Minnesota Mining and Manufacturing Company

Richard A Newmark

Kumars Sakizadeh

George V Tiers

William Donald Ramsden

Roger A Mader

Terence D Spawn

Mark P Kirk

Dian E Stevenson

Randall H Helland

Mark B Mizen

Sylvia A Farnum

Jonathan P Kitchin

William C Frank

Jonathan P, Kitchin

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;

Quaternary-ammonium phenylsulfonylacetate thermal-dye-bleach agents

Tetra-alkylammonium phenylsulfonylacetate thermal-dye-bleach agents

A thermal-dye-bleach construction comprising a polymethine dye having a nucleus of general formula I: ##STR1## in association with a thermal-carbanion-generating agent having the general formula: ##STR2## wherein the substituents are as defined in the specification and claims.

Thermal-dye-bleach construction comprising a polymethine dye and a

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Saint Paul, MN, United States of America

Richard A Newmark