Abstract: It is highly desirable to be able to cure rubbers quickly since the amount of energy required for the curing process is reduced and the number of articles that can be cured in a mold in a given time is increased. In other words, the cycle time needed to cure articles made from such a rubber is reduced and the throughput of a mold utilized in curing such a rubber is increased. Unfortunately, most attempts to accelerate the cure rate of rubber have resulted in the rubber having poor scorch safety. The present invention discloses a fast curing rubber blend having excellent scorch safety which comprises: (a) from 50 to 98 weight percent of at least one polydiene rubber, and (b) from 2 to 50 weight percent of at least one vinylpyridine copolymer comprised of repeat units which are derived from a diene monomer and vinylpyridine wherein from 1 to 75 weight percent of the repeat units in said copolymer are derived from vinylpyridine.

Abstract: There is disclosed a reaction product of a rosin acid and a polyfunctional compound having at least one functional group capable of reacting with a carboxylic acid functionality and another functional group having antidegradant properties.The reaction products of this invention can be used as antidegradants in polymeric compositions and lubricating oil compositions.

Abstract: It is often desirable to utilize accelerators in the sulfur vulcanization of unsaturated rubbers. In many cases a primary accelerator is used in combination with another accelerator, called a secondary accelerator or activator, which further increases the rate of vulcanization. It has been determined that compounds having the structural formula:NH.sub.2 --A--NH--(CH.sub.2).sub.x NH].sub.n A--NH.sub.2wherein x is 2 or 3, wherein n is an integer from 1 to 100, and wherein A represents an alkylene group containing from 1 to 20 carbons atoms, act as secondary accelerators in the vulcanization of unsaturated rubbers. For example, it has been determined that 4,7-diaza-decane-1,10-diamine is a particularly desirable secondary accelerator.

Abstract: It is often desirable to utilize accelerators in the sulfur vulcanization of unsaturated rubbers. In many cases a primary accelerator is used in combination with another accelerator, called a secondary accelerator or activator, which further increases the rate of vulcanization. It has been determined that compounds having the structural formula:NH.sub.2 --A[NH--(CH.sub.2).sub.x NH].sub.n A--NH.sub.2wherein x is 2 or 3, wherein n is an integer from 1 to 100, and wherein A represents an alkylene group containing from 1 to 20 carbon atoms, act as secondary accelerators in the vulcanization of unsaturated rubbers. For example, it has been determined that 4,7-diaza-decane-1,10-diamine is a particularly desirable secondary accelerator.

Abstract: The subject invention discloses the use of syndiotactic-1,2-polybutadiene in the supporting carcass and/or innerliner of a tire. The incorporation of syndiotactic-1,2-polybutadiene into rubber compositions which are utilized in the supporting carcass or innerliner of tires greatly improves the green strength of those compositions. The incorporation of syndiotactic-1,2-polybutadiene into halogenated butyl rubbers which are utilized as innerliner compositions also greatly improves the scorch safety of such compositions. The subject invention more specifically discloses a pneumatic rubber tire which comprises a circumferential rubber tread, a supporting carcass therefor, two spaced beads, two rubber sidewalls connecting said beads and an innerliner; wherein said supporting carcass is comprised of from 1 to 25 phr of syndiotactic-1,2-polybutadiene having a melting point which is within the range of 120.degree. C. to 190.degree. C.

Abstract: There is disclosed a reaction product of a rosin acid and a polyfunctional compound having at least one functional group capable of reacting with a carboxylic acid functionality and another functional group having antidegradant properties.The reaction products of this invention can be used as antidegradants in polymeric compositions and lubricating oil compositions.

Abstract: There is disclosed a method for adhering rubber to reinforcing materials which comprises embedding a textile fiber or metal reinforcing material in a vulcanizable rubber composition comprising rubber, a vulcanizing agent, reinforcement, a methylene donor, and a phenolic ester as a methylene acceptor.

Abstract: There is disclosed a rubbery composition comprising a blend of between 95/5 and 5/95 weight percent of (1) a rubbery interpolymer consisting of (a) at least 80 weight percent of at least one .alpha.-olefin containing from 5 to 10 carbon atoms and (b) up to 20 weight percent of a nonconjugated polyene containing from 5 to 30 carbon atoms with (2) a saturated polymer of an .alpha.-olefin oxide prepared from at least one monomer having the structure: ##STR1## wherein R.sub.1 and R.sub.2 are selected from the group consisting of hydrogen or a lower alkyl radical containing from 1 to 8 carbon atoms and R.sub.3 and R.sub.4 are selected from the group consisting of hydrogen, a lower alkyl radical containing from 1 to 8 carbon atoms and an alkoxyalkyl radical containing up to 12 carbon atoms, an aryl radical, a haloalkyl radical containing from 1 to 12 carbon atoms and in which R.sub.3 and R.sub.

Abstract: There are disclosed polymers which have nonionic surfactant moieties pendant to the polymeric backbone which exhibit activated sulfur vulcanization, a process for their preparation, and mixtures of polymeric cure activators and elastomers.

