| 摘要 |
Stable, novel and highly effective peroxyhydrates of condensed phosphates, in particular tetrasodium pyrophosphate tris peroxyhydrates are provided. Said peroxyhydrates may be further stabilised by treatment thereof with an acidic gas or vapour and/or by encapsulation of granules containing the peroxyhydrate with suitable encapsulants including film forming polymers and oils. Additionally, a pH modifier, such as an acid buffer or acid releasing agent may be added to said granules to protect them from excessively alkaline environments as found in most washing powders. The peroxyhydrates provided, are effective oxidising bleaches finding particular application in detergent formulations. Detergent compositions, especially laundry detergent and dishwashing powder compositions containing the peroxyhydrate, are also provided. |
