Process for producing polyamic acid solution and polyamic acid solution

Process for producing polyamic acid solution and polyamic acid solution

  • CN 101,558,102 A
  • Filed: 11/12/2007
  • Published: 10/14/2009
  • Est. Priority Date: 11/13/2006
  • Status: Active Grant
First Claim
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1. one kind by making diamines and tetracarboxylic dianhydride react the method for preparing polyamic acid solution in solvent, and described method comprises:

  • First step, that is, the tetracarboxylic dianhydride who makes diamines and molar excess reacts in the solvent of described tetracarboxylic dianhydride more than 1/3 mole water containing in every mole, prepares polyamic acid solution thus;

    WithSecond step, promptly, diamines or diamines and tetracarboxylic dianhydride are joined in the described polyamic acid solution that obtains in the described first step, make the molar weight of described diamine components be substantially equal to the molar weight of described tetracarboxylic acid component, make described diamines and described tetracarboxylic dianhydride reaction then.

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