Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Reexamination Certificate
2000-09-20
2003-03-04
Hardee, John (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
C510S441000
Reexamination Certificate
active
06528473
ABSTRACT:
The present invention relates to dry solid granules of a system comprising particles of at least one hydrophobic organic active material (for example a detergent active material) encapsulated in solid particles of an alkali-water-soluble organic polymer obtained by emulsion polymerization, said particles being dispersed in and encapsulated by a matrix made of a water-soluble or water-dispersible dry organic compound; the invention is also directed toward a process for preparing said granules, as well as toward the use of said granules as additives, in particular detergent additives, in compositions intended for an alkaline aqueous medium or capable of forming an alkaline aqueous medium with water, in particular in detergent compositions; the invention is also directed toward detergent compositions comprising said additive.
The expression “detergent active material” means any active material which may be present in a detergent composition.
Active materials, such as biocides, bleaching activators, optical brighteners, anti-UV agents, antioxidants, bleaching catalysts, etc. may be present and may pose problems, either on account of their physical state (liquid to be adsorbed onto a support, in the case of washing powders) or on account of stability or corrosiveness with respect to other additives of the formulation in which they are contained.
The Applicant has found a system for encapsulating hydrophobic organic active materials, in particular detergent hydrophobic active materials, which allows the active material to be released essentially only in alkaline medium, for example during the washing of laundry.
A first subject of the invention consists of water-dispersible dry solid granules (G) of a system (S) comprising particles (pS), said particles (pS) comprising at least one hydrophobic organic active material (AM) encapsulated in solid particles (pAS) of an alkali-water-soluble organic polymer (AS) obtained by emulsion polymerization of at least one ethylenically unsaturated anionic monomer which can undergo radical-mediated polymerization and of at least one ethylenically unsaturated nonionic comonomer which can undergo radical-mediated polymerization, the amount of said anionic monomer(s) representing at least 10%, preferably at least 20%, most particularly from 25% to 60%, by weight of the total amount of monomers, said particles (pS) being dispersed in and encapsulated by a matrix made of at least one water-soluble or water-dispersible dry solid organic compound (MO), at least 0.1% by weight of at least one emulsifier relative to the weight of alkali-water-soluble copolymer (AS) being present at the interface: matrix (MO)/particles (pS) of system (S).
Any active material, whether solid or liquid (in native form or dissolved in a solvent), is suitable for the invention provided that it is immiscible or only very sparingly miscible with water.
The term “sparingly miscible” refers to active materials whose solubility in water at pH 7 does not exceed 20% by weight, preferably not 10% by weight.
Hereinbelow, the expression “active material” will be understood as referring to either a pure active material in its native form or in a solvent, or a mixture of active materials in their native forms or in a solvent.
Examples of active materials (AM) which may be mentioned are detergent hydrophobic active materials such as, for example, bleaching catalysts, biocides, bleaching activators, anti-UV agents, optical brighteners and antioxidants.
Examples of biocides which may be mentioned are bactericides (triclosan, etc.) and fungicides.
Examples of bleaching activators which may be mentioned are those which generate a peroxycarboxylic acid in the washing medium, such as tetraacetyl-ethylenediamine, tetraacetylmethylenediamine, etc.
Examples of optical brighteners which may be mentioned are stilbene or pyrazoline derivatives, coumarin, fumaric acid, cinnamic acid, azoles, methinecyanins and thiophenes.
Examples of anti-UV agents.or antioxidants which may be mentioned are vanillin and its derivatives.
Examples of bleaching catalysts which may be mentioned are derivatives of manganese or other metals, such as those described in U.S. Pat. No. 5,246,621, U.S. Pat. No. 5,244,594, U.S. Pat. No. 5,194,416, U.S. Pat. No. 5,114,606, EP-A-549 271, EP-A-549 272, EP-A-544 440, EP-A-544 490, U.S. Pat. No. 4,430,243, U.S. Pat. No. 5,114,611, U.S. Pat. No. 4,728,455, U.S. Pat. No. 5,284,944 and U.S. Pat. No. 5,246,612 etc.
