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Zero ODP, halogen-free azeotropes as blowing agents for plastic foams.

Author(s) : ASHIDA K., MORIMOTO K., YUFU A.

Summary

Due to the ozone depletion potential (ODP) problems of CFCs and HCFCs, a number of alternative physical blowing agents for isocyanate-based foams, e.g., urethane foams, are being investigated. Among them, two representative candidates are HFC and halogen-free, aliphatic hydrocarbons, e.g., cyclopentane. Another accompanying problem of CFCs and HCFCs is global warming potential. The paper describes azeotropic blowing agents having no halogens (hereinafter referred to as AZBs). The AZBs employed in the study comprise a C5-C7 hydrocarbon and a compound selected from the group consisting of C2-C4 carboxylic acid esters, C3-C4 ketones, and C4 ethers. The AZBs have the following advantages: zero ODP, lower foam densities, lower K-factor, better compatibility with foaming ingredients, similar boiling point and polarity as R11, hence CFC-based formulations could be used without further formulation studies, and lower costs.

Details

  • Original title: Zero ODP, halogen-free azeotropes as blowing agents for plastic foams.
  • Record ID : 1997-0198
  • Languages: English
  • Source: Stratospheric Ozone Protection for the 90's. 1995 International CFC and Halon Alternatives Conference & Exhibition. Conference proceedings.
  • Publication date: 1995/10/23
  • Document available for consultation in the library of the IIR headquarters only.

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