Thermoplastic crosslinked rubber composition

A method for manufacturing a thermoplastic crosslinked rubber composition (A) from 1 to 99 parts by weight of a hydrogenated rubber obtained by hydrogenating not less than 50% of total double bonds of at least one homopolymer rubber of a conjugated diene monomer or a random copolymer rubber consisting of a conjugated diene monomer unit and an aromatic vinyl monomer unit and (B) from 1 to 99 parts by weight of an olefinic thermoplastic resin, total amount of (A) and (B) being 100 parts by weight, said (A) being partially or completely crosslinked, wherein said (A) is crystalline rubber, having a crystallization temperature in a range of from −50 to 70° C. and a heat quantity of crystallization at peak in a range of from 3 to 100 J/g in differential scanning calorimetry (DSC method),

• said method comprising mixing said (A) from 1 to 99 parts by weight of at least one homopolymer rubber of a conjugated diene monomer or a copolymer rubber of a conjugated diene monomer unit and an aromatic vinyl monomer unit or a hydrogenated rubber thereof and said (B) from 1 to 99 parts by weight of a thermoplastic resin, total amount of (A) and (B) being 100 parts by weight, and optionally (C) a crosslinking agent, and melt mixing to perform dynamic crosslinking using a melt extruder at a degree of mixing M defined as follows;
• M=(π2/2)(L/D)D3(N/Q)
• 10×106≦M1000×106
• wherein, L is a length of extruder from a feed section to die (mm), D is an inner diameter of extruder barrel (mm), Q is an output rate (kg/h) and N is a revolving speed of screw (rpm).