Sound-deadening material

摘要

A sound-deadening material is described for use in sound deadening within metal panels of an automobile. The material comprises a non-woven fabric with a mouldable impregnant composition. The sound-deadening material may be moulded substantually to the shape of an associated panel. The impregnant composition comprises carboxylated styrene-butadiene co-polymers along with a mineral filler and other property specific constituents such as fire retardents. The non-woven fabric includes at least 10 % polyester fusible fibres. The impregnant composition is most conveniently achieved by combining at least 15 % carboxylated styrene-butadiene co-polymer with more than 55 % of this co-polymer being styrene with at least 5 % carboxylated styrene-butadiene co-polymer with not more than 50 % of this co-polymer being styrene along with at least 50 % of the impregnant being a mineral filler such as spesclay.