Abstract: A medical utensil having a portion to contact body fluid or liquid medicine is provided in which at least the contact portion is formed of a copolymer cross-linked by electron beam irradiation and/or .gamma.-ray irradiation.

Abstract: A liquid separating agent used for fractionating a liquid such as blood that contains more than one component of different specific gravities, by separating a specific component from other components by means of the specific gravity difference is characterized by consisting of as the main component an .alpha.-olefin-dialkylmaleate copolymer having a viscosity between 10,000 and 80,000 cp (at 25.degree. C.); a viscosity and specific gravity adjusting agent such as silica or clay; and wax, a surfactant and so on as required.

Abstract: A film of a crosslinked high molecular substance is obtained by irradiating radioactive rays or an electron beam to a solution introduced into a mold. The solution contains an oligomer prepared from a hydroxy monomer selected from the group consisting of hydroxy lower alkyl acrylate, hydroxy lower alkyl methacrylate, hydroxy lower alkyoxy lower alkyl acrylate and hydroxy lower alkoxy lower alkyl methacrylate, and a styrene-based oligomer selected from the group consisting of homooligomer of styrenes and cooligomer of styrenes with unsaturated dicarboxylic acids.

Abstract: This invention provides a liquid separating composition containing as a base material a liquid polymer of hydrocarbon or derivatives thereof having a viscosity ranging from 100 to 20,000 CP at 20.degree. C., suitable amounts of additives for adjusting the specific gravity and viscosity of the composition and a netword former for imparting a thixotropic property to the composition. This invention also provides an apparatus for applying a liquid separating composition, comprising a vessel filled with a liquid separating composition, and a cannula fixed to the vessel, for piercing into a rubber cap of a liquid container.The liquid separating composition is transferred to the liquid container by centrifuging the apparatus connected to the liquid container.

Abstract: This invention provides a liquid separating composition containing as a base material a liquid polymer of hydrocarbon or derivatives thereof having a viscosity ranging from 100 to 20,000 CP at 20.degree. C., suitable amounts of additives for adjusting the specific gravity and viscosity of the composition and a network former for imparting a thixotropic property to the composition. This invention also provides an apparatus for applying a liquid separating composition, comprising a vessel filled with a liquid separating composition, and a cannula fixed to the vessel, for piercing into a rubber cap of a liquid container.The liquid separating composition is transferred to the liquid container by centrifuging the apparatus connected to the liquid container.