CROSS REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of U.S. PTX)visional Patent Application Serial No. 61/234,456, filed on August 17, 2009, the disclosure of which is incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to broad spectrum preservation blends. In particular, the present invention relates to preservation blends that incorporate benzyl alcohol, salicylic acid, sorbic acid and an additive. The additive is selected from the group consisting of 1,3-propanol, dehydroacetic acid, glycerin and a combination thereof The preservation blends of the invention are stable at low temperatures and have a high efficacy against a broad spectrum of microorganisms at a wider than expected pH range.
Brief Description of Art
Preservatives have wide applications in fields like personal care, industrial, health and hygiene, pharmaceutical and wood protection. Preservatives can be a single agent or a blend of multiple agents.
Ideally, a preservative has broad-spectrum activity against all types of microorganisms at various pH levels. The preservative should also have high efficacy so that a minimum amount of the preservative can be used to save cost and to avoid or reduce any possible adverse effects caused by the preservative. Also, it is desirable that the preservative is stable to any changes in temperature encountered during manufacturing, packaging, and shipping as well as during storage of the preservative. Further, an ideal preservative is physically and chemically compatible with ingredients of different application systems so that one preservative can suitably be incorporated in various products.
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Benzyl alcohol, salicylic acid and sorbic acid are known preservative agents, but individually they are of limited usefulness with regards to broad spectrum activity because these actives are known to have poor activity at more neutral and alkaline pH. In addition, salicylic acid and sorbic acid can be difficuh to solubilize at high concentrations, thus making an effective concentrate difficult to achieve.
Certain preservative blends containing cither one or more of benzyl alcohol, salicylic acid, or sorbic acid are known. For example, Optiphen® BSB-N from ISP is a combination of benzoic acid, sorbic acid and benzyl alcohol and glycerin. Sharomix® 705 from Sharon Laboratories is a liquid blend of benzyl alcohol, benzoic acid, sorbic acid and dehydroacetic acid. However, the application of these preservatives is limited because they are only suitable for low pH systems (up to pH 6.5).
US patent application publication 2009/0123577 to Air Liquide Sante, the disclosure of which is incorporated herein in its entirety, discloses a liquid concentrate for preserving cosmetics including a carboxylic acid component (A) containing at least two carboxylic acids selected from benzoic acid, propionic acid, salicylic acid, sorbic acid, 4-hydroxybenzoic acid, dehydroacetic acid, formic acid and 10-undccylcnic acid; an alcohol component (B) selected from phcnoxycthanol, benzyl alcohol. Unfortunately, the preservative concentrate disclosed in the publication uses up to 40% of water as solvent. As water freezes at 0°C, this may cause difficulties in handling the disclosed concentrate at low temperatures. Further, the disclosed preservatives are suitable for use in systems having a pH of less than 7, in particular less than 6.
Accordingly, there is a continuing need for another preservative, which is stable at low temperatures, and which has a high efficacy against a broad spectrum of microorganisms at a wide pH range. The present invention provides one answer to that need.
BRIEF SUMMARY OF THE INVENTION
One aspect of the present invention is directed to a composition having effective broad spectrum preservation activity comprising (a) benzyl alcohol, (b) salicylic acid, (c) sorbic acid and (d) a compound selected from the group consisting
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of 1,3-propanediol, glycerin and a combination thereof. In the composition, component (a) is present at a concentration of from about 70% to about 90% by weight, component (b) is present at a concentration of from about 1% to 15% by weight, component (c) is present at a concentration of from about 1% to 4% by weight, and component (d) is present at a concentration of from about 1% to 15% by weight, provided that the total amount of components (b) and (c) is no more than 15% by weight, all based on the total weight of the composition. The composition may optionally contain dehydroacetic acid.
Still another aspect of the present invention is directed to a composition having effective broad spectrum preservation activity comprising benzyl alcohol, salicylic acid, sorbic acid, and glycerin wherein benzyl alcohol is present at a concentration of from about 77% to about 86%, salicylic acid is present at a concentration of from about 8% to about 11%, sorbic acid is present at a concentration of from about 2.5% to about 3.5% and glycerin is present at a concentration of from about 3% to about 5% by weight, based on the total weight of the composition.
Yet another aspect of the present invention is directed to topical formulations containing the preservative of the invention.
DETAILED DESCIOPTION OF THE INVENTION
The present invention provides a stable preservation blend composition having effective broad spectrum preservation activity at neutral, acidic and alkaline pH. The composition contains: (a) benzyl alcohol, (b) salicylic acid, (c) sorbic acid, and (d) a compound selected from the group consisting of 1,3-propanediol, glycerin and a combination thereof
The amount of components (a)-(d) of the preservation blend according to this invention may vary. Preferably, benzyl alcohol constitutes from about 70% to about 90% by weight, more preferably, about 77% to about 86% by weight, based on the total weight of the composition. Salicylic acid is present at a concentration of from about 1% to about 15%, preferably from about 3% to 12%, more preferably from 8% to 11%; sorbic acid is present at a concentration of from about 1% to about 4%, preferably from 2.5% to about 3.5% by weight, and component (d) is present at a concentration of from 1 % tol 5%, preferably from 1 % to 10% by weight, more

