Abstract: A hot-melt adhesive composition comprising a styrene-type hydrocarbon-modified polyolefin (c) composed of 100 parts by weight of a crystalline polyolefin (a) having a degree of crystallinity of at least 10% and 0.15 to 50 parts by weight of a styrene-type hydrocarbon (b) bound thereto by great-copolymerization, said modified polyolefin (c) having an intrinsic viscosity [.eta.] of 0.5 to 5 dl/g, a degree of crystallinity of at least 10% and a weight average molecular weight Mw/number average molecular weight Mn ratio of from 1 to 15; and use of the aforesaid composition as an intermediate adhesive layer in laminating two polymers.

Abstract: A process for producing a resin composition which comprises suspension-polymerizing at least one vinyl monomer in an aqueous medium in the presence of a dispersing agent, said suspension polymerization being carried out using a nonionic dispersant as said dispersing agent in the presence of a high-molecular-weight vinyl polymer having a weight average molecular weight of at least 500,000 obtained by emulsion polymerization.

Abstract: A process for producing a polypropylene-polystyrene interpolymer which can be impregnated with a blowing agent and can then be expanded under normal conditions for polystyrene particles to low density, fine cell structure foams. The interpolymer is viscbroken during the polymerization of the styrene. The polypropylene is lubricated prior to formation of the interpolymer. The process forms particles which can be impregnated with blowing agent directly.

Abstract: Ethylenically unsaturated monomers are grafted on homo- and olefinic co-polymers by means of a radicalic reaction, operating at between 60.degree. C. and 160.degree. C., in a solution of the polymer in a solving medium consisting of, or predominantly comprising a mixture of a component (A), chosen between aliphatic hydrocarbons, aromatic hydrocarbons, esters and ethers containing at least one aromatic or cycloaliphatic group, with a component (B) consisting of an aliphatic, cycloaliphatic or aromatic ketone, and by separating at the end of the reaction the grafted polymer, by means of the cooling down of the solution to a temperature below 40.degree. C.

Abstract: A curable resin composition which comprises (1) a copolymer composed of an aminoalkyl acrylate and/or aminoalkyl methacrylate and an ethylenically unsaturated monomer being formulated with (2) a compound having at least two acryloyl groups in the molecule.The composition can be cured at low temperatures in the range of ordinary temperature to 120.degree. C., and therefore advantageously used for the formation of coating films in the application fields, such as plastics, wood and concrete, where heat treatment cannot be performed. Also, the composition which exhibits excellent adherence toward various kinds of substrates can be used as adhesives and different kinds of primers, as well. Furthermore, the composition can provide coating films that excel in terms of water resistance, weathering resistance and solvent resistance, and therefore be utilized for overpaints, etc.

Abstract: Olefinic polymers characterized by the presence of free carboxylic groups arranged along the polymeric chain, obtained by radicalic grafting of unsaturated carboxylic acids onto the chain of the olefinic polymer. The products so obtained exhibit in particular a high adhesion to metals. The manufacturing process is based on the use of at least two different organic peroxides, having different reactivities.

Abstract: A process for producing a chemically blended propylene polymer composition having an ethylene content ranging from 3 to 40% by weight and being greater than the weight of the rubbery propylene copolymer formed in stage (II) below, which comprises the following stages (I) and (II):(I) a first stage of polymerizing propylene containing 0 to 5 mole % of another olefin in the presence of a catalyst composed of (A) a solid titanium catalyst component consisting essentially of titanium, magnesium, halogen, and an electron donor, (B) an organoaluminum compound, and (C) an organic silicon compound having an Si--O--C bond or an Si--N--C bond to thereby form a crystalline propylene polymer or copolymer; and(II) a second stage of polymerizing propylene and ethylene, or propylene, ethylene and another olefin in the presence of the reaction product of the first stage and the same catalyst as used in the first stage to form a rubbery propylene copolymer and a crystalline ethylene polymer or copolymer.

Abstract: Improved impact modifier composition comprising elastomeric impact modifier polymer and dunkelsperser in a weight ratio of about 99.5/0.5 to 96/4 which is subject to substantially reduced gel formation in rigid thermoplastic matrix polymer formulations. Also disclosed are such formulations, as well as processes for preparing the improved impact modifier compositions.

