Patent ID: 8337962

Claim:
A resin film comprising a resin and an organic acid monoglyceride represented by the following formula (1), wherein the content of the organic acid monoglyceride to the resin is from 0.1 to 20% by mass: X-L-(R 1 ) n wherein: X represents an acid group wherein the acid dissociation constant is 5.5 or less; L represents a di- or more valent linking group; R 1 represents an alkyl group having from 6 to 30 carbon atoms, an alkenyl group having from 6 to 30 carbon atoms, an alkynyl group having from 6 to 30 carbon atoms, an aryl group having from 6 to 30 carbon atoms or a from 6 to 30 membered heterocyclic group, and each group may have a further substituent; and n represents the number expressed by: (the valent number of L)−1; wherein the organic acid monoglyceride is one having a structure in which one of the three hydroxyl groups of glycerin forms an ester bond with a fatty acid, a second hydroxyl group is an unsubstituted hydroxyl group and the third hydroxyl group forms an ester bond with a polycarboxylic acid and has an acid group derived from the polycarboxylic acid.