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:
Oct. 28, 2008
Filed:
Dec. 15, 2005
Jennifer Marie Galvin, Nashville, TN (US);
Henricus Jacobus Cornelis Gommeren, Hockessin, DE (US);
Rachel Elizabeth Montejo, Parramatta, AU;
Tina Amick Waller, Old Hickory, TN (US);
Jennifer Marie Galvin, Nashville, TN (US);
Henricus Jacobus Cornelis Gommeren, Hockessin, DE (US);
Rachel Elizabeth Montejo, Parramatta, AU;
Tina Amick Waller, Old Hickory, TN (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
An improved casting substrate is provided for use in a composite membrane for use as a fluid filtration medium. The composite membrane has good adhesion between the casting substrate and the microporous membrane while maintaining high permeability. The casting substrate comprises a single spunbond layer or a multiple spunbond layers formed of thermoplastic fibers, optionally comprising at least one meltblown layer. The casting substrate allows the membrane casting solution to penetrate the casting substrate uniformly to a controlled depth without penetrating through the entire thickness of the substrate. The casting substrate has good uniformity of mean pore size, basis weight, thickness and surface roughness.