Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Reexamination Certificate
2000-10-30
2002-10-15
Hardee, John R. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
C510S444000
Reexamination Certificate
active
06465414
ABSTRACT:
The present invention relates to water-dispersible granules comprising a hydrophobic active material, in particular in liquid form, to a process for preparing them and to their use.
In certain sectors, for example such as the food, cosmetics, agrochemical or paints sector, it is necessary to prepare formulations using active materials in the form of hydrophobic liquid. One of the formulation possibilities is to prepare oil-in-water emulsions of such materials.
However, problems associated with the stability on storage of these emulsions are encountered. Specifically, it is common to observe a more or less pronounced separation of phases of the constituents of the emulsion. In addition, problems of deactivation of the active material may be encountered, said active material possibly degrading by hydrolysis during storage.
Finally, the fact should not be neglected that, in order to be readily manipulable and pumpable, such formulations have relatively low contents of active material and a large amount of water.
As regards certain solid hydrophobic active materials, these may pose problems of difficulties in manipulation due to the escape of said active materials into the atmosphere as dust, or difficulties in sensitivity with respect to the surrounding medium.
One object of the present invention is thus to propose a novel alternative to the problems mentioned above in the sense that the formulations proposed are powders containing high concentrations of active material, in particular in the form of hydrophobic liquid.
Thus, one subject of the invention is water-dispersible granules comprising:
at least one hydrophobic organic active material (AM) which is solid or has a melting point of less than 100° C., in the form of particles, which is finely divided in and encapsulated by a solid matrix made of a water-soluble or water-dispersible polypeptide (PP) which is synthetic or of plant origin
and at least one ionic or amphoteric dispersant (D) at the active material/matrix interface.
For good implementation of the invention, said water-dispersible granules comprise
from 5% to 90%, preferably from 40% to 85% and most particularly from 50% to 80%, of their weight of organic hydrophobic active material (AM),
from 3% to 90%, preferably from 10% to 60% and most particularly from 15% to 50%, of their weight of water-soluble or water-dispersible polypeptide (PP)
from 0.02% to 20%, preferably from 0.1% to 10%, of their weight of ionic or amphoteric dispersant (D), said percentages being expressed by weight of solids.
Said particles of active material (AM) can have a mean particle size from about 0.1 &mgr;m to 50 &mgr;m, preferably from about 0.1 &mgr;m to 10 &mgr;m and most particularly from 0.2 &mgr;m to 5 &mgr;m.
Any active material, whether solid or liquid (in unmodified 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 10% by weight.
Said hydrophobic organic active material preferably has a melting point of less than 100° C.; most particularly, this active material is liquid at ordinary temperature.
Hereinbelow, the expression “active material” will be understood as referring either to the pure active material (which may itself be a solvent) or a mixture of active materials, or to the active material (or a mixture of active materials) dissolved in a solvent.
Examples of active materials used in the food sector which may be mentioned are mono-, di- and triglycerides, essential oils, flavorings and colorings.
Examples of active materials used in the cosmetics sector which may be mentioned are silicone oils belonging, for example, to the dimethicone family.
Examples of active materials used in the paints sector which may be mentioned are alkyd resins, epoxy resins and blocked or unblocked isocyanates.
In the paper sector, mention may be made, for example, of bonding resins and water-repellent resins such as alkylketene dimer (AKD) or alkenylsuccinic anhydride (ASA).
In the detergency sector, mention may be made of silicone antifoams as possible active materials.
In the construction sector, mention may be made of water-repellent products, such as linear, cyclic and/or branched polyorganosiloxanes which can comprise hydroxyl, alkoxy, etc. reactive functions in the chain and/or at the end of a chain.
In the sector of plant-protective active materials, mention may be made of fungicides (iprodione, etc.), herbicides (isoproturon) and insecticides (synthetic pyrethroids, etc.).
It is likewise possible to use active materials such as lubricants for working or deforming materials.
When the active material is a solvent (or a mixture of solvents) or a solution in a solvent (or several solvents), said solvent is immiscible or is only sparingly miscible in water within the meaning indicated previously. Examples which may be mentioned are the solvents used for cleaning or stripping, such as aromatic petroleum fractions, terpenic compounds such as D-limonene or L-limonene, and solvents such as Solvesso®, aliphatic esters, such as the methyl esters of a mixture of acetic, succinic and glutaric acids (mixture of by-product acids from the synthesis of Nylon), liquid paraffins such as liquid petroleum jelly, alkanes, chlorinated solvents and synthetic or natural triglycerides.
Among the water-soluble or water-dispersible synthetic polypeptides (PP) which can constitute the matrix, mention may be made of homopolymers or copolymers derived from the polycondensation of amino acids or amino acid precursors, in particular of aspartic acid and glutamic acid or precursors thereof, and hydrolysis. These polymers can be not only homopolymers derived from aspartic acid or glutamic acid but also copolymers derived from aspartic acid and glutamic acid in all proportions, or copolymers derived from aspartic acid and/or glutamic acid and from other amino acids. Among the copolymerizable amino acids which may be mentioned are glycine, alanine, leucine, isoleucine, phenylalanine, methionine, histidine, proline, lysine, serine, threonine, cysteine, etc.
Among the polypeptides (PP) of plant origin which can constitute the matrix, mention may be made of proteins of plant origin; these are preferably hydrolyzed, with a degree of hydrolysis of less than or equal to 40%, for example from 5% to less than 40%.
Among the proteins of plant origin which may be mentioned as a guide are proteins originating from proteaginous seeds, in particular those of pea, bean, iupin, haricot and lentil; proteins originating from cereal seeds, in particular those of wheat, barley, rye, corn, rice, oat and millet; proteins originating from oleaginous seeds. in particular those of soya, groundnut, sunflower, rape and coconut; proteins originating from leaves, in particular from alfalfa and nettles; and proteins originating from underground reserves of plant organs, in particular those of potato and beetroot.
Said polypeptide (PP) is preferably a protein hydrolyzate obtained from soya or wheat.
The redispersible granules of the present invention contain an ionic or amphoteric dispersant (D).
Among the anionic dispersants which may be mentioned are
emulsifiers such as water-soluble salts of alkyl sulfates or of alkyl ether sulfates, alkyl isethionates and alkyl taurates or salts thereof, alkyl carboxylates, alkyl sulfosuccinates or alkyl succinamates, alkyl sarcosinates, alkyl derivatives of protein hydrolyzates, acyl aspartates, and alkyl and/or alkyl ether and/or alkylaryl ether ester phosphates. The cation is generally an alkali metal or alkaline earth metal, such as sodium, potassium, lithium or magnesium, or an ammonium group NR
4
+
with R, which may be identical or different, representing an alkyl radical which is unsubstituted or substituted with an oxygen or nitrogen atom.
dispersants such as lignosulfonates, polynaphthalene sulfonates, copolymers comprising units derived from at least one monomer chosen from unsaturated C
3
-C
5
acids, diacids
Guerin Giles
Morvan Mikel
Taquet Pascal
Hardee John R.
Rhodia Chimie
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