| 发明名称 | Polylactic acid resin and method for producing same | ||
| 摘要 | The present invention is directed to a method for producing a polylactic acid resin, including the step of subjecting a crystallized prepolymer, which is a prepolymer including a lactic acid unit as a main component, and has an optical purity (Ea) of 60 to 94%, a weight average molecular weight of 5,000 to 100,000, and a crystal melting enthalpy (ΔHma) of 4 to 50 J/g, to solid phase polymerization. According to the present invention, it is possible to obtain a polylactic acid resin which is excellent in moldability upon melt processing and drawdown resistance upon melt processing, and is also excellent in hydrolysis resistance. | ||
| 申请公布号 | US9080008(B2) | 申请公布日期 | 2015.07.14 |
| 申请号 | US201214234478 | 申请日期 | 2012.07.18 |
| 申请人 | Toray Industries, Inc. | 发明人 | Tanaka Tsuyoshi;Kumazawa Sadanori;Ome Hiroyuki |
| 分类号 | C08G63/91;C08G63/06;C08G63/80 | 主分类号 | C08G63/91 |
| 代理机构 | RatnerPrestia | 代理人 | RatnerPrestia |
| 主权项 | 1. A method for producing a polylactic acid resin, comprising crystallizing a prepolymer, which includes a lactic acid unit as a main component and has an optical purity of 60 to 94% and a weight average molecular weight of 5,000 to 100,000, to obtain a crystallized prepolymer, and subjecting the crystallized prepolymer, which includes a lactic acid unit as a main component, has an optical purity (Ea) of 60 to 94%, has a weight average molecular weight of 5,000 to 100,000, and a crystal melting enthalpy (ΔHma) of 4 to 50 J/g, to solid phase polymerization to obtain a polylactic acid resin. | ||
| 地址 | Tokyo JP | ||