Search All Applications in Biodegradable Packaging
Application US20180346682
Published 2018-12-06
Method Of Recovering Lactide
A method of recovering lactide which includes introducing a molten resin composition that contains a polylactic acid, a depolymerization catalyst and a carrier resin into a vent chamber (3) that is maintained under a reduced pressure using a first screw conveyer passage (11) that extends in the vent chamber (3), gasifying the lactide contained in the molten resin composition, and recovering a gaseous lactide from the vent chamber, wherein a second screw conveyer passage (60) is provided under the first screw conveyer passage (11) in the vent chamber (3) to recover the carrier resin.
Much More than Average Length Specification
View the Patent Matrix® Diagram to Explore the Claim Relationships
USPTO Full Text Publication >
- 1. A method of recovering lactide comprising introducing a molten resin composition that contains a polylactic acid, a depolymerization catalyst and a carrier resin into a vent chamber that is maintained under a reduced pressure by using a first screw conveyer passage that is extending in the vent chamber, gasifying the lactide contained in said molten resin composition, and recovering a gaseous lactide from said vent chamber, wherein a second screw conveyer passage is provided under said first screw conveyer passage in said vent chamber to recover the carrier resin.
- 9. A method of recovering lactide comprising introducing a molten resin composition that contains a polylactic acid, a depolymerization catalyst and a carrier resin into a vent chamber that is maintained under a reduced pressure by using a screw conveyer passage that is extending in the vent chamber, gasifying the lactide contained in said molten resin composition, and recovering a gaseous lactide from said vent chamber, wherein a return member is provided over the screw conveyer passage to return the resin masses formed accompanying the gasification of said lactide back to said screw conveyer passage.
