Mitsubishi Gas Chemical Company, Inc.

Daisuke Sanada

Satoshi Nagai

Hiroshi Mimura

Masao Hasegawa

A process for producing an impact-resistant polyacetal resin composition, which comprises a first step of mixing with shear a polyacetal resin (A), a thermoplastic polyurethane (B) and a polyhydric alcohol (C) having at least three hydroxyl groups in the molecule at a temperature of 180.degree. to 250.degree. C. and at a temperature at which said polyacetal resin (A) and said thermoplastic polyurethane (B) melt; and a second step of mixing with shear the resulting mixture obtained in the first step, in the presence of at least one compound (D) selected from the group consisting of a polyisocyanate (d.sub.1) and a compound (d.sub.2) which generates a polyisocyanate under heat, at a temperature of 180.degree. to 250.degree. C. and at a temperature at which said polyacetal resin (A) and said thermoplastic polyurethane (B) melt. The polyacetal resin composition provided by the above process is useful as a material for such parts as clips, springs, gears, bearings, cams, levers and the like in electric and electronic machines, office machines, automobiles, industrial machines, toys and/or sports goods, etc.

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Hiratsuka, Japan

Daisuke Sanada