Abstract: A fastener comprising a retainer and a collar wherein one or more sheets of material may be secured between the retainer and collar, and wherein the fastener may be weighted or attached to a variety of objects.

Abstract: A high solids polymerization process for producing a water-soluble polymer wherein a mixture of exothermically polymerizable material in water is cooled to produce a cold syrup or crystalline slurry of the polymerizable material in a polymerizable material/water solution and said syrup or slurry is initiated to polymerization wherein the reaction is controlled by absorbing the exothermic heat of polymerization employing the sensible heat and/or the latent heat of fusion of the cooled syrup or slurry as a heat sink. This polymerization process is capable of being carried out in a batch as well as a continuous process.

Abstract: A process for separating metal sulfide minerals from an ore containing metal sulfide minerals and silicate clays by subjecting the finely divided ore to anionic flotation using an anionic collector to produce a metal sulfide mineral concentrate containing silicate clay, separating the anionic collector from the concentrate and subjecting the concentrate to cationic flotation to selectively float silicate and produce as a residual product a metal sulfide mineral concentrate containing reduced amounts of silicate clay.