Toyo Boseki Kabushiki Kaisha

Co-op Chemical Co., Ltd.

Tsuyoshi Sekura

Masami Okamoto

Akira Yamaguchi

Nobuyuki Kinami

Yoshihiro Shinoda

Compositions are described comprising thermoplastic polyester resins comprising polyester molecules ending in terminal groups, wherein all or a part of the terminal groups are represented by the general formula --R--SO.sub.3 L, wherein R is a divalent aliphatic hydrocarbon having 1-20 carbon atoms and L is an alkali metal; an inorganic compound mixture, wherein said inorganic compound mixture comprises one or more compounds selected from the group consisting of: inorganic compounds consisting of M, Mg, Si, O and F and inorganic compounds consisting of M, Mg and F, wherein M is an alkali metal; and wherein the energy of said composition satisfies the following formulas (1) and (2):

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Urawa, Japan

Tsuyoshi Sekura