Thickened peracid compositions
AssigneeSolvay Interox Limited
InventorsChristopher Revell, Enid Margaret Ellis
Life of this patent
Estimating the term…
Abstract
Thickened aqueous compositions comprising soluble peracids, particularly peracetic acid are provided. The compositions are thickened by the use of one or more aliphatic alcohol ethoxylates having the general formula: R.sup.1 R.sup.2 CH--(OCH.sub.2 CH.sub.2).sub.n --OH in which R.sup.1 and R.sup.2 are each either hydrogen or linear or branched alkyl such that R.sup.1 plus R.sup.2 has a total of from 7 to 22 carbon atoms, and n is selected in the range of 1 to 15, such that the number ratio of carbon atoms in R.sup.1 plus R.sup.2 :n is greater than or equal to 3:1; and a co-surfactant selected from the group consisting of anionic surfactants, amine oxides, amphoteric surfactants and quaternary ammonium compounds.
Claims33
A thickened aqueous composition comprising 0.01 to 40% w/w of a water-soluble peracid in solution together with a thickener wherein the thickener comprises:
- (a) an aliphatic alcohol ethoxylate having the formula:
- R.sup.1 R.sup.2 CH--(OCH.sub.2 CH.sub.2).sub.n --OH
- in which R.sup.1 and R.sup.2 are hydrogen or linear or branched alkyl,
- in which n is an integer of at least 1,
- in which, when neither R.sup.1 nor R.sup.2 is a hydrogen atom, R.sup.1 and R.sup.2 have in total from 10 to 18 carbon atoms, and the number ratio of carbon atoms in R.sup.1 plus R.sup.2 :n is in the range of from 4:1 to 7:1, and
- in which when either R.sup.1 or R.sup.2 is a hydrogen atom, the total number of carbon atoms is from 7 to 16 carbon atoms and the number ratio of carbon atoms in R.sup.1 plus R.sup.2 :n is in the range of from 4:1 to 9:1;
- and
- (b) an amine oxide co-surfactant in an amount sufficient to increase the viscosity of the composition, said ethoxylate (a) being present in an amount of from 2.5 to 15% w/w, said co-surfactant (b) being present in an amount of from 0.1 to 5% w/w, and the weight ratio of said ethoxylate (a) to said co-surfactant (b) being from 2:1 to 20:1.
A process for thickening an aqueous peracid solution, containing from 0.01 to 40% w/w of a water-soluble peracid, said process comprising introducing into said solution:
- (a) an aliphatic alcohol ethoxylate having the formula:
- R.sup.1 R.sup.2 CH--(OCH.sub.2 CH.sub.2).sub.n --OH
- in which R.sup.1 and R.sup.2 are hydrogen or linear or branched alkyl,
- in which n is an integer of at least 1,
- in which, when neither R.sup.1 nor R.sup.2 is a hydrogen atom, R.sup.1 and R.sup.2 have in total from 10 to 18 carbon atoms, and the number ratio of carbon atoms in R.sup.1 plus R.sup.2 :n is in the range of from 4:1 to 7:1, and
- in which when either R.sup.1 or R.sup.2 is a hydrogen atom, the total number of carbon atoms is from 7 to 16 carbon atoms and the number ratio of carbon atoms in R.sup.1 plus R.sup.2 :n is in the range of from 4:1 to 9:1;
- and
- (b) an amine oxide co-surfactant in an amount sufficient to increase the viscosity of the compositions, said ethoxylate being present in an amount of from 2.5 to 15% w/w, said co-surfactant being present in an amount of from 0.1 to 5% w/w, and the weight ratio of said ethoxylate (a) to said co-surfactant (b) being from 2:1 to 20:1.
Dependencies are inferred from the claim text.