Microcapsules

US5292835A · kind A · utility

Assignee

• BASF SE

Inventors

• Ekkehard Jahns · Weinheim, DE
• Ulrich Freundschuh · Heidelberg, DE

Key dates

• Filing date: Jul 21, 1993
• Grant date: Mar 8, 1994
• Expiry date: Jul 21, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2987
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Microcapsules useful for producing pressure-sensitive recording materials are obtainable by polymerizing PA1 A) 30-100% by weight of one or more C.sub.1 -C.sub.24 -alkyl esters of acrylic or methacrylic acid (monomers I), PA1 B) 0-80% by weight of a bi- or polyfunctional monomer (monomer II) which is soluble in a solvent which is insoluble or only sparingly soluble in water, and PA1 C) 0-40% by weight of other monomers (monomers III), the solvent being present alone or together with the monomers and a free radical initiator as the disperse phase of a stable oil-in-water emulsion and the polymerization being initiated and controlled by the thermal decomposition of the free radical initiator.