preferably from 2% to 5%, based on the total weight of the composition. Preferably, the total amount of components (b) and (c) is no more than 15% by weight based on the total weight of the composition. In some embodiments, the total weight percentages of components (a), (b), (c) and (d) combined is 100%.
Optionally, the preservation blend of the invention may additionally contain dchydroacctic acid. If present, the total amount of salicylic acid, sorbic acid, and dehydroacetic acid is no more than 15 wt% based on the total weight of the preservation blend, In one embodiment, the weight ratio of dehydroacetic acid to component (d) of the preservation blend is from about 3:1 to about 1:1.
In some embodiments of the invention, the preservative blends are free or substantially free of water. In other embodiments, the blends are free or substantially free of benzoic acid. As used herein, "essentially free" is intended to mean that the composition preferably contains less than 1000 ppms, more preferably less than 100 ppms, and most preferably zero ppms, of water or benzoic acid.
In one preferred embodiment, the invention provides a preservation blend composition comprising from about 77 vvt% to about 86 wt% of benzyl alcohol, from about 8 wt% to about 11 wt% of salicylic acid, from about 2.5 wl% to about 3.5 wt% of sorbic acid and from about 2 v^t% to about 5 wt% of glycerin by weight, based on the total weight of the composition.
As used herein, the term "effective preservation activity" means that its activity is such that the composition or formulation is protected for a sustained period of time, in particular during the so-called "shelf life" of the product. The "shelf-life" of a product is determined according to methods generally knovm in the art.
The term "broad spectrum" as used in this specification and claims means a preservative having good preservation properties against a wide spectrum of microorganisms that commonly will cause deterioration or spoilage of personal care products, such as cosmetics, and various products with other applications such as pharmaceutical compositions, wood preservative systems, industrial, and health and hygiene.
The preservation blends of the invention have a relatively high organic acid level, yet are stable at low temperatures. They are effective at low concentrations and have a broad-spectrum of activity against various types of microorganisms. The preservative blends of the invention also have surprisingly good antimicrobial

performance at neutral, acidic and low alkaline pH, and can be incorporated into a wide range of formulations.
The composition of the present invention can be made by mixing benzyl alcohol, salicylic acid, sorbic acid and component (d) in any order. It can be suitably incorporated into various products, for example, personal care formulations, pharmaceutical compositions, wood preservative systems, industrial, and health and hygiene products.
In one embodiment, this invention further relates to topical formulations containing a preservation blend as defined herein. Preferably, the preservation blend is present at a concentration of from about 0.5% to about 1.5%, more preferably from about 0.6% to about 1% based on the total weight of the topical formulation. Topical compositions comprise dermatological formulations (or topical pharmaceutical formulations), as well as cosmetic formulations. The topical formulations may further contain other ingredients or additives used in dermatological or in cosmetic formulations, including other active ingredients.
The formulations according to the present invention are formulated into forms that are useful in personal care products, especially in emulsions.
The topical formulations according to the present invention may additionally contain further ingredients or additives such as solvents, surfactants, emulsifiers, consistency factors, conditioners, emollients, skin caring ingredients, moisturizers, thickeners, lubricants, fillers, anti-oxidants, other preservatives, active ingredients, in particular dermatologically active ingredients, fragrances and the like, as well as mixtures thereof Active ingredients as mentioned herein comprise, for example, anti-inflammatories, anti-bacterials, anti-fungals and the like agents. Active ingredients suited for topical applications are particularly preferred.
Suitable surfactants comprise: alkyl sulfates e.g. sodium lauryl sulfate, ammonium lauryl sulfate; sodium cetearyl sulfate; alkyl sulfoacetates e.g. sodium lauryl sulfoacetate; alkyl ether sulfates e.g. sodium laureth sulfate; sodium trideceth sulfate; sodium oleth sulfate; ammonium laureth sulfate; alkyl ether sulfosuccinates e.g. disodium laureth sulfosuccinate; alkyl glycosides e.g. decyl glucoside; lauryl glucoside; alkyl isethionates amphoterics e.g. cocamidopropyl betaine; sodium cocoamphoacetate; sodium lauroamphoacetate; disodium lauroamphodiacetate; disodium cocoamphodiacetate; sodium lauroamphopripionate; disodium

