Patent · US Expired

Method of making media of controlled porosity and product thereof

US6488801B1 · kind B1 · utility

68Cited by

11References

9Claims

0Family size

Assignee

FIRST QUALITY NONWOVENS, INC. · US

Inventors

Hassan Bodaghi · Brunswick, US
Michael Kauschke · Braunschweig, DE
Mordechai Turi · Princeton Junction, US

Key dates

Filing date	Jun 14, 2000
Grant date	Dec 3, 2002
Priority date	—
Expiry date	May 17, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T442/681
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A method of making a non-woven fibrous media, combining high vapor permeability and low liquid permeability, includes the steps of providing a non-woven fabric formed from fibers that are prematurely crystallized during fabric formation and have a wide heat of fusion range distribution, and calendering the fabric to soften the small polymer crystals therein of low heats of fusion, but not the relatively larger polymer crystals therein of relatively higher heats of fusion, thereby to retain high vapor permeability while providing low liquid permeability. The polymer is preferably isotactic polypropylene.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.