Particulate bleaching composition comprising enzymes

1. A particulate bleaching composition comprising, based on total composition weight:

a) from about 5% to about 80% of an oxygen bleach;

b) from about 0.01% to about 20% of a surfactant;

c) and from about 0.00005% to about 0.3% of an enzyme wherein said enzyme:

i. exhibits endo-beta-1,4-glucanase activity (E.C. 3.2.1.4); and

ii. exhibits greater than 80% of maximum activity at pH 9.2 when measured at 40° C.; and

iii. does not comprise a Class A Carbohydrate Binding Module (CBM); wherein the weight ratio of available oxygen (AvO) to surfactant is greater than 0.45.

2. The composition according to claim 1 wherein the enzyme is a bacterial alkaline enzyme exhibiting endo-beta-1,4-glucanase activity (E.C. 3.2.1.4).

3. The composition according to claim 2 wherein the enzyme is a bacterial polypeptide endogenous to a member of the genus Bacillus.

4. The composition according to claim 2 wherein the enzyme is a polypeptide containing (i) at least one family 17 carbohydrate binding module and/or (ii) at least one family 28 carbohydrate binding module.

5. The composition according to claim 2 wherein the enzyme is selected from the group consisting of:

(i) an endoglucanase having the amino acid sequence of positions 1 to position 773 of SEQ ID NO:1;

(ii) an endoglucanase having at least 90% sequence identity to the amino acid sequence of position 1 to position 773 of SEQ ID NO:1; or a fragment thereof that has endo-beta-1,4-glucanase activity, when identity is determined by GAP provided in the GCG program using a GAP creation penalty of 3.0 and GAP extension penalty of 0.1; and

(iii) mixtures thereof.

6. The composition according to claim 1 wherein said composition comprises from about 0.00005% to about 0.15% by weight of pure enzyme.

7. The composition according to claim 1 comprising, based on total composition weight, from about 10% to about 80% oxygen bleach.

8. The composition according to claim 1 wherein said oxygen bleach comprises a peroxygen source.

9. The composition according to claim 8 wherein said peroxygen source comprises an alkali metal salt of percarbonate.

10. The composition according to claim 9 wherein said alkali metal salt of percarbonate comprises sodium percarbonate.

11. The composition according to claim 1 wherein said surfactant system comprises a material selected from the group consisting of selected from a non-ionic surfactant, an anionic surfactant, a zwitterionic surfactant, a cationic surfactant, an amphoteric surfactant and mixtures thereof.

12. The composition according to claim 1 wherein said surfactant comprises an acyl sarcosinate surfactant.

13. The composition according to claim 1 further comprising, based on total composition weight, up to 30% of a bleach activator.

14. The composition according to claim 13 wherein said bleach activator has the formula:

wherein R is a linear or branched alkyl chain, comprising from 1 to 11 carbon atoms.