To provide a polyoxymethylene resin composition wherein deterioration of excellent mechanical properties and frictional wear resistance of a polyoxymethylene homopolymer is prevented and its secondary shrinkage and sliding property against shaft holes are improved.
The polyoxymethylene resin composition contains (A) a polyoxymethylene resin and (B) a dynamically crosslinked elastomer in a specific compounding ratio, provided that the component (A) comprises (A1) a polyoxymethylene homopolymer and/or (A2) a linear polymer of polyoxymethylene having a specific group at one end, wherein the number average molecular weight of a part excluding the end group is 10,000-500,000 and (A3) a polyoxymethylene block copolymer which has a specific chemical structure and has a number average molecular weight of 10,000-500,000. Here, the mass ratio of the total of the components (A1) and (A2) to the component (A3) is from 95/5 to 5/95, and the component (B) has a compression set (C-Set, 100°C) of 90-10%.
COPYRIGHT: (C)2010,JPO&INPIT
Morihiro Horio
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Shinji Oga
Toshifumi Onuki