Evonik Degussa Gmbh

Matt Romaine

James Toth

Mario Scholz

Karl Meier

Christian Panz

Guido Titz

James J Toth

New gel coat composition, in particular new marine gel coat compositions, a process for their manufacture as well as their use to coat surfaces of articles exposed to light, water and solvents. The gel coats incorporate a precipitated silica having

Gel coat formulation

A precipitated silica having a d-value of from 150 to 2000 nm, a d-value of from 500 to 7000 nm, a silanol group density of from 2.5 to 8 OH/nm, and a modified tapped density of less than or equal to 70 g/l is useful for thickening and providing thixotropy in liquid systems and shows superior efficiency at thickening and creating thixotropy compared to existing grades of precipitated silica. The precipitated silica functions best as a thixotrope in non-polar or intermediate polar liquid systems such as unsaturated polyester (UPE) resin systems.

Precipitated silica for thickening and creating thixotropic behavior in liquid systems

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Franklin Park, NJ, United States of America

Matt Romaine