Crosslinked molded article and production method thereof

A crosslinked molded article comprising a reaction product of a polymer composition comprising:

• a polymer having a terminal double bond,
• a hydrosilyl group-containing compound (Y) having at least two hydrosilyl groups per molecule;
• a platinum-based catalyst (Z) for hydrosilicon crosslinking;
• and
• a reaction inhibitor (D),
• the crosslinked molded article satisfying the following Requirement (I):
• Requirement (I):
• provided that (x) is a point at the center of the crosslinked molded article, (z) is a point, which is at the shortest distance from the point (x), on a surface of the crosslinked molded article, and (y) is a point at which a line segment connecting the point (x) and the point (z) is internally divided in a ratio of 2:1, a surface crosslinking density (A) of the crosslinked molded article from the point (z) to the point (y) and an internal crosslinking density (B) of the crosslinked molded article from the point (x) to the point (y) satisfy the following relational Formula (7):
• (A)/(B)<1.10 Formula (7);
• and,
• wherein the polymer having a terminal double bond is an ethylene/α-olefin/non-conjugated polyene copolymer (S) having structural units derived from ethylene (A), an α-olefin (B) having 3 to 20 carbon atoms, and a non-conjugated polyene (C) containing per molecule a total of two or more partial structures each selected from the group consisting of the structures of the following general formulae (I) and (II);
• and satisfying the following requirements (i) to (v):
• (i) a molar ratio of the ethylene/α-olefin is from 40/60 to 99.9/0.1;
• (ii) a weight fraction of structural units derived from the non-conjugated polyene (C) is 0.07 wt % to 10 wt % based on 100 wt % of the ethylene/α-olefin/non-conjugated polyene copolymer (S);
• (iii) a weight average molecular weight (Mw) of the ethylene/α-olefin/non-conjugated polyene copolymer (S), a weight fraction of structural units derived from the non-conjugated polyene (C) (weight fraction of (C) (wt %), and a molecular weight of the non-conjugated polyene (C) (molecular weight of (C)) satisfy the following Formula (1):
• 4.5≤Mw×weight fraction of (C)/100/molecular weight of (C)≤40 Formula (1);
• (iv) a ratio P of a complex viscosity η*(ω=0.1) (Pa·sec) at a frequency ω of 0.1 rad/s to a complex viscosity η*(ω=100) (Pa·sec) at a frequency ω of 100 rad/s (η*(ω=0.1)/η*(ω=100)) where the complex viscosities are obtained by linear viscoelasticity measurement (190° C.) using a rheometer, an intrinsic viscosity [η] and the weight fraction of structural units derived from the non-conjugated polyene (C) (weight fraction of (C)) satisfy the following Formula (2):
• P/([η]2.9)≤weight fraction (C)×6 Formula (2);
• and
• (v) a number of long-chain branches per 1000 carbon atoms (LCB1000C), which is obtained by using 3D-GPC, and a natural logarithm of the weight average molecular weight (Mw) represented by [Ln (Mw)] satisfy the following Formula (3):
• LCB1000C≤1−0.07×Ln (Mw) Formula (3).