Browse Prior Art Database

Anti Static Elastomer

IP.com Disclosure Number: IPCOM000074201D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Schwartz, PM: AUTHOR

Abstract

Elastomer formulations based on resilient polyurethane are used in the production of drive elements. Where such drive elements are used at relatively high speeds and in contact with low-conductivity materials, electrostatic charges are developed which are detrimental to efficient material handling.

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Anti Static Elastomer

Elastomer formulations based on resilient polyurethane are used in the production of drive elements. Where such drive elements are used at relatively high speeds and in contact with low-conductivity materials, electrostatic charges are developed which are detrimental to efficient material handling.

Drive formulations which allow removal of substantially all of the electrostatic charge resulting from relative movement between a low-conductivity material and a resilient drive member are based on elastomeric polyurethane to which small amounts of phosphate esters have been added. Suitable elastomeric polyurethanes include ADIPRENE* L-100 and SOLITHANE** 291, while NOPCOSTAT*** PE 137 phosphated polyethoxylated aliphatic alcohol is a good source of phosphate ester. Typical formulations include, by weight: Polyurethane elastomer 100 parts 4,4-Methylene-bis(2-chloroaniline), curing agent 9-12 parts Phosphate ester 1-10 parts Defoaming agent as needed. Suitable mixing temperatures are at about 100 degrees C, and cure temperatures of about 150 degrees C for 1 hour are desirable.

One area where the build up of electrostatic charges are prevalent is at the elastomeric drive capstan of a magnetic tape transport system. Electrostatic charges generated at the capstan can be dissipated by the use of a drive member made in accordance with the above formulation. * Trademark of E. I. du Pont de Nemours & Co. ** Trademark of Thiokol Chemical Corp. *** Tradema...