Poly (trimethylene terephthalate) yarn
AssigneeE. I. Du Pont de Nemours and Company
InventorsJames M. Howell, Joe Forrest London JR.
Life of this patent
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Abstract
A process for spinning a direct-use yarn, comprising extruding a polyester polymer through a spinneret to form non-round filaments at a spinning speed less than 4500 mpm and a temperature between about 255° C. and about 275° C., wherein said polymer comprises at least 85 mole % poly(trimethylene terephthalate) wherein at least 85 mole % of repeating units consist of trimethylene units, and wherein said polymer has an intrinsic viscosity of at least 0.70 dl/g, the direct-use yarn and its use.
Claims25
A process for spinning a direct-use yarn, comprising extruding a polyester polymer through a spinneret to form non-round filaments at a spinning speed less than 4500 mpm and a temperature between about 255° C. and about 275° C., wherein said polymer comprises at least 85 mole % poly(trimethylene terephthalate) wherein at least 85 mole % of repeating units consist of trimethylene units, and wherein said polymer has an intrinsic viscosity of at least 0.70 dl/g.
A direct-use yarn made from a polyester polymer melt-extruded at a spinning temperature between about 255° C. and about 275° C. and a spinning speed less than 4500 mpm, wherein said polymer comprises at least 85 mole % poly(trimethylene terephthalate) wherein at least 85 mole % of repeating units consist of trimethylene units, and wherein said polymer has an intrinsic viscosity of at least 0.70 dl/g, and wherein said direct-use yarn comprises a plurality of non-round filaments.
Dependencies are inferred from the claim text.