WO2012041411A1 - Air freshener gel with improved longevity - Google Patents
Air freshener gel with improved longevity Download PDFInfo
- Publication number
- WO2012041411A1 WO2012041411A1 PCT/EP2011/003208 EP2011003208W WO2012041411A1 WO 2012041411 A1 WO2012041411 A1 WO 2012041411A1 EP 2011003208 W EP2011003208 W EP 2011003208W WO 2012041411 A1 WO2012041411 A1 WO 2012041411A1
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- WO
- WIPO (PCT)
- Prior art keywords
- alkoxylated
- glycerol
- blend
- gel
- fatty acid
- Prior art date
Links
- 239000002386 air freshener Substances 0.000 title abstract description 17
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000000203 mixture Substances 0.000 claims abstract description 36
- 239000000194 fatty acid Substances 0.000 claims abstract description 12
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 11
- 229930195729 fatty acid Natural products 0.000 claims abstract description 11
- -1 fatty acid esters Chemical class 0.000 claims abstract description 11
- 230000008020 evaporation Effects 0.000 claims abstract description 9
- 238000001704 evaporation Methods 0.000 claims abstract description 9
- 239000002304 perfume Substances 0.000 claims abstract description 8
- 150000002314 glycerols Chemical class 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 16
- 239000003349 gelling agent Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 6
- 239000003205 fragrance Substances 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- 150000001735 carboxylic acids Chemical class 0.000 claims description 3
- 150000005690 diesters Chemical class 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 150000005691 triesters Chemical class 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 2
- 239000011159 matrix material Substances 0.000 claims 2
- 239000000499 gel Substances 0.000 abstract description 31
- 235000011187 glycerol Nutrition 0.000 abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000000654 additive Substances 0.000 description 9
- 230000000996 additive effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000002562 thickening agent Substances 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- BARWIPMJPCRCTP-CLFAGFIQSA-N oleyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCCOC(=O)CCCCCCC\C=C/CCCCCCCC BARWIPMJPCRCTP-CLFAGFIQSA-N 0.000 description 4
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 239000000679 carrageenan Substances 0.000 description 2
- 235000010418 carrageenan Nutrition 0.000 description 2
- 229920001525 carrageenan Polymers 0.000 description 2
- 229940113118 carrageenan Drugs 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000001877 deodorizing effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 150000004804 polysaccharides Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229940095095 2-hydroxyethyl acrylate Drugs 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 229920001817 Agar Polymers 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229920001938 Vegetable gum Polymers 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 239000008272 agar Substances 0.000 description 1
- 229940023476 agar Drugs 0.000 description 1
- 235000010419 agar Nutrition 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000000783 alginic acid Substances 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 229960001126 alginic acid Drugs 0.000 description 1
- 150000004781 alginic acids Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- OMRDZQXXMYCHBU-UHFFFAOYSA-N ethanol;propan-1-ol Chemical compound CCO.CCCO OMRDZQXXMYCHBU-UHFFFAOYSA-N 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical class CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000001814 pectin Substances 0.000 description 1
- 229920001277 pectin Polymers 0.000 description 1
- 235000010987 pectin Nutrition 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 229960000834 vinyl ether Drugs 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/015—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
- A61L9/04—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating
- A61L9/048—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating air treating gels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/01—Deodorant compositions
- A61L9/012—Deodorant compositions characterised by being in a special form, e.g. gels, emulsions
Definitions
- the current invention pertains to an improvement of gel-like deodorizing agents for household use, in particular to air fresheners.
- Air Fresheners are a commonly used means for deodorizing rooms to avoid unwanted odor. Such air fresheners may comprise a liquid, gel-like or solid composition, containing a perfume, which will evaporate into the air.
- a major problem in this regard is the rate of evaporation. If this rate is too high, the air freshener will quickly lose its capability to deodorize the air, which is not acceptable for the user. On the contrary, a slow rate of evaporation may cause too low a level of perfume in the air, which is also detrimental to the expectations of the customers.
- the problem of high evaporation rates is critical in particular with any liquid or gel-like compositions. Therefore, there is a constant need to provide perfume compositions, preferably in gel-form, which have an improved evaporation rate. BRIEF SUMMARY OF THE INVENTION
- the length of life of an air freshener is significantly increased by slowing the evaporation rate of the gel.
