Abstract: This disclosure provides a consolidated electric motor stator lamination for multiple enclosure types such that a single stator assembly can be used for different classifications of an electric motor. Each layer of the stator lamination includes external features that, when combined with the external features of the other layers in the lamination, can be adapted to conform the electric motor to one of a plurality of enclosure types. The external features include retaining features for one or more covers, fins, and a profile configured to accept cooling tubes. In various embodiments, a single consolidated stator lamination assembly can be adapted to provide a motor having at least two of an open-drip proof (ODP), a totally enclosed fan cooled (TEFC), or a totally enclosed water cooled (TEWC) enclosure classification.

Abstract: A method produces a polyamide having an extractable fraction of oligomer of from 2 to 10 percent. The method includes introducing a monomer into a reactor and polymerizing the monomer to form a first intermediate having an extractable fraction of oligomer of greater than 10 percent, wherein the oligomer is a compound of 2 to 20 units of the monomer. The method includes transferring the first intermediate from the reactor into an extractor and introducing water into the extractor to form a second intermediate having an extractable fraction of oligomer that is less than the extractable fraction of the first intermediate, wherein the water is introduced at a temperature of less than 100° C. and wherein the water includes 0.1 to 3.0 weight percent of a plasticizer. Moreover, the method includes transferring the second intermediate into a dryer and applying air at a temperature of less than 125° C.

Abstract: The present invention relates to a process for preparing polyamides, comprising a hydrolytic polymerization, a postpolymerization and an extraction.

Abstract: A method polymerizes a monomer to form a polyamide having a reagent incorporated therein. In the method, a masterbatch is formed that includes the reagent. The masterbatch and the monomer are introduced into a reactor, and the monomer is polymerized in the presence of the reagent to form the polyamide having the reagent incorporated therein. The monomer may be a caprolactam monomer that may be polymerized in a VK tube reactor to form polyamide 6 having at least one free acid site. The reagent may be present in an amount of from 1 to 10 parts by weight per 100 parts by weight of the masterbatch. Additionally, the masterbatch and caprolactam may be introduced into the top of the VK tube reactor.

Abstract: A method polymerizes a monomer to form a polyamide having a reagent incorporated therein. In the method, a masterbatch is formed that includes the reagent. The masterbatch and the monomer are introduced into a reactor, and the monomer is polymerized in the presence of the reagent to form the polyamide having the reagent incorporated therein. The monomer may be a caprolactam monomer that may be polymerized in a VK tube reactor to form polyamide 6 having at least one free acid site. The reagent may be present in an amount of from 1 to 10 parts by weight per 100 parts by weight of the masterbatch. Additionally, the masterbatch and caprolactam may be introduced into the top of the VK tube reactor.

Abstract: The present invention provides a polyamide resin composition and a method of preparing the composition. The composition includes a first polyamide resin, a second polyamide resin different from the first, a transition metal, and a lubricant. The first polyamide resin has an extractable fraction of nylon 6 oligomer at least one percent as determined by ISO 6427. The composition is optimized for relative viscosity, viscosity number, moisture content, and an amount of extractables.

Abstract: The present invention provides a polyamide resin composition and a method of preparing the composition. The composition includes a first polyamide resin, a second polyamide resin different from the first, a transition metal, and a lubricant. The first polyamide resin has an extractable fraction of nylon 6 oligomer at least one percent as determined by ISO 6427. The composition is optimized for relative viscosity, viscosity number, moisture content, and an amount of extractables.