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Process for making continuous films of ordered poly(ether ketone ketones)

  • US 5,049,340 A
  • Filed: 12/18/1989
  • Issued: 09/17/1991
  • Est. Priority Date: 12/18/1989
  • Status: Expired due to Term
First Claim
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1. A continuous process for casting a high quality amorphous structure selected from the group consisting of films and sheets (film or sheet) having a thickness of about 2.5 to 250 micrometers from an ordered poly(ether ketone ketone) resin consisting essentially of two repeating units (a) and (b) represented by the following formulas ##STR3## and ##STR4## where A is the p,p'"'"' -Ph-O-Ph- group, and Ph stands for the phenylene radical;

  • B is p-phenylene; and

    D is m-phenylene;

    where the (a) and (b) units occur at a ratio in the range of 80;

    20 to 25;

    75;

    said resin having an inherent viscosity at 30°

    C., determined for a 0.5 g/100 ml solution in concentrated sulfuric acid, or about 0.6-1.2;

    said process comprising the consecutive stages of melt-extruding the resin at a temperature of at most 400°

    C. through a die having lips through which the extended structure exits the die at a die pressure of at least 1.4 MPa, directing the molten extrudate onto the cylindrical surface of a rotating quench drum maintained at a temperature between 100°

    C. and 170°

    C. so that the resin layer forms a thin layer thereon, maintaining the molten resin layer in contact with the surface of the quench drum until the resin solidifies into the structure (a film or sheet), and removing the structure (film or sheet) from the quench drum.

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