Abstract: The present invention relates to a mass polymerized rubber-modified polymeric composition comprising a continuous matrix phase of a polymer of a monovinylidene aromatic monomer, and optionally, an ethylenically unsaturated nitrile monomer, and rubber particles produced from a functionalized diene rubber.

Abstract: A method of preparing a thermoplastic elastomer, and compositions thereof, are disclosed comprising: (I) mixing (A) a thermoplastic resin comprising more than 50 percent by volume of a polyester resin having a softening point of 23° C. to 300° C., (B) a silicone elastomer comprising a diorganopolysiloxane, where the weight ratio of said silicone elastomer to said thermoplastic resin is from 35:65 to 85:15, (C) a glycidyl ester compatibilizer, (D) an organohydrido silicon compound, and (E) a hydrosilation catalyst, components (D) and (E) being present in an amount sufficient to cure said diorganopolysiloxane; and (II) dynamically vulcanizing said diorganopolysiloxane, wherein at least one property of the thermoplastic elastomer selected from tensile strength or elongation is at least 25% greater than the respective property for a corresponding simple blend wherein said diorganopolysiloxane is not cured and said thermoplastic elastomer has an elongation of at least 30%.

Abstract: The invention relates to a process for preparing a composition comprising a vinylaromatic polymer matrix and particles of rubber, which comprises a step of polymerizing at least one vinylaromatic monomer in the presence of a rubber comprising a group which generates a stable free radical. The process makes it possible to obtain morphologies other than salami morphologies, such as the labyrinth, onion or capsule morphology, with the aim, for example, of enhancing the gloss of the high-impact vinylaromatic polymer.

Abstract: A grafting reaction system comprises an activated polymer and a grafting medium containing a monomer, with the system containing free radicals. The system further comprises 0.1 to 2% by weight of the grafting medium and monomer of a homopolymerization inhibitor compound, the inhibitor compound comprising a compatabilizing function toward the grafting medium which is selected from the group consisting of sulfonic, carboxylic and phenolic groups, and an inhibiting function which acts as a transfer agent for the free radicals, the inhibiting function being an allyl-type unsaturated group. The inhibitor compound has a diffusing capacity through the grafting medium which is greater than its diffusing capacity through the polymer.

Abstract: An aqueous structural adhesive bonding primer composition containing a water-dispersible, modified phenoxy resin, an amine-aldehyde resin and a catalyst for reaction between the resins. The primer may contain corrosion inhibitors, including a novel chromate-free inhibitor system.

Abstract: An adhesive bonding primer composition containing a water-dispersible, modified epoxy resin and a water-dispersible corrosion inhibitor mixture of components I. and II. in which:Component I. is at least one, but not more than two of:(a.) a zinc salt of a carboxylic acid of the formula: ##STR1## (b.) zinc phosphate, and (c.) zinc molybdate,wherein Y.sub.4 is hydroxyl or a radical of the formula: ##STR2## Y.sub.3 is --CO-- or --SO.sub.2 --, Y.sub.1 is C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.8 -alkoxy or halogen when Y.sub.4 is other than hydroxyl, carboxyl when Y.sub.4 is hydroxyl, or hydrogen when Y.sub.4 is ##STR3## or Q.sup.1 is nitro, or m is 2, Y.sub.2 is hydrogen, C.sub.1 -C.sub.8 -alkyl, nitro, hydrogen or halogen, Q.sup.1 is hydrogen, nitro or halogen, m and n are each 1 or 2; andComponent II.

Abstract: A hydrogenated block copolymer having a number-average molecular weight of 40,000-700,000, obtained by hydrogenating at least 80% of the olefinic bonds of a block copolymer having in the molecule at least one each ofa polymer block A composed of 90% by weight or more of a vinyl aromatic compound,a polybutadiene polymer block B having a 1,2-vinyl structure of 30-70%, anda polybutadiene polymer block C having a 1,2-vinyl structure of less than 30%,in which block copolymer the blocks A, B and C are contained at a specific ratio, or a unit of the block copolymer is bonded, via a coupling agent residue, to at least one polymer block unit of the blocks A, B and C and thereby the polymer molecular chain is extended or branched; and a thermoplastic resin composition comprising the hydrogenated block copolymer.

Abstract: Disclosed is a method of making graft copolymers of olefin polymers by contacting a particulate olefin polymer with a free radical polymeriztion initiator, e.g., a peroxide, and a vinyl monomer at about from 60.degree. to 125.degree. C., while controlling the monomer addition rate so that it does not exceed about 4.5 pph/min, and most preferably does not exceed about 3.0 pph/min, at any monomer feed level. To prevent polymer degradation, a non-oxidizing environment is maintained throughout the process, and residual free radicals are deactivated, and unreacted initiator is decomposed, before the graft copolymer is exposed to air.

