Polyamide acid and polyimide, and optical material

Details Polyamide acid and polyimide, and optical material Polyamide acid and polyimide, and optical material

2005-08-02

2005-08-02

Hightower, P. Hampton (Department: 1711)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C528S125000, C528S126000, C528S128000, C528S172000, C528S173000, C528S174000, C528S176000, C528S179000, C528S183000, C528S188000, C528S220000, C528S229000, C528S350000, C528S352000, C528S353000, C428S001100, C428S001260, C428S001270, C428S473500, C385S123000, C385S129000, C385S141000, C385S143000

Reexamination Certificate

active

06924348

ABSTRACT:
A polyimide excelling in heat resistance, chemical resistance, water repellency, dielectric characteristics, electrical characteristics, and optical characteristics and a polyamide acid useful as the raw material therefor are provided. Specifically, a polyamide acid containing a chlorine atom and a fluorine atom and comprising a repeating unit represented by the following formula (1):(wherein X and X′ independently denote a divalent organic group; Y and Y′ independently denote a chlorine, bromine, or iodine atom; p and p′ denote independently denote the number of fluorine atom {F in the formula (1)} bonded to the relevant benzene ring, representing an integer of 0-3; q and q′ independently denote an integer of 0-3; and p+q total 3, and p′+q′ total 3).

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