Filamentous polymer particles and method for preparing same by means of controlled radical polymerisation in emulsion
US9745399B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 16, 2011 |
| Grant date | Aug 29, 2017 |
| Priority date | — |
| Expiry date | Aug 9, 2032 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/28
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to polymer particles in the form of filaments formed by block copolymers, as well as to the method for preparing same by means of controlled radical polymerization in emulsion in the presence of a specific living macroinitiator derived from a nitroxide. The invention is characterized in that the filamentous particles are obtained in a dispersed aqueous medium by means of the synthesis of said block copolymers, performed by heating the reaction medium at a temperature of 60 to 120° C., the final block copolymer containing between 10 and 50 mol. % of the macroinitiator which is water soluble and the hydrophobic monomer conversion rate being at least 50%. According to the invention, the weight ratio of hydrophilic fraction of the filamentous particles is less than 25 wt %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.