Poly (trimethylene terephthalate) pellets and method for production thereof
US6916535B2 · kind B2 · utility
1Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2002 |
| Grant date | Jul 12, 2005 |
| Priority date | — |
| Expiry date | Apr 6, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a poly(trimethylene terephthalate) pellet comprising 80 wt % or more of trimethylene terephthalate repeating units copolymerized with bis(3-hydroxypropyl) ether at a ratio in a range from 0.01 to 2 wt %, wherein an amount of terminal carboxyl groups is 25 milli-equivalent/kg or less and an intrinsic viscosity is in a range from 0.8 to 2 dl/g, which pellet has an L* value of 75 or more, a b* value in a range from −2 to 5, and a weight in a range from 1 to 50 mg/piece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.