Abstract: Polypropylene compositions having high impact strength at low temperatures comprising as essential components:100 parts by weight of polypropylene having an isotacticity index >90,8-25 parts by weight of an amorphous copolymeric fraction (1) of ethylene-propylene soluble in xylene at 23.degree. C., containing 20-80% by weight of ethylene,2-10 parts by weight of an ethylene-propylene crystalline copolymeric fraction (2) having a crystallinity of the polyethylene type containing 50-90% by weight of ethylene;and in which the weight ratio between the total polymerized ethylene and fraction (1) is <1.The compositions are prepared by polymerization processes comprising at least a step of homopolymerization of propylene to stereoregular polymer and a subsequent step of polymerization of ethylene-propylene mixtures in the presence of catalysts comprising a titanium compound carried on a magnesium halide in active form.

Abstract: A graft-modified copolymer having a melt flow rate of 0.01 to 100 g/10 min at a temperature of 230.degree. C. under a load of 2160 g. The graft-modified copolymer is prepared by grafting (a) 100 parts by weight of low crystalline or amorphous ethylene-alpha-olefin copolymer having an ethylene content of 40 to 93 mole%, a melt flow rate of 0.1 to 50 g/10 min at a temperature of 230.degree. C. under a load of 2160 g, and a density of 0.90 g/cm.sup.3 or less with (b) 0.3 to 50 parts by weight of a styrene-type hydrocarbon. This graft-modified copolymer is suitable for use as a compounding agent for improving the impact resistance of styrene-type polymers without decreasing the surface hardness, weathering resistance, and molding properties thereof.

Abstract: Herein disclosed are a toner composition for the development of electrostatic latent images which comprises a polymer obtained by polymerizing a polymerizable monomer or monomers in the presence of a chlorinated polyolefin, and a method for preparing the same.

Abstract: A stretched film having excellent printing and writing properties and mechanical strength is produced by stretching a film molded from a styrene-grafted polyolefin resin in at least one direction. The styrene-grafted polyolefin resin is produced by heating an aqueous suspension containing 100 parts by weight of polyolefin resin particles, from 10 to 400 parts by weight of a styrene monomer, and a free radical polymerization initiator in an amount of from 0.01 to 1 part by weight per 100 parts by weight of the styrene monomer.

Abstract: A polypropylene molding composition of polypropylene, ethylene-propylene copolymer and polyethylene having a high hardness and increased impact strength and homogeneity after processing is obtained by way of a continuous three-stage polymerization, when the melt viscosities of the polymer mixtures obtained in the individual stages are in a determined ratio of one to the other.

Abstract: An olefin copolymer rubber graft composition having a viscoelastic performance index of not greater than 100 as defined by the expressionPI=(DS.times.MV)/i.v.where DS is the die swell of the composition, MV is the melt viscosity of the composition and i.v. is the intrinsic viscosity of a resinous portion extracted from the composition.

Abstract: A process for the impact modification of a plastic with a rubber polymer to form a thermoplastic resin in a reactor extruder is provided. The process includes the steps of dissolving a rubber polymer in a solvent selected from the group consisting of ethylenically unsaturated monomers and non-polymerizable organic compounds to form a feed solution, introducing the feed solution into the feed section of a twin screw reactor extruder, introducing a separate feed stream containing a material in sufficient amount to precipitate the rubber polymer, heating the feed solution and feed stream under pressure to a temperature sufficient for polymerization to begin, polymerizing the monomers with the rubber polymer in the reactor extruder to form a thermoplastic resin and extruding the thermoplastic resin through a die. A novel ABS thermoplastic resin is also provided having a uniform distribution of rubber particles dispersed within the plastic phase of the resin, the rubber particles ranging in size of from about 0.

Abstract: The present invention provides a non-foamed flame-retardant article of polymeric composition comprising at least 20% by weight of a monomer mixture comprising 0-0.1% by weight o-methylstyrene 0-15% by weight m-methylstyrene and at least 85% by weight p-methylstyrene; 0-80% by weight of a different ethylenic unsaturated monomer; and a sufficient amount of flame-retardants wherein the amount of flame-retardants is substantially less than would be needed had the p-methylstyrene been replaced with styrene analogs. The flame retardancy is achieved by the addition of organophosphorus or halogenated organophosphorus flame retardants. High impact resistance is achieved by the incorporation of a rubbery polymer into the polymeric composition.

Abstract: A process for grafting functional organic groups onto EPM and EPDM polymers wherein the grafting reaction is carried out in the cement in which the polymer is originally formed by solution polymerization.

Abstract: A process for producing expandable thermoplastic resin beads which comprises suspending in an aqueous medium 20 to 70% by weight of a random copolymer of propylene and ethylene containing 1 to 10% by weight of ethylene and 99 to 90% by weight of propylene and 30 to 80% by weight of a vinyl aromatic monomer such as styrene, polymerizing the vinyl aromatic monomer in the presence of a polymerization catalyst to graft the vinyl aromatic monomer onto the backbone of the random copolymer and, optionally, adding a cross-linking agent, to form graft-copolymerized thermoplastic resin beads, and introducing a blowing agent into the thermoplastic resin beads. The resulting resin beads have excellent foamability and molding fusability, and a foamed shaped article having superior thermal stability can be prepared from these beads.

