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Oxygenated Solvents from Dow Offer Coatings Formulators Non-HAPs, Low VOC, Cost-Effective Alternatives

Published on 2004-10-28. Author : SpecialChem

The Dow Chemical Company's Oxygenated Solvents business will feature its UCAR™ n-Alkyl Propionates, as well as its improved DOWANOL* PnB and PnP-series glycol ethers, at the International Coatings Expo this week in Chicago.

UCAR n-Alkyl Propionates

The UCAR n-Alkyl Propionates family includes UCAR n-Propyl Propionate, UCAR n-Butyl Propionate and UCAR n-Pentyl Propionate. These three products encompass a range of evaporation rates - from fast to slow - making them suitable for a variety of applications. Typical applications for coatings formulated with alkyl propionates are automotive refinish, OEM, and general industrial (can, marine, appliance, etc.) coatings.

The UCAR n-Alkyl Propionates are not listed as Hazardous Air Pollutants (HAPs) under Title III of the Clean Air Act. As a result, they are finding increased use as coatings manufacturers reformulate to meet recent and forthcoming EPA Maximum Achievable Control Technology (MACT) Standards.

The strong solvency, high electrical resistivity, low surface tension, low photochemical reactivity, and the relative evaporation rates of UCAR n-Propyl, n-Butyl and n-Pentyl Propionate make them ideal candidates for use in high solids-compliant coatings. Their strong solvency results in excellent viscosity reduction, high solids and lower VOC formulations.

The low photochemical reactivity of the propionates, as measured by the Maximum Incremental Reactivity (MIR) scale, makes them excellent candidates for compliance with recent regulations in California establishing VOC limits based upon reactivity. High electrical resistivity provides the formulation latitude to attain excellent transfer efficiency and wrap-around for electrostatic spray-applied coatings. Low surface tension provides improved substrate and pigment wetting action. UCAR n-Propyl, n-Butyl and n-Pentyl Propionates also have lower odor threshold values than acetate esters, such as n-butyl acetate or oxo-hexyl acetate, as well as many ketones.

Formulating Versatility

UCAR n-Propyl Propionate is a fast evaporating ester that may replace xylene, butyl acetate, isobutyl acetate, MIBK, t-butyl acetate, V&PM naphtha, or ethyl acetate. It has an extremely low odor and provides effective viscosity reduction.

UCAR n-Butyl Propionate is a moderately fast evaporating ester that may replace xylene, MAK, MIAK, cyclohexanone, MAAc, and PCBTF. It exhibits stronger solvency and appropriate volatility for high-solids coatings and printing ink applications, and high electrical resistivity for electrostatically-sprayed coatings.

UCAR n-Pentyl Propionate is a slow evaporating ester that has found widespread use as a replacement for Exxate™ 600. In addition, it may replace DBE, 2-ethylhexyl acetate and diacetone alcohol. Its linear structure provides enhanced diffusion during film formation, which results in improved surface appearance. Its high boiling point makes it an excellent polymerization medium for high-solids acrylic resins. Resin solutions prepared in UCAR n-Pentyl Propionate have low molecular weights, narrow molecular weight distributions, lower viscosities, and excellent clarity.

Low Odor DOWANOL PnB and PnP Glycol Ethers

Recent process improvements have resulted in a lower odor profile for Dow's DOWANOL PnB and PnP glycol ethers. Resin manufacturers, coatings formulators and coatings applicators use these products in protective coatings for industrial, automotive, and architectural applications. The "enhanced" DOWANOL PnB and PnP products will have expanded use in the architectural coatings industry, where there is an increasing requirement for low-odor products.

Dow is a leader in science and technology, providing innovative chemical, plastic and agricultural products and services to many essential consumer markets. With annual sales of $33 billion, Dow serves customers in more than 180 countries and a wide range of markets that are vital to human progress, including food, transportation, health and medicine, personal and home care, and building and construction, among others. Committed to the principles of sustainable development, Dow and its approximately 46,000 employees seek to balance economic, environmental and social responsibilities. References to "Dow" or the "Company" mean The Dow Chemical Company and its consolidated subsidiaries unless otherwise expressly noted.

*Trademark of The Dow Chemical Company

Source: Dow

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