Ethylene-based polymer, polyethylene-based resin composition and use thereof, catalyst component for olefin polymerization, olefin polymerization catalyst containing the component, and method for producing ethylene-based polymer by using the catalyst

A polyethylene-based resin composition, comprising:

• (A) from 41 to 99 wt % of an ethylene-based polymer (A) satisfying the following condition (A-1) to condition (A-4);
• and
• (B) from 1 to 59 wt % of an ethylene-based polymer (B) satisfying the following condition (B-1) to condition (B-6),
• wherein:
• MFR of the composition as a whole is from 0.05 to 50 g/10 min and the density is from 0.910 to 0.960 g/cm3;
• conditions of ethylene-based polymer (A):
• (A-1) MFRA=0.3 to 100 g/10 min measured under conditions of 190° C. and a load of 21.18 N (2.16 kg) in accordance with JIS K7210,
• (A-2) DensityA=0.915 to 0.970 g/cm3,
• (A-3) [Mw/Mn]A=2.0 to 10.0, and
• (A-4) in a double logarithmic plot of elongation viscosity η(t) (unit:
• Pa·sec) and elongation time t (unit:
• sec) measured at a temperature of 170° C. and an elongation strain rate of 2 (unit:
• 1/sec), assuming that the maximum elongation viscosity after strain hardening is ηA;max(t1) and the approximate straight line of the elongation viscosity before hardening is ηA;Linear(t), the degree of strain hardening [λmax(2.0)]A defined by ηA;max(t1)/ηA;Linear(t1) is from 1.0 to 2.0;
• conditions of ethylene-based polymer (B):
• (B-1) MFRB=0.01 to 1.5 g/10 min and 100>MFRA/MFRB>1.0 min measured under conditions of 190° C. and a load of 21.18 N (2.16 kg) in accordance with JIS K7210,
• (B-2) DensityB=0.880 to 0.940 g/cm3,
• (B-3) [Mw/Mn]B=2.0 to 10.0,
• (B-4) [λmax(2.0)]B defined in the same manner as in the condition (A-4) is from 1.2 to 20.0 and 20>[λmax(2.0)]B/[λmax(2.0)]A>1.0,
• (B-5) the ratio [λmax(2.0)]B/[λmax(0.1)]B of [λmax(2.0)]B defined in the same manner as in the condition (A-4) and [λmax(0.1)]B measured similarly by setting the elongation strain rate to 0.1 (unit:
• 1/sec) is from 1.2 to 10.0, and
• (B-6) the polymer is produced by an ethylene polymerization reaction in the presence of a transition metal-containing catalyst.