Detergent compositions in compacted solid form

Details Detergent compositions in compacted solid form Detergent compositions in compacted solid form

1998-07-31

2000-05-16

Liott, Caroline D.

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

For cleaning a specific substrate or removing a specific...

510228, 510230, 510298, 510349, 510361, 510441, 510446, 510469, 510475, 510509, 510511, C11D 736, C11D 712, C11D 714

Patent

active

060637471

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to detergent compositions in compacted solid form containing an alkalinity system and a crystal growth inhibitor.


BACKGROUND OF THE INVENTION

Detergent compositions for use in automatic dishwashing or laundry machines are often in granular or powder form. Such compositions are measured and dosed by the consumer and placed in the dispenser of the machine which is located in the door in the case of dishwashing machines or the dispensing tray of an automatic laundry washing machine.
In order to simplify the dosing of detergents for automatic washing machines however, many of the automatic washing detergent compositions are now provided in compacted solid forms, such as bars, tablets or briquettes. This provides a number of advantages to both the consumer and manufacturer. Firstly, such compacted forms allow for easier handling of the detergent composition. Secondly, the compacted solids are generally sized to meet dosage requirements. Thirdly, the use of compacted solid forms minimizes the contact by the consumer with the composition.
It is highly desirable that the compacted solid forms possess a certain degree of hardness and strength. In particular they should be sufficiently hard to meet safety requirements. Detergent compositions are typically highly alkaline and thus oral consumption must be avoided. However, compacted solid forms, particularly tablets often appear attractive to children, who may attempt to consume them. Furthermore, it is also desirable that the compacted solids should be strong enough that they are not susceptible to damage upon packing, transport or storage.
Compacted form detergent compositions for use in laundry and machine dishwashing methods typically contain, for cleaning effectiveness, an alkalinity system. Silicate is an especially common component of such alkalinity systems. In addition to providing cleaning performance, silicate salts have the ability to enhance the hardness and strength of the compacted form products. It is believed that such ability is due to its tendency to form strengthening water bridges between silicate particles. However, it has been established that to achieve the effective formation of the silicate-water bridges, a high proportion of water must be present in the product matrix, which can be undesirable from a product stability standpoint, particularly if the matrix contains components, which are susceptible to hydrolytic degradation on storage (e.g. bleach components).
It has also, been established that the presence of high levels of silicate (typically>12% by weight SiO.sub.2) can potentially lead to problems with the corrosion of glassware in the machine dishwashing load. In view of both product stability and glasscare considerations it is thus preferable to keep the amount of silicate salts below a certain level. It is also however, necessary to maintain a high alkalinity to achieve satisfactory cleaning performance. Partial or full replacement of silicate salts by carbonate salts addresses each of these performance requirements.
The presence of carbonate salts can however give rise to a problem with the formation of white deposits, as spots and films, on the articles in the machine dishwashing load. The strength and hardness of the compacted product can also be reduced when silicate salts are replaced by carbonate salts in a composition.
The Applicant has now found that the white deposits problem can be ameliorated by inclusion of a crystal growth inhibitor compound into the detergent composition. The Application has also found that the strength and hardness of the product, and its capacity to retain the desired physical structure on aging may be increased if at least part of the alkalinity system is made up of particles coated at certain levels with an organic binder material, particularly a polyethylene glycol material. The use of such an organic binder also aids product disintegrability in the wash which assists cleaning performance. Thus, in accord with the invention a product havin

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