Thermal crystallization of a molten polyester polymer in a fluid
US8039581B2 · kind B2 · utility
5Cited by
63References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2007 |
| Grant date | Oct 18, 2011 |
| Priority date | — |
| Expiry date | Jul 31, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for crystallizing a polyester polymer by introducing a molten polyester polymer, such as a polyethylene terephthalate polymer, into a liquid medium at a liquid medium temperature greater than the Tg of the polyester polymer, such as at a temperature ranging from 100° C. to 190° C., and allowing the molten polyester polymer to reside in the liquid medium for a time sufficient to crystallize the polymer under a pressure equal to or greater than the vapor pressure of the liquid medium. A process flow, underwater cutting process, crystallization in a pipe, and a separator are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.