Polyethylene blends containing virgin and recycled hdpe materials
EP4587513A1Pending Publication Date: 2025-07-23DOW GLOBAL TECHNOLOGIES LLC
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Patent Information
- Application Number
- EP2023805234
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-10-11
- Filing Date
- 2023-10-11
- Publication Date
- 2025-07-23
AI Technical Summary
Technical Problem
Recycled HDPE polymers often have low crack resistance, making them unsuitable for blow-molding applications, while virgin polymers that improve crack resistance may compromise rigidity, necessitating a blend that balances both properties for commercial use.
Method used
A blend of 25 to 90 weight percent recycled HDPE with 10 to 75 weight percent virgin bimodal HDPE, having specific density and flow index ranges, is used to achieve a balance of rigidity and environmental stress crack resistance for blow-molded parts.
Benefits of technology
The blend provides enhanced melt strength, rigidity, and crack resistance, enabling the production of high-quality blow-molded articles with improved durability and performance.
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Figure 1.1
Abstract
A high-density polyethylene blend that contains from 25 to 90 weight percent recycled high-density polyethylene; and from 10 to 75 weight percent virgin bimodal high-density polyethylene having a density from 0.94 g / mL to 0.956 g / mL and a flow index (I21) from 25 g / 10 min.to 40 g / 10 min, exhibits good physical properties for blow molded articles, including good melt strength, rigidity, and crack resistance.
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