DETAILED DESCRIPTION We claim: 1.
A method for preparing a free-flowing detergent powder comprising: (i) selecting sodium perborate monohydrate having physical characteristics of specific surface area (SA in m.
sup.
2 /g) and pore volume (PV in cm.
sup.
3 /g) such that the formula (SA+31.
25 PV-16.
25) is greater than zero; and (ii) combining from 5 to 50% by weight of said sodium perborate monohydrate, from 4 to 50% by weight of a detergent-active material selected from the group consisting of soap, synthetic anionic, nonionic, amphoteric, zwitterionic and cationic detergent-active materials and mixtures thereof, and from 5 to 80% by weight of a detergency builder.
2.
A method for preparing a detergent powder composition according to claim 1, wherein said formula is greater than 1.
3.
A method for preparing a detergent powder composition according to claim 1, wherein said perborate monohydrate has a pore volume greater than 0.
2 cm.
sup.
3 /gram.
4.
A method for preparing a detergent powder composition according to claim 1, wherein said perborate monohydrate has a specific surface area of more than 5 m.
sup.
2 /gram.
5.
A method for preparing a detergent powder composition according to claim 4, wherein said specific surface area is greater than 7 m.
sup.
2 /gram.
6.
A method for preparing a detergent powder composition according to claim 1, which is free from sodium tripolyphosphate builder.
7.
A method for preparing a detergent powder composition according to claim 1, which has a phosphorus content of not more than 6% by weight.
8.
A method for preparing a detergent powder composition according to claim 7, which contains a detergency builder system comprising sodium tripolyphosphate together with another builder selected from the group consisting of alkali metal nitrilotriacetates, alkali metal orthophosphates, alkali metal pyrophosphates, alkali metal carbonates, sodium aluminosilicates and mixtures thereof.
9.
A method for preparing a detergent powder composition according to claim 7, which contains a detergency builder selected from the group consisting of alkali metal carbonates, sodium aluminosilicates, nitrilotriacetates and mixtures thereof
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