Field of the invention:
The present invention generally relates to pourable dishwash detergents with enhanced
cleaning power, particularly against dried-on and burnt-on soil. The present invention
provides a stable chemical composition for good cleaning performance on hard surfaces,
which comprises high level of surfactants and abrasive loading and having good pourable
consistency. Said pourable dishwash detergent composition for enhanced cleaning comprises
of surfactant mixture and suspended abrasive particles, stabilized with polymer rheology
modifier.
Background and Object of the Invention
Conventional dishwashing compositions, generally in the form of pastes are liquid or gel, are
suitable for forming hardened dishwashing agents that have a similar look and feel to that of a
bar of soap. Once the pastes are formed, their chemistry allows them to harden to a desired
hardness level for packaging and sale to customers.
Dishwashing paste compositions are typically formed of a high amount of abrasive/filler
material, Such as calcium carbonate, that is suspended in a viscous solution which includes
surfactant(s), sodium carbonate, and sodium silicate, as well as other additives. The sodium
silicate is the primary component structuring component that allows the dishwashing
composition to harden by providing silica that polymerizes when mixed with the other
components. The surfactants provide the foaming and cleansing properties of the dish
washing agent, while the abrasive particles provide aid to cleansing property. Sodium
carbonate helps to adjust the pH level of the formula. The conventional dishwash paste
products do not flow easily due to the hardening of the product with structuring agents.
However, it is desired that product has good pourability as it’s convenient to use.US 2017/0183608 A1 provides dishwash paste comprising abrasives, pH modifying agent,
silicate based structuring agent and a source of polyvalent cation. Invention discloses the
achieving of target hardness more quickly, while maintaining that hardness for an extended
period of time. The developed hardness causes the restriction in ease flow of the product.
US 4941988 discloses pourable liquid automatic dishwashing detergent compositions having
polyacrylate polymer thickener, an alkali metal silico-aluminate colloid, surfactants, chlorine
bleach ingredients and builders. The alkali metal silico-aluminate is used as structuring agent.
The compositions have low viscosities however the disclosed maximum surfactant level is
only 5% and invention does not mention the application of abrasive particles.
US 2005/0176614 A1 discloses a substantially transparent, liquid cleaning product for hard
surfaces, comprising at least 15% by weight of a surfactant and one or more
polymeric/natural abrasive materials selected from the group having a diameter from 0.6 to 4
mm, natural materials having a diameter of from 0.05 to 4 mm, and mixtures thereof. The
viscosity of the product is controlled in the range of 2.5 Pa.s to 100 Pa.s, which makes it
flowable. However, said prior art does not claim the liquid cleaning composition with
inorganic abrasive material.
US006001791A discloses the invention to provide a detergent for institutional dishwashing
machines with the consistency of a paste without the need of thickeners or extenders. Alkalimetal tripolyphosphate, alkali-metal hydroxide, carbonate, or metasilicate were used as
structuring agents. Invention discloses paste viscosity of 50-800 Pas. However, said prior art
does not talk about the abrasive nature of particles in its paste-like detergent.
US4968445 discloses stable and thixotropic aqueous liquid automatic dishwashing detergent
composition with improved anti-filming properties. Said detergent composition comprises
silica anti-filming particles, inorganic builder salts, chlorine bleach, bleach stable detergent and a thixotropic thickener. Products having high particles loading (more than 5%) are not
disclosed in the invention.
Another prior art WO 00/36078 provides pourable liquid products for textiles in which
encapsulated active ingredients are suspended with the aid of polymeric thickeners. These
active ingredients are enzymes, bleaches, per fumes, etc. which are to be incorporated stably
in the liquid product. Suspended active ingredients are not envisaged as abrasive.
Another patent application WO02/38720 describes pourable clear surfactant-containing
cleaning gels comprising macroscopic abrasive particles. Such particles may be inorganic
substances, or else polymer granules or hard waxes. The surfactant content is between 0.1
and 15%. The gels are used to clean hard Surfaces. However the said art does not disclose
any technical fact relating to possibility of having particles size less than 500 micron in its
cleaning gel composition.
