| 摘要 |
PURPOSE:To attempt to form a composite resin compsn. being capable of providing a printing roll having high heat resistance and rigidity, excellent wear resistance and sound absorbing property and high dimensional accuracy, by compounding a specified highly rigid polypropylene homopolymer with a specified amt. of a crystalline polypropylene random copolymer and an inorg. filler. CONSTITUTION:The following three components (a)-(c) are compounded. A highly rigid polypropylene homopolymer (a) wherein a boiling n-heptane insoluble part has an isotactic pentad fraction (P<0>) of 0.975 or higher and a pentad fraction (P<2>) having two different configuration of 0.002 or lower, 10-45wt.% crystalline polypropylene random copolymer (b) and 5-15wt.% inorg. filler (c) are compounded. As the component (a), a polymer having a melt flow rate(MFR) of 0.1-3g/10min is pref. As the component (b), a polymer which is a crystalline polymer contg. 70wt.% or higher propylene component and a crystalline ethylene-propylene random copolymer, a crystalline ethylene-propylene-butene-1 random terpolymer or a mixture thereof is used. |
