Abstract: Provided herein are polymers, including polyureas, polyurethanes, and polyurea-polyurethane hybrids, made from an isocyanate, a secondary polyetheramine, a second amine, and optionally a polyol. The secondary polyetheramine may be used in combination with the second amine to modify other properties of the polymer, including its cure time and cost.

Abstract: Provided herein are polymers, including polyureas, polyurethanes, and polyurea-polyurethane hybrids, made from an isocyanate, a secondary polyetheramine, an aspartic ester amine, and optionally a polyol. The secondary polyetheramine may be used in combination with the aspartic ester amine to increase flexibility or modify other properties and lower cost of the final polymer product while maintaining a desirable cure time.

Abstract: A housing for a pressure switch is coupled to a pipeline. The housing has a tubular body with an explosion-proof enclosure attached to the body with a retainer sleeve inserted through an opening in the enclosure and threaded into the body to secure the enclosure to the body in an axial direction. The body of the housing may be coupled to the pipeline via an interstitial trim device. The body and trim are preferably coupled together using left-hand threads. The enclosure is further secured to the body by a pin that extends from the enclosure into a corresponding pin receptacle in the body. The pin opposes rotation of the enclosure with respect to the body and prevents attempts by field personnel to remove the pressure switch from a pipeline by simply turning the enclosure. This arrangement also avoids disruption of the calibration of micro-switch components contained within the enclosure.

Abstract: Provided herein are polyurea polymers made from an organic isocyanate and a polyamine component, wherein the polyamine component comprises a polyether polyamine in which the nitrogen atoms are secondary. The polyurea polymers of the invention are useful in a wide range of end-use applications and possess superior physical properties over polyurea polymers of the prior art. Methods for producing the polyurea polymers are also disclosed.

Abstract: Disclosed are derivatives of isophorone diamine exhibiting a synergistic relationship with other commonly employed chain extenders offerings enhanced efficacy with regard to slowing of the polyurea elastomer cure profile, and processes employing their use. According to the invention, extensions of the gel-free and tack-free times are more readily achieved at lower loading levels for these chain extender blends than are afforded through the sole use of the individual molecules.

Abstract: The present invention is concerned with cover assemblies for manually resetting pressure switches used on oil and gas pipelines. The cover assembly encloses a volume of space on the pressure switch that houses a reset switch which is activated by depressing a button located on top of the reset switch. The cover assembly has a housing with a rod or plunger extending through the housing. On the exterior end of the rod is a protective cap and on the interior is a flexible rubber hemispherical bumper. A spring disposed between the cap and the exterior side of the cover housing biases the bumper away from the button on the reset switch. In operation, the cap is pushed towards the housing causing the rod or plunger to advance towards and contact the reset switch button. The bumper deforms or balloons outward upon contact with the button so as to impart sufficient force to depress the button but not so much force so as to damage or break the reset switch itself.