Abstract: An improved VI improver and a fluid composition comprising the VI improver. The VI improver is an asymmetric radial polymer comprising a plurality of arms having at least two distinctly different peak molecular weights, which arms are chemically the same. The weight ratio of a longest set of arms and a first set of shorter arms will vary within the range from about 1.2:1 to about 8.0:1. If more than one set of shorter arms is used the ratio of adjacent arms molecular weights will vary within the same range. While the arm might be essentially any polymer, polymers of conjugated diolefins and copolymers of at least one monoalkenyl aromatic hydrocarbon and at least one conjugated diolefin are preferred. Conjugated diolefin homopolymers are preferred and polyisoprene is most preferred.

Abstract: A method for preparing a polyolefine--vinyl polymer composite, wherein about 10-200 parts by weight of vinyl monomer and about 0.01-4.0 parts by weight of a free radical polymerization initiator, based on 100 parts by weight of vinyl monomer, are impregnated in 100 parts of weight of polyolefine particles by slowly mixing these at a temperature of about 20.degree.-130.degree. C. while maintaining the particle structure of the polyolefine. After 50-99% of the amount of the monomer has been absorbed into the polyolefine particles, a water suspension is prepared by adding to the above-mentioned mixture about 80-1000 parts by weight water, based on 100 parts of weight of polyolefine+vinyl monomer, as well as a stabilizing agent. The temperature of the water suspension is then increased for polymerizing the vinyl monomer.

Abstract: A vulcanizable rubber composition comprising an ethylene-.alpha.-olefin copolymer modified with an alkenyl aromatic compound alone or in combination with at least one other polymerizable compound, as a polymer component. The vulcanizable rubber composition is excellent in weather-resistance, ozone-resistance and heat-resistance and has a high strength, a high rigidity and a high hardness.

Abstract: A process for preparing an impact resistant resin, which comprises a step of graft copolymerizing a monomer mixture comprising an aromatic vinyl monomer and a monomer copolymerizable therewith, to a butadiene rubber-like polymeric latex in the presence of a redox polymerization initiator; a step of coagulating the resulting graft copolymer latex by mixing an antioxidant thereto and adding an alkaline earth metal salt thereto; and a step of washing the coagulated product by a washing water having the pH adjusted to a level of at most 7.

Abstract: A water soluble graft copolymer useful for dewatering wastewater having the structure: ##STR1## wherein E is the repeat unit obtained after polymerization of an .alpha., .beta. ethylenically unsaturated compound, the molar percentage of a:b is from about 95:5 to 5:95, with the proviso that the sum of a and b equals 100% G comprises the structure: ##STR2## wherein d is a cationic monomer, R.sub.1, R.sub.2 and R.sub.3 are the same or different and are hydrogen or a lower alkyl group having C.sub.1 to C.sub.3, F is the salt of an ammonium cation and the molar percentage of c:d is from 95:5 to 5:95 with the proviso that the sum of c and d equals 100%.

Abstract: A graft polymer is prepared by grafting, onto a polymeric substantially saturated hydrocarbon backbone, a free-radical polymerizable vinyl nitrogen monomer, which grafting takes place with improved efficiency in the presence of minor amounts of a volatile aliphatic hydrocarbon substituted aromatic solvent capable of free-radical hydrogen atom chain transfer. The modified hydrocarbon based polymer finds utility as an additive for lubricating oils, particularly as dispersant-viscosity improvers for engine oils.

Abstract: The present invention is directed to a novel polymodal asymmetric elastomeric block copolymer and a pressure sensitive adhesive and tape made therefrom. The novel block copolymer comprises from about 4 to about 40 percent by weight of a polymerized monovinyl aromatic compound and from about 96 to about 60 percent by weight of a conjugated diene. The block copolymer has the general formula Q.sub.n Y where Q represents an individual arm of the block copolymer and has the formula S-B; n represents the number of arms and is at least 3; and Y is the residue of a multifunctional coupling agent. Furthermore, S is a nonelastomeric polymer segment endblock of a polymerized monovinyl aromatic homopolymer, there being at least two different molecular weight endblocks in the block copolymer. The number average molecular weight of the higher molecular weight endblock (Mn).sub.H is in the range of from about 5,000 to about 50,000, and the number average molecular weight of the lower molecular weight endblock (Mn).sub.

Abstract: A weather resistant impact modifier for thermoplastic resins and a blend with the thermoplastic resin are disclosed. The modifier comprises a graft copolymer having a multi-layered structure which is obtained by graft polymerization of (c) 10-100 parts by weight of an aromatic vinyl compound or a monomer mixture mainly composed of an aromatic vinyl compound in a first stage and 10-100 parts by weight of a methacrylic ester or a monomer mixture mainly composed of a methacrylic ester in a second stage,(b) to 100 parts by weight of an elastomer obtained by polymerizing 98-60 parts by weight of a monomer mixture composed of 50-99.95% by weight of an acrylic ester, 0-50 wt % of a copolymerizable monomer and 0.05-5% by weight of a polyfunctional monomer,(a) in the presence of 2-40 parts by weight of a butadiene elastomer having a degree of swelling of 5-40 and an average particle size of not smaller than 0.15 .mu.m (wherein the total of (a) and (b) is 100 parts by weight).

Abstract: Rubber compositions are disclosed which are tailored to exhibit high adhesion to brass, sufficient resistance to heat and to oil and great elasticity. A selected class of highly hydrogenated acrylonitrile copolymer rubbers are blended with specified amounts of a selected class of trially isocyanurate compounds, organic sulfur-containing compounds or sulfur donors and organic peroxides. Also disclosed is a hose built with an inner tube formed from the above rubber composition and a reinforcing layer from a pressure-resistant, metallic wire plated with brass.

