PROCESS FOR PREPARING POLYMERIC PARTICLES

A process for preparing polymeric particles involves a stepwise or gradient emulsion polymerization. The polymeric particles contain polymerized units of methacrylic acid and further monomers, with an overall monomer composition by weight of polymerized units of 5 to 25% by weight of methacrylic aci...

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Bibliographische Detailangaben
Hauptverfasser:	ASSMUS, Manfred, ENDRES, Thomas
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON HUMAN NECESSITIES HYGIENE MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MEDICAL OR VETERINARY SCIENCE METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	A process for preparing polymeric particles involves a stepwise or gradient emulsion polymerization. The polymeric particles contain polymerized units of methacrylic acid and further monomers, with an overall monomer composition by weight of polymerized units of 5 to 25% by weight of methacrylic acid and 75 to 95% by weight of further monomers. The further monomers are selected from C1- to C4-alkylesters of methacrylic acid and/or C1- to C4-alkylesters of acrylic acid. The ratio by weight of polymerized units of methacrylic acid to further monomers increases stepwise or in a gradient from the center to the surface of the particles and the polymeric particles are obtained in the form of an aqueous dispersion.