Abstract: Vinyl chloride monomer, or a monomeric mixture comprising vinyl chloride as a main component and other monomers co-polymerizable therewith in an aqueous reaction medium, is polymerized in a polymerization vessel. All of the surfaces of the inside walls of the vessel and the agitator blades, the baffle plates and the like with which the vessel is equipped, are coated prior to the polymerization with at least one of a specific class of nitrogen-containing aromatic heterocyclic compounds. Not only is the deposition of polymer scale surprisingly reduced, but also the polymer thus obtained has good physical and chemical properties.

Abstract: A structural hot melt adhesive of butadiene grafted ethylene-vinyl acetate. The butadiene graft is 1 to 12 percent by weight, preferably 4 to 8 percent by weight. The ethylene/vinyl acetate ratio is about 91/9 to 72/28, preferably about 83/17. Preferably grafting is done at room temperature using radiation. Peel adhesion on various fabric and metal substrates improved over ungrafted control samples from 100 to as much as 1500 percent.

Abstract: A thermally-staged process for preparing polymers, particularly alternating interpolymers of one or more polar monomers and one or more mono or polyolefins which comprises: (1) reacting, in a first stage, a polar monomer-Lewis Acid complex with an olefin in the presence of an active oxygen compound at a temperature of about -100.degree.C to about 0.degree.C for a time sufficient enough to allow for conversion of up to 50% of the polar monomer to interpolymer; (2) raising the temperature of the reaction mixture, in a second stage, to about 0.degree. to about 100.degree.C; (3) maintaining the reaction mixture at about 0.degree. to about 100.degree.C for a time sufficient to optimize the yield of interpolymer; and (4) recovering the interpolymer from the reaction mixture.Polymers prepared by the temperature-staged process of this invention possess substantially higher molecular weights than the same polymers made by prior art processes.

Abstract: Polymers of ethylene characterized by wide molecular weight distribution are produced by reacting the product at temperatures of at least 100.degree.C a mixture obtained by adding a alkene copolymer, containing reactive halogen to the polymerization product of ethylene optionally with a minor amount of another alpha-alkene in the presence of an active Ziegler-type polymerization catalyst.

Abstract: A modifier for vinylidene chloride resin which is produced by polymerizing 50 to 20 parts by weight of a vinyl monomer mixture comprising 0 to 60 weight percent methyl methacrylate, 0 to 30 weight percent acrylic acid ester and more than 20 weight percent aromatic vinyl monomer, in the presence of 50 to 80 parts by weight of a rubber latex consisting essentially of ethylene-vinyl acetate copolymer containing 50 to 80 weight percent vinyl acetate.

Abstract: In a process for producing olefin polymers, a hydrocarbylaluminum hydrocarbyloxide such as diethylaluminum ethoxide is introduced into the reaction zone in a stream separate from the catalyst to reduce fouling.

Abstract: The invention provides novel thermoplastic films produced by the blown tube process having improved and balanced characteristics. The improved film is characterized by crystallites dispersed throughout the film in amorphous areas and which is substantially free of crystalline formation, as well as having improved other properties. The film is produced by acting on a molten tube following extrusion to cool the tube to a temperature above the crystalline formation temperature, followed by an annealing step and a second cooling step to initiate solidification of said tube.

Abstract: A method for preventing fouling in the slurry polymerization of olefins in a solvent in the presence of a catalyst, which comprises causing a small amount of a nitrogen-containing salt of phytic acid or a mixture of it with an alkali metal salt of an organic acid to be present as an anti-fouling agent in the polymerization system.

Abstract: A process and apparatus for the continuous polymerization of ethene at high pressures and temperatures, in the presence of an initiator. Reaction is carried out in a cylindrical autoclave wherein ethene is fed into the autoclave at a high velocity through nozzles having a restricted opening. The nozzles are fitted and mounted on the autoclave in at least two different places at an angle which is acute to the central axis of the autoclave whereby the direction of flow of the ethene coming from the nozzles is substantially parallel and opposite.

Abstract: This invention relates to single component, hot-melt, pressure-sensitive adhesives based on propylene/higher 1-olefin copolymers containing 40-60 mole % of the higher 1-olefin. Suitable comonomers include 1-hexene through 1-decene. These new adhesives can be readily applied to substrates such as tape by means of conventional hot-melt coating equipment and thereby eliminate the solvent pollution problems associated with the application of current solvent-based pressure-sensitive adhesives. Our hot-melt coated tapes generally have pressure-sensitive adhesive properties at least equivalent to those of solvent coated pressure-sensitive tapes.

