The present disclosure is directed to providing a resin composition that is excellent in shape retentionability and production stability, reduces die drool, and improves maintenance and management of production machines, and a cleaning method of a resin molding processing machine using the resin composition. The resin composition of the present disclosure contains at least (A) a polyethylene-based resin having a melting point of 121 to 140? C. and (B) an inorganic foaming agent. The mass ratio of the (A) component is 50 to 84 parts by mass and the mass ratio of the (B) component is 50 to 16 parts by mass when the total mass of the (A) component and the (B) component is taken as 100 parts by mass. The weight loss ratio measured using a TGA apparatus when heated from 25? C. to 200? C. under an inert gas atmosphere is 3.0 to 15 mass %.

The present disclosure is directed to providing a resin composition that is excellent in shape retentionability and production stability, reduces die drool, and improves maintenance and management of production machines, and a cleaning method of a resin molding processing machine using the resin composition. The resin composition of the present disclosure contains at least (A) a polyethylene-based resin having a melting point of 121 to 140? C. and (B) an inorganic foaming agent. The mass ratio of the (A) component is 50 to 84 parts by mass and the mass ratio of the (B) component is 50 to 16 parts by mass when the total mass of the (A) component and the (B) component is taken as 100 parts by mass. The weight loss ratio measured using a TGA apparatus when heated from 25? C. to 200? C. under an inert gas atmosphere is 3.0 to 15 mass %.