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 Insect repellent prepared from cellulosicsUSPTO Application #: 20070032400Title: Insect repellent prepared from cellulosics Abstract: The present invention provides a process for optimizing the fragrance of a scented cellulosic. (end of abstract)
Agent: Darby & Darby P.C. - New York, NY, US Inventors: Adam Bell, Mohamed Mohamed, Robert Zwick, James Blumenfeld USPTO Applicaton #: 20070032400 - Class: 512001000 (USPTO) Related Patent Categories: Perfume Compositions, Perfume Compositions The Patent Description & Claims data below is from USPTO Patent Application 20070032400. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims the benefit of U.S. Provisional Application No. 60/739,304, filed Nov. 23, 2005, U.S. Provisional Application No. 60/705,807, filed Aug. 4, 2005, and U.S. Provisional Application No. 60/692,644, filed Jun. 20, 2005. Each of these applications are hereby incorporated by reference in their entirety. FIELD OF THE INVENTION [0002] The present application provides scented cellulosics that can be used for various end-use applications including, personal accessories, scented point-of-purchase applications, and promotional items for fine fragrances. BACKGROUND OF THE INVENTION [0003] Various applications that employ plastics (e.g., cellulosics) could be enhanced if the plastics could exude a pleasing or appropriate fragrance based on their end use. [0004] U.S. Pat. No. 5,460,787 discloses a scented card which includes a fragranced thermoplastic material. The process of producing the scented card includes, providing a dry particulate thermoplastic material, blending a chemical flowing agent and at least one fragrance into the thermoplastic material to form a mixture, and heating the mixture in a thermoplastic extruder. The chemical flowing agent creates gas pockets within which the fragrance is trapped. [0005] U.S. Pat. No. 3,661,838 discloses a scented plastic composition having a porous, finely divided silica powder having absorbed thereon a liquid scent emitting substance that is contained within the plastic material. The patent states that previous attempts have been made to dissolve a liquid scent-emitting substance into the liquid plasticizer, and a mixture of the scent emitting substance and plasticizer is subsequently added to the resin followed by heating and solidification. According to the patent, the liquid scent emitting substances which are dissolved in the plasticizers under known processes evaporate or decompose due to the processing heat applied during the time of the heat melting process, and do not provide sufficient fragrance intensity. [0006] U.S. Published Patent Application No. 2003/0072733 discloses cellulose acetates as absorbent materials in a process for absorbing moisture and/or malodor in providing a fragrance to the surrounding ambience. The cellulose acetate and cellulose butyrate is not plasticized nor is a process provided for providing a fragrance plastic product. [0007] U.S. Pat. No. 6,703,012 discloses compositions containing fragrances and powdered water-soluble polymers that are processed into toilet blocks. Polyvinyl acetates and mixtures of polyvinyl alcohol in partially hydrolyzed polyvinyl acetate are used. The fragrance is introduced into the extruder and the time of extruding the polymer. [0008] U.S. Pat. No. 4,492,644 discloses and ethylene and vinyl acetate copolymer used with a perfume. The ethylene-vinyl acetate copolymer is pre-formed into granules having a diameter of about one to ten millimeters. A perfume and granulated copolymer are mixed at a temperature in a range of about ten degrees Celsius. This patent states that the granulated ethylene-vinyl acetate copolymer containing the perfume may increase in volume according to the amount of the perfume impregnated and absorbed therein, but it will never exhibit a softening effect. The '644 patent is not directed to cellulose acetate esters, such as cellulose acetate, cellulose acetate butyrate, and cellulose acetate propionate. [0009] U.S. Pat. No. 4,598,006 discloses a method for impregnating a thermoplastic polymer with a fragrance by dissolving the fragrance in a volatile swelling agent maintained at or near super-critical conditions for the volatile swelling agent, swelling the thermoplastic polymer by contacting it at or near the supercritical conditions of the volatile swelling agent, then reducing the pressure so that the volatile swelling agent diffuses out of the thus impregnated thermo-plastic polymer. The thermoplastic polymer swells upon contact with the fragrance at or near supercritical conditions. The contacting permits rapid diffusion of the impregnation material into the polymer. Swelling agents include carbon dioxide, ethylene and nitrous oxide. [0010] There is a need for imparting fragrance to cellulosics, including cellulose acetate, cellulose acetate butyrate, and cellulose acetate propionate, that has sufficient fragrance intensity while minimizing the amount of fragrance used, and also avoids compromising the plastic by the addition of silica materials or the addition of extraneous components to create formation voids within the plastic. There is a further need to optimize the fragrance of a cellulosic either by process improvements or additives so that end-use products that are made of the fragranced