| 摘要 |
An electrically conductive polyacetal composition having improved toughness and flexibility, as well as good fluidity and processability. The composition includes an oxymethylene polymer, an elastomeric polyurethane, and an electrically conductive carbon black having a lower structure level (DBP absorption) and larger particle size (lower surface area) than conductive carbon blacks heretofore used in these compositions. The composition includes between about 65 and about 85 percent, by weight, of the oxymethylene polymer, between about 10 and about 20 percent, by weight, of the electrically conductive carbon black, and between about 10 and about 20 percent, by weight, of the elastomeric polyurethane. The electrically conductive carbon black has a surface area BET (N2) of between about 40 and about 100 m2/g, and a pore volume, DBP absorption, of between about 150 and about 350 ml/100g. The electrically conductive carbon black used in the present compositions is more easily dispersed in the composition polymers and lessens any increase in melt viscosity during compounding. |
