Back to results
US 5,688,874 AGranted
Process for preparing blends of poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalenedicarboxylate)
AssigneeEastman Chemical Company
InventorDouglas Claire Hoffman
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process comprising solid state polymerizing an immiscible polyester blend which has not been substantially melt esterified under conditions sufficient to produce a polyester blend which when remelted becomes clear. Polyester blends having improved I.V., color and low acetaldehyde are also disclosed.
Claims13
A process comprising:
- solid state polymerizing an immiscible polyester blend comprising a first polyester of poly(ethylene) terephthalate homopolymer or copolymer and a second polyester of poly(ethylene) naphthalenedicarboxylate homopolymer or copolymer, wherein said immiscible polyester blend displays a transesterification level of less than about 10% under conditions sufficient to produce a polyester blend having a transesterification level between about 10% and about 20% which when remelted becomes clear.
Dependencies are inferred from the claim text.