Extrusion visbreaking
EP4770863A2Pending Publication Date: 2026-07-08DOW GLOBAL TECHNOLOGIES LLC
0 Cites 0 Cited by
Patent Information
- Application Number
- EP2024776044
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-08-28
- Filing Date
- 2024-08-27
- Publication Date
- 2026-07-08
AI Technical Summary
Technical Problem
Current post-consumer recycled (PCR) resins have a low melt index, making them unsuitable for producing food-grade products and other applications that require higher melt index polymers.
Method used
A visbreaking process involving extrusion visbreaking of base PCR ethylene-based polymer resins at temperatures of at least 250 °C and screw speeds of at least 350 revolutions per minute, or specific energy input of 0.4 to 2.0 kW-hr/kg, to increase the melt index of the resins to at least three times the original value.
Benefits of technology
The process effectively increases the melt index of PCR ethylene-based polymers, making them suitable for a wider range of applications, including food-grade products, without significantly altering other properties.
✦ Generated by Eureka AI based on patent content.
Abstract
A visbreaking process may comprise: extrusion visbreaking at least one base post-consumer recycled (PCR) ethylene-based polymer resin having a density of 0.900 to 0.975 g / cc and a melt index (I2) less than 3 dg / min at a temperature of at least 250 °C to produce a visbroken PCR ethylene-based polymer having an I2 at least 3 times greater than the at least one base PCR ethylene-based polymer resin. The at least one base PCR ethylene-based polymer resin may be extrusion visbroken at a screw speed of at least 350 revolutions per minute (RPM), a specific energy input (SEI) of from 0.4 kW-hr / kg to 2.0 kW-hr / kg, or both.
Need to check novelty before this filing date? Find Prior Art