Fines retention in papermaking with amine functional polymers

Details Fines retention in papermaking with amine functional polymers Fines retention in papermaking with amine functional polymers

1992-01-24

1993-08-03

Chin, Peter

Paper making and fiber liberation

Processes and products

Plural fiber containing

1621646, 162166, 162167, 1621682, D21H 1745

Patent

active

052325539

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.

REFERENCES:
patent: 3840489 (1974-10-01), Stazdins
patent: 4421602 (1983-12-01), Brunnmueller et al.
patent: 4808683 (1989-02-01), Itagaki et al.
patent: 4843118 (1989-06-01), Lai et al.
patent: 4895621 (1990-01-01), Hassler

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