Crosslinked polymer microparticles derived from betaine monomers having three-dimensional network
US5064923A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1989 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | Mar 17, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F246/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polymer microparticles having a three-dimensional network structure and an average particle size of 0.01 to 1 micron are obtained by emulsion polymerization of ethylenically unsaturated monomeric composition containing (a) at least one polyfunctional monomer having a plurality of polymerizable sites, or (b) a combination of two ethylenically unsaturated monomers each bearing mutually reactive functional groups in an aqueous medium in the presence of a compound or resin having a betaine group. The betqine compound or resin is incorporated into the polymer microparticles by physically adhering or covalently binding thereto to enhance the dispensing stability of the microparticles over a wide range of pH.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.