- An additive comprising a blend of alkoxylated partial fatty acid esters of glycerol and alkoxylated glycerol was identified, that when added to a regular gel formula extends the life of the gel by 2 to 3 times.
- Figure 1 shows a graph of air freshener longevity, recorded as weight remaining versus time in days, for a composition of the invention compared with a control composition.
- the invention is characterized by adding a selected additive to a gel-formulation containing a volatile substance to decrease the evaporation of the volatile substance from the gel.
- Gel-like air fresheners are known to the skilled person, for example from US 4, 178,264, pertaining to air- freshener gels, comprising carrageenan and a stearate salt as gelling or thickening agent.
- the compositions used in air- fresheners according to the current invention are aqueous gels.
- a gel in general is a jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state. By weight, gels are mostly liquid, yet they behave like solids due to a three-dimensional cross-linked network within the liquid.
- gels are a dispersion of molecules or particles within a liquid in which the solid is the continuous phase and the liquid is the discontinuous phase.
- gellants or “thickeners” which have the capability to create such a cross-linked structure.
- gellants are preferably selected from polymeric compounds, either of natural or synthetic origin.
- Polymeric gellants or thickeners could be selected from cationic, anionic or nonionic polymers.
- amphoteric polymers could be used.
- Preferred polymeric agents are cross-linked polyacrylic acid-type thickening agents.
- polyacrylic acid-type refers to water-soluble homopolymers of acrylic acid or methacrylic acid, or water-dispersible or water-soluble salts, esters or amides thereof, or water-soluble copolymers of these acids of their salts, esters or amides with each other or with one or more other ethylenically unsaturated monomers, such as, for example, styrene, maleic acid, maleic anhydride, 2-hydroxyethylacrylate, acrylonitrile, vinyl acetate, ethylene, propylene, and the like.
- homopolymers or copolymers are characterized by their high molecular weight, in the range of from about 500,000 to 10,000,000, preferably 500,000 to 5,000,000, especially from about 1 ,000,000 to 4,000,000, and also by their water solubility, generally at least to an extent of up to about 5 percent by weight, or more, in water at 25 °C.
- thickening agents are used in their lightly cross-linked form wherein the cross- linking may be accomplished by means known in the polymer arts, as by irradiation, or, preferably, by the incorporation into the monomer mixture to be polymerized of known chemical crosslinking monomeric agents, typically polyunsaturated (e.g. diethylenically unsaturated) monomers, such as, for example, divinylbenzene, divinylether of diethylene glycol, ⁇ , ⁇ '-methylene-bisacrylamide, polyalkenylpolyethers (such as described above), and the like.
- polyunsaturated (e.g. diethylenically unsaturated) monomers such as, for example, divinylbenzene, divinylether of diethylene glycol, ⁇ , ⁇ '-methylene-bisacrylamide, polyalkenylpolyethers (such as described above), and the like.
- the degree of cross-linking should be sufficient to impart some coiling of the otherwise generally linear polymeric compound while maintaining the cross-linked polymer at least water dispersible and highly water- swellable in an ionic aqueous medium.
- suitable types of gellants or thickeners are selected from polysaccharides like starches, vegetable gums, and pectin, or proteins.
- Preferred polysaccharide gellants are selected from the group alginic acid, agar and carrageenan.
- the gels which are commonly used as air-fresheners contain gellants or any mixture of different gellants, in amounts of 0.5 to 25 wt%, preferably of 1.0 to 10 wt% and most preferred from 1.5 to 5 wt%, based on the weight of the gel.
- the gels according to the invention show their gel-properties at room temperature (21 °C) at normal pressure.
- the gels contain water, wherein amounts of at least 75 wt%, or 85 wt% and more are common. A preferred range is from 85 to 98 wt% or from 90 to 96 wt% of water, based on the total weight of the gel. It is possible and preferred to use deionized or distilled water, but also tap water may be sufficient to provide the air-freshener gels.
- the gels contain a volatile substance, preferably selected from perfumes or fragrances. It is possible to select water-soluble and water-insoluble perfumes or fragrances or mixtures thereof. If water insoluble perfumes are used, the presence of emulsifiers or solubilizers is necessary.
- the core aspect of the present invention pertains to the additive, which is a blend of alkoxylated partial fatty acid esters of glycerol and alkoxylated glycerol.
- the fatty acid portion of the ethoxylated glycerol esters are preferably selected from saturated or unsaturated, linear or branched carboxylic acids with 8 to 22 C-atoms.
