Microcapsules and their use

US5292610A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Gunter Helling · Siegburg, DE
• Michael Muller · Bensberg, DE
• Wolfgang Podszun · Neunburg vorm Wald, DE

Key dates

• Filing date: Mar 6, 1992
• Grant date: Mar 8, 1994
• Expiry date: Mar 6, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/163
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Microcapsules containing at least one leuco dye, at least one photopolymerisation initiator and at least one photopolymerisable monomer corresponding to the following formula EQU A[--NHCO--X--L.sub.1 --(OCO--CR.sub.1 =CH.sub.2).sub.1 ].sub.m wherein PA0 A stands for a 3- to 6-valent organic group having the following meanings: PA1 a) a saturated hydrocarbon group having 5 to 25 carbon atoms or PA1 b) ##STR1## or c) ##STR2## wherein A.sub.1, A.sub.2, R.sub.3, R.sub.4, o and p have the meanings indicated in the description, PA1 X denotes O or NR.sub.2, PA1 L.sub.1 denotes a divalent or trivalent aliphatic hydrocarbon group whose carbon chain may be interrupted by 1 to 3 oxygen atoms, PA1 R.sub.1 denotes hydrogen or methyl, PA1 R.sub.2 denotes hydrogen or C.sub.1 -C.sub.4 -alkyl, PA1 l denotes 1 or 2 and PA1 m denotes a number from 3 to 6, are distinguished by improved sensitivity.