The German application DE-A 19918267 describes manual dishwashing liquids, in which
microcapsules comprising various active ingredients are suspended. An abrasive action of
these suspended particles is not envisaged here either, but rather the shell of the
microcapsules opens on use and releases the active ingredient present.
Therefore, in the conventional practice, those manual dishwashing composition and other
cleaning products for hard surfaces, which exhibit high surfactant and abrasive loading in
order to achieve good cleaning performance, fail to achieve good pourable consistency of
product and no such dishwashing compositions detergent is known in the art which, without
compromising with the good cleaning performance, simultaneously involves high surfactant
load, high abrasive load and high degree of pourability.
It is not at all obvious for a person skilled in the art having common general knowledge of the
concerned field, to achieving a stable pourable liquid cleaning composition with higher
surfactant (preferably more than 5%, more preferably more than 10%) and abrasive materialloading (preferably more than 5%, more preferably more than 10%) and viscosity value at
ambient temperature (25 °C) in the range of 1 Pa.s to 50 Pa.s, preferably 2 Pa.s to 25 Pa.s and
more preferably 5 Pa.s to 10 Pa.s.; particularly because of substantial inventive steps involved
in preparation and optimization of such pourable and stable aqueous liquid cleaning.
Therefore, the prime object of the present invention to provide a cleaning product for hard
surfaces which comprises a high level of surfactants and abrasive loading, has good cleaning
performance and is additionally has good pourable consistency.
Another object of the present invention is to provide such a pourable and stable aqueous
liquid dish washing detergent composition, which comprises high proportion of surfactant up
to 25 wt.%; high proportion of insoluble abrasive material, up to 30 wt% having mean
particle size below 100 microns; polymeric rheology modifying agent up to 10% proportion
thereof ; up to 10% of mono or polyvalent cation(s) and wherein said pourable and stable
aqueous liquid cleaning composition shows high viscosity value up to 50 Pa.s., depending
upon the composition thereof.
Another object of the present invention is to provide a pourable and stable aqueous liquid
dish washing detergent composition which comprises up to 25% of a detergent surfactant;
from about 1wt.% to about 30 wt.% of water insoluble abrasive having mean particle size in
the range of 0.1 to 100 microns; from about 0.25% to about 10% of a polycarboxylate
polymer rheology modifying agent having molecular weight greater than 100000 Da; from
0% to 10% of a source of mono or polyvalent cation; and wherein the said pourable and
stable aqueous liquid dish washing detergent composition has viscosity value at ambient
temperature (25 °C) in the range of 1 Pa.s to 50 Pa.s, preferably 2 Pa.s to 25 Pa.s and more
preferably 5 Pa.s to 10 Pa.s.
Another object of the present invention is to provide a pourable and stable aqueous liquid
dish washing detergent composition, wherein the detergent surfactant is selected from at least one of the followings: alkyl benzene sulfonates (LABS), Linear alkyl benzene sulfonic acid
(LABSA), sodium lauryl ether sulfate (SLES), sodium dodecyl sulfate (SDS), sodium
palmityl sulfate, sodium octadecyl sulphate, sodium octyl sulphate, water-soluble alkyl
sulfates, ether sulfates, and alcohol ethoxylates, alkyl polyglucosides (APGs), s αsulfomethyl esters, ethoxylated amines, Alkyl amineoxides, Alkylamidoalkyl amineoxide,
alkanolamides, betaines, alkyldiphenyl, oxide disulfonates, linear alkyl benzene sulfonate
(LAS), potassium lauryl alkyl sulfate, sodium palmityl alkyl sulfate, sodium myristyl alkyl
sulfate, potassium palmityl alkyl sulfate, potassium decyl sulfate, sodium coconut alkyl
sulfate, potassium coconut alkyl sulfate, potassium myristyl alkyl sulfate, magnesium
dodecyl sulfate, magnesium C12-15 alkyl sulphate etc.

