Patent · US Active

Production of wetlaid-spunbond laminate membrane support

US7470639B2 · kind B2 · utility

13Cited by
18References
10Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMar 7, 2006
Grant dateDec 30, 2008
Priority date—
Expiry dateAug 31, 2027

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10T442/689
  • WIPO fieldChemical engineering
  • WIPO sectorChemistry

Abstract

Nonwoven fabric laminates suitable for use as semipermeable membrane supports are produced by forming a spunbond nonwoven fabric first layer of continuous thermoplastic polymer filaments; forming a wet-laid nonwoven fabric second layer of discrete length thermoplastic polymer fibers; and bonding the first and second layers in opposing face-to-face relationship to form a composite support, where the first and second layers define first and second outer surfaces of the composite support. The resulting semipermeable membrane supports provide an advantageous balance of properties, including smoothness, porosity, interlaminar adhesion, and flux properties.

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