Resin composition and shaped product

A production method for a resin composition comprising:

• performing melt-kneading of materials comprising;
• a polyphenylene ether resin (I);
• a polypropylene resin (II);
• a hydrogenated block copolymer (III) that is an at least partially hydrogenated product of a block copolymer including a polymer block A, in which the content of a vinyl aromatic compound portion in the polymer block A prior to hydrogenation is more than 50 mass %, and a polymer block B, in which the content of a conjugated diene compound portion of the polymer block B prior to hydrogenation is more than 50 mass % and a total amount of 1,2-vinyl bonding and 3,4-vinyl bonding of the polymer block B prior to hydrogenation is 30% to 90%;
• and
• a phosphate ester compound (IV), wherein
• relative to 100 parts by mass, in total, of the polyphenylene ether resin (I) and the polypropylene resin (II):
• the polyphenylene ether resin (I) is contained in an amount of 40 parts by mass to 99 parts by mass;
• the polypropylene resin (II) is contained in an amount of 1 part by mass to 60 parts by mass;
• the hydrogenated block copolymer (III) is contained in an amount of 1 part by mass to 20 parts by mass;
• and
• the phosphate ester compound (IV) is contained in an amount of 5 parts by mass to 45 parts by mass,
• in an extruder,
• wherein the extruder comprises in the direction of raw material flow, a first raw material feeding inlet located at an upstream side, a first vacuum vent located further downstream than the first raw material feeding inlet, a second raw material feeding inlet located further downstream than the first vacuum vent, a liquid addition pump located further downstream than the second raw material feeding inlet, and a second vacuum vent located further downstream than the liquid addition pump,
• wherein the polypropylene resin (II) is fed into the extruder in a partitioned manner from a plurality of raw material feeding inlets,
• wherein temperature between the first raw material feeding inlet and the second raw material feeding inlet is set to at least 300° C. and not higher than 320° C.,
• wherein at least one orthogonal (N-type) kneading disc element is provided between the liquid addition pump and the second vacuum vent,
• wherein ratio L1/L is 0.2 to 0.75, where L1 is a length from the first raw material feeding inlet to the addition position of the phosphate ester compound, and L is the total barrel effective length.