Continuous process for manufacture of lactide polymers with controlled optical purity
摘要
A process for the continuous production of polylactide polymers from lactic acid which incorporates removal of water or a solvent carrier to concentrate the lactic acid feed followed by polymerization to a low-molecular-weight prepolymer. This prepolymer is fed to a reactor in which a catalyst is added to facilitate generation of lactide, the depolymerization product of polylactic acid. The lactide generated is continuously fed to a distillation system as a liquid or vapor wherein water and other impurities are removed. The resultant purified liquid lactide is fed directly to a polymerization process.
申请公布号
US5247058(A)
申请公布日期
1993.09.21
申请号
US19920927149
申请日期
1992.08.07
申请人
CARGILL, INCORPORATED
发明人
GRUBER, PATRICK R.;HALL, ERIC S.;KOLSTAD, JEFFREY J.;IWAN, MATTHEW L.;BENSON, RICHARD D.;BORCHARDT, RONALD L.