Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1996-05-24
1999-03-16
Fries, Kery
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
510292, 510300, 510360, 510397, 510500, 510505, 510475, 510476, 510477, 510530, 510392, C11D 3386, C11D 337
Patent
active
058830642
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to compact granular detergent compositions containing a protease having an isoelectric point below 10.
More in particular, the present invention relates to compact granular dye transfer inhibiting compositions comprising a polymeric dye transfer inhibiting agent and a protease having an isoelectric point below 10, said compositions further comprising a surfactant system which is free of alkylbenzene sulfonate.
BACKGROUND OF THE INVENTION
Currently, there is a high interest in "compact" detergent products. The particularity of such detergent compositions is their relatively high density compared to conventional detergent compositions, and their ability to achieve the same efficiency as conventional detergent compositions by using a considerably lesser amount of "compact" detergent composition. This particularity is best reflected, in terms of composition, by a relatively low amount of inorganic filler salt. The efficiency of such "compact" detergent composition is best achieved by eliminating the pre-wash cycle and by using dispersing and diffusing devices, which are put directly in the drum of the washing machine at the start of the main washing cycle.
Detergent compositions containing proteases are well-known in art. By using a protease in a detergent, it is possible to hydrolyze the proteins, present in stains and soil on the clothes, to such a degree that they become readily soluble in water.
It is equally well recognized that the relative ability of each protease to meet various performance criteria depends at least in part on the composition of the detergent matrix. As a consequence, the detergent formulator is faced with a difficult task of providing compact detergent compositions containing a protease, wherein said protease has an excellent detergency performance.
The present invention is based on the unexpected finding that in a "compact" matrix containing a polymeric dye transfer inhibiting agent and a non-alkylbenzene sulfonate surfactant system, the detergency performance of a protease having an isoelectric point below 10 outperforms other proteases having an isoelectric point of higher than 10 such as Savinase.RTM., Opticlean.RTM., Maxacal.RTM., Purafect.RTM., and Esperase.RTM..
This finding allows formulation of compact granular detergent compositions providing both excellent cleaning and fabric care properties on cotton and woollen fabrics.
According to another embodiment of this invention a process is also provided for laundering operations involving colored fabrics.
SUMMARY OF THE INVENTION
The present invention relates to compact granular detergent composition comprising a polymeric dye transfer inhibiting agent and a protease having an isoelectric point below 10, said composition further comprising a surfactant system free of alkylbenzene sulfonate.
DETAILED DESCRIPTION OF THE INVENTION
The present detergent compositions are in granular form and are characterized by their density, which is higher than the density of conventional detergent compositions.
The density of the compositions herein ranges from 550 to 950 g/liter, preferably 600 to 900 g/liter of composition, measured at 20.degree. C.
The "compact" form of the compositions herein is best reflected, in terms of composition, by the amount of inorganic filler salt; inorganic filler salts are conventional ingredients of detergent compositions in powder form; in conventional detergent compositions, the filler salts are present in substantial amounts, typically 17-35% by weight of the total composition.
In the present compositions, the filler salt is present in amounts not exceeding 15% of the total composition, preferably not exceeding 10%, most preferably not exceeding 5% by weight of the composition.
Inorganic filler salts, such as meant in the present compositions are selected from the alkali and alkaline-earth-metal salts of sulphates and chlorides.
A preferred filler salt is sodium sulphate.
Protease
The compact detergent compositions according to the present invent
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Baeck Andre Cesar
Busch Alfred
Verschuere Ann Katrien Marie
Fries Kery
Goodrich D Mitchell
Patel Ken K.
Rasser J. C.
The Procter & Gamble & Company
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