Abstract: Articles are formed from a thermosetting composition based on polybutadiene or polyisoprene resins which are subjected to a high temperature cure step of greater than 250° C. The thermosetting compositions may include fillers such as particulate ceramic fillers and may also include woven webs for improved dimensional stability and decreased brittleness. The formation process of this invention is particularly well suited for making electrical circuit substrates for microwave and digital circuits, typically in the form of the thermosetting composition being laminated on one or both opposed surfaces to metal conductive foil (e.g., copper).

Abstract: A forming process for producing a hard shaped molded article that includes subjecting a moldable thermosetting composition to a high temperature cure condition at a temperature greater than about 250.degree. C. and less than the decomposition temperature of the composition to form a crosslinked polymeric network. In particular, the invention features a forming process for producing a hard shaped molded article that includes the steps of(a) providing a moldable thermosetting composition that includes 1) a polybutadiene or polyisoprene resin which is a liquid at room temperature and which has a molecular weight less than 5,000 and a large number of pendent vinyl groups and 2) a solid butadiene- or isoprene-containing polymer (e.g, a thermoplastic elastomer);(b) forming the composition into a shape; and(c) curing the composition to produce the article including subjecting the composition to a high temperature cure condition at a temperature greater than about 250.degree. C.

Abstract: An auxiliary direct current electrical power source for protection of a wide variety of DC powered circuits, in particular those of computer systems, upon loss of commercial alternating current (AC) power, to sustain necessary or required functions for the full duration of the ordinary utility company AC power loss. The direct current power source will generally be one or more rechargeable gel cell batteries that are switched directly onto the protected device's internal DC power bus when a loss of AC power is sensed by the present invention. The switch to auxiliary power is inhibited if the protected device was in a manually turned off state at the time of AC loss. At the time of AC power restoral, a time delay ensures that the protected device's own internal power supply will be fully operational before the batteries are switched off the internal DC power bus.