Abstract: Fluxes for aluminium brazing or welding may be produced by grinding the slag by-product of aluminium boron master alloy production. The grinding is preferably to below 75 microns size but particularly preferably to below 30 microns size. The fluxes may be mixed into water to produce a stable, mobile slurry which may be spray-applied to an aluminium work-piece.

Abstract: In the present invention, hydrated magnesium salts of the carboxylate group in certain aromatic or olefinically unsaturated peroxyacids such as monoperoxyphthalic acid or monoperoxymaleic acid are made by reacting the corresponding anhydride with aqueous hydrogen peroxide and a magnesium base, in the absence of a significant amount of free iron. By so doing, the process avoids the use of non-aqueous solvents such as ethyl acetate. Solid product can be obtained by using no more than enough hydrogen peroxide and water for solely a damp product to be obtained or by crystallization from an aqueous solution, preferably with recycle of the mother liquor. Preferably the reaction temperature is maintained at 5.degree. to 25.degree. C., employing 1.8 to 2.2 moles anhyhdride per mole of magnesium base, and 0.95 to 1.2 moles of hydrogen peroxide per mole of anhydride.The product can be used as a bleach and as a disinfectant.

Abstract: Increased energy costs have stimulated a demand for peroxygen compounds that are effective at ambient to hand-hot temperatures, but peroxyacids and acyl peroxides tend to suffer from one or more of poor thermal stability, or sensitivity to impact, thereby rendering their manufacture or storage hazardous, or from poor solubility. The instant invention provides a salt of the formula (in anhydrous form): ##STR1## The salt can be incorporated in low temperature bleaching compositions, in washing compositions, in sanitizing compositions or in disinfection/sterilization compositions.

Abstract: The present invention relates to the provision in solid form of the magnesium salt of certain aromatic, cycloaliphatic or conjugated aliphatic compounds containing a peroxycarboxylic acid group and a carboxylate group, and optionally also an alkyl, carboxylate, sulphonate, nitro, chloro or bromo group, which can be employed as bleaching agents. One especially referred example is magnesium monoperoxyphthalate having the formula: ##STR1## The invention also provides processes for the preparation of the salts, by reaction between a magnesium compound and the organic peroxyacid/carboxylate compound in a solvent from which the salt precipitates, the latter preferably being obtained by reaction between hydrogen peroxide and the corresponding anhydride under controlled reaction conditions of temperature and reagent ratios.

Abstract: The present invention relates to the provision in solid form of the magnesium salt of certain aromatic, cycloaliphatic or conjugated aliphatic compounds containing a peroxycarboxylic acid group and a carboxylate group, and optionally also an alkyl, carboxylate, sulphonate, nitro, chloro or bromo group, which can be employed as bleaching agents. One especially referred example is magnesium monoperoxyphthalate having the formula: ##STR1## The invention also provides processes for the preparation of the salts, by reaction between a magnesium compound and the organic peroxyacid/carboxylate compound in a solvent from which the salt precipitates, the latter preferably being obtained by reaction between hydrogen peroxide and the corresponding anhydride under controlled reaction conditions of temperature and reagent ratios.