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Surface Treatment of Polyurethane

IP.com Disclosure Number: IPCOM000093201D
Original Publication Date: 1967-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Anderson, HR: AUTHOR [+2]

Abstract

Polyurethane elastomer, when used as a contact element, has a tendency to stick. For example, magnetic tape drive stop shoes, composed of polyurethane, have a tendency to stick to anodized brake wheels. Such sticking occurs under conditions of prolonged contact at high temperature and high relative humidity. Stickiness of polyurethane is alleviated as follows:

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Surface Treatment of Polyurethane

Polyurethane elastomer, when used as a contact element, has a tendency to stick. For example, magnetic tape drive stop shoes, composed of polyurethane, have a tendency to stick to anodized brake wheels. Such sticking occurs under conditions of prolonged contact at high temperature and high relative humidity. Stickiness of polyurethane is alleviated as follows:

1. The material is extracted with toluene for 18 hours to remove all soluble components.

2. It is then dried for 2 hours under vacuum conditions at a temperature of 80 degrees C.

3. The material is then immersed for one hour in a stirred refluxing solution of 2 to 10% by weight polymethylene polyphenylisocyanate, PAPI, in toluene. The solution contains 1% dibutyl tin dilaurate, based on the weight of PAPI.

4. After removal from the treatment solution, the material is cured under vacuum conditions at a temperature of 105 degrees C for one hour.

5. It is then once more extracted with toluene for about 18 hours.

6. Finally, the material is dried at 80 degrees C under vacuum conditions for 4 to 18 hours.

This treatment results in the formation of polyurethane elastomer material having an absence of stickiness.

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