Process for the production of microcapsules

US4412959A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Christian Wegner · Cologne, DE
• Gert Jabs
• Manfred Dahm · Leverkusen, DE

Key dates

• Filing date: Jun 8, 1981
• Grant date: Nov 1, 1983
• Expiry date: Jun 8, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2985
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of microcapsules by interfacial polyreaction, which comprises mixing a first reactant with an emulsion of a solution of a material to be encapsulated and a second reactant whereby the first and second reactants react to form a capsule containing the said material and wherein the second reactant dissolved in the disperse phase is a nitrogen-containing heterocyclic compound corresponding to one of the formulae I, II or III ##STR1## wherein at least two of the radicals A, B, D and E are halogen atoms, ammonium, hydrazinium, sulfonium, optionally substituted alkyl sulfonyl, aryl sulfonyl, aralkyl sulfonium, azido, aryloxy, thiocyano arylthio and sulfonic acid residues which are reactive under the conditions of the capsule-forming reaction and the remaining radicals A, B, D, E are hydrogen, alkyl, aryl, alkoxy, phenoxy, alkylamino or phenylamino radicals which are not reactive under the conditions of the capsule-forming reaction.