Use of quick inversion cationic emulsion polymers with polyvinylamines as retention and drainage aids

By employing a combination of quick inversion cationic emulsion polyacrylamides (QIC-EPAM) and polyvinylamine (PVAm) polymers as retention and drainage aids, the challenges of over-flocculation and high PVAm costs in papermaking with recycled fibers are addressed, resulting in improved paper production efficiency and reduced energy consumption.

WO2025072390A1 Publication Date: 2025-04-03KEMIRA OY +1
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Patent Information

Application Number
PCT/US2024/048491
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-11-09
Filing Date
2024-09-26
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

Existing retention and drainage aids for papermaking with high recycled fiber content often cause over-flocculation, leading to poor paper formation, increased dryer steam consumption, and high costs due to the use of expensive polyvinylamine (PVAm) polymers.

Method used

The use of a retention and drainage aid program comprising quick inversion cationic emulsion polyacrylamides (QIC-EPAM) and polyvinylamine (PVAm) polymers, which are added to the paper stock before forming the paper sheet, to enhance retention and drainage without over-flocculation and reduce the amount of PVAm needed.

Benefits of technology

This approach improves retention, gravimetric drainage rates, and DDA drainage time while avoiding over-flocculation and significantly reducing the dosage of PVAm, leading to more efficient paper production with lower energy consumption and costs.

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Abstract

The present invention generally relates to methods and compositions for manufacture of tissue, paper, or board and for enhancing retention and drainage thereof. In particular, the disclosure provides methods for enhancing retention and drainage by addition of a retention and drainage aid comprising quick inversion cationic emulsion polyacrylamides (QIC-EPAMS) and polyvinylamine (PVAm) polymers Preparation of paper sheets under these conditions provides improved retention, gravimetric drainage rates, and DDA drainage time, without over-flocculation and allowed for significant decrease in PVAm dosage.
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