Polyamic acid and polyimide

Details Polyamic acid and polyimide Polyamic acid and polyimide

2007-07-09

2011-11-29

Seidleck, James J (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C528S310000, C528S335000

Reexamination Certificate

active

08067527

ABSTRACT:
A polyamic acid comprising at least 10 mol % repeating units represented by the formula [1] or [2]; and a polyimide represented by the formula [3] or [4] which is obtained from the polyamic acid. A polyimide film having high heat resistance and satisfactory in light-transmitting properties and tensile strength is obtained from the polyamic acid.(In the formulae, R1and R2each independently represents hydrogen or C1-10alkyl; R3and R4each independently represents hydrogen, halogeno, C1-10alkyl, or phenyl or the R3and R4on adjoining carbon atoms are bonded to each other to form C3-8cycloalkyl or phenyl; R5represents a divalent organic group; and n is an integer of 2 or larger.)

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Gauvry et al., Synthesis, No. 4, pp. 574-576, (1999).

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