Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1998-01-08
2001-09-25
DelCotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S193000, C510S238000, C510S379000, C510S381000, C510S446000, C510S447000, C252S186340, C252S186350, C252S187100, C252S187340
Reexamination Certificate
active
06294510
ABSTRACT:
This invention is concerned with improvements in and relating to lavatory cleansing.
In particular, the present invention is concerned with solid lavatory cleansing compositions intended to be brought into contact with the flush water of a lavatory or urinal whereby a part of the composition is dissolved in the flush water to release active ingredients thereto for cleaning the lavatory or urinal. The compositions are immersed in the water cistern of a lavatory or urinal, either as free-standing blocks or may be placed or contained in a dispensing device, to be sited in a lavatory cistern. The invention is also concerned with lavatory cleansing compositions for intermittent contact with the flush water of a lavatory or urinal, e.g., a so-called “rim block” for placing in a container to be held under the rim of a lavatory, or else on top of a tank or cistern wash hand basin such as is common in Japan.
A desirable component of such blocks is a halogen release agent, that is a compound which on contact with water releases hypohalous acid and/or hypohalite ions to the water, since these are powerful sanitising and cleansing agents.
However, such components are highly reactive and hence may be difficult or even dangerous to incorporate in lavatory cleansing blocks. This is especially the case with the more highly reactive halogen release agents such as the halogenated hydantoins, halogenated glycolurils or trichloro-isocyanuric acid. These more highly active halogen-release components may be characterised by their halogen content, typically having an active halogen content of 30 mole %, or higher.
In particular, WO 92/18605 discloses a solid lavatory cleansing block comprising one or more anionic surfactants, a halogen release agent component and a solubility control agent. However, this does not teach how to form a stable block based on a halogen release component having an active halogen content of at least 30 mole %. Examples of blocks which contain such high halogen levels (i.e. DCDMH and BCDMH) are described in EP-A-0 206 725. However, in practice it is not possible to achieve a sufficient degree of stability for commercial use with these particular formulations.
Two-part lavatory blocks in which the bleach and bleach sensitive components are kept in separate parts are disclosed in EP-A-055 100 and EP-A-101 402. DCDMH is recited as an optional bleach component in both documents.
The use of certain solubility retardants in combination with bleaches (which are not those containing at least 30 mole % of active halogen) are disclosed in WO 92/18605 and GB-A-2 273 106.
It has now been found, in accordance with the present invention, that halogen-release agents may readily be incorporated in certain lavatory cleansing compositions, as hereinafter defined.
According to the invention, therefore, there is provided a solid lavatory cleansing composition comprising:
(i) a halogen-release agent, containing at least 30 mole % active halogen;
(ii) a substantially anhydrous surfactant component; and
(iii) a solubility retardant agent;
wherein components (ii) and (iii) are substantially non-oxidisable.
Thus, a particular non-limiting embodiment of the invention provides a solid lavatory cleansing block formed of a composition comprising (A) from 1 to 80%, preferably from 20 to 60%, by weight of the surface active component comprising one or more substantially anhydrous, substantially non-oxidizable anionic surface active agents; (B) from 1 to 90%, preferably from 1 to 50%, e.g. 1 to 30% by weight of halogen-release agent; and (C) from 1 to 50%, preferably from 1 to 30%, by weight of a substantially non-oxidizable solubility control agent (as hereinafter defined).
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McCutcheon's Emulsifier's and Detergents, International Edition, The Manufacturing Confectioner Publishing Co., 1985, p. 93. TP990D4, 1985 No month available.
Marshall John
Norman Russell
Wilson Brain Murie
Delcotto Gregory
Harness & Dickey & Pierce P.L.C.
Jeyes Group Limited
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