- Preferred acids contain from 10 to 18, and more preferably from 12 to 14 C-atoms.
- Acid mixtures, such as coconut carboxylic acids may be used with advantage.
- Such blends could be prepared by reacting glycerol fatty acids with alkoxylates.
- alkoxylates in the sense of the present invention means either ethylene oxide or propylene oxide.
- the glycerol alkoxylates contain only ethylene oxide moieties, however, mixed alkoxylates, containing both, ethylene oxide and propylene oxide (random or block-wise added) are also suitable.
- glycerol alkoxylates which contain from 2 to 20, preferably 3 to 9 moles of ethylene oxide or propylene oxide or both per mol of glycerol esters or moles of glycerol.
- the blend contains the alkoxylated partial fatty acids esters of glycerol and the alkoxylated glycerol in a weight ratio of 10 : 1 to 1 : 10, preferably 3 : 1 to 6 : 1 , and most preferably about 1 : 1.
- the blend may further optionally also contain alkoxylated fully esterified glycerol and/or glycerol.
- blends will be used in small amounts, preferably in the range from 0.5 to 5.0 wt% or more preferred from 1.0 to 2.0 wt%, based on the weight of the total gel.
- Such additives are commercially available, for example, Cetiol ® HE from the applicant, which is a preferred additive for use according to the present invention.
- the air freshener gel may contain small amounts of various optional ingredients.
- Such optional ingredients may include up to about 3.0 percent of silicone emulsion, up to about 3 percent of nonionic emulsifiers, up to about 1 percent of preservative and up to about 1 percent of pigment dispersions or water soluble dyes, as well as bacteriostats and the like.
- other common additives may be present, including dyes, organic or inorganic salts and/or pH-regulating agents. These additives may be present, if desired, in amounts from 0.5 to 5 % by weight.
- non-aqueous solvents are selected for example from short chain alcohols, including, but not limited to ethanol propanol, isopropanol, butanol, isobutanol, and glycol solvents, such as ethylene glycol, propylene glycol, and the like.
- solvents may be present in amounts of 1 to 15 wt% based on the weight of the gel.
- the preparation of the gels is possible using various means and methods known to those skilled in the art.
- the blend of glycerol derivatives according to the invention is added during or after the manufacturing process to obtain the desired effect.
- a further embodiment of the invention pertains to an aqueous gel composition, containing a gellant and at least 0.5 to 5.0 wt%, based on the total weight of the composition of a blend of ethoxylated partially esterified glycerol, and ethoxylated glycerol as described above.
- Two gel air freshener compositions have been prepared, one (Test) containing the inventive additive, the other one without it (Control).
- Weight loss data was measured over time (see Figure 1). Samples were stored at 23°C, 75% relative humidity. After 15 days, the control had lost 76.4% of its weight due to evaporation, while Test, with 1% wt. Cetiol ® HE, had lost only 49.2%. The control weight remaining after 6 days was less than the Test weight remaining after 15 days. Therefore, the longevity of the control formulation is more than doubled when 1 % wt. Cetiol ® HE is added.
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
Abstract
The use of a mixture of alkoxylated partial fatty acid esters of glycerol, and alkoxylated glycerols, in air freshener gels will reduce the evaporation rate of volatile perfumes and enhance the lifetime of the gels.
Description
Air Freshener Gel with Improved Longevity
FIELD OF THE INVENTION The current invention pertains to an improvement of gel-like deodorizing agents for household use, in particular to air fresheners.
BACKGROUND OF THE INVENTION Air Fresheners are a commonly used means for deodorizing rooms to avoid unwanted odor. Such air fresheners may comprise a liquid, gel-like or solid composition, containing a perfume, which will evaporate into the air. One major problem in this regard is the rate of evaporation. If this rate is too high, the air freshener will quickly lose its capability to deodorize the air, which is not acceptable for the user. On the contrary, a slow rate of evaporation may cause too low a level of perfume in the air, which is also detrimental to the expectations of the customers. The problem of high evaporation rates is critical in particular with any liquid or gel-like compositions. Therefore, there is a constant need to provide perfume compositions, preferably in gel-form, which have an improved evaporation rate. BRIEF SUMMARY OF THE INVENTION
It was a primary target of the present invention to provide a method to enhance the life time of air freshener gels. The length of life of an air freshener is significantly increased by slowing the evaporation rate of the gel. An additive comprising a blend of alkoxylated partial fatty acid esters of glycerol and alkoxylated glycerol was identified, that when added to a regular gel formula extends the life of the gel by 2 to 3 times. Other aspects of the invention will become apparent from the detailed description which follows.
