Dense star polymers having core, core branches, terminal groups
US4507466A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1983 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Jan 7, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S424/16
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Dense star polymers having terminal group densities greater than conventional star polymers exhibit greater and more uniform reactivity than their corresponding conventional star polymers. For example, a third generation, amine-terminated polyamidoamine dense star polymer prepared from ammonia, methyl acrylate and ethylenediamine has 1.24.times.10.sup.-4 amine moieties per unit volume (cubic Angstrom units) in contrast to the 1.58.times.10.sup.-6 amine moieties per unit volume contained by a conventional star polymer. Such dense star polymers are useful as demulsifiers for oil/water emulsions, wet strength agents in the manufacture of paper, and agents for modifying viscosity in aqueous formulations such as paints.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.