Process for forming a laminate of a nanoweb and a substrate and filters using the laminate
AssigneeE. I. Du Pont de Nemours and Company
InventorsAntoine Schelling, Anil Kohli
Life of this patent
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Abstract
A process for forming a laminate of a low basis weight nanoweb and a substrate includes forming a nanoweb on the surface of a collection scrim, and subsequently bringing the nanoweb into contact with a substrate coated with adhesive. The laminate is suitable for use as a gas filtration medium.
Claims13
A process for forming a composite sheet comprising a substrate adhesively laminated to a nanoweb, the process comprising:
- (a) providing a carrier layer having a collection surface;
- (b) forming a nanoweb on the collection surface of the carrier layer;
- (c) providing a flexible porous substrate having two major surfaces;
- (d) applying a layer of adhesive to at least a portion of one surface of the substrate;
- (e) contacting the adhesive layer with the nanoweb and bonding the nanoweb to the substrate;
- and
- (f) optionally removing the carrier layer, thus forming the composite sheet.
A filter element for separating particulate matter from a gas stream comprising a filter medium comprising a substrate having two major surfaces wherein the substrate is adhesively laminated over one of the major surfaces to a first nanoweb having a basis weight less than about 2 gsm.
A filter element for separating particular matter from a gas stream comprising a filter medium comprising exactly one substrate having two major surfaces wherein the substrate is adhesively laminated to a first nanoweb over one of the major surfaces in a face-to-face relationship having a basis weight less than about 2 gsm.
Dependencies are inferred from the claim text.