Unsaturated polyaminopolymer, derivatives thereof and processes for making
US5278255A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1992 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Aug 11, 2012 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/55
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is a process for preparing a polyaminopolymer which contains functionality comprising the steps of (a) contacting a polyfunctional amine with an unsaturated alkylating agent under reaction conditions to form an amine/unsaturated alkylating agent adduct; (b) contacting the adduct with a polyfunctional compound such that a polyaminopolymer is formed; (c) contacting the polyaminopolymer with a halogen, hypohalous acid or precursor thereof such that a polyaminopolymer having halohydrin or dihalo functionality is formed; and (d) raising the pH of the polyaminopolymer having halohydrin or vicinal dihalo functionality sufficiently to cause an increase in molecular weight. Alternatively, the invention is a process having steps (a), (b), (c) and optionally (d), but with a step (h) between steps (b) and (c) of contacting the polyaminopolymer with a crosslinking agent therefor having at least two functional groups reactive with amine groups such that a crosslinked polyaminopolymer is formed. The invention includes polyaminopolymers so prepared, papers prepared using such polymers, and processes for preparing such papers. The papers so prepared preferably have improved we…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.