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Tannic Acid Treatment of Polyurethanes

IP.com Disclosure Number: IPCOM000096134D
Original Publication Date: 1963-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Haines, RS: AUTHOR

Abstract

Magnetic tape drive rollers composed of polyurethane resin have a tendency to stick to the back of the tape after it dwells on the rollers between operations. The stickiness of polyurethane rollers is alleviated by immersing the rollers in a 2% aqueous tannic acid solution for 45 minutes at 200 to 210 degrees F. The treating solution has a dual effect on the surface of the polyurethane roller. The tannic acid in the solution acts as a leaching agent to remove some of the uncured low molecular weight constituents. The high temperature of the solution acts as a curing media for the remaining uncured material at the surface of the polyurethane material.

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Tannic Acid Treatment of Polyurethanes

Magnetic tape drive rollers composed of polyurethane resin have a tendency to stick to the back of the tape after it dwells on the rollers between operations. The stickiness of polyurethane rollers is alleviated by immersing the rollers in a 2% aqueous tannic acid solution for 45 minutes at 200 to 210 degrees F. The treating solution has a dual effect on the surface of the polyurethane roller.

The tannic acid in the solution acts as a leaching agent to remove some of the uncured low molecular weight constituents. The high temperature of the solution acts as a curing media for the remaining uncured material at the surface of the polyurethane material.

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