Abstract: A process for producing expandable thermoplastic resin beads which comprises suspending in an aqueous medium 20 to 70% by weight of polypropylene resin particles and 30 to 80% by weight of a vinyl aromatic monomer such as styrene, polymerizing the vinyl aromatic monomer in the presence of a polymerization catalyst to graft the vinyl aromatic monomer onto the backbone of polypropylene and, optionally, adding a cross-linking agent, to form graft-copolymerized thermoplastic resin beads, and introducing a blowing agent into the thermoplastic resin beads. The resulting resin beads have excellent foamability and molding fusability, and a foamed shaped article having superior thermal stability can be prepared from these beads.

Abstract: A process for producing an ethylene copolymer having a density of from 0.900 to 0.945 g/cm.sup.3 by copolymerizing in two steps a predominant amount of ethylene with a minor amount of an alpha-olefin containing at least 3 carbon atoms at room temperature to not more than about 100.degree. C. under a pressure of about 1 to about 100 kg/cm.sup.2 in the presence of a catalyst composed of (A) a titanium catalyst component supported on a magnesium compound and (B) an organoaluminum compound; characterized in that said copolymerization is carried out in(i) a first step where about 0.01 to about 50 g, per gram of the titanium catalyst component (A), of the alpha-olefin containing at least 3 carbon atoms is polymerized, said catalyst further comprising an organic acid ester (C), and then(ii) a second step where the final product of ethylene copolymer is formed in an amount more than about 100 times the weight of the polymer formed in the first step.

Abstract: This invention is an improved insulation for electric cables and an improved method of making the insulation. Cross linked polyethylene insulation is too stiff, particularly in high voltage cables which require a thick layer of insulation. Copolymers of polypropylene have electrical properties substantially equal to those of polyethylene, but do not have the necessary physical strength and have to be filled with clay or other filler that provides the required strength but degrades the electrical characteristics. A novel feature of this method is the utilization of the screw of the extruder to effect a mixing of the ingredients in an improved polymer system for cable insulation.

Abstract: The toughness of thermoplastic polyesters can essentially be improved by addition of a new type of graft polymers which contain one grafting site for about 400 to 2000 carbon atoms, the average molecular weight M.sub.w of the graft branches being from 2000 to 40,000.

Abstract: Graft polyblends prepared by polymerizing acrylate ester monomers or mixtures of acrylate ester monomers and vinyl aromatic monomers in the presence of a rubbery saturated hydrocarbon polymer substrate are useful as modifiers for PVC, imparting improved flow and impact properties to PVC formulations when employed at low levels. The rubbery saturated hydrocarbon substrates useful for these purposes include mono-olefin polymers such as polyisobutylene, rubbery copolymers such as EPR, and rubbery hydrogenated polymers and copolymers of conjugated dienes.

Abstract: A process is disclosed for fabricating a thermoplastic, which thermoplastic is either a thermoplastic ionomer or a multiphase graft or block copolymer of the ABA (AB).sub.n, or ##STR1## wherein n is greater than 1 and wherein the polymer blocks, A and B, are each thermoplastic resins having softening points substantially above room temperature with the B block being present in at least about 30 wt. % of the total polymer. The thermoplastic composition is first suspended in finely divided form in a liquid medium in a sufficient amount such that the solids content of the resulting suspension is in the range of from about 15 to about 75 wt. %. The liquid medium must be nonvolatile and must be capable of plasticizing the B block (or the backbone if the ionomer is employed) of the thermoplastic composition above the softening point of that block but must not be capable of plasticizing the A block to a substantial extent. The suspension is then applied as a coating to any desired surface, e.g.

Abstract: An improved vinyl halide or vinyl halide copolymer containing up to 50 percent of a comonomer can be obtained by polymerizing in contact with an aliphatic hydrocarbon olefin homopolymer, copolymer or terpolymer in a process of bulk polymerization comprising single stage or two-stage bulk polymerization wherein high speed agitation is used during the first stage and low speed agitation is used in the second stage. By polymerizing in the presence of the olefin polymer or copolymer, reduced particle size, reduced lump formation, and lower melt viscosity and improved impact strength can be obtained in the resin product. Small amounts of the olefin polymer or copolymer are effective in providing particle size control, reducing lump formation and eliminating scale build-up. Larger amounts of olefin polymer increase impact strength, reduce melt viscosity and provide excellent mold release properties in the final product.