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:
Jan. 09, 2024
Filed:
Jan. 11, 2021
Dupont Safety & Construction, Inc., Wilmington, DE (US);
Jan Van Meerveld, Remich, LU;
Corneille Schmitz, Aywaille, BE;
Joseph Mathieu, Esch-sur-Alzette, LU;
Noel Stephen Brabbs, Garnich, LU;
Orest Skoplyak, Newark, DE (US);
Christine Lemoine, Waldbredimus, LU;
Serge Rebouillat, Echenevex, FR;
DUPONT SAFETY & CONSTRUCTION, INC., Wilmington, DE (US);
Abstract
A sheet comprising a plexifilamentary film-fibril network consisting essentially of high density polyethylene in an overlapping multi-directional configuration, the sheet, as-produced from a spin cell, having a normalized Frazier air permeability of between 0.002 and 0.2 m/m·minute at 50 gsm, a BET surface area of between 9 and 20 m/gm, and a normalized hydrohead of between 150 and 250 cm at 50 gsm, wherein the plexifilamentary film-fibril network in an overlapping multi-directional configuration is flash-spun from a spin fluid comprising polymer and spin agent, the spin fluid temperature being 190° C. or greater, the spin agent comprising dichloromethane, the spin fluid having a polymer concentration of 12 to 14 weight percent.