Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2003-08-04
2009-02-10
Gulakowski, Randy (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S415000, C549S274000, C549S231000, C528S480000
Reexamination Certificate
active
07488783
ABSTRACT:
A process for the production of polylactide, the stages of which for the production and purification of lactide, starting from an aqueous solution of lactic acid or of its derivatives, includes evaporation of water with formation of oligomers, depolymerization to give lactide, condensation and then crystallization of the crude lactide product to give purified lactide, aqueous treatment of the residual fractions from the crystallization and polymerization of purified and/or prepurified lactide to give polylactide in an extruder and in the presence of catalysts. An alternative process includes carrying out the aqueous treatment before the crystallization.
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Melt crystallization experts, internet page.
International Search Report dated Oct. 14, 2003.
Bogaert Jean-Christophe
Coszach Philippe
Van Gansberghe Frédéric
Brussels Biotech
Carlson & Gaskey & Olds
Gulakowski Randy
Toscano Alicia M
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