Saint-gobain Ceramics & Plastics, Inc.

Certainteed Gypsum, Inc.

Ceriainteed Gypsum, Inc.

Saint-gobain Placo

Isaac K Cherian

Gaurav V Pattarkine

Gerald Boydston

Robert J Hauber

Brahmanandam V Tanikella

Ramanujam Vedantham

Nathan Frailey

Robert A Rizzuto

Severine Lamberet

Sergio Centurione

Anirban Ghosh

Matthew A Simpson

Abhaya Kumar Bakshi

John W College

Michael J Lemberger

Palaniappan Chinnakaruppan

Gerald D Boydston

Serigo Centurione

A composition and process for manufacture thereof used in hybrid inventive building materials comprising Syngenite (KCa(SO).HO) and Struvite-K (KMgPO.6HO). Starting constituents include magnesium oxide (MgO), monopotassium phosphate (MKP) and stucco (calcium sulfate hemihydrate), mixed in predetermined ratios, cause reactions to proceed through multiple phases, which reactions variously are proceeding simultaneously and in parallel. Variables, e.g., water temperature, pH, mixing times and rates, have been found to affect resultant reaction products. Preferred ratios of chemical constituents and manufacturing parameters, including predetermined weight percent and specified ratios of Struvite-K and Syngenite are provided for building products used for specified purposes. Reactions are optimized in stoichiometry and additives to reduce the combined heat of formation to non-destructive levels. Various additives help control and guide reactions. Building products, such as board panels, include the resultant composition. A significant amount of the composition is disposed adjacent a building panel face.

Struvite-K and syngenite composition for use in building materials

The present disclosure relates generally to building materials, such as building boards, having improved strength and reduced shrinkage. More particularly, the present disclosure provides building compositions comprising Struvite-K (KMgPO.6HO), Syngenite (KCa(SO).HO), and one or more silicate additives suitable for use in building materials.

Struvite-K/Syngenite building compositions comprising silicate materials and building articles such as wallboards made therefrom

Struvite-K and Syngenite composition for use in building materials

A composition and process for the manufacture thereof for use in a hybrid building material comprising at least in part Syngenite (KCa(SO).HO) and Struvite-K (KMgPO&#xb7;6HO). Specified constituents, including magnesium oxide (MgO), monopotassium phosphate (MKP) and stucco (calcium sulfate hemihydrate) are mixed in predetermined ratios and the reaction proceeds through multiple phases reactions which at times are proceeding simultaneously and in parallel and reaction may even compete with each other for reagents if the Struvite-K reaction is not buffered to slow down the reaction rate). A number of variable factors, such as water temperature, pH mixing times and rates, have been found to affect resultant reaction products. Preferred ratios of chemical constituents and manufacturing parameters, including predetermined and specified ratios of Struvite-K and Syngenite may be provided for specified purposes, optimized in respect of stoichiometry to reduce the combined heat of formation to non-destructive levels.

A sapphire substrate includes a generally planar surface having a crystallographic orientation selected from the group consisting of a-plane, r-plane, m-plane, and c-plane orientations, and having a nTTV of not greater than about 0.037 &#x3bc;m/cm, wherein nTTV is total thickness variation normalized for surface area of the generally planar surface, the substrate having a diameter not less than about 9.0 cm.

Sapphire substrate

A composition and process for the manufacture thereof for use in a hybrid building material comprising at least in part Syngenite (KCa(SO).HO) and Struvite-K (KMgPO.6HO). Specified constituents, including magnesium oxide (MgO), monopotassium phosphate (MKP) and stucco (calcium sulfate hemihydrate) are mixed in predetermined ratios and the reaction proceeds through multiple phases reactions which at times are proceeding simultaneously and in parallel and reaction may even compete with each other for reagents if the Struvite-K reaction is not buffered to slow down the reaction rate). A number of variable factors, such as water temperature, pH mixing times and rates, have been found to affect resultant reaction products. Preferred ratios of chemical constituents and manufacturing parameters, including predetermined and specified ratios of Struvite-K and Syngenite may be provided for specified purposes, optimized in respect of stoichiometry to reduce the combined heat of formation to non-destructive levels.

Improved slurry compositions comprising silicon carbide particles and alumina particles dispersed within an aqueous medium. Slurry compositions in the form of abrasive slurry compositions for use chemical mechanical planarization (CMP) processes, particularly abrasive slurry compositions for polishing of sapphire, and methods of use.

Composite slurries of nano silicon carbide and alumina

Improved silicon carbide particles, improved silicon carbide abrasive particles, and abrasive slurry compositions for use chemical mechanical planarization (CMP) processes. The particles can comprise nano-sized silicon carbide particles, particularly silicon carbide particles having a surface chemistry similar to silica.

Abrasive particles comprising nano-sized silicon carbide particles surface-coated with silica, and methods using same

Sapphire substrates and methods of making same

Improved slurry compositions comprising a mixture of a first type of particles and a second type of abrasive particles dispersed within an aqueous medium, and abrasive slurry compositions for use chemical mechanical planarization (CMP) processes, particularly abrasive slurry compositions for polishing of sapphire. These abrasive slurry compositions comprise a mixture of a first type of abrasive particles having a hardness that is harder than the surface being polished and a second type of abrasive particles have a hardness that is softer than the surface being polished, particularly mixtures of silicon carbide abrasive particles and silica abrasive particles, dispersed within an aqueous medium.

Growing community of inventors

Shrewsbury, MA, United States of America

Isaac K Cherian