Patents Assigned to Sika Corporation USA
  • Patent number: 6068885
    Abstract: An epoxy sealer/healer formulation for sealing and strengthening cracked concrete comprising an epoxy resin, an amine and a dialkylene triamine-alkylene oxide adduct, where the formulation provides a modulus and/or compressive strength at least that of uncracked concrete and effective for penetrating a concrete crack at a rate of at least 10 mm/min for a crack 0.5 mm wide when applied by gravity feed. The epoxy sealer/healer preferably has a viscosity of less than 100 centipoise and a tack-free time of less than 12 hours. The epoxy sealer/healer is advantageous in being able to bond to moist concrete surfaces. A method of using the epoxy sealer/healer for sealing and restoring the strength of cracked concrete is also set forth.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: May 30, 2000
    Assignee: Sika Corporation USA
    Inventors: Stuart J. Hartman, Michael C. Coddington, David C. Elmendorf, Norman Blank
  • Patent number: 5962602
    Abstract: An epoxy sealer/healer formulation for sealing and strengthening cracked concrete comprising an epoxy resin, an amine and a dialkylene triamine-alkylene oxide adduct, where the formulation provides a modulus and/or compressive strength at least that of uncracked concrete and effective for penetrating a concrete crack at a rate of at least 10 mm/min for a crack 0.5 mm wide when applied by gravity feed. The epoxy sealer/healer preferably has a viscosity of less than 100 centipoise and a tack-free time of less than 12 hours. The epoxy sealer/healer is advantageous in being able to bond to moist concrete surfaces. A method of using the epoxy sealer/healer for sealing and restoring the strength of cracked concrete is also set forth.
    Type: Grant
    Filed: February 29, 1996
    Date of Patent: October 5, 1999
    Assignee: Sika Corporation USA
    Inventors: Stuart J. Hartman, Michael C. Coddington, David C. Elmendorf, Norman Blank