Thermoplastic polyurethane resin composition, conductor covering material, and manufacturing method of these

A thermoplastic polyurethane resin composition, comprising:

• 100 parts by weight of a resin component formed of 58.1 parts by weight or more and 73.9 parts by weight or less of a thermoplastic polyurethane resin and 26.1 parts by weight or more and 41.9 parts by weight or less of core-shell polymer particles;
• and
• 42 parts by weight or more and 87 parts by weight or less of a phosphoric acid ester-based flame retardant,
• wherein each of the core-shell polymer particles is composed of one or more core layers and one or more shell layers, and each includes 57.1 wt % or more and 82.0 wt % or less of the core layers with respect to 100 wt % of a total of the core layers and the shell layers, and
• wherein the core-shell polymer particles have a Shore A hardness of 81 or more and 100 or less, the hardness being measured by a method in conformity with JIS K 6253-3:2012 in which:
• a type A durometer is used as a testing machine;
• an automatic timer apparatus is not used;
• a laminate obtained by laminating 6 sheets (30 mm×40 mm) each having a thickness of 1.0 mm or more and 1.5 mm or less is used as a test piece;
• the test piece is subjected to conditioning at a temperature of 23° C. and a relative humidity of 50% for 24 hours or more, and then a pressure plate is brought into contact with the test piece at a temperature of 23° C. and a relative humidity of 50%;
• and a measured value 10 seconds after the contact is read.

A thermoplastic polyurethane resin composition, comprising:

• 100 parts by weight of a resin component formed of 58.1 parts by weight or more and 73.9 parts by weight or less of a thermoplastic polyurethane resin and 26.1 parts by weight or more and 41.9 parts by weight or less of core-shell polymer particles;
• and
• 42 parts by weight or more and 87 parts by weight or less of a phosphoric acid ester-based flame retardant,
• wherein each of the core-shell polymer particles is composed of one or more core layers and one or more shell layers, and each includes 57.1 wt % or more and 82.0 wt % or less of the core layers with respect to 100 wt % of a total of the core layers and the shell layers, and
• wherein each of the one or more shell layers is composed of a polymer obtained by polymerization of a raw material including one or more kinds selected from a group consisting of a (meth)acrylic acid ester and a vinyl cyanide compound, the raw material is free of a polyfunctional monomer, the polymer having a glass transition temperature of 40° C. or more.