Abstract: In a process for preparing homo- or co-polymer of ethylene, in which ethylene alone or mixed with one or more other unsaturated organic compounds capable of forming a copolymer with ethylene is subjected to a high pressure and a high temperature in a reactor in the presence of an initiator or a catalyst, in which the mixture of polymer and unconverted monomer discharged out of the reactor is expanded to, practically, atmospheric pressure with the aid of an expansion device in two or more steps, and in which the polymer present in the expanded mixture is separated from the mixture in the solid state, the improvement which comprises obtaining the polymer in a fibrous form by supplying the mixture to the last stage of the expansion device at such a pressure and temperature that, during the expansion, in this last stage, the polymer passes from the liquid phase to the solid phase.

Abstract: A process is provided for manufacturing heat resistant polymeric film. A concentrated polymer composition containing solvent is provided, which composition is a solid at room temperature. The composition comprises (a) a polymer having in the repeating units thereof a member selected from the group consisting of precursor units which on heat curing form heterocyclic rings, and a mixture of said precursor units and heterocyclic rings formed from said precursor units and (b) 25-130% by weight of an organic solvent for said polymer, the composition being a solid at room temperature.According to the process, the solid composition is heated to a temperature above room temperature and is extruded into film at this high temperature to form film at a temperature above room temperature and below the curing temperature of the polymer.

Abstract: Water-insoluble, water-swellable fibers adapted to bind aqueous fluids such as body exudates are prepared by spinning fibers from an organic solvent solution of a copolymer of maleic anhydride with suitable vinyl aromatic monomers. The copolymer solution also contains a small amount of a polyfunctional cross-linking agent such as an adduct of glycerine with ethylene oxide and propylene oxide which reacts to cross-link and plasticize the copolymer chains when the fibers are heated and dried. The cross-linked copolymer fibers are then rendered hydrophilic and water-swellable by reaction with ammonia.

Abstract: The facile extrusion of ethylene oxide resins has been effected by employing water as an extrusion aid.

Abstract: Hollow membrane fibers are formed from a mixture of N-alkoxyalkyl polyamide, polyvinyl alcohol, di(lower alkyl) sulfoxide and water. The fibers are useful for separating chemicals, e.g., aliphatically-unsaturated hydrocarbons, from mixtures containing them.