Eastman-kodak Company

Ferro Corporation

Steven A Ferranti

Jose M Mir

Edward Carnall, Jr

Laurie A Strom

Karla Marie Goff

Edward Carnall,Jr

Dana L Zagari

LeVern G Burm, Jr

Lauri A Strom

The present invention provides a slurry composition and method for polishing organic polymer-based ophthalmic substrates. The slurry composition according to the invention includes an aqueous dispersion of abrasive particles and a pyrrolidone compound. The abrasive particles can be alumina, zirconia, silica, titania or combinations of the foregoing. Slurry compositions according to the invention can be used to polish all types of organic polymer-based ophthalmic substrates, but are particularly useful for polishing organic polymer-based ophthalmic substrates having an index of refraction greater than 1.498 because they remove such materials at a greater efficiency than conventional slurry compositions without detrimentally affecting the quality of the resulting surface.

Slurry composition and method for polishing organic polymer-based ophthalmic substrates

The present invention provides an aqueous slurry composition that comprises cerium oxide and/or cerium oxide-containing mixed rare earth oxide abrasive particles, a polyacrylate, and an agent that retards hard settling. The agent that retards hard settling is preferably a polysaccharide such as xanthan gum, microcrystalline cellulose and/or sodium alginate, the latter of which may be treated with a divalent metal salt such as calcium carbonate. The slurry composition according to the invention can be used to polish glass and glass ceramics at a high removal rate, but does not hard settle upon extended static conditions and can be easily resuspended. The present invention also provides a method of polishing a glass or glass ceramic substrate using the slurry composition.

Slurry composition and method of use

A process of forming on a substrate a coating of a precursor of a crystalline rear earth alkaline earth copper oxide or heavy pnictide mixed alkaline earth copper oxide electrical conductor and converting the precursor to the crystalline electrical conductor. The coating precursor is provided by (a) preparing a solution comprised of a volatilizable solvent and, as a solute, metal-ligand compounds of each of the metals forming the crystalline electrical conductor, the proportions of the solute metals corresponding to those present in the precursor coating and the ligands being inorganic ligands chosen to be volatilizable on heating, (b) spraying the aqueous solution to form discrete liquid particles each containing the metals as metal-ligand compounds in proportions corresponding to those present in the precursor coating, (c) evaporating at least a portion of the volatilizable solvent from the liquid particles to form solid particles each containing the metals as metal-ligand compounds in proportions corresponding to those present in the precursor coating. The solid particles can be formulated as a screen printing composition to facilitate coating on the substrate.

Process for preparing superconductive thick films

A process of forming on a substrate a coating of a precursor of a crystalline rare earth alkaline earth copper oxide or heavy pnictide mixed alkaline earth copper oxide electrical conductor and converting the precursor to the crystalline electrical conductor. The coating precursor is provided by (a) preparing a solution comprised of a volatilizable solvent and, as a solute, metal-ligand compounds of each of the metals forming the crystalline electrical conductor, the proportions of the solute metals corresponding to those present in the precursor coating and the ligands being inorganic ligands chosen to be volatilizable on heating, (b) spraying the aqueous solution to form discrete liquid particles each containing the metals as metal-ligand compounds in proportions corresponding to those present in the precursor coating, (c) evaporating at least a portion of the volatilizable solvent fronm the liquid particles to form solid particles each containing the metals as metal-ligand compounds in proportions corresponding to those present in the precursor coating. The solid particles can be formulated as a screen printing composition to facilitate coating on the substrate.

Thick film circuit elements are disclosed comprised of an insulative substrate selected from the group consisting of strontium titanate, magnesia, alumina, and aluminum nitride, and providing a conductive path between at least two locations on the substrate, a crystalline rare earth alkaline earth copper oxide layer exhibiting a superconducting onset transition temperature in excess of 77.degree. C. comprised on an R.sub.1 A.sub.2 C.sub.3 crystalline phase.

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Rochester, NY, United States of America

Steven A Ferranti