Process for sizing paper with anionic hydrophobic sizing agents and cationic retention aids
US4623428A · kind A · utility
4Cited by
9References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1984 |
| Grant date | Nov 18, 1986 |
| Priority date | — |
| Expiry date | Oct 22, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C311/58
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Sizing agents, which are novel compounds and contain at least one anionic or acidic sulfonylcarbonylimide group which may be in salt form and at least two hydrophobic substituents of which at least two are linked to each other through a bridge member of the formula --CO--NH--A.sub.1 --(SO.sub.2 --NH--CO).sub.t, where A.sub.1 is a divalent or trivalent aliphatic, cycloaliphatic or aromatic radical of up to 10 carbon atoms, and t is 1 or 2, are particularly suitable, together with commercially available retention aids, for use in a process for sizing paper or cardboard.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.