摘要:
Extruded polystyrene foams are made with an added brominated styrene-butadiene polymer as a flame retardant. The blowing agent is a mixture of carbon dioxide, ethanol and water, which may also contain a C4-C5 hydrocarbon. The blowing agent mixture overcomes a tendency of the brominated styrene-butadiene to form very small cells. This allows the foam to expand fully to form good quality, low density extruded foam.
摘要:
Phosphorus-sulfur compounds have flame retardant activity in organic polymer systems. The phosphorus-sulfur compounds can be represented by the structure: wherein X is oxygen or sulfur, T is a covalent bond, oxygen, sulfur or nitrogen, provided that at least one of X and T is sulfur, each X′ is independently oxygen or sulfur, each m is independently zero or 1 when X′ is oxygen and zero, 1 or 2 when X′ is sulfur, n is at least 1 and preferably at least 2, each R is independently an unsubstituted or inertly substituted hydrocarbyl group or the R groups together form an unsubstituted or inertly substituted divalent organic group and A is an organic linking group.
摘要:
Phosphorus-sulfur compounds have flame retardant activity in organic polymer systems. The phosphorus-sulfur compounds can be represented by the structure: wherein X is oxygen or sulfur, T is a covalent bond, oxygen, sulfur or nitrogen, provided that at least one of X and T is sulfur, each X′ is independently oxygen or sulfur, each m is independently zero or 1 when X′ is oxygen and zero, 1 or 2 when X′ is sulfur, n is at least 1 and preferably at least 2, each R is independently an unsubstituted or inertly substituted hydrocarbyl group or the R groups together form an unsubstituted or inertly substituted divalent organic group and A is an organic linking group.
摘要:
A concrete article comprised of concrete having therein a reinforcing fiber, where at least about 50 percent of the reinforcing fibers are frayed only at an end or ends of the reinforcing fibers, may be made by mixing concrete, water and a reinforcing fiber for a sufficient time to fray the ends of at least 50 percent of the fibers and curing the mixture to form the concrete article. The fiber may be a reinforcing fiber comprised of at least two filaments bonded together and the filaments being comprised of a polymeric core and a polymeric sheath comprised of a fusing-fraying polymer, such that the reinforcing fiber, when mixed with inorganic particulates, frays predominately only at an end or ends of the fiber.
摘要:
A concrete article is prepared by mixing concrete, water and a reinforcing polymer comprised of a substantially random interpolymer of at least one &agr;-olefin, with at least one vinyl or vinylidene aromatic monomer and curing said concrete mixture to form a concrete article having the reinforcing polymer therein, such that the reinforcing polymer has a surface comprised of the substantially random interpolymer in contact with the concrete.
摘要:
A magnetic recording medium, comprising a substrate, a magnetic recording lamina and at least one sulfonamide wherein the at least one sulfonamide is present in an amount sufficient to provide desirable tribological properties. A process for lubricating magnetic recording media comprising applying at least one sulfonamide to a surface of the magnetic recording media or incorporating at least one sulfonamide into the lamina of the magnetic recording media.
摘要:
In one respect, this invention is a lubricating composition which comprises a polyaryl ether lubricating fluid and an additive which is (a) cesium carbonate, (b) cesium phosphate, or (c) a benzoate of cesium, rubidium, or lithium wherein the additive is present in the lubricating composition in an amount effective to produce an antioxidative effect in the lubricating composition. In another respect, this invention is a process for reducing the rate of oxidation in a polyaryl ether lubricating fluid which comprises adding an additive wherein the additive is (a) cesium carbonate, (b) cesium phosphate, or (c) a benzoate of cesium, rubidium, or lithium to the polyaryl ether lubricating fluid in an amount effective to produce an antioxidative effect in the lubricating composition.
摘要:
A new lubricant comprises at least one compound having a perfluorocyclobutane group, preferably a perfluorovinyl aryl ether. The lubricant is conveniently applied from solvents which are not chlorofluorocarbons and is effective at high temperatures e.g., in engines and for magnetic media, either internally or topically.
摘要:
A magnetic recording media containing a lubricant which is a cyclic phosphazene completely substituted with fluorinated phenoxy substituents and m-perfluoroalkylphenoxy substituents, in ratios ranging from 1:1 to 1:5 is disclosed. The recording media and lubricant are particularly useful for advanced, high density magnetic recording media.