Conversion of sticky elastomeric polymer crumb into pellets without polymer degradation
US6458300B1 · kind B1 · utility
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21References
13Claims
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Key dates
| Filing date | May 6, 1999 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | May 6, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2948/9259
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for pelletizing elastomeric anionically polymerized polymers which comprises subjecting the polymer to solid state extrusion in a single screw extruder with a length to diameter ratio of 10:1 or less wherein the barrel of the extruder has longitudinal grooves and transversally extending pins to increase mixing wherein the temperature in the extruder is sufficient to agglomerate or melt the polymer but be lower than the degradation temperature of the polymer and the speed of the extruder screw is from 30 to 100 rpm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.