Abstract: A repaired elastomer article having a cut or crack entirely therethrough. A treating agent is located about the cut portion on the inner surface of the article and an amine curable polymer or prepolymer layer resides over said treating agent. A cured elastomeric patch resides over said curable polymer. Since the amine curable polymer cures at ambient temperatures, the repair of the elastomer article can occur on site. The invention is especially useful in the repair of tires.

Abstract: It now has been found that uncured modified rubber compositions comprising mixtures of elastomers and a reinforcing filler can be prepared having improved properties.

Abstract: A repaired elastomer article having a cut or crack entirely therethrough. An interior cavity is located in the vicinity of the cut or crack and has a filler therein. A treating agent is located about the cut portion on the inner surface of the article and an amine curable polymer or prepolymer resides over said treating agent. A cured elastomeric patch resides over said amine curable polymer or prepolymer. Since the amine curable polymer or prepolymer cures at ambient temperatures, the repair of the elastomer article can occur in situ. The invention is especially useful in the repair of tires.

Abstract: A repaired elastomer article having a cut or crack entirely therethrough. A treating agent is located about the cut portion on the inner surface of the article and an amine curable polymer or prepolymer layer resides over said treating agent. A cured elastomeric patch resides over said curable polymer. Since the amine curable polymer cures at ambient temperatures, the repair of the elastomer article can occur on site. The invention is especially useful in the repair of tires.

Abstract: A repaired elastomer article has a hollow in a non-reinforced portion of the article. A cured preformed plug resides within the hollow and is adhered to the article through an amine curable polymer or prepolymer. The amine polymer or prepolymer is curable at ambient temperature. The preformed plug is made of a material which is compatible with the elastomer of the article. The preformed plug material desirably has a lower modulus than the elastomer of the article and hence exhibits good physical properties such as enhanced longevity of the repair, good wear and the like. Since the amine curable polymer or prepolymer cures at ambient temperatures, the repair of the elastomer article can occur in situ. The invention is especially useful in the repair of tires.

Abstract: Urethane elastomers are produced by reacting a prepolymer with a chain extender or cure agent in the presence of limited amounts of water without adverse effects on the physical properties of the cured polyurethane.

Abstract: A process for extracting rubber and/or resin from rubber containing plants such as guayule utilizing a monophase mixture of an organic polar solvent and a hydrocarbon solvent.

Abstract: A process for extracting resin and rubber from guayule plants utilizing a portion of recycled miscella and a fresh solvent system. An expression step is applied to the plants to enhance recovery of resin and rubber extract. The solvent system is preferably an organic polar solvent and a hydrocarbon solvent for rubber for simultaneous resin and rubber extraction containing at least 50% by weight of the hydrocarbon solvent. The process can be a one-step method wherein resin and rubber are generally simultaneously extracted.