Patent number: 5346806
Abstract: Ligomeric sulfonic acid derivatives having repeating units of the formula I ##STR1## in which R.sup.1 is an alkyl, haloalkyl or aryl radical,R.sup.2 is a hydrogen atom, an alkyl, alkenyl or aryl radical or the group (R.sup.1 --SO.sub.2 --O--).sub.n X--,R.sup.3 is a cycloalkylenedialkyl, cycloalkenylenedialkyl, arylenedialkyl, heteroarylenedialkyl group, alkylene, alkenylene, alkynylene, cycloalkylene or arylene group,X is an alkylene, cycloalkylene or arylene group Y is O, S, CO, CO--O, SO.sub.2, SO.sub.2 --O, NR.sup.4, CO--NH, O--CO--NR.sup.5, NH--CO--NR.sup.5 or NR.sup.5 --CO--O,Z is O, CO--NR.sup.6, O--CO--NR.sup.6 or NH--CO--NR.sup.6,R.sup.4 is an acyl radical,R.sup.5 is a hydrogen atom or an alkyl-, cycloalkyl, alkenyl, alkynyl or aryl radical,R.sup.6 is an alkyl, cycloalkyl, alkenyl, alkynyl or aryl radical,k is 0, 1, 2, 3 or 4,m is an integer greater than 1 andn is 1, 2 or 3,generate sulfonic acids under irradiation and are cleavable by the latter.
Type:
Grant
Filed:
April 20, 1992
Date of Patent:
September 13, 1994
Assignee:
Hoechst Aktiengesellschaft
Inventors:
Georg Pawlowski, Ralph Dammel, Horst Roeschert, Walter Spiess, Charlotte Eckes