Process and device for electric winding insulation by impregnation, and stabilized varnish without solvent usable therein
July 14, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3020262 3313747 3334110 3876618 Novel thermosetting resin and a process for producing same Process for producing electric windings Compositions for forming poly(oxazolidone/urethane) thermosets and products therefrom Selfcrosslinking heat-hardenable binder Thermosetting coating composition-III Modified poly(oxazolidone/urethane) compositions Patent #: 4504633 InventorAssigneeApplicationNo. 06/630598 filed on 07/13/1984US Classes:442/296, Mica paper layer156/53, Wrapping of sheet material (e.g., tape) about conductor and/or conductor assembly156/55, Plural spaced conductors174/120C, Coated or impregnated174/120R, Plural or impregnated layers174/121SR, Synthetic resin174/122G, Glass427/386, Epoxy or polyepoxide containing coating427/389.8, Fiberglass base427/407.3, Fiberglass base428/324, Mica428/422.8, Of polyisocyanurate525/528, Mixed with -N=C=X-containing reactant or polymer therefrom528/52, Material is organic nitrogen-containing compoud528/73Reactant contains at least one heterocyclic ringExaminersPrimary: Cannon, James C.Attorney, Agent or FirmInternational ClassesC08G 18/00 (20060101)H01B 3/30 (20060101) H01B 3/40 (20060101) Foreign Application Priority Data1983-07-13 FRAbstractProcess for insulating by impregnation an electric winding with isocyanurate and oxazolidone cycles resins, in which one wraps around the conductors a glass cloth and porous mica paper tape loaded with a quaternary ammonium salt catalyzing the condensation of the isocyanate and epoxy compounds into isocyanurate and oxazolidone cycles, one impregnates the tape with a varnish containing an isocyanate compound and a liquid epoxy resin, then one subjects the impregnated tape to a varnish polymerization thermal treatment. One uses as a quaternary ammonium salt a benzyl-trialkylammonium halide with an alkyl chain containing at the most 3 carbon atoms.Other References
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