Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1996-09-24
1998-07-21
Fries, Kery
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510321, 510323, 510344, 510353, 510336, 510360, 510361, 510443, 510444, 510452, 510473, 510500, 510417, 510530, C11D 3386, C11D 337, C11D 310
Patent
active
057835470
DESCRIPTION:
BRIEF SUMMARY
The present invention is concerned with granular components comprising enzyme and specified polymeric binding materials. The granular components are particularly suitable for use in detergent compositions.
Background of the Invention
Enzyme encapsulates having a enzymatic activity of about 4 KNPU/g are commercially available today. As well as active enzymes, the encapsulates which are commercially available contain various fillers, binders and coating agents such as sodium chloride, sodium sulphate, methyl cellulose, yellow dextrin and kaolin clay. Representative of the prior art in this field is:
EP206418, published on 30 Dec. 1986, discloses enzyme granulates comprising fillers, binders, granulating agents etc.
The patent discloses encapsulates which comprise enzymes at a level of from 0.5 to 20%, preferably 5% by weight. The encapsulate also comprises (by weight):
1. Fillers at 3% to 97.5%, preferably 45%;
2. Cellulose at 2% to 40%, preferably 25%;
3. Binders at 0% to 10%;
4. Granulating aid at 5% to 40%;
However the fillers and binders that are known in the prior art are principally those which make either no active contribution to the detergent process or which have a low weight effectiveness in the detergent process. Such fillers and binders simply act as an unnecessary "load" on the washing process. Binders disclosed in EP206418 include polyvinyl pyrrolidone (PVP), dextrine, polyvinyl alcohol, hydroxypropyl cellulose, methyl cellulose and carboxy methyl cellulose (CMC). However in todays detergent products, where a high concentrations of active ingredients are required to achieve ever more "compact" products the presence of such fillers and binders is undesirable.
It is an aim of the present invention to provide an enzyme-containing granulate which has a high proportion of detergent-active ingredients.
It is a second aim of the present invention to provide a process for the manufacture of such enzyme-containing granulates.
This has been achieved by the selection of highly efficient binding materials which are also detergent-active ingredients. The binders of the present invention are more weight effective as detergent ingredients than the binders proposed by the prior art, including PVP and CMC.
Summary of the Invention
The granular components of the present invention comprise an enzyme and a polymeric binding material selected from the group consisting of:
Preferably the polymeric binding material is present at a level of from 0.1% to 25% by weight of the granular component (hereinafter termed the "granulate"), more preferably from 1% to 10%.
The granulate may also comprise one or more fillers such as alkali metal, or alkaline earth metal salts of carbonate, bicarbonate, citrate, phosphate. Citric acid may also be used as the filler.
The granulate may also comprise waxy granulating agents having a melting point between 30.degree. and 100.degree. C., as well as polyvinyl pyrrolidone and carboxymethyl cellulose.
The process of the present invention comprises the steps of:
(a) forming a powder from an enzyme solution and a particulate filler;
(b) granulating said powder with a granulating liquid to form a granulate; selected from the group consisting of:
Preferably, the granulating liquid further comprises a nonionic surfactant, or a mixture of nonionic surfactants.
In a particularly preferred process the granulate is mixed with a finely divided particulate flow aid such as sodium aluminosilicate, precipitated or fumed silica, or mixtures thereof.
DETAILED DESCRIPTION OF THE INVENTION
The polymeric binding materials of the present invention are chosen from the following :
a) Polyamine N-oxide Polymers
The polyamine N-oxide polymers suitable for use contain units having the following structure formula: ##STR1## wherein P is a polymerisable unit, whereto the R--N--O group can be attached to or wherein the R--N--O group forms part of the polymerisable unit or a combination of both. alicyclic groups or any combination thereof whereto the nitrogen of the N--O group can be attached or wherein th
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Fries Kery
Rasser Jacobus C.
Reed T. David
The Procter & Gamble & Company
Zerby Kim William
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