Abstract: The conventional processing of rubbers into shaped articles of manufacture normally include a compounding step. In this compounding step the rubber is mixed with fillers, curatives, and various other additives so as to obtain a homogeneous mixture. The relatively high viscosity of these raw materials makes it necessary to utilize heavy machinery, such as Banbury mixtures, which consume large amounts of energy in the mixing procedure.The present invention provides an improved process for the production of tack-free, pourable, filler containing powdered rubber. This powdered rubber can be compounded eliminating in whole or in part the need for heavy equipment which consumes high amounts of energy.

Abstract: The green strength of synthetic elastomers is improved by forming copolymers from at least one type of various synthetic elastomer forming monomers with a hydroxyl containing monomer having the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are either hydrogen or a methyl group and R.sub.4 is an alkyl group having 1-10 carbon atoms and A is a methylene or carbonyl group. The green strength is further improved if a small amount of a hydroxyl ester cross-linking agent is utilized.

Abstract: A pneumatic rubber tire having an integral innerliner comprising a compounded rubber composition comprised of a sulfur cured blend of a halobutyl rubber and an unsaturated copolymer of propylene oxide and copolymerizable monomer.

Abstract: There is disclosed the use of esters especially methyl esters of rosin acids as total or partial replacements for oil in rubber formulations. Vulcanizate properties, low temperature performance, and processibility are comparable when using either the rosin ester or an aromatic oil, however, the rosin ester extended rubber demonstrates improved abrasion resistance and flex resistance.

Abstract: There is disclosed the use of decarboxylated rosins as total or partial replacements for oil in rubber formulations. Vulcanizate properties, low temperature performance, and processibility are comparable when using either the decarboxylated rosins or an aromatic extending oil, however, the decarboxylated rosin extended rubber demonstrates improved abrasion resistance.

Abstract: There is disclosed a rubbery composition comprising a blend of between 95/5 and 5/95 weight percent of (1) a rubbery interpolymer consisting of (a) at least 80 weight percent of at least one .alpha.-olefin containing from 5 to 10 carbon atoms and (b) up to 20 weight percent of a nonconjugated polyene containing from 5 to 30 carbon atoms with (2) a saturated polymer of an .alpha.-olefin oxide prepared from at least one monomer having the structure: ##STR1## wherein R.sub.1 and R.sub.2 are selected from the group consisting of hydrogen or a lower alkyl radical containing from 1 to 8 carbon atoms and R.sub.3 and R.sub.4 are selected from the group consisting of hydrogen, a lower alkyl radical containing from 1 to 8 carbon atoms and an alkoxyalkyl radical containing up to 12 carbon atoms, an aryl radical, a haloalkyl radical containing from 1 to 12 carbon atoms and in which R.sub.3 and R.sub.

Abstract: A pneumatic rubber tire, and method of preparation, characterized by having a covulcanized, removable, rubber inner liner adhering to the inner surface of the tire, said inner liner comprised of a sulphur cured rubber admixture of (A) butyl rubber and (B) an ethylene/propylene/nonconjugated diene terpolymer. The information further relates to such pneumatic rubber tire in which its exposed inner surface is provided by removal of said inner liner. The information has a particular utility in providing a pneumatic rubber tire with a clean, exposed, inner surface.

Abstract: The present invention is an improved polymerization process which comprises polymerizing isoprene under solution polymerization conditions in a hydrocarbon solvent with a catalyst system comprising a mixture of titanium tetrachloride and a trialkylaluminum compound, wherein the polymerization is shortstopped with 4,7-diaza-decane-1,10-diamine.

Abstract: This invention reveals a process for the nonaqueous dispersion polymerization of butadiene monomer in a reaction mixture containing a liquid nonaqueous dispersion medium, the improvement which comprises carrying out the polymerization of the butadiene monomer in the presence of high cis-1,4-polyisoprene to produce very high cis-1,4-polybutadiene.

Abstract: There is disclosed a process for the regulation of the molecular weight of high cis polybutadiene prepared by polymerizing butadiene under solution polymerization conditions employing as the catalyst system a mixture of (a) organoaluminum compounds; (b) organonickel compounds; and (c) fluorine containing compounds; said polymerization being conducted in the presence of nonconjugated diolefins of the formula of the structure ##STR1## wherein R.sub.1 may be; --CH.sub.2 --; --C.sub.2 H.sub.4 --; --C.sub.3 H.sub.6 --; ##STR2## and R.sub.2 may be H, --CH.sub.3, --C.sub.2 H.sub.5 or --C.sub.3 H.sub.7 and R.sub.2 is trans to R.sub.1.

Abstract: There is disclosed a process for the production of tack-free, pourable, filler containing elastomer powder which comprises(a) dispersing a carbon black filler in water;(b) mixing the thus dispersed carbon black filler with an elastomer latex;(c) coagulating the thus produced mixture of elastomer latex and carbon black with an acid/alum solution;(d) partitioning the thus coagulated suspension with a coating resin; and(e) filtering, washing and drying of the resultant powder, the improvement comprising using as a coating resin a mixture of a styrene/butadiene resin and a styrene/.alpha.-methylstyrene or a polystyrene resin wherein the weight ratio of the styrene/butadiene resin to the styrene/.alpha.