The amount of active material (AM) which may be present in said particles (pS) of the system (S) can range from 20 to 70 and preferably from 40 to 60 parts by weight of active material (AM) per 100 parts by weight of alkali-water-soluble polymer (AS).
The expression “alkali-water-soluble polymer” (AS) means a polymer capable of dissolving or dispersing in an aqueous medium with a pH of greater than 7, preferably with a pH of at least 9.5 at a temperature from about 20° C. to 90° C. This polymer is not water-soluble at a pH below 7.
Said alkali-water-soluble polymers (AS) derive from at least one ethylenically unsaturated anionic monomer which can undergo a radical-mediated polymerization and from at least one ethylenically unsaturated nonionic comonomer which can undergo radical-mediated polymerization.
Examples of anionic monomers which may be mentioned are:
&agr;,&bgr;-ethylenically unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, etc.,
&agr;,&bgr;-ethylenically unsaturated sulfone-containing monomers, such as vinylbenzene sulfonate, etc.
Needless to say, the content of anionic monomer depends on the hydrophilicity of this monomer.
Said anionic monomers are preferably carboxylic monomers.
Examples of nonionic monomers which may be mentioned are:
vinylaromatic monomers: styrene, vinyltoluene, etc.,
alkyl esters of &agr;,&bgr;-ethylenically unsaturated acids: methyl, ethyl, etc. acrylates and methacrylates,
vinyl or allyl esters of saturated carboxylic acids, acetates, propionates, etc.,
vinyl or vinylidene halides: chlorides, etc.,
conjugated aliphatic dienes, butadiene, etc.,
&agr;,&bgr;-ethylenically unsaturated nitriles: acrylonitrile, etc.,
hydroxyalkyl esters of &agr;,&bgr;-ethylenically unsaturated acids: hydroxyethyl, hydroxypropyl, etc. acrylates and methacrylates,
&agr;,&bgr;-ethylenically unsaturated acid amides: acrylamide, methacrylamide, etc.
Said alkali-water-soluble polymers (AS) can also be derived from a monomer composition also containing at least one polyfunctional crosslinking comonomer (MR) (containing at least two ethylenic unsaturations) and/or at least one ethylenically unsaturated nonionic amphiphilic comonomer (MG) capable of forming grafted copolymers with the other comonomers.
Said polyfunctional crosslinking comonomer(s) (MR) can represent from about 0.01% to 1%, preferably from 0.01% to 0.5%, of all of the monomers in the monomer composition.
Examples of crosslinking comonomers (MR) which may be mentioned are:
glyoxal bis acrylamide
ethylene glycol diacrylate or dimethacrylate
trimethylolpropane trimethacryalate, pentaerithrityl triacrylate
polyallyl ethers of ethylene glycol, of glycerol, of pentaerithritol or of diethylene glycol
allyl acrylate
divinylbenzene, trivivylbenzene and alkyldivinyl-benzenes
divinyl ether
The said grafting nonionic amphiphilic comonomer(s) (MG) can represent up to 20% of all of the monomers.
Examples of grafting amphiphilic comonomers (MG) which may be mentioned are those of formula
CH
2
═C(R
1
)—C(O)—O—[CH
2
—CH(R
2
)O]
m
—[CH(R
3
)—CH
2
O]
n
—R
4
in which
R
1
is a hydrogen atom or a methyl radical
R
2
and R
3
, which may be identical or different, represent a hydrogen atom or an alkyl radical containing from 1 to 4 carbon atoms
4
is
an alkyl radical containing from 8 to 30 carbon atoms
a phenyl radical substituted with 1 to 3 1-phenylethyl groups
an alkylphenyl radical containing from 8 to 10 carbon atoms
n ranges from 6 to 100 and m ranges from 0 to 50, with the proviso that n is greater than or equal to m and their sum is between 6 and 100.
M
Joubert Daniel
Lannibois-Drean Hélène
Morvan Mikel
Hardee John
Rhodia Chimie
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