On-line control of molecular weight in continuous solid state polymerization processes
US9487620B2 · kind B2 · utility
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Key dates
| Filing date | Feb 28, 2013 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | Feb 28, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Methods of on-line control of molecular weight in continuous solid state polymerization processes. The solid state polymerization process can be a polyester process or to a polyamide process, and more specifically a poly(ethylene terephthalate) (PET) or a poly(butylene terephthalate) (PBT) or a nylon 6,6 continuous solid-state polymerization (SSP) process. An in-line viscometer melts and measures the molecular weight of the SSP resin and adjusts one or more of the process variables, i.e. reactor time, inert gas purity and inert gas temperature to maintain a constant resin molecular weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.