Odor masking

Odor from contaminants or degradation products, instead of being scavenged (see above), may be masked by 

Plastic application materials such as cables are destroyed by animals and especially by rodents. Therefore, additives may be incorporated to eliminate potential damage to these materials. Additives of choice to repel rodents are substances with a bitter taste, for example, denatonium benzoate, with a spicy taste (capsaicin, hot pepper), and/or with an unpleasant odor for animals (Fig. 11.25). Other substances repel birds, for example, natural oils or methyl salicylate [69]. 

Identiflcation of polymers may be important for the manufacturer to establish the identity and the source and to differentiate own products from those of other suppliers (e.g., in the case of identifying the cause of damage) or to separate different polymers for recycling reasons. Target is the use of very small quantities of additives as markers or tracers. Proposed additives of choice may be fluorescent dyes [70], hapten compounds [71], or rare-earth metals [72] in the ppm range. 

Furthermore, modification of polymer properties through additives contributes decisively to the use of commodity plastics in demanding applications that have been the traditional field of engineering plastics. 

In a nutshell, plastic additives are and will be essential components in polymer formulations to support the further growth of plastics. Also they do and will provide innovative solutions for the resin producer and the plastic converter, and better value for the user of the plastic article. 

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Mashing-in Mashing-off Masking of odors Masks Masonite Mason number Masonry... 

Odor masking Odor modification Odor perception Odor removal... 

Fig. 2. Odor masking (a) how masking agents work, and (b) masking curve for tobacco odor, where ( ) is perceived odor strength (treated) (B) is...

VANILLIN is widely used as an ingredient in food flavors, as a pharmaceutical intermediate, and as a fragrance in perfumes and other odor masking products. 

Odor masking - [FLAVORS AND SPICES -FLAVORS] (Vol 11) - [ODORMODIFICATION] (Vol 17)... 

ODOR MASKING. Addition of a substance with strong odor to obtain a less-offensive effect without changing the composition of the original odorous substance. 

Odor masking does little or nothing to control malodors it merely covers them up. Many materials used in masking odors are aldehydes, which are very chemically reactive and usually comprise the top note of a fragrance. Odor masking is used in many areas of household, industrial, and institutional use via products that mask such malodors as pel smells, smoke, cooking, and numerous other odors. The forms by which masking is executed vary, and can be solid, liquid, and aerosol. 

Figure 1 Functions of enteric coatings according to the statements of the pharmaceutical manufacturer. 1, Taste masking 2, stability 3, protection against local irritation 4, drug release in specific parts 5, odor masking.

The second effect can greatly increase evaporation of a moderately volatile, moderately water-soluble pesticide. The pesticide will tend to be lost along with the water in the ratio present in the undisturbed soil water, not because of any peculiarity in the evaporation process but because the bulk flow of the solution up the capillaries is too fast for diffusion in the soil water to compete. Surface concentrations are automatically adjusted until evaporation occurs in the ratio supplied. A mixture of water, alcohols, ketones, etc., allowed to evaporate only from the top of a wick 30 mm. or more long, does so without any change of bulk composition. The phenomenon is exploited in the odor-masking devices sold. If excessively involatile constituents are avoided, any mixture can be evaporated automatically at constant composition if allowed to do so only through a wick. 

Use Menthol and camphor substitute, antifoaming agent, hydraulic fluids and textile soaps, odor masking, esterification agent, pharmaceuticals, wax additive, printing inks. 

The oils have an astonishing number of uses. They serve as flavoring in foods, as perfumes, as odor masks. They improve or disguise the taste of unpleasant drugs. They act as medicines, as starting materials for the synthesis of valuable chemicals. They perfume our soaps, make our dentifrices palatable, render our plastics inoffensive. One of them supplies the basic compound from which vitamin A is commercially synthesized. 

Emeressence . [Hentml/Emery] Aromatics for fiagranoe and odor masking tqjplics, as cosmetic preservatives. 

Sodyefresh. [Sandoz] Odor masking agent for dyebaths. 

USE As solvent in paint and lacquer industry in perfuming of soaps and detergents in technical odor masking. 

Emeressenc. [Hehlcel/Einety] Aromatics for fragrance and odor masking s )plics., as cosmetic preservatives. 

These alcohols and their esters have intense odors that play a role in wine aromas. The main higher fermentation alcohols, components of Fusel oils, are isobutyl (methyl-2-propanol-l) and amyl alcohols (a mixture of methyl-2-butanol-l and methyl-3-butanol-l). At low concentrations (less than 300 mg/1), they contribute to a wine s aromatic complexity. At higher levels, their penetrating odors mask the wine s aromatic finesse. Acetic esters of these alcohols, especially isoamyl acetate, have a banana odor that may play a positive role in the aroma of some young red wines (primeur or nouveau). 

Microcapsules with impermeable walls are used in products where isolation of active substances is needed, followed by a quick release under defined conditions. The effects achieved with impermeable microcapsules include separation of reactive components, protection of sensitive substances against environmental effects, reduced volatility of highly volatile substances, conversion of liquid ingredients into a solid state, taste and odor masking, and toxicity reduction. 

Chem. Descrip. Acrylic polymer org. sol n. in IPA/acetone Uses Excipient for controlled-release pharmaceutical applies., rapidly disintegrating coatings, taste- and odor-masking Properties Liq. soi. in gastric fiuid up to pH 5, swellable and permeable above pH 5 flash pt. -15 C 12.5% polymer Storage 36 mos min. shelf life < 30 C Eudragit E 100 [Rohm GmbH Rohm Am.]... 

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