Abstract: A grafted and/or functionalized macromolecule comprises entanglement-inhibited architecture wherein the polymer exhibits reduced melt viscosity. In one embodiment, the macromolecule comprises a polymer of an isoolefin having about 4 to about 7 carbon atom and a para-alkylstyrene, wherein a grafted macromonomer such as a terminally functionalized polystyryl chain of very narrow molecular weight distribution is attached to the para-alkyl group of the para-alkylstyrene such that entanglement of adjacent chains in the melt are inhibited. In addition to distributed macromonomer grafts, other functionality may be attached to the para-alkyl group of the para-alkylstyrene to introduce other desirable properties such as radiation curability. In another embodiment the macromolecule comprises a polymer of one or more simple olefinic monomers wherein a macromolecule is attached to pendent functionality and/or copolymerized into the polymer backbone.

Abstract: A methacrylic resin composition with improved tacky adhesion comprising 100 parts by weight of a partially cross-linked polymer gel obtained by partially polymerizing a mixture comprising (A) 40 to 99% by weight of unsaturated monomer mixtures with or without containing the polymers thereof dissolved and (B) 60 to 1% by weight of a cross-linking agent, thereby allowing the total polymer content to be kept not exceeding 80% by weight, and increased by 4 to 62% by weight over the polymer content of said mixture, and 1 to 100 parts by weight of a syrup mainly composed of alkyl methacrylates containing the polymers thereof dissolved.

Abstract: The present invention provides a thermoplastic elastomer composition having high thermal resistance. It comprises a thermoplastic graft copolymer of which main chain is constituted by a polymer having a glass transition temperature of 10.degree. C. or blow and side chain is constituted by an aromatic oligomer having a flow temperature of 100.degree. C. or above, and an olefinic polymer.

Abstract: There are disclosed novel, solid, elastomeric block copolymers with improved resistance to cold flow wherein either 1) the terminal blocks are polymers of at least one conjugated diene I, e.g., isoprene, which contains at least five carbon atoms with at least one of each pair of double-bonded carbon atoms in the polymerized diene I units being additionally single-bonded to two carbon atoms, at least one middle or interior block is a polymer of butadiene, and at least one middle or interior block is a polymer of at least one aryl-substituted olefin, e.g., styrene; or 2) the terminal blocks are random copolymers of at least one diene I as previously defined and butadiene, and at least one middle or interior block is a polymer of at least one aryl-substituted olefin.

Abstract: A process for preparing a resin having a low iodine value, comprising treating a resin having a residual unsaturated bond with a cationic polymerization catalyst. According to the process, a resin in which residual unsaturated bonds are decreased can be prepared, and the obtained resin having a low iodine value can be suitably used as raw materials for flame retarders, adhesives and the like.

Abstract: Flame-retardant, thermoplastic copolymers and processes for making them are disclosed. The compositions are copolymers of a vinyl aromatic monomer, a vinyl phosphonic acid derivative, and optionally, an unsaturated organic diacid, ester, or anhydride that are grafted onto a rubber. Processes for making polymers having high molecular weight, good mechanical properties, and a high level of evenly distributed, chemically incorporated vinyl phosphonate flame retardant are also disclosed.

Abstract: According to the present invention, a production method of a carrier appropriate for cation exchange liquid chromatography and a method for determining glycosylated hemoglobins using the carrier obtained by the production method are provided.The production method of the carrier comprises the steps of providing hydrophobic particles to which a polymerization initiator is adhered; and adding a polymerizable monomer having a carboxyl group to an aqueous dispersion in which the hydrophobic crosslinked polymer particles are dispersed and polymerizing the monomer on surfaces of the hydrophobic crosslinked polymer particles, thereby obtaining polymer particles the surfaces of which are coated with polymer layers having carboxyl groups.

Abstract: A grafted copolymer containing low cis-polybutadiene having a Mooney viscosity of 30 to 40 as a rubber component, and 30% by volume or more of particles of said rubber component becoming non-spherical rubber particles when molded into a molded article, is suitable for use as a low gloss agent which is usable in the fields of internal and external automotive trims, exterior parts of household electric appliances, etc.

Abstract: This invention relates to a core-shell polymer which is useful for polyoxymethylene resin, a polyoxymethylene resin composition containing the core-shell polymer and a molded article made of the polyoxymethylene resin composition.The core-shell polymer comprises a rubbery polymer core and a glassy polymer shell and has substanially no detectable anion.This core-shell polymer makes the molded articles be improved on the impact strength, elongation at the weld line, etc. The molded articles is used as various products (such as gears, reels, etc.).

Abstract: An oil soluble nitrogen containing grafted degraded ethylene copolymers useful as multifunctional viscosity index improvers or modifiers, such as VI improver-dispersant additives. The nitrogen containing grafted degraded ethylene copolymers are grafted with an ethylenically unsaturated carboxylic acid grafting material and the grafted degraded ethylene copolymers are then reacted with at least one polyamine containing one primary amine group and at least one or more secondary amine groups.

Abstract: A process is provided for the production of an emulsifiable polypropylene wax having a melt viscosity from 1000 to 5000 cP at 190.degree. C. This process entails reacting at a temperature below 190.degree. C. a thermally degraded polypropylene wax having a melt viscosity below 1000 cP (at 190.degree. C.) with maleic anhydride in the presence of a free radical source. Floor polish formulations containing this polypropylene wax are very clear but yet provide floor finishes that are very tough.