Aqueous solution of cationic copolymers of acrylamide, manufacturing process and use
Patent Information
- Application Number
- DE602015091238
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2014-01-15
- Filing Date
- 2015-01-15
- Publication Date
- 2025-03-19
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing polymers used in paper manufacturing processes have limited drainage performance and require high dosages to achieve desired properties, which can lead to increased costs and complexity in industrialization.
Aqueous polymer solutions with improved drainage properties are obtained by subjecting cationic or amphoteric copolymers, resulting from Hofmann degradation, to a specific post-processing involving pH adjustments. This process includes increasing the pH to at least 5.5 and then lowering it to between 2 and 5, which enhances the viscosity and drainage performance of the polymers.
The post-processed polymers exhibit significantly improved drainage performance compared to untreated polymers, allowing for reduced dosages while maintaining or exceeding the properties of previous art technologies, thus enhancing productivity and cost-effectiveness in paper manufacturing.