Highly filled thermoplastic compositions prepared with fine particle size filler
AssigneeE. I. Du Pont de Nemours and Company
InventorsFrederick G. Schumacher, Walter Yllo
Life of this patent
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Abstract
Highly filled thermoplastic compositions of improved characteristics useful as sound-deadening sheeting for automotive carpet are obtained by blending about 5-50% by weight of an ethylene interpolymer, such as ethylene/vinyl ester, ethylene/unsaturated mono- or dicarboxylic acids or esters of said unsaturated acids, etc.; about 2-15% by weight of processing oil; and about 50-90% by weight of fine particle size filler. Pellets prepared from these compositions remain free flowing even after storage under load.
Claims23
A composition consisting essentially of (a) from about 5 to about 50% by weight of at least one copolymer of ethylene with at least one comonomer selected from the group consisting of vinyl esters of saturated carboxylic acids wherein the acid moiety has up to 4 carbon atoms, unsaturated mono- or dicarboxylic acids of 3 to 5 carbon atoms, and esters of said unsaturated mono- or dicarboxylic acids wherein the alcohol moiety has 1 to 8 carbon atoms, the ethylene content of said copolymer being at least about 60% by weight, the comonomer content of said copolymer being from about 5 to about 40% by weight, and the melt index of said copolymer being from about 0.1 to about 150, provided that when said copolymer of ethylene is an ethylene/vinyl ester copolymer said copolymer can contain up to about 15% by weight of carbon monoxide or sulfur dioxide;
- (b) from about 2 to about 15% by weight of processing oil;
- and (c) from about 50 to about 90% by weight of filler having sufficiently fine particle size to enable production of a smooth, continuously extruded sheet, strand, or tube, substantially free of melt fracture and such that when said strand is pelletized it yields pellets that are free flowing.
Dependencies are inferred from the claim text.