PROBLEM TO BE SOLVED: To obtain a grafted-surface solid highly and uniformly controlled in the primary structure (molecular weight, molecular weight distribution, manner of monomer sequence, etc.), of a graft chain and a surface graft density in the necessary region of a solid surface by grafting a polymer chain onto the surface of a solid through monomolecularly built-up polymerization initiator.
SOLUTION: The surface of a solid is not limited on its kind and may be, for example, an inorganic matter such as an oxide, a simple atomic matter such as Si, or a metal. The monomolecular buildup is performed by the Langmuir-Blodgett method. Therefore, polymerization initiating groups are introduced into the surface of a solid by using a polymerization initiator compound of a structure having a hydrophobic group and a hydrophilic group. Generally, a structure represented by the formula: R1-A-B-R2 (wherein R1 is a hydrophilic group hydrolyzable into hydroxyl or the like; R2 is a polymerization initiating active group; and A and B are each an organic group). The hydrophilic group is exemplified by an alkoxysilyl. The monomolecularly built-up polymerization initiation groups can be inactivated with an actinic radiation.