lauroamphodipropionate; potassium or ammonium salts of the aforementioned ampiioterics; capryL^capramidopropyl betaine; undecylenamidopropyl betaine; lauromidopropyl betaine; and fatty alcohol polyglycol ethers.
Suitable emulsifiers are e.g. anionics as salts of fatty acids e.g. sodium stearate or sodium palmitate, organic soaps e.g. mono-, di- or triethanolaminoleate, sulfated or sulfonated compounds e.g. sodium lauryl sulfate or sodium cctyl sulfonate, saponines, lamepones; cationics as quaternary ammonium salts; nonionics as fatty alcohols, fatty acid ester with saturated or unsaturated fatty acids, polyoxyethylenesters orpolyoxyethylenethers of fatty acids, polymers from ethylene oxide and propylene oxide or propylene glycol, amphotherics as phosphatides, proteins as gelatine, casein alkylamidobetaines, alkyl betaines and amphoglycinates, alkyl phosphates, alkylpolyoxyethylene phoaphates or the corresponding acids, silicone derivatives, e.g. alkyl dimethiconecoplyol.
Suitable consistency factors are e.g. fatty alcohols or their mixtures with fatty acid esters, e.g. acetylated lanolin alcohol, aluminum stearates, carbomer, cetyl alcohol, glyceryl oleate, glyceryl stearate, glyceryl stearate (and) PEG 100 stearate, magnesium stearate, magnesium sulfate, oleic acid, stearic acid, stearyl alcohol, myristyl myristatc, isopropyl palmitate, beeswax and synthetic equivalents thereof, carbomers, and the like. Suitable conditioners are e.g. alkylamido ammonium lactate, cetrimonium chloride and distearoylethyl hydroxyethylmonium methosulfate and cetearyl alcohol, cetyl dimethicone, cetyl ricinoleate, dimethicone, laureth-23, laureth-4, polydecene, retinyl palmitate, quatemized protein hydrolysates, quatemized cellulose and starch derivatives, quatemized copolymers of acrylic or methacrylic acid or salts, quatemized silicone derivatives.
Suitable emollients are e.g. cetearyl isononanoate, cetearyl octanoate, decyl oleate, isooctyl stearate, coco caprylate/caprate, ethylhexyl hydroxystearate, ethylhexyl isononanoate, isopropyl isostearate, isopropyl myristate, oleyl oleate, hexyl laurate, paraffinum liquidum, PEG-75 lanolin, PEG-7 glyceryl cocoate, petrolatum, ozokerite cyclomethicone, dimethicone, dimethicone copolyol, dicaprylyl ether, butyrospermum parkii, buxus chinensis, canola, camauba cera, copemicia cerifera, Oenothera biennis, elaeis guineensis, prunus dulcis, squalane, zea mays, glycine soja, helianthus annuus, lanolin, hydrogenated castor oil, hydrogenated coconut oil,
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hydrogenated polyisobutene, sucrose cocoate, stearoxy dimethicone, lanolin alcohol, isohexadecane.
Suitable skin care ingredients are e.g. plant extracts, bisabolol, anti¬inflammatory agents, urea, allantoin, panthenol and panthenol derivatives, phytantriol, vitamins A, E, C, D, ceramides of animal or plant origin, lecithins, and the like.
Suitable moisturizers arc e.g. butylcncs glycol, cctyl alcohol, dimethicone, dimyristyl tartrate, glucose glycereth-26, glycerin, glyceryl stearate, hydrolyzed milk protein, lactic acid, lactose and other sugars, laureth-8, lecithin, octoxyglycerin, PEG-12, PEG 135, PEG-150, PEG-20, PEG-8, pentylene glycol, hexylene glycol, phytantriol, poly quatemium-39 PPG-20 methyl glucose ether, propylene glycol, sodium hyaluronate, sodium lactate, sodium PCA, sorbitol, succinoglycan, synthetic beeswax, tri-C14-15 alkyl citrate, starch.
Suitable thickeners are e.g. acrylates/steareth-20 methacrylate copolymer, carbomer, carboxymethyl starch, cera alba, dimethicone/vinyl dimethicone crosspolymer, propylene glycol alginate, hydroxyethylcellulose, hydroxypropyl methylcellulose, silica, silica dimethyl silylate, xanthan gum, hydrogenated butylenes/ethylene/styrene copolymer.
Suitable lubricants arc e.g. adipic acid, fumaric acid and its salts, benzoic acid and its salts, glycerine triacetate, sodium or magnesium lauryl sulfate, magnesium stearate, solid polyethylenglycol, polyvinylpyrrolidone, boric acid, mono-laurate or mono-palmitate, myristyl alcohol, cetyl alcohol, cetylstearyl alcohol, talcum, calcium or magnesium salts of higher fatty acids, mono-, di- or triglycerides of higher fatty acids, polytetrafluorethylen.
Suitable antioxidants are e.g. sulfites, e.g. sodium sulfite, tocopherol or derivates thereof, ascorbic acid or derivates thereof, citric acid, propyl gallate, chitosan glycolate, cysteine, N-acetyl cysteine plus zinc sulfate, thiosulfates, e.g. sodium thiosulfate, polyphenoles and the like.
I The compositions may fiirther contain active ingredients, e.g. anti-
microbials, anti-inflammatories, plant extracts, bisabolol, panthenol, tocopherol, actives for anti-stinging, anti-irritant or anti-dandruff applications, or anti-aging agents such as retinol, melibiose and the like. Other suitable actives are e.g. Medicago officinalis, Actinidia chinensis, allantoin. Aloe barbadensis, Anona cherimolia, Anthemis nobilis, Arachis hypogaea. Arnica Montana, Avena sativa, beta-

