Schott Glas

Schott Spezialglas Gmbh

Reiner Mauch

Andreas Weber

Marten Walther

Roland Buerkle

Dirk Schlatterbeck

Andreas Berndt

Inka Henze

Silke Deutschbein

Roland B&uuml;rkle

Karl-Heinz Sossenheimer

The invention relates to a glass-plastic composite film, especially for use in electronic components and devices, such as displays. The inventive film consists of a glass film which is between 10 &mgr;m and 500 &mgr;m thick, and is characterised in that a polymer layer with a thickness of between 1 &mgr;m and 200 &mgr;m f is applied directly to at least one of the side faces of said film and in that at least one side on the surface of the film has a waviness of less than 100 nm and a roughness R <30 nm.

Polymer-coated thin glass film substrates

A method of protecting a glass substrate, especially a display glass or a hard disk blank made from a glass or a glass-ceramic, from unacceptable surface damage and scratches, often leading to glass breakage, during processing and transport, is described. This protective method includes applying a removable protective coating made of at least one polymer layer, or at least one polyvinyl alcohol layer, to the glass substrates by spraying or rolling the polyvinyl alcohol or a polymer solution of the polymer to be applied in a polar organic solvent, onto the glass substrate, or dipping the substrate into it. Then when the substrate is ready for its end use, the protective coating is removed by washing in water or polar organic solution so that a residue does not remain on it. The glass substrates, protected in this manner have outstanding surface quality and improved hard disk blanks can be economically produced from them.

Method of protecting glass substrate surfaces

A method of protecting a surface of a display glass or a hard disk substrate during processing arid transport includes applying at least one polyvinyl alcohol or other polymer protective layer on the surface, which is soluble in polarorganic solvents, so that the layer can be removed after processing and transport by washing in heated water or a polar organic solvent without leaving residues on the surface. The polyvinyl alcohol used to make the protective coating has an average molecular weight of &gE; about 60,000 g/mol and a hydrolysis degree of &gE;95% and the at least one polyvinyl alcohol layer is dried by heating at temperatures of about 150&deg; C. or less to form the protective coating after applying the polyvinyl alcohol layer. The other polymers are less soluble in water than polyvinyl alcohol but are easily removed with organic solvent.

Method of protecting surfaces of glass substrates

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Ingelheim, Germany

Reiner Mauch