Patents by Inventor Mark R. Zentner

Mark R. Zentner has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of making thermally curable wet-impregnated rovings
    Patent number: 4543777
    Abstract: Thermally curable wet-impregnated rovings are disclosed in which the fibers of the roving are impregnated with a liquid polyepoxide having dispersed therein a latent heat-activatable epoxy curing catalyst, such as dicyandiamide, the polyepoxide dispersion having a room temperature viscosity of from 2000 to 5000 centipoises and a tack of less than about 6 on a Thwing-Albert inkometer. The rovings are produced without organic solvent by passing a dry multifillament roving through an elevated temperature bath of the polyepoxide dispersion, this elevated temperature being insufficient to activate the curing catalyst and functioning to lower the viscosity to enable uniform impregnation. The wet rovings are stored in a supply package.
    Type: Grant
    Filed: February 10, 1981
    Date of Patent: October 1, 1985
    Assignee: DeSoto, Inc.
    Inventors: Mark R. Zentner, Orvid R. Cutler
  • Thermally curable wet-impregnated rovings
    Patent number: 4531354
    Abstract: Thermally curable wet-impregnated rovings in which the fibers of the roving are impregnated with liquid polyepoxides lacking polymerizable unsaturation and having dispersed therein a latent heat-activatable epoxy curing catalyst, such as dicyandiamide. The polyepoxide dispersion has a room temperature viscosity of from 2000 to 5000 centipoises and a tack of less than about 6 on a Thwing-Albert inkometer. The rovings are produced without organic solvent using an elevated temperature which is insufficient to activate the curing catalyst and which lowers the viscosity to enable uniform impregnation in the absence of excess impregnant. The wet rovings can be stored without running in a supply package which may be cop wound, and running is also resisted in a void-free wet fiber composite so that the wet composite can be wrapped and then heated to cure the same.
    Type: Grant
    Filed: February 9, 1984
    Date of Patent: July 30, 1985
    Assignee: DeSoto, Inc.
    Inventors: Mark R. Zentner, Orvid R. Cutler, Jr.
  • Aqueous emulsions, methods of making the same and impregnated rovings made from the emulsions
    Patent number: 4222918
    Abstract: Aqueous impregnating emulsions for the impregnation of fibrous rovings are provided in which water has emulsified therein particles of epoxy resin in compatible admixture with thermoplastic resin, and a curing agent for the epoxy resin is dispersed in the emulsion, the curing agent being nonreactive under ambient conditions, such as dicyandiamide. Polysulfone resins are preferably used by dissolving them in methylene chloride and then evaporating this solvent after the epoxy resin has been dissolved in. Polycarboxylic acid emulsifying agents provide superior properties in the cured product.
    Type: Grant
    Filed: March 19, 1979
    Date of Patent: September 16, 1980
    Assignee: DeSoto, Inc.
    Inventors: Mark R. Zentner, Edward P. Zahora, Angelo F. Leo