Laminate film

摘要

A laminate film comprises a base layer A formed of a thermoplastic resin A and a coating film layer B present on one surface of the base layer A. The coating film layer B contains a binder resin, inert fine particles and a surfactant. The surfactant consists essentially of 0.1 to 15 % by weight of a surfactant X having an HLB value of 10 to 14 and 10 to 40 % by weight of a surfactant Y having an HLB value of 16 to 18.5 based on the solid content of the coating film layer B to ensure that the average HLB value defined by the following equation be 15 to 18: $wherein\; HLB(X)\; is\; an\; HLB\; value\; of\; the\; surfactant\; X,\; P(X)\; is\; a\; weight\; fraction\; of\; the\; surfactant\; X\; with\; respect\; to\; the\; total\; weight\; of\; the\; surfactants\; X\; and\; Y,\; HLB(Y)\; is\; an\; HLB\; value\; of\; the\; surfactant\; Y,\; and\; P(Y)\; is\; a\; weight\; fraction\; of\; the\; surfactant\; Y\; with\; respect\; to\; the\; total\; weight\; of\; the\; surfactants\; X\; and\; Y.\; The\; laminate\; film\; is\; useful\; as\; a\; base\; for\; a\; magnet\; recording\; medium.$