Abstract: A rubber composition for a tire tread, comprising natural rubber and/or polyisoprene rubber, a specific styrene-butadiene copolymer rubber, and halogenated butyl rubber.

Abstract: Disclosed is a multicomponent resin composition which is essentially a blend of three polymers, each of which may be a copolymer, and undergoes a change in light transmittance and color with temperature. The first and second polymers are chosen in combination such that a blend thereof exhibits a phase diagram in which a lower critical solution temperature appears, and the third polymer is one which has mutual solubility, at least partially, with either or both of the first and second polymers. For example, polymethyl methacrylate and a copolymer of vinylidene fluoride and hexafluoroacetone, as the first and second polymers, and polyvinyl acetate are blended together. The phase separation temperature or coloring temperature of the multicomponent resin composition depends on the amount of the third polymer, and opacifying and coloring of the resin composition caused by heating become irreversible by cooling when the amount of the third polymer is sufficient.

Abstract: A low smoke and flame retardant composition comprising an acrylate rubber and a polyolefin resin compatibilized with aluminum trihydrate. The composition can be made by dynamically partially curing blends of acrylate rubber and polyolefin resin with compatibilizing amounts of aluminum trihydrate to yield a thermoplastic elastomer with improved properties at elevated temperatures. The acrylate rubber can comprise an acrylate ester polymer or a copolymer of acrylate ester with ethylene. The polyolefin resin is preferably a high molecular weight polymerization product of either ethylene or propylene, preferably propylene.

Abstract: The char residue formation of molded compositions, upon combustion, is improved by incorporating into the moldable composition a char-forming polymer containing recurring units of at least one monomer capable of undergoing tautomerization, at least one monomer capable of undergoing a nucleophilic substitution reaction by said monomer capable of undergoing tautomerization and, optionally, at least one additional copolymerizable monomer.

Abstract: The invention provides finely dispersed, agglomeration-free chloropolyethylene having good rubber and anti-blocking properties. The invention provides furthermore a process for the manufacture of such a chloropolyethylene, according to which chlorination of the starting polyethylene is carried out in the presence of a dispersing agent system of poly-N-vinylprrolidone and hydrophobic silicic acid. This process allows also the use of polyethylene types having a pronounced tendency to agglomeration.

Abstract: Novel thermoplastic polyelectrolyte complexes are disclosed which are the reaction products of (a) a polyanion and (b) a polycation wherein one of the polyanion and polycation contains repeating units derived from a soft monomer. By the selection of said soft monomers and of the cation group present in the polycation, moldable, extrudable polyelectrolyte complexes are obtained.

Abstract: Innately-transparent, polymethylmethacrylate polyblends, and transparent shaped articles therefrom fabricated, are comprised with components therein of:(a) polymethylmethacrylate; and(b) at least one copolymer of styrene (and/or equivalent vinyl aromatic monomers) with one or more of certain vinyl acids; plus and optionally or as an alternative;(c) at least one mass-made acrylonitrile-butadiene-styrene or acrylonitrile-butadiene-styrene-type resin in addition to or in replacement of and substitution for said component (b).

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: The method of producing a rubber compound having high green strength comprising providing separate rubber components one of which contains a tertiary amine component bound therein and the other of which contains a halogen cross linking agent bound therein, and blending the two rubber components to form a rubber blend having high green strength.

Abstract: A resin composition comprising (A) a polymer having, in the molecule, at least two groups represented by the following structural formula (I): ##STR1## wherein R.sub.1 is isopropyl, sec-butyl, tert-butyl, a C.sub.5-20 alkyl group, a C.sub.3-20 cycloalkyl group, a C.sub.5-20 alkenyl group, a C.sub.3-20 hydroxyalkyl group, a C.sub.5-20 alkoxyalkyl group, a C.sub.3-20 aminoalkyl group, a C.sub.6-20 aryl group or a C.sub.6-20 arylalkyl group, and n is 0, 1 or 2, and (B) a polymer having an electron attractive group and an .alpha.,.beta.-ethylenic double bond adjacent thereto. Though said composition is stable at room temperature, it is crosslinked and cured at high temperatures because the amino group of the polymer (A) adds to the double bond of the polymer (B). Accordingly, said resin composition is suitable for use as a cathodic electrocoating material.

Abstract: An adhesive composition having improved properties for pressure sensitive adhesive applications has been developed comprising a latex of a polymer formed by polymerizing 40-10 percent vinyl or vinylidene monoaromatic monomer, 45-70 percent C.sub.4-6 cojugated diene, 1-5 percent unsaturated acid, and 5-30 percent C.sub.1-8 alkyl ester of acrylic or methacrylic acid. The adhesive preferably also contains a tackifier resin. The adhesive is useful on a number of applications including the manufacture of labels and tapes.