Abstract: A polymeric composition comprises a polymerised propylene sequence and a propylene/ethylene copolymer sequence, has a melt index (230.degree.C; 2.16 kgms) of 0.01 to 0.5, preferably 0.025 to 0.25 and an ethylene content in the range 10-30% by weight, preferably at least 15% by weight. The polymer can accept a high carbon loading, for example in excess of 25% by weight. The invention also includes an electric conductor insulated with the polymer and also the use of the carbon filled polymer as a dielectric screen material.

Abstract: A method for producing solid polymers having a molecular weight greater than 50,000 from olefins wherein the olefin is polymerized in the absence of a liquid dispersion agent of a nature different from that of the olefin to be polymerized, and in contact with a prepolymer containing a small amount of transition metal of subgroups IV-b, V-b and VI-b having been produced by the polymerization of an olefin in a dispersion liquid containing a Ziegler-type catalyst.

Abstract: A continuous process for the polymerisation of olefinically unsaturated monomers in bulk or in solution in which at least a portion of the low-viscosity materials to be fed to the polymerization zone is thoroughly mixed with a portion of the high-viscosity contents of the polymerization zone in a mixing zone disposed upstream of the polymerization zone, which mixture is then continuously fed to the polymerization zone. The resulting polymers have a uniform composition and a narrow molecular weight distribution. They may be converted to shaped articles by thermoplastic methods.

Abstract: Vinyl halide is homopolymerized under suspension conditions with additional vinyl halide being added after the pressure drop with polymer being recovered only after the polymerisation is completed.

Abstract: A process for preparing a polyolefin graft copolymer, which comprises subjecting a copolymer selected from the group consisting of copolymers of ethylene with diolefins and copolymers of C.sub.3 to C.sub.8 .alpha.-olefins with diolefins and containing 2 to 40 double bonds per 1000 monomeric units therein and a monomer radical graft-copolymerizable onto said copolymer to a suspension graft copolymerization in the presence of a radical initiator in an inert organic solvent capable of dissolving said radical-polymerizable monomer but incapable of dissolving said graft copolymer and of reacting therewith, at a temperature at which said copolymer is not melted.

Abstract: Modified polymers, particularly polyolefins having improved flow and in some instances improved adhesion properties over that of a polymeric, e.g. polyolefin, base stock used as a starting material, are produced by a controlled reaction often involving degradation in an extruder, in which an initiator is injected under conditions of either maximum distribution or intensive mixing wherein appreciable rheological, i.e. molecular weight distribution, changes in said base polymer occur. In some embodiments monomers are also grafted to said base stock, during said degradation process. In such instances, exceptional, novel, grafted polymers with high melt flow properties and other useful properties are obtained.

Abstract: Ethylene is grafted onto polymers of conjugated dienes to form copolymers having both thermoplastic and elastomeric properties. This grafting is effected by a catalyst system comprising (1) a titanium or vanadium halide, (2) an aluminum trihydrocarbon and (3) a carbonyl compound such as acetophenone. The resultant graft copolymer has elastomeric properties due to the diene polymer backbone and thermoplastic properties from the grafted polymeric ethylene blocks.

Abstract: Substrates are bonded by applying to a substrate a graft copolymer of 0.1 - 20 parts by weight of an unsaturated carboxylic acid or anhydride, 1 - 40 parts by weight of a vinyl monomer containing at least one chlorine atom in the presence of 99 - 40 parts by weight of an ethylene-vinylacetate copolymer.

Abstract: Olefin polymers are made using a chromium oxide catalyst on a support formed by adding an acidic material to a silicate solution containing titanium. This catalyst is capable of producing a polymer of an olefin having a high melt index and is of particular utility in the production of such polymer in a particle-form process.

Abstract: A process for preparing petroleum resins having a low melt viscosity and satisfactory compatibility, characterized by firstly polymerizing a first feed portion comprising at least one chain conjugated diolefin having 4 to 5 carbon atoms and at least one monoolefinic unsaturated hydrocarbon having 4 to 10 carbon atoms in a proportion of 20 - 80 percent by weight of the monomers contained in the first feed portion and secondly polymerizing a second feed portion comprising at least one such chain conjugated diolefin and, if desired, at least one such monoolefinic unsaturated hydrocarbon, the first and second polymerizations being successively conducted in the presence of a Friedel-Crafts type catalyst in a polymerization reactor or reactors connected in series to each other.