Patents Examined by D. Troung
  • Polyurethane foam product and process
    Patent number: 4992483
    Abstract: A process for preparing polyurethane foams comprising reacting polyol with polyfunctional isocyanate in the presence of an auxiliary blowing agent comprising 1 monofluoro 1,1 dichloroethane. The amount of auxiliary blowing agent used is from 60 to 80 wt % of the amount of conventional auxiliary blowing agent consisting of trichlorofluoromethane that would be required to obtain comparable foam density and either firmness or compressive strength.
    Type: Grant
    Filed: August 18, 1989
    Date of Patent: February 12, 1991
    Assignee: Du Pont Canada Inc.
    Inventor: Robert G. Sylvester