carotene, bisabolol, Borago officinalis, butylenes glycol, Calendula officinalis, Camellia sinensis, camphor, Candida bombicola, capryloyl glycine, Carica papaya, Centaurea cyanus, cetylpyridinium chloride, Chamomilla recutita, Chenopodium quinoa, Chinchona succirubra, Chondrus crispus, Citrus aurantium dulcis, Citrus grandis, Citrus limonum, Cocos nucifera, CofFea Arabica, Crataegus monogina, Cucumis mclo, dichlorophcnyl imidazoldioxolan, Entcromorpha comprcssa, Equisetum arvense, ethoxydiglycol, ethyl panthenol, famesol, ferulic acid, Fragaria chiloensis, Gentiana lutea, Ginkgo biloba, glycerin, glyceryl laurate, Glycyrrhiza glabra, Hamamelis virginiana, heliotropine, hydrogenated palm glycerides, citrates, hydrolyzed castor oil, hydrolyzed wheat protein, Hypericum perforatum. Iris florentina, Juniperus communis, Lactis proteinum, lactose, Lawsonia inermis, linalool, Linum usitatissimum, lysine, magnesium aspartate, Magnifera indica, Malva sylvestris, mannitol, mel Melaleuca altemifolia, Mentha piperita, menthol, menthyl lactate, Mimosa tenuiflora, Nymphaea alba, olaflur, Oryza sativa, panthenol, paraffinum liquidum, PEG-20M, PEG-26 jojoba acid, PEG-26 jojoba alcohol, PEG-35 castor oil, PEG-40 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-8 caprylic/capric acid, Persea gratissima, petrolatum, potassium aspartate, potassium sorbatc, propylene glycol, Prunus amygdalus dulcis, Prunus armcniaca, Prunus persica, retinyl palmitate, Ricinus communis, Rosa canina, Rosmarinus officinalis, Rubus idaeus, salicylic acid, Sambucus nigra, sarcosine, Serenoa serrulata, Simmondsia chinensis, sodium carboxymethyl betagiucan, sodium cocoyi amino acids, sodium hyaluronate, sodium palmitoyl praline, stearoxytrimethylsilane, stearyl alcohol, sulflirized TEA-ricinoleate, talc. Thymus vulgaris, Tilia cordata, tocopherol, tocopheryl acetate, trideceth-9, triticum vulgare, tyrosine, undecylenoyl glycine, urea, Vaccinium myrtillus, valine, zinc oxide, zinc sulfate.
The preservative blends of the invention can be used in emulsions (both oil-in-water and water-in-oil), in aqueous solutions, in PIT (phase inversion temperature) emulsions, in oily solutions, in foaming cosmetic formulations (foams), and in so-called multiple emulsions, e.g. in triple emulsions (such as water/oil/water emulsions).
The preservative blends of the invention can also be formulated as creams, gels, liquids or lotions. They can be used in shampoos, hair conditioners, hair dyes, hair preparations, aftershave lotions, bath soaps and detergents, fragrance

preparations, sun care products, indoor tanning products, body and hand preparations, personal cleansers, shaving preparations, tonics, dressings and other hair grooming aids, moisturizing preparations, skin care preparations, wipes and the like. These compositions can be also used in a variety of non-personal care products.
The topical formulations of the invention are prepared by adding other ingredients to a composition as defined herein, or addition to a mixture of ingredients a composition as defined herein. Alternatively, said formulations may also be made by mixing the ingredients individually or by group-wise mixing. Subsequently other specific ingredients, such as perfumes, may be added.
The present invention is further described in detail by means of the following Examples. All parts and percentages are by weight and all temperatures are degrees Celsius unless explicitly stated otherwise.
EXAMPLES
EXAMPLE 1 STABILITY OF PRESERVATIVE CONCENTRATES
Procedure: Preservative blends ETC 1-6 and comparative blends A-G as shown in Table 1 and Table 2, were prepared by mixing the components together with gentle heating. The blends were stored either in a refiigerator (2-4 °C) or a fi-eezer (-17 "C), and then were allowed to warm up to room temperature. The characteristics of the blends at 2 °C and after freezing at -17 °C were summarized in Table 1 and Tabic 2.
Results: As shown in Table 1, when the total amount of salicylic acid, sorbic acid and dehydroacetic acid is less than 15 wt%, the use of co-solvent, 1,3-propanediol and glycerin helps with stabilizing these acids in benzyl alcohol at low temperatures. Although the co-solvent does not prevent fi-eezing of the blends at -17 "C, it does enable the blends to readily thaw and redissolve without or with limited mixing.
As shown in Tabic 2, when the total amount of salicylic acid and sorbic acid was greater than 15%, although co-solvent 1,3-propanediol was present, the blends froze after storage at 2-4 °C. After the blends were stored at -17 °C, crystals were settled out and mixing was needed to re-dissolve the precipitates.
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Table 1: Effect of co-solvents (1,3-propanediol and glycerin) on blend characteristics upon refrigeration and freezing
Blend Ben/yl Salicylic Sorbic Dehydro- M- Glycerin Characteristics
# alcohol acid acid acetic propane- at 2 "C and
acid diol after freezing
at-n'C
ECT 1 Clear sol at 2 "C,
83% 11% 3% - 3% - crystals settled
out after freeze/
thaw cycle
ECT 2 Clear sol at 2 "C,
83% 4% 3% 7% 3% - crystals settled
out after freeze
/thaw cycle
ECT 3 Clear sol at 2 "C,
crystals formed
83% 8% 3% 3% 3% - by freeze/thaw
cycle re-dissolve
wdthout mixing
ECT 4 Clear sol at 2 °C,
very few
crystals fomied
83% 11% 3% - - 3% by freeze/thaw
cycle all re-dissolve without
mixing
ECT 5 Clear sol at 2 "C,
crystals formed
83% 4% 3% 7% - 3% byfi-eeze/thaw
cycle re-dissolve
v^dthout mixing
ECT 6 Clear sol at 2 °C,
least amount of
crystals formed
83% 8% 3% 3% - 3% by freeze/thaw
cycle all re-
dissolve without
I I \ I I I I mixing
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Table 2: Effect of co-solvent (1,3-propanediol) on blend characteristics upon
refrigerated storage
Characteristics Characteristics after
Blend after storage in freeze/thaw cycle
(Compar- Benzyl Salicylic Sorbic 1,3- refrigerator (2-4
ative) alcohol acid acid propanediol "C)
Very thick layer of
Froze in the cold, crystals settled out,
went back into went back into
solution with solution after about 1
_A 81.0% 13.0% 6.0% mixing hour of mixing
Thick layer of crystals
Froze in the cold, settled out, went back
went back into into solution after
solution with about 40 minutes of
_B 80.0% 13.0% 6.0% 1.0% mixing mixing
A layer of crystals
Froze in the cold, settled out, went back
went back into into .solution after
solution with about 10 minutes of
_C 81.0% 12.5% 5.5% 1.0% nuxmg mixing
Did not completely Very thick layer of
freeze (slushy), cry.slals settled out,
went back into went back into
solution with solution after about 10
_D 79.0% 13.0% 6.0% 2.0% mixing minutes of mixing
Did not completely Thick layer of crystals
freeze (slushy), settled out, went back
went back into into solution after
solution with about 10 minutes of
_E 80.0% 12.5% 5.5% 2.0% mixing mixing
Did not freeze, a A thin layer of crystals
few ciystals ppt, settled out, went back
went back into into solution after
solution with about 5 minutes of
_F 80.0% 12.0% 5.0% 3.0% mixing mixmg
Froze, but very A thin layer of crystals
rapidly melted to settled out, went back
give a solution with into solution after
a few crystals ppt, about 10 minutes of
went back into mixing
solution with
_G I 79.0% I 12.5% I 5.5% | 3.0% | mixing |