P2011/003208
BRIEF DESCRIPTION OF THE DRAWING
Figure 1 shows a graph of air freshener longevity, recorded as weight remaining versus time in days, for a composition of the invention compared with a control composition.
DETAILED DESCRIPTION OF THE INVENTION
The invention is characterized by adding a selected additive to a gel-formulation containing a volatile substance to decrease the evaporation of the volatile substance from the gel.
Gel-like air fresheners are known to the skilled person, for example from US 4, 178,264, pertaining to air- freshener gels, comprising carrageenan and a stearate salt as gelling or thickening agent. The compositions used in air- fresheners according to the current invention are aqueous gels. A gel in general is a jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state. By weight, gels are mostly liquid, yet they behave like solids due to a three-dimensional cross-linked network within the liquid. It is the cross- linking within the fluid that gives a gel its structure (hardness) and contributes to stickiness (tack). In this way gels are a dispersion of molecules or particles within a liquid in which the solid is the continuous phase and the liquid is the discontinuous phase.
To obtain an aqueous gel it is necessary to combine the water with a substance, called "gellants" or "thickeners" which have the capability to create such a cross-linked structure. In particular such gellants are preferably selected from polymeric compounds, either of natural or synthetic origin. Polymeric gellants or thickeners could be selected from cationic, anionic or nonionic polymers. Also amphoteric polymers could be used. Preferred polymeric agents are cross-linked polyacrylic acid-type thickening agents. As used herein the term "polyacrylic acid-type" refers to water-soluble homopolymers of acrylic
acid or methacrylic acid, or water-dispersible or water-soluble salts, esters or amides thereof, or water-soluble copolymers of these acids of their salts, esters or amides with each other or with one or more other ethylenically unsaturated monomers, such as, for example, styrene, maleic acid, maleic anhydride, 2-hydroxyethylacrylate, acrylonitrile, vinyl acetate, ethylene, propylene, and the like.
These homopolymers or copolymers are characterized by their high molecular weight, in the range of from about 500,000 to 10,000,000, preferably 500,000 to 5,000,000, especially from about 1 ,000,000 to 4,000,000, and also by their water solubility, generally at least to an extent of up to about 5 percent by weight, or more, in water at 25 °C.
These thickening agents are used in their lightly cross-linked form wherein the cross- linking may be accomplished by means known in the polymer arts, as by irradiation, or, preferably, by the incorporation into the monomer mixture to be polymerized of known chemical crosslinking monomeric agents, typically polyunsaturated (e.g. diethylenically unsaturated) monomers, such as, for example, divinylbenzene, divinylether of diethylene glycol, Ν,Ν'-methylene-bisacrylamide, polyalkenylpolyethers (such as described above), and the like. Generally, those skilled in the art will recognize that the degree of cross-linking should be sufficient to impart some coiling of the otherwise generally linear polymeric compound while maintaining the cross-linked polymer at least water dispersible and highly water- swellable in an ionic aqueous medium. Further suitable types of gellants or thickeners are selected from polysaccharides like starches, vegetable gums, and pectin, or proteins. Preferred polysaccharide gellants are selected from the group alginic acid, agar and carrageenan.
The gels which are commonly used as air-fresheners contain gellants or any mixture of different gellants, in amounts of 0.5 to 25 wt%, preferably of 1.0 to 10 wt% and most preferred from 1.5 to 5 wt%, based on the weight of the gel. For the sake of clarity, it should
be stated that the gels according to the invention show their gel-properties at room temperature (21 °C) at normal pressure.
The gels contain water, wherein amounts of at least 75 wt%, or 85 wt% and more are common. A preferred range is from 85 to 98 wt% or from 90 to 96 wt% of water, based on the total weight of the gel. It is possible and preferred to use deionized or distilled water, but also tap water may be sufficient to provide the air-freshener gels.
Furthermore, the gels contain a volatile substance, preferably selected from perfumes or fragrances. It is possible to select water-soluble and water-insoluble perfumes or fragrances or mixtures thereof. If water insoluble perfumes are used, the presence of emulsifiers or solubilizers is necessary.
