Fines retention in papermaking with amine functional polymers
US5232553A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1992 |
| Grant date | Aug 3, 1993 |
| Priority date | — |
| Expiry date | Jan 24, 2012 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/34
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Polyvinylaminals, optionally as the formed copolymer with polyvinyl hemiaminals, and polyvinyl acetals are added to a papermaking pulp slurry to improve the retention of fines in the final paper product. This polymer is provided by reacting a poly(vinylamine) which can be a homopolymer or a copolymer containing vinyl alcohol and vinyl amine units with a monoaldehyde. The aldehyde, such as butyraldehyde, modifies the structure of the polymer and increases its hydrophobicity. The use of these polymers in papermaking involving the recycle of waste papers provides notable advantages in fines retention because of the high level of fines which normally accompany such recycle paper waste.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.