EXAMPLE 2. MICROBIOLOGICAL EFFICACY - 1% Preservation Blends
CTFA Challenge Test Procedure: A challenge protocol similar to the CTFA method was followed to assess efficacy against a broad spectrum of microorganisms. The five separate inocula were; Staphylococcus aureus (ATCC 6538), mixed Pseudomonas aeruginosa (ATCC 9027) and Burkholderia cepacia (ATCC 25416), mixed Klebsiella pneumoniae (ATCC 4352) and Enterohacter gergoviae (ATCC 33028), Candida albicans (ATCC 10231), and a mixture of molds: Aspergillus niger (ATCC 16404) and 2 Penicillium sp. isolated from cosmetic products. Samples (35 grams each) were inoculated with approximately 2,000,000 bacteria per gram or 100,000 yeast cells or mold spores per gram. Individual challenges were prepared from overnight slants of bacteria and yeast cultures and fh)m heavily sporulating mold cultures, 7 to 10 days old. All samples were plated quantitatively for viable organisms after 24 hours and weekly for up to 4 weeks. Samples inoculated with mold spores were also plated after 48 hours. Samples were re-challenged after four weeks (or sooner where appropriate) and the same sampling regime followed.
Recommended "Pass" Criteria: CTFA recommends at least a 99.9% reduction of vegetative bacteria and at least a 90% reduction of yeasts and molds within 7 days following each challenge with no increase in count thereafter.
Test Formulations:
The formulations used to demonstrate the efficacy of our blends were as follows.
i. Oil in water lotion, pH 6.5, AR12-034
ii. Hair Conditioner, pH 3.99, AR13-069 (same as AR5-024)
iii. Make-up Remover, pH 5.15, AR12-067 (Rcf # KKL9-181)
iv. Lotion, pH 7.85, KKL 14-46
V. Water in Oil Emulsion, pH N/A, AR12-068
vi. Make-up Remover, pH 8.1, KKL 14-45
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The preservative concentrates were added to these formulations to give a final concentration of 1% .
Summary of Test Results:
(i) Oil in water lotion, pH 6.5, AR12-034 (Data shown in Tables 3 through 5d)
Initial screen with ECTl, ECT2 and ECT 3 blends showed excellent reduction of all challenge organisms occurred within 24 hours in the preserved samples and all were reduced to <10 cfu/g within one week, whereas the unpreserved controls had high counts during the test period.
Table 3. Inoculum - Colony Forming Units Added per Gram (CFU/g) of Oil in
water lotion pH 6.5
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S. aureus 2.9x10^ 1.6x10^
K. pneumoniae+E. gergoviae 4.0x10 2.9x10
P. aeruginosa + B. cepacia 2.0x10 1.2x10
C. albicans 8.5x10^ 1.6x10^
Mixed Mold I 9 0x10" | 9.0x10"
Table 4. Inoculum Recovered from Unpreserved Oil in water lotion pH 6.5 at '0'
Hour- Colony Forming Units per Gram
(CFU/g)
Challenge #1 Challenge #2
Organism CFU/g CFU/p
S.aureus 1.3x10° 1.9x10^
K.pneumoniae+E. gergoviae 3.1x10 7.0x10^
P. aeruginosa + B. cepacia 7.9x10 4.2x10°
C. albicans 6.8x10" 1.3x10°
Mixed Mold I 8.0x10" | 7.0x10"