I/We Claim:

1. Pourable dishwash detergent with suspended abrasive particles for enhanced cleaning,
wherein said dishwash detergent comprises surfactant load up to 25 wt.%; water insoluble
abrasive material up to 30 wt% having mean particle size below 100 microns; polymeric
rheology modifying agent up to 10% proportion thereof; up to 10% of mono or polyvalent
cation(s) and wherein said pourable and stable aqueous liquid dishwash detergent
composition characterized in viscosity value at ambient condition (25 °C) up to 50 Pa.s.,
stability and cleaning performance.
2. The pourable dishwash detergent, as claimed in claim 1, wherein the most preferred
embodiment of the said pourable and stable aqueous liquid dish washing detergent
composition comprises: up to 25% of a detergent surfactant mixture;
• from about 1wt.% to about 30 wt.% of water insoluble abrasive having mean
particle size in the range of 0.1 to 100 microns;
• from about 0.25% to about 10% of a polycarboxylate polymer rheology
modifying agent or a cellulose based rheology modifier, having molecular
weight greater than 100000 Da.;
• from 0% to 10% of source of mono or polyvalent cation, selected from at least
one salt of a mono or polyvalent inorganic cation and a mono/polyvalent
inorganic anion or a mono/polyvalent organic anion of a small
monocarboxylic acid;
• at least one pH modifying Agents to achieve overall pH of the detergent
composition in the range of 5-12; and
at least one additive, selected from perfume, enzyme, chelator, builder,
preservative and hydrotrope/solvents
22
and wherein the said pourable and stable aqueous liquid dish washing detergent
composition has viscosity value at ambient condition (25°C) in the range of 1 Pa.s
to 50 Pa.s, preferably 2 Pa.s to 25 Pa.s and more preferably 5 Pa.s to 10 Pa.s.
3. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein the detergent
surfactant for the said aqueous liquid dish washing detergent composition herein is
selected from at least one of the followings: alkyl benzene sulfonates (LABS), Linear
alkylbenzene sulfonic acid (LABSA), sodium lauryl ether sulfate (SLES), sodium
dodecyl sulfate (SDS), sodium palmityl sulfate, sodium octadecyl sulphate, sodium
octyl sulphate, water-soluble alkyl sulfates, ether sulfates, and alcohol ethoxylates,
alkyl polyglucosides (APGs), s α-sulfomethyl esters, ethoxylated amines,
alkanolamides, betaines, alkyldiphenyl, oxide disulfonates, linear alkyl benzene
sulfonate (LAS), potassium lauryl alkyl sulfate, sodium palmityl alkyl sulfate, sodium
myristyl alkyl sulfate, potassium palmityl alkyl sulfate, potassium decyl sulfate,
sodium coconut alkyl sulfate, potassium coconut alkyl sulfate, potassium myristyl
alkyl sulfate, magnesium dodecyl sulfate, magnesium C12-15 alkyl sulphate etc.4. The
pourable dishwash detergent, as claimed in claim 1 or 2, wherein the water insoluble
abrasive particles is selected either from natural, or organic origin, in the range of
about 1 wt% to about 30 wt.% thereof, having mean particle size of 0.1 to 100
microns.
4. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein the abrasive
material for the said detergent composition are selected from Calcite (calcium
carbonate), aluminium oxide, pumicite, ashes, silica, natural abrasive particles such
as nut shell particles, polymeric abrasive particles etc.
5. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein at least one
rheology modifying agent is selected from polycarboxylate or cellulose based
polymers.
6. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein comprising
from about 0.25% to about 10.0% of a polycarboxylate polymer rheology modifying
agent, having molecular weight greater than 100000 Da. The polycarboxylate
polymer is selected from partially crosslinked polyacrylic acid(s), copolymer of
acrylic acid and their salt(s), partially crosslinked polyacrylcates, copolymer of
acrylates. .
7. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein the cellulose
based rheology modifier for said detergent composition is selected from selected,
particularly from the group of Methyl cellulose, Ethyl cellulose, Ethyl methyl
cellulose, Carboxy-Methyl-Cellulose (or cellulose gum).
8. The pourable dishwash detergent, as claimed in claim 1, comprising 0% to about 25%
detergent surfactant mixture.
9. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein the said
composition comprising from 0% to up to 10% of a source of mono or polyvalent
cation; wherein the salt is selected from sodium chloride, sodium bromide, sodium
nitrate, sodium sulphate, sodium phosphate, potassium chloride, potassium bromide,
potassium nitrate, potassium sulphate, ammonium chloride, sodium acetate, calcium
chloride, magnesium chloride, magnesium sulfate, zinc chloride, aluminium chloride
etc.
10. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein the pH of the
said detergent composition is in the range of 5-12 and the pH modifying Agent
selected for the said detergent composition is selected from citric acid, malic acid,
maleic acid, lactic acid, acetic acid, adipic acid, tarteric acid, soda, sodium hydroxide,
sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, triethanolamine,
ethanolamine, sodium borate etc.
11. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein said
composition has viscosity value at ambient condition (25 °C) in the range of 1 Pa.s to
50 Pa.s, preferably 2 Pa.s to 25 Pa.s and more preferably 5 Pa.s to 10 Pa.s.
12. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein said
composition optionally comprises additives namely enzyme, selected from Amylase,
cellulose, protease, pectinase, lipase, mannanase.
13. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein said
composition optionally comprises additives namely chelator, selected from 1-
Hydroxyethylidene (1,1-diphosphonic acid); Ethylene diamine tetraacetate; 2-
Phosphono 1,2,4-butane tricarboxylic acid; Ethylenediamine tetra (methylene
phosphonic acid); Diethylenetriamine penta (methylene phosphonic acid);
Diethylenetriamine penta (methylene phosphonic acid).
14. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein said
composition optionally comprises additives namely builder, selected from Sodium
carbonate, sodium bicarbonate, poly (styrenesulfonate-methacrylate) copolymers,
polyacrylic acid, polymethacylic acid, sodium tripolyphosphate.
15. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein said
composition optionally comprises additives namely preservative, selected from
DMDM hydantoin; Benzisothiazolinone; Methylisothiazolinone; Phenoxyethanol;
benzoic acid; sodium sorbate, potassium sorbate.
16. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein said
composition optionally comprises perfume additives to deliver required olfactives.
17. The pourable dishwash detergent, as claimed in claim 1 or 2, wherein said
composition optionally comprises additives namely hydrotrope/solvent, selected from ethanol, isopropanol, ethylene glycol, propylene glycol, sodium cumene sulfonate,
sodium xylene sulfonate, sodium toluene sulfonate.
18. The pourable liquid cleaning composition with suspended abrasive particles for
enhanced cleaning, as claimed in claim 1 or 2, wherein said cleaning composition is
characterized in achieving its higher cleaning score while manual application on hard
surfaces, selected from any one of the followings:-
• surface of metallic or non-metallic dishes and utensils used in kitchen and for foodserving;
• surface typically found in and around houses like kitchens, bathrooms, floors, walls,
tiles, windows, cupboards, sinks, showers, shower plastified curtains, wash basins,
WCs, fixtures and fittings and the like made of different materials like ceramic,
vinyl, no-wax vinyl, linoleum, melamine, glass, Inox®, Formica®, any plastics,
plastified wood, metal or any painted or varnished or sealed surface and the like;
• hard surfaces of household appliances including refrigerators, freezers, washing
machines, automatic dryers, ovens, microwave ovens, dishwashers and so on.