cellulosic have an optimal fragrance amount and are appealing to the consumer. BRIEF SUMMARY OF INVENTION [0011] The present application provides a process for preparing scented cellulosic with optimal fragrance intensity, including the steps of determining an amount of net plasticizer to be added to a pre-melt cellulosic composition; selecting a high preliminary fragrance:plasticizer weight ratio of the net plasticizer; adding the net plasticizer with the high preliminary fragrance:plasticizer ratio; determining the fragrance:plasticizer weight ratio of net plasticizer that achieves maximum fragrance intensity in the processed scented cellulosic by decreasing the fragrance:plasticizer ratio of the net plasticizer in iterative trials; and selecting a final fragrance:plasticizer ratio based on the desired fragrance intensity of the scented cellulosic, whereby the final fragrance:plasticizer ratio is less than or equal to the fragrance:plasticizer ratio that achieves the maximum fragrance intensity. [0012] The present invention also provides a scented cellulosic composition comprising a cellulosic, a plasticizer, a fragrance component, and a solvent system that comprises a component that has both a non-polar and polar character. In one embodiment, the solvent system comprises, or consists essentially of, a glycol or a glycol ether, such as but not limited to, hexylene glycol, propylene glycol, butyl carbitol, 2-butoxyethanol (ethylene glycol mono-n-butyl ether) or pentyl ethylene glycol. In a preferred embodiment, the solvent system comprises hexylene glycol. BRIEF DESCRIPTION OF THE DRAWINGS [0013] FIG. 1 is a conceptual drawing of the fragrance profile of a scented cellulosic having varying weight ratios of fragrance:plasticizer. DETAILED DESCRIPTION Definitions [0014] As used herein and in the appended claims, the singular forms "a," "an," and "the," include plural referents unless the context clearly indicates otherwise. Thus, for example, reference to "a plasticizer" includes one or more of such plasticizers, and reference to "the method" includes reference to equivalent steps and methods known to those of ordinary skill in the art that could be modified or substituted for the methods described herein. [0015] The term "cellulosic", as used herein, refers to cellulose acetates and cellulose acetate esters and includes, but is not limited to, cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate. Cellulose acetate esters include, but are not limited to, cellulose diacetate and cellulose triacetates. The term "cellulosic" also includes all hydrates of cellulosics (e.g. anhydrous cellulose acetate, cellulose acetate monohydrate, cellulose acetate dihydrate, cellulose acetate trihydrate, and cellulose acetate tetrahydrate) as well as anhydrous forms of cellulosics. [0016] The term "optimal fragrance intensity", as used herein, refers to a fragrance intensity of scented cellulosic which is obtained using a minimum amount of fragrance for the given fragrance intensity. For example, each point of the Odor Intensity--Fragrance loading curve shown in FIG. 1 that is to the left of Point C (including Point C itself) is an optimal fragrance intensity. In contrast, point B in FIG. 1 is not an optimal fragrance intensity, even though it has the same odor intensity as point A (which is an optimal fragrance intensity), since it is not obtained with a minimum amount of fragrance. If the intensity of the emitted fragrance decreases upon selecting a lower fragrance:plasticizer ratio, then the scented cellulosic has an optimal fragrance intensity. Under these circumstances, the ratio of fragrance:plasticizer can be increased until a fragrance:plasticizer weight ratio is obtained that achieves the maximum fragrance intensity in the scented cellulosic. For purposes of this application, a scented cellulosic with optimal fragrance intensity also has an amount of fragrance that yields an optional fragrance longevity since both intensity and longevity are functions of the diffusion of the fragrance through the cellulosic. [0017] The term "pre-melt cellulosic", as used herein, refers to the unprocessed cellulosic starting material that is to be mixed with a plasticizer and processed with one or more extrusion or processing techniques. The pre-melt cellulosic is provided in solid powdered form with uniform particle distribution, as opposed to a liquid or gel. In preferred embodiments, the pre-melt cellulosic is processed to provide fragranced cellulosics for end-use applications, particularly end-use applications with structural form. [0018] The term "maximum fragrance intensity" as used herein refers to the maximum odor intensity possible for a cellulosic. The maximum fragrance intensity of FIG. 1 is point C. Continue reading... Full patent description for Insect repellent prepared from cellulosics Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Insect repellent prepared from cellulosics patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Insect repellent prepared from cellulosics or other areas of interest. ### Previous Patent Application: Thickened fabric conditioners Next Patent Application: Macrocyclic musks Industry Class: Perfume compositions ### FreshPatents.com Support Thank you for viewing the Insect repellent prepared from cellulosics patent info. 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