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Heat transfer compositions comprising renewably-based biodegradable 1,3-propanediol

  • US 7,988,883 B2
  • Filed: 02/12/2007
  • Issued: 08/02/2011
  • Est. Priority Date: 02/10/2006
  • Status: Active Grant
First Claim
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1. A heat transfer or antifreeze composition comprising 1,3-propanediol, an anti-corrosive in an amount of from 0.01 to 50% by weight, a defoamer in an amount of from 0.01 to 50% by weight, and a dye, wherein said 1,3-propanediol is biologically-derived, comprises peroxides wherein said peroxides concentration is less than about 10 ppm of said 1,3-propanediol, and has a bio-based carbon content of at least 1%, and wherein said composition has a lower anthropogenic CO2 emission profile as compared to a composition comprising 1,3-propanediol with a bio-based carbon content of 0%.

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