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USE OF SEMI-AROMATIC COPOLYAMIDE FOR TRANSPORTING REFRIGERANT FLUID

  • US 20150377389A1
  • Filed: 02/13/2014
  • Published: 12/31/2015
  • Est. Priority Date: 02/18/2013
  • Status: Active Grant
First Claim
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1. A vapor compression circuit element comprising at least one layer composed of a composition comprising copolyamide of formula X/10.T/Y, in which:

  • X represents alternatively the residues of an aliphatic amino acid comprising from 8 to 18 carbon atoms, or a lactam, or the unit X1.X2 which represents the residues resulting from the condensation of an aliphatic diamine comprising from 6 to 18 carbon atoms and a (cyclo)aliphatic dicarboxylic acid comprising from 6 to 18 carbon atoms;

    10.T represents the residues from the condensation of a decane diamine and terephthalic acid; and

    Y represents the residues from the condensation of an aliphatic diamine comprising from 9 to 14 carbon atoms and an aromatic dicarboxylic acid, Y being different from the unit 10.T;

    the molar proportion of units 10.T in the copolyamide being greater than 0%;

    the molar proportion of the units Y relative to the total of units 10.T and Y being from 0% to 30%; and

    the proportion of units X being from 0.4 to 0.8 mol per mole of semi-aromatic units 10.T and Y.

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