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Aromatic polyester composition

  • US 6,590,044 B2
  • Filed: 08/15/2002
  • Issued: 07/08/2003
  • Est. Priority Date: 06/26/1998
  • Status: Expired due to Fees
First Claim
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1. An aromatic polyester composition comprising:

  • (A) (a) an ethylene naphthalenedicarboxylate copolymer which contains an ethylene naphthalenedicarboxylate unit in an amount of 94 to 80 mol % based on the total of all the recurring units and an ethylene terephthalate units and/or an ethylene isophthalate unit in an amount of 6 to 20 mol % based on the total of all the recurring units and a diethylene glycol unit in an amount of 0.8 to 2.5 wt % and which has a number of terminal carboxyl groups of 40 eq/106 g or less and a total number of terminal groups of 95 eq/106 g or more, and (b) an ethylene terephthalate (co)polymer which contains an ethylene terephthalate unit in an amount of 100 to 80 mol % based on the total of all the recurring units and an ethylene naphthalenedicarboxylate unit and/or an ethylene isophthalate unit in an amount of 0 to 20 mol % based on the total of all the recurring units and a diethylene glycol unit in an amount of 1.2 to 2.4 wt % and which has a number of terminal carboxyl groups of 30 eq/106 g or less, an intrinsic viscosity of 0.7 or more and a melting temperature of 250°

    C. or less, the contents of the ethylene naphthalenedicarboxylate copolymer and the ethylene terephthalate (co)polymer being 5 to 95 wt % and 95 to 5 wt % based on the total weight of these, respectively;

    (B) compatibility between the ethylene naphthalenedicarboxylate copolymer and the ethylene terephthalate (co)polymer being 0.15 to 0.5; and

    (C) the relationship represented by the following expression (1) being satisfied when the proportion of the ethylene naphthalenedicarboxylate unit to the total of all the recurring units of the ethylene naphthalenedicarboxylate copolymer and all the recurring units of the ethylene terephthalate (co)polymer is 50 mol % or less;



    Tm

    254−

    28×

    EN




    (1)wherein EN is the molar fraction of the ethylene naphthalenedicarboxylate unit in the polyester composition and Tm is the melting point (°

    C.) of the polyester composition, 

    and the relationship represented by the following expression (2) being satisfied when the proportion of the ethylene naphthalenedicarboxylate unit to the total of all the recurring units of the ethylene naphthalenedicarboxylate copolymer and all the recurring units of the ethylene terephthalate (co)polymer is more than 50 mol %;

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