Reduction of friability of poly(trimethylene terephthalate)
US6610819B2 · kind B2 · utility
1Cited by
12References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 30, 2002 |
| Grant date | Aug 26, 2003 |
| Priority date | — |
| Expiry date | May 30, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/183
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The friability of crystallized PTT and solid stated PTT can be effectively reduced by lowering the temperature of the quenching water used in the pelletizing of the melt polycondensation polymer to between 32° F. (0° C.) and 65° F. (18° C.). In addition, the robustness of solid stated PTT pellets is effectively increased by using a prepolymer with a lower intrinsic viscosity (IV) or by increasing the IV of the solid stated product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.