Schott Glaswerke

Gerhard Tuenker

Helmut Schmidt

Nanning J Arfsten

Helmut Dislich

Gottfried Philipp

Optical blanks, for example spectacle lenses, are produced by hot-blank pressing or injection molding of polyorganoheterosiloxanes which are obtainable by hydrolytic polycondensation of at least one titanium-, zirconium-or tin-compound, at least one organofunctional silane and, where applicable, at least one inorganic oxide component. For control of the optical characteristics and working properties, polyorganoheterosiloxanes which have a polymerizable organic radical may be modified by additional polymerization with other copolymerizable condensates or monomers.

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Wuerzburg, Germany

Gerhard Tuenker