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(iii) Make-up Remover, pH 5,15, AR12-067 (Data shown in Tables 9 through 11 c)
Excellent reduction of all challenge organisms occurred within 24 hours in the preserved samples and all were reduced to <10 cfu/g within one week. S. aureus and the K. pneumoniae/E. gergoviae inocula died off within one week in the unpreserved sample. The short survival time of these organisms makes the results somewhat inconclusive but there is some evidence for efficacy at the 24 hour sampling time.
Table 9 Inoculum - Colony Forming Units Added per Gram (CFU/g) of Make-up
Remover
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S. aureus 2.1x10^ 2.6x10^
K. pneumoniae+E. gergoviae 4.0x10^ 3.5x10^
P. aeruginosa + B. cepacia 3.8x10 4.4x10°
C. albicar)s 4.8x10^ 1.7x10^
Mixed Mold I 1.4x10'^ | 1.0x10^
Table 10 Inoculum Recovered from Unpreserved Make-up Remover, pH 5.15 at
'0' Hour Colony Forming Units per Gram (CFU/g)
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S. aureus 3.4x10_ ~ 5.4x10
K.pneumoniae+E. gergoviae 6.0x10 3.7x10
P. aeruginosa + B. cepacia 9.4x10 1.8x10^
C. albicans 2.9x10^ 9.1x10°
Mixed Mold I 7.0x10" | 7.3x10"*
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(iv) Lotion, pH 7.85, KKL 14-46 (Data shown in Tables 12 through 14c) Excellent reduction of all challenge organisms occurred within 24 hours in the preserved samples and all were reduced to < 10 cfu/g within one week. This formula is more difficult to preserve than the other four products being tested. All the challenge organisms are surviving in the unpreserved control and the P. aeniginosa/B. cepacia increased by > 90% between weeks one and two.
Table 12. Inoculum - Colony Forming Units Added per Gram (CFU/g) of
Product
Cliailenae #1 Challenge #2
Organism CFU/g CFU/g
S. aureus 1.8x10^ 1.4x10^
K. pneumoniae+E. gergoviae 3.3x10^ 2.7x10^
P. aeruginosa + B. cepacia 4.0x10^ 2.1x10^
C. albicans 1.7x10^ 1.2x10^
Mixed Mold | 2.3x10^ | 1.9x10^
Table 13. Inoculum Recovered from Unpreserved pH 7.85 Lotion at '0' Hour -Colony Forming Units per Gram (CFU/g)
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S.aureus 2.3x10° 1.7x10°
K.pneumoniae+E. gergoviae 2.9x10° ~ 3.1x10° ~
P. aeniginosa + 5. cepacia 2.3x10° 7.6x10'
C. albicans 1.3x10' " 1.8x10^
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(vi) Make-up Remover, pH 8.1, KKL 14-45 (Data shown in Tables 18 through 20c)
Excellent reduction of all challenge organisms occurred within 24 hours in the preserved samples and all were reduced to 10 cfu/g within one week. Although S. aureus and C. albicans died off within one week in the unpreserved sample, there was some differentiation between preserved and unpreserved samples at 24 hours.
Table 18. Inoculum - Colony Forming Units Added per Gram (CFU/g) of Make¬up Remover, pH 8.1
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S. aureus 2.4x10^ 4.4x10°
K. pneumoniae+E. gergoviae 4.0x10° 4.0x10°
P. aeruginosa + B. cepacia 3.8x10° 5.1x10°
C. albicans 1.3x10^ 4.2x10°
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* '' ..1.— I ■ I..I 1. , J
Table 19. Inoculum Recovered from Make-up Remover, pH 8.1 at '0' Hour-Colony Forming Units per Gram (CFU/g)
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S. aureus 7.3x10^ ~ 9.4x10_
K.pneumoniae+E. gergoviae 9.4x10 8.8x10
P. aeruginosa + B. cepacia 7.0x10 6.2x10°
C. albicans 3.4x10] 2.2x10^
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Conclusions: The ECT preservative blends can effectively protect cosmetic formulations against bacterial and fungal growth, at moderate use levels even in alkaline pH.
EXAMPLE 3. MICROBIOLOGICAL EFFICACY - 0.6% Preservation Blends
To ascertain an effective use range, Example 2 was repeated with blend ECT 4 at 0.6% dose rate.
Summary of Test Results:
ECT 4 tested at 0.6%, was effective in 4 of the 5 personal care formulations meeting CTFA recommendations for at least a 99.9% reduction of vegetative bacteria and at least a 90% reduction of yeasts and molds within 7 days following each challenge with no increase in count thereafter. It was not however, effective in the high pH Make-up Remover formulation.
Hair Conditioner, pH 3.99, AR13-069 (same as AR5-024) (Data shown in Tables 21 through 23b)
Excellent reduction of all challenge organisms occurred within 24 hours in the preserved samples. All challenge organisms were reduced to <10 cfu/g within one week following each challenge. Formulation met CTFA recommendations.
Table 21 Inoculum - Colony Forming Units Added per Gram (CFU/g) of Hair
Conditioner
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S. aureus 1.6x10^ 1.1x10^
K. pne.umoniae+E. jjergoviae \Ax\Q 1.9x10^
P. aeruginosa + B. cepacia 3.4x10 1.8x10^
C. albicans 1-5x10' 8.2x10"
Mixed Mold | 7.2x10" | 5.7x10"
3^

