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An Antioxidant Additive to Perfluoropolyether Lubricants

IP.com Disclosure Number: IPCOM000040861D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Ardakani, AA: AUTHOR [+3]

Abstract

Perfluoroalkylpolyether lubricants of the following structures are known to have a wide variety of applications ranging from aerospace programs to magnetic recording disk technology. Some of these applications often require a direct contact between perfluoroalkyl polyethers and metal surfaces at some elevated temperatures, creating an environment where perfluoroalkyl polyether lubricants can undergo extensive oxidative degradation at temperatures well below their normal decomposition temperatures Their effectiveness as protective lubricants is thus reduced, giving rise to mechanical systems which suffer higher failure rate in a much shorter period of time.

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An Antioxidant Additive to Perfluoropolyether Lubricants

Perfluoroalkylpolyether lubricants of the following structures are known to have a wide variety of applications ranging from aerospace programs to magnetic recording disk technology. Some of these applications often require a direct contact between perfluoroalkyl polyethers and metal surfaces at some elevated temperatures, creating an environment where perfluoroalkyl polyether lubricants can undergo extensive oxidative degradation at temperatures well below their normal decomposition temperatures Their effectiveness as protective lubricants is thus reduced, giving rise to mechanical systems which suffer higher failure rate in a much shorter period of time.

One of the solutions to prevent or to reduce this oxidative- metal catalyst decomposition of perfluoroalkyl polyether lubricant is the addition of a small percentage (1 to 5%) of an antioxidant. In order to be effective, the antioxidant must be chemically stable and an effective lubricant. Most of the commercially available antioxidants fail to meet all of the above criteria; compatibility appears to be the major obstacle.

Disclosed here is the preparation of a new class of antioxidan which not only is totally compatible with the perfluoroalkyl polye lubricants, but also possesses the required thermal and chemical stability.

Thus, a carboxylic acid terminated perfluoropolypropylene oxide (I), having molecular weight from 1,000 to 5,000 was converted to it...