Celanese Gmbh

Hoechst Celanese Corporation

Baylor D Gibson

Clinton Dale Felton

George A Serad

Charles E Jamison

William O McWhorter

Hans-Tobias Macholdt

Werner Groh

Herman D Mims

James Robert Walden

John A Willes, Sr

Clinton D Felton

The use of additives to produce polymer electrets with improved charge stability. In particular, the invention relates to the use of specific charge control agents used for toners that are blended with various polymers at suitable concentrations to enhance the charge lifetime of the electrets. The charge control agents include a triphenylmethane compound, a polymeric ammonium compound, and arylsulfide compound and azochromium complex.

Polymer electrets with improved charge stability

A filament winding process for a melt-processable, thermoplastic matrix material, and a reinforcing fiber. The process is heat and pressure intensive. An on-line consolidation is provided.

On-line consolidation of filament wound thermoplastic parts

Continuous processes for the preparation of electrets and the products produced thereby, including filter fabrics, are disclosed. The process employs a continuous film or continuous filaments in the form of a tightly packed warp having a warp density as determined by light transmission of not more than 40%. The continuous film or continuous filament in the form of a tightly packed warp are continuously fed one or more times through a corona charging station having electrodes disposed on both sides of the material being treated, the material being treated being simultaneously heated while being subjected to a corona discharge of from 6 KV to 20 KV direct current.

Electret process and products

Electret making process using corona discharge

A textile traverse rod guide device particularly suited for the guiding of winding of yarns onto packages is described wherein the traverse guide substantially reduces the noise level of winding machine when in operation. The traverse guide is capable of reducing the noise level on the order of 5 to 8 decibels compared to previously used devices while at the same time providing better package build. The noted traverse guide is fabricated as a single piece from engineering plastics and operates utilizing torque-tension principles rather than mechanical guidance and swivel means.

Noise reducing textile traverse rod

Growing community of inventors

Waxhaw, NC, United States of America

Baylor D Gibson