Table 22 Inoculum Recovered from Unpreserved Hair Conditioner at '0' Hour -Colony Forming Units per Gram (CFU/g)
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S.aureus 1.9x10^ 4.0x10^
K.pneumoniae+E. ger-goviae ^-2x10 1.0x10
P. aeruginosa + B. cepacia LlxW 1.5x10
C albicans 2.4x10-' 1.3x10^
Mixed Mold I 1.0x10' | 8.1x10^
33

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Make-up Remover, pH 5.15, ARl2-067 (Ref # KKL9-181), (Data shown in Tables 24 through 26b)
Excellent reduction of all challenge organisms occurred within 24 hours with 0.6% ECT 4 blend. All challenge organisms were reduced to <10 cfu/g within one week following each challenge. Formulation met CTFA recommendations.
Table 24 Inoculum - Colony Forming Units Added per Gram (CFU/g) of
Make-up Remover
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S. aureus 1.6x10^ 1.1x10^
K. pneumoniae+E. fjeryuviae 1-6x10 1.9x10
P. aeruginosa + B. cepacia 3.4x10 1.8x10^
C. albicans l-SxlO' 8.2x10"
Mixed Mold | 7.2x10" | 5.7xl0"
Table 25 Inoculum Recovered from Unpreserved Make-up Remover, pH 5.15 at '0' Hour Colony Forming Units per Gram (CFU/g)
Challenge #1 ChaUenge #2
Organism CFU/g CFU/g
S.aureus 3.7x10' 6.9x10*
K.pneumoniae+E. gergoviae 5.5x10 7.4x10
P. aeruginosa + B. cepacia 9.0x10 4.9x10
C. albicans 2.0x10' l.lxlO' ~
Mixed Mold | 6.5x10" 9.7x10"

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I This formulation was contaminated before the start of this testing and was
previously noted as being more susceptible to contamination than the other four products tested. Excellent reduction of all challenge organisms by 0.6% ECT 4 occurred within 24 hours. All challenge organisms were reduced to <10 cfii/g within one week following each challenge. Formulation met CTFA recommendations.
Table 27. - Inoculum - Colony Forming Units Added per Gram (CFU/g) of
Product
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S. aureus 1.5x10'' 1.6x10''
K. pneumoniae+E. gergoviae 1.7x10 1.6x10
P. aeruginosa + B. cepacia 2.3x10 2.6x10
C. albicans 5.2x10" 7.1x10"
Mixed Mold I 1.9x10" | 3.9xlO"
Table 28. - Inoculum Recovered from Unpreserved Lotion at '0' Hour -Colony Forming Units per Gram (CFU/g)
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S.aureus >3.0xlO^ 1.5x10'
K.pneumoniae+E. gergoviae >3.0xlO^ 2.1x10^
P. aeruginosa + B. cepacia 2.9x10^ 1.5x10'
C. albicans 1.0x10^ (2.5x10^*) 4.2x10^ (5.8x10^'^)
Mixed Mold I 2.3x10"(>3.0xlO^*) | 3.0x10" (6.3x10^*) ~
*bactcrial contaminant
31

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(i) Make-up Remover, pH 8.1, KKL 14-45 (Data shown in Tables 33 through 35b)
This formulation with 0.6% ECT 4 did not meet the CTFA recommendations for a 90% decrease in fungi within 1 week. The unpreserved samples had very little survival of the Staph. Klebsiella, Pseudomonas and Enterobacter; but the Pseudomonas, Burkholderia, yeast and fiingi did survive. Formulation did not meet CTFA recommendations, whereas a 1% dose gave good activity (see Table 20b). Testing was discontinued before the second challenge was to be done due to failiure of product.
Table 33.-Inoculum - Colony Forming Units Added per Gram (CFU/g) of Make-up Remover, pH 8.1 (45A-C)
Challenge #1 Challenge #2
Organism CFU/g CFU/g
5. aureus 1.5x10'^ -
K. pneumoniae+E. gergoviae 1.7x10 -
P. aeruginosa + B. cepacia 2.3x10 -_
C. albicans 5.2x10" -_
Mixed Mold I 1.9xl0" [
Table 34.- Inoculum Recovered from Make-up Remover, pH 8.1 (45A) at '0' Hour - Colony Forming Units per Gram (CFU/g)
Challenge #1 ChaUenge #2
Organism CFU/g CFU/g
S.aureus 6.1x10^ ;;
K.pne.umoniae+E. gergoviae 4.7x10^ ^
P. aeruginosa + B. cepacia 5.2x10 -
C albicans 1.2xl0" ;;
Mixed Mold | 6.5xl0" |

