Patent · US Active

Continuous process for solid phase polymerisation of polyesters

US8293850B2 · kind B2 · utility

2Cited by
16References
40Claims
0Family size

Assignee

Inventor

Key dates

Filing dateJul 3, 2003
Grant dateOct 23, 2012
Priority date—
Expiry dateSep 24, 2028

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB01J2219/1943
  • WIPO fieldMacromolecular chemistry, polymers
  • WIPO sectorChemistry

Abstract

A process for the solid phase continuous polymerization of polyester in order to achieve a molecular weight increase, measurable by the intrinsic viscosity IV increase of the polyester, wherein the use of at least a reactor (15) is provided, the reactor (15) being cylindrical, rotary around its own central axis (S), substantially horizontal, slightly inclined so as to produce the polymerization of the polyester granules passing through the reactor by gravity thanks to the inclination and the rotation of the reactor (15), inside the reactor there being produced a purge gas flow having the same or the opposite direction with respect to the flow of the polyester granules.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.