Solid peroxo compounds and peroxy compounds stabilized by coatin

Details Solid peroxo compounds and peroxy compounds stabilized by coatin Solid peroxo compounds and peroxy compounds stabilized by coatin

1998-11-18

2000-07-11

Gupta, Yogendra

Compositions

Oxidative bleachant, oxidant containing, or generative

Composition containing a stabilizer or a product in the form...

25218631, 428403, 427220, A01N 300, A62D 300, B32B 516, B05D 700

Patent

active

06086785&

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

The invention relates to the stabilisation of solid peroxo and peroxy compounds, in particular of sodium percarbonate and acetyl peroxyborate compounds by coating with a coating material.
Peroxo and peroxy compounds according to the meaning of the invention consist of inorganic and organic compounds containing active oxygen, which are used in various fields of application, e.g. in detergent compositions or, if necessary, also in disinfectant compositions. Peroxo compounds are consequently inorganic peroxo salts containing active oxygen such as e.g. peroxoborates or percarbonates. Solid peroxy compounds are consequently organic compounds containing active oxygen such as e.g. organic peracids or derivatives liberating these; a particular type of solid peroxy compounds within the framework of the present invention consists of the acetyl peroxyborate compounds which are described below in further detail.
It is well known that peroxo compounds can be used as bleaching compounds in detergent mixtures in powder form. In the usual household heavy-duty detergents, sodium perborate tetrahydrate or sodium perborate monohydrate is usually used as bleaching agent since these materials are relatively stable to decomposition in pure detergent media. With increasing frequency, however, other alkali metal peroxo salts, in particular peroxocarbonate (percarbonate) are also being used. Although these alkali metal peroxo salts, in particular the percarbonate, are stable in the pure, dry state, they have the disadvantage of decomposing easily in the presence of moisture with loss of active oxygen. It is consequently necessary, to protect the alkali metal peroxo salts against moisture from the outside by coating them with a suitable coating. For an effective protection of the alkali metal peroxo salt, care should be taken to ensure that the coating is as complete as possible. Apart from the coating and the protective function, the coating materials used should also be able to take on additional functions in ready-to-use compositions containing the coated alkali metal peroxo salt.
Acetyl peroxyborate compounds are solid compounds containing active oxygen, which are based on acetic acid and boron oxygen compounds and known from DE 41 36 172. These compounds, hereinafter referred to as acetyl peroxyborates, are characterised by their content of peracetic acid which can be liberated in water, instantaneously and directly. Peracetic acid is characterised in comparison with purely inorganic percompounds by its low active temperature and high bleaching and disinfectant power. Peracetic acid is safe for the environment and characterised by a good water solubility. However, one of the disadvantages of peracetic acid consists in that it is liquid at room temperature and, moreover, can be produced only as a solution of peracetic acid in acetic acid but not in the pure state. This restricts the possibilities for using the peracetic acid. Acetyl peroxyborates overcome this disadvantage. They are colourless solid compounds which, as such, have an advantageous active oxygen stability at normal temperatures and, are chemically and physically non-critical during storage and handling. However, acetyl peroxyborates have the disadvantage of exhibiting a relatively low storage stability in contact with the usual basic detergent components and of tending towards premature decomposition with liberation of peracetic acid and consequently loss of active oxygen content. It is therefore necessary to protect the acetyl peroxyborate compounds in the same way as the alkali metal peroxo salts with a suitable coating against moisture.
It is the task of the present invention to provide a coating process for solid peroxo and peroxy compounds, in particular however for sodium percarbonate and acetyl peroxyborates, by means of which their stability in storage is improved in the presence of detergent powder components.
It has now been found that stabilisation of solid peroxo and peroxy compounds, in particular of sodium percarbonate and the acetyl per

REFERENCES:
patent: 5332518 (1994-07-01), Kuroda et al.
patent: 5407685 (1995-04-01), Malchesky et al.
patent: 5462692 (1995-10-01), Roesler et al.
patent: 5505875 (1996-04-01), Beaujean et al.
patent: 5902682 (1999-05-01), Bertsch-Frank et al.

Affiliated with

Also associated with

Rating

Solid peroxo compounds and peroxy compounds stabilized by coatin does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Solid peroxo compounds and peroxy compounds stabilized by coatin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid peroxo compounds and peroxy compounds stabilized by coatin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-538603