Basf Aktiengesellschaft

Bayer Aktiengesellschaft

Werner Neubach

Fritz E Kempter

Franz Matejcek

Gerd Busse

Klaus Flory

In the production of a backed nonwoven fabric by needle-punching, calendaring or heat treatment of a spun-bonded or fiber nonwoven produced from a polymer or synthetic fiber, subsequent further processing of the resultant nonwoven with an aqueous solution or dispersion of a crosslinkable polymer or melamine resin and subsequent drying and coating with bitumen or PVC plastisol, the improvement wherein the solution or dispersion contains silica sol in a quantity such that the weight ratio of polymer:SiO.sub.2 is from about 3:1 to 1:3 and the weight ratio of melamine resin:SiO.sub.2 is from about 10:1 to 1:1. The products have improved tear strength and dimensional stability.

Backed nonwovens prepared from synthetic fibers

Aqueous nonwoven binders that give reduced formaldehyde emission on curing are based on condensation products of urea or derivatives thereof, formaldehyde and glyoxal in a molar ratio, based on the solid binder, of from 1.5 to 2.5 moles of formaldehyde and from 0.1 to 0.5 mole of glyoxal per mole of the total urea used.

Preparation of aqueous nonwoven binders of low formaldehyde emission on

Webs composed of inorganic or organic fiber material are bonded with a cured resin mixture consisting essentially of

Mineral and textile webs bonded with a cured resin mixture

A low-formaldehyde binder consists essentially of

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Ludwigshafen, Germany

Werner Neubach