Amine functional poly(vinyl alcohol) for improving properties of recycled paper
US5380403A · kind A · utility
27Cited by
11References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1993 |
| Grant date | Jan 10, 1995 |
| Priority date | — |
| Expiry date | Mar 22, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2810/50
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The addition of an amine functional poly(vinyl alcohol) in a process for making recycled paper products results in improvements in both the wet and dry strength of the resultant products. The amine functional poly(vinyl alcohol) used in the process is formed by the hydrolysis of vinyl acetate/vinyl amide copolymers or vinyl acetate/allyl amine copolymers, or optionally may be formed by the reaction of poly(vinyl alcohol ) with an amino-aldehyde dialkyl acetal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.