Abstract: A non-phenolic tackifier compound which includes starch and asphalt, and is substantially free of cross-linked fatty acids. Preferably, the tackifier compound further includes a hydrocarbon tackifying resin, and a binding resin composed of a styrene copolymer, or an ethylene copolymer.

Abstract: An additive for latex rubber compounds is provided, the additive comprising crosslinked fatty acid and preferably lightweight microcellular filler, preferably expanded perlite. The additive is prepared as an aqueous emulsion and increases tear resistance in latex rubber compounds.

Abstract: A rubber additive is provided, which comprises crosslinked fatty acid and starch, and preferably further comprises a carrier, preferably an asphalt carrier. The rubber additive increases tear resistance when added to a rubber compound.

Abstract: Vulcanizable tire innerliner compositions are described which are essentially free of halogen atoms or contain a reduced halogen content. The innerliners contain a saturated elastomeric interpolymer of a C.sub.4 -C.sub.7 isomonoolefin, e.g., isobutylene and a para-alkylstyrene e.g., para-methylstyrene, which contains benzylic ester functionality having the structure: ##STR1## wherein R.sub.2 and R.sub.3 are independently selected from hydrogen or C.sub.1 to C.sub.6 alkyl, and R.sub.4 is selected from hydrogen, C.sub.1, to C.sub.28 alkyl, aryl or C.sub.2 to C.sub.28 alkenyl.Innerliners of the invention provide excellent impermeability to air, heat aging properties and good adhesion to tire carcass stock required for tire innerliners, and are also essentially free of halogen or contain low halogen content thereby reducing environmental concerns occasioned by the incineration of used tires.

Abstract: This invention provides for curable and graft-cured polymer compositions prepared from a mixture comprising:a) an elastomeric copolymer containing from about 0.01 up to about 10 mole % of Y ester groups randomly distributed along and pendant to the elastomeric polymer chain, said Y ester groups having the structure: ##STR1## wherein R.sub.2 and R.sub.3 are independently selected from the group consisting of hydrogen and an alkyl group containing 1 to about 6 carbon atoms and R.sub.4 is selected from the group consisting of hydrogen, an alkyl group containing from 1 to about 28 carbon atoms, an aryl group and an alkenyl group containing from 2 to about 28 carbon atoms; andb) at least one free radically polymerizable monomer. The invention also provides for a process for preparing graft-cured polymer compositions comprising forming the above recited mixture of (a) and (b) and subjecting said mixture to free radical polymerization conditions. The Y ester groups pendant to the elastomeric polymer chain, e.g.

Abstract: A tire sidewall composition having improved properties is provided. The composition comprises a halogen-containing copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene, and an unsaturated rubber, such as natural rubber. Tires comprising the sidewalls are also provided.

Abstract: A composition suitable for use in producing a tire innerliner is provided. The composition comprises a halogen-containing copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene; carbon black, and a plasticizer oil. A vulcanized tire comprising an innerliner made from the composition is also provided.

Abstract: The invention is a multilayer tire sidewall having an outer layer prepared from a blend of isomonoolefin/para-alkylstyrene copolymer and general purpose rubbers. The inner layer comprises general purpose rubber. The resulting sidewall exhibit good ozone resistance and fatigue crack resistance as well as a reduction in staining and discloration.

Abstract: A composition suitable for use in producing a tire innerliner is provided. The composition comprises a halogencontaining copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a paraalkylstyrene; carbon black, and a plasticizer oil. A vulcanized tire comprising an innerliner made from the composition is also provided.

Abstract: A process for halogenating star-branched butyl rubber is provided wherein water and a wetting agent or wetting agent precursor are added to a solution comprising the star-branched butyl rubber, solid particles of branching agent and an organic solvent prior to the neutralization step to increase the rate of neutralization of the hydrogen halide by-product of the halogenation reaction.

Abstract: A hose composition is provided which comprises a halogen-containing copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene, fillers, rubber compounding additives and a curing agent. A hose comprising at least a portion made from this hose composition is also provided.

Abstract: Ozone resistant vulcanizable copolymers of isoolefins with non-conjugated dienes of the general formula: ##STR1## where R.sub.1 is ##STR2## and R.sub.2 is alkyl of 1 to 6 carbon atoms and vulcanizates thereof. The copolymers are prepared by polymerization in the presence of Lewis acids.

Abstract: A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching.

Abstract: A partially crosslinked, unsaturated elastomeric polymer of a C.sub.4 to C.sub.7 isomonoolefin and a C.sub.4 to C.sub.14 conjugated multiolefin is provided which has a low crosslink density. The partially crosslinked polymer is produced by curing an uncrosslinked unsaturated polymer having a low level of chemically bound halogen with a curing agent which reacts only with the halogen. Processes for preparing these partially crosslinked unsaturated polymers are also provided.

Abstract: A process for halogenating polymers by contacting a polymer either in solution or in bulk with a halogenating agent in the presence of an acid scavenger. Halogenated polymer, e.g., butyl rubber, with a particular structure is obtained and the product suffers less molecular weight loss. Combinations of acid scavengers can also be used and the scavenger can be dispersed in the polymer prior to halogenation and/or added to the reaction zone during halogenation.

Abstract: A partially crosslinked, unsaturated elastomeric polymer of a C.sub.4 to C.sub.7 isomonoolefin and a C.sub.4 to C.sub.14 conjugated multiolefin is provided which has a low crosslink density. The partially crosslinked polymer is produced by curing an uncrosslinked unsaturated polymer having a low level of chemically bound halogen with a curing agent which reacts only with the halogen. Processes for preparing these partially crosslinked unsaturated polymers are also provided.

Abstract: A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching.

Abstract: An improved halogenated butyl rubber wherein the polymer has a conjugated diene content of less than 0.25 mole % and a halogen content of at least 0.6 wt. %; at least 20 mole % of the halogen being in a primary allylic configuration.

Abstract: Improved halogenated butyl rubbers are prepared by isomerizing the polymers so that a significant mole fraction of the halogen is in the primary allylic position. The isomerization is carried out utilizing as a catalyst either a Friedel Crafts catalyst or HBr.

Abstract: A process for preparing a brominated butyl rubber high in Primary Allylic Bromine which comprises reacting the rubber in solution with elemental bromine at a temperature of about 65.degree. C. to about 130.degree. C. The process is preferably carried out under substantially anhydrous conditions.