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To determine if the unexpected activity of ECT 4 at high pH (8.1) can be attributed solely to the activity of benzyl alcohol the high pH make-up remover was preserved with 1% ECT4 and with 0.83% benzyl alcohol (equivalent amount found in 1% ECT4).
Summary of Results:
The data shows that ECT4 is more effective than its benzyl alcohol alone, Tables 39 and 40 show that benzyl alcohol alone was not sufficiently efficacious against the mixed mold challenge. High pH Make-up Remover preserved only with benzyl alcohol did not meet CTFA recommendations for a minimum of 90% mold reduction in 7 days; the sample with 1% ECT4 does meet this criterion. This is unexpected as the organic acids in ECT4 would not be expected to have any activity at this high a pH.
Table 36.-InocuIum - Colony Forming Units Added per Gram (CFU/g) of Product
Organism Challenge #1 Challenge #2
5. aureus 2.5x10^ 2.0x10*
P. aeruginosa + B. cepacia 3.7x10 3.0x10
K. pneumoniae+E. gergoviae 1.8x10^ 3.0x10
C. albicans 1.3x10^ 1.6x10^
Mixed Molds 1.1x10^ | 2.2x10^
Table 37.- Inoculum Recovered from unpreserved product at '0' Hour -Colony Forming Units per Gram (CFU/g)
Challenge #1 Challenge #2
Organism CFU/g CFU/g
S.aureus 5.5x10* NP
P. aeruginosa + B. cepacia 2.3x10^ NP
K.pneumoniae+E. gergoviae 3.7x10^ NP
C. albicans 7.4x10^ NP
Mixed molds | 9.0x10'' NP
NP = Not Plated, contaminant overgrew challenge bacteria

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While the invention has been described above with reference to specific embodiments thereof, it is apparent that many changes, modifications, and variations can be made without departing from the inventive concept disclosed herein. Accordingly, it is intended to embrace all such changes, modifications and variations that fall within the spirit and broad scope of the appended claims. All patent applications, patents and other publications cited herein are incorporated by reference in their entirety.

We Claim:
1. A composition having effective broad spectrum preservation activity comprising: (a) benzyl alcohol, (b) salicylic acid, (c) sorbic acid and (d) a compound selected from the group consisting of 1,3-propanediol, glycerin and a combination thereof, wherein component (a) is present at a concentration of from about 70% to about 90% by weight, component (b) is present at a concentration of from about 1% to 15% by weight, component (c) is present at a concentration of from about 1% to 4% by weight, and component (d) is present at a concentration of from about 1% to 15% by weight, provided that the total amount of components (b) and (c) is no more than 15% by weight, all based on the total weight of the composition.
2. The composition of claim 1 wherein the composition is substantially free of water.
3. The composition of claim 1 wherein the total weight percentage of component (a), (b), (c) and (d) combined is 100%.
4. The composition of claim 1 wherein component (a) is present at a concentration of from about 77% to 86% by weight, component (b) is present at a concentration of from about 3% to about 12% by weight, component (c) is present at a concentration of from about 2.5% to 3.5% by weight, and component (d) is present at a concentration of from about 1% to 10% by weight, based on the total weight of the composition.
5. The composition of claim 1 wherein component (d) is glycerin presented at a concentration of from about 2% to about 5%.
6. The composition of claim 1 wherein component (d) is 1,3-propanediol presented at a concentration of from about 2% to about 5%.
7. The composition of claim 1 additionally comprises dehydroacetic acid, wherein the total amount of salicylic acid, sorbic acid, and dehydroacetic acid is no more than 15 wt% of the composition.
8. The composition of claim 7 wherein dehydroacetic acid and component (d) are present at a weight ratio range of from about 3:1 to 1:1.

9. The composition of claim 1 wherein component (a) is present at a concentration of from about 77% to about 86%, component (b) is present at a concentration of from about 8% to 11%, component (c) is present at concentration of from about 2.5% to 3.5%, and component (d) is glycerin present at a concentration of from about 2% to about 5%, all based on the weight of the composition.
10. A topical formulation comprising a composition of claim 1 and additives selected from the group consisting of solvents, surfactants emulsifiers, consistency factors, conditioners, emollients, skin caring ingredients, moisturizers, thickeners, lubricants, fillers, anti-oxidants, other preservatives, active ingredients, fragrances and mixtures thereof.
11. The topical formulation of claim 10 wherein composition of claim 1 is present at a concentration of from about 0.5% to about 1.5% based on the weight of the formulation.
12. The topical formulation of claim 11 wherein composition of claim 1 is present at a concentration of from about 0.6% to about 1% based on the weight of the formulation.
13. The topical formulation of claim 10 wherein the formulation is in the form of an oil-in-water emulsion.
14. The topical formulation of claim 10 wherein the formulation is in the form of a water-in-oil emulsion.