Abstract: Immunoassay methods and compositions are disclosed for the detection of analytes in fluid samples. The disclosure provides conjugates of analytes or reactants with polymerizable organic monomers. Specific binding reactions between reactants are detected by means of resporter/reactant conjugates. Free and specifically-bound reporter/reactant conjugates are separated by a polymerization reaction which renders the polymerized monomers insolule.

Abstract: Methods and compounds are disclosed for determining the presence, amount of, or association between substances of interest in samples suspected of containing same. The methods are based on the polymerization-induced separation of specifically-bound, reporter-labeled recognition reactants from free, reporter-labeled recognition reactants. The methods described are applicable to any substance for which suitable recognition reactants exist or can be made and are not limited by considerations such as chemical composition or molecular size.

Abstract: A process for grafting acrylamide onto the surface of low density polyethylene (LDPE). The LDPE is first oxidized by a chromic acid solution and then reduced with diborane to produce a hydroxyl-rich surface. Acrylamide is then grafted onto the surface of the LDPE by free-radical initiation, resulting in a hydrophilic polyacrylamide layer covalently bonded to the LDPE. The process has no effect on the bulk properties of the LDPE.

Abstract: Immunoassay methods and compositions are disclosed for the detection of one or more analytes in fluid samples. The disclosure provides conjugates of analytes or reactants with polymerizable organic monomers. Specific binding reactions between reactants are detected by means of reporter/reactant conjugates. Free and specifically-bound reporter/reactant conjugates are separated by a polymerization reaction which renders the polymerized monomers insoluble.

Abstract: The invention relates to the use of grafted ethylene-vinylacetate copolymers (EVA-copolymers) for the production of hotmelt adhesives.

Abstract: A process for modifying the surface characteristics of a pre-formed polymeric substrate to impart hydrophilicity, hydrophobicity, or other desired properties thereto, by peroxidizing the surface of the substrate and then allowing the active sites along the polymer chains to generate free radicals which induce graft polymerization of a suitable ethylenic monomer (or other ethylenically-unsaturated compound) onto the surface of the substrate is described. Such graft copolymerization is undertaken in the presence of variable valence metal ions in a reduced state under acidic conditions and at selected reaction times and relatively low temperatures, and ideally in the presence of squarate ions (diketocyclobutenediol) to control the physical characteristics of the surface graft and to restore the metal ions to their lower valence state without at the same time producing deleterious by-products.

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: Method for preparing a polyolefin modified by grafting, in which in a first phase, peroxides are grafted in known manner onto a polyolefin chain with a mixture of oxygen and ozone, wherein, in a second phase, a vinyl monomer with at least one epoxy function is added to the resulting peroxidized polyolefin, and in a third phase, the resulting mixture is polymerized.The invention finds an application in the preparation of polypropylene with excellent adhesive properties especially with iron, leather and glassfibers.

Abstract: Particles of two different normally solid materials are caused to react by generating free radicals on the surfaces of at least one of the solids by mechanical working, suitably by comminution, at cryogenic temperatures. At least one of the solids is preferably a polymeric material while the other may be a different polymer, a catalyst, a lubricity enhancing material, a filler, a pigment or the like.

Abstract: A styrene resin composition which is admixed with a styrene-vinyl acetate block copolymer is improved in the fluidity without degrading the mechanical strength and electric insulation resistance. Said vinyl acetate block polymer can easily be obtained by using a polymeric peroxide having ester bonds in the molecule thereof, notwithstanding that a copolymer of a styrene and a vinyl acetate could not be prepared easily by the prior art.

Abstract: A process for modifying the surface characteristics of a pre-formed polymeric substrate to impart hydrophilicity, hydrophobicity, or other desired properties thereto, by peroxidizing the surface of the substrate and then allowing the active sites along the polymer chains to generate free radicals which induce graft polymerization of a suitable ethylenic monomer (or other ethylenically-unsaturated compound) onto the surface of the substrate is described. Such graft copolymerization is undertaken in the presence of variable valence metal ions in a reduced state under acidic conditions and at selected reaction times and relatively low temperatures, and in the presence of squarate ions (diketocyclobutenediol) to control the physical characteristics of the surface graft and to restore the metal ions to their lower valence state without at the same time producing deleterious by-products.

Abstract: A dry grafting method of grafting a vinyl monomer onto a polymer, which method comprises admixing into an essentially dry, solvent-swollen, finely-divided, particulate, solid, polymer admixture, wherein the polymer has free radicals formed thereon and the admixture is essentially free of a polymerization initiator, a small grafting amount in incremental portions of a vinyl-monomer material to be grafted onto the swollen polymer, the amount of vinyl monomer sufficient to maintain an essentially free-flow, stirrable, particulate admixture, and effecting grafting of the vinyl monomer to the polymer.

Abstract: When polystyrenes having peroxy bonds therein are charged into a polymerization system of methyl methacrylate series monomers, the said polystyrenes act as an opaquing agent and a polymerization initiator.The obtained opaque or translucent plate is splendid in optical and mechanical properties.