Polyester polymer and copolymer compositions containing particles of titanium nitride and carbon-coated iron
US7776942B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2005 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Apr 26, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2469/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyester compositions are disclosed that include polyester polymers or copolymers having incorporated therein titanium nitride particles and carbon-coated iron particles to improve the reheat properties of the compositions. The compositions may also exhibit reduced yellowness, and improved resistance to the effects of UV light. Processes for making such compositions are also disclosed. The particles may be incorporated in the polyester by melt compounding, or may be added at any stage of the polymerization, such as during the melt-phase of the polymerization. A range of particle sizes may be used, as well as a range of particle size distributions. The polyester compositions are suitable for use in packaging made from processes in which a reheat step is desirable, or decreased yellowness is desired, or increased resistance to the effects of ultraviolet light is desired, or any combination of the foregoing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.