Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1992-08-07
1993-09-21
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
525415, 526 68, 528357, 549274, C08G 6308, C07D31912
Patent
active
052470580
ABSTRACT:
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.
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Benson Richard D.
Borchardt Ronald L.
Gruber Patrick R.
Hall Eric S.
Iwan Matthew L.
Cargill Incorporated
Dodson Shelley A.
Kight III John
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