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Quaternary-ammonium phenylsulfonylacetate thermal-dye-bleach agents
U.S. Patent Number: 5384237
Abstract: A thermal-dye-bleach construction comprising a dye in association with a thermal dye-bleaching agent of general formula I: ##STR1## wherein: each of R.sup.a and R.sup.b are individually selected from: hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic group, and preferably, both R.sup.a and R.sup.b represent hydrogen; p is one or two, and when p is one, Z is a monovalent group selected from: an akyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group, and a heterocyclic group, and when p is two, Z is a divalent group selected from: an alkylene group, an arylene group, an alkenylene group, an alkynylene group, an aralkylene group, a cycloalkene group, and a heterocyclic group; and, M.sup.+ is a cation which will not react with a carbanion generated from the thermal-carbanion-generating agent in such manner as to render the carbanion ineffective as a bleaching agent for the dye.
Inventors: Stevenson; Dian E. (Saffron Walden, GB2), Kirk; Mark P. (Stortford, GB2), Farnum; Sylvia A. (Lakeland, MN), Frank; William C. (Roseville, MN), Helland; Randall H. (Maplewood, MN), Kitchin; Jonathan P., (White Bear Lake, MN), Mader; Roger A. (Stillwater, MN), Mizen; Mark B. (St. Paul, MN), Newmark; Richard A. (St. Paul, MN), Ramsden; William D. (Afton, MN), Sakizadeh; Kumars (Woodbury, MN), Spawn; Terence D. (Maplewood, MN), Tiers; George V. (St. Paul, MN)
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Application Number: 08/187,171
Issued: 1995-01-24
Expired: 2007-01-24
Classes: 430/566 ; 252/583; 252/587; 430/203; 430/339; 430/351; 430/510; 430/517; 430/522; 430/559; 430/617; 430/944; 430/955; 430/964
Field of search: 430/510,203,351,617,559,517,955,517,339,944,964,522,566 252/583,587
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