Corning Glass Works

Serge A Renault

Francoise M Roger

Serge P Goepfert

Jean-Pierre Themont

Andre Jean Vachet

Serge Guy Marsaud

Paul Mouchikhine

Marius Charles Boitel

Rudolph Holecek

This invention is concerned with a method for preparing transparent laminated polarizing glass articles consisting of a support of an inorganic or organic glass, a coating exhibiting polarizing properties disposed on one of the surfaces of the support, and an optically transparent layer adhered to the coating which protects the coating from humidity. The vital feature of the method comprises a first treatment by a gamma-aminopropyltrialkoxysilane and a second treatment by an epoxyalkyltrialkoxysilane which is designed to improve the adherence of the optically transparent layer to the polarizing coating. The invention is especially useful in the fabrication of eyeglass lenses.

Transparent laminated polarizing glasses

This invention concerns an improved method for fabricating transparent laminated polarizing glasses consisting of a substrate of inorganic or organic glass, a coating of polarizing properties deposited upon one surface of the substrate, and an integral, optically transparent composite film consisting, on the one hand, of one lamina of thermoplastic polyurethane of adhesive properties, and, on the other hand, of one lamina of thermosetting polyurethane of anti-lacerative and self-regenerating properties; the thermoplastic polyurethane ply adhering to the polarizing coating. The method comprises applying the polarizing coating to the substrate, then treating at least the coated surface of the substrate with a aqueous solution containing .gamma.-aminopropyltrimethoxysilane or .gamma.-aminopropyltriethoxysilane, and thereafter applying said composite film.

Method of making transparent polarizing laminated glasses

A method of tinting a sheet of transparent polyurethane comprising a coloring operation followed by a fixation operation. The aforesaid coloring operation is carried out through immersion of the polyurethane into a bath maintained under continuous agitation and formed of a dispersion of one or several colorants in an aqueous solution containing a surfactant or wetting agent, while the aforesaid fixation operation is carried out through rinsing in a boiling aqueous solution of sodium alkyl sulfonate of the type known under the mark 'Teepol'. The application to a double or composite sheet preformed to a thin laminate, that is to say, one layer of a thermoplastic polyurethane and one other layer of a thermosetting polyurethane. In a particularly useful embodiment of the invention the tinted polyurethane serves as a selective filter having almost zero transmission in the so-called cutoff range of wavelengths lying between about 350-560 nm. Eyeglasses made from such lenses are useful for victims of aphakia and retinitis pigmentosa.

Method for tinting a sheet of polyurethane

Glass or glass-ceramic vessels are formed with a pouring lip wherein wall portions of the vessel below the lip are of a thinner construction than the remaining wall portions so as to impede glass flow to the lip area and facilitate uniform glass flow to upper portions of the vessel during the forming process.

Method of forming a vessel with pouring lip

The invention relates to glass-ceramics. It concerns a process to obtain sensibly colorless transparent glass-ceramics from a glass-ceramic composition containing more than 0.50 weight % titanium dioxide and possibly iron oxide, that would normally provide colored glass-ceramics; this process is characterized by incorporating into the said composition an appropriate proportion of neodymium oxide so as to make the glass-ceramic sensibly colorless. Application to the manufacture of diverse articles.

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Montigny-Sur-Loing, France

Serge A Renault