Abstract: Gasoline-soluble copolymers containing, as copolymerized units,(A) from 10 to 40% by weight of styrene,(B) from 10 to 50% by weight of tert.-butyl acrylate and/or vinyl pivalate,(C) from 20 to 40% by weight of isobutyl methacrylate,(D) from 5 to 20% by weight of acrylic acid esters and/or methacrylic acid esters of alkanols of 10 to 20 carbon atoms and(E) from 0 to 5% by weight of monoolefinically unsaturated monocarboxylic acids and/or dicarboxylic acids of 3 to 5 carbon atoms and/or their .beta.-hydroxyalkyl esters and/or monoalkyl esters of the dicarboxylic acids,the amount of component (D) being from 20 to 50% by weight of that of component (A), and the sum of the percentages of A to E being 100, are particularly suitable for use as binders for gasoline-containing masonry paints and renders.

Abstract: A rubber composition comprising (A) 100 parts by weight of a rubber; (B) 5 to 50 parts by weight of a low molecular weight diene copolymer containing a glycidyl group-containing monomer or chloromethylstyrene, said copolymer (B) comprising 30% by weight or less of copolymerized styrene, and having an intrinsic viscosity of 0.2 to 1.3 dl/g as measured in toluene at 30.degree. C.; (C) a crosslinking agent reactive with the glycidyl group or the chloromethyl group in the copolymer (B) selected from (C.sub.I) a metallic oxide and (C.sub.II) an amine compound; and (D) 0.2 to 7 parts by weight, per 100 parts by weight of the rubber (A), of sulfur. This rubber composition has a good processability and can give a vulcanizate having excellent physical properties.

Abstract: Fire retarded compositions comprise elastomers derived from conjugated, hydrocarbon dienes in combination with a synergistic, three-component flame retardant system comprising (1) a chlorine- and/or bromine-containing fire-retardant additive, (2) alumina trihydrate and (3) an iron oxide.

Abstract: There is disclosed a radiation-sensitive composition and element comprising (a) a water-soluble polymer containing a quaternized nitrogen in a 5-membered ring and (b) a photoinitiator, and processes for preparing the polymer and for using the composition.

Abstract: An air drying paint composition comprising a chlorinated polymer selected from the group consisting of chlorinated polydiolefin rubbers and chlorinated polyolefins as at least one ingredient of a binder, said composition further comprising 5 to 100 parts by weight, per 100 parts by weight of the chlorinated polymer, of a cyclopentadiene resin having a softening point of 50.degree. to 160.degree. C. prepared by heat polymerization of 50 to 100% by weight of a cyclopentadiene monomer and 50 to 0% by weight of a comonomer copolymerizable with it.

Abstract: A process for the preparation of chlorinated aliphatic polymers wherein chlorine-free polymers are chlorinated by using gaseous chlorine in chlorinated hydrocarbons as solvents and the chlorinated aliphatic polymers are recovered from the chlorinating solution by steam distillation in which process from 15 to 50% by weight of a lacquer resin is added to the chlorinating solution before steam distillation. The chlorinated polymers contain less residual solvent.

Abstract: The processability and melt strength of halogen-containing polymers derived at least in part from vinyl chloride or vinylidene chloride are significantly improved using a conventional external lubricant in combination with an oxidized ethylene polymer exhibiting a melt viscosity of from 1,000 to about 60,000 centipoises at 140.degree. C. and an acid number of at least 5.

Abstract: Cross-linkable polymers are prepared by the introduction of the cross-linking agent to the main body of the polymer to be cross-linked in an extruder. This method reduces the "heat history" of the cross-linkable polymer and allows greater pre-extruder processing flexibility. Thus, mixing times can be reduced and the shelf life of the pre-extruded polymeric composition can be extended. After extrusion, the product may be cross-linked by heating.

Abstract: A pressure-sensitive adhesive composition having excellent tackiness and improved thermal resistance comprises (A) a low molecular weight polyisoprene, which may be obtained by polymerizing isoprene monomer with the aid of a lithium-type catalyst, said polyisoprene having a cis-1,4 content of not less than 75%, a viscosity average molecular weight of 8,000 to 77,000 and an Mw/Mn value (Mw: weight average molecular weight; Mn: number average molecular weight) of 1.0 to 2.7 and (B) an elastomer.

Abstract: A method of promoting peroxide initiated crosslinking of polar polymers whereby the solubility of peroxide vulcanizing agents in these materials is increased. Increased peroxide solubility and/or processibility is accomplished by blending certain ethylene copolymers with these highly polar polymers. The blending of ethylene copolymers with the polar polymers substantially reduces the viscosity of the latter polymers thereby enhancing their processibility.