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Reinforced thermoplastic polymer composite sheets, formable into smooth, shaped objects in a stamping process. The composite sheet is produced by laminating together (1) a first layer of thermoplastic resin containing short nonsiliceous fibers and a mineral filler such as kaolin, (2) a backing reinf

Reinforced thermoplastic polymer composite sheets, formable into smooth, shaped objects in a stamping process. The composite sheet is produced by laminating together (1) a first layer of thermoplastic resin containing short nonsiliceous fibers and a mineral filler such as kaolin, (2) a backing reinforcing layer comprising a long nonsiliceous fiber mat impregnated by thermoplastic resin and (3) optionally a third layer similar to said first layer. The long fiber mat is positioned within the reinforcing layer during impregnation, whereby the mat becomes encased in a resin matrix.

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A thermoplastic composite, laminated sheet comprising, in terms of percent by weight of each layer: (a) at least one layer comprising from about 40 percent to 100 percent of a synthetic thermoplastic polymer, about 0 percent to 50 percent of a particulate filler, and up to about 45 percent short non

A thermoplastic composite, laminated sheet comprising, in terms of percent by weight of each layer: (a) at least one layer comprising from about 40 percent to 100 percent of a synthetic thermoplastic polymer, about 0 percent to 50 percent of a particulate filler, and up to about 45 percent short nonsiliceous fibers having a length ranging from 0.01 to ¾of an inch and arranged generally parallel to the plane of the sheet surface, (b) a reinforcing layer adjoining said one layer comprising 50 percent to 100 percent of synthetic thermoplastic polymer on an extruded basis, a long nonsiliceous fiber mat comprised of fibers having a length of at least 1 inch and having a weight ranging from 0.5 to 16 ounces per square foot, particulate filler ranging from 0 percent to 50 percent on an extruded basis and (c) mat positioning means disposed between said at least one layer and said mat, for holding said mat within said reinforcing layer during formation of said composite, said mat being substantially encased in a matrix of the thermoplastic polymer.