Optimizing polystyrene in the presence of additives
US6972311B2 · kind B2 · utility
5Cited by
7References
39Claims
0Family size
Assignee
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Key dates
| Filing date | May 27, 2003 |
| Grant date | Dec 6, 2005 |
| Priority date | — |
| Expiry date | Feb 20, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F279/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
It has been discovered that improved polystyrene products may be obtained by polymerizing styrene in the presence of at least one multifunctional initiator, at least one chain transfer agent, and at least one cross-linking agent. The presence of the multifunctional initiator tends to cause more branched structures in the polystyrene. A mathematical model that helps optimize the levels of these additives for given molecular weights, melt flow indices (MFIs) and zero shear viscosities (η0) has also been discovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.