Joseph F. Meier

Method utilizing ultrasonically induced cavitation to impregnate porous sheet passing through a resin bath

A method of impregnating a flexible, porous cellulosic sheet material involves passing the sheet through a low viscosity resin and across the resonant vibrating surface and through a cavitated zone in close proximity to at least one completely immersed ultrasonic wave generator, operating at a frequency and radiated power level effective to provide a combination vibratory pressure on the resin and cavitation effect causing degassing and heating of the resin, followed by passing the impregnated sheet through a drying means.

Organic particulate analysis of isocyanate compounds

Abstract The technique of Organic Particulate Analysis (OPA) has been employed to investigate the thermal decomposition of a series of isocyanate compounds; OPA measures the temperature at which particulate or aerosol matter is emitted from a heated organic substance. Of the eighteen isocyanate compounds investigated, seventeen showed strong organoparticulation activity below 200 °C. With the possible exception of four isocyanates, no obvious correlation exists between the OPA values and the melting or decomposition point of the compound. In an attempt to characterize the nature of the particulate matter derived from these compounds, mass-spectral data were obtained at thermoparticulation. Most of the massspectral particulate analyses showed the presence of very polar species (such as diethylamine) which were capable of exhibiting hydrogen-bonding properties. This hydrogen bonding gives rise to particulate matter of sufficient size to be detected by an ion chamber instrument. The ability of phenols to particulate, whereas thiophenols do not particulate, is discussed.

The Organic Particulate Thermal Analysis of Dithiocarbamate, Isocyanate and Cyanoethylated Compounds

Abstract The technique of Organic Particulate Thermal Analysis (OPTA) has been employed to investigate the thermal decomposition of a series of dithiocarbamate, isocyanate and cyanoethylated compounds; OPTA measures the temperature at which particulate or aerosol matter is emitted from a heated organic substance. Of the 22 compounds investigated, 15 showed strong organoparticulation activity below 200°C. With the possible exception of three compounds, no obvious correlation exists between the OPTA values and the melting or decomposition point of the compound. To explain the organoparticulation activity of these compounds, the hydrogen-bonding of polar, molecular species, present in the particulate matter, appeared necessary.