Abstract: Polymers or copolymers of acid anhydride type norbornene derivatives and a method of preparing the same, said polymers or copolymers being formed with a reduced viscosity of 0.1 to 20 by ring-opening polymerization of acid anhydride type norbornene derivatives having at least one carboxylic anhydride group or a mixture of said norbornene derivatives and cycloolefins.

Abstract: Primary-aliphatic-.alpha.-hydroxyazo-alkanes having the structure: ##STR1## wherein R is hydrogen or a hydrocarbon radical containing 1 to 18 carbon atoms;R.sup.1 is the same as R except R.sup.1 is not hydrogen;R.sup.2 is the same as R except R.sup.2 is neither hydrogen, aryl, nor alkaryl;R.sup.1 and R.sup.2 can together form an alkylene diradical;R, r.sup.1 and R.sup.2 may be optionally substituted with the same or different groups.The compounds of the invention are more stable than the corresponding tertiary aliphatic-alpha-hydroxyazoalkanes. The compounds of the invention are useful as foaming agents for polyester resins and initiators for free radical polymerization of vinyl monomers.

Abstract: An improvement in a process for the preparation of thermoplastically workable fluoro-polyolefins and their copolymers wherein a fluorine containing olefin is polymerized or copolymerized in the aqueous phase in the presence of a water-soluble, radical-forming catalyst and a polymerization regulator, the improvement residing in employing as the polymerization regulator a halogenated hydrocarbon having from one to three carbon atoms and at least three halogen atoms of which at least one is a fluorine atom and at least one is a bromine or iodine atom.

Abstract: A novel oil- and water-repellent composition which comprises a copolymer of at least 25 weight percent of a fluoroalkyl monomer and an alkylvinyl ether having the formula: CH.sub.2 =CH-OR wherein R represents a halogen substituted lower alkyl group.

Abstract: Particle size is increased and particle size range is decreased, e.g. narrower particle size distribution obtained of very tiny inorganic catalyst fines, (particles), particularly olefin catalysts by working these fines with very small quantities of polytetrafluoroethylene (PTFE) powder in order to trap the fines in a web of PTFE submicroscopic fibers.

Abstract: This invention relates to a composition comprising a copolymer of ethylene and a halogenated comonomer selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene and mixtures thereof and 0 to 10 mol percent of an additional monomer selected from the group consisting of 3,3,3-trifluoro-2-trifluoromethyl propene, a vinyl monomer which is free of telogenic activity and which provides a side chain having at least two carbon atoms, said side chain being aromatic or having its elements bonded together by a single bond only, or mixtures thereof, and containing from about 1 to about 40% by weight of an oxide of cobalt, nickel, manganese, chromium, tin, molybdenum, tungsten or mixtures thereof. Such compositions are particularly useful as a primer coating for substrates such as metals in conjunction with an overlying layer of such copolymers.

Abstract: Finely divided polytetrafluoroethylene molding powder is disclosed having a remarkable combination of high apparent density and high moldability, the latter being reflected as a small difference in specific gravity (.DELTA.SG) of standard moldings molded at high and low preform pressures. For example, molding powders having an average particle diameter (d.sub.50) of no greater than 60, a .DELTA.SG.sub.5.sub.-1 of no greater than 30 and apparent density of at least 600 g/l are disclosed. These molding powders are obtained from unique process steps involving either the fine powder type of polytetrafluoroethylene or the granular type of polytetrafluoroethylene as the starting material. The fine powder type is compacted to a high degree, followed by partially decompacting the resultant compacted fine powder to the molding powder particle size desired.

Abstract: Polyhydroxy-cured vinylidene fluoride fluoropolymer is reclaimed by masticating the polymer to at least the stage of initial break-down of the cured polymer network, treating the masticated polymer with hot concentrated nitric acid to cause the polymer to swell and then removing the acid. The polymer is suitably an elastomer and may be scrap polymer.

Abstract: The mono- or diester of phosphoric acid and a straight chain alkanol of 8 to 10 carbon atoms is used as a surfactant in the emulsion polymerization of olefinic compounds, especially vinyl compounds, to obtain polymers having improved stability to light and heat.

Abstract: Conjugated diolefinic polymers having a molecular weight of less than 1,000,000 can be produced at high polymerization rates and in high yields by polymerizing a conjugated diolefin or copolymerizing a conjugated diolefin with a vinyl aromatic hydrocarbon in the presence of an alfin catalyst, in which as a molecular weight regulator is used a halogenated unsaturated hydrocarbon represented by the formula, ##EQU1## wherein R is an alkyl group having 1 to 7 carbon atoms, a vinyl group, a phenyl group, an alkyl-substituted phenyl group, a halogen atom or a hydrogen atom, and X, Y and Z which may be same or different are individually a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, at least one of the R, X, Y and Z being a halogen atom.

Abstract: Sintered micro-powder of tetrafluoroethylene polymer having an average particle size of 100 microns or less, a sphere factor of 1.2 or less, a specific gravity of 2.20 or less, and a weight loss on heating of 0.5 percent or less. The process for the preparation thereof comprising atomizing an aqueous dispersion containing 5 to 80 percent by weight of tetrafluoroethylene polymer particles having 0.05 to 0.5 micron average particle size into a gas at a temperature above the melting point of the tetrafluoroethylene polymer and recovering the sintered micro-powder.

Abstract: A fluoroelastomer composition which contains (a) a fluoroelastomer, (b) at least one metal compound selected from the group consisting of bivalent metal oxide, bivalent metal hydroxide and mixture of bivalent metal oxide or metal hydroxide with metal salt of weak acid, (c) an aromatic polyhydroxy compound, (d) a quaternary ammonium compound of 8-alkyl- or 8-aralkyl-1,8-diaza-bicyclo[5.4.0]-7-undecenium, and (e) 1,8-diaza-bicyclo[5.4.0]-7-undecene in an amount of not more than 0.07 part by weight per 100 parts by weight of fluoroelaster, provides a fluoro-rubber having a low compression set and an excellent elastic property. The fluoroelastomer composition can be handled and processed with safety, and yet can be cured with an appropriate induction time and a good cure rate, and has excellent storage properties.

Abstract: A tetrafluoroethylene polymer or copolymer suitable e.g. for extrusion on to wire to give an insulated conductor is produced using a dual catalyst system. The first catalyst component is a catalyst giving a high molecular weight (low SSG) such as ammonium persulphate (APS). The second component is a dibasic acid peroxide e.g. disuccinic acid peroxide (DSAP) which is added after the polymerisation has reached 20% conversion. The latter catalyst is found to produce a copolymer powder which can be extruded on to wire to give faultfree coating.