| 摘要 |
<p>Biodegradable aliphatic polyester particles, preferably polyglycolic acid or polylactic acid particles, which have (A) a weight average molecular weight of 50,000 or more, (B) an average particle diameter of 5-500 µm, and (C) a water content of 900 ppm or more, and which preferably also have (D) compressive breaking strength of 1,500 gf/cm2 or less when molded into a cylindrical tablet by applying a load of 100 gf/cm2 at 40ºC for 24 hours in a cylindrical mold and/or (E) a weight average molecular weight retention rate of 65% or more after elapsing 50 days at 40ºC; and a process for producing the biodegradable aliphatic polyester particles, which is characterized by comprising grinding a particulate biodegradable aliphatic polyester at a temperature equal to or lower than the glass transition temperature (Tg) of the biodegradable aliphatic polyester.</p> |
