Controlling moisture in and plasticization of bioresorbable polymer for melt processing
US10213949B2 · kind B2 · utility
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17References
14Claims
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Key dates
| Filing date | Sep 11, 2015 |
| Grant date | Feb 26, 2019 |
| Priority date | — |
| Expiry date | May 3, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Methods and systems for controlling the moisture content of biodegradable and bioresorbable polymer resin during extrusion above a lower limit that allows for plasticization of the polymer resin melt and below an upper limit to reduce or prevent molecular weight loss are disclosed. Methods are further disclosed involving plasticization of a polymer resin for feeding into an extruder with carbon dioxide and freon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.