion of between 170° F and 220° F.