Flame-retardant polyolefin resin composition and adhesive tape substrate composed of the composition, and adhesive tape

An adhesive tape substrate composed of a molded product of a flame-retardant polyolefin resin composition, which is not cross-linked during or after a forming process thereof,

• wherein the flame-retardant polyolefin resin composition comprises the following components A-D and is substantially free of a halogen atom:
• component A:
• a thermoplastic resin of at least one member selected from the group consisting of an ethylene-ethyl acrylate copolymer and an ethylene-vinyl acetate copolymer;
• component B:
• a polymer alloy of homopolypropylene (h-PP) and ethylene-propylene rubber (EPR) or a polymer alloy of random polypropylene and ethylene-propylene rubber (EPR);
• component C:
• a modified polypropylene which is obtained by grafting a maleic anhydride on an unmodified polypropylene and having a weight average molecular weight of 10,000-80,000 and an acid value of 20-60 mg KOH/g;
• component D:
• an inorganic metal compound;
• and
• wherein the mixing weight ratio of component A, component B and component C (component A:component B:component C) is 10-60:89-30:1-10.