Polyplastics Co., Ltd.

Kunio Suzuki

Yukio Ikenaga

Katsuhiko Takahashi

Takuzo Kasuga

Masami Yamawaki

Takuzo Kausga

A polyacetal resin composition comprises a polyacetal resin as the matrix, (A) 0.01 to 2.0 percent by weight of a stabilizer selected from a benzotriazole compound, a benzophenone compound and an aromatic benzoate compound and (B) 0.01 to 2.0 percent by weight of a hindered amine compound and is improved in whetherability.

Weather resistant polyacetal resin composition

Polyacetal resin composition containing electrically conductive carbon black is improved in respect to stability to heat by incorporating thereinto an amide compound.

Polyacetal resin composition

Polytetramethylene terephthalate is manufactured from terephthalic acid and 1,4-butanediol in two stages, a first stage comprising an esterification reaction employing an esterification catalyst and a second stage comprising a condensation-polymerization reaction. The esterification reaction is carried out in the presence of at least one acid amide compound, preferably selected from urea, a derivative thereof, mono- or poly-carboxylic acid amides having 1 to 9 carbon atoms, polyamides, phosphoric acid amides and sulfonic acid amides, whereby the production of tetrahydrofuran as a by-product is appreciably inhibited and the time required for the esterification reaction is reduced.

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Fuji, Japan

Kunio Suzuki