Sustained release air freshening device

a technology of air freshening device and suction tube, which is applied in the direction of thin material handling, disinfection, transportation and packaging, etc., can solve the problems of shrinkage, brittleness, cracking, etc., and achieve the effect of inhibiting cracking and splitting, minimizing shrinkage, and clear and transparen

Inactive Publication Date: 2008-11-27
ASHLAND LICENSING & INTPROP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]One advantage of the present invention is that it can be clear and transparent. Other commercially available fragrance storing compositions are typically opaque. Those commercially available fragrance storing compositions that tend to be somewhat transparent tend to have a yellow tint. Image bearing layers can be included in the device to display logos, messages, pictures, or aesthetically pleasing designs. Additionally, layers which can receive ink from a printer may also be affixed, thus allowing the consumer to personalize their own air freshener. The device may be selectively cut and shaped into aesthetically pleasing two or three dimensional forms. The present invention also minimizes shrinkage, thus inhibiting the cracking and splitting seen in other gel air fresheners due to the relatively high viscosity of the UV curable, oligomeric composition and its higher cross-link density.
[0019]The device may be mounted several different ways depending upon the environment and preference of the user. In one embodiment it may be hung from a mirror with either a gel reservoir or a paper blotter reservoir. In another embodiment the device is mounted to a window using a layer that can cling to the window using static cling. In yet another embodiment the device is adhesively attached to the window or another sufficiently flat surface within an automobile.
[0020]The duration of fragrance release from the device is dependant upon the choice of fragrance and carrier solvent combinations. Sustained release of a consistent amount of fragrance has been noted from between 30 to 45 days for various systems. As the technology is further developed it is anticipated that these release times will be extended. The regulation of the release of die fragrance also allows the device to minimize or potentially eliminate the fragrance “spike” present in other inventions, whereby the rate of release is initially very high and is dramatically reduced over time. This reduction in fragrance release requires frequent changing of air fresheners in order to keep a sufficient amount of fragrance available for odor masking or deodorizing.

Problems solved by technology

These deficiencies are typically observed as shrinkage, brittleness, and cracking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Hydroxyl-Functional Michael Adduct

[0054]Into a 1000 ml. cylindrical glass reactor were placed 41.94 g. (0.3223 mol.) ethyl acetoacetate, 41.17 g. (0.3545 mol.) 2-hydroxyethyl acrylate, 105.05 g. (0.3545 mol.) trimethylolpropane triacrylate, 1.98 g. (0.00614 mol.) tetrabutylammonium bromide catalyst, and 7.92 g. (0.0557 mol.) glycidyl methacrylate co-catalyst. The flask was fitted with a heating mantle and capped with a reactor cover fitted with a mechanical stirrer, thermometer, and reflux condenser. The reaction mixture was stirred and heated to 95° C. in one hour. The mixture was held at 95° C. and monitored by refractive index and viscosity (Brookfield CAP2000L cone and plate viscometer with Cone #06). After two hours, the refractive index reached 1.4816 (25° C.) and viscosity reached 53.5 poise at 25° C. (500 rpm, 30 sec). The reaction mixture was then cooled to 50° C. and the catalyst was quenched with 1.94 g. (0.00922 mol.) Ebecryl® 168 (UCB Chemicals). The fini...

example 2

Reaction of Michael adduct with Isocyanate-Capped Polybutadiene

[0055]The reactor containing the adduct of Example 1 (1846.6 g) was flushed and blanketed with dry air. To the reactor was added Krasol LBD 2000 (4616.4 g) (toluene diisocyanate polybutadiene prepolymer from Sartomer Company), dibutyltin dilaurate (3.9 g), hydroquinone (0.162 g) and 1,4 naphthoquinone (0.388 g). The mixture was heated with stirring to 80° C. over a one hour period. At the end the hour the pressure in the reactor was reduced 28 mm Hg while the temperature was held constant at 8° C. for 90 minutes. The reactor was brought back to atmospheric conditions. Dipropylene glycol (124.4 g) was added to the mixture. The contents of the reactor were allowed to stir for 30 minutes. A fragrance / solvent blend (3185.4 g) was then added to the reactor along with Irgacure 184 (193.6 g) and Genocure TPO (29.2).

[0056]Sample Preparation

[0057]Approximately 3.5 g of a 33% fragrance / solvent blend containing UV curable, liquid o...

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Abstract

This invention relates to a device that provides controlled release of a fragrant or deodorizing substance: the fragrant or deodorizing substance being solublized with an appropriate carrier solvent within a polymeric matrix. The layers function as protective barriers, semi-permeable membranes, fragrance reservoirs, and adhesives. The device is capable of delivering a fragrance at a controlled rate for a prolonged period of time through the gradual diffusion and release of fragrant material carried by a solvent from a reservoir system to the semi-permeable UV curable, oligomer composition acting a fragrance release regulator. Additionally, the UV curable, oligomeric composition that forms the reservoir and regulating layer can be engineered to be adhesive through cure inhibition. The method of cure inhibition can also be utilized to create internal areas of high and low cross link density to further control the release rate of a fragrance.

Description

[0001]This is a Continuation of U.S. application Ser. No. 10 / 967,448 filed on Oct. 18, 2004.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to a device that provides controlled release of a fragrant or deodorizing substance: the fragrant or deodorizing substance being solublized in a carrier solvent within a polymeric matrix. The device can be mounted in almost any location but it is primarily intended for use inside an automobile by hanging from a rearview mirror or adhering to a window or another substantially flat surface. The device can be transparent so as to be inconspicuous or to permit viewing of an image bearing layer or may be colored by methods known to those skilled in the art.[0004]2. Problems in the Art[0005]Modification of the odor of the surrounding air has long been accomplished through the use of fragrant materials or deodorizing agents to mask and even neutralize offending odors. Malodor has been shown to cause nausea, headac...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61L9/01
CPCA61L9/012Y10T428/1462A61L9/042Y10T428/249958
Inventor HUTCHINGS, DAVID ALLENFECHTER, ROBERT BERNARDTOPLIKAR, EDWARD GERARDHARVEY, RAYMOND SCOTTCASSIDY, ROBERT ANDREWLOCKWOOD, FRANCES ELLENSU, WEN-CHEN
Owner ASHLAND LICENSING & INTPROP LLC
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