Film and flexible metal-clad laminate

A film, comprising:

• a heat-resistant polyimide film;
• and
• an adhesive layer on at least one side surface of the heat-resistant polyimide film, wherein the adhesive layer comprises a crystalline thermoplastic polyimide,
• wherein the film shows an endothermic peak area attributed to melting of the crystalline thermoplastic polyimide in differential scanning calorimetry, and an absolute value of the endothermic peak area is 4.0 mJ/mg or higher,
• wherein the crystalline thermoplastic polyimide is produced by a process comprising imidizing a polyamic acid obtained by reacting at least one diamine component and a dianhydride component,
• wherein the at least one diamine component is selected from the group consisting of 1,4-bis(4-aminophenoxy)benzene, 1,3-bis(4-aminophenoxy)benzene, 4,4′-bis(4-aminophenoxy)biphenyl, and
• wherein the dianhydride component is 3,3′,4,4′-biphenyl tetra carboxylic dianhydride.