(EN) POLYACETAL COPOLYMERS, OBTAINED BY COPOLYMERIZING (A) 100 PARTS BY WEIGHT OF TRIOXANE, (B) 0.01 TO 10 PART(S) BY WEIGHT OF AT LEAST ONE COMPOUND SELECTED FROM AMONG GLYCIDYL ETHER COMPOUNDS OF THE FOLLOWING GENERAL FORMULA (I), (II) OR (III) AND (C) 0 TO 20 PART(S) BY WEIGHT OF A CYCLIC ETHER COMPOUND [EXCLUDING THE GLYDICYL ETHER COMPOUND (B)] COPOLYMERIZABLE WITH TRIOXANE, ARE A POLYACETAL RESIN HAVING A HIGH RIGIDITY, EXCELLENT CREEP PROPERTIES, A HIGH SURFACE HARDNESS AND EXCELLENT SLIDING PROPERTIES: @@WHEREIN R1 IS A CL-12 ALKYL GROUP, AN ARYL GROUP OR A SUBSTITUTED ARYL GROUP; @@@WHEREIN R2 REPRESENTS A C2-20 POLYALKYLENE OXIDE GLYCOL RESIDUE;@@@@WHEREIN R4 REPRESENTS AN ALKYL GROUP HAVING 1 TO 30 CARBON ATOMS; R5 REPRESENTS AN ALKYLENE GROUP HAVING 1 TO 30 CARBON ATOMS.
