Abstract: What is disclosed is an improved method of preparing silicon carbide which is characterized by the preparation of a specific pre-silicon carbide polymer. The method allows the preparation of silicon carbide from specific polysilane polymers without the cumbersome extractions and purifications found in the newer methods of silicon carbide preparation.

Abstract: What is disclosed are new alumina-containing organosilicon resins which are useful as corrosion inhibiting coatings on metal substrates. One such useful composition is a combination of 2.5 weight percent alumina; 87.1 weight percent CH.sub.3 SiO.sub.3/2 and 10.3 weight percent colloidal silica in an aqueous-alcoholic solution at about twenty percent solids.

Abstract: Pre-polymers which are aminated methylpolysilanes are useful for the preparation of fine grained silicon carbide ceramic materials and silicon carbide-containing ceramics. The pre-polymers exhibit ease of handling and their use to obtain silicon carbide ceramic materials results in high yields.

Abstract: Novel, high yielding prepolymers are prepared by reducing chloropolysilanes with lithium aluminum hydride. These prepolymers exhibit good handling properties and are useful for preparing ceramics, silicon carbide ceramic materials and articles containing silicon carbide.

Abstract: What is disclosed is an improved method of preparing silicon carbide which is characterized by the preparation of a specific pre-silicon carbide polymer. The method allows the preparation of silicon carbide from specific polysilane polymers without the cumbersome extractions and purifications found in the newer methods of silicon carbide preparation.

Abstract: Pre-polymers which are substituted with (CH.sub.3).sub.3 SiO-groups are useful for the preparation of fine grained silicon carbide ceramic materials. The pre-polymers exhibit ease of handling and their use to obtain silicon carbide ceramic materials results in high yields.

Abstract: Pre-polymers which are alkoxylated or phenoxylated methylpolysilanes are useful for the preparation of fine grained silicon carbide ceramic materials and silicon carbide-containing ceramics. The pre-polymers exhibit ease of handling and their use to obtain silicon carbide ceramic materials results in high yields.

Abstract: Pre-polymers which are alkylated or arylated methylpolysilanes are useful for the preparation of silicon carbide ceramic materials. The pre-polymers exhibit ease of handling and their use to obtain silicon carbide ceramic materials results in high yields.

Abstract: A pigment-free coating composition comprising an acidic dispersion of colloidal titania, colloidal silica and hydroxylated silsesquioxane in an alcohol-water medium. A coating of the composition cured on a plastic substrate such as polycarbonate results in a hard, abrasion-resistant protective coating. Such coatings transmit visible light, but absorb wavelengths of ultraviolet light which cause degradation of the substrate surface and resultant adhesion-loss of the protective coating upon weathering. A cured coating of these compositions deposited on metal substrates such as aluminum results in a hard, abrasion resistant coating which offers slightly more corrosion protection than such a composition without colloidal titania.

Abstract: Abrasion resistant siloxane resins having a low degree of organic substitution thereby tending to be brittle can be made flexible by including some degree of phenyl substitution into the organic substitution.

Abstract: A composition of matter which is an aqueous dispersion of an organothiolsilsesquioxane and colloidal silica is used as an adhesion additive for siloxane resins which have a low degree of substitution.

Abstract: Abrasion resistant siloxane resins having a low degree of organic substitution thereby tending to be brittle can be made flexible by including some degree of phenyl substitution into the organic substitution.

Abstract: Abrasion resistant siloxane resins having a low degree of organic substitution thereby tending to be brittle can be made flexible by including some degree of phenyl substitution into the organic substitution.

Abstract: A composition of matter which is an aqueous dispersion of an organothiolsilsesquioxane and colloidal silica is used as an adhesion additive for siloxane resins which have a low degree of substitution.

Abstract: Compositions comprising certain acrylate-containing polyorganosiloxanes and a hydroperoxy polymerization initiator are anaerobically curing sealant compositions. For example, a composition comprising a polyorganosiloxane consisting essentially of 42 mole percent trimethylsiloxane units and 58 mole percent methacryloxypropyl silsesquioxane units and cumene hydroperoxide remained uncured for several days in the presence of oxygen but cured to a solid, insoluble sealant when placed on the threads of an iron bolt and a nut was threaded onto the bolt.

Abstract: Pre-polymers which are alkoxylated or phenoxylated methylpolysilanes are useful for the preparation of fine grained silicon carbide ceramic materials and silicon carbide-containing ceramics. The pre-polymers exhibit ease of handling and their use to obtain silicon carbide ceramic materials results in high yields.