Improved stabilization of peroxide systems in the presence of alkaline earth metal ions

Claim 2

An inhibited aqueous hydrogen peroxide composition characterised in that, it comprises as inhibitor the combination of: (a) an aminophosphonic acid chelant or an ammonium, alkali metal or amine salt therof, and (b) at least one polymer of (1) an unsaturated carboxylic acid or an ammonium alkali metal or amine salt thereof, (2) an unsaturated carboxylic amide, or (3) an unsaturated carboxylic amide wherein at least one amide hydrogen is substituted by an alkylsulfonic acid group or an ammonium, alkali metal or amine salt thereof, and wherein the (b) additive may contain a combination of said functional groups.

Claim 3

An aqueous hydrogen peroxide composition containing 5 to 70 weight percent hydrogen peroxide inhibited against decomposition and suitable for adding to a bleaching bath useful in bleaching cellulosic products characterised in that, it comprises as inhibitor (a) from 2.5 to 0.025 percent of an aminophosphonic acid chelant or an ammonium, alkali metal or amine salt thereof, and (b) at least one polymer of (1) an unsaturated carboxylic acid or an ammonium, alkali metal or amine salt thereof, (2) an unsaturated carboxylic amide, or (3) an unsaturated carboxylic amide wherein at least one of the amide hydrogens is substituted by an alkylsulfonic acid group or an ammonium, alkali metal or amine salt thereof and wherein the (b) additive may contain a combination of said functional groups.

Claim 4

An aqueous hydrogen peroxide composition containing 5 to 70 weight percent hydrogen peroxide inhibited against decomposition and suitable for adding to a bleaching bath useful in bleaching cellulosic products characterised in that, it comprises as inhibitor (a) from 2.5 to 0.025 percent of an aminophosphonic acid chelant or an ammonium, alkali metal or amine salt thereof, and (b) at least one polymer of (1) an unsaturated carboxylic acid or an ammonium, alkali metal or amine salt thereof, (2) an unsaturated carboxylic amide, or (3) an unsaturated carboxylic amide wherein at least one of the amide hydrogens is substituted by an alkylsulfonic acid group or an ammonium, alkali metal or amine salt thereof and wherein the (b) additive may contain a combination of said functional groups.

Claim 5

A composition as claimed in Claim 1 or Claim 2, wherein the aminophosphonic chelant has the Formula I wherein: M is independently H, an alkali metal, NH 4 , or an amine radical; R 1 is an aliphatic straight or branched chain, cyclic or aromatic radical having from 2 to 6 carbon atoms; n is 0 to 12; and m is 1 to 3.

Claim 6

A composition as claimed in Claim 3, wherein R l is ethylene, m is 1 and n is 0.

Claim 7

A composition as claimed in Claim 3, wherein R 1 is ethylene, m is 1 and n is 2.

Claim 8

A composition as claimed in Claim 3, wherein R 1 is ethylene, m is 1 and n is 3.

Claim 9

A composition as claimed in any one of the preceding claims, wherein the polymer has the Formula II wherein: A is independently hydrogen or methyl; Z is independently NH 2 or OM, where M is independently hydrogen, an alkali metal, ammonium or an amine radical; and p is from 13 to 5,500; or the Formula III wherein: R 2 is an alkylene radical having 1 to 6 carbon atoms; and p' is from 5 to 2,000; and A and M are defined as above; and mixtures of said polymers.

Claim 10

A composition as claimed in Claim 7, wherein the polymer is a polycarboxylic acid of Formula II in which p is an integer of from 25 to 250.

Claim 11

A composition as claimed in Claim 7, wherein the polymer is a polycarboxylic sulfonamide of Formula III in which R 2 is an alkylene radical having 4 carbon atoms and p' is an integer of from 10 to 350.

Claim 12

A composition as claimed in any one of the preceding claims, wherein the weight ratio of additives is from 0.05 to 5.3 parts of aminophosphonic acid chelant to one part of polymer.

Claim 13

A composition as claimed in any one of Claims 1 and 3 to 10, wherein the weight percent of aminophosphonic acid chelant is from 0.1 to 1.0 and of polymer is from 0.19 to 1.9.

Claim 15

The use as a stabilizer for hydrogen peroxide in a aqueous solution of a combination of aminophosphonic chelant and polymer as defined in any one of Claims 1 to 11.

Claim 16

A process for bleaching a cellulosic material with an inhibited aqueous hydrogen peroxide composition characterised in that, said composition comprises as inhibitor, a combination of aminophosphonic acid chelant and polymer as defined in any one of Claims 1 to 11.