COMPOSITE RESIN PARTICLES, AND FOAMABLE COMPOSITE RESIN PARTICLES, PRE-FOAMED RESIN PARTICLES, AND MOLDED FOAM BODY USING SAME

摘要

Composite resin particles including a polypropylene-based resin and a polystyrene-based resin, wherein the content of the polystyrene-based resin is 100 to 400 parts by mass with respect to 100 parts by mass of the polypropylene-based resin, a surface area section is in a state in which the polystyrene-based resin with a particle diameter of 0.3 μm or less is dispersed in the polypropylene-based resin, an outermost surface area section is in a state in which the polystyrene-based resin with a particle diameter of 0.3 to 1.5 μm is dispersed in the polypropylene-based resin, and the ratio of the absorbance derived from the polystyrene-based resin and the absorbance derived from the polypropylene-based resin obtained from an infrared absorption spectrum of the surface of the composite resin particles is 0.5 to 2.5.

主权项

1. Composite resin particles comprising a polypropylene-based resin and a polystyrene-based resin, wherein
a content of the polystyrene-based resin is 100 to 400 parts by mass with respect to 100 parts by mass of the polypropylene-based resin, a surface area section, being a section exceeding 0.2 μm from a surface of the composite resin particle to 1.0 μm from the surface of the composite resin particle, is in a state in which the polystyrene-based resin with a particle diameter of 0.3 μm or less is dispersed in the polypropylene-based resin, an outermost surface area section, being a section from the surface of the composite resin particles to 0.2 μm from the surface of the composite resin particles, is in a state in which the polystyrene-based resin with a particle diameter of 0.3 to 1.5 μm is dispersed in the polypropylene-based resin, and an absorbance ratio of an absorbance taken at 698 cm−1 derived from the polystyrene-based resin (D698) and an absorbance taken at 1,376 cm−1 derived from the polypropylene-based resin (D1376) obtained from an infrared absorption spectrum of the surface of the composite resin particles is (D698/D1376) 0.5 to 2.5.