Mitsui Toatsu Chemicals, Incorporated

Mitsui Chemicals, Inc.

Toshihiro Motoshima

Akihiro Yamaguchi

Atsuo Otsuji

Keisuke Takuma

Yoshimitsu Tanabe

Masakatsu Nakatsuka

Kiyoharu Hasegawa

Akio Karasawa

Kazuyoshi Kikkawa

Masahiro Ohta

Masanobu Ajioka

Hideaki Oikawa

Masatoshi Takagi

Tatsuhiro Urakami

Wataru Yamashita

Yoshihiro Sakata

Atsushi Shibuya

Rihoko Suzuki

Tomomi Yoshimura

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

Disclosed are an epoxy acrylate resin of the general formula (1) ##STR1## and an acid-modified epoxy acrylate resin obtained by reacting the epoxy acrylate resin with a carboxylic acid or an anhydride thereof, as well as curable resin compositions containing such a resin and the cured products thereof.

Epoxy acrylate resins and their uses

Heat-sensitive recording materials contain an electron-donating chromogenic compound and an electron-attracting compound. The recording materials also contain at least one compound represented by the following formula: ##STR1## wherein R.sub.1 and R.sub.3 mean a hydrogen atom or an alkyl, aralkyl or aryl group, R.sub.2 and R.sub.4 denote an alkyl, alkenyl, aralkyl or aryl group, X.sub.1, X.sub.2, Y.sub.1 and Y.sub.2 stand for an oxygen or a sulfur atom, and --Z.sub.1 -- and --Z.sub.2 -- are a specific aromatic group. Also provided are phenol compounds represented by the following formula: ##STR2## wherein R.sub.1, R.sub.2, X.sub.1 and Y.sub.1 have the same meanings as defined above; R.sub.5 and R.sub.6 are a hydrogen or halogen atom or an alkyl, alkoxy, aralkyl, aryl or hydroxyl group; p and q stand for an integer of 1-4; R.sub.5 and R.sub.6 may be either the same or different when p and q represent an integer of 2 or greater; and --Z.sub.3 -- means a specific divalent group.

Heat-sensitive recording materials and phenol compounds

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Kanagawa, Japan

Toshihiro Motoshima