The core aspect of the present invention pertains to the additive, which is a blend of alkoxylated partial fatty acid esters of glycerol and alkoxylated glycerol. The fatty acid portion of the ethoxylated glycerol esters are preferably selected from saturated or unsaturated, linear or branched carboxylic acids with 8 to 22 C-atoms. Preferred acids contain from 10 to 18, and more preferably from 12 to 14 C-atoms. Acid mixtures, such as coconut carboxylic acids may be used with advantage.
Such blends could be prepared by reacting glycerol fatty acids with alkoxylates.^ or glycerol alkoxylates with fatty acidsi in the presence of catalysts, and under conditions well known to the skilled persons. The term "alkoxylates" in the sense of the present invention means either ethylene oxide or propylene oxide. In a preferred embodiment the glycerol alkoxylates contain only ethylene oxide moieties, however, mixed alkoxylates, containing both, ethylene oxide and propylene oxide (random or block-wise added) are also suitable.
It is preferred to use such glycerol alkoxylates which contain from 2 to 20, preferably 3 to 9 moles of ethylene oxide or propylene oxide or both per mol of glycerol esters or moles of glycerol.
In a preferred embodiment the blend contains the alkoxylated partial fatty acids esters of glycerol and the alkoxylated glycerol in a weight ratio of 10 : 1 to 1 : 10, preferably 3 : 1 to 6 : 1 , and most preferably about 1 : 1. The blend may further optionally also contain alkoxylated fully esterified glycerol and/or glycerol.
Those blends are well known, for example from European patent application number 1 106 675, the contents of which is hereby incorporated by reference. According to the teaching of this reference those blends contain
46 - 90 wt% of alkoxylated monoester,
9 - 30 wt% of alkoxylated diester, and
1 - 15 wt% of alkoxylated triester,
and may be used in the method of the present invention with advantage. The blends will be used in small amounts, preferably in the range from 0.5 to 5.0 wt% or more preferred from 1.0 to 2.0 wt%, based on the weight of the total gel.
Such additives are commercially available, for example, Cetiol® HE from the applicant, which is a preferred additive for use according to the present invention.
The air freshener gel may contain small amounts of various optional ingredients. Such optional ingredients may include up to about 3.0 percent of silicone emulsion, up to about 3 percent of nonionic emulsifiers, up to about 1 percent of preservative and up to about 1 percent of pigment dispersions or water soluble dyes, as well as bacteriostats and the like. Furthermore, other common additives may be present, including dyes, organic or inorganic salts and/or pH-regulating agents. These additives may be present, if desired, in amounts from 0.5 to 5 % by weight.
The use of one or more non-aqueous solvents is also possible. Such solvents are selected for example from short chain alcohols, including, but not limited to ethanol propanol, isopropanol, butanol, isobutanol, and glycol solvents, such as ethylene glycol, propylene glycol, and the like. Such solvents may be present in amounts of 1 to 15 wt% based on the weight of the gel.
The preparation of the gels is possible using various means and methods known to those skilled in the art. The blend of glycerol derivatives according to the invention is added during or after the manufacturing process to obtain the desired effect. A further embodiment of the invention pertains to an aqueous gel composition, containing a gellant and at least 0.5 to 5.0 wt%, based on the total weight of the composition of a blend of ethoxylated partially esterified glycerol, and ethoxylated glycerol as described above.
EXAMPLES
Two gel air freshener compositions have been prepared, one (Test) containing the inventive additive, the other one without it (Control). As gellant, a polysaccharide- comprising additive has been used.
Current gel formula (Control) Improved gel formula (Test)
% t %wt
Water 95.0 94.0
Gellant 2.0 2.0
Solvent 2.5 2.5
Fragrance 0.5 0.5
Cetiol® HE - 1.00
Weight loss data was measured over time (see Figure 1). Samples were stored at 23°C, 75% relative humidity. After 15 days, the control had lost 76.4% of its weight due to evaporation, while Test, with 1% wt. Cetiol® HE, had lost only 49.2%. The control weight remaining after 6 days was less than the Test weight remaining after 15 days. Therefore, the longevity of the control formulation is more than doubled when 1 % wt. Cetiol® HE is added.
Claims
1. A method for the reduction of the evaporation of volatile substances in a gel matrix, comprising the step of adding a blend of alkoxylated partial fatty acid esters of glycerol, and alkoxylated glycerol to the gel matrix.
2. The method according to claim 1 , wherein said volatile substance is selected from perfumes or fragrances.
3. The method according to claim 1 , wherein the blend contains the alkoxylated partial fatty acid esters of glycerol, and the alkoxylated glycerol in a weight ratio of 10 : 1 to 1 : 10.
4. The method according to claim 1 , wherein the blend contains the alkoxylated partial fatty acid esters of glycerol, and the alkoxylated glycerol in a weight ratio of 3 : 1 to 6 :
1.
5. The method according to claim 1 , wherein the blend further contains alkoxylated fully esterified glycerol.
6. The method according to claim 1 , wherein the blend further contains glycerol.
7. The method according to claim 1 , wherein the blend contains:
(a) 46 - 90 wt% of alkoxylated monoester,
(b) 9 - 30 wt% of alkoxylated diester, and
(c) 1 - 15 wt% of alkoxylated triester.
8. The method according to claim 1 , wherein the blend is added in amounts from 0.5 to 5.0 wt%.
9. The method according to claim 1, wherein the blend is added in amounts from 1.0 to 2.0 wt%.
10. The method according to claim 1, wherein the fatty acids are selected from saturated or unsaturated, linear or branched carboxylic acids having 8 to 22 C-atoms.
1 1. The method according to claim 1, wherein the alkoxylated compounds comprise ethoxylated and propoxylated derivatives.
12. The method according to claim 1, wherein the alkoxylated compounds comprise only ethoxylated derivatives.
13. An aqueous gel composition, containing a gellant and at least 0.5 to 5.0 wt%, based on the total weight of the composition, of a blend of ethoxylated partial fatty acid esters of glycerol, and ethoxylated glycerol.
14. The method of claim 3, wherein said weight ratio is about 1 : 1.
Applications Claiming Priority (2)
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US33801810P | 2010-09-30 | 2010-09-30 | |
US61/338,018 | 2010-09-30 |
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WO2012041411A1 true WO2012041411A1 (en) | 2012-04-05 |
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PCT/EP2011/003208 WO2012041411A1 (en) | 2010-09-30 | 2011-06-29 | Air freshener gel with improved longevity |
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Cited By (2)
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EP3431144A1 (en) | 2017-07-21 | 2019-01-23 | Procter & Gamble International Operations SA | Gels comprising a hydrophobic material |
EP3431143A1 (en) | 2017-07-21 | 2019-01-23 | Procter & Gamble International Operations SA. | Gels comprising a hydrophobic material |
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EP1696022A1 (en) * | 1996-10-18 | 2006-08-30 | Arizona Chemical Company | Ester-terminated polyamides gels |
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WO2007064854A2 (en) * | 2005-12-02 | 2007-06-07 | Whitehead Kenneth R | Aroma-releasing polymeric gel matrix |
WO2009149120A1 (en) * | 2008-06-03 | 2009-12-10 | Carlson Chris A | Smectic air freshener gels |
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US4178264A (en) | 1978-01-31 | 1979-12-11 | Airwick Industries, Inc. | Air treating gel composition |
EP1696022A1 (en) * | 1996-10-18 | 2006-08-30 | Arizona Chemical Company | Ester-terminated polyamides gels |
EP1106675A2 (en) | 1999-12-03 | 2001-06-13 | Cognis Deutschland GmbH | Use of partial glyceride polyglycol ethers |
US20060272199A1 (en) * | 2005-06-02 | 2006-12-07 | Bmc Manufacturing, Llc | Aqueous gel candle for use with a warming device |
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Publication number | Priority date | Publication date | Assignee | Title |
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EP3431144A1 (en) | 2017-07-21 | 2019-01-23 | Procter & Gamble International Operations SA | Gels comprising a hydrophobic material |
EP3431143A1 (en) | 2017-07-21 | 2019-01-23 | Procter & Gamble International Operations SA. | Gels comprising a hydrophobic material |
WO2019016706A1 (en) | 2017-07-21 | 2019-01-24 | Procter & Gamble International Operations Sa | Gels comprising a hydrophobic material |
WO2019016707A1 (en) | 2017-07-21 | 2019-01-24 | Procter & Gamble International Operations Sa | Gels comprising a hydrophobic material |
EP4159283A2 (en) | 2017-07-21 | 2023-04-05 | Procter & Gamble International Operations SA | Gels comprising a hydrophobic material |
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