Patent ID: 8354479

Claim:
A method for producing a functional filler, comprising a step of: mixing a solution of D-lactic acid or L-lactic acid and/or D-lactide or L-lactide with a silicon-based alkoxide to perform a dehydration polymerization reaction, wherein the D-lactic acid or L-lactic acid and/or D-lactide or L-lactide is polymerized to obtain a poly-D-lactic acid or poly-L-lactic acid, wherein the poly-D-lactic acid consists of 80% or more of D-lactic acid and the poly-L-lactic acid consists of 80% or more of L-lactic acid, and wherein the silicon-based alkoxide is polymerized and the poly-D-lactic acid or poly-L-lactic acid is chemically bound to a reactive group on the polymerized silicon-based alkoxide.