Abstract: High-surface-area polyolefins grafted with certain fluoroalkylvinylether sulfonate or carboxylate monomers, and their method of preparation, are disclosed. Such materials are usefuli as catalysts and as membranes in electrochemical cells.

Abstract: Water-buoyant compositions comprising a source of micronutrients for photosynthetic phytoplankton growth are useful for stimulating photosynthetic phytoplankton growth in ocean areas devoid of such growth when deployed on ocean surfaces as floating particles. Iron is the preferred micronutrient.

Abstract: High-surface-area polyolefins grafted with certain fluoroalkylvinylether sulfonate or carboxylate monomers, and their method of preparation, are disclosed. Such materials are useful as catalysts and as membranes in electrochemical cells.

Abstract: Process for preparing an ultrahigh molecular weight linear polyethylene (UHMWLPE) by heating the material to above 280.degree. C. at atmospheric pressure in an inert environment. The treated polymer is then gradually cooled in this same atmosphere.

Abstract: The invention provides shaped, substantially unoriented, compositions of PTFE, having high notched Izod impact resistance, produced in a hot compression molding process wherein heat and pressure are applied simultaneously in a selected temperature range below the melting point of the virgin, as polymerized PTFE powder.

Abstract: Novel ultrahigh molecular weight linear polyethylene (UHMWLPE) in the form of a shaped article, exhibiting a unique combination of properties making the material useful as a bearing surface, in general, but particularly useful as a prosthetic hip joint cup and as other prosthetic shapes for replacement of other joints of the human body, A novel process for preparing this article is also disclosed.

Abstract: What is provided is an annealed, linear, high density polyethylene (LHDPE) and a process for the preparation of tough impact resistant articles made of such materials.

Abstract: Shaped PTFE compositions are disclosed having low creep which are produced by the application of pressure and elevated temperature. Also disclosed is a process for making shaped compositions with low creep by the application of pressure and elevated temperature.

Abstract: What is provided is an annealed, linear, high density polyethylene (LHDPE) and a process for the preparation of tough impact resistant articles made of such materials.

Abstract: Ceramic compositions comprising a distillable binder, shaped articles formed therefrom and a method for making said compositions and for forming the shaped articles.

Abstract: Polyacrylonitrile is chemically modified with HX (Cl, Br, I, CF.sub.3 SO.sub.3 H) to produce a polymer with readily replaceable X groups. The modified polyacrylonitrile is useful as an immobilization substrate for, e.g.

Abstract: This invention relates to vessel for high pressure and optionally high temperature processes. More specifically it relates to a pressure vessel having a non-threaded plug, the vessel being useful as a chemical reactor and for polymer processing at high pressures and optionally elevated temperatures.

Abstract: A homogeneous composite is provided comprising (a) about 0.5 to 90% by weight of an ultrahigh molecular weight linear polyethylene having a molecular weight of at least about 400,000, a crystalline melting point of greater than 143.degree. C., the reduction of said melting point upon remelting being at least 3.degree. C., and a crystal morphology comprising a bimodal distribution of molecular chain fold spacings reflecting significant populations of both folded and very highly extended molecular chains, and (b) about 0.5 to 90% by weight of at least one filler compound having a neutral-to-acidic surface, said polyethylene being polymerized onto the surface of said filler, and said composite being substantially free of polymer-free filler and of filler-free polymer. Also provided are processes for the preparation of such composites.

Abstract: This invention relates to polyolefin composites, and to processes for drying fillers and catalytically-active fillers for use in preparing homogeneous polyolefin composites.

Abstract: The invention provides high impact resistant heat formable composites comprising an addition polymer or copolymer, a metal oxide or metal carbonate filler and oriented thermoplastic elastomeric fibers.

Abstract: A process for preparing an ultrahigh molecular weight linear polyethylene (UHMWLPE) exhibiting a combination of properties including a creep resistance of less than 1% demonstrated under exposure to a temperature of 23.degree. C. (+ or -1.degree. C.) and a relative humidity of 50 (+ or -2% for 24 hours under a compression of 1000 psi) without sacrificing excellent tensile and flexural properties. The invention includes the use of an inert gas and a prescribed pattern of heating and cooling including a further heat and cooling treatment to create the superior properties of the UHMWLPE. Also included is the product of the process invention.

Abstract: An aqueous solution of precursors for biologically active glass, support particles coated with the solution, support particles coated with the glass, spheroidal particles of biologically active glass, processes for making the solution, coating the support, and for making the coated support and the spheroidal glass particles. The materials that comprise the biologically active glass are useful in prosthetic devices and implants for the human body.

Abstract: A composite consisting essentially of a polymer matrix and thermoplastic elastomeric fibers is disclosed. During preparation, elastomeric fibers are embedded in polymer or polymer precursor under from about 0 tension to tension only sufficient to eliminate slack and develop tension as the composite is formed. The composite is impact resistant and capable of elongation.

Abstract: Compounds having the formula: ##STR1## where X is F or Cl, and a process for the preparation of such compounds.

Abstract: An aqueous solution of precursors for biologically active glass, support particles coated with the solution, support particles coated with the glass, spheroidal particles of biologically active glass, processes for making the solution, coating the support, and for making the coated support and the spheroidal glass particles. The materials that comprise the biologically active glass are useful in prosthetic devices and implants for the human body.