Thermoplastic polymer composition, production method thereof, and shaped article and electric cable obtained therefrom

摘要

Propylene-based resin compositions contain an inorganic filler in a high ratio and are excellent in flexibility, mechanical strength, elongation at break, heat resistance, scratch resistance, whitening resistance and flame retardancy. Shaped articles comprise the compositions.;A first propylene-based resin composition of the present invention contains 5 to 64.9% by weight of a propylene-based polymer (A) having a melting point, as measured by differential scanning calorimetry (DSC), in the range of 120° C. to 170° C.; 0 to 59.9% by weight of a propylene-based polymer (B) having a melting point, as measured by differential scanning calorimetry (DSC), of less than 120° C. or having no observed melting point; 0.1 to 30% by weight of a graft-modified propylene-based polymer (C) obtained by graft modifying a propylene-based polymer having a melting point, as measured by differential scanning calorimetry (DSC), of less than 120° C. or having no observed melting point; and 35 to 75% by weight of an inorganic filler (D) (here, the total amount of (A), (B), (C) and (D) is 100% by weight).

主权项

1. A thermoplastic polymer composition comprising the following (A) to (D);
(A) 5 to 64.9% by weight of a propylene-based polymer having a melting point, as measured by differential scanning calorimetry (DSC), in the range of 120° C. to 170° C.; (B) 0 to 59.9% by weight of a propylene-based polymer having a melting point, as measured by differential scanning calorimetry (DSC), of less than 120° C. or having no observed melting point; (C) 0.1 to 30% by weight of a graft-modified propylene-based polymer obtained by graft modifying a propylene-based polymer (C-1) having a melting point, as measured by differential scanning calorimetry (DSC), of less than 120° C. or having no observed melting point, with at least one vinyl compound containing a polar group; and (D) 35 to 75% by weight of an inorganic filler, wherein, the total amount of (A), (B), (C) and (D) is 100% by weight; wherein the propylene-based polymer (C-1) is
a copolymer (C-1a) of propylene with an α-olefins having 4 to 20 carbon atoms which satisfies the following (i) and (ii):
(i) the molecular weight distribution (Mw/Mn) as measured by gel permeation chromatography (GPC) is in the range of 1 to 3;(ii) the melting point (Tm)(° C.) and the content M (mol %) of constituent units derived from the comonomer as determined by 13C-NMR spectrum satisfy the following relation (1), and the Tm is less than 120° C., and
146exp(−0.022M)≧Tm≧125exp(−0.032M)  (1)which contains 50 to 90 mol % of constituent units derived from propylene and 10 to 50 mol % of constituent units derived from the α-olefins having 4 to 20 carbon atoms (the total of propylene and the α-olefins having 4 to 20 carbon atoms is 100 mol %), ora random copolymer (C-1b) of propylene, ethylene and an α-olefin having 4 to 20 carbon atoms which satisfies the following (m) and (n):
(m) the molecular weight distribution (Mw/Mn) as measured by gel permeation chromatography (GPC) is in the range of 1 to 3;(n) the random copolymer (C-1b) contains 60 to 85 mol % of constituent units derived from propylene, 5 to 30 mol % of constituent units derived from ethylene and 5 to 30 mol % of constituent units derived from the α-olefin having 4 to 20 carbon atoms, and the total of constituent units derived from propylene, constituent units derived from ethylene and constituent units derived from the α-olefin having 4 to 20 carbon atoms is 100 mol %; wherein the vinyl compound containing a polar group is an unsaturated carboxylic acid or a derivative thereof, the derivative being selected from the group consisting of acid halide compounds, amide compounds, imide compounds and acid anhydrides; and wherein the graft amount of the vinyl compound having a polar group in the graft-modified propylene-based polymer (C) obtained is 0.05 to 5% by weight.