Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2006-07-18
2006-07-18
Hightower, P. Hampton (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S125000, C528S126000, C528S128000, C528S172000, C528S173000, C528S176000, C528S179000, C528S183000, C528S185000, C528S220000, C528S229000, C528S350000, C528S353000
Reexamination Certificate
active
07078477
ABSTRACT:
In the process of the present invention, a solvent-soluble polyimide is produced by polycondensing at least one tetracarboxylic acid component with at least one diamine component in a solvent in the presence of a tertiary amine. The tetracarboxylic acid component is selected from the group consisting of tetracarboxylic dianhydrides represented by the following formula 1:wherein R is as defined in the specification, and tetracarboxylic acids and their derivatives represented by the following formula 2:wherein R and Y1to Y4are as defined in the specification. Unlike the conventional techniques using an excessively large amount of a chemical imidation agent such as acetic anhydride and a chemical imidation catalyst such as triethylamine, in the process of the present invention, the solvent-soluble polyimide having a high polymerization degree is easily produced in a solvent with good productivity by using only a catalytic amount of the tertiary amine.
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Bito Tsuyoshi
Kihara Shuta
Oguro Hiroki
Antonelli, Terry Stout and Kraus, LLP.
Hampton Hightower P.
Mitsubishi Gas Chemical Company Inc.
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