C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
8/87, 134/5.3
C11D 7/54 (2006.01) C11D 3/39 (2006.01)
Patent
CA 1135907
ABSTRACT A process for preparing peroxide-based bleach media and concentrated bleach compositons for use in carrying out the process, the process comprising incorporating in an aqueous medium a peroxide-based bleach and an activator therefor. In order to provide a bleach medium which is effective at temperatures at which home laundering is conventionally carried out the activator so incorporated is a cyanoamino and the medium is maintained alkaline, if necessary by the incorporation of a buffering agent. The cyanoaminos are those of equivalent weight 44 to 600 which have the molecular formula: Image , in which R1 and R2 represent hydrogen or Group 1A metal atoms (with certain provisos) or certain hydrocarbyl, alkanoyl, ethoxylate, or proproxylate, cyanoamino or poly- alkenylamino groups or in which R1 and R2 taken together with the amino nitrogen atom to which they are attached form either (a) a 4 to 6 carbon atom-containing ring of 5 to 7 atoms which contains hetero atoms selected from O, S and N-R3, in which R3 can be a hydrogen atom or certain hydrocarbyl, alkanoyl or cyano groups or another hetero- cyclic ring of 5 to 7 atoms, and which defined substi- tuents may optionally be present in one or more of the heterocyclic ring carbon atoms. The bleach and the activator can be incorporated in the aqueous medium separately or in the form of a liquid or solid concentrated bleach composition.
331580
Shell Canada Limited
Smart & Biggar
LandOfFree
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