Abstract: An adhesive composition comprising a low molecular weight fluorine-containing elastomer and fibrillated polytetrafluoroethylene, which is excellent in chemical resistance and weather resistance.

Abstract: A melt-molded foamed plastic composition comprised of a tetrafluoroethylene-perfluoroalkyl vinyl ether resin matrix in which is admixed stretched porous fragments of polytetrafluoroethylene.

Abstract: Fluorinated allylisocyanurates are extremely efficient gelling agents for fluoroelastomers. Blends of fluorinated allylisocyanurate gelled fluoroelastomers with non-gelled fluoroelastomers have improved processability as compared with non-gelled fluoroelastomers and blends of other gelled fluoroelastomers with non-gelled fluoroelastomers.

Abstract: The green strength of elastomer blends of natural or synthetic cis-1,4-polyisoprene and synthetic elastomers is improved by adding to the chain of the synthetic elastomer an ionogenic compound. The said ionogenic compound can be incorporated into the chain of the synthetic elastomer through conventional polymerization with the monomers forming the synthetic elastomer, and the ionogenic group of the compound will be pendant from the chain or backbone of the elastomer. The ionogenic group is combined with a readily ionogenic metal base or salt. This combination yields blends which have greatly improved green strength as compared to rubber blends known to the art.

Abstract: Blends of PTFE and perfluorinated ether copolymers of TFE and perfluoro(propyl vinyl ether) provide coating compositions which have reduced crystallinity and useful lives superior to what would be expected from averaging the properties of the unblended resins themselves.

Abstract: Elastomer compositions comprising an elastomer gum curable to the solid, elastomeric state in the presence of an organic peroxide free radical initiator, a solid particulate filler, a hydrocarbon resin having a plurality of pendant vinyl groups per molecule, and an organic peroxide curative are described. Vulcanizates of such compositions are also described. Preferred are elastomer compositions comprising a fluoroelastomer gum curable to the solid, elastomeric state in the presence of an organic peroxide cure initiator and a carbonaceous filler coated with a 1,2-polybutadiene resin. Solid particulate fillers coated with a hydrocarbon resin having a plurality of pendant vinyl groups per molecule, such as 1,2-polybutadiene, are also described.

Abstract: A co-crosslinkable blend composition which comprises an iodine-containing fluoroelastomer, an elastomer crosslinkable in the presence of a peroxy radical and an organic peroxide.

Abstract: Novel hot melt adhesives comprise a fluoroelastomer, an ethylene copolymer and a tackifier. Preferably the adhesive contains 20 to 40% by weight of the fluorocarbon elastomer, 40 to 60% by weight of the ethylene copolymer and 10 to 30% by weight of the tackifier. The adhesives will bond well to a wide variety of substrates, including substrates of low surface energy such as partially fluorinated polymers, even after prolonged exposure to high temperatures.

Abstract: Certain fluoropolymers, when chemically modified by reacting them with sulfur or phosphorus containing compounds, become hydrophilic materials useful for making ion-exchange membranes, especially diaphragms for electrolytic cells, particularly chlor-alkali cells used in the production of chlorine, hydrogen and sodium hydroxide from brine.

Abstract: A primer coating containing, as the resin binder, a thermoplastic halogenated (at least partly fluorinated) ethylene polymer and a curable epoxy resin, and, as a filler pigment, finely-divided mica and metallic pigment powder, is disclosed herein. The primer coating gives fluoropolymer top coatings which have been simultaneously cured therewith unexpectedly high resistance to blistering and delamination when exposed to extreme conditions such as live steam under high pressure.

Abstract: Copolymers of vinylidene fluoride with at least one other fluorinated- ethylenically unsaturated monomer are press-cured at about 163.degree.-204.degree. C. by crosslinking with an aromatic polyhydroxy compound in the presence of an accelerator in a weakly basic system, at least a portion of the polyhydroxy compound being blocked by conversion to acetal or thioacetal groups. At the press-cure temperature some of the acetal or thioacetal groups are decomposed and the free hydroxyl groups are reformed, thus providing crosslinking capability. The remainder of acetal or thioacetal groups are decomposed during post-cure oven heating at a higher temperature, and under those conditions copolymer vulcanization is completed. Press-cured compositions of this invention have excellent hot tensile elongation, which permits easy demoldability; and very good recyclability, which eliminates or reduces fluoropolymer waste. The compositions of this invention also have excellent mold flow properties at press-cure temperature.

Abstract: Ion-exchange films, membranes and laminar structures incorporating a layer of a blend of a first fluorinated polymer which contains sulfonyl groups in ionizable form and a second fluorinated polymer which contains carboxylic acid functional groups, when used to separate the anode and cathode compartments of an electrolysis cell, permit operation at high current efficiency and low power consumption. They can be made by synthesis of precursor polymers in melt-fabricable form, blending, fabrication of the film, membrane or laminar structure, and hydrolysis of the functional groups to ionizable form, such as the free acid form or alkali metal salt thereof.