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AssigneeE. I. Du Pont de Nemours and Company
InventorsErnst Poppe, Hans-Jurgen Huber, Ralf Hoffmann, Angelo Polese
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The invention provides a molded composition having improved noise damping properties, made of a blend of a soft thermoplastic polyether elastomer and a hard polyester resin reinforced with a fibrous or particulate filler, the molded composition having an inhomogeneous structure comprising a surface part which is rich in elastomer and depleted in the polyester resin and the reinforcing filler compared to its inner part, obtained by monocomponent injection molding of a blend of the soft and the hard polyester resin wherein only the polyester resin contains the reinforcing particulate filler. The molded composition has a flex modulus Fm in the range 0.5 to 10 GPa, and maintains a sufficient minimum tan delta damping factor t_ over a temperature range of −50° C. to 170° C.
A monocomponent-molded composition of a blend consisting essentially of a soft thermoplastic copolyether ester elastomer and a hard polyester resin reinforced with a fibrous or particulate filler, the molded composition having an inhomogeneous structure comprising an inner part and a surface part, the surface part being rich in the elastomer and poor in the polyester resin and the reinforcing filler compared to the inner part, said composition being obtained by monocomponent molding of a blend consisting essentially of the elastomer and the hard polyester resin wherein the elastomer comprises 20 to 70 weight percent of the total composition and has a flex modulus less than 0.1 GPa and a melting point in the range 155-200° C., the hard polyester resin has a flex modulus of at least 2.0 GPa and a melting point in the range 210-230° C., and only the hard polyester resin is reinforced with the particulate filler.
A method of producing a molded composition of a blend consisting essentially of a soft thermoplastic copolyether ester elastomer and a hard polyester resin reinforced with a fibrous or particulate filler, the method comprising monocomponent molding of a blend comprising the elastomer and the hard polyester resin wherein the elastomer comprisies 20 to 70 weight percent of the total composition and has a flex modulus less than 0.1 GPa and a melting point in the range 155-200° C., the hard polyester resin has a flex modulus of at least 2.0 GPa and a melting point in the range 210-230° C., and only the polyester resin is reinforced with the particulate filler, to produce a molded composition having an inhomogeneous structure comprising an inner part and a surface part, the surface part being rich in the elastomer and poor in the polyester resin and the reinforcing filler compared to the inner part.
Dependencies are inferred from the claim text.