Crosslinked polymer microparticles derived from betaine monomers

Details Crosslinked polymer microparticles derived from betaine monomers Crosslinked polymer microparticles derived from betaine monomers

1989-03-17

1991-11-12

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526287, 526304, 526312, C08F22606, C08F22802

Patent

active

050649230

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.

REFERENCES:
patent: 3411912 (1968-11-01), Dykstra
patent: 4205152 (1980-05-01), Mizuguchi
patent: 4822847 (1989-04-01), Schulz

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