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US 4,376,148 AGranted
Impregnated non-woven sheet material with ionically solubilized resin
AssigneeNorwood Industries Inc.
InventorJohn McCartney
Life of this patent
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Abstract
A resin impregnated fibrous web is comprised of a needled fibrous batt and a polymeric resin distributed throughout the batt. The density of the impregnated web is uniform throughout with the bulk density of the web being less than the actual density of the web whereby the web is porous. The impregnated web has filaments which are both coated and uncoated with the polymeric resin. A method of forming the impregnated fibrous web is also disclosed.
Claims32
A resin impregnated fibrous web comprised of:
- a needled fibrous batt;
- a polymeric resin distributed throughout said batt forming a resin impregnated fibrous web;
- the density of said impregnated fibrous web being uniform throughout;
- the bulk density of said web being less than the actual density of said web, whereby the web is porous;
- and
- said impregnated web having filaments which are both coated and uncoated with polymeric resin and concentrations of polymeric resin.
3 more elements
A method of forming an impregnated fibrous web comprising:
- fully saturating a needled fibrous batt with an aqueous dispersion or emulsion of a polymeric resin;
- contacting the fully saturated needled batt with a coagulating agent to coagulate the polymeric resin from the aqueous dispersion and deposit the polymeric resin within said needled batt;
- and,
- drying the needled batt and polymeric resin to form an impregnated fibrous web having a uniform density throughout.
1 more element
Dependencies are inferred from the claim text.