The B. F. Goodrich Company

Dane E Jablonski

Angelo J Magistro

Joseph A Cowfer

Ronald M Kovach

Dual cure site acrylate elastomers containing both active halogen and carboxyl groups are compounded with a combination of 2,5-dimercapto-1,3,4-thiadiazole, a Group IVA metal oxide or salt thereof and a tetraalkyl thiuram sulfide to provide compounds having an excellent scorch/cure rate balance and balance of desirable physical properties in the vulcanizates thereof.

Vulcanizable compositions of halogen and carboxyl containing acrylate

Dual cure site acrylate rubbers having both carboxyl and active halogen groups are compounded with a combination of sodium stearate and a tetramethyl thiuram disulfide or a Group IB, IIB, IVA, VA, and VIA metal compound thereof to provide compounded acrylate rubbers having an excellent scorch/cure rate balance and desirable physical properties in the vulcanizates thereof.

Vulcanizable acrylate rubber compositions

Dual cure site acrylate rubbers having both carboxyl and active halogen groups are compounded with a combination of 2,3-dimercapto-1,3,4-thiadiazole and a Group IB, IIB, IVA, VA, or VIA metal compound of a tetraalkyl thiuram sulfide to provide compounded acrylate rubbers having an excellent scorch/cure rate balance and desirable physical properties in the vulcanizates thereof.

Acrylate rubber compositions

A method is disclosed for using a pendulum viscometer having damped torsional oscillations, in a laboratory catalytic fluid-bed reactor, to monitor a propensity to stick which is exhibited by certain supported catalysts. A fluid-bed of such catalysts has been found to become suddenly more sticky just before a point at which a change in pressure drop across the fluid-bed can be measured due to a process 'upset'. At this point ('the inversion point'), the upset is usually irremediable. The method includes correlating data on catalyst stickiness from a laboratory reactor operating at atmospheric pressure, with an expected level of catalyst stickiness in a commercial reactor operating at elevated pressure. A pendulum viscometer and related auxiliary apparatus is disclosed for magnetically and electrically measuring and recording the rate at which the pendulum's torsional oscillations are damped. Frequent measurements are made during normal operation of the fluid-bed to determine its stickiness (as evidenced by the rate at which the pendulum's torsional oscillations are damped) relative to the stickiness at the inversion point. Operation of the fluid-bed under conditions for which measured rates of damping are predeterminedly lower than the rate near the inversion point, assures operation of the fluid-bed reactor at maximum efficiency.

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Brunswick, OH, United States of America

Dane E Jablonski