E.i. Dupont De Nemours and Company

Wang, Teh-chuan

Teh-Chuan Wang

Lap-Tak Andrew Cheng

Robert Lee Rackley

Carmen Anoish Covelli

The monofilament of this invention is a polyamide of polyhexamethylene adipamide oriented from 1.0-4.0 times its original length, has a diameter of 400-1600 microns and contains 2-20% by weight, based on the weight polyamide of the monofilament, of an alkyl aryl sulfonamide plasticizer and 5.0-40.0% by weight, based on the weight of the monofilament, of abrasive particles having a particle size of 10-400 microns. These monofilaments are particularly useful as bristles used in brushes that are operated under dry conditions at relatively high temperatures.

Abrasive filaments of plasticized polyamides

This invention provides moisture stable tuftstring carpet assemblies. The pile surface structure comprises a moisture stable backing substrate, a plurality of elongated pile articles each comprising an elongated, moisture stable support strand having bonded thereto a plurality of 'U' shaped bundles of multifilament yarn. The pile articles are bonded to the backing substrate. Different backing substrates and support strands may be used.

Moisture stable tuftstring carpet

Oriented polymeric monofilaments having a diameter of at least about 60 mils and excellent uniformity in roundness, and a process for their preparation by extrusion of the monofilament in at least two stages, orienting, and coating with a layer of unoriented polymer.

Coated large diameter oriented monofilaments

Oriented polymeric tape of a blend of copolyetherester and polyethylene terephthalate characterized by excellent fray resistance, and a process for its preparation.

Oriented polymeric tape

A process for the preparation of oriented polymeric tape of a blend of copolyetherester and polyethylene terephthalate, by blending the components at a temperature above the higher crystalline melting point of the two polymeric components for a minimum melt residence time.

Oriented polymeric tape preparation

Oriented polymeric monofilaments having a diameter of at least about 60 mils and excellent uniformity in roundness, and a process for their preparation by extrusion of the monofilament in at least two stages.

Large diameter oriented monofilaments

Coated oriented polymeric monofilaments having a diameter of at least about 60 mils and excellent uniformity in roundness are prepared in which a core of semi-crystalline linear condensation polymer is melt extruded, quenched to a substantially void-free condition, coated with additional polymer to increase the diameter by about from 10 to 100 mils, quenched to a substantially void-free condition, oriented by drawing about 3.5 times its original length within the orientation temperature range of the polymer, and the resulting oriented structure is coated with about from 10 to 100 mils of polymeric material.

Process for the preparation of coated large diameter oriented

Oriented polymeric monofilaments having a diameter of at least about 60 mils and excellent uniformity in roundness, are prepared in which a core of semi-crystalline linear condensation polymer is melt extruded, quenched to a substantially void-free condition, coated with additional polymer to increase the diameters by about from 10 to 100 mils, quenched to a substantially void-free condition, and oriented by drawing about 3.5 times its original length within the orientation temperature range of the polymer.

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Parkersburg, WV, United States of America

Teh-Chuan Wang