Patent ID: 7884140

Claim:
A blend of recycled thermoplastic resins, comprising: a primary polymer type, wherein the primary polymer type is ABS and makes up about 80 to about 99 parts by weight of the blend; residual additives including two or more additives selected from the group consisting of antioxidants, heat stabilizers, UV stabilizers, flame retardants, antistatics, blowing agents, impact modifiers, compatibilizers, fillers, fiber reinforcements, fluorescent whiteners, and lubricants, wherein the residual additives comprise about 2 to about 7 parts by weight of the blend; and one or more secondary polymer types that are dissimilar to the primary polymer type and are selected from recycled blends of polycarbonate with an impact modified styrene acrylontirile copolymer, copolymer blends of styrene acrylonitrile and acrylate polymers, polysulfone, copolymers of styrene and acrylonitrile, polycarbonate, polyvinyl chloride, polyurethane, high impact styrene copolymers, general purpose polystyrene and polyolefin, wherein a first polymer of the one or more secondary polymer types is a styrene acrylonitrile copolymer that comprises about 0 to about 19 parts by weight of the blend and a second polymer of the one or more secondary polymer types comprises about 0 to about 7 parts by weight of the blend and the blend includes the secondary polymer type; wherein: the primary polymer type includes two or more grades of the primary polymer type, wherein different grades are characterized by different molecular weights, different molecular composition, different polymer structure or morphology, the blend of recycled thermoplastic resins includes a greater amount of the primary polymer type than the secondary polymer type, the blend is recovered from waste plastic material derived from one or more post consumer sources selected from office automation equipment, white goods, consumer electronics, automotive shredder residue, building waste and post industrial molding and extrusion scrap, the blend is a thermoplastic resin, the blend has a density of about 1.06 to about 1.10 grams per cubic centimeter, as determined by ASTM D 792, a melt flow rate of about 2 to about 9 grams per 10 minutes, as determined by ASTM D 1238, a tensile stress at yield of about 36 to about 48 MPa, as determined by ASTM D 638, a notched Izod impact (3.2 mm width of notch) of about 85 to about 200 Joules per meter, as determined by ASTM D 256 and the parts of the blend add up to 100.