Production of dyed polymer microparticles
US6964747B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2003 |
| Grant date | Nov 15, 2005 |
| Priority date | — |
| Expiry date | Feb 10, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2989
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A dye, such as a fluorescent dye, is incorporated into polymer microparticles using a solvent system composed of a first solvent in which the dye and the microparticle polymer are soluble, a second solvent in which the dye and the microparticle polymer are not or only weakly soluble, and a third solvent in which the dye and the microparticle polymer are not or only weakly soluble. The first and second solvents are immiscible with each other, or at most partially miscible. The third solvent is miscible with the first and second solvents. The formulation provides substantially complete partitioning of the dye to the microparticles. The method may be used to obtain dyed polymer microparticle formed of cross-linked or non-cross-linked polymers. Libraries are provided comprising two or more sets of microparticles of different dye loadings. Fluorescent core-shell microparticles are produced from a mixture of microparticle cores incorporating one or more fluorescent dyes, a polymerization mixture comprising at least one polymerizable shell monomer, at least one free radical polymerization initiator comprising a water-insoluble oxidizing agent, and at least one water-soluble reducing agent…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.