Block copolymer oil return agents
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United States of America Patent
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Jan 7, 2014
Grant Date -
Jan 13, 2011
app pub date -
Feb 18, 2009
filing date -
Feb 29, 2008
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Abstract
The present invention relates to fluorine free polymeric oil-return agents that increase the miscibility of lubricants such as mineral oils and/or oxygenated lubricants with refrigerants in order to improve oil return and system performance of refrigeration systems. It was discovered that fluorine free block copolymers having a block compatible with the oil phase, and at least one block compatible with the refrigerant phase can effectively compatibilize lubricating oils with HFC and HFO refrigerants.
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