Cationic sizing agent for paper and a process for the preparation thereof
US4434269A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1982 |
| Grant date | Feb 28, 1984 |
| Priority date | — |
| Expiry date | Feb 2, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31906
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Cationic sizing agents for paper in the form of an aqueous colloid-disperse solution having average particle diameters of from 15 to 200 nm are obtained by dissolving a water-soluble cationic, chemically uniformaly composed terpolymer compound of: PA1 (a) from 7 to 40% by weight of N,N-dimethylaminoethyl acrylate and/or methacrylate, PA1 (b) from 45 to 80% by weight of styrene, and PA1 (c) from 4 to 40% by weight of acrylonitrile in an aqueous medium, the total of components (a) to (c) always amounting to 100% by weight and at least 10% of the N,N-dimethylamino groups of the terpolymer being quaternized and the rest being protonated, and by emulsifying, in the presence of from 10 to 70% by weight, based on the following monomer mixture, of this emulsifier, PA1 (d) acrylonitrile or methacrylonitrile in quantities of from 5 to 95% by weight, with PA1 (e) C.sub.1 -C.sub.12 -alkyl esters of acrylic acid and/or of methacrylic acid in quantities of from 5 to 95% by weight, the total of components (d) and (e) amounting to 100% by weight, and by subjecting the emulsion thus obtained to a radically initiated emulsion polymerization process at temperatures of from 20.degree. to 150.degree. C…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.