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Biodegradable Aliphatic-Aromatic Polyesters

  • US 20080214702A1
  • Filed: 03/17/2006
  • Published: 09/04/2008
  • Est. Priority Date: 03/18/2005
  • Status: Active Grant
First Claim
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1. Biodegradable aliphatic/aromatic copolyester (AAPE) comprising:

  • A) an acid component comprising repeating units of;

    1) 50 to 60 mol % of an aromatic polyfunctional acid;

    2) 40 to 50 mol % of an aliphatic acid, at least 90% of which is a long-chain dicarboxylic acid (LCDA) of natural origin selected from azelaic acid, sebacic acid, brassylic acid or mixtures thereof;

    B) at least one diol component;

    said aliphatic long-chain dicarboxylic acid (LCDA) and said diol component (B) having a number of carbon atoms according to the following formula;


    (CLCDA·

    y
    LCDA)/2+CB·

    y
    B>

    7.5where;

    CLCDA is the number of carbon atoms of the LCDA and can be 9, 10 or 13;

    yLCDA is the molar fraction of each LCDA on the total number of moles of LCDA;

    CB is the number of carbon atoms of each diol component;

    yB is the molar fraction of each diol on the total number of moles of the diol component (B) said AAPE having;

    a biodegradability after 90 days higher than 70%, with respect to pure cellulose according to the Standard ISO 14855Amendment 1, —

    a density of equal to or less than 1.2 g/cc;

    a number average molecular weight Mn of 40,000-140,000;

    an inherent viscosity of 0.8-1.5.

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