摘要:
A two coat adhesive system containing an undercoat having a flexibilizer, a phenolic resin, and an acid; and, a covercoat containing an aqueous phenolic resin, and an aqueous butadiene polymer latex prepared by emulsion polymerization of at least one butadiene monomer in the presence of a polyvinvyl alcohol.
摘要:
Disturbances in circadian rhythms of bodily performance and function, as may occur for example in transfer of work patterns from day to night-shift, or rapid crossing of several time zones in an aircraft ("jet lag") are treated by administration of melatonin. Alleviation or prevention of ill effects associated with disturbance of circadian rhythms is achieved by administration of melatonin in specified ways which are varied to suit particular needs and circumstances.
摘要:
An electricity supply network has plural switching and transformer stations connected together by cables. Each cable has an inner conductor and an outer sheath connected to housings of the stations. A communication system has plural transducers coupled to the cables at the stations. Each of the transducers is located on a side of its respective cable remote from a sheath connection of the respective cable to its station housing. Each transducer is coupled to both the sheath and the conductor of its respective cable.
摘要:
A process for the preparation of 4,4'-isopropylidene bis(2,6-dibromophenol), also known as tetrabrombisphenol A, that dramatically reduces the formation of alkyl bromide by-products. Bisphenol A is brominated with a C.sub.3 to C.sub.5 n-alcohol in a water mixture to suppress the formation of alkyl bromides. The bisphenol A is brominated between 15.degree. C. and 25.degree. C. and then heated at a 55.degree. C. to 70.degree. C. to insure bromination is complete. The tetrabrombisphenol A is then filtered from the reaction mixture and dried. Tetrabromobisphenol A produced from this process typically has a melting point of 180.degree. C. or higher, and is typically greater than 98% pure. Hydrogen peroxide is optionally combined with the reactants to reduce the amount of added bromine necessary for the bromination of the tetrabromobisphenol A.