Mitsui Chemicals, Inc.

Mitsui Toatsu Chemicals, Incorporated

Tomomi Yoshimura

Wataru Yamashita

Masahiro Ohta

Hideaki Oikawa

Yoshihiro Sakata

Atsushi Shibuya

Keisuke Takuma

Akihiro Yamaguchi

Shoji Tamai

Masanobu Ajioka

Atsuo Otsuji

Masatoshi Takagi

Tatsuhiro Urakami

Akio Karasawa

Rihoko Suzuki

Toshihiro Motoshima

There is disclosed an organic optical component prepared from a resin essentially comprising one or more repetitive structural units selected from the group consisting of structures represented by general formula (1); ##STR1## wherein A is either of the groups below. ##STR2## This invention provides an organic optical component with excellent transparency, heat resistance and mechanical strength as well as a low birefringence. This invention also provides a novel aromatic polyamide with a low permitivity and excellent transparency, processability and thermal stability, besides excellent heat resistance inherent in an aromatic polyamide.

Fluorine-containing polyamide

A low-birefringent organic optical component comprising a polymer prepared by polymerizing a racemic mixture of the monomer with an asymmetric spiro ring represented by general formula (1) as an essential ingredient; wherein ring A represents a monocyclic or polycyclic organic group, wherein two ring As are mutually bound each other via a spiro bond to form a spiro ring which has a molecular asymmetric structure; n is an integer of 0 to 10; X.sub.1 and Y.sub.1 are binding groups; and Z.sub.1 is a polymerization-active group. The component has excellent transparency, mechanical strength and heat resistance, as well as a low birefringence.

Low-birefringent organic optical component and a spirobiindan polymer

A low birefringent organic optical component prepared from a resin consisting essentially of one or more repetitive structural units selected from the group consisting of structures represented by general formula (1); ##STR1## wherein A is either of the groups below. ##STR2## The organic optical component can exhibit excellent transparency, heat resistance and mechanical strength as well as a low birefringence. Also provided is a novel aromatic polyamide with a low permitivity and excellent transparency, processability and thermal stability, besides excellent heat resistance inherent in an aromatic polyamide.

Organic optical component

A is a polyimide based resin molding composition comprising 100 parts by weight of crystalline polyimide having recurring structural units of the formula (1): ##STR1## and 1.about.50 parts by weight of crystallization accelerators selected from bisimide compounds of specific structure, a mixture of bisimide compounds, and imide based oligomer. The composition remarkably accelerates the crystallization velocity of polyimide of the formula (1), crystallization can be completed within a greatly reduced cooling time after melt processing, and the crystallized polyimide resin has excellent properties.

Polyimide based resin composition

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Kanagawa, Japan

Tomomi Yoshimura