Abstract: A vehicle equipment rack and methods for removably holding equipment on a shelf that is removably and preferably releasably mounted within a vehicle. A hook bar assembly has a guide portion, and at least one sliding portion telescopically engaged with the guide portion. The hook bar assembly is attached to the shelf. Two end hooks are on distal longitudinally outward ends of the hook bar assembly, and each end hook is configured for hooking on a headrest post of the vehicle. The end hooks may have hooks that open forward, rearward, or outward and are biased with respect to each other. Preferably, a hook portion is releasably attached to the hook bar assembly for releasing in response to a laterally directed force.

Abstract: Thermoplastic compositions comprising polyacrylonitriles that contain greater than 90% acrylonitrile as monomer, or copolymers of such polyacrylonitriles with an olefinic unsaturated co-monomer, can be formed by the use of certain compatibilizers and/or thermal stabilizers. Other thermoplastic compositions comprising the high nitrile polyacrylonitriles can be obtained by melt blending the polyacrylonitriles with certain aromatic engineering thermoplastic polymers in the presence of compatibilizers and thermal stabilizers. All of the foregoing high nitrile compositions have been found to possess good optical